diff --git a/libc/Android.mk b/libc/Android.mk
index 7b1aa99..51cef8a 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -9,7 +9,6 @@
 	unistd/abort.c \
 	unistd/alarm.c \
 	unistd/brk.c \
-	unistd/creat.c \
 	unistd/daemon.c \
 	unistd/eventfd.c \
 	unistd/exec.c \
@@ -328,13 +327,14 @@
 	netbsd/nameser/ns_netint.c \
 	netbsd/nameser/ns_print.c \
 	netbsd/nameser/ns_samedomain.c \
-	regex/regcomp.c \
-	regex/regerror.c \
-	regex/regexec.c \
-	regex/regfree.c \
 
 libc_upstream_netbsd_src_files := \
+	upstream-netbsd/libc/compat-43/creat.c \
 	upstream-netbsd/libc/gen/nice.c \
+	upstream-netbsd/libc/regex/regcomp.c \
+	upstream-netbsd/libc/regex/regerror.c \
+	upstream-netbsd/libc/regex/regexec.c \
+	upstream-netbsd/libc/regex/regfree.c \
 	upstream-netbsd/libc/stdlib/tdelete.c \
 	upstream-netbsd/libc/stdlib/tfind.c \
 	upstream-netbsd/libc/stdlib/tsearch.c \
diff --git a/libc/NOTICE b/libc/NOTICE
index 14a826a..8bf4978 100644
--- a/libc/NOTICE
+++ b/libc/NOTICE
@@ -2211,7 +2211,6 @@
 
 -------------------------------------------------------------------
 
-Copyright (c) 1992, 1993, 1994 Henry Spencer.
 Copyright (c) 1992, 1993, 1994
    The Regents of the University of California.  All rights reserved.
 
@@ -2244,6 +2243,41 @@
 
 -------------------------------------------------------------------
 
+Copyright (c) 1992, 1993, 1994 Henry Spencer.
+
+This code is derived from software contributed to Berkeley by
+Henry Spencer.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. All advertising materials mentioning features or use of this software
+   must display the following acknowledgement:
+   This product includes software developed by the University of
+   California, Berkeley and its contributors.
+4. Neither the name of the University nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
+
+-------------------------------------------------------------------
+
 Copyright (c) 1993
      The Regents of the University of California.  All rights reserved.
 
diff --git a/libc/regex/cclass.h b/libc/regex/cclass.h
deleted file mode 100644
index d105491..0000000
--- a/libc/regex/cclass.h
+++ /dev/null
@@ -1,68 +0,0 @@
-/*	$OpenBSD: cclass.h,v 1.5 2003/06/02 20:18:36 millert Exp $	*/
-
-/*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
- * Copyright (c) 1992, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Henry Spencer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)cclass.h	8.3 (Berkeley) 3/20/94
- */
-
-/* character-class table */
-static const struct cclass {
-	char *name;
-	char *chars;
-	char *multis;
-} cclasses[] = {
-	{ "alnum",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\
-0123456789",				""} ,
-	{ "alpha",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",
-					""} ,
-	{ "blank",	" \t",		""} ,
-	{ "cntrl",	"\007\b\t\n\v\f\r\1\2\3\4\5\6\16\17\20\21\22\23\24\
-\25\26\27\30\31\32\33\34\35\36\37\177",	""} ,
-	{ "digit",	"0123456789",	""} ,
-	{ "graph",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\
-0123456789!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~",
-					""} ,
-	{ "lower",	"abcdefghijklmnopqrstuvwxyz",
-					""} ,
-	{ "print",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\
-0123456789!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ ",
-					""} ,
-	{ "punct",	"!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~",
-					""} ,
-	{ "space",	"\t\n\v\f\r ",	""} ,
-	{ "upper",	"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
-					""} ,
-	{ "xdigit",	"0123456789ABCDEFabcdef",
-					""} ,
-	{ NULL,		0,		"" }
-};
diff --git a/libc/regex/regerror.c b/libc/regex/regerror.c
deleted file mode 100644
index 838ec8f..0000000
--- a/libc/regex/regerror.c
+++ /dev/null
@@ -1,130 +0,0 @@
-/*	$OpenBSD: regerror.c,v 1.13 2005/08/05 13:03:00 espie Exp $ */
-/*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
- * Copyright (c) 1992, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Henry Spencer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)regerror.c	8.4 (Berkeley) 3/20/94
- */
-
-#include <sys/types.h>
-#include <stdio.h>
-#include <string.h>
-#include <ctype.h>
-#include <limits.h>
-#include <stdlib.h>
-#include <regex.h>
-
-#include "utils.h"
-
-static char *regatoi(const regex_t *, char *, int);
-
-static const struct rerr {
-	int code;
-	char *name;
-	char *explain;
-} rerrs[] = {
-	{ REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match" },
-	{ REG_BADPAT,	"REG_BADPAT",	"invalid regular expression" },
-	{ REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element" },
-	{ REG_ECTYPE,	"REG_ECTYPE",	"invalid character class" },
-	{ REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)" },
-	{ REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number" },
-	{ REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced" },
-	{ REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced" },
-	{ REG_EBRACE,	"REG_EBRACE",	"braces not balanced" },
-	{ REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)" },
-	{ REG_ERANGE,	"REG_ERANGE",	"invalid character range" },
-	{ REG_ESPACE,	"REG_ESPACE",	"out of memory" },
-	{ REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid" },
-	{ REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression" },
-	{ REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug" },
-	{ REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine" },
-	{ 0,		"",		"*** unknown regexp error code ***" }
-};
-
-/*
- - regerror - the interface to error numbers
- = extern size_t regerror(int, const regex_t *, char *, size_t);
- */
-/* ARGSUSED */
-size_t
-regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
-{
-	const struct rerr *r;
-	size_t len;
-	int target = errcode &~ REG_ITOA;
-	char *s;
-	char convbuf[50];
-
-	if (errcode == REG_ATOI)
-		s = regatoi(preg, convbuf, sizeof convbuf);
-	else {
-		for (r = rerrs; r->code != 0; r++)
-			if (r->code == target)
-				break;
-
-		if (errcode&REG_ITOA) {
-			if (r->code != 0) {
-				assert(strlen(r->name) < sizeof(convbuf));
-				(void) strlcpy(convbuf, r->name, sizeof convbuf);
-			} else
-				(void)snprintf(convbuf, sizeof convbuf,
-				    "REG_0x%x", target);
-			s = convbuf;
-		} else
-			s = r->explain;
-	}
-
-	len = strlen(s) + 1;
-	if (errbuf_size > 0) {
-		strlcpy(errbuf, s, errbuf_size);
-	}
-
-	return(len);
-}
-
-/*
- - regatoi - internal routine to implement REG_ATOI
- */
-static char *
-regatoi(const regex_t *preg, char *localbuf, int localbufsize)
-{
-	const struct rerr *r;
-
-	for (r = rerrs; r->code != 0; r++)
-		if (strcmp(r->name, preg->re_endp) == 0)
-			break;
-	if (r->code == 0)
-		return("0");
-
-	(void)snprintf(localbuf, localbufsize, "%d", r->code);
-	return(localbuf);
-}
diff --git a/libc/regex/regex2.h b/libc/regex/regex2.h
deleted file mode 100644
index 15e15bc..0000000
--- a/libc/regex/regex2.h
+++ /dev/null
@@ -1,157 +0,0 @@
-/*	$OpenBSD: regex2.h,v 1.7 2004/11/30 17:04:23 otto Exp $	*/
-
-/*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
- * Copyright (c) 1992, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Henry Spencer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)regex2.h	8.4 (Berkeley) 3/20/94
- */
-
-/*
- * internals of regex_t
- */
-#define	MAGIC1	((('r'^0200)<<8) | 'e')
-
-/*
- * The internal representation is a *strip*, a sequence of
- * operators ending with an endmarker.  (Some terminology etc. is a
- * historical relic of earlier versions which used multiple strips.)
- * Certain oddities in the representation are there to permit running
- * the machinery backwards; in particular, any deviation from sequential
- * flow must be marked at both its source and its destination.  Some
- * fine points:
- *
- * - OPLUS_ and O_PLUS are *inside* the loop they create.
- * - OQUEST_ and O_QUEST are *outside* the bypass they create.
- * - OCH_ and O_CH are *outside* the multi-way branch they create, while
- *   OOR1 and OOR2 are respectively the end and the beginning of one of
- *   the branches.  Note that there is an implicit OOR2 following OCH_
- *   and an implicit OOR1 preceding O_CH.
- *
- * In state representations, an operator's bit is on to signify a state
- * immediately *preceding* "execution" of that operator.
- */
-typedef unsigned long sop;	/* strip operator */
-typedef long sopno;
-#define	OPRMASK	0xf8000000LU
-#define	OPDMASK	0x07ffffffLU
-#define	OPSHIFT	((unsigned)27)
-#define	OP(n)	((n)&OPRMASK)
-#define	OPND(n)	((n)&OPDMASK)
-#define	SOP(op, opnd)	((op)|(opnd))
-/* operators			   meaning	operand			*/
-/*						(back, fwd are offsets)	*/
-#define	OEND	(1LU<<OPSHIFT)	/* endmarker	-			*/
-#define	OCHAR	(2LU<<OPSHIFT)	/* character	unsigned char		*/
-#define	OBOL	(3LU<<OPSHIFT)	/* left anchor	-			*/
-#define	OEOL	(4LU<<OPSHIFT)	/* right anchor	-			*/
-#define	OANY	(5LU<<OPSHIFT)	/* .		-			*/
-#define	OANYOF	(6LU<<OPSHIFT)	/* [...]	set number		*/
-#define	OBACK_	(7LU<<OPSHIFT)	/* begin \d	paren number		*/
-#define	O_BACK	(8LU<<OPSHIFT)	/* end \d	paren number		*/
-#define	OPLUS_	(9LU<<OPSHIFT)	/* + prefix	fwd to suffix		*/
-#define	O_PLUS	(10LU<<OPSHIFT)	/* + suffix	back to prefix		*/
-#define	OQUEST_	(11LU<<OPSHIFT)	/* ? prefix	fwd to suffix		*/
-#define	O_QUEST	(12LU<<OPSHIFT)	/* ? suffix	back to prefix		*/
-#define	OLPAREN	(13LU<<OPSHIFT)	/* (		fwd to )		*/
-#define	ORPAREN	(14LU<<OPSHIFT)	/* )		back to (		*/
-#define	OCH_	(15LU<<OPSHIFT)	/* begin choice	fwd to OOR2		*/
-#define	OOR1	(16LU<<OPSHIFT)	/* | pt. 1	back to OOR1 or OCH_	*/
-#define	OOR2	(17LU<<OPSHIFT)	/* | pt. 2	fwd to OOR2 or O_CH	*/
-#define	O_CH	(18LU<<OPSHIFT)	/* end choice	back to OOR1		*/
-#define	OBOW	(19LU<<OPSHIFT)	/* begin word	-			*/
-#define	OEOW	(20LU<<OPSHIFT)	/* end word	-			*/
-
-/*
- * Structure for [] character-set representation.  Character sets are
- * done as bit vectors, grouped 8 to a byte vector for compactness.
- * The individual set therefore has both a pointer to the byte vector
- * and a mask to pick out the relevant bit of each byte.  A hash code
- * simplifies testing whether two sets could be identical.
- *
- * This will get trickier for multicharacter collating elements.  As
- * preliminary hooks for dealing with such things, we also carry along
- * a string of multi-character elements, and decide the size of the
- * vectors at run time.
- */
-typedef struct {
-	uch *ptr;		/* -> uch [csetsize] */
-	uch mask;		/* bit within array */
-	uch hash;		/* hash code */
-	size_t smultis;
-	char *multis;		/* -> char[smulti]  ab\0cd\0ef\0\0 */
-} cset;
-/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
-#define	CHadd(cs, c)	((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
-#define	CHsub(cs, c)	((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
-#define	CHIN(cs, c)	((cs)->ptr[(uch)(c)] & (cs)->mask)
-#define	MCadd(p, cs, cp)	mcadd(p, cs, cp)	/* regcomp() internal fns */
-#define	MCsub(p, cs, cp)	mcsub(p, cs, cp)
-#define	MCin(p, cs, cp)	mcin(p, cs, cp)
-
-/* stuff for character categories */
-typedef unsigned char cat_t;
-
-/*
- * main compiled-expression structure
- */
-struct re_guts {
-	int magic;
-#		define	MAGIC2	((('R'^0200)<<8)|'E')
-	sop *strip;		/* malloced area for strip */
-	int csetsize;		/* number of bits in a cset vector */
-	int ncsets;		/* number of csets in use */
-	cset *sets;		/* -> cset [ncsets] */
-	uch *setbits;		/* -> uch[csetsize][ncsets/CHAR_BIT] */
-	int cflags;		/* copy of regcomp() cflags argument */
-	sopno nstates;		/* = number of sops */
-	sopno firststate;	/* the initial OEND (normally 0) */
-	sopno laststate;	/* the final OEND */
-	int iflags;		/* internal flags */
-#		define	USEBOL	01	/* used ^ */
-#		define	USEEOL	02	/* used $ */
-#		define	BAD	04	/* something wrong */
-	int nbol;		/* number of ^ used */
-	int neol;		/* number of $ used */
-	int ncategories;	/* how many character categories */
-	cat_t *categories;	/* ->catspace[-CHAR_MIN] */
-	char *must;		/* match must contain this string */
-	int mlen;		/* length of must */
-	size_t nsub;		/* copy of re_nsub */
-	int backrefs;		/* does it use back references? */
-	sopno nplus;		/* how deep does it nest +s? */
-	/* catspace must be last */
-	cat_t catspace[1];	/* actually [NC] */
-};
-
-/* misc utilities */
-#define	OUT	(CHAR_MAX+1)	/* a non-character value */
-#define	ISWORD(c)	(isalnum(c) || (c) == '_')
diff --git a/libc/regex/regexec.c b/libc/regex/regexec.c
deleted file mode 100644
index 6feed3b..0000000
--- a/libc/regex/regexec.c
+++ /dev/null
@@ -1,160 +0,0 @@
-/*	$OpenBSD: regexec.c,v 1.11 2005/08/05 13:03:00 espie Exp $ */
-/*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
- * Copyright (c) 1992, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Henry Spencer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)regexec.c	8.3 (Berkeley) 3/20/94
- */
-
-/*
- * the outer shell of regexec()
- *
- * This file includes engine.c *twice*, after muchos fiddling with the
- * macros that code uses.  This lets the same code operate on two different
- * representations for state sets.
- */
-#include <sys/types.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <limits.h>
-#include <ctype.h>
-#include <regex.h>
-
-#include "utils.h"
-#include "regex2.h"
-
-/* macros for manipulating states, small version */
-#define	states	long
-#define	states1	states		/* for later use in regexec() decision */
-#define	CLEAR(v)	((v) = 0)
-#define	SET0(v, n)	((v) &= ~((unsigned long)1 << (n)))
-#define	SET1(v, n)	((v) |= (unsigned long)1 << (n))
-#define	ISSET(v, n)	(((v) & ((unsigned long)1 << (n))) != 0)
-#define	ASSIGN(d, s)	((d) = (s))
-#define	EQ(a, b)	((a) == (b))
-#define	STATEVARS	long dummy	/* dummy version */
-#define	STATESETUP(m, n)	/* nothing */
-#define	STATETEARDOWN(m)	/* nothing */
-#define	SETUP(v)	((v) = 0)
-#define	onestate	long
-#define	INIT(o, n)	((o) = (unsigned long)1 << (n))
-#define	INC(o)		((o) <<= 1)
-#define	ISSTATEIN(v, o)	(((v) & (o)) != 0)
-/* some abbreviations; note that some of these know variable names! */
-/* do "if I'm here, I can also be there" etc without branches */
-#define	FWD(dst, src, n)	((dst) |= ((unsigned long)(src)&(here)) << (n))
-#define	BACK(dst, src, n)	((dst) |= ((unsigned long)(src)&(here)) >> (n))
-#define	ISSETBACK(v, n)		(((v) & ((unsigned long)here >> (n))) != 0)
-/* function names */
-#define SNAMES			/* engine.c looks after details */
-
-#include "engine.c"
-
-/* now undo things */
-#undef	states
-#undef	CLEAR
-#undef	SET0
-#undef	SET1
-#undef	ISSET
-#undef	ASSIGN
-#undef	EQ
-#undef	STATEVARS
-#undef	STATESETUP
-#undef	STATETEARDOWN
-#undef	SETUP
-#undef	onestate
-#undef	INIT
-#undef	INC
-#undef	ISSTATEIN
-#undef	FWD
-#undef	BACK
-#undef	ISSETBACK
-#undef	SNAMES
-
-/* macros for manipulating states, large version */
-#define	states	char *
-#define	CLEAR(v)	memset(v, 0, m->g->nstates)
-#define	SET0(v, n)	((v)[n] = 0)
-#define	SET1(v, n)	((v)[n] = 1)
-#define	ISSET(v, n)	((v)[n])
-#define	ASSIGN(d, s)	memcpy(d, s, m->g->nstates)
-#define	EQ(a, b)	(memcmp(a, b, m->g->nstates) == 0)
-#define	STATEVARS	long vn; char *space
-#define	STATESETUP(m, nv)	{ (m)->space = malloc((nv)*(m)->g->nstates); \
-				if ((m)->space == NULL) return(REG_ESPACE); \
-				(m)->vn = 0; }
-#define	STATETEARDOWN(m)	{ free((m)->space); }
-#define	SETUP(v)	((v) = &m->space[m->vn++ * m->g->nstates])
-#define	onestate	long
-#define	INIT(o, n)	((o) = (n))
-#define	INC(o)	((o)++)
-#define	ISSTATEIN(v, o)	((v)[o])
-/* some abbreviations; note that some of these know variable names! */
-/* do "if I'm here, I can also be there" etc without branches */
-#define	FWD(dst, src, n)	((dst)[here+(n)] |= (src)[here])
-#define	BACK(dst, src, n)	((dst)[here-(n)] |= (src)[here])
-#define	ISSETBACK(v, n)	((v)[here - (n)])
-/* function names */
-#define	LNAMES			/* flag */
-
-#include "engine.c"
-
-/*
- - regexec - interface for matching
- *
- * We put this here so we can exploit knowledge of the state representation
- * when choosing which matcher to call.  Also, by this point the matchers
- * have been prototyped.
- */
-int				/* 0 success, REG_NOMATCH failure */
-regexec(const regex_t *preg, const char *string, size_t nmatch,
-    regmatch_t pmatch[], int eflags)
-{
-	struct re_guts *g = preg->re_g;
-#ifdef REDEBUG
-#	define	GOODFLAGS(f)	(f)
-#else
-#	define	GOODFLAGS(f)	((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
-#endif
-
-	if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
-		return(REG_BADPAT);
-	assert(!(g->iflags&BAD));
-	if (g->iflags&BAD)		/* backstop for no-debug case */
-		return(REG_BADPAT);
-	eflags = GOODFLAGS(eflags);
-
-	if (g->nstates <= (int)(CHAR_BIT*sizeof(states1)) && !(eflags&REG_LARGE))
-		return(smatcher(g, (char *)string, nmatch, pmatch, eflags));
-	else
-		return(lmatcher(g, (char *)string, nmatch, pmatch, eflags));
-}
diff --git a/libc/regex/regfree.c b/libc/regex/regfree.c
deleted file mode 100644
index a57eba3..0000000
--- a/libc/regex/regfree.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/*	$OpenBSD: regfree.c,v 1.7 2005/08/05 13:03:00 espie Exp $ */
-/*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
- * Copyright (c) 1992, 1993, 1994
- *	The Regents of the University of California.  All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Henry Spencer.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)regfree.c	8.3 (Berkeley) 3/20/94
- */
-
-#include <sys/types.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <regex.h>
-
-#include "utils.h"
-#include "regex2.h"
-
-/*
- - regfree - free everything
- */
-void
-regfree(regex_t *preg)
-{
-	struct re_guts *g;
-
-	if (preg->re_magic != MAGIC1)	/* oops */
-		return;			/* nice to complain, but hard */
-
-	g = preg->re_g;
-	if (g == NULL || g->magic != MAGIC2)	/* oops again */
-		return;
-	preg->re_magic = 0;		/* mark it invalid */
-	g->magic = 0;			/* mark it invalid */
-
-	if (g->strip != NULL)
-		free((char *)g->strip);
-	if (g->sets != NULL)
-		free((char *)g->sets);
-	if (g->setbits != NULL)
-		free((char *)g->setbits);
-	if (g->must != NULL)
-		free(g->must);
-	free((char *)g);
-}
diff --git a/libc/unistd/creat.c b/libc/unistd/creat.c
deleted file mode 100644
index 1b14465..0000000
--- a/libc/unistd/creat.c
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-#include <unistd.h>
-#include <fcntl.h>
-
-int creat(const char*  pathname, mode_t  mode)
-{
-    return open(pathname, O_WRONLY|O_TRUNC|O_CREAT, mode);
-}
diff --git a/libc/regex/utils.h b/libc/upstream-netbsd/libc/compat-43/creat.c
similarity index 69%
rename from libc/regex/utils.h
rename to libc/upstream-netbsd/libc/compat-43/creat.c
index 3e184fc..9560bea 100644
--- a/libc/regex/utils.h
+++ b/libc/upstream-netbsd/libc/compat-43/creat.c
@@ -1,13 +1,9 @@
-/*	$OpenBSD: utils.h,v 1.4 2003/06/02 20:18:36 millert Exp $	*/
+/*	$NetBSD: creat.c,v 1.10 2003/08/07 16:42:39 agc Exp $	*/
 
-/*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
- * Copyright (c) 1992, 1993, 1994
+/*
+ * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
- * This code is derived from software contributed to Berkeley by
- * Henry Spencer.
- *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -31,25 +27,26 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- *
- *	@(#)utils.h	8.3 (Berkeley) 3/20/94
  */
 
-/* utility definitions */
-#define	DUPMAX		255
-#define	INFINITY	(DUPMAX + 1)
-#define	NC		(CHAR_MAX - CHAR_MIN + 1)
-typedef unsigned char uch;
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)creat.c	8.1 (Berkeley) 6/2/93";
+#else
+__RCSID("$NetBSD: creat.c,v 1.10 2003/08/07 16:42:39 agc Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
 
-/* switch off assertions (if not already off) if no REDEBUG */
-#ifndef REDEBUG
-#ifndef NDEBUG
-#define	NDEBUG	/* no assertions please */
-#endif
-#endif
 #include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
 
-/* for old systems with bcopy() but no memmove() */
-#ifdef USEBCOPY
-#define	memmove(d, s, c)	bcopy(s, d, c)
-#endif
+int
+creat(const char *path, mode_t mode)
+{
+
+	_DIAGASSERT(path != NULL);
+
+	return(open(path, O_WRONLY|O_CREAT|O_TRUNC, mode));
+}
diff --git a/libc/upstream-netbsd/libc/regex/cclass.h b/libc/upstream-netbsd/libc/regex/cclass.h
new file mode 100644
index 0000000..3ab2ccb
--- /dev/null
+++ b/libc/upstream-netbsd/libc/regex/cclass.h
@@ -0,0 +1,104 @@
+/*	$NetBSD: cclass.h,v 1.7 2003/08/07 16:43:19 agc Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)cclass.h	8.3 (Berkeley) 3/20/94
+ */
+
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)cclass.h	8.3 (Berkeley) 3/20/94
+ */
+
+/* character-class table */
+static const struct cclass {
+	const char *name;
+	const char *chars;
+	const char *multis;
+} cclasses[] = {
+	{ "alnum",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\
+0123456789",				"" },
+	{ "alpha",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",
+					"" },
+	{ "blank",	" \t",		"" },
+	{ "cntrl",	"\007\b\t\n\v\f\r\1\2\3\4\5\6\16\17\20\21\22\23\24\
+\25\26\27\30\31\32\33\34\35\36\37\177",	"" },
+	{ "digit",	"0123456789",	"" },
+	{ "graph",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\
+0123456789!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~",
+					"" },
+	{ "lower",	"abcdefghijklmnopqrstuvwxyz",
+					"" },
+	{ "print",	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\
+0123456789!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ ",
+					"" },
+	{ "punct",	"!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~",
+					"" },
+	{ "space",	"\t\n\v\f\r ",	"" },
+	{ "upper",	"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
+					"" },
+	{ "xdigit",	"0123456789ABCDEFabcdef",
+					"" },
+	{ NULL,		0,		"" }
+};
diff --git a/libc/regex/cname.h b/libc/upstream-netbsd/libc/regex/cname.h
similarity index 67%
rename from libc/regex/cname.h
rename to libc/upstream-netbsd/libc/regex/cname.h
index b674b68..4b9ef39 100644
--- a/libc/regex/cname.h
+++ b/libc/upstream-netbsd/libc/regex/cname.h
@@ -1,7 +1,6 @@
-/*	$OpenBSD: cname.h,v 1.5 2003/06/02 20:18:36 millert Exp $	*/
+/*	$NetBSD: cname.h,v 1.7 2003/08/07 16:43:19 agc Exp $	*/
 
 /*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
  * Copyright (c) 1992, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
@@ -35,9 +34,46 @@
  *	@(#)cname.h	8.3 (Berkeley) 3/20/94
  */
 
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)cname.h	8.3 (Berkeley) 3/20/94
+ */
+
 /* character-name table */
 static const struct cname {
-	char *name;
+	const char *name;
 	char code;
 } cnames[] = {
 	{ "NUL",			'\0' },
@@ -135,5 +171,5 @@
 	{ "right-curly-bracket",	'}' },
 	{ "tilde",			'~' },
 	{ "DEL",			'\177' },
-	{ NULL,				0 }
+	{ NULL,				0 },
 };
diff --git a/libc/regex/engine.c b/libc/upstream-netbsd/libc/regex/engine.c
similarity index 69%
rename from libc/regex/engine.c
rename to libc/upstream-netbsd/libc/regex/engine.c
index eae6ff2..2a800d4 100644
--- a/libc/regex/engine.c
+++ b/libc/upstream-netbsd/libc/regex/engine.c
@@ -1,7 +1,6 @@
-/*	$OpenBSD: engine.c,v 1.15 2005/08/05 13:03:00 espie Exp $	*/
+/*	$NetBSD: engine.c,v 1.24 2012/03/13 21:13:42 christos Exp $	*/
 
 /*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
  * Copyright (c) 1992, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
@@ -35,6 +34,43 @@
  *	@(#)engine.c	8.5 (Berkeley) 3/20/94
  */
 
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)engine.c	8.5 (Berkeley) 3/20/94
+ */
+
 /*
  * The matching engine and friends.  This file is #included by regexec.c
  * after suitable #defines of a variety of macros used herein, so that
@@ -72,11 +108,11 @@
 	struct re_guts *g;
 	int eflags;
 	regmatch_t *pmatch;	/* [nsub+1] (0 element unused) */
-	char *offp;		/* offsets work from here */
-	char *beginp;		/* start of string -- virtual NUL precedes */
-	char *endp;		/* end of string -- virtual NUL here */
-	char *coldp;		/* can be no match starting before here */
-	char **lastpos;		/* [nplus+1] */
+	const char *offp;	/* offsets work from here */
+	const char *beginp;	/* start of string -- virtual NUL precedes */
+	const char *endp;	/* end of string -- virtual NUL here */
+	const char *coldp;	/* can be no match starting before here */
+	const char **lastpos;	/* [nplus+1] */
 	STATEVARS;
 	states st;		/* current states */
 	states fresh;		/* states for a fresh start */
@@ -84,13 +120,18 @@
 	states empty;		/* empty set of states */
 };
 
-static int matcher(struct re_guts *, char *, size_t, regmatch_t[], int);
-static char *dissect(struct match *, char *, char *, sopno, sopno);
-static char *backref(struct match *, char *, char *, sopno, sopno, sopno, int);
-static char *fast(struct match *, char *, char *, sopno, sopno);
-static char *slow(struct match *, char *, char *, sopno, sopno);
-static states step(struct re_guts *, sopno, sopno, states, int, states);
-#define MAX_RECURSION	100
+/* ========= begin header generated by ./mkh ========= */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* === engine.c === */
+static int matcher(struct re_guts *g, const char *string, size_t nmatch, regmatch_t pmatch[], int eflags);
+static const char *dissect(struct match *m, const char *start, const char *stop, sopno startst, sopno stopst);
+static const char *backref(struct match *m, const char *start, const char *stop, sopno startst, sopno stopst, sopno lev);
+static const char *fast(struct match *m, const char *start, const char *stop, sopno startst, sopno stopst);
+static const char *slow(struct match *m, const char *start, const char *stop, sopno startst, sopno stopst);
+static states step(struct re_guts *g, sopno start, sopno stop, states bef, int ch, states aft);
 #define	BOL	(OUT+1)
 #define	EOL	(BOL+1)
 #define	BOLEOL	(BOL+2)
@@ -101,19 +142,24 @@
 #define	NONCHAR(c)	((c) > CHAR_MAX)
 #define	NNONCHAR	(CODEMAX-CHAR_MAX)
 #ifdef REDEBUG
-static void print(struct match *, char *, states, int, FILE *);
+static void print(struct match *m, char *caption, states st, int ch, FILE *d);
 #endif
 #ifdef REDEBUG
-static void at(struct match *, char *, char *, char *, sopno, sopno);
+static void at(struct match *m, char *title, char *start, char *stop, sopno startst, sopno stopst);
 #endif
 #ifdef REDEBUG
-static char *pchar(int);
+static char *pchar(int ch);
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+/* ========= end header generated by ./mkh ========= */
+
 #ifdef REDEBUG
 #define	SP(t, s, c)	print(m, t, s, c, stdout)
 #define	AT(t, p1, p2, s1, s2)	at(m, t, p1, p2, s1, s2)
-#define	NOTE(str)	{ if (m->eflags&REG_TRACE) (void)printf("=%s\n", (str)); }
+#define	NOTE(str)	{ if (m->eflags&REG_TRACE) printf("=%s\n", (str)); }
 static int nope = 0;
 #else
 #define	SP(t, s, c)	/* nothing */
@@ -123,27 +169,39 @@
 
 /*
  - matcher - the actual matching engine
+ == static int matcher(struct re_guts *g, char *string, \
+ ==	size_t nmatch, regmatch_t pmatch[], int eflags);
  */
 static int			/* 0 success, REG_NOMATCH failure */
-matcher(struct re_guts *g, char *string, size_t nmatch, regmatch_t pmatch[],
+matcher(
+    struct re_guts *g,
+    const char *string,
+    size_t nmatch,
+    regmatch_t pmatch[],
     int eflags)
 {
-	char *endp;
-	int i;
+	const char *endp;
+	size_t i;
 	struct match mv;
 	struct match *m = &mv;
-	char *dp;
+	const char *dp;
 	const sopno gf = g->firststate+1;	/* +1 for OEND */
 	const sopno gl = g->laststate;
-	char *start;
-	char *stop;
+	const char *start;
+	const char *stop;
+	int error = 0;
+
+	_DIAGASSERT(g != NULL);
+	_DIAGASSERT(string != NULL);
+	/* pmatch checked below */
 
 	/* simplify the situation where possible */
 	if (g->cflags&REG_NOSUB)
 		nmatch = 0;
 	if (eflags&REG_STARTEND) {
-		start = string + pmatch[0].rm_so;
-		stop = string + pmatch[0].rm_eo;
+		_DIAGASSERT(pmatch != NULL);
+		start = string + (size_t)pmatch[0].rm_so;
+		stop = string + (size_t)pmatch[0].rm_eo;
 	} else {
 		start = string;
 		stop = start + strlen(start);
@@ -154,8 +212,8 @@
 	/* prescreening; this does wonders for this rather slow code */
 	if (g->must != NULL) {
 		for (dp = start; dp < stop; dp++)
-			if (*dp == g->must[0] && stop - dp >= g->mlen &&
-				memcmp(dp, g->must, (size_t)g->mlen) == 0)
+			if (*dp == g->must[0] && (size_t)(stop - dp) >= g->mlen &&
+				memcmp(dp, g->must, g->mlen) == 0)
 				break;
 		if (dp == stop)		/* we didn't find g->must */
 			return(REG_NOMATCH);
@@ -180,10 +238,8 @@
 	for (;;) {
 		endp = fast(m, start, stop, gf, gl);
 		if (endp == NULL) {		/* a miss */
-			free(m->pmatch);
-			free(m->lastpos);
-			STATETEARDOWN(m);
-			return(REG_NOMATCH);
+			error = REG_NOMATCH;
+			goto done;
 		}
 		if (nmatch == 0 && !g->backrefs)
 			break;		/* no further info needed */
@@ -206,25 +262,24 @@
 			m->pmatch = (regmatch_t *)malloc((m->g->nsub + 1) *
 							sizeof(regmatch_t));
 		if (m->pmatch == NULL) {
-			STATETEARDOWN(m);
-			return(REG_ESPACE);
+			error = REG_ESPACE;
+			goto done;
 		}
-		for (i = 1; i <= (int)m->g->nsub; i++)
-			m->pmatch[i].rm_so = m->pmatch[i].rm_eo = -1;
+		for (i = 1; i <= m->g->nsub; i++)
+			m->pmatch[i].rm_so = m->pmatch[i].rm_eo = (regoff_t)-1;
 		if (!g->backrefs && !(m->eflags&REG_BACKR)) {
 			NOTE("dissecting");
 			dp = dissect(m, m->coldp, endp, gf, gl);
 		} else {
 			if (g->nplus > 0 && m->lastpos == NULL)
-				m->lastpos = (char **)malloc((g->nplus+1) *
-							sizeof(char *));
+				m->lastpos = malloc((g->nplus+1) *
+							sizeof(const char *));
 			if (g->nplus > 0 && m->lastpos == NULL) {
-				free(m->pmatch);
-				STATETEARDOWN(m);
-				return(REG_ESPACE);
+				error = REG_ESPACE;
+				goto done;
 			}
 			NOTE("backref dissect");
-			dp = backref(m, m->coldp, endp, gf, gl, (sopno)0, 0);
+			dp = backref(m, m->coldp, endp, gf, gl, (sopno)0);
 		}
 		if (dp != NULL)
 			break;
@@ -242,12 +297,12 @@
 			/* try it on a shorter possibility */
 #ifndef NDEBUG
 			for (i = 1; i <= m->g->nsub; i++) {
-				assert(m->pmatch[i].rm_so == -1);
-				assert(m->pmatch[i].rm_eo == -1);
+				assert(m->pmatch[i].rm_so == (regoff_t)-1);
+				assert(m->pmatch[i].rm_eo == (regoff_t)-1);
 			}
 #endif
 			NOTE("backoff dissect");
-			dp = backref(m, m->coldp, endp, gf, gl, (sopno)0, 0);
+			dp = backref(m, m->coldp, endp, gf, gl, (sopno)0);
 		}
 		assert(dp == NULL || dp == endp);
 		if (dp != NULL)		/* found a shorter one */
@@ -255,54 +310,72 @@
 
 		/* despite initial appearances, there is no match here */
 		NOTE("false alarm");
-		if (m->coldp == stop)
-			break;
 		start = m->coldp + 1;	/* recycle starting later */
+		assert(start <= stop);
 	}
 
 	/* fill in the details if requested */
 	if (nmatch > 0) {
+		_DIAGASSERT(pmatch != NULL);
 		pmatch[0].rm_so = m->coldp - m->offp;
 		pmatch[0].rm_eo = endp - m->offp;
 	}
 	if (nmatch > 1) {
 		assert(m->pmatch != NULL);
-		for (i = 1; i < (ssize_t)nmatch; i++)
-			if (i <= (int)m->g->nsub)
+		for (i = 1; i < nmatch; i++)
+			if (i <= m->g->nsub)
 				pmatch[i] = m->pmatch[i];
 			else {
-				pmatch[i].rm_so = -1;
-				pmatch[i].rm_eo = -1;
+				pmatch[i].rm_so = (regoff_t)-1;
+				pmatch[i].rm_eo = (regoff_t)-1;
 			}
 	}
 
-	if (m->pmatch != NULL)
-		free((char *)m->pmatch);
-	if (m->lastpos != NULL)
-		free((char *)m->lastpos);
+done:
+	if (m->pmatch != NULL) {
+		free(m->pmatch);
+		m->pmatch = NULL;
+	}
+	if (m->lastpos != NULL) {
+		free(m->lastpos);
+		m->lastpos = NULL;
+	}
 	STATETEARDOWN(m);
-	return(0);
+	return error;
 }
 
 /*
  - dissect - figure out what matched what, no back references
+ == static const char *dissect(struct match *m, const char *start, \
+ ==	const char *stop, sopno startst, sopno stopst);
  */
-static char *			/* == stop (success) always */
-dissect(struct match *m, char *start, char *stop, sopno startst, sopno stopst)
+static const char *			/* == stop (success) always */
+dissect(
+    struct match *m,
+    const char *start,
+    const char *stop,
+    sopno startst,
+    sopno stopst)
 {
 	int i;
 	sopno ss;	/* start sop of current subRE */
 	sopno es;	/* end sop of current subRE */
-	char *sp;	/* start of string matched by it */
-	char *stp;	/* string matched by it cannot pass here */
-	char *rest;	/* start of rest of string */
-	char *tail;	/* string unmatched by rest of RE */
+	const char *sp;	/* start of string matched by it */
+	const char *stp; /* string matched by it cannot pass here */
+	const char *rest; /* start of rest of string */
+	const char *tail; /* string unmatched by rest of RE */
 	sopno ssub;	/* start sop of subsubRE */
 	sopno esub;	/* end sop of subsubRE */
-	char *ssp;	/* start of string matched by subsubRE */
-	char *sep;	/* end of string matched by subsubRE */
-	char *oldssp;	/* previous ssp */
-	char *dp;
+	const char *ssp; /* start of string matched by subsubRE */
+	const char *sep; /* end of string matched by subsubRE */
+	const char *oldssp; /* previous ssp */
+#ifndef NDEBUG
+	const char *dp;
+#endif
+
+	_DIAGASSERT(m != NULL);
+	_DIAGASSERT(start != NULL);
+	_DIAGASSERT(stop != NULL);
 
 	AT("diss", start, stop, startst, stopst);
 	sp = start;
@@ -361,7 +434,12 @@
 			esub = es - 1;
 			/* did innards match? */
 			if (slow(m, sp, rest, ssub, esub) != NULL) {
-				dp = dissect(m, sp, rest, ssub, esub);
+#ifdef NDEBUG
+				(void)
+#else
+				dp = 
+#endif
+				    dissect(m, sp, rest, ssub, esub);
 				assert(dp == rest);
 			} else		/* no */
 				assert(sp == rest);
@@ -399,7 +477,12 @@
 			}
 			assert(sep == rest);	/* must exhaust substring */
 			assert(slow(m, ssp, sep, ssub, esub) == rest);
-			dp = dissect(m, ssp, sep, ssub, esub);
+#ifdef NDEBUG
+			(void)
+#else
+			dp =
+#endif
+			    dissect(m, ssp, sep, ssub, esub);
 			assert(dp == sep);
 			sp = rest;
 			break;
@@ -434,7 +517,12 @@
 				else
 					assert(OP(m->g->strip[esub]) == O_CH);
 			}
-			dp = dissect(m, sp, rest, ssub, esub);
+#ifdef NDEBUG
+			(void)
+#else
+			dp =
+#endif
+			    dissect(m, sp, rest, ssub, esub);
 			assert(dp == rest);
 			sp = rest;
 			break;
@@ -467,24 +555,35 @@
 
 /*
  - backref - figure out what matched what, figuring in back references
+ == static const char *backref(struct match *m, const char *start, \
+ ==	const char *stop, sopno startst, sopno stopst, sopno lev);
  */
-static char *			/* == stop (success) or NULL (failure) */
-backref(struct match *m, char *start, char *stop, sopno startst, sopno stopst,
-    sopno lev, int rec)			/* PLUS nesting level */
+static const char *		/* == stop (success) or NULL (failure) */
+backref(
+    struct match *m,
+    const char *start,
+    const char *stop,
+    sopno startst,
+    sopno stopst,
+    sopno lev)			/* PLUS nesting level */
 {
 	int i;
 	sopno ss;	/* start sop of current subRE */
-	char *sp;	/* start of string matched by it */
+	const char *sp;	/* start of string matched by it */
 	sopno ssub;	/* start sop of subsubRE */
 	sopno esub;	/* end sop of subsubRE */
-	char *ssp;	/* start of string matched by subsubRE */
-	char *dp;
+	const char *ssp; /* start of string matched by subsubRE */
+	const char *dp;
 	size_t len;
 	int hard;
 	sop s;
 	regoff_t offsave;
 	cset *cs;
 
+	_DIAGASSERT(m != NULL);
+	_DIAGASSERT(start != NULL);
+	_DIAGASSERT(stop != NULL);
+
 	AT("back", start, stop, startst, stopst);
 	sp = start;
 
@@ -572,51 +671,50 @@
 	case OBACK_:		/* the vilest depths */
 		i = OPND(s);
 		assert(0 < i && i <= m->g->nsub);
-		if (m->pmatch[i].rm_eo == -1)
+		if (m->pmatch[i].rm_eo == (regoff_t)-1)
 			return(NULL);
-		assert(m->pmatch[i].rm_so != -1);
-		len = m->pmatch[i].rm_eo - m->pmatch[i].rm_so;
-		if (len == 0 && rec++ > MAX_RECURSION)
+		assert(m->pmatch[i].rm_so != (regoff_t)-1);
+		len = (size_t)(m->pmatch[i].rm_eo - m->pmatch[i].rm_so);
+		if (len == 0)
 			return(NULL);
 		assert(stop - m->beginp >= len);
 		if (sp > stop - len)
 			return(NULL);	/* not enough left to match */
-		ssp = m->offp + m->pmatch[i].rm_so;
+		ssp = m->offp + (size_t)m->pmatch[i].rm_so;
 		if (memcmp(sp, ssp, len) != 0)
 			return(NULL);
 		while (m->g->strip[ss] != SOP(O_BACK, i))
 			ss++;
-		return(backref(m, sp+len, stop, ss+1, stopst, lev, rec));
-		break;
+		return(backref(m, sp+len, stop, ss+1, stopst, lev));
+
 	case OQUEST_:		/* to null or not */
-		dp = backref(m, sp, stop, ss+1, stopst, lev, rec);
+		dp = backref(m, sp, stop, ss+1, stopst, lev);
 		if (dp != NULL)
 			return(dp);	/* not */
-		return(backref(m, sp, stop, ss+OPND(s)+1, stopst, lev, rec));
-		break;
+		return(backref(m, sp, stop, ss+OPND(s)+1, stopst, lev));
+
 	case OPLUS_:
 		assert(m->lastpos != NULL);
 		assert(lev+1 <= m->g->nplus);
 		m->lastpos[lev+1] = sp;
-		return(backref(m, sp, stop, ss+1, stopst, lev+1, rec));
-		break;
+		return(backref(m, sp, stop, ss+1, stopst, lev+1));
+
 	case O_PLUS:
 		if (sp == m->lastpos[lev])	/* last pass matched null */
-			return(backref(m, sp, stop, ss+1, stopst, lev-1, rec));
+			return(backref(m, sp, stop, ss+1, stopst, lev-1));
 		/* try another pass */
 		m->lastpos[lev] = sp;
-		dp = backref(m, sp, stop, ss-OPND(s)+1, stopst, lev, rec);
+		dp = backref(m, sp, stop, ss-OPND(s)+1, stopst, lev);
 		if (dp == NULL)
-			return(backref(m, sp, stop, ss+1, stopst, lev-1, rec));
-		else
-			return(dp);
-		break;
+			dp = backref(m, sp, stop, ss+1, stopst, lev-1);
+		return(dp);
+
 	case OCH_:		/* find the right one, if any */
 		ssub = ss + 1;
 		esub = ss + OPND(s) - 1;
 		assert(OP(m->g->strip[esub]) == OOR1);
 		for (;;) {	/* find first matching branch */
-			dp = backref(m, sp, stop, ssub, esub, lev, rec);
+			dp = backref(m, sp, stop, ssub, esub, lev);
 			if (dp != NULL)
 				return(dp);
 			/* that one missed, try next one */
@@ -631,29 +729,29 @@
 			else
 				assert(OP(m->g->strip[esub]) == O_CH);
 		}
-		break;
+
 	case OLPAREN:		/* must undo assignment if rest fails */
 		i = OPND(s);
 		assert(0 < i && i <= m->g->nsub);
 		offsave = m->pmatch[i].rm_so;
 		m->pmatch[i].rm_so = sp - m->offp;
-		dp = backref(m, sp, stop, ss+1, stopst, lev, rec);
+		dp = backref(m, sp, stop, ss+1, stopst, lev);
 		if (dp != NULL)
 			return(dp);
 		m->pmatch[i].rm_so = offsave;
 		return(NULL);
-		break;
+
 	case ORPAREN:		/* must undo assignment if rest fails */
 		i = OPND(s);
 		assert(0 < i && i <= m->g->nsub);
 		offsave = m->pmatch[i].rm_eo;
 		m->pmatch[i].rm_eo = sp - m->offp;
-		dp = backref(m, sp, stop, ss+1, stopst, lev, rec);
+		dp = backref(m, sp, stop, ss+1, stopst, lev);
 		if (dp != NULL)
 			return(dp);
 		m->pmatch[i].rm_eo = offsave;
 		return(NULL);
-		break;
+
 	default:		/* uh oh */
 		assert(nope);
 		break;
@@ -662,24 +760,35 @@
 	/* "can't happen" */
 	assert(nope);
 	/* NOTREACHED */
-	return 0;
+	return NULL;
 }
 
 /*
  - fast - step through the string at top speed
+ == static const char *fast(struct match *m, const char *start, \
+ ==	const char *stop, sopno startst, sopno stopst);
  */
-static char *			/* where tentative match ended, or NULL */
-fast(struct match *m, char *start, char *stop, sopno startst, sopno stopst)
+static const char *		/* where tentative match ended, or NULL */
+fast(
+    struct match *m,
+    const char *start,
+    const char *stop,
+    sopno startst,
+    sopno stopst)
 {
 	states st = m->st;
 	states fresh = m->fresh;
 	states tmp = m->tmp;
-	char *p = start;
+	const char *p = start;
 	int c = (start == m->beginp) ? OUT : *(start-1);
 	int lastc;	/* previous c */
 	int flagch;
-	int i;
-	char *coldp;	/* last p after which no match was underway */
+	size_t i;
+	const char *coldp; /* last p after which no match was underway */
+
+	_DIAGASSERT(m != NULL);
+	_DIAGASSERT(start != NULL);
+	_DIAGASSERT(stop != NULL);
 
 	CLEAR(st);
 	SET1(st, startst);
@@ -751,19 +860,30 @@
 
 /*
  - slow - step through the string more deliberately
+ == static const char *slow(struct match *m, const char *start, \
+ ==	const char *stop, sopno startst, sopno stopst);
  */
-static char *			/* where it ended */
-slow(struct match *m, char *start, char *stop, sopno startst, sopno stopst)
+static const char *			/* where it ended */
+slow(
+    struct match *m,
+    const char *start,
+    const char *stop,
+    sopno startst,
+    sopno stopst)
 {
 	states st = m->st;
 	states empty = m->empty;
 	states tmp = m->tmp;
-	char *p = start;
+	const char *p = start;
 	int c = (start == m->beginp) ? OUT : *(start-1);
 	int lastc;	/* previous c */
 	int flagch;
-	int i;
-	char *matchp;	/* last p at which a match ended */
+	size_t i;
+	const char *matchp;	/* last p at which a match ended */
+
+	_DIAGASSERT(m != NULL);
+	_DIAGASSERT(start != NULL);
+	_DIAGASSERT(stop != NULL);
 
 	AT("slow", start, stop, startst, stopst);
 	CLEAR(st);
@@ -831,9 +951,21 @@
 
 /*
  - step - map set of states reachable before char to set reachable after
+ == static states step(struct re_guts *g, sopno start, sopno stop, \
+ ==	states bef, int ch, states aft);
+ == #define	BOL	(OUT+1)
+ == #define	EOL	(BOL+1)
+ == #define	BOLEOL	(BOL+2)
+ == #define	NOTHING	(BOL+3)
+ == #define	BOW	(BOL+4)
+ == #define	EOW	(BOL+5)
+ == #define	CODEMAX	(BOL+5)		// highest code used
+ == #define	NONCHAR(c)	((c) > CHAR_MAX)
+ == #define	NNONCHAR	(CODEMAX-CHAR_MAX)
  */
 static states
-step(struct re_guts *g,
+step(
+    struct re_guts *g,
     sopno start,		/* start state within strip */
     sopno stop,			/* state after stop state within strip */
     states bef,			/* states reachable before */
@@ -847,6 +979,8 @@
 	sopno look;
 	int i;
 
+	_DIAGASSERT(g != NULL);
+
 	for (pc = start, INIT(here, pc); pc != stop; pc++, INC(here)) {
 		s = g->strip[pc];
 		switch (OP(s)) {
@@ -948,47 +1082,79 @@
 #ifdef REDEBUG
 /*
  - print - print a set of states
+ == #ifdef REDEBUG
+ == static void print(struct match *m, char *caption, states st, \
+ ==	int ch, FILE *d);
+ == #endif
  */
 static void
-print(struct match *m, char *caption, states st, int ch, FILE *d)
+print(
+    struct match *m,
+    char *caption,
+    states st,
+    int ch,
+    FILE *d)
 {
 	struct re_guts *g = m->g;
 	int i;
 	int first = 1;
 
+	_DIAGASSERT(m != NULL);
+	_DIAGASSERT(caption != NULL);
+
 	if (!(m->eflags&REG_TRACE))
 		return;
 
-	(void)fprintf(d, "%s", caption);
+	_DIAGASSERT(d != NULL);
+
+	fprintf(d, "%s", caption);
 	if (ch != '\0')
-		(void)fprintf(d, " %s", pchar(ch));
+		fprintf(d, " %s", pchar(ch));
 	for (i = 0; i < g->nstates; i++)
 		if (ISSET(st, i)) {
-			(void)fprintf(d, "%s%d", (first) ? "\t" : ", ", i);
+			fprintf(d, "%s%d", (first) ? "\t" : ", ", i);
 			first = 0;
 		}
-	(void)fprintf(d, "\n");
+	fprintf(d, "\n");
 }
 
 /* 
  - at - print current situation
+ == #ifdef REDEBUG
+ == static void at(struct match *m, char *title, char *start, char *stop, \
+ ==						sopno startst, sopno stopst);
+ == #endif
  */
 static void
-at(struct match *m, char *title, char *start, char *stop, sopno startst,
+at(
+    struct match *m,
+    char *title,
+    char *start,
+    char *stop,
+    sopno startst,
     sopno stopst)
 {
+
+	_DIAGASSERT(m != NULL);
+	_DIAGASSERT(title != NULL);
+	_DIAGASSERT(start != NULL);
+	_DIAGASSERT(stop != NULL);
+
 	if (!(m->eflags&REG_TRACE))
 		return;
 
-	(void)printf("%s %s-", title, pchar(*start));
-	(void)printf("%s ", pchar(*stop));
-	(void)printf("%ld-%ld\n", (long)startst, (long)stopst);
+	printf("%s %s-", title, pchar(*start));
+	printf("%s ", pchar(*stop));
+	printf("%ld-%ld\n", (long)startst, (long)stopst);
 }
 
 #ifndef PCHARDONE
 #define	PCHARDONE	/* never again */
 /*
  - pchar - make a character printable
+ == #ifdef REDEBUG
+ == static char *pchar(int ch);
+ == #endif
  *
  * Is this identical to regchar() over in debug.c?  Well, yes.  But a
  * duplicate here avoids having a debugging-capable regexec.o tied to
@@ -996,7 +1162,8 @@
  * the non-debug compilation anyway, so it doesn't matter much.
  */
 static char *			/* -> representation */
-pchar(int ch)
+pchar(
+    int ch)
 {
 	static char pbuf[10];
 
diff --git a/libc/regex/regcomp.c b/libc/upstream-netbsd/libc/regex/regcomp.c
similarity index 61%
rename from libc/regex/regcomp.c
rename to libc/upstream-netbsd/libc/regex/regcomp.c
index 19f4790..2644a22 100644
--- a/libc/regex/regcomp.c
+++ b/libc/upstream-netbsd/libc/regex/regcomp.c
@@ -1,6 +1,6 @@
-/*	$OpenBSD: regcomp.c,v 1.19 2008/02/23 08:13:07 otto Exp $ */
+/*	$NetBSD: regcomp.c,v 1.33 2012/03/13 21:13:43 christos Exp $	*/
+
 /*-
- * Copyright (c) 1992, 1993, 1994 Henry Spencer.
  * Copyright (c) 1992, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
@@ -34,14 +34,67 @@
  *	@(#)regcomp.c	8.5 (Berkeley) 3/20/94
  */
 
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regcomp.c	8.5 (Berkeley) 3/20/94
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)regcomp.c	8.5 (Berkeley) 3/20/94";
+#else
+__RCSID("$NetBSD: regcomp.c,v 1.33 2012/03/13 21:13:43 christos Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
 #include <sys/types.h>
-#include <stdio.h>
-#include <string.h>
+
+#include <assert.h>
 #include <ctype.h>
 #include <limits.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <regex.h>
 
+#ifdef __weak_alias
+__weak_alias(regcomp,_regcomp)
+#endif
+
 #include "utils.h"
 #include "regex2.h"
 
@@ -53,56 +106,72 @@
  * other clumsinesses
  */
 struct parse {
-	char *next;		/* next character in RE */
-	char *end;		/* end of string (-> NUL normally) */
+	const char *next;	/* next character in RE */
+	const char *end;	/* end of string (-> NUL normally) */
 	int error;		/* has an error been seen? */
 	sop *strip;		/* malloced strip */
 	sopno ssize;		/* malloced strip size (allocated) */
 	sopno slen;		/* malloced strip length (used) */
-	int ncsalloc;		/* number of csets allocated */
+	size_t ncsalloc;	/* number of csets allocated */
 	struct re_guts *g;
 #	define	NPAREN	10	/* we need to remember () 1-9 for back refs */
 	sopno pbegin[NPAREN];	/* -> ( ([0] unused) */
 	sopno pend[NPAREN];	/* -> ) ([0] unused) */
 };
 
-static void p_ere(struct parse *, int);
-static void p_ere_exp(struct parse *);
-static void p_str(struct parse *);
-static void p_bre(struct parse *, int, int);
-static int p_simp_re(struct parse *, int);
-static int p_count(struct parse *);
-static void p_bracket(struct parse *);
-static void p_b_term(struct parse *, cset *);
-static void p_b_cclass(struct parse *, cset *);
-static void p_b_eclass(struct parse *, cset *);
-static char p_b_symbol(struct parse *);
-static char p_b_coll_elem(struct parse *, int);
-static char othercase(int);
-static void bothcases(struct parse *, int);
-static void ordinary(struct parse *, int);
-static void nonnewline(struct parse *);
-static void repeat(struct parse *, sopno, int, int);
-static int seterr(struct parse *, int);
-static cset *allocset(struct parse *);
-static void freeset(struct parse *, cset *);
-static int freezeset(struct parse *, cset *);
-static int firstch(struct parse *, cset *);
-static int nch(struct parse *, cset *);
-static void mcadd(struct parse *, cset *, char *);
-static void mcinvert(struct parse *, cset *);
-static void mccase(struct parse *, cset *);
-static int isinsets(struct re_guts *, int);
-static int samesets(struct re_guts *, int, int);
-static void categorize(struct parse *, struct re_guts *);
-static sopno dupl(struct parse *, sopno, sopno);
-static void doemit(struct parse *, sop, size_t);
-static void doinsert(struct parse *, sop, size_t, sopno);
-static void dofwd(struct parse *, sopno, sop);
-static void enlarge(struct parse *, sopno);
-static void stripsnug(struct parse *, struct re_guts *);
-static void findmust(struct parse *, struct re_guts *);
-static sopno pluscount(struct parse *, struct re_guts *);
+/* ========= begin header generated by ./mkh ========= */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* === regcomp.c === */
+static void p_ere(struct parse *p, int stop, size_t reclimit);
+static void p_ere_exp(struct parse *p, size_t reclimit);
+static void p_str(struct parse *p);
+static void p_bre(struct parse *p, int end1, int end2, size_t reclimit);
+static int p_simp_re(struct parse *p, int starordinary, size_t reclimit);
+static int p_count(struct parse *p);
+static void p_bracket(struct parse *p);
+static void p_b_term(struct parse *p, cset *cs);
+static void p_b_cclass(struct parse *p, cset *cs);
+static void p_b_eclass(struct parse *p, cset *cs);
+static char p_b_symbol(struct parse *p);
+static char p_b_coll_elem(struct parse *p, int endc);
+static int othercase(int ch);
+static void bothcases(struct parse *p, int ch);
+static void ordinary(struct parse *p, int ch);
+static void nonnewline(struct parse *p);
+static void repeat(struct parse *p, sopno start, int from, int to, size_t reclimit);
+static int seterr(struct parse *p, int e);
+static cset *allocset(struct parse *p);
+static void freeset(struct parse *p, cset *cs);
+static sopno freezeset(struct parse *p, cset *cs);
+static int firstch(struct parse *p, cset *cs);
+static int nch(struct parse *p, cset *cs);
+static void mcadd(struct parse *p, cset *cs, const char *cp);
+#if 0
+static void mcsub(cset *cs, char *cp);
+static int mcin(cset *cs, char *cp);
+static char *mcfind(cset *cs, char *cp);
+#endif
+static void mcinvert(struct parse *p, cset *cs);
+static void mccase(struct parse *p, cset *cs);
+static int isinsets(struct re_guts *g, int c);
+static int samesets(struct re_guts *g, int c1, int c2);
+static void categorize(struct parse *p, struct re_guts *g);
+static sopno dupl(struct parse *p, sopno start, sopno finish);
+static void doemit(struct parse *p, sop op, sopno opnd);
+static void doinsert(struct parse *p, sop op, sopno opnd, sopno pos);
+static void dofwd(struct parse *p, sopno pos, sopno value);
+static int enlarge(struct parse *p, sopno size);
+static void stripsnug(struct parse *p, struct re_guts *g);
+static void findmust(struct parse *p, struct re_guts *g);
+static sopno pluscount(struct parse *p, struct re_guts *g);
+
+#ifdef __cplusplus
+}
+#endif
+/* ========= end header generated by ./mkh ========= */
 
 static char nuls[10];		/* place to point scanner in event of error */
 
@@ -123,11 +192,11 @@
 #define	NEXTn(n)	(p->next += (n))
 #define	GETNEXT()	(*p->next++)
 #define	SETERROR(e)	seterr(p, (e))
-#define	REQUIRE(co, e)	((co) || SETERROR(e))
+#define	REQUIRE(co, e)	(void) ((co) || SETERROR(e))
 #define	MUSTSEE(c, e)	(REQUIRE(MORE() && PEEK() == (c), e))
-#define	MUSTEAT(c, e)	(REQUIRE(MORE() && GETNEXT() == (c), e))
+#define	MUSTEAT(c, e)	(void) (REQUIRE(MORE() && GETNEXT() == (c), e))
 #define	MUSTNOTSEE(c, e)	(REQUIRE(!MORE() || PEEK() != (c), e))
-#define	EMIT(op, sopnd)	doemit(p, (sop)(op), (size_t)(sopnd))
+#define	EMIT(op, sopnd)	doemit(p, (sop)(op), sopnd)
 #define	INSERT(op, pos)	doinsert(p, (sop)(op), HERE()-(pos)+1, pos)
 #define	AHEAD(pos)		dofwd(p, pos, HERE()-(pos))
 #define	ASTERN(sop, pos)	EMIT(sop, HERE()-pos)
@@ -142,11 +211,30 @@
 #define	never	0		/* some <assert.h>s have bugs too */
 #endif
 
+#define	MEMLIMIT	0x8000000
+#define MEMSIZE(p) \
+	((p)->ncsalloc / CHAR_BIT * (p)->g->csetsize + \
+	(p)->ncsalloc * sizeof(cset) + \
+	(p)->ssize * sizeof(sop))
+#define	RECLIMIT	256
+
 /*
  - regcomp - interface for parser and compilation
+ = extern int regcomp(regex_t *, const char *, int);
+ = #define	REG_BASIC	0000
+ = #define	REG_EXTENDED	0001
+ = #define	REG_ICASE	0002
+ = #define	REG_NOSUB	0004
+ = #define	REG_NEWLINE	0010
+ = #define	REG_NOSPEC	0020
+ = #define	REG_PEND	0040
+ = #define	REG_DUMP	0200
  */
 int				/* 0 success, otherwise REG_something */
-regcomp(regex_t *preg, const char *pattern, int cflags)
+regcomp(
+    regex_t *preg,
+    const char *pattern,
+    int cflags)
 {
 	struct parse pa;
 	struct re_guts *g;
@@ -159,6 +247,9 @@
 #	define	GOODFLAGS(f)	((f)&~REG_DUMP)
 #endif
 
+	_DIAGASSERT(preg != NULL);
+	_DIAGASSERT(pattern != NULL);
+
 	cflags = GOODFLAGS(cflags);
 	if ((cflags&REG_EXTENDED) && (cflags&REG_NOSPEC))
 		return(REG_INVARG);
@@ -168,7 +259,7 @@
 			return(REG_INVARG);
 		len = preg->re_endp - pattern;
 	} else
-		len = strlen((char *)pattern);
+		len = strlen(pattern);
 
 	/* do the mallocs early so failure handling is easy */
 	g = (struct re_guts *)malloc(sizeof(struct re_guts) +
@@ -176,16 +267,16 @@
 	if (g == NULL)
 		return(REG_ESPACE);
 	p->ssize = len/(size_t)2*(size_t)3 + (size_t)1;	/* ugh */
-	p->strip = (sop *)calloc(p->ssize, sizeof(sop));
+	p->strip = malloc(p->ssize * sizeof(sop));
 	p->slen = 0;
 	if (p->strip == NULL) {
-		free((char *)g);
+		free(g);
 		return(REG_ESPACE);
 	}
 
 	/* set things up */
 	p->g = g;
-	p->next = (char *)pattern;	/* convenience; we do not modify it */
+	p->next = pattern;
 	p->end = p->next + len;
 	p->error = 0;
 	p->ncsalloc = 0;
@@ -213,11 +304,11 @@
 	EMIT(OEND, 0);
 	g->firststate = THERE();
 	if (cflags&REG_EXTENDED)
-		p_ere(p, OUT);
+		p_ere(p, OUT, 0);
 	else if (cflags&REG_NOSPEC)
 		p_str(p);
 	else
-		p_bre(p, OUT, OUT);
+		p_bre(p, OUT, OUT, 0);
 	EMIT(OEND, 0);
 	g->laststate = THERE();
 
@@ -244,21 +335,32 @@
 
 /*
  - p_ere - ERE parser top level, concatenation and alternation
+ == static void p_ere(struct parse *p, int stop, size_t reclimit);
  */
 static void
-p_ere(struct parse *p, int stop)	/* character this ERE should end at */
+p_ere(
+    struct parse *p,
+    int stop,			/* character this ERE should end at */
+    size_t reclimit)
 {
 	char c;
-	sopno prevback = 0;
-	sopno prevfwd = 0;
+	sopno prevback = 0;	/* pacify gcc */
+	sopno prevfwd = 0; 	/* pacify gcc */
 	sopno conc;
 	int first = 1;		/* is this the first alternative? */
 
+	_DIAGASSERT(p != NULL);
+
+	if (reclimit++ > RECLIMIT || p->error == REG_ESPACE) {
+		p->error = REG_ESPACE;
+		return;
+	}
+
 	for (;;) {
 		/* do a bunch of concatenated expressions */
 		conc = HERE();
 		while (MORE() && (c = PEEK()) != '|' && c != stop)
-			p_ere_exp(p);
+			p_ere_exp(p, reclimit);
 		REQUIRE(HERE() != conc, REG_EMPTY);	/* require nonempty */
 
 		if (!EAT('|'))
@@ -287,9 +389,12 @@
 
 /*
  - p_ere_exp - parse one subERE, an atom possibly followed by a repetition op
+ == static void p_ere_exp(struct parse *p, size_t reclimit);
  */
 static void
-p_ere_exp(struct parse *p)
+p_ere_exp(
+    struct parse *p,
+    size_t reclimit)
 {
 	char c;
 	sopno pos;
@@ -298,6 +403,8 @@
 	sopno subno;
 	int wascaret = 0;
 
+	_DIAGASSERT(p != NULL);
+
 	assert(MORE());		/* caller should have ensured this */
 	c = GETNEXT();
 
@@ -311,7 +418,7 @@
 			p->pbegin[subno] = HERE();
 		EMIT(OLPAREN, subno);
 		if (!SEE(')'))
-			p_ere(p, ')');
+			p_ere(p, ')', reclimit);
 		if (subno < NPAREN) {
 			p->pend[subno] = HERE();
 			assert(p->pend[subno] != 0);
@@ -365,7 +472,7 @@
 		ordinary(p, c);
 		break;
 	case '{':		/* okay as ordinary except if digit follows */
-		REQUIRE(!MORE() || !isdigit((uch)PEEK()), REG_BADRPT);
+		REQUIRE(!MORE() || !isdigit((unsigned char)PEEK()), REG_BADRPT);
 		/* FALLTHROUGH */
 	default:
 		ordinary(p, c);
@@ -377,7 +484,7 @@
 	c = PEEK();
 	/* we call { a repetition if followed by a digit */
 	if (!( c == '*' || c == '+' || c == '?' ||
-				(c == '{' && MORE2() && isdigit((uch)PEEK2())) ))
+	    (c == '{' && MORE2() && isdigit((unsigned char)PEEK2())) ))
 		return;		/* no repetition, we're done */
 	NEXT();
 
@@ -406,14 +513,14 @@
 	case '{':
 		count = p_count(p);
 		if (EAT(',')) {
-			if (isdigit((uch)PEEK())) {
+			if (isdigit((unsigned char)PEEK())) {
 				count2 = p_count(p);
 				REQUIRE(count <= count2, REG_BADBR);
 			} else		/* single number with comma */
 				count2 = INFINITY;
 		} else		/* just a single number */
 			count2 = count;
-		repeat(p, pos, count, count2);
+		repeat(p, pos, count, count2, 0);
 		if (!EAT('}')) {	/* error heuristics */
 			while (MORE() && PEEK() != '}')
 				NEXT();
@@ -427,17 +534,22 @@
 		return;
 	c = PEEK();
 	if (!( c == '*' || c == '+' || c == '?' ||
-				(c == '{' && MORE2() && isdigit((uch)PEEK2())) ) )
+	    (c == '{' && MORE2() && isdigit((unsigned char)PEEK2())) ) )
 		return;
 	SETERROR(REG_BADRPT);
 }
 
 /*
  - p_str - string (no metacharacters) "parser"
+ == static void p_str(struct parse *p);
  */
 static void
-p_str(struct parse *p)
+p_str(
+    struct parse *p)
 {
+
+	_DIAGASSERT(p != NULL);
+
 	REQUIRE(MORE(), REG_EMPTY);
 	while (MORE())
 		ordinary(p, GETNEXT());
@@ -445,6 +557,8 @@
 
 /*
  - p_bre - BRE parser top level, anchoring and concatenation
+ == static void p_bre(struct parse *p, int end1, \
+ ==	int end2, size_t reclimit);
  * Giving end1 as OUT essentially eliminates the end1/end2 check.
  *
  * This implementation is a bit of a kludge, in that a trailing $ is first
@@ -454,21 +568,32 @@
  * The amount of lookahead needed to avoid this kludge is excessive.
  */
 static void
-p_bre(struct parse *p,
+p_bre(
+    struct parse *p,
     int end1,		/* first terminating character */
-    int end2)		/* second terminating character */
+    int end2,		/* second terminating character */
+    size_t reclimit)
 {
-	sopno start = HERE();
+	sopno start;
 	int first = 1;			/* first subexpression? */
 	int wasdollar = 0;
 
+	_DIAGASSERT(p != NULL);
+
+	if (reclimit++ > RECLIMIT || p->error == REG_ESPACE) {
+		p->error = REG_ESPACE;
+		return;
+	}
+
+	start = HERE();
+
 	if (EAT('^')) {
 		EMIT(OBOL, 0);
 		p->g->iflags |= USEBOL;
 		p->g->nbol++;
 	}
 	while (MORE() && !SEETWO(end1, end2)) {
-		wasdollar = p_simp_re(p, first);
+		wasdollar = p_simp_re(p, first, reclimit);
 		first = 0;
 	}
 	if (wasdollar) {	/* oops, that was a trailing anchor */
@@ -483,26 +608,30 @@
 
 /*
  - p_simp_re - parse a simple RE, an atom possibly followed by a repetition
+ == static int p_simp_re(struct parse *p, int starordinary, size_t reclimit);
  */
 static int			/* was the simple RE an unbackslashed $? */
-p_simp_re(struct parse *p,
-    int starordinary)		/* is a leading * an ordinary character? */
+p_simp_re(
+    struct parse *p,
+    int starordinary,		/* is a leading * an ordinary character? */
+    size_t reclimit)
 {
 	int c;
 	int count;
 	int count2;
-	sopno pos;
-	int i;
+	sopno pos, i;
 	sopno subno;
 #	define	BACKSL	(1<<CHAR_BIT)
 
+	_DIAGASSERT(p != NULL);
+
 	pos = HERE();		/* repetion op, if any, covers from here */
 
 	assert(MORE());		/* caller should have ensured this */
 	c = GETNEXT();
 	if (c == '\\') {
 		REQUIRE(MORE(), REG_EESCAPE);
-		c = BACKSL | GETNEXT();
+		c = BACKSL | (unsigned char)GETNEXT();
 	}
 	switch (c) {
 	case '.':
@@ -525,7 +654,7 @@
 		EMIT(OLPAREN, subno);
 		/* the MORE here is an error heuristic */
 		if (MORE() && !SEETWO('\\', ')'))
-			p_bre(p, '\\', ')');
+			p_bre(p, '\\', ')', reclimit);
 		if (subno < NPAREN) {
 			p->pend[subno] = HERE();
 			assert(p->pend[subno] != 0);
@@ -564,7 +693,7 @@
 		REQUIRE(starordinary, REG_BADRPT);
 		/* FALLTHROUGH */
 	default:
-		ordinary(p, (char)c);
+		ordinary(p, c &~ BACKSL);
 		break;
 	}
 
@@ -577,21 +706,21 @@
 	} else if (EATTWO('\\', '{')) {
 		count = p_count(p);
 		if (EAT(',')) {
-			if (MORE() && isdigit((uch)PEEK())) {
+			if (MORE() && isdigit((unsigned char)PEEK())) {
 				count2 = p_count(p);
 				REQUIRE(count <= count2, REG_BADBR);
 			} else		/* single number with comma */
 				count2 = INFINITY;
 		} else		/* just a single number */
 			count2 = count;
-		repeat(p, pos, count, count2);
+		repeat(p, pos, count, count2, 0);
 		if (!EATTWO('\\', '}')) {	/* error heuristics */
 			while (MORE() && !SEETWO('\\', '}'))
 				NEXT();
 			REQUIRE(MORE(), REG_EBRACE);
 			SETERROR(REG_BADBR);
 		}
-	} else if (c == '$')	/* $ (but not \$) ends it */
+	} else if (c == (unsigned char)'$')	/* $ (but not \$) ends it */
 		return(1);
 
 	return(0);
@@ -599,14 +728,18 @@
 
 /*
  - p_count - parse a repetition count
+ == static int p_count(struct parse *p);
  */
 static int			/* the value */
-p_count(struct parse *p)
+p_count(
+    struct parse *p)
 {
 	int count = 0;
 	int ndigits = 0;
 
-	while (MORE() && isdigit((uch)PEEK()) && count <= DUPMAX) {
+	_DIAGASSERT(p != NULL);
+
+	while (MORE() && isdigit((unsigned char)PEEK()) && count <= DUPMAX) {
 		count = count*10 + (GETNEXT() - '0');
 		ndigits++;
 	}
@@ -617,33 +750,37 @@
 
 /*
  - p_bracket - parse a bracketed character list
+ == static void p_bracket(struct parse *p);
  *
  * Note a significant property of this code:  if the allocset() did SETERROR,
  * no set operations are done.
  */
 static void
-p_bracket(struct parse *p)
+p_bracket(
+    struct parse *p)
 {
 	cset *cs;
 	int invert = 0;
+	_DIAGASSERT(p != NULL);
+
+	cs = allocset(p);
+	if (cs == NULL)
+		return;
 
 	/* Dept of Truly Sickening Special-Case Kludges */
-	if (p->next + 5 < p->end && strncmp(p->next, "[:<:]]", 6) == 0) {
+	if (p->next + 5 < p->end && strncmp(p->next, "[:<:]]",
+					    (size_t)6) == 0) {
 		EMIT(OBOW, 0);
 		NEXTn(6);
 		return;
 	}
-	if (p->next + 5 < p->end && strncmp(p->next, "[:>:]]", 6) == 0) {
+	if (p->next + 5 < p->end && strncmp(p->next, "[:>:]]",
+					    (size_t)6) == 0) {
 		EMIT(OEOW, 0);
 		NEXTn(6);
 		return;
 	}
 
-	if ((cs = allocset(p)) == NULL) {
-		/* allocset did set error status in p */
-		return;
-	}
-
 	if (EAT('^'))
 		invert++;	/* make note to invert set at end */
 	if (EAT(']'))
@@ -656,18 +793,16 @@
 		CHadd(cs, '-');
 	MUSTEAT(']', REG_EBRACK);
 
-	if (p->error != 0) {	/* don't mess things up further */
-		freeset(p, cs);
+	if (p->error != 0)	/* don't mess things up further */
 		return;
-	}
 
 	if (p->g->cflags&REG_ICASE) {
-		int i;
+		ssize_t i;
 		int ci;
 
 		for (i = p->g->csetsize - 1; i >= 0; i--)
 			if (CHIN(cs, i) && isalpha(i)) {
-				ci = othercase(i);
+				ci = othercase((int)i);
 				if (ci != i)
 					CHadd(cs, ci);
 			}
@@ -675,13 +810,13 @@
 			mccase(p, cs);
 	}
 	if (invert) {
-		int i;
+		ssize_t i;
 
 		for (i = p->g->csetsize - 1; i >= 0; i--)
 			if (CHIN(cs, i))
-				CHsub(cs, i);
+				CHsub(cs, (int)i);
 			else
-				CHadd(cs, i);
+				CHadd(cs, (int)i);
 		if (p->g->cflags&REG_NEWLINE)
 			CHsub(cs, '\n');
 		if (cs->multis != NULL)
@@ -699,23 +834,30 @@
 
 /*
  - p_b_term - parse one term of a bracketed character list
+ == static void p_b_term(struct parse *p, cset *cs);
  */
 static void
-p_b_term(struct parse *p, cset *cs)
+p_b_term(
+    struct parse *p,
+    cset *cs)
 {
 	char c;
 	char start, finish;
 	int i;
 
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
 	/* classify what we've got */
 	switch ((MORE()) ? PEEK() : '\0') {
 	case '[':
 		c = (MORE2()) ? PEEK2() : '\0';
 		break;
+
 	case '-':
 		SETERROR(REG_ERANGE);
 		return;			/* NOTE RETURN */
-		break;
+
 	default:
 		c = '\0';
 		break;
@@ -762,17 +904,25 @@
 
 /*
  - p_b_cclass - parse a character-class name and deal with it
+ == static void p_b_cclass(struct parse *p, cset *cs);
  */
 static void
-p_b_cclass(struct parse *p, cset *cs)
+p_b_cclass(
+    struct parse *p,
+    cset *cs)
 {
-	char *sp = p->next;
+	const char *sp;
 	const struct cclass *cp;
 	size_t len;
-	char *u;
+	const char *u;
 	char c;
 
-	while (MORE() && isalpha(PEEK()))
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
+	sp = p->next;
+
+	while (MORE() && isalpha((unsigned char)PEEK()))
 		NEXT();
 	len = p->next - sp;
 	for (cp = cclasses; cp->name != NULL; cp++)
@@ -793,26 +943,36 @@
 
 /*
  - p_b_eclass - parse an equivalence-class name and deal with it
+ == static void p_b_eclass(struct parse *p, cset *cs);
  *
  * This implementation is incomplete. xxx
  */
 static void
-p_b_eclass(struct parse *p, cset *cs)
+p_b_eclass(
+    struct parse *p,
+    cset *cs)
 {
 	char c;
 
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
 	c = p_b_coll_elem(p, '=');
 	CHadd(cs, c);
 }
 
 /*
  - p_b_symbol - parse a character or [..]ed multicharacter collating symbol
+ == static char p_b_symbol(struct parse *p);
  */
 static char			/* value of symbol */
-p_b_symbol(struct parse *p)
+p_b_symbol(
+    struct parse *p)
 {
 	char value;
 
+	_DIAGASSERT(p != NULL);
+
 	REQUIRE(MORE(), REG_EBRACK);
 	if (!EATTWO('[', '.'))
 		return(GETNEXT());
@@ -825,14 +985,20 @@
 
 /*
  - p_b_coll_elem - parse a collating-element name and look it up
+ == static char p_b_coll_elem(struct parse *p, int endc);
  */
 static char			/* value of collating element */
-p_b_coll_elem(struct parse *p,
+p_b_coll_elem(
+    struct parse *p,
     int endc)			/* name ended by endc,']' */
 {
-	char *sp = p->next;
+	const char *sp;
 	const struct cname *cp;
-	int len;
+	size_t len;
+
+	_DIAGASSERT(p != NULL);
+
+	sp = p->next;
 
 	while (MORE() && !SEETWO(endc, ']'))
 		NEXT();
@@ -852,33 +1018,41 @@
 
 /*
  - othercase - return the case counterpart of an alphabetic
+ == static int othercase(int ch);
  */
-static char			/* if no counterpart, return ch */
-othercase(int ch)
+static int			/* if no counterpart, return ch */
+othercase(
+    int ch)
 {
-	ch = (uch)ch;
 	assert(isalpha(ch));
 	if (isupper(ch))
-		return ((uch)tolower(ch));
+		return(tolower(ch));
 	else if (islower(ch))
-		return ((uch)toupper(ch));
+		return(toupper(ch));
 	else			/* peculiar, but could happen */
 		return(ch);
 }
 
 /*
  - bothcases - emit a dualcase version of a two-case character
+ == static void bothcases(struct parse *p, int ch);
  *
  * Boy, is this implementation ever a kludge...
  */
 static void
-bothcases(struct parse *p, int ch)
+bothcases(
+    struct parse *p,
+    int ch)
 {
-	char *oldnext = p->next;
-	char *oldend = p->end;
+	const char *oldnext;
+	const char *oldend;
 	char bracket[3];
 
-	ch = (uch)ch;
+	_DIAGASSERT(p != NULL);
+
+	oldnext = p->next;
+	oldend = p->end;
+
 	assert(othercase(ch) != ch);	/* p_bracket() would recurse */
 	p->next = bracket;
 	p->end = bracket+2;
@@ -893,33 +1067,50 @@
 
 /*
  - ordinary - emit an ordinary character
+ == static void ordinary(struct parse *p, int ch);
  */
 static void
-ordinary(struct parse *p, int ch)
+ordinary(
+    struct parse *p,
+    int ch)
 {
-	cat_t *cap = p->g->categories;
+	cat_t *cap;
 
-	if ((p->g->cflags&REG_ICASE) && isalpha((uch)ch) && othercase(ch) != ch)
-		bothcases(p, ch);
+	_DIAGASSERT(p != NULL);
+
+	cap = p->g->categories;
+	if ((p->g->cflags&REG_ICASE) && isalpha((unsigned char) ch)
+	    && othercase((unsigned char) ch) != (unsigned char) ch)
+		bothcases(p, (unsigned char) ch);
 	else {
-		EMIT(OCHAR, (uch)ch);
-		if (cap[ch] == 0)
-			cap[ch] = p->g->ncategories++;
+		EMIT(OCHAR, (sopno)(unsigned char)ch);
+		if (cap[ch] == 0) {
+			_DIAGASSERT(__type_fit(unsigned char,
+			    p->g->ncategories + 1));
+			cap[ch] = (unsigned char)p->g->ncategories++;
+		}
 	}
 }
 
 /*
  - nonnewline - emit REG_NEWLINE version of OANY
+ == static void nonnewline(struct parse *p);
  *
  * Boy, is this implementation ever a kludge...
  */
 static void
-nonnewline(struct parse *p)
+nonnewline(
+    struct parse *p)
 {
-	char *oldnext = p->next;
-	char *oldend = p->end;
+	const char *oldnext;
+	const char *oldend;
 	char bracket[4];
 
+	_DIAGASSERT(p != NULL);
+
+	oldnext = p->next;
+	oldend = p->end;
+
 	p->next = bracket;
 	p->end = bracket+3;
 	bracket[0] = '^';
@@ -934,23 +1125,33 @@
 
 /*
  - repeat - generate code for a bounded repetition, recursively if needed
+ == static void repeat(struct parse *p, sopno start, int from, int to,
+ == size_t reclimit);
  */
 static void
-repeat(struct parse *p,
+repeat(
+    struct parse *p,
     sopno start,		/* operand from here to end of strip */
     int from,			/* repeated from this number */
-    int to)			/* to this number of times (maybe INFINITY) */
+    int to,			/* to this number of times (maybe INFINITY) */
+    size_t reclimit)
 {
-	sopno finish = HERE();
+	sopno finish;
 #	define	N	2
 #	define	INF	3
 #	define	REP(f, t)	((f)*8 + (t))
 #	define	MAP(n)	(((n) <= 1) ? (n) : ((n) == INFINITY) ? INF : N)
 	sopno copy;
 
-	if (p->error != 0)	/* head off possible runaway recursion */
+	_DIAGASSERT(p != NULL);
+
+	if (reclimit++ > RECLIMIT) 
+		p->error = REG_ESPACE;
+	if (p->error)
 		return;
 
+	finish = HERE();
+
 	assert(from <= to);
 
 	switch (REP(MAP(from), MAP(to))) {
@@ -962,7 +1163,7 @@
 	case REP(0, INF):		/* as x{1,}? */
 		/* KLUDGE: emit y? as (y|) until subtle bug gets fixed */
 		INSERT(OCH_, start);		/* offset is wrong... */
-		repeat(p, start+1, 1, to);
+		repeat(p, start+1, 1, to, reclimit);
 		ASTERN(OOR1, start);
 		AHEAD(start);			/* ... fix it */
 		EMIT(OOR2, 0);
@@ -982,7 +1183,7 @@
 		ASTERN(O_CH, THERETHERE());
 		copy = dupl(p, start+1, finish+1);
 		assert(copy == finish+4);
-		repeat(p, copy, 1, to-1);
+		repeat(p, copy, 1, to-1, reclimit);
 		break;
 	case REP(1, INF):		/* as x+ */
 		INSERT(OPLUS_, start);
@@ -990,11 +1191,11 @@
 		break;
 	case REP(N, N):			/* as xx{m-1,n-1} */
 		copy = dupl(p, start, finish);
-		repeat(p, copy, from-1, to-1);
+		repeat(p, copy, from-1, to-1, reclimit);
 		break;
 	case REP(N, INF):		/* as xx{n-1,INF} */
 		copy = dupl(p, start, finish);
-		repeat(p, copy, from-1, to);
+		repeat(p, copy, from-1, to, reclimit);
 		break;
 	default:			/* "can't happen" */
 		SETERROR(REG_ASSERT);	/* just in case */
@@ -1004,10 +1205,16 @@
 
 /*
  - seterr - set an error condition
+ == static int seterr(struct parse *p, int e);
  */
 static int			/* useless but makes type checking happy */
-seterr(struct parse *p, int e)
+seterr(
+    struct parse *p,
+    int e)
 {
+
+	_DIAGASSERT(p != NULL);
+
 	if (p->error == 0)	/* keep earliest error condition */
 		p->error = e;
 	p->next = nuls;		/* try to bring things to a halt */
@@ -1017,81 +1224,92 @@
 
 /*
  - allocset - allocate a set of characters for []
+ == static cset *allocset(struct parse *p);
  */
 static cset *
-allocset(struct parse *p)
+allocset(
+    struct parse *p)
 {
-	int no = p->g->ncsets++;
+	size_t no;
 	size_t nc;
 	size_t nbytes;
 	cset *cs;
-	size_t css = (size_t)p->g->csetsize;
-	int i;
+	size_t css;
+	size_t i;
 
+	_DIAGASSERT(p != NULL);
+
+	no = p->g->ncsets++;
+	css = (size_t)p->g->csetsize;
 	if (no >= p->ncsalloc) {	/* need another column of space */
-		void *ptr;
-
 		p->ncsalloc += CHAR_BIT;
 		nc = p->ncsalloc;
 		assert(nc % CHAR_BIT == 0);
 		nbytes = nc / CHAR_BIT * css;
-
-		ptr = (cset *)realloc((char *)p->g->sets, nc * sizeof(cset));
-		if (ptr == NULL)
-			goto nomem;
-		p->g->sets = ptr;
-
-		ptr = (uch *)realloc((char *)p->g->setbits, nbytes);
-		if (ptr == NULL)
-			goto nomem;
-		p->g->setbits = ptr;
-
-		for (i = 0; i < no; i++)
-			p->g->sets[i].ptr = p->g->setbits + css*(i/CHAR_BIT);
-
-		(void) memset((char *)p->g->setbits + (nbytes - css), 0, css);
+		if (MEMSIZE(p) > MEMLIMIT)
+			goto oomem;
+		if (p->g->sets == NULL)
+			p->g->sets = malloc(nc * sizeof(cset));
+		else
+			p->g->sets = realloc(p->g->sets, nc * sizeof(cset));
+		if (p->g->setbits == NULL)
+			p->g->setbits = malloc(nbytes);
+		else {
+			p->g->setbits = realloc(p->g->setbits, nbytes);
+			/* xxx this isn't right if setbits is now NULL */
+			for (i = 0; i < no; i++)
+				p->g->sets[i].ptr = p->g->setbits + css*(i/CHAR_BIT);
+		}
+		if (p->g->sets != NULL && p->g->setbits != NULL)
+			(void) memset((char *)p->g->setbits + (nbytes - css),
+								0, css);
+		else {
+oomem:
+			no = 0;
+			SETERROR(REG_ESPACE);
+			/* caller's responsibility not to do set ops */
+			return NULL;
+		}
 	}
-	/* XXX should not happen */
-	if (p->g->sets == NULL || p->g->setbits == NULL)
-		goto nomem;
 
 	cs = &p->g->sets[no];
 	cs->ptr = p->g->setbits + css*((no)/CHAR_BIT);
-	cs->mask = 1 << ((no) % CHAR_BIT);
+	cs->mask = 1 << (unsigned int)((no) % CHAR_BIT);
 	cs->hash = 0;
 	cs->smultis = 0;
 	cs->multis = NULL;
 
 	return(cs);
-nomem:
-	free(p->g->sets);
-	p->g->sets = NULL;
-	free(p->g->setbits);
-	p->g->setbits = NULL;
-
-	SETERROR(REG_ESPACE);
-	/* caller's responsibility not to do set ops */
-	return(NULL);
 }
 
 /*
  - freeset - free a now-unused set
+ == static void freeset(struct parse *p, cset *cs);
  */
 static void
-freeset(struct parse *p, cset *cs)
+freeset(
+    struct parse *p,
+    cset *cs)
 {
-	int i;
-	cset *top = &p->g->sets[p->g->ncsets];
-	size_t css = (size_t)p->g->csetsize;
+	size_t i;
+	cset *top;
+	size_t css;
 
-	for (i = 0; i < (ssize_t)css; i++)
-		CHsub(cs, i);
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
+	top = &p->g->sets[p->g->ncsets];
+	css = (size_t)p->g->csetsize;
+
+	for (i = 0; i < css; i++)
+		CHsub(cs, (int)i);
 	if (cs == top-1)	/* recover only the easy case */
 		p->g->ncsets--;
 }
 
 /*
  - freezeset - final processing on a set of characters
+ == static int freezeset(struct parse *p, cset *cs);
  *
  * The main task here is merging identical sets.  This is usually a waste
  * of time (although the hash code minimizes the overhead), but can win
@@ -1099,23 +1317,32 @@
  * is done using addition rather than xor -- all ASCII [aA] sets xor to
  * the same value!
  */
-static int			/* set number */
-freezeset(struct parse *p, cset *cs)
+static sopno			/* set number */
+freezeset(
+    struct parse *p,
+    cset *cs)
 {
-	uch h = cs->hash;
-	int i;
-	cset *top = &p->g->sets[p->g->ncsets];
+	uch h;
+	size_t i;
+	cset *top;
 	cset *cs2;
-	size_t css = (size_t)p->g->csetsize;
+	size_t css;
+
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
+	h = cs->hash;
+	top = &p->g->sets[p->g->ncsets];
+	css = (size_t)p->g->csetsize;
 
 	/* look for an earlier one which is the same */
 	for (cs2 = &p->g->sets[0]; cs2 < top; cs2++)
 		if (cs2->hash == h && cs2 != cs) {
 			/* maybe */
-			for (i = 0; i < (ssize_t)css; i++)
+			for (i = 0; i < css; i++)
 				if (!!CHIN(cs2, i) != !!CHIN(cs, i))
 					break;		/* no */
-			if (i == (ssize_t)css)
+			if (i == css)
 				break;			/* yes */
 		}
 
@@ -1124,19 +1351,27 @@
 		cs = cs2;
 	}
 
-	return((int)(cs - p->g->sets));
+	return (sopno)(cs - p->g->sets);
 }
 
 /*
  - firstch - return first character in a set (which must have at least one)
+ == static int firstch(struct parse *p, cset *cs);
  */
 static int			/* character; there is no "none" value */
-firstch(struct parse *p, cset *cs)
+firstch(
+    struct parse *p,
+    cset *cs)
 {
-	int i;
-	size_t css = (size_t)p->g->csetsize;
+	size_t i;
+	size_t css;
 
-	for (i = 0; i < (ssize_t)css; i++)
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
+	css = (size_t)p->g->csetsize;
+
+	for (i = 0; i < css; i++)
 		if (CHIN(cs, i))
 			return((char)i);
 	assert(never);
@@ -1145,15 +1380,23 @@
 
 /*
  - nch - number of characters in a set
+ == static int nch(struct parse *p, cset *cs);
  */
 static int
-nch(struct parse *p, cset *cs)
+nch(
+    struct parse *p,
+    cset *cs)
 {
-	int i;
-	size_t css = (size_t)p->g->csetsize;
+	size_t i;
+	size_t css;
 	int n = 0;
 
-	for (i = 0; i < (ssize_t)css; i++)
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
+	css = (size_t)p->g->csetsize;
+
+	for (i = 0; i < css; i++)
 		if (CHIN(cs, i))
 			n++;
 	return(n);
@@ -1161,63 +1404,170 @@
 
 /*
  - mcadd - add a collating element to a cset
+ == static void mcadd(struct parse *p, cset *cs, \
+ ==	char *cp);
  */
 static void
-mcadd( struct parse *p, cset *cs, char *cp)
+mcadd(
+    struct parse *p,
+    cset *cs,
+    const char *cp)
 {
-	size_t oldend = cs->smultis;
-	void *np;
+	size_t oldend;
+
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+	_DIAGASSERT(cp != NULL);
+
+	oldend = cs->smultis;
 
 	cs->smultis += strlen(cp) + 1;
-	np = realloc(cs->multis, cs->smultis);
-	if (np == NULL) {
-		if (cs->multis)
-			free(cs->multis);
-		cs->multis = NULL;
+	if (cs->multis == NULL)
+		cs->multis = malloc(cs->smultis);
+	else
+		cs->multis = realloc(cs->multis, cs->smultis);
+	if (cs->multis == NULL) {
 		SETERROR(REG_ESPACE);
 		return;
 	}
-	cs->multis = np;
 
-	strlcpy(cs->multis + oldend - 1, cp, cs->smultis - oldend + 1);
+	(void) strcpy(cs->multis + oldend - 1, cp);
+	cs->multis[cs->smultis - 1] = '\0';
+}
+
+#if 0
+/*
+ - mcsub - subtract a collating element from a cset
+ == static void mcsub(cset *cs, char *cp);
+ */
+static void
+mcsub(
+    cset *cs,
+    char *cp)
+{
+	char *fp;
+	size_t len;
+
+	_DIAGASSERT(cs != NULL);
+	_DIAGASSERT(cp != NULL);
+
+	fp = mcfind(cs, cp);
+	len = strlen(fp);
+
+	assert(fp != NULL);
+	(void) memmove(fp, fp + len + 1,
+				cs->smultis - (fp + len + 1 - cs->multis));
+	cs->smultis -= len;
+
+	if (cs->smultis == 0) {
+		free(cs->multis);
+		cs->multis = NULL;
+		return;
+	}
+
+	cs->multis = realloc(cs->multis, cs->smultis);
+	assert(cs->multis != NULL);
 }
 
 /*
+ - mcin - is a collating element in a cset?
+ == static int mcin(cset *cs, char *cp);
+ */
+static int
+mcin(
+    cset *cs,
+    char *cp)
+{
+
+	_DIAGASSERT(cs != NULL);
+	_DIAGASSERT(cp != NULL);
+
+	return(mcfind(cs, cp) != NULL);
+}
+
+/*
+ - mcfind - find a collating element in a cset
+ == static char *mcfind(cset *cs, char *cp);
+ */
+static char *
+mcfind(
+    cset *cs,
+    char *cp)
+{
+	char *p;
+
+	_DIAGASSERT(cs != NULL);
+	_DIAGASSERT(cp != NULL);
+
+	if (cs->multis == NULL)
+		return(NULL);
+	for (p = cs->multis; *p != '\0'; p += strlen(p) + 1)
+		if (strcmp(cp, p) == 0)
+			return(p);
+	return(NULL);
+}
+#endif
+
+/*
  - mcinvert - invert the list of collating elements in a cset
+ == static void mcinvert(struct parse *p, cset *cs);
  *
  * This would have to know the set of possibilities.  Implementation
  * is deferred.
  */
 /* ARGSUSED */
 static void
-mcinvert(struct parse *p, cset *cs)
+mcinvert(
+    struct parse *p,
+    cset *cs)
 {
+
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
 	assert(cs->multis == NULL);	/* xxx */
 }
 
 /*
  - mccase - add case counterparts of the list of collating elements in a cset
+ == static void mccase(struct parse *p, cset *cs);
  *
  * This would have to know the set of possibilities.  Implementation
  * is deferred.
  */
 /* ARGSUSED */
 static void
-mccase(struct parse *p, cset *cs)
+mccase(
+    struct parse *p,
+    cset *cs)
 {
+
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(cs != NULL);
+
 	assert(cs->multis == NULL);	/* xxx */
 }
 
 /*
  - isinsets - is this character in any sets?
+ == static int isinsets(struct re_guts *g, int c);
  */
 static int			/* predicate */
-isinsets(struct re_guts *g, int c)
+isinsets(
+    struct re_guts *g,
+    int c)
 {
 	uch *col;
-	int i;
-	int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
-	unsigned uc = (uch)c;
+	size_t i;
+	size_t ncols;
+	unsigned uc = (unsigned char)c;
+
+	_DIAGASSERT(g != NULL);
+
+	if (g->setbits == NULL)
+		return 0;
+
+	ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
 
 	for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize)
 		if (col[uc] != 0)
@@ -1227,15 +1577,23 @@
 
 /*
  - samesets - are these two characters in exactly the same sets?
+ == static int samesets(struct re_guts *g, int c1, int c2);
  */
 static int			/* predicate */
-samesets(struct re_guts *g, int c1, int c2)
+samesets(
+    struct re_guts *g,
+    int c1,
+    int c2)
 {
 	uch *col;
-	int i;
-	int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
-	unsigned uc1 = (uch)c1;
-	unsigned uc2 = (uch)c2;
+	size_t i;
+	size_t ncols;
+	unsigned uc1 = (unsigned char)c1;
+	unsigned uc2 = (unsigned char)c2;
+
+	_DIAGASSERT(g != NULL);
+
+	ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT;
 
 	for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize)
 		if (col[uc1] != col[uc2])
@@ -1245,21 +1603,31 @@
 
 /*
  - categorize - sort out character categories
+ == static void categorize(struct parse *p, struct re_guts *g);
  */
 static void
-categorize(struct parse *p, struct re_guts *g)
+categorize(
+    struct parse *p,
+    struct re_guts *g)
 {
-	cat_t *cats = g->categories;
+	cat_t *cats;
 	int c;
 	int c2;
 	cat_t cat;
 
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(g != NULL);
+
+	cats = g->categories;
+
 	/* avoid making error situations worse */
 	if (p->error != 0)
 		return;
 
 	for (c = CHAR_MIN; c <= CHAR_MAX; c++)
 		if (cats[c] == 0 && isinsets(g, c)) {
+			_DIAGASSERT(__type_fit(unsigned char,
+			    g->ncategories + 1));
 			cat = g->ncategories++;
 			cats[c] = cat;
 			for (c2 = c+1; c2 <= CHAR_MAX; c2++)
@@ -1270,36 +1638,48 @@
 
 /*
  - dupl - emit a duplicate of a bunch of sops
+ == static sopno dupl(struct parse *p, sopno start, sopno finish);
  */
 static sopno			/* start of duplicate */
-dupl(struct parse *p,
-    sopno start,		/* from here */
-    sopno finish)		/* to this less one */
+dupl(
+    struct parse *p,
+    sopno start,			/* from here */
+    sopno finish)			/* to this less one */
 {
-	sopno ret = HERE();
+	sopno ret;
 	sopno len = finish - start;
 
+	_DIAGASSERT(p != NULL);
+
+	ret = HERE();
+
 	assert(finish >= start);
 	if (len == 0)
 		return(ret);
-	enlarge(p, p->ssize + len);	/* this many unexpected additions */
-	assert(p->ssize >= p->slen + len);
-	(void) memcpy((char *)(p->strip + p->slen),
-		(char *)(p->strip + start), (size_t)len*sizeof(sop));
+	if (!enlarge(p, p->ssize + len))/* this many unexpected additions */
+		return ret;
+	(void)memcpy(p->strip + p->slen, p->strip + start,
+	    (size_t)len * sizeof(sop));
 	p->slen += len;
 	return(ret);
 }
 
 /*
  - doemit - emit a strip operator
+ == static void doemit(struct parse *p, sop op, size_t opnd);
  *
  * It might seem better to implement this as a macro with a function as
  * hard-case backup, but it's just too big and messy unless there are
  * some changes to the data structures.  Maybe later.
  */
 static void
-doemit(struct parse *p, sop op, size_t opnd)
+doemit(
+    struct parse *p,
+    sop op,
+    sopno opnd)
 {
+	_DIAGASSERT(p != NULL);
+
 	/* avoid making error situations worse */
 	if (p->error != 0)
 		return;
@@ -1309,23 +1689,30 @@
 
 	/* deal with undersized strip */
 	if (p->slen >= p->ssize)
-		enlarge(p, (p->ssize+1) / 2 * 3);	/* +50% */
-	assert(p->slen < p->ssize);
+		if (!enlarge(p, (p->ssize+1) / 2 * 3))	/* +50% */
+			return;
 
 	/* finally, it's all reduced to the easy case */
-	p->strip[p->slen++] = SOP(op, opnd);
+	p->strip[p->slen++] = (sop)SOP(op, opnd);
 }
 
 /*
  - doinsert - insert a sop into the strip
+ == static void doinsert(struct parse *p, sop op, size_t opnd, sopno pos);
  */
 static void
-doinsert(struct parse *p, sop op, size_t opnd, sopno pos)
+doinsert(
+    struct parse *p,
+    sop op,
+    sopno opnd,
+    sopno pos)
 {
 	sopno sn;
 	sop s;
 	int i;
 
+	_DIAGASSERT(p != NULL);
+
 	/* avoid making error situations worse */
 	if (p->error != 0)
 		return;
@@ -1346,53 +1733,78 @@
 		}
 	}
 
-	memmove((char *)&p->strip[pos+1], (char *)&p->strip[pos],
-						(HERE()-pos-1)*sizeof(sop));
+	memmove(&p->strip[pos+1], &p->strip[pos], (HERE()-pos-1)*sizeof(sop));
 	p->strip[pos] = s;
 }
 
 /*
  - dofwd - complete a forward reference
+ == static void dofwd(struct parse *p, sopno pos, sop value);
  */
 static void
-dofwd(struct parse *p, sopno pos, sop value)
+dofwd(
+    struct parse *p,
+    sopno pos,
+    sopno value)
 {
+
+	_DIAGASSERT(p != NULL);
+
 	/* avoid making error situations worse */
 	if (p->error != 0)
 		return;
 
 	assert(value < 1<<OPSHIFT);
-	p->strip[pos] = OP(p->strip[pos]) | value;
+	p->strip[pos] = (sop)(OP(p->strip[pos]) | value);
 }
 
 /*
  - enlarge - enlarge the strip
+ == static void enlarge(struct parse *p, sopno size);
  */
-static void
-enlarge(struct parse *p, sopno size)
+static int
+enlarge(
+    struct parse *p,
+    sopno size)
 {
 	sop *sp;
+	sopno osize;
+
+	_DIAGASSERT(p != NULL);
 
 	if (p->ssize >= size)
-		return;
+		return 1;
 
-	sp = (sop *)realloc(p->strip, size*sizeof(sop));
+	osize = p->ssize;
+	p->ssize = size;
+	if (MEMSIZE(p) > MEMLIMIT)
+		goto oomem;
+	sp = realloc(p->strip, p->ssize * sizeof(sop));
 	if (sp == NULL) {
+oomem:
+		p->ssize = osize;
 		SETERROR(REG_ESPACE);
-		return;
+		return 0;
 	}
 	p->strip = sp;
-	p->ssize = size;
+	return 1;
 }
 
 /*
  - stripsnug - compact the strip
+ == static void stripsnug(struct parse *p, struct re_guts *g);
  */
 static void
-stripsnug(struct parse *p, struct re_guts *g)
+stripsnug(
+    struct parse *p,
+    struct re_guts *g)
 {
+
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(g != NULL);
+
 	g->nstates = p->slen;
-	g->strip = (sop *)realloc((char *)p->strip, p->slen * sizeof(sop));
+	g->strip = realloc(p->strip, p->slen * sizeof(sop));
 	if (g->strip == NULL) {
 		SETERROR(REG_ESPACE);
 		g->strip = p->strip;
@@ -1401,6 +1813,7 @@
 
 /*
  - findmust - fill in must and mlen with longest mandatory literal string
+ == static void findmust(struct parse *p, struct re_guts *g);
  *
  * This algorithm could do fancy things like analyzing the operands of |
  * for common subsequences.  Someday.  This code is simple and finds most
@@ -1409,16 +1822,21 @@
  * Note that must and mlen got initialized during setup.
  */
 static void
-findmust(struct parse *p, struct re_guts *g)
+findmust(
+    struct parse *p,
+    struct re_guts *g)
 {
 	sop *scan;
-	sop *start = NULL;    /* start initialized in the default case, after that */
-	sop *newstart; /* newstart was initialized in the OCHAR case */
+	sop *start = NULL;
+	sop *newstart = NULL;
 	sopno newlen;
 	sop s;
 	char *cp;
 	sopno i;
 
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(g != NULL);
+
 	/* avoid making error situations worse */
 	if (p->error != 0)
 		return;
@@ -1451,7 +1869,7 @@
 					return;
 				}
 			} while (OP(s) != O_QUEST && OP(s) != O_CH);
-			/* fallthrough */
+			/* FALLTHROUGH */
 		default:		/* things that break a sequence */
 			if (newlen > g->mlen) {		/* ends one */
 				start = newstart;
@@ -1462,7 +1880,10 @@
 		}
 	} while (OP(s) != OEND);
 
-	if (g->mlen == 0)		/* there isn't one */
+	if (start == NULL)
+		g->mlen = 0;
+
+	if (g->mlen == 0)	/* there isn't one */
 		return;
 
 	/* turn it into a character string */
@@ -1485,15 +1906,21 @@
 
 /*
  - pluscount - count + nesting
+ == static sopno pluscount(struct parse *p, struct re_guts *g);
  */
 static sopno			/* nesting depth */
-pluscount(struct parse *p, struct re_guts *g)
+pluscount(
+    struct parse *p,
+    struct re_guts *g)
 {
 	sop *scan;
 	sop s;
 	sopno plusnest = 0;
 	sopno maxnest = 0;
 
+	_DIAGASSERT(p != NULL);
+	_DIAGASSERT(g != NULL);
+
 	if (p->error != 0)
 		return(0);	/* there may not be an OEND */
 
diff --git a/libc/upstream-netbsd/libc/regex/regerror.c b/libc/upstream-netbsd/libc/regex/regerror.c
new file mode 100644
index 0000000..e00d7c0
--- /dev/null
+++ b/libc/upstream-netbsd/libc/regex/regerror.c
@@ -0,0 +1,223 @@
+/*	$NetBSD: regerror.c,v 1.23 2007/02/09 23:44:18 junyoung Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regerror.c	8.4 (Berkeley) 3/20/94
+ */
+
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regerror.c	8.4 (Berkeley) 3/20/94
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)regerror.c	8.4 (Berkeley) 3/20/94";
+#else
+__RCSID("$NetBSD: regerror.c,v 1.23 2007/02/09 23:44:18 junyoung Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
+#include <sys/types.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <regex.h>
+
+#ifdef __weak_alias
+__weak_alias(regerror,_regerror)
+#endif
+
+#include "utils.h"
+
+/* ========= begin header generated by ./mkh ========= */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* === regerror.c === */
+static const char *regatoi(const regex_t *preg, char *localbuf, size_t buflen);
+
+#ifdef __cplusplus
+}
+#endif
+/* ========= end header generated by ./mkh ========= */
+/*
+ = #define	REG_NOMATCH	 1
+ = #define	REG_BADPAT	 2
+ = #define	REG_ECOLLATE	 3
+ = #define	REG_ECTYPE	 4
+ = #define	REG_EESCAPE	 5
+ = #define	REG_ESUBREG	 6
+ = #define	REG_EBRACK	 7
+ = #define	REG_EPAREN	 8
+ = #define	REG_EBRACE	 9
+ = #define	REG_BADBR	10
+ = #define	REG_ERANGE	11
+ = #define	REG_ESPACE	12
+ = #define	REG_BADRPT	13
+ = #define	REG_EMPTY	14
+ = #define	REG_ASSERT	15
+ = #define	REG_INVARG	16
+ = #define	REG_ATOI	255	// convert name to number (!)
+ = #define	REG_ITOA	0400	// convert number to name (!)
+ */
+static const struct rerr {
+	int code;
+	const char *name;
+	const char *explain;
+} rerrs[] = {
+	{ REG_NOMATCH,	"REG_NOMATCH",	"regexec() failed to match" },
+	{ REG_BADPAT,	"REG_BADPAT",	"invalid regular expression" },
+	{ REG_ECOLLATE,	"REG_ECOLLATE",	"invalid collating element" },
+	{ REG_ECTYPE,	"REG_ECTYPE",	"invalid character class" },
+	{ REG_EESCAPE,	"REG_EESCAPE",	"trailing backslash (\\)" },
+	{ REG_ESUBREG,	"REG_ESUBREG",	"invalid backreference number" },
+	{ REG_EBRACK,	"REG_EBRACK",	"brackets ([ ]) not balanced" },
+	{ REG_EPAREN,	"REG_EPAREN",	"parentheses not balanced" },
+	{ REG_EBRACE,	"REG_EBRACE",	"braces not balanced" },
+	{ REG_BADBR,	"REG_BADBR",	"invalid repetition count(s)" },
+	{ REG_ERANGE,	"REG_ERANGE",	"invalid character range" },
+	{ REG_ESPACE,	"REG_ESPACE",	"out of memory" },
+	{ REG_BADRPT,	"REG_BADRPT",	"repetition-operator operand invalid" },
+	{ REG_EMPTY,	"REG_EMPTY",	"empty (sub)expression" },
+	{ REG_ASSERT,	"REG_ASSERT",	"\"can't happen\" -- you found a bug" },
+	{ REG_INVARG,	"REG_INVARG",	"invalid argument to regex routine" },
+	{ 0,		"",		"*** unknown regexp error code ***" }
+};
+
+/*
+ * regerror - the interface to error numbers
+ * extern size_t regerror(int, const regex_t *, char *, size_t);
+ */
+/* ARGSUSED */
+size_t
+regerror(
+    int errcode,
+    const regex_t *preg,
+    char *errbuf,
+    size_t errbuf_size)
+{
+	const struct rerr *r;
+	size_t len;
+	int target = errcode &~ REG_ITOA;
+	const char *s;
+	char convbuf[50];
+
+	_DIAGASSERT(errcode != REG_ATOI || preg != NULL);
+	_DIAGASSERT(errbuf != NULL);
+
+	if (errcode == REG_ATOI)
+		s = regatoi(preg, convbuf, sizeof convbuf);
+	else {
+		for (r = rerrs; r->code != 0; r++)
+			if (r->code == target)
+				break;
+	
+		if (errcode & REG_ITOA) {
+			if (r->code != 0) {
+				(void)strlcpy(convbuf, r->name, sizeof convbuf);
+			} else
+				(void)snprintf(convbuf, sizeof convbuf,
+				    "REG_0x%x", target);
+			s = convbuf;
+		} else
+			s = r->explain;
+	}
+
+	len = strlen(s) + 1;
+	if (errbuf_size > 0)
+		(void)strlcpy(errbuf, s, errbuf_size);
+
+	return(len);
+}
+
+/*
+ * regatoi - internal routine to implement REG_ATOI
+ * static const char *regatoi(const regex_t *preg, char *localbuf,
+ * size_t buflen);
+ */
+static const char *
+regatoi(
+    const regex_t *preg,
+    char *localbuf,
+    size_t buflen)
+{
+	const struct rerr *r;
+
+	for (r = rerrs; r->code != 0; r++)
+		if (strcmp(r->name, preg->re_endp) == 0)
+			break;
+	if (r->code == 0)
+		return "0";
+
+	(void)snprintf(localbuf, buflen, "%d", r->code);
+	return localbuf;
+}
diff --git a/libc/upstream-netbsd/libc/regex/regex2.h b/libc/upstream-netbsd/libc/regex/regex2.h
new file mode 100644
index 0000000..7c877ee
--- /dev/null
+++ b/libc/upstream-netbsd/libc/regex/regex2.h
@@ -0,0 +1,209 @@
+/*	$NetBSD: regex2.h,v 1.13 2011/10/09 18:23:00 christos Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regex2.h	8.4 (Berkeley) 3/20/94
+ */
+
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regex2.h	8.4 (Berkeley) 3/20/94
+ */
+
+/*
+ * First, the stuff that ends up in the outside-world include file
+ = typedef off_t regoff_t;
+ = typedef struct {
+ = 	int re_magic;
+ = 	size_t re_nsub;		// number of parenthesized subexpressions
+ = 	const char *re_endp;	// end pointer for REG_PEND
+ = 	struct re_guts *re_g;	// none of your business :-)
+ = } regex_t;
+ = typedef struct {
+ = 	regoff_t rm_so;		// start of match
+ = 	regoff_t rm_eo;		// end of match
+ = } regmatch_t;
+ */
+/*
+ * internals of regex_t
+ */
+#define	MAGIC1	((('r'^0200)<<8) | 'e')
+
+/*
+ * The internal representation is a *strip*, a sequence of
+ * operators ending with an endmarker.  (Some terminology etc. is a
+ * historical relic of earlier versions which used multiple strips.)
+ * Certain oddities in the representation are there to permit running
+ * the machinery backwards; in particular, any deviation from sequential
+ * flow must be marked at both its source and its destination.  Some
+ * fine points:
+ *
+ * - OPLUS_ and O_PLUS are *inside* the loop they create.
+ * - OQUEST_ and O_QUEST are *outside* the bypass they create.
+ * - OCH_ and O_CH are *outside* the multi-way branch they create, while
+ *   OOR1 and OOR2 are respectively the end and the beginning of one of
+ *   the branches.  Note that there is an implicit OOR2 following OCH_
+ *   and an implicit OOR1 preceding O_CH.
+ *
+ * In state representations, an operator's bit is on to signify a state
+ * immediately *preceding* "execution" of that operator.
+ */
+typedef u_int32_t sop;	/* strip operator */
+typedef size_t sopno;
+#define	OPRMASK	((u_int32_t)0xf8000000UL)
+#define	OPDMASK	((u_int32_t)0x07ffffffUL)
+#define	OPSHIFT	((unsigned)27)
+#define	OP(n)	((n)&OPRMASK)
+#define	OPND(n)	((int)((n)&OPDMASK))
+#define	SOP(op, opnd)	((op)|(opnd))
+
+#define OPC(n)	(((u_int32_t)(n))<<OPSHIFT)
+/* operators		   meaning	operand			*/
+/*					(back, fwd are offsets)	*/
+#define	OEND	OPC(1)	/* endmarker	-			*/
+#define	OCHAR	OPC(2)	/* character	unsigned char		*/
+#define	OBOL	OPC(3)	/* left anchor	-			*/
+#define	OEOL	OPC(4)	/* right anchor	-			*/
+#define	OANY	OPC(5)	/* .		-			*/
+#define	OANYOF	OPC(6)	/* [...]	set number		*/
+#define	OBACK_	OPC(7)	/* begin \d	paren number		*/
+#define	O_BACK	OPC(8)	/* end \d	paren number		*/
+#define	OPLUS_	OPC(9)	/* + prefix	fwd to suffix		*/
+#define	O_PLUS	OPC(10)	/* + suffix	back to prefix		*/
+#define	OQUEST_	OPC(11)	/* ? prefix	fwd to suffix		*/
+#define	O_QUEST	OPC(12)	/* ? suffix	back to prefix		*/
+#define	OLPAREN	OPC(13)	/* (		fwd to )		*/
+#define	ORPAREN	OPC(14)	/* )		back to (		*/
+#define	OCH_	OPC(15)	/* begin choice	fwd to OOR2		*/
+#define	OOR1	OPC(16)	/* | pt. 1	back to OOR1 or OCH_	*/
+#define	OOR2	OPC(17)	/* | pt. 2	fwd to OOR2 or O_CH	*/
+#define	O_CH	OPC(18)	/* end choice	back to OOR1		*/
+#define	OBOW	OPC(19)	/* begin word	-			*/
+#define	OEOW	OPC(20)	/* end word	-			*/
+
+/*
+ * Structure for [] character-set representation.  Character sets are
+ * done as bit vectors, grouped 8 to a byte vector for compactness.
+ * The individual set therefore has both a pointer to the byte vector
+ * and a mask to pick out the relevant bit of each byte.  A hash code
+ * simplifies testing whether two sets could be identical.
+ *
+ * This will get trickier for multicharacter collating elements.  As
+ * preliminary hooks for dealing with such things, we also carry along
+ * a string of multi-character elements, and decide the size of the
+ * vectors at run time.
+ */
+typedef struct {
+	uch *ptr;		/* -> uch [csetsize] */
+	uch mask;		/* bit within array */
+	uch hash;		/* hash code */
+	size_t smultis;
+	char *multis;		/* -> char[smulti]  ab\0cd\0ef\0\0 */
+} cset;
+/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
+#define	CHadd(cs, c)	((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
+#define	CHsub(cs, c)	((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
+#define	CHIN(cs, c)	((cs)->ptr[(uch)(c)] & (cs)->mask)
+#define	MCadd(p, cs, cp)	mcadd(p, cs, cp)	/* regcomp() internal fns */
+#define	MCsub(p, cs, cp)	mcsub(p, cs, cp)
+#define	MCin(p, cs, cp)	mcin(p, cs, cp)
+
+/* stuff for character categories */
+typedef unsigned char cat_t;
+
+/*
+ * main compiled-expression structure
+ */
+struct re_guts {
+	int magic;
+#		define	MAGIC2	((('R'^0200)<<8)|'E')
+	sop *strip;		/* malloced area for strip */
+	size_t csetsize;	/* number of bits in a cset vector */
+	size_t ncsets;		/* number of csets in use */
+	cset *sets;		/* -> cset [ncsets] */
+	uch *setbits;		/* -> uch[csetsize][ncsets/CHAR_BIT] */
+	int cflags;		/* copy of regcomp() cflags argument */
+	sopno nstates;		/* = number of sops */
+	sopno firststate;	/* the initial OEND (normally 0) */
+	sopno laststate;	/* the final OEND */
+	int iflags;		/* internal flags */
+#		define	USEBOL	01	/* used ^ */
+#		define	USEEOL	02	/* used $ */
+#		define	BAD	04	/* something wrong */
+	size_t nbol;		/* number of ^ used */
+	size_t neol;		/* number of $ used */
+	size_t ncategories;	/* how many character categories */
+	cat_t *categories;	/* ->catspace[-CHAR_MIN] */
+	char *must;		/* match must contain this string */
+	size_t mlen;		/* length of must */
+	size_t nsub;		/* copy of re_nsub */
+	int backrefs;		/* does it use back references? */
+	sopno nplus;		/* how deep does it nest +s? */
+	/* catspace must be last */
+	cat_t catspace[1];	/* actually [NC] */
+};
+
+/* misc utilities */
+#define	OUT	(CHAR_MAX+1)	/* a non-character value */
+#define	ISWORD(c)	(isalnum((unsigned char)c) || (c) == '_')
diff --git a/libc/upstream-netbsd/libc/regex/regexec.c b/libc/upstream-netbsd/libc/regex/regexec.c
new file mode 100644
index 0000000..f16e0b6
--- /dev/null
+++ b/libc/upstream-netbsd/libc/regex/regexec.c
@@ -0,0 +1,234 @@
+/*	$NetBSD: regexec.c,v 1.22 2012/03/13 21:13:43 christos Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regexec.c	8.3 (Berkeley) 3/20/94
+ */
+
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regexec.c	8.3 (Berkeley) 3/20/94
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)regexec.c	8.3 (Berkeley) 3/20/94";
+#else
+__RCSID("$NetBSD: regexec.c,v 1.22 2012/03/13 21:13:43 christos Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * the outer shell of regexec()
+ *
+ * This file includes engine.c *twice*, after muchos fiddling with the
+ * macros that code uses.  This lets the same code operate on two different
+ * representations for state sets.
+ */
+#include "namespace.h"
+#include <sys/types.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <regex.h>
+
+#ifdef __weak_alias
+__weak_alias(regexec,_regexec)
+#endif
+
+#include "utils.h"
+#include "regex2.h"
+
+/* macros for manipulating states, small version */
+#define	states	unsigned long
+#define	states1	unsigned long	/* for later use in regexec() decision */
+#define	CLEAR(v)	((v) = 0)
+#define	SET0(v, n)	((v) &= ~((unsigned long)1 << (n)))
+#define	SET1(v, n)	((v) |= (unsigned long)1 << (n))
+#define	ISSET(v, n)	(((v) & ((unsigned long)1 << (n))) != 0)
+#define	ASSIGN(d, s)	((d) = (s))
+#define	EQ(a, b)	((a) == (b))
+#define	STATEVARS	int dummy	/* dummy version */
+#define	STATESETUP(m, n)	/* nothing */
+#define	STATETEARDOWN(m)	/* nothing */
+#define	SETUP(v)	((v) = 0)
+#define	onestate	unsigned long
+#define	INIT(o, n)	((o) = (unsigned long)1 << (n))
+#define	INC(o)	((o) <<= 1)
+#define	ISSTATEIN(v, o)	(((v) & (o)) != 0)
+/* some abbreviations; note that some of these know variable names! */
+/* do "if I'm here, I can also be there" etc without branches */
+#define	FWD(dst, src, n)	((dst) |= ((unsigned long)(src)&(here)) << (n))
+#define	BACK(dst, src, n)	((dst) |= ((unsigned long)(src)&(here)) >> (n))
+#define	ISSETBACK(v, n)	(((v) & ((unsigned long)here >> (n))) != 0)
+/* function names */
+#define SNAMES			/* engine.c looks after details */
+
+#include "engine.c"
+
+/* now undo things */
+#undef	states
+#undef	CLEAR
+#undef	SET0
+#undef	SET1
+#undef	ISSET
+#undef	ASSIGN
+#undef	EQ
+#undef	STATEVARS
+#undef	STATESETUP
+#undef	STATETEARDOWN
+#undef	SETUP
+#undef	onestate
+#undef	INIT
+#undef	INC
+#undef	ISSTATEIN
+#undef	FWD
+#undef	BACK
+#undef	ISSETBACK
+#undef	SNAMES
+
+/* macros for manipulating states, large version */
+#define	states	char *
+#define	CLEAR(v)	memset(v, 0, (size_t)m->g->nstates)
+#define	SET0(v, n)	((v)[n] = 0)
+#define	SET1(v, n)	((v)[n] = 1)
+#define	ISSET(v, n)	((v)[n])
+#define	ASSIGN(d, s)	memcpy(d, s, (size_t)m->g->nstates)
+#define	EQ(a, b)	(memcmp(a, b, (size_t)m->g->nstates) == 0)
+#define	STATEVARS	int vn; char *space
+#define	STATESETUP(m, nv) \
+    if (((m)->space = malloc((size_t)((nv)*(m)->g->nstates))) == NULL) \
+	return(REG_ESPACE); \
+    else \
+	(m)->vn = 0
+
+#define	STATETEARDOWN(m)	{ free((m)->space); m->space = NULL; }
+#define	SETUP(v)	((v) = &m->space[(size_t)(m->vn++ * m->g->nstates)])
+#define	onestate	int
+#define	INIT(o, n)	((o) = (int)(n))
+#define	INC(o)	((o)++)
+#define	ISSTATEIN(v, o)	((v)[o])
+/* some abbreviations; note that some of these know variable names! */
+/* do "if I'm here, I can also be there" etc without branches */
+#define	FWD(dst, src, n)	((dst)[here+(n)] |= (src)[here])
+#define	BACK(dst, src, n)	((dst)[here-(n)] |= (src)[here])
+#define	ISSETBACK(v, n)	((v)[here - (n)])
+/* function names */
+#define	LNAMES			/* flag */
+
+#include "engine.c"
+
+/*
+ - regexec - interface for matching
+ = extern int regexec(const regex_t *, const char *, size_t, \
+ =					regmatch_t [], int);
+ = #define	REG_NOTBOL	00001
+ = #define	REG_NOTEOL	00002
+ = #define	REG_STARTEND	00004
+ = #define	REG_TRACE	00400	// tracing of execution
+ = #define	REG_LARGE	01000	// force large representation
+ = #define	REG_BACKR	02000	// force use of backref code
+ *
+ * We put this here so we can exploit knowledge of the state representation
+ * when choosing which matcher to call.  Also, by this point the matchers
+ * have been prototyped.
+ */
+int				/* 0 success, REG_NOMATCH failure */
+regexec(
+    const regex_t *preg,
+    const char *string,
+    size_t nmatch,
+    regmatch_t pmatch[],
+    int eflags)
+{
+	struct re_guts *g = preg->re_g;
+	char *s;
+#ifdef REDEBUG
+#	define	GOODFLAGS(f)	(f)
+#else
+#	define	GOODFLAGS(f)	((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND))
+#endif
+
+	_DIAGASSERT(preg != NULL);
+	_DIAGASSERT(string != NULL);
+
+	if (preg->re_magic != MAGIC1 || g->magic != MAGIC2)
+		return(REG_BADPAT);
+	assert(!(g->iflags&BAD));
+	if (g->iflags&BAD)		/* backstop for no-debug case */
+		return(REG_BADPAT);
+	eflags = GOODFLAGS(eflags);
+
+	s = __UNCONST(string);
+
+	if (g->nstates <= (sopno)(CHAR_BIT*sizeof(states1)) && !(eflags&REG_LARGE))
+		return(smatcher(g, s, nmatch, pmatch, eflags));
+	else
+		return(lmatcher(g, s, nmatch, pmatch, eflags));
+}
diff --git a/libc/upstream-netbsd/libc/regex/regfree.c b/libc/upstream-netbsd/libc/regex/regfree.c
new file mode 100644
index 0000000..ce011ea
--- /dev/null
+++ b/libc/upstream-netbsd/libc/regex/regfree.c
@@ -0,0 +1,129 @@
+/*	$NetBSD: regfree.c,v 1.15 2007/02/09 23:44:18 junyoung Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regfree.c	8.3 (Berkeley) 3/20/94
+ */
+
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)regfree.c	8.3 (Berkeley) 3/20/94
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)regfree.c	8.3 (Berkeley) 3/20/94";
+#else
+__RCSID("$NetBSD: regfree.c,v 1.15 2007/02/09 23:44:18 junyoung Exp $");
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
+#include <sys/types.h>
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <regex.h>
+
+#ifdef __weak_alias
+__weak_alias(regfree,_regfree)
+#endif
+
+#include "utils.h"
+#include "regex2.h"
+
+/*
+ - regfree - free everything
+ = extern void regfree(regex_t *);
+ */
+void
+regfree(
+    regex_t *preg)
+{
+	struct re_guts *g;
+
+	_DIAGASSERT(preg != NULL);
+
+	_DIAGASSERT(preg->re_magic == MAGIC1);
+	if (preg->re_magic != MAGIC1)	/* oops */
+		return;			/* nice to complain, but hard */
+
+	g = preg->re_g;
+	if (g == NULL || g->magic != MAGIC2)	/* oops again */
+		return;
+	preg->re_magic = 0;		/* mark it invalid */
+	g->magic = 0;			/* mark it invalid */
+
+	if (g->strip != NULL)
+		free(g->strip);
+	if (g->sets != NULL)
+		free(g->sets);
+	if (g->setbits != NULL)
+		free(g->setbits);
+	if (g->must != NULL)
+		free(g->must);
+	free(g);
+}
diff --git a/libc/upstream-netbsd/libc/regex/utils.h b/libc/upstream-netbsd/libc/regex/utils.h
new file mode 100644
index 0000000..762caee
--- /dev/null
+++ b/libc/upstream-netbsd/libc/regex/utils.h
@@ -0,0 +1,91 @@
+/*	$NetBSD: utils.h,v 1.6 2003/08/07 16:43:21 agc Exp $	*/
+
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)utils.h	8.3 (Berkeley) 3/20/94
+ */
+
+/*-
+ * Copyright (c) 1992, 1993, 1994 Henry Spencer.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Henry Spencer.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)utils.h	8.3 (Berkeley) 3/20/94
+ */
+
+/* utility definitions */
+#define	DUPMAX		_POSIX2_RE_DUP_MAX	/* xxx is this right? */
+#define	INFINITY	(DUPMAX + 1)
+#define	NC		(CHAR_MAX - CHAR_MIN + 1)
+typedef unsigned char uch;
+
+/* switch off assertions (if not already off) if no REDEBUG */
+#ifndef REDEBUG
+#ifndef NDEBUG
+#define	NDEBUG	/* no assertions please */
+#endif
+#endif
+#include <assert.h>
+
+/* for old systems with bcopy() but no memmove() */
+#ifdef USEBCOPY
+#define	memmove(d, s, c)	bcopy(s, d, c)
+#endif
diff --git a/libc/upstream-netbsd/netbsd-compat.h b/libc/upstream-netbsd/netbsd-compat.h
index a52052a..3833c1d 100644
--- a/libc/upstream-netbsd/netbsd-compat.h
+++ b/libc/upstream-netbsd/netbsd-compat.h
@@ -21,4 +21,7 @@
 #include <assert.h>
 #define _DIAGASSERT(e) ((e) ? (void) 0 : __assert2(__FILE__, __LINE__, __func__, #e))
 
+// TODO: update our <sys/cdefs.h> to support this properly.
+#define __type_fit(t, a) (0 == 0)
+
 #endif