| /*- |
| * Copyright (c) 1990 The Regents of the University of California. |
| * All rights reserved. |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Chris Torek. |
| * |
| * 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. |
| */ |
| |
| #include <sys/mman.h> |
| #include <sys/types.h> |
| |
| #include <errno.h> |
| #include <float.h> |
| #include <langinfo.h> |
| #include <limits.h> |
| #include <locale.h> |
| #include <math.h> |
| #include <stdarg.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <wchar.h> |
| |
| #include <platform/bionic/macros.h> |
| |
| #include "fvwrite.h" |
| #include "gdtoa.h" |
| #include "local.h" |
| |
| union arg { |
| int intarg; |
| unsigned int uintarg; |
| long longarg; |
| unsigned long ulongarg; |
| long long longlongarg; |
| unsigned long long ulonglongarg; |
| ptrdiff_t ptrdiffarg; |
| size_t sizearg; |
| ssize_t ssizearg; |
| intmax_t intmaxarg; |
| uintmax_t uintmaxarg; |
| void* pvoidarg; |
| char* pchararg; |
| signed char* pschararg; |
| short* pshortarg; |
| int* pintarg; |
| long* plongarg; |
| long long* plonglongarg; |
| ptrdiff_t* pptrdiffarg; |
| ssize_t* pssizearg; |
| intmax_t* pintmaxarg; |
| double doublearg; |
| long double longdoublearg; |
| wint_t wintarg; |
| wchar_t* pwchararg; |
| }; |
| |
| // Helper function for `fprintf to unbuffered unix file': creates a |
| // temporary buffer. We only work on write-only files; this avoids |
| // worries about ungetc buffers and so forth. |
| static int __sbprintf(FILE* fp, const CHAR_TYPE* fmt, va_list ap) { |
| FILE fake; |
| struct __sfileext fakeext; |
| unsigned char buf[BUFSIZ]; |
| |
| _FILEEXT_SETUP(&fake, &fakeext); |
| /* copy the important variables */ |
| fake._flags = fp->_flags & ~__SNBF; |
| fake._file = fp->_file; |
| fake._cookie = fp->_cookie; |
| fake._write = fp->_write; |
| |
| /* set up the buffer */ |
| fake._bf._base = fake._p = buf; |
| fake._bf._size = fake._w = sizeof(buf); |
| fake._lbfsize = 0; /* not actually used, but Just In Case */ |
| |
| /* do the work, then copy any error status */ |
| int ret = FUNCTION_NAME(&fake, fmt, ap); |
| if (ret >= 0 && __sflush(&fake)) ret = EOF; |
| if (fake._flags & __SERR) fp->_flags |= __SERR; |
| return ret; |
| } |
| |
| static int __find_arguments(const CHAR_TYPE* fmt0, va_list ap, union arg** argtable, size_t* argtablesiz); |
| static int __grow_type_table(unsigned char** typetable, int* tablesize); |
| |
| #define DEFPREC 6 |
| |
| #define to_digit(c) ((c) - '0') |
| #define is_digit(c) ((unsigned)to_digit(c) <= 9) |
| #define to_char(n) ((CHAR_TYPE)((n) + '0')) |
| |
| template <typename CharT> |
| static int exponent(CharT* p0, int exp, int fmtch) { |
| CharT* p = p0; |
| *p++ = fmtch; |
| if (exp < 0) { |
| exp = -exp; |
| *p++ = '-'; |
| } else { |
| *p++ = '+'; |
| } |
| |
| CharT expbuf[MAXEXPDIG]; |
| CharT* t = expbuf + MAXEXPDIG; |
| if (exp > 9) { |
| do { |
| *--t = to_char(exp % 10); |
| } while ((exp /= 10) > 9); |
| *--t = to_char(exp); |
| for (; t < expbuf + MAXEXPDIG; *p++ = *t++) /* nothing */; |
| } else { |
| /* |
| * Exponents for decimal floating point conversions |
| * (%[eEgG]) must be at least two characters long, |
| * whereas exponents for hexadecimal conversions can |
| * be only one character long. |
| */ |
| if (fmtch == 'e' || fmtch == 'E') *p++ = '0'; |
| *p++ = to_char(exp); |
| } |
| return (p - p0); |
| } |
| |
| #define PAD(howmany, with) \ |
| do { \ |
| if ((n = (howmany)) > 0) { \ |
| while (n > PADSIZE) { \ |
| PRINT(with, PADSIZE); \ |
| n -= PADSIZE; \ |
| } \ |
| PRINT(with, n); \ |
| } \ |
| } while (0) |
| |
| #define PRINTANDPAD(p, ep, len, with) \ |
| do { \ |
| n2 = (ep) - (p); \ |
| if (n2 > (len)) n2 = (len); \ |
| if (n2 > 0) PRINT((p), n2); \ |
| PAD((len) - (n2 > 0 ? n2 : 0), (with)); \ |
| } while (0) |
| |
| /* |
| * The size of the buffer we use as scratch space for integer |
| * conversions, among other things. Technically, we would need the |
| * most space for base 10 conversions with thousands' grouping |
| * characters between each pair of digits. 100 bytes is a |
| * conservative overestimate even for a 128-bit uintmax_t. |
| */ |
| #define BUF 100 |
| |
| #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */ |
| |
| /* |
| * Flags used during conversion. |
| */ |
| #define ALT 0x0001 /* alternate form */ |
| #define LADJUST 0x0004 /* left adjustment */ |
| #define LONGDBL 0x0008 /* long double */ |
| #define LONGINT 0x0010 /* long integer */ |
| #define LLONGINT 0x0020 /* long long integer */ |
| #define SHORTINT 0x0040 /* short integer */ |
| #define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */ |
| #define FPT 0x0100 /* Floating point number */ |
| #define PTRINT 0x0200 /* (unsigned) ptrdiff_t */ |
| #define SIZEINT 0x0400 /* (signed) size_t */ |
| #define CHARINT 0x0800 /* 8 bit integer */ |
| #define MAXINT 0x1000 /* largest integer size (intmax_t) */ |
| |
| /* |
| * Type ids for argument type table. |
| */ |
| #define T_UNUSED 0 |
| #define T_SHORT 1 |
| #define T_U_SHORT 2 |
| #define TP_SHORT 3 |
| #define T_INT 4 |
| #define T_U_INT 5 |
| #define TP_INT 6 |
| #define T_LONG 7 |
| #define T_U_LONG 8 |
| #define TP_LONG 9 |
| #define T_LLONG 10 |
| #define T_U_LLONG 11 |
| #define TP_LLONG 12 |
| #define T_DOUBLE 13 |
| #define T_LONG_DOUBLE 14 |
| #define TP_CHAR 15 |
| #define TP_VOID 16 |
| #define T_PTRINT 17 |
| #define TP_PTRINT 18 |
| #define T_SIZEINT 19 |
| #define T_SSIZEINT 20 |
| #define TP_SSIZEINT 21 |
| #define T_MAXINT 22 |
| #define T_MAXUINT 23 |
| #define TP_MAXINT 24 |
| #define T_CHAR 25 |
| #define T_U_CHAR 26 |
| #define T_WINT 27 |
| #define TP_WCHAR 28 |
| |
| // To extend shorts properly, we need both signed and unsigned |
| // argument extraction methods. |
| #define SARG() \ |
| ((intmax_t)(flags & MAXINT \ |
| ? GETARG(intmax_t) \ |
| : flags & LLONGINT \ |
| ? GETARG(long long) \ |
| : flags & LONGINT \ |
| ? GETARG(long) \ |
| : flags & PTRINT \ |
| ? GETARG(ptrdiff_t) \ |
| : flags & SIZEINT \ |
| ? GETARG(ssize_t) \ |
| : flags & SHORTINT \ |
| ? (short)GETARG(int) \ |
| : flags & CHARINT ? (signed char)GETARG(int) \ |
| : GETARG(int))) |
| #define UARG() \ |
| ((uintmax_t)(flags & MAXINT \ |
| ? GETARG(uintmax_t) \ |
| : flags & LLONGINT \ |
| ? GETARG(unsigned long long) \ |
| : flags & LONGINT \ |
| ? GETARG(unsigned long) \ |
| : flags & PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \ |
| flags & SIZEINT \ |
| ? GETARG(size_t) \ |
| : flags & SHORTINT \ |
| ? (unsigned short)GETARG(int) \ |
| : flags & CHARINT ? (unsigned char)GETARG(int) \ |
| : GETARG(unsigned int))) |
| |
| // Append a digit to a value and check for overflow. |
| #define APPEND_DIGIT(val, dig) \ |
| do { \ |
| if ((val) > INT_MAX / 10) goto overflow; \ |
| (val) *= 10; \ |
| if ((val) > INT_MAX - to_digit((dig))) goto overflow; \ |
| (val) += to_digit((dig)); \ |
| } while (0) |
| |
| // Get * arguments, including the form *nn$. Preserve the nextarg |
| // that the argument can be gotten once the type is determined. |
| #define GETASTER(val) \ |
| n2 = 0; \ |
| cp = fmt; \ |
| while (is_digit(*cp)) { \ |
| APPEND_DIGIT(n2, *cp); \ |
| cp++; \ |
| } \ |
| if (*cp == '$') { \ |
| int hold = nextarg; \ |
| if (argtable == NULL) { \ |
| argtable = statargtable; \ |
| if (__find_arguments(fmt0, orgap, &argtable, &argtablesiz) == -1) { \ |
| ret = -1; \ |
| goto error; \ |
| } \ |
| } \ |
| nextarg = n2; \ |
| val = GETARG(int); \ |
| nextarg = hold; \ |
| fmt = ++cp; \ |
| } else { \ |
| val = GETARG(int); \ |
| } |
| |
| // Get the argument indexed by nextarg. If the argument table is |
| // built, use it to get the argument. If its not, get the next |
| // argument (and arguments must be gotten sequentially). |
| #define GETARG(type) \ |
| ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : (nextarg++, va_arg(ap, type))) |
| |
| /* |
| * Find all arguments when a positional parameter is encountered. Returns a |
| * table, indexed by argument number, of pointers to each arguments. The |
| * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries. |
| * It will be replaced with a mmap-ed one if it overflows (malloc cannot be |
| * used since we are attempting to make snprintf thread safe, and alloca is |
| * problematic since we have nested functions..) |
| */ |
| static int __find_arguments(const CHAR_TYPE* fmt0, va_list ap, union arg** argtable, |
| size_t* argtablesiz) { |
| int ch; /* character from fmt */ |
| int n, n2; /* handy integer (short term usage) */ |
| int flags; /* flags as above */ |
| unsigned char* typetable; /* table of types */ |
| unsigned char stattypetable[STATIC_ARG_TBL_SIZE]; |
| int tablesize; /* current size of type table */ |
| int tablemax; /* largest used index in table */ |
| int nextarg; /* 1-based argument index */ |
| int ret = 0; /* return value */ |
| |
| /* |
| * Add an argument type to the table, expanding if necessary. |
| */ |
| #define ADDTYPE(type) \ |
| ((nextarg >= tablesize) ? __grow_type_table(&typetable, &tablesize) : 0, \ |
| (nextarg > tablemax) ? tablemax = nextarg : 0, typetable[nextarg++] = type) |
| |
| #define ADDSARG() \ |
| ((flags & MAXINT) \ |
| ? ADDTYPE(T_MAXINT) \ |
| : ((flags & PTRINT) ? ADDTYPE(T_PTRINT) \ |
| : ((flags & SIZEINT) \ |
| ? ADDTYPE(T_SSIZEINT) \ |
| : ((flags & LLONGINT) \ |
| ? ADDTYPE(T_LLONG) \ |
| : ((flags & LONGINT) \ |
| ? ADDTYPE(T_LONG) \ |
| : ((flags & SHORTINT) \ |
| ? ADDTYPE(T_SHORT) \ |
| : ((flags & CHARINT) ? ADDTYPE(T_CHAR) \ |
| : ADDTYPE(T_INT)))))))) |
| |
| #define ADDUARG() \ |
| ((flags & MAXINT) \ |
| ? ADDTYPE(T_MAXUINT) \ |
| : ((flags & PTRINT) \ |
| ? ADDTYPE(T_PTRINT) \ |
| : ((flags & SIZEINT) \ |
| ? ADDTYPE(T_SIZEINT) \ |
| : ((flags & LLONGINT) \ |
| ? ADDTYPE(T_U_LLONG) \ |
| : ((flags & LONGINT) \ |
| ? ADDTYPE(T_U_LONG) \ |
| : ((flags & SHORTINT) \ |
| ? ADDTYPE(T_U_SHORT) \ |
| : ((flags & CHARINT) ? ADDTYPE(T_U_CHAR) \ |
| : ADDTYPE(T_U_INT)))))))) |
| |
| /* |
| * Add * arguments to the type array. |
| */ |
| #define ADDASTER() \ |
| n2 = 0; \ |
| cp = fmt; \ |
| while (is_digit(*cp)) { \ |
| APPEND_DIGIT(n2, *cp); \ |
| cp++; \ |
| } \ |
| if (*cp == '$') { \ |
| int hold = nextarg; \ |
| nextarg = n2; \ |
| ADDTYPE(T_INT); \ |
| nextarg = hold; \ |
| fmt = ++cp; \ |
| } else { \ |
| ADDTYPE(T_INT); \ |
| } |
| CHAR_TYPE* fmt = const_cast<CHAR_TYPE*>(fmt0); |
| CHAR_TYPE* cp; |
| typetable = stattypetable; |
| tablesize = STATIC_ARG_TBL_SIZE; |
| tablemax = 0; |
| nextarg = 1; |
| memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE); |
| |
| /* |
| * Scan the format for conversions (`%' character). |
| */ |
| for (;;) { |
| for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++) continue; |
| if (ch == '\0') goto done; |
| fmt++; /* skip over '%' */ |
| |
| flags = 0; |
| |
| rflag: |
| ch = *fmt++; |
| reswitch: |
| switch (ch) { |
| case ' ': |
| case '#': |
| case '\'': |
| goto rflag; |
| case '*': |
| ADDASTER(); |
| goto rflag; |
| case '-': |
| case '+': |
| goto rflag; |
| case '.': |
| if ((ch = *fmt++) == '*') { |
| ADDASTER(); |
| goto rflag; |
| } |
| while (is_digit(ch)) { |
| ch = *fmt++; |
| } |
| goto reswitch; |
| case '0': |
| goto rflag; |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| case '8': |
| case '9': |
| n = 0; |
| do { |
| APPEND_DIGIT(n, ch); |
| ch = *fmt++; |
| } while (is_digit(ch)); |
| if (ch == '$') { |
| nextarg = n; |
| goto rflag; |
| } |
| goto reswitch; |
| case 'L': |
| flags |= LONGDBL; |
| goto rflag; |
| case 'h': |
| if (*fmt == 'h') { |
| fmt++; |
| flags |= CHARINT; |
| } else { |
| flags |= SHORTINT; |
| } |
| goto rflag; |
| case 'j': |
| flags |= MAXINT; |
| goto rflag; |
| case 'l': |
| if (*fmt == 'l') { |
| fmt++; |
| flags |= LLONGINT; |
| } else { |
| flags |= LONGINT; |
| } |
| goto rflag; |
| case 'q': |
| flags |= LLONGINT; |
| goto rflag; |
| case 't': |
| flags |= PTRINT; |
| goto rflag; |
| case 'z': |
| flags |= SIZEINT; |
| goto rflag; |
| case 'C': |
| flags |= LONGINT; |
| __BIONIC_FALLTHROUGH; |
| case 'c': |
| if (flags & LONGINT) |
| ADDTYPE(T_WINT); |
| else |
| ADDTYPE(T_INT); |
| break; |
| case 'D': |
| flags |= LONGINT; |
| __BIONIC_FALLTHROUGH; |
| case 'd': |
| case 'i': |
| ADDSARG(); |
| break; |
| case 'a': |
| case 'A': |
| case 'e': |
| case 'E': |
| case 'f': |
| case 'F': |
| case 'g': |
| case 'G': |
| if (flags & LONGDBL) |
| ADDTYPE(T_LONG_DOUBLE); |
| else |
| ADDTYPE(T_DOUBLE); |
| break; |
| case 'n': |
| __fortify_fatal("%%n not allowed on Android"); |
| case 'O': |
| flags |= LONGINT; |
| __BIONIC_FALLTHROUGH; |
| case 'o': |
| ADDUARG(); |
| break; |
| case 'p': |
| ADDTYPE(TP_VOID); |
| break; |
| case 'S': |
| flags |= LONGINT; |
| __BIONIC_FALLTHROUGH; |
| case 's': |
| ADDTYPE((flags & LONGINT) ? TP_WCHAR : TP_CHAR); |
| break; |
| case 'U': |
| flags |= LONGINT; |
| __BIONIC_FALLTHROUGH; |
| case 'u': |
| case 'X': |
| case 'x': |
| case 'B': |
| case 'b': |
| ADDUARG(); |
| break; |
| default: /* "%?" prints ?, unless ? is NUL */ |
| if (ch == '\0') goto done; |
| break; |
| } |
| } |
| done: |
| /* |
| * Build the argument table. |
| */ |
| if (tablemax >= STATIC_ARG_TBL_SIZE) { |
| *argtablesiz = sizeof(union arg) * (tablemax + 1); |
| *argtable = static_cast<arg*>(mmap(nullptr, *argtablesiz, |
| PROT_WRITE | PROT_READ, |
| MAP_ANON | MAP_PRIVATE, -1, 0)); |
| if (*argtable == MAP_FAILED) return -1; |
| } |
| |
| for (n = 1; n <= tablemax; n++) { |
| switch (typetable[n]) { |
| case T_UNUSED: |
| case T_CHAR: |
| case T_U_CHAR: |
| case T_SHORT: |
| case T_U_SHORT: |
| case T_INT: |
| (*argtable)[n].intarg = va_arg(ap, int); |
| break; |
| case TP_SHORT: |
| (*argtable)[n].pshortarg = va_arg(ap, short*); |
| break; |
| case T_U_INT: |
| (*argtable)[n].uintarg = va_arg(ap, unsigned int); |
| break; |
| case TP_INT: |
| (*argtable)[n].pintarg = va_arg(ap, int*); |
| break; |
| case T_LONG: |
| (*argtable)[n].longarg = va_arg(ap, long); |
| break; |
| case T_U_LONG: |
| (*argtable)[n].ulongarg = va_arg(ap, unsigned long); |
| break; |
| case TP_LONG: |
| (*argtable)[n].plongarg = va_arg(ap, long*); |
| break; |
| case T_LLONG: |
| (*argtable)[n].longlongarg = va_arg(ap, long long); |
| break; |
| case T_U_LLONG: |
| (*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long); |
| break; |
| case TP_LLONG: |
| (*argtable)[n].plonglongarg = va_arg(ap, long long*); |
| break; |
| case T_DOUBLE: |
| (*argtable)[n].doublearg = va_arg(ap, double); |
| break; |
| case T_LONG_DOUBLE: |
| (*argtable)[n].longdoublearg = va_arg(ap, long double); |
| break; |
| case TP_CHAR: |
| (*argtable)[n].pchararg = va_arg(ap, char*); |
| break; |
| case TP_VOID: |
| (*argtable)[n].pvoidarg = va_arg(ap, void*); |
| break; |
| case T_PTRINT: |
| (*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t); |
| break; |
| case TP_PTRINT: |
| (*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t*); |
| break; |
| case T_SIZEINT: |
| (*argtable)[n].sizearg = va_arg(ap, size_t); |
| break; |
| case T_SSIZEINT: |
| (*argtable)[n].ssizearg = va_arg(ap, ssize_t); |
| break; |
| case TP_SSIZEINT: |
| (*argtable)[n].pssizearg = va_arg(ap, ssize_t*); |
| break; |
| case T_MAXINT: |
| (*argtable)[n].intmaxarg = va_arg(ap, intmax_t); |
| break; |
| case T_MAXUINT: |
| (*argtable)[n].uintmaxarg = va_arg(ap, uintmax_t); |
| break; |
| case TP_MAXINT: |
| (*argtable)[n].pintmaxarg = va_arg(ap, intmax_t*); |
| break; |
| case T_WINT: |
| (*argtable)[n].wintarg = va_arg(ap, wint_t); |
| break; |
| case TP_WCHAR: |
| (*argtable)[n].pwchararg = va_arg(ap, wchar_t*); |
| break; |
| } |
| } |
| goto finish; |
| |
| overflow: |
| errno = ENOMEM; |
| ret = -1; |
| |
| finish: |
| if (typetable != nullptr && typetable != stattypetable) { |
| munmap(typetable, *argtablesiz); |
| typetable = nullptr; |
| } |
| return (ret); |
| } |
| |
| /* |
| * Increase the size of the type table. |
| */ |
| static int __grow_type_table(unsigned char** typetable, int* tablesize) { |
| unsigned char* old_table = *typetable; |
| int new_size = *tablesize * 2; |
| |
| if (new_size < getpagesize()) new_size = getpagesize(); |
| |
| if (*tablesize == STATIC_ARG_TBL_SIZE) { |
| *typetable = static_cast<unsigned char*>(mmap(nullptr, new_size, |
| PROT_WRITE | PROT_READ, |
| MAP_ANON | MAP_PRIVATE, -1, 0)); |
| if (*typetable == MAP_FAILED) return -1; |
| bcopy(old_table, *typetable, *tablesize); |
| } else { |
| unsigned char* new_table = static_cast<unsigned char*>(mmap(nullptr, new_size, |
| PROT_WRITE | PROT_READ, |
| MAP_ANON | MAP_PRIVATE, -1, 0)); |
| if (new_table == MAP_FAILED) return -1; |
| memmove(new_table, *typetable, *tablesize); |
| munmap(*typetable, *tablesize); |
| *typetable = new_table; |
| } |
| memset(*typetable + *tablesize, T_UNUSED, (new_size - *tablesize)); |
| |
| *tablesize = new_size; |
| return 0; |
| } |
| |
| struct helpers { |
| // Flush out all the vectors defined by the given uio, |
| // then reset it so that it can be reused. |
| static int sprint(FILE* fp, struct __suio* uio) { |
| if (uio->uio_resid == 0) { |
| uio->uio_iovcnt = 0; |
| return 0; |
| } |
| int result = __sfvwrite(fp, uio); |
| uio->uio_resid = 0; |
| uio->uio_iovcnt = 0; |
| return result; |
| } |
| |
| // Convert a wide character string argument for the %ls format to a multibyte |
| // string representation. If not -1, prec specifies the maximum number of |
| // bytes to output, and also means that we can't assume that the wide char |
| // string is null-terminated. |
| static char* wcsconv(wchar_t* wcsarg, int prec) { |
| mbstate_t mbs; |
| char buf[MB_LEN_MAX]; |
| wchar_t* p; |
| char* convbuf; |
| size_t clen, nbytes; |
| |
| // Allocate space for the maximum number of bytes we could output. |
| if (prec < 0) { |
| memset(&mbs, 0, sizeof(mbs)); |
| p = wcsarg; |
| nbytes = wcsrtombs(nullptr, (const wchar_t**)&p, 0, &mbs); |
| if (nbytes == (size_t)-1) return nullptr; |
| } else { |
| // Optimisation: if the output precision is small enough, |
| // just allocate enough memory for the maximum instead of |
| // scanning the string. |
| if (prec < 128) { |
| nbytes = prec; |
| } else { |
| nbytes = 0; |
| p = wcsarg; |
| memset(&mbs, 0, sizeof(mbs)); |
| for (;;) { |
| clen = wcrtomb(buf, *p++, &mbs); |
| if (clen == 0 || clen == (size_t)-1 || nbytes + clen > (size_t)prec) break; |
| nbytes += clen; |
| } |
| if (clen == (size_t)-1) return nullptr; |
| } |
| } |
| if ((convbuf = static_cast<char*>(malloc(nbytes + 1))) == nullptr) return nullptr; |
| |
| // Fill the output buffer. |
| p = wcsarg; |
| memset(&mbs, 0, sizeof(mbs)); |
| if ((nbytes = wcsrtombs(convbuf, (const wchar_t**)&p, nbytes, &mbs)) == (size_t)-1) { |
| free(convbuf); |
| return nullptr; |
| } |
| convbuf[nbytes] = '\0'; |
| return convbuf; |
| } |
| |
| // Like __fputwc_unlock, but handles fake string (__SSTR) files properly. |
| // File must already be locked. |
| static wint_t xfputwc(wchar_t wc, FILE* fp) { |
| if ((fp->_flags & __SSTR) == 0) return __fputwc_unlock(wc, fp); |
| |
| char buf[MB_LEN_MAX]; |
| mbstate_t mbs = {}; |
| size_t len = wcrtomb(buf, wc, &mbs); |
| if (len == (size_t)-1) { |
| fp->_flags |= __SERR; |
| errno = EILSEQ; |
| return WEOF; |
| } |
| |
| struct __siov iov; |
| iov.iov_base = buf; |
| iov.iov_len = len; |
| struct __suio uio; |
| uio.uio_iov = &iov; |
| uio.uio_resid = len; |
| uio.uio_iovcnt = 1; |
| return (__sfvwrite(fp, &uio) != EOF ? (wint_t)wc : WEOF); |
| } |
| |
| // Convert a multibyte character string argument for the %s format to a wide |
| // string representation. ``prec'' specifies the maximum number of bytes |
| // to output. If ``prec'' is greater than or equal to zero, we can't assume |
| // that the multibyte character string ends in a null character. |
| // |
| // Returns NULL on failure. |
| // To find out what happened check errno for ENOMEM, EILSEQ and EINVAL. |
| static wchar_t* mbsconv(char* mbsarg, int prec) { |
| mbstate_t mbs; |
| const char* p; |
| size_t insize, nchars, nconv; |
| |
| if (mbsarg == nullptr) return nullptr; |
| |
| // Supplied argument is a multibyte string; convert it to wide characters first. |
| if (prec >= 0) { |
| // String is not guaranteed to be NUL-terminated. Find the number of characters to print. |
| p = mbsarg; |
| insize = nchars = nconv = 0; |
| bzero(&mbs, sizeof(mbs)); |
| while (nchars != (size_t)prec) { |
| nconv = mbrlen(p, MB_CUR_MAX, &mbs); |
| if (nconv == (size_t)0 || nconv == (size_t)-1 || nconv == (size_t)-2) break; |
| p += nconv; |
| nchars++; |
| insize += nconv; |
| } |
| if (nconv == (size_t)-1 || nconv == (size_t)-2) return (nullptr); |
| } else { |
| insize = strlen(mbsarg); |
| } |
| |
| // Allocate buffer for the result and perform the conversion, |
| // converting at most `size' bytes of the input multibyte string to |
| // wide characters for printing. |
| wchar_t* convbuf = static_cast<wchar_t*>(calloc(insize + 1, sizeof(*convbuf))); |
| if (convbuf == nullptr) return nullptr; |
| wchar_t* wcp = convbuf; |
| p = mbsarg; |
| bzero(&mbs, sizeof(mbs)); |
| nconv = 0; |
| while (insize != 0) { |
| nconv = mbrtowc(wcp, p, insize, &mbs); |
| if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2) break; |
| wcp++; |
| p += nconv; |
| insize -= nconv; |
| } |
| if (nconv == (size_t)-1 || nconv == (size_t)-2) { |
| free(convbuf); |
| return nullptr; |
| } |
| *wcp = '\0'; |
| |
| return convbuf; |
| } |
| |
| }; |