New additions/bug fixes required/found when porting perf.
New functions:
tfind
tsearch
tdelete
twalk
tdestroy (GNU extension)
Bug fix: the current implementation for realpath would crash
if the second argument (resolved_path) is NULL.
New headers:
ar.h
search.h
Change-Id: Ib6c1e42fc186a6d597a6e5a9692b16acaa155804
diff --git a/libc/bionic/tdelete.c b/libc/bionic/tdelete.c
new file mode 100644
index 0000000..b64b47a
--- /dev/null
+++ b/libc/bionic/tdelete.c
@@ -0,0 +1,71 @@
+/* $NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $ */
+
+/*
+ * Tree search generalized from Knuth (6.2.2) Algorithm T just like
+ * the AT&T man page says.
+ *
+ * The node_t structure is for internal use only, lint doesn't grok it.
+ *
+ * Written by reading the System V Interface Definition, not the code.
+ *
+ * Totally public domain.
+ */
+
+#include <sys/cdefs.h>
+#if 0
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
+#endif /* LIBC_SCCS and not lint */
+#endif
+__FBSDID("$FreeBSD: release/9.0.0/lib/libc/stdlib/tdelete.c 108694 2003-01-05 02:43:18Z tjr $");
+
+#define _SEARCH_PRIVATE
+#include <search.h>
+#include <stdlib.h>
+
+
+/*
+ * delete node with given key
+ *
+ * vkey: key to be deleted
+ * vrootp: address of the root of the tree
+ * compar: function to carry out node comparisons
+ */
+void *
+tdelete(const void * __restrict vkey, void ** __restrict vrootp,
+ int (*compar)(const void *, const void *))
+{
+ node_t **rootp = (node_t **)vrootp;
+ node_t *p, *q, *r;
+ int cmp;
+
+ if (rootp == NULL || (p = *rootp) == NULL)
+ return NULL;
+
+ while ((cmp = (*compar)(vkey, (*rootp)->key)) != 0) {
+ p = *rootp;
+ rootp = (cmp < 0) ?
+ &(*rootp)->llink : /* follow llink branch */
+ &(*rootp)->rlink; /* follow rlink branch */
+ if (*rootp == NULL)
+ return NULL; /* key not found */
+ }
+ r = (*rootp)->rlink; /* D1: */
+ if ((q = (*rootp)->llink) == NULL) /* Left NULL? */
+ q = r;
+ else if (r != NULL) { /* Right link is NULL? */
+ if (r->llink == NULL) { /* D2: Find successor */
+ r->llink = q;
+ q = r;
+ } else { /* D3: Find NULL link */
+ for (q = r->llink; q->llink != NULL; q = r->llink)
+ r = q;
+ r->llink = q->rlink;
+ q->llink = (*rootp)->llink;
+ q->rlink = (*rootp)->rlink;
+ }
+ }
+ free(*rootp); /* D4: Free node */
+ *rootp = q; /* link parent to new node */
+ return p;
+}