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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [search/] [tfind.c] - Rev 308
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/* $NetBSD: tfind.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: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $"); #endif /* LIBC_SCCS and not lint */ #endif #include <assert.h> #define _SEARCH_PRIVATE #include <stdlib.h> #include <search.h> /* find a node, or return 0 */ void * _DEFUN(tfind, (vkey, vrootp, compar), const void *vkey _AND /* key to be found */ void **vrootp _AND /* address of the tree root */ int (*compar)(const void *, const void *)) { node_t **rootp = (node_t **)vrootp; if (rootp == NULL) return NULL; while (*rootp != NULL) { /* T1: */ int r; if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */ return *rootp; /* key found */ rootp = (r < 0) ? &(*rootp)->llink : /* T3: follow left branch */ &(*rootp)->rlink; /* T4: follow right branch */ } return NULL; }
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