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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [search/] [tsearch.c] - Rev 855
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/* $NetBSD: tsearch.c,v 1.3 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: tsearch.c,v 1.3 1999/09/16 11:45:37 lukem Exp $"); #endif /* LIBC_SCCS and not lint */ #endif #include <assert.h> #define _SEARCH_PRIVATE #include <search.h> #include <stdlib.h> /* find or insert datum into search tree */ void * _DEFUN(tsearch, (vkey, vrootp, compar), const void *vkey _AND /* key to be located */ void **vrootp _AND /* address of tree root */ int (*compar)(const void *, const void *)) { node_t *q; node_t **rootp = (node_t **)vrootp; if (rootp == NULL) return NULL; while (*rootp != NULL) { /* Knuth's T1: */ int r; if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */ return *rootp; /* we found it! */ rootp = (r < 0) ? &(*rootp)->llink : /* T3: follow left branch */ &(*rootp)->rlink; /* T4: follow right branch */ } q = malloc(sizeof(node_t)); /* T5: key not found */ if (q != 0) { /* make new node */ *rootp = q; /* link new node to old */ /* LINTED const castaway ok */ q->key = (void *)vkey; /* initialize new node */ q->llink = q->rlink = NULL; } return q; }
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