1/* $NetBSD: tsearch.c,v 1.3 1999/09/16 11:45:37 lukem Exp $ */
| 1/* $NetBSD: tsearch.c,v 1.3 1999/09/16 11:45:37 lukem Exp $ */
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2/* $FreeBSD: head/lib/libc/stdlib/tsearch.c 92905 2002-03-21 22:49:10Z obrien $ */
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3 4/* 5 * Tree search generalized from Knuth (6.2.2) Algorithm T just like 6 * the AT&T man page says. 7 * 8 * The node_t structure is for internal use only, lint doesn't grok it. 9 * 10 * Written by reading the System V Interface Definition, not the code. 11 * 12 * Totally public domain. 13 */ 14 15#include <sys/cdefs.h>
| 2 3/* 4 * Tree search generalized from Knuth (6.2.2) Algorithm T just like 5 * the AT&T man page says. 6 * 7 * The node_t structure is for internal use only, lint doesn't grok it. 8 * 9 * Written by reading the System V Interface Definition, not the code. 10 * 11 * Totally public domain. 12 */ 13 14#include <sys/cdefs.h>
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| 15#if 0
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16#if defined(LIBC_SCCS) && !defined(lint) 17__RCSID("$NetBSD: tsearch.c,v 1.3 1999/09/16 11:45:37 lukem Exp $"); 18#endif /* LIBC_SCCS and not lint */
| 16#if defined(LIBC_SCCS) && !defined(lint) 17__RCSID("$NetBSD: tsearch.c,v 1.3 1999/09/16 11:45:37 lukem Exp $"); 18#endif /* LIBC_SCCS and not lint */
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| 19#endif 20__FBSDID("$FreeBSD: head/lib/libc/stdlib/tsearch.c 92986 2002-03-22 21:53:29Z obrien $");
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19 20#include <assert.h> 21#define _SEARCH_PRIVATE 22#include <search.h> 23#include <stdlib.h> 24 25/* find or insert datum into search tree */ 26void * 27tsearch(vkey, vrootp, compar) 28 const void *vkey; /* key to be located */ 29 void **vrootp; /* address of tree root */ 30 int (*compar)(const void *, const void *); 31{ 32 node_t *q; 33 node_t **rootp = (node_t **)vrootp; 34 35 if (rootp == NULL) 36 return NULL; 37 38 while (*rootp != NULL) { /* Knuth's T1: */ 39 int r; 40 41 if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */ 42 return *rootp; /* we found it! */ 43 44 rootp = (r < 0) ? 45 &(*rootp)->llink : /* T3: follow left branch */ 46 &(*rootp)->rlink; /* T4: follow right branch */ 47 } 48 49 q = malloc(sizeof(node_t)); /* T5: key not found */ 50 if (q != 0) { /* make new node */ 51 *rootp = q; /* link new node to old */ 52 /* LINTED const castaway ok */ 53 q->key = (void *)vkey; /* initialize new node */ 54 q->llink = q->rlink = NULL; 55 } 56 return q; 57}
| 21 22#include <assert.h> 23#define _SEARCH_PRIVATE 24#include <search.h> 25#include <stdlib.h> 26 27/* find or insert datum into search tree */ 28void * 29tsearch(vkey, vrootp, compar) 30 const void *vkey; /* key to be located */ 31 void **vrootp; /* address of tree root */ 32 int (*compar)(const void *, const void *); 33{ 34 node_t *q; 35 node_t **rootp = (node_t **)vrootp; 36 37 if (rootp == NULL) 38 return NULL; 39 40 while (*rootp != NULL) { /* Knuth's T1: */ 41 int r; 42 43 if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */ 44 return *rootp; /* we found it! */ 45 46 rootp = (r < 0) ? 47 &(*rootp)->llink : /* T3: follow left branch */ 48 &(*rootp)->rlink; /* T4: follow right branch */ 49 } 50 51 q = malloc(sizeof(node_t)); /* T5: key not found */ 52 if (q != 0) { /* make new node */ 53 *rootp = q; /* link new node to old */ 54 /* LINTED const castaway ok */ 55 q->key = (void *)vkey; /* initialize new node */ 56 q->llink = q->rlink = NULL; 57 } 58 return q; 59}
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