Last change
on this file since 561 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.1 KB
|
Rev | Line | |
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[444] | 1 | /* $NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $ */ |
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| 2 | |
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| 3 | /* |
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| 4 | * Tree search generalized from Knuth (6.2.2) Algorithm T just like |
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| 5 | * the AT&T man page says. |
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| 6 | * |
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| 7 | * The node_t structure is for internal use only, lint doesn't grok it. |
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| 8 | * |
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| 9 | * Written by reading the System V Interface Definition, not the code. |
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| 10 | * |
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| 11 | * Totally public domain. |
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| 12 | */ |
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| 13 | |
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| 14 | #include <sys/cdefs.h> |
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| 15 | #if 0 |
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| 16 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 17 | __RCSID("$NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $"); |
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| 18 | #endif /* LIBC_SCCS and not lint */ |
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| 19 | #endif |
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| 20 | |
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| 21 | #include <assert.h> |
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| 22 | #define _SEARCH_PRIVATE |
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| 23 | #include <stdlib.h> |
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| 24 | #include <search.h> |
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| 25 | |
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| 26 | /* find a node, or return 0 */ |
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| 27 | void * |
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| 28 | tfind (const void *vkey, /* key to be found */ |
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| 29 | void **vrootp, /* address of the tree root */ |
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| 30 | int (*compar)(const void *, const void *)) |
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| 31 | { |
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| 32 | node_t **rootp = (node_t **)vrootp; |
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| 33 | |
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| 34 | if (rootp == NULL) |
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| 35 | return NULL; |
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| 36 | |
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| 37 | while (*rootp != NULL) { /* T1: */ |
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| 38 | int r; |
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| 39 | |
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| 40 | if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */ |
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| 41 | return *rootp; /* key found */ |
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| 42 | rootp = (r < 0) ? |
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| 43 | &(*rootp)->llink : /* T3: follow left branch */ |
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| 44 | &(*rootp)->rlink; /* T4: follow right branch */ |
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| 45 | } |
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| 46 | return NULL; |
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| 47 | } |
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