projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 15637ed4 RG |
1 | /* |
| 2 | * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * Adam de Boor. | |
| 7 | * | |
| 8 | * Redistribution and use in source and binary forms, with or without | |
| 9 | * modification, are permitted provided that the following conditions | |
| 10 | * are met: | |
| 11 | * 1. Redistributions of source code must retain the above copyright | |
| 12 | * notice, this list of conditions and the following disclaimer. | |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 14 | * notice, this list of conditions and the following disclaimer in the | |
| 15 | * documentation and/or other materials provided with the distribution. | |
| 16 | * 3. All advertising materials mentioning features or use of this software | |
| 17 | * must display the following acknowledgement: | |
| 18 | * This product includes software developed by the University of | |
| 19 | * California, Berkeley and its contributors. | |
| 20 | * 4. Neither the name of the University nor the names of its contributors | |
| 21 | * may be used to endorse or promote products derived from this software | |
| 22 | * without specific prior written permission. | |
| 23 | * | |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 34 | * SUCH DAMAGE. | |
| 35 | */ | |
| 36 | ||
| 37 | #ifndef lint | |
| 38 | static char sccsid[] = "@(#)lstFindFrom.c 5.3 (Berkeley) 6/1/90"; | |
| 39 | #endif /* not lint */ | |
| 40 | ||
| 41 | /*- | |
| 42 | * LstFindFrom.c -- | |
| 43 | * Find a node on a list from a given starting point. Used by Lst_Find. | |
| 44 | */ | |
| 45 | ||
| 46 | #include "lstInt.h" | |
| 47 | ||
| 48 | /*- | |
| 49 | *----------------------------------------------------------------------- | |
| 50 | * Lst_FindFrom -- | |
| 51 | * Search for a node starting and ending with the given one on the | |
| 52 | * given list using the passed datum and comparison function to | |
| 53 | * determine when it has been found. | |
| 54 | * | |
| 55 | * Results: | |
| 56 | * The found node or NILLNODE | |
| 57 | * | |
| 58 | * Side Effects: | |
| 59 | * None. | |
| 60 | * | |
| 61 | *----------------------------------------------------------------------- | |
| 62 | */ | |
| 63 | LstNode | |
| 64 | Lst_FindFrom (l, ln, d, cProc) | |
| 65 | Lst l; | |
| 66 | register LstNode ln; | |
| 67 | register ClientData d; | |
| 68 | register int (*cProc)(); | |
| 69 | { | |
| 70 | register ListNode tln; | |
| 71 | Boolean found = FALSE; | |
| 72 | ||
| 73 | if (!LstValid (l) || LstIsEmpty (l) || !LstNodeValid (ln, l)) { | |
| 74 | return (NILLNODE); | |
| 75 | } | |
| 76 | ||
| 77 | tln = (ListNode)ln; | |
| 78 | ||
| 79 | do { | |
| 80 | if ((*cProc) (tln->datum, d) == 0) { | |
| 81 | found = TRUE; | |
| 82 | break; | |
| 83 | } else { | |
| 84 | tln = tln->nextPtr; | |
| 85 | } | |
| 86 | } while (tln != (ListNode)ln && tln != NilListNode); | |
| 87 | ||
| 88 | if (found) { | |
| 89 | return ((LstNode)tln); | |
| 90 | } else { | |
| 91 | return (NILLNODE); | |
| 92 | } | |
| 93 | } | |
| 94 |