projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5b2abdfb | 1 | /*- |
| 9385eb3d | 2 | * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org> |
| e9ce8d39 A |
3 | * Copyright (c) 1990, 1993 |
| 4 | * The Regents of the University of California. All rights reserved. | |
| 5 | * | |
| 6 | * This code is derived from software contributed to Berkeley by | |
| 7 | * Chris Torek. | |
| 8 | * | |
| 9 | * Redistribution and use in source and binary forms, with or without | |
| 10 | * modification, are permitted provided that the following conditions | |
| 11 | * are met: | |
| 12 | * 1. Redistributions of source code must retain the above copyright | |
| 13 | * notice, this list of conditions and the following disclaimer. | |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 15 | * notice, this list of conditions and the following disclaimer in the | |
| 16 | * documentation and/or other materials provided with the distribution. | |
| 17 | * 3. All advertising materials mentioning features or use of this software | |
| 18 | * must display the following acknowledgement: | |
| 19 | * This product includes software developed by the University of | |
| 20 | * California, Berkeley and its contributors. | |
| 21 | * 4. Neither the name of the University nor the names of its contributors | |
| 22 | * may be used to endorse or promote products derived from this software | |
| 23 | * without specific prior written permission. | |
| 24 | * | |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 35 | * SUCH DAMAGE. | |
| 36 | */ | |
| 37 | ||
| 38 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 9385eb3d | 39 | static char sccsid[] = "@(#)strstr.c 8.1 (Berkeley) 6/4/93"; |
| e9ce8d39 | 40 | #endif /* LIBC_SCCS and not lint */ |
| 9385eb3d | 41 | #include <sys/cdefs.h> |
| 224c7076 | 42 | __FBSDID("$FreeBSD: src/lib/libc/string/strnstr.c,v 1.3 2005/02/11 21:07:51 pjd Exp $"); |
| e9ce8d39 | 43 | |
| 9385eb3d | 44 | #include <string.h> |
| e9ce8d39 | 45 | |
| 9385eb3d A |
46 | /* |
| 47 | * Find the first occurrence of find in s, where the search is limited to the | |
| 48 | * first slen characters of s. | |
| 49 | */ | |
| 50 | char * | |
| 51 | strnstr(s, find, slen) | |
| 52 | const char *s; | |
| 53 | const char *find; | |
| 54 | size_t slen; | |
| e9ce8d39 | 55 | { |
| 9385eb3d A |
56 | char c, sc; |
| 57 | size_t len; | |
| 5b2abdfb | 58 | |
| 9385eb3d A |
59 | if ((c = *find++) != '\0') { |
| 60 | len = strlen(find); | |
| 61 | do { | |
| 62 | do { | |
| 224c7076 | 63 | if (slen-- < 1 || (sc = *s++) == '\0') |
| 9385eb3d A |
64 | return (NULL); |
| 65 | } while (sc != c); | |
| 66 | if (len > slen) | |
| 67 | return (NULL); | |
| 68 | } while (strncmp(s, find, len) != 0); | |
| 69 | s--; | |
| 70 | } | |
| 71 | return ((char *)s); | |
| e9ce8d39 | 72 | } |