1267843Sdelphij/* $NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $ */ 2267843Sdelphij 3267843Sdelphij/*- 4267843Sdelphij * Copyright (c) 1990, 1993 5267843Sdelphij * The Regents of the University of California. All rights reserved. 6267843Sdelphij * 7267843Sdelphij * This code is derived from software contributed to Berkeley by 8267843Sdelphij * Chris Torek. 9267843Sdelphij * 10267843Sdelphij * Redistribution and use in source and binary forms, with or without 11267843Sdelphij * modification, are permitted provided that the following conditions 12267843Sdelphij * are met: 13267843Sdelphij * 1. Redistributions of source code must retain the above copyright 14267843Sdelphij * notice, this list of conditions and the following disclaimer. 15267843Sdelphij * 2. Redistributions in binary form must reproduce the above copyright 16267843Sdelphij * notice, this list of conditions and the following disclaimer in the 17267843Sdelphij * documentation and/or other materials provided with the distribution. 18267843Sdelphij * 3. Neither the name of the University nor the names of its contributors 19267843Sdelphij * may be used to endorse or promote products derived from this software 20267843Sdelphij * without specific prior written permission. 21267843Sdelphij * 22267843Sdelphij * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23267843Sdelphij * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24267843Sdelphij * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25267843Sdelphij * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26267843Sdelphij * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27267843Sdelphij * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28267843Sdelphij * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29267843Sdelphij * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30267843Sdelphij * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31267843Sdelphij * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32267843Sdelphij * SUCH DAMAGE. 33267843Sdelphij */ 34267843Sdelphij 35267843Sdelphij#if defined(LIBC_SCCS) && !defined(lint) 36267843Sdelphij__RCSID("$NetBSD: strcasestr.c,v 1.3 2005/11/29 03:12:00 christos Exp $"); 37267843Sdelphij__RCSID("$NetBSD: strncasecmp.c,v 1.2 2007/06/04 18:19:27 christos Exp $"); 38267843Sdelphij#endif /* LIBC_SCCS and not lint */ 39267843Sdelphij 40267843Sdelphij#include "file.h" 41267843Sdelphij 42267843Sdelphij#include <assert.h> 43267843Sdelphij#include <ctype.h> 44267843Sdelphij#include <string.h> 45267843Sdelphij 46267843Sdelphijstatic int 47267843Sdelphij_strncasecmp(const char *s1, const char *s2, size_t n) 48267843Sdelphij{ 49267843Sdelphij if (n != 0) { 50267843Sdelphij const unsigned char *us1 = (const unsigned char *)s1, 51267843Sdelphij *us2 = (const unsigned char *)s2; 52267843Sdelphij 53267843Sdelphij do { 54267843Sdelphij if (tolower(*us1) != tolower(*us2++)) 55267843Sdelphij return tolower(*us1) - tolower(*--us2); 56267843Sdelphij if (*us1++ == '\0') 57267843Sdelphij break; 58267843Sdelphij } while (--n != 0); 59267843Sdelphij } 60267843Sdelphij return 0; 61267843Sdelphij} 62267843Sdelphij 63267843Sdelphij/* 64267843Sdelphij * Find the first occurrence of find in s, ignore case. 65267843Sdelphij */ 66267843Sdelphijchar * 67267843Sdelphijstrcasestr(const char *s, const char *find) 68267843Sdelphij{ 69267843Sdelphij char c, sc; 70267843Sdelphij size_t len; 71267843Sdelphij 72267843Sdelphij if ((c = *find++) != 0) { 73267843Sdelphij c = tolower((unsigned char)c); 74267843Sdelphij len = strlen(find); 75267843Sdelphij do { 76267843Sdelphij do { 77267843Sdelphij if ((sc = *s++) == 0) 78267843Sdelphij return (NULL); 79267843Sdelphij } while ((char)tolower((unsigned char)sc) != c); 80267843Sdelphij } while (_strncasecmp(s, find, len) != 0); 81267843Sdelphij s--; 82267843Sdelphij } 83267843Sdelphij return (char *)(intptr_t)(s); 84267843Sdelphij} 85