1 /* $NetBSD: wcsstr.c,v 1.2 2001/01/03 14:29:37 lukem Exp $ */ 2 3 /*- 4 * Copyright (c)1999 Citrus Project, 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * citrus Id: wcsstr.c,v 1.2 2000/12/21 05:07:25 itojun Exp 29 */ 30 31 #include <sys/cdefs.h> 32 #if defined(LIBC_SCCS) && !defined(lint) 33 __RCSID("$NetBSD: wcsstr.c,v 1.2 2001/01/03 14:29:37 lukem Exp $"); 34 #endif /* LIBC_SCCS and not lint */ 35 36 #include <assert.h> 37 #include <wchar.h> 38 39 wchar_t * 40 wcsstr(big, little) 41 const wchar_t *big; 42 const wchar_t *little; 43 { 44 const wchar_t *p; 45 const wchar_t *q; 46 const wchar_t *r; 47 48 _DIAGASSERT(big != NULL); 49 _DIAGASSERT(little != NULL); 50 51 if (!*little) { 52 /* LINTED interface specification */ 53 return (wchar_t *)big; 54 } 55 if (wcslen(big) < wcslen(little)) 56 return NULL; 57 58 p = big; 59 q = little; 60 while (*p) { 61 q = little; 62 r = p; 63 while (*q) { 64 if (*r != *q) 65 break; 66 q++; 67 r++; 68 } 69 if (!*q) { 70 /* LINTED interface specification */ 71 return (wchar_t *)p; 72 } 73 p++; 74 } 75 return NULL; 76 } 77