wcsstr.c revision 76612
1/* $NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun 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 * $FreeBSD: head/lib/libc/string/wcsstr.c 76612 2001-05-15 06:01:19Z tshiozak $ 31 */ 32 33#include <sys/cdefs.h> 34#if defined(LIBC_SCCS) && !defined(lint) 35__RCSID("$NetBSD: wcsstr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $"); 36#endif /* LIBC_SCCS and not lint */ 37 38#include <assert.h> 39#include <wchar.h> 40 41wchar_t * 42wcsstr(big, little) 43 const wchar_t *big; 44 const wchar_t *little; 45{ 46 const wchar_t *p; 47 const wchar_t *q; 48 const wchar_t *r; 49 50 _DIAGASSERT(big != NULL); 51 _DIAGASSERT(little != NULL); 52 53 if (!*little) { 54 /* LINTED interface specification */ 55 return (wchar_t *)big; 56 } 57 if (wcslen(big) < wcslen(little)) 58 return NULL; 59 60 p = big; 61 q = little; 62 while (*p) { 63 q = little; 64 r = p; 65 while (*q) { 66 if (*r != *q) 67 break; 68 q++; 69 r++; 70 } 71 if (!*q) { 72 /* LINTED interface specification */ 73 return (wchar_t *)p; 74 } 75 p++; 76 } 77 return NULL; 78} 79