1 /* $NetBSD: strstr.c,v 1.1.1.2 2009/03/20 20:26:56 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from the Free Software Foundation, Inc. GNU utilities. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgment: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * 41 * File: am-utils/libamu/strstr.c 42 * 43 */ 44 45 #ifdef HAVE_CONFIG_H 46 # include <config.h> 47 #endif /* HAVE_CONFIG_H */ 48 #include <am_defs.h> 49 #include <amu.h> 50 51 52 /* strstr.c -- return the offset of one string within another 53 Copyright (C) 1989, 1990 Free Software Foundation, Inc. 54 55 This program is free software; you can redistribute it and/or modify 56 it under the terms of the GNU General Public License as published by 57 the Free Software Foundation; either version 2, or (at your option) 58 any later version. 59 60 This program is distributed in the hope that it will be useful, 61 but WITHOUT ANY WARRANTY; without even the implied warranty of 62 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 63 GNU General Public License for more details. 64 65 You should have received a copy of the GNU General Public License 66 along with this program; if not, write to the Free Software 67 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ 68 69 /* Author: 70 Mike Rendell Department of Computer Science 71 michael@garfield.mun.edu Memorial University of Newfoundland 72 ..!uunet!garfield!michael St. John's, Nfld., Canada 73 (709) 737-4550 A1C 5S7 74 */ 75 76 77 /* 78 * Return the starting address of string S2 in S1; 79 * return 0 if it is not found. 80 */ 81 char * 82 strstr(char *s1, char *s2) 83 { 84 int i; 85 char *p1; 86 char *p2; 87 char *s = s1; 88 89 for (p2 = s2, i = 0; *s; p2 = s2, i++, s++) { 90 for (p1 = s; *p1 && *p2 && *p1 == *p2; p1++, p2++) 91 ; 92 if (!*p2) 93 break; 94 } 95 if (!*p2) 96 return s1 + i; 97 98 return 0; 99 } 100