1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #include "synonyms.h" 34 #include <string.h> 35 #include <stddef.h> 36 #include <sys/types.h> 37 38 /* 39 * strstr() locates the first occurrence in the string as1 of 40 * the sequence of characters (excluding the terminating null 41 * character) in the string as2. strstr() returns a pointer 42 * to the located string, or a null pointer if the string is 43 * not found. If as2 is "", the function returns as1. 44 */ 45 46 char * 47 strstr(const char *as1, const char *as2) 48 { 49 const char *s1, *s2; 50 const char *tptr; 51 char c; 52 53 s1 = as1; 54 s2 = as2; 55 56 if (s2 == NULL || *s2 == '\0') 57 return ((char *)s1); 58 c = *s2; 59 60 while (*s1) 61 if (*s1++ == c) { 62 tptr = s1; 63 while ((c = *++s2) == *s1++ && c) 64 ; 65 if (c == 0) 66 return ((char *)tptr - 1); 67 s1 = tptr; 68 s2 = as2; 69 c = *s2; 70 } 71 72 return (NULL); 73 } 74