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1 : : /* SPDX-License-Identifier: BSD-4-Clause-UC */ 2 : : 3 : : /*- 4 : : * Copyright (c) 1990, 1993 5 : : * The Regents of the University of California. All rights reserved. 6 : : * 7 : : * This code is derived from software contributed to Berkeley by 8 : : * Chris Torek. 9 : : * 10 : : * Redistribution and use in source and binary forms, with or without 11 : : * modification, are permitted provided that the following conditions 12 : : * are met: 13 : : * 1. Redistributions of source code must retain the above copyright 14 : : * notice, this list of conditions and the following disclaimer. 15 : : * 2. Redistributions in binary form must reproduce the above copyright 16 : : * notice, this list of conditions and the following disclaimer in the 17 : : * documentation and/or other materials provided with the distribution. 18 : : * 3. All advertising materials mentioning features or use of this software 19 : : * must display the following acknowledgment: 20 : : * This product includes software developed by the University of 21 : : * California, Berkeley and its contributors. 22 : : * 4. Neither the name of the University nor the names of its contributors 23 : : * may be used to endorse or promote products derived from this software 24 : : * without specific prior written permission. 25 : : * 26 : : * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 : : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 : : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 : : * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 : : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 : : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 : : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 : : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 : : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 : : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 : : * SUCH DAMAGE. 37 : : */ 38 : : 39 : : #include <string.h> 40 : : 41 : : /* 42 : : * Find the first occurrence of find in s. 43 : : */ 44 : : char * 45 : : strstr(const char *s, const char *find) 46 : : { 47 : : char c, sc; 48 : : size_t len; 49 : : 50 : 0 : c = *find++; 51 [ # # ]: 0 : if (c != 0) { 52 : 0 : len = strlen(find); 53 : : do { 54 : : do { 55 : 0 : sc = *s++; 56 [ # # ]: 0 : if (sc == 0) { 57 : 0 : return NULL; 58 : : } 59 [ # # ]: 0 : } while (sc != c); 60 [ # # ]: 0 : } while (strncmp(s, find, len) != 0); 61 : 0 : s--; 62 : : } 63 : 0 : return (char *)s; 64 : : }