17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
57257d1b4Sraf * Common Development and Distribution License (the "License").
67257d1b4Sraf * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate * and limitations under the License.
127c478bd9Sstevel@tonic-gate *
137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate *
197c478bd9Sstevel@tonic-gate * CDDL HEADER END
207c478bd9Sstevel@tonic-gate */
217257d1b4Sraf
227c478bd9Sstevel@tonic-gate /*
23*23a1cceaSRoger A. Faulkner * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
247c478bd9Sstevel@tonic-gate */
257c478bd9Sstevel@tonic-gate
267c478bd9Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
277c478bd9Sstevel@tonic-gate /* All Rights Reserved */
287c478bd9Sstevel@tonic-gate
297257d1b4Sraf #include "lint.h"
307c478bd9Sstevel@tonic-gate #include <string.h>
317c478bd9Sstevel@tonic-gate #include <stddef.h>
327c478bd9Sstevel@tonic-gate #include <sys/types.h>
337c478bd9Sstevel@tonic-gate
347c478bd9Sstevel@tonic-gate /*
357c478bd9Sstevel@tonic-gate * strstr() locates the first occurrence in the string as1 of
367c478bd9Sstevel@tonic-gate * the sequence of characters (excluding the terminating null
377c478bd9Sstevel@tonic-gate * character) in the string as2. strstr() returns a pointer
387c478bd9Sstevel@tonic-gate * to the located string, or a null pointer if the string is
39*23a1cceaSRoger A. Faulkner * not found. If as2 is empty, the function returns as1.
407c478bd9Sstevel@tonic-gate */
417c478bd9Sstevel@tonic-gate
427c478bd9Sstevel@tonic-gate char *
strstr(const char * as1,const char * as2)437c478bd9Sstevel@tonic-gate strstr(const char *as1, const char *as2)
447c478bd9Sstevel@tonic-gate {
457c478bd9Sstevel@tonic-gate const char *s1, *s2;
467c478bd9Sstevel@tonic-gate const char *tptr;
477c478bd9Sstevel@tonic-gate char c;
487c478bd9Sstevel@tonic-gate
497c478bd9Sstevel@tonic-gate s1 = as1;
507c478bd9Sstevel@tonic-gate s2 = as2;
517c478bd9Sstevel@tonic-gate
527c478bd9Sstevel@tonic-gate if (s2 == NULL || *s2 == '\0')
537c478bd9Sstevel@tonic-gate return ((char *)s1);
547c478bd9Sstevel@tonic-gate
55*23a1cceaSRoger A. Faulkner c = *s2;
56*23a1cceaSRoger A. Faulkner while (*s1 != '\0') {
57*23a1cceaSRoger A. Faulkner if (c == *s1++) {
587c478bd9Sstevel@tonic-gate tptr = s1;
59*23a1cceaSRoger A. Faulkner while ((c = *++s2) == *s1++ && c != '\0')
60*23a1cceaSRoger A. Faulkner continue;
61*23a1cceaSRoger A. Faulkner if (c == '\0')
627c478bd9Sstevel@tonic-gate return ((char *)tptr - 1);
637c478bd9Sstevel@tonic-gate s1 = tptr;
647c478bd9Sstevel@tonic-gate s2 = as2;
657c478bd9Sstevel@tonic-gate c = *s2;
667c478bd9Sstevel@tonic-gate }
67*23a1cceaSRoger A. Faulkner }
68*23a1cceaSRoger A. Faulkner
69*23a1cceaSRoger A. Faulkner return (NULL);
70*23a1cceaSRoger A. Faulkner }
71*23a1cceaSRoger A. Faulkner
72*23a1cceaSRoger A. Faulkner /*
73*23a1cceaSRoger A. Faulkner * strnstr() locates the first occurrence in the string as1 of
74*23a1cceaSRoger A. Faulkner * the sequence of characters (excluding the terminating null
75*23a1cceaSRoger A. Faulkner * character) in the string as2, where not more than n characters
76*23a1cceaSRoger A. Faulkner * from the string as1 are searched. strnstr() returns a pointer
77*23a1cceaSRoger A. Faulkner * to the located string, or a null pointer if the string is
78*23a1cceaSRoger A. Faulkner * not found. If as2 is empty, the function returns as1.
79*23a1cceaSRoger A. Faulkner */
80*23a1cceaSRoger A. Faulkner
81*23a1cceaSRoger A. Faulkner char *
strnstr(const char * as1,const char * as2,size_t n)82*23a1cceaSRoger A. Faulkner strnstr(const char *as1, const char *as2, size_t n)
83*23a1cceaSRoger A. Faulkner {
84*23a1cceaSRoger A. Faulkner const char *s1, *s2;
85*23a1cceaSRoger A. Faulkner const char *tptr;
86*23a1cceaSRoger A. Faulkner size_t k;
87*23a1cceaSRoger A. Faulkner char c;
88*23a1cceaSRoger A. Faulkner
89*23a1cceaSRoger A. Faulkner s1 = as1;
90*23a1cceaSRoger A. Faulkner s2 = as2;
91*23a1cceaSRoger A. Faulkner
92*23a1cceaSRoger A. Faulkner if (s2 == NULL || *s2 == '\0')
93*23a1cceaSRoger A. Faulkner return ((char *)s1);
94*23a1cceaSRoger A. Faulkner
95*23a1cceaSRoger A. Faulkner c = *s2;
96*23a1cceaSRoger A. Faulkner while (*s1 != '\0' && n--) {
97*23a1cceaSRoger A. Faulkner if (c == *s1++) {
98*23a1cceaSRoger A. Faulkner k = n;
99*23a1cceaSRoger A. Faulkner tptr = s1;
100*23a1cceaSRoger A. Faulkner while ((c = *++s2) == *s1++ && c != '\0' && k--)
101*23a1cceaSRoger A. Faulkner continue;
102*23a1cceaSRoger A. Faulkner if (c == '\0')
103*23a1cceaSRoger A. Faulkner return ((char *)tptr - 1);
104*23a1cceaSRoger A. Faulkner s1 = tptr;
105*23a1cceaSRoger A. Faulkner s2 = as2;
106*23a1cceaSRoger A. Faulkner c = *s2;
107*23a1cceaSRoger A. Faulkner }
108*23a1cceaSRoger A. Faulkner }
1097c478bd9Sstevel@tonic-gate
1107c478bd9Sstevel@tonic-gate return (NULL);
1117c478bd9Sstevel@tonic-gate }
112