The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/libsa/strstr.c

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    1 /*
    2  * Copyright (c) 2001 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
    5  * 
    6  * This file contains Original Code and/or Modifications of Original Code
    7  * as defined in and that are subject to the Apple Public Source License
    8  * Version 2.0 (the 'License'). You may not use this file except in
    9  * compliance with the License. The rights granted to you under the License
   10  * may not be used to create, or enable the creation or redistribution of,
   11  * unlawful or unlicensed copies of an Apple operating system, or to
   12  * circumvent, violate, or enable the circumvention or violation of, any
   13  * terms of an Apple operating system software license agreement.
   14  * 
   15  * Please obtain a copy of the License at
   16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
   17  * 
   18  * The Original Code and all software distributed under the License are
   19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   23  * Please see the License for the specific language governing rights and
   24  * limitations under the License.
   25  * 
   26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
   27  */
   28 /*
   29  * Copyright (c) 1988, 1993
   30  *      The Regents of the University of California.  All rights reserved.
   31  *
   32  * Redistribution and use in source and binary forms, with or without
   33  * modification, are permitted provided that the following conditions
   34  * are met:
   35  * 1. Redistributions of source code must retain the above copyright
   36  *    notice, this list of conditions and the following disclaimer.
   37  * 2. Redistributions in binary form must reproduce the above copyright
   38  *    notice, this list of conditions and the following disclaimer in the
   39  *    documentation and/or other materials provided with the distribution.
   40  * 3. All advertising materials mentioning features or use of this software
   41  *    must display the following acknowledgement:
   42  *      This product includes software developed by the University of
   43  *      California, Berkeley and its contributors.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  */
   60 /*
   61  * History:
   62  *  2002-01-24  gvdl    Initial implementation of strstr
   63  */
   64 
   65 #include <string.h>
   66 #include <libsa/stdlib.h>
   67 
   68 __private_extern__ char *
   69 strstr(const char *in, const char *str)
   70 {
   71     char c;
   72     size_t len;
   73 
   74     c = *str++;
   75     if (!c)
   76         return (char *) in;     // Trivial empty string case
   77 
   78     len = strlen(str);
   79     do {
   80         char sc;
   81 
   82         do {
   83             sc = *in++;
   84             if (!sc)
   85                 return (char *) 0;
   86         } while (sc != c);
   87     } while (strncmp(in, str, len) != 0);
   88 
   89     return (char *) (in - 1);
   90 }

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