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       1                 :            : /*-
       2                 :            :  * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
       3                 :            :  * Copyright (c) 1990, 1993
       4                 :            :  *      The Regents of the University of California.  All rights reserved.
       5                 :            :  *
       6                 :            :  * This code is derived from software contributed to Berkeley by
       7                 :            :  * Chris Torek.
       8                 :            :  *
       9                 :            :  * Redistribution and use in source and binary forms, with or without
      10                 :            :  * modification, are permitted provided that the following conditions
      11                 :            :  * are met:
      12                 :            :  * 1. Redistributions of source code must retain the above copyright
      13                 :            :  *    notice, this list of conditions and the following disclaimer.
      14                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      15                 :            :  *    notice, this list of conditions and the following disclaimer in the
      16                 :            :  *    documentation and/or other materials provided with the distribution.
      17                 :            :  * 3. Neither the name of the University nor the names of its contributors
      18                 :            :  *    may be used to endorse or promote products derived from this software
      19                 :            :  *    without specific prior written permission.
      20                 :            :  *
      21                 :            :  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
      22                 :            :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      23                 :            :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      24                 :            :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
      25                 :            :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      26                 :            :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      27                 :            :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28                 :            :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      29                 :            :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      30                 :            :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      31                 :            :  * SUCH DAMAGE.
      32                 :            :  */
      33                 :            : 
      34                 :            : #include <sys/cdefs.h>
      35                 :            : #include <string.h>
      36                 :            : 
      37                 :            : #if !HAVE_STRNSTR
      38                 :            : /*
      39                 :            :  * Find the first occurrence of find in s, where the search is limited to the
      40                 :            :  * first slen characters of s.
      41                 :            :  */
      42                 :            : char *
      43                 :          0 : strnstr(const char *s, const char *find, size_t slen)
      44                 :            : {
      45                 :            :         char c, sc;
      46                 :            :         size_t len;
      47                 :            : 
      48         [ #  # ]:          0 :         if ((c = *find++) != '\0') {
      49                 :          0 :                 len = strlen(find);
      50                 :          0 :                 do {
      51                 :          0 :                         do {
      52   [ #  #  #  # ]:          0 :                                 if (slen-- < 1 || (sc = *s++) == '\0')
      53                 :          0 :                                         return (NULL);
      54         [ #  # ]:          0 :                         } while (sc != c);
      55         [ #  # ]:          0 :                         if (len > slen)
      56                 :          0 :                                 return (NULL);
      57         [ #  # ]:          0 :                 } while (strncmp(s, find, len) != 0);
      58                 :          0 :                 s--;
      59                 :          0 :         }
      60                 :          0 :         return ((char *)s);
      61                 :          0 : }
      62                 :            : #endif