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cell-binutils  2.17cvs20070401
strstr.c
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00001 /* Simple implementation of strstr for systems without it.
00002    This function is in the public domain.  */
00003 
00004 /*
00005 
00006 @deftypefn Supplemental char* strstr (const char *@var{string}, const char *@var{sub})
00007 
00008 This function searches for the substring @var{sub} in the string
00009 @var{string}, not including the terminating null characters.  A pointer
00010 to the first occurrence of @var{sub} is returned, or @code{NULL} if the
00011 substring is absent.  If @var{sub} points to a string with zero
00012 length, the function returns @var{string}.
00013 
00014 @end deftypefn
00015 
00016 
00017 */
00018 
00019 
00020 /* FIXME:  The above description is ANSI compiliant.  This routine has not
00021    been validated to comply with it.  -fnf */
00022 
00023 #include <stddef.h>
00024 
00025 extern char *strchr (const char *, int);
00026 extern int strncmp (const void *, const void *, size_t);
00027 extern size_t strlen (const char *);
00028 
00029 char *
00030 strstr (const char *s1, const char *s2)
00031 {
00032   const char *p = s1;
00033   const size_t len = strlen (s2);
00034 
00035   for (; (p = strchr (p, *s2)) != 0; p++)
00036     {
00037       if (strncmp (p, s2, len) == 0)
00038        return (char *)p;
00039     }
00040   return (0);
00041 }