scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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strstr.c (307B)

      1 #include <stddef.h>
      2 #include <string.h>
      3 
      4 #undef strstr
      5 
      6 char *
      7 strstr(const char *s1, const char *s2)
      8 {
      9 	const char *p;
     10 	int c = *s2;
     11 	int len;
     12 
     13 	if ((len = strlen(s2)) == 0)
     14 		return (char *) s1;
     15 
     16 	for (p = s1; p = strchr(p, c); ++p) {
     17 		if (!strncmp(p, s2, len))
     18 			return (char *) p;
     19 	}
     20 
     21 	return NULL;
     22 }