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       strstr.c - scc - simple c99 compiler
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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 }