gcc/testsuite/gcc.c-torture/execute/builtins/lib/strstr.c

   1 extern int inside_main;
   2
   3 char *
   4 strstr(const char *s1, const char *s2)
   5 {
   6   const char *p, *q;
   7
   8 #ifdef __OPTIMIZE__
   9   if (inside_main)
  10     abort ();
  11 #endif
  12
  13   /* deliberately dumb algorithm */
  14   for (; *s1; s1++)
  15     {
  16       p = s1, q = s2;
  17       while (*q && *p)
  18         {
  19           if (*q != *p)
  20             break;
  21           p++, q++;
  22         }
  23       if (*q == 0)
  24         return (char *)s1;
  25     }
  26   return 0;
  27 }