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

   1 extern void abort (void);
   2 extern int inside_main;
   3
   4 __attribute__ ((__noinline__))
   5 char *
   6 strstr(const char *s1, const char *s2)
   7 {
   8   const char *p, *q;
   9
  10 #ifdef __OPTIMIZE__
  11   if (inside_main)
  12     abort ();
  13 #endif
  14
  15   /* deliberately dumb algorithm */
  16   for (; *s1; s1++)
  17     {
  18       p = s1, q = s2;
  19       while (*q && *p)
  20         {
  21           if (*q != *p)
  22             break;
  23           p++, q++;
  24         }
  25       if (*q == 0)
  26         return (char *)s1;
  27     }
  28   return 0;
  29 }