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

   1 extern void abort (void);
   2 extern int inside_main;
   3
   4 typedef __SIZE_TYPE__ size_t;
   5
   6 __attribute__ ((__noinline__))
   7 int
   8 strncmp(const char *s1, const char *s2, size_t n)
   9 {
  10   const unsigned char *u1 = (const unsigned char *)s1;
  11   const unsigned char *u2 = (const unsigned char *)s2;
  12   unsigned char c1, c2;
  13
  14 #ifdef __OPTIMIZE__
  15   if (inside_main)
  16     abort();
  17 #endif
  18
  19   while (n > 0)
  20     {
  21       c1 = *u1++, c2 = *u2++;
  22       if (c1 == '\0' || c1 != c2)
  23         return c1 - c2;
  24       n--;
  25     }
  26   return c1 - c2;
  27 }