gcc/testsuite/gcc.c-torture/execute/pr78622.c

   1 /* PR middle-end/78622 - [7 Regression] -Wformat-overflow/-fprintf-return-value
   2    incorrect with overflow/wrapping
   3    { dg-skip-if "Requires %hhd format" { hppa*-*-hpux* } { "*" } { "" } }
   4    { dg-require-effective-target c99_runtime }
   5    { dg-additional-options "-Wformat-overflow=2" } */
   6
   7 __attribute__((noinline, noclone)) int
   8 foo (int x)
   9 {
  10   if (x < 4096 + 8 || x >= 4096 + 256 + 8)
  11     return -1;
  12
  13   char buf[5];
  14   int n = __builtin_snprintf (buf, sizeof buf, "%hhd", x + 1);
  15   __builtin_printf ("\"%hhd\" => %i\n", x + 1, n);
  16   return n;
  17 }
  18
  19 int
  20 main (void)
  21 {
  22   if (__SCHAR_MAX__ != 127 || __CHAR_BIT__ != 8 || __SIZEOF_INT__ != 4)
  23     return 0;
  24
  25   if (foo (4095 + 9) != 1
  26       || foo (4095 + 32) != 2
  27       || foo (4095 + 127) != 3
  28       || foo (4095 + 128) != 4
  29       || foo (4095 + 240) != 3
  30       || foo (4095 + 248) != 2
  31       || foo (4095 + 255) != 2
  32       || foo (4095 + 256) != 1)
  33     __builtin_abort ();
  34
  35   return 0;
  36 }