gcc/testsuite/gcc.dg/tree-ssa/pr79800.c

   1 /* PR 79800 - wrong snprintf result range with precision in a narrow
   2    negative-positive range
   3    { dg-do "run" { target c99_runtime } }
   4    { dg-options "-O2 -Wall" } */
   5
   6 #define FMT "%.*a"
   7 char fmt[] = FMT;
   8
   9 volatile double x = 1.23456789;
  10
  11 void f (int p)
  12 {
  13   if (p < -1 || 0 < p)
  14     p = -1;
  15
  16   char d[30];
  17   int n1 = __builtin_sprintf (d, "%.*a", p, x);
  18   const char *s = n1 < 20 ? "< 20" : ">= 20";
  19
  20   if (__builtin_strcmp (s, ">= 20"))
  21     __builtin_abort ();
  22 }
  23
  24 volatile int i = -1;
  25
  26 int main ()
  27 {
  28   f (i);
  29
  30   return 0;
  31 }