gcc/testsuite/gcc.dg/tree-ssa/builtin-snprintf-8.c

   1 /* Test to verify that snprintf can determine the correct range
   2    of lengths of string arguments based on the results of prior
   3    calls to strlen.
   4    { dg-do compile }
   5    { dg-options "-O2 -Wall -fdump-tree-optimized" } */
   6
   7 typedef __SIZE_TYPE__ size_t;
   8
   9 void abort (void);
  10 size_t strlen (const char *);
  11 int snprintf (char * restrict, size_t, const char *restrict, ...);
  12
  13 void one_str_exact (const char *str)
  14 {
  15   if (1 == strlen (str))
  16     if (1 != snprintf (0, 0, "%s", str))
  17       abort ();
  18 }
  19
  20 void two_str_exact (const char *s1, const char *s2)
  21 {
  22   if (1 == strlen (s1) && 2 == strlen (s2))
  23     if (3 != snprintf (0, 0, "%s%s", s1, s2))
  24       abort ();
  25 }
  26
  27 void one_str_maxlen (const char *str)
  28 {
  29   if (2 >= strlen (str))
  30     if (2 < snprintf (0, 0, "%s", str))
  31       abort ();
  32 }
  33
  34 void two_str_maxlen (const char *s1, const char *s2)
  35 {
  36   if (2 >= strlen (s1) && 3 >= strlen (s2))
  37     if (5 < snprintf (0, 0, "%s%s", s1, s2))
  38       abort ();
  39 }
  40
  41 /* { dg-final { scan-tree-dump-not "abort" "optimized" } } */