stdio-common/bug22.c

   1 /* BZ #5424 */
   2 #include <stdio.h>
   3 #include <errno.h>
   4 #include <libc-diag.h>
   5
   6 /* INT_MAX + 1 */
   7 #define N 2147483648
   8
   9 /* (INT_MAX / 2) + 2 */
  10 #define N2 1073741825
  11
  12 /* INT_MAX - 3 */
  13 #define N3 2147483644
  14
  15 #define STRINGIFY(S) #S
  16 #define MAKE_STR(S) STRINGIFY(S)
  17
  18 #define SN MAKE_STR(N)
  19 #define SN2 MAKE_STR(N2)
  20 #define SN3 MAKE_STR(N3)
  21
  22 static int
  23 do_test (void)
  24 {
  25   int ret;
  26
  27   FILE *fp = fopen ("/dev/null", "w");
  28   if (fp == NULL)
  29     {
  30       puts ("cannot open /dev/null");
  31       return 1;
  32     }
  33
  34   /* GCC 9 warns about output of more than INT_MAX characters; this is
  35      deliberately tested here.  */
  36   DIAG_PUSH_NEEDS_COMMENT;
  37 #if __GNUC_PREREQ (7, 0)
  38   DIAG_IGNORE_NEEDS_COMMENT (9, "-Wformat-overflow=");
  39 #endif
  40   ret = fprintf (fp, "%" SN "d", 1);
  41   DIAG_POP_NEEDS_COMMENT;
  42   printf ("ret = %d\n", ret);
  43   if (ret != -1 || errno != EOVERFLOW)
  44           return 1;
  45
  46   /* GCC 9 warns about output of more than INT_MAX characters; this is
  47      deliberately tested here.  */
  48   DIAG_PUSH_NEEDS_COMMENT;
  49 #if __GNUC_PREREQ (7, 0)
  50   DIAG_IGNORE_NEEDS_COMMENT (9, "-Wformat-overflow=");
  51 #endif
  52   ret = fprintf (fp, "%." SN "d", 1);
  53   DIAG_POP_NEEDS_COMMENT;
  54   printf ("ret = %d\n", ret);
  55   if (ret != -1 || errno != EOVERFLOW)
  56           return 1;
  57
  58   ret = fprintf (fp, "%." SN3 "d", 1);
  59   printf ("ret = %d\n", ret);
  60   if (ret != -1 || errno != EOVERFLOW)
  61           return 1;
  62
  63   /* GCC 9 warns about output of more than INT_MAX characters; this is
  64      deliberately tested here.  */
  65   DIAG_PUSH_NEEDS_COMMENT;
  66 #if __GNUC_PREREQ (7, 0)
  67   DIAG_IGNORE_NEEDS_COMMENT (9, "-Wformat-overflow=");
  68 #endif
  69   ret = fprintf (fp, "%" SN2 "d%" SN2 "d", 1, 1);
  70   DIAG_POP_NEEDS_COMMENT;
  71   printf ("ret = %d\n", ret);
  72
  73   return ret != -1 || errno != EOVERFLOW;
  74 }
  75
  76 #define TIMEOUT 60
  77 #define TEST_FUNCTION do_test ()
  78 #include "../test-skeleton.c"