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 != N3)
      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"