tests/test-snprintf.c

   1 /* Test of snprintf() function.
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 #include <stdio.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (snprintf, int, (char *, size_t, char const *, ...));
  25
  26 #include <string.h>
  27
  28 #include "macros.h"
  29
  30 int
  31 main ()
  32 {
  33   char buf[8];
  34   int size;
  35   int retval;
  36
  37   retval = snprintf (NULL, 0, "%d", 12345);
  38   ASSERT (retval == 5);
  39
  40   for (size = 0; size <= 8; size++)
  41     {
  42       memcpy (buf, "DEADBEEF", 8);
  43       retval = snprintf (buf, size, "%d", 12345);
  44       ASSERT (retval == 5);
  45       if (size < 6)
  46         {
  47           if (size > 0)
  48             {
  49               ASSERT (memcmp (buf, "12345", size - 1) == 0);
  50               ASSERT (buf[size - 1] == '\0' || buf[size - 1] == '0' + size);
  51             }
  52 #if !CHECK_SNPRINTF_POSIX
  53           if (size > 0)
  54 #endif
  55             ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
  56         }
  57       else
  58         {
  59           ASSERT (memcmp (buf, "12345\0EF", 8) == 0);
  60         }
  61     }
  62
  63   /* Test the support of the POSIX/XSI format strings with positions.  */
  64   {
  65     char result[100];
  66     retval = snprintf (result, sizeof (result), "%2$d %1$d", 33, 55);
  67     ASSERT (strcmp (result, "55 33") == 0);
  68     ASSERT (retval == strlen (result));
  69   }
  70
  71   return test_exit_status;
  72 }