tests/test-vsnprintf.c

   1 /* Test of vsnprintf() 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 (vsnprintf, int, (char *, size_t, char const *, va_list));
  25
  26 #include <stdarg.h>
  27 #include <string.h>
  28
  29 #include "macros.h"
  30
  31 static int
  32 my_snprintf (char *buf, int size, const char *format, ...)
  33 {
  34   va_list args;
  35   int ret;
  36
  37   va_start (args, format);
  38   ret = vsnprintf (buf, size, format, args);
  39   va_end (args);
  40   return ret;
  41 }
  42
  43 int
  44 main (int argc, char *argv[])
  45 {
  46   char buf[8];
  47   int size;
  48   int retval;
  49
  50   retval = my_snprintf (NULL, 0, "%d", 12345);
  51   ASSERT (retval == 5);
  52
  53   for (size = 0; size <= 8; size++)
  54     {
  55       memcpy (buf, "DEADBEEF", 8);
  56       retval = my_snprintf (buf, size, "%d", 12345);
  57       ASSERT (retval == 5);
  58       if (size < 6)
  59         {
  60           if (size > 0)
  61             {
  62               ASSERT (memcmp (buf, "12345", size - 1) == 0);
  63               ASSERT (buf[size - 1] == '\0' || buf[size - 1] == '0' + size);
  64             }
  65 #if !CHECK_VSNPRINTF_POSIX
  66           if (size > 0)
  67 #endif
  68             ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
  69         }
  70       else
  71         {
  72           ASSERT (memcmp (buf, "12345\0EF", 8) == 0);
  73         }
  74     }
  75
  76   /* Test the support of the POSIX/XSI format strings with positions.  */
  77   {
  78     char result[100];
  79     retval = my_snprintf (result, sizeof (result), "%2$d %1$d", 33, 55);
  80     ASSERT (strcmp (result, "55 33") == 0);
  81     ASSERT (retval == strlen (result));
  82   }
  83
  84   return test_exit_status;
  85 }