1  /* Test of vsnprintf() function.
       2     Copyright (C) 2007-2023 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 0;
      85  }