1  /* Test of snprintf() 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 (snprintf, int, (char *, size_t, char const *, ...));
      25  
      26  #include <string.h>
      27  
      28  #include "macros.h"
      29  
      30  int
      31  main (int argc, char *argv[])
      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 0;
      72  }