Blame gnulib-tests/test-snprintf.c

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/* Test of snprintf() function.
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   Copyright (C) 2007-2017 Free Software Foundation, Inc.
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   This program is free software: you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
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#include <config.h>
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#include <stdio.h>
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#include "signature.h"
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SIGNATURE_CHECK (snprintf, int, (char *, size_t, char const *, ...));
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#include <string.h>
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#include "macros.h"
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int
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main (int argc, char *argv[])
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{
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  char buf[8];
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  int size;
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  int retval;
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  retval = snprintf (NULL, 0, "%d", 12345);
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  ASSERT (retval == 5);
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  for (size = 0; size <= 8; size++)
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    {
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      memcpy (buf, "DEADBEEF", 8);
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      retval = snprintf (buf, size, "%d", 12345);
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      ASSERT (retval == 5);
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      if (size < 6)
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        {
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          if (size > 0)
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            {
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              ASSERT (memcmp (buf, "12345", size - 1) == 0);
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              ASSERT (buf[size - 1] == '\0' || buf[size - 1] == '0' + size);
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            }
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#if !CHECK_SNPRINTF_POSIX
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          if (size > 0)
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#endif
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            ASSERT (memcmp (buf + size, &"DEADBEEF"[size], 8 - size) == 0);
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        }
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      else
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        {
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          ASSERT (memcmp (buf, "12345\0EF", 8) == 0);
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        }
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    }
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  /* Test the support of the POSIX/XSI format strings with positions.  */
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  {
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    char result[100];
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    retval = snprintf (result, sizeof (result), "%2$d %1$d", 33, 55);
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    ASSERT (strcmp (result, "55 33") == 0);
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    ASSERT (retval == strlen (result));
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  }
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  return 0;
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}