lib/gl/vasprintf.c

   1 /* Formatted output to strings.
   2    Copyright (C) 1999, 2002, 2006-2007 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 Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1, or (at your option)
   7    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 Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License along
  15    with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #ifdef IN_LIBASPRINTF
  22 # include "vasprintf.h"
  23 #else
  24 # include <stdio.h>
  25 #endif
  26
  27 #include <errno.h>
  28 #include <limits.h>
  29 #include <stdlib.h>
  30
  31 #include "vasnprintf.h"
  32
  33 /* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW.  */
  34 #ifndef EOVERFLOW
  35 # define EOVERFLOW E2BIG
  36 #endif
  37
  38 int
  39 vasprintf (char **resultp, const char *format, va_list args)
  40 {
  41   size_t length;
  42   char *result = vasnprintf (NULL, &length, format, args);
  43   if (result == NULL)
  44     return -1;
  45
  46   if (length > INT_MAX)
  47     {
  48       free (result);
  49       errno = EOVERFLOW;
  50       return -1;
  51     }
  52
  53   *resultp = result;
  54   /* Return the number of resulting bytes, excluding the trailing NUL.  */
  55   return length;
  56 }