lib/vasprintf.c

   1 /* Formatted output to strings.
   2    Copyright (C) 1999, 2002, 2006-2017 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 2, 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License along
  15    with this program; if not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #ifdef IN_LIBASPRINTF
  21 # include "vasprintf.h"
  22 #else
  23 # include <stdio.h>
  24 #endif
  25
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <stdlib.h>
  29
  30 #include "vasnprintf.h"
  31
  32 int
  33 vasprintf (char **resultp, const char *format, va_list args)
  34 {
  35   size_t length;
  36   char *result = vasnprintf (NULL, &length, format, args);
  37   if (result == NULL)
  38     return -1;
  39
  40   if (length > INT_MAX)
  41     {
  42       free (result);
  43       errno = EOVERFLOW;
  44       return -1;
  45     }
  46
  47   *resultp = result;
  48   /* Return the number of resulting bytes, excluding the trailing NUL.  */
  49   return length;
  50 }