lib/vasprintf.c

   1 /*
   2 * Copyright (C) 2009 Toni Gundogdu.
   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 <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <stdio.h>
  19 #include <stdarg.h>
  20 #include <stdlib.h>
  21
  22 int vasprintf(char **dst, const char *fmt, va_list ap)
  23 {
  24   va_list apc;
  25   int len;
  26   char *p;
  27
  28   va_copy(apc, ap);
  29   len = vsnprintf(0, 0, fmt, apc) + 1;
  30   va_end(apc);
  31
  32   *dst = p = malloc(len);
  33   if (!p)
  34     return (-1);
  35
  36   return (vsnprintf(p, len, fmt, ap));
  37 }