lib/vaszprintf.c

   1 /* Formatted output to strings.
   2    Copyright (C) 1999-2024 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    This file 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
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <stdio.h>
  21
  22 #include <errno.h>
  23 #include <stdint.h>
  24 #include <stdlib.h>
  25
  26 #include "vasnprintf.h"
  27
  28 ptrdiff_t
  29 vaszprintf (char **resultp, const char *format, va_list args)
  30 {
  31   size_t length;
  32   char *result = vasnprintf (NULL, &length, format, args);
  33   if (result == NULL)
  34     return -1;
  35
  36   if (length > PTRDIFF_MAX)
  37     {
  38       free (result);
  39       errno = ENOMEM;
  40       return -1;
  41     }
  42
  43   *resultp = result;
  44   /* Return the number of resulting bytes, excluding the trailing NUL.  */
  45   return length;
  46 }