lib/unistdio/u-vasprintf.h

   1 /* Formatted output to strings.
   2    Copyright (C) 1999, 2002, 2006-2025 Free Software Foundation, Inc.
   3
   4    This file is free software.
   5    It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
   6    You can redistribute it and/or modify it under either
   7      - the terms of the GNU Lesser General Public License as published
   8        by the Free Software Foundation, either version 3, or (at your
   9        option) any later version, or
  10      - the terms of the GNU General Public License as published by the
  11        Free Software Foundation; either version 2, or (at your option)
  12        any later version, or
  13      - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
  14
  15    This file is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License and the GNU General Public License
  19    for more details.
  20
  21    You should have received a copy of the GNU Lesser General Public
  22    License and of the GNU General Public License along with this
  23    program.  If not, see <https://www.gnu.org/licenses/>.  */
  24
  25 int
  26 VASPRINTF (DCHAR_T **resultp, const FCHAR_T *format, va_list args)
  27 {
  28   size_t length;
  29   DCHAR_T *result = VASNPRINTF (NULL, &length, format, args);
  30   if (result == NULL)
  31     return -1;
  32
  33   if (length > INT_MAX)
  34     {
  35       free (result);
  36       errno = EOVERFLOW;
  37       return -1;
  38     }
  39
  40   *resultp = result;
  41   /* Return the number of resulting units, excluding the trailing NUL.  */
  42   return length;
  43 }