lib/vsnprintf.c

   1 /* Formatted output to strings.
   2    Copyright (C) 2004, 2006-2024 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 #ifdef HAVE_CONFIG_H
  18 # include <config.h>
  19 #endif
  20
  21 /* Specification.  */
  22 #include <stdio.h>
  23
  24 #include <errno.h>
  25 #include <limits.h>
  26 #include <stdarg.h>
  27 #include <stdint.h>
  28
  29 int
  30 vsnprintf (char *str, size_t size, const char *format, va_list args)
  31 {
  32   ptrdiff_t ret = vsnzprintf (str, size, format, args);
  33
  34 #if PTRDIFF_MAX > INT_MAX
  35   if (ret > INT_MAX)
  36     {
  37       errno = EOVERFLOW;
  38       return -1;
  39     }
  40 #endif
  41
  42   return ret;
  43 }