lib/c-vasprintf.c

   1 /* Formatted output to strings in C locale.
   2    Copyright (C) 1999, 2002, 2006-2025 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 "c-vasprintf.h"
  21
  22 #include <errno.h>
  23 #include <limits.h>
  24 #include <stdint.h>
  25 #include <stdlib.h>
  26
  27 #include "c-vasnprintf.h"
  28
  29 int
  30 c_vasprintf (char **resultp, const char *format, va_list args)
  31 {
  32   size_t length;
  33   char *result = c_vasnprintf (NULL, &length, format, args);
  34   if (result == NULL)
  35     return -1;
  36
  37 #if PTRDIFF_MAX > INT_MAX
  38   if (length > INT_MAX)
  39     {
  40       free (result);
  41       errno = (length > PTRDIFF_MAX ? ENOMEM : EOVERFLOW);
  42       return -1;
  43     }
  44 #else
  45   if (length > PTRDIFF_MAX)
  46     {
  47       free (result);
  48       errno = ENOMEM;
  49       return -1;
  50     }
  51 #endif
  52
  53   *resultp = result;
  54   /* Return the number of resulting bytes, excluding the trailing NUL.  */
  55   return length;
  56 }