lib/vasprintf.c

   1 /* Formatted output to strings.
   2    Copyright (C) 1999, 2002, 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 #include <config.h>
  18
  19 /* Specification.  */
  20 #ifdef IN_LIBASPRINTF
  21 # include "vasprintf.h"
  22 #else
  23 # include <stdio.h>
  24 #endif
  25
  26 #include <errno.h>
  27 #include <limits.h>
  28 #include <stdint.h>
  29 #include <stdlib.h>
  30
  31 #include "vasnprintf.h"
  32
  33 int
  34 vasprintf (char **resultp, const char *format, va_list args)
  35 {
  36   size_t length;
  37   char *result = vasnprintf (NULL, &length, format, args);
  38   if (result == NULL)
  39     return -1;
  40
  41 #if PTRDIFF_MAX > INT_MAX
  42   if (length > INT_MAX)
  43     {
  44       free (result);
  45       errno = (length > PTRDIFF_MAX ? ENOMEM : EOVERFLOW);
  46       return -1;
  47     }
  48 #else
  49   if (length > PTRDIFF_MAX)
  50     {
  51       free (result);
  52       errno = ENOMEM;
  53       return -1;
  54     }
  55 #endif
  56
  57   *resultp = result;
  58   /* Return the number of resulting bytes, excluding the trailing NUL.  */
  59   return length;
  60 }