support/xmemstream.c

   1 /* Error-checking wrappers for memstream functions.
   2    Copyright (C) 2016-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/xmemstream.h>
  20
  21 #include <errno.h>
  22 #include <stdlib.h>
  23 #include <support/check.h>
  24 #include <support/xstdio.h>
  25
  26 void
  27 xopen_memstream (struct xmemstream *stream)
  28 {
  29   int old_errno = errno;
  30   *stream = (struct xmemstream) {};
  31   stream->out = open_memstream (&stream->buffer, &stream->length);
  32   if (stream->out == NULL)
  33     FAIL_EXIT1 ("open_memstream: %m");
  34   errno = old_errno;
  35 }
  36
  37 void
  38 xfclose_memstream (struct xmemstream *stream)
  39 {
  40   xfclose (stream->out);
  41   stream->out = NULL;
  42 }