glibc/support/xmemstream.c

/* Error-checking wrappers for memstream functions.
   Copyright (C) 2016-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <support/xmemstream.h>

#include <errno.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/xstdio.h>

void
xopen_memstream (struct xmemstream *stream)
{
  int old_errno = errno;
  *stream = (struct xmemstream) {};
  stream->out = open_memstream (&stream->buffer, &stream->length);
  if (stream->out == NULL)
    FAIL_EXIT1 ("open_memstream: %m");
  errno = old_errno;
}

void
xfclose_memstream (struct xmemstream *stream)
{
  xfclose (stream->out);
  stream->out = NULL;
}