1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2012 Petr Machata, Red Hat Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 */
20
21/* _GNU_SOURCE may be necessary for open_memstream visibility (see
22 * configure.ac), and there's no harm defining it just in case.  */
23#define _GNU_SOURCE
24
25#include <stdio.h>
26#include <stdlib.h>
27
28#include "config.h"
29#include "memstream.h"
30
31int
32memstream_init(struct memstream *memstream)
33{
34#if HAVE_OPEN_MEMSTREAM
35	memstream->stream = open_memstream(&memstream->buf,
36					   &memstream->size);
37#else
38	memstream->stream = tmpfile();
39	memstream->buf = NULL;
40#endif
41	return memstream->stream != NULL ? 0 : -1;
42}
43
44int
45memstream_close(struct memstream *memstream)
46{
47#if !defined(HAVE_OPEN_MEMSTREAM) || !HAVE_OPEN_MEMSTREAM
48	if (fseek(memstream->stream, 0, SEEK_END) < 0) {
49	fail:
50		fclose(memstream->stream);
51		return -1;
52	}
53	memstream->size = ftell(memstream->stream);
54	if (memstream->size == (size_t)-1)
55		goto fail;
56	memstream->buf = malloc(memstream->size);
57	if (memstream->buf == NULL)
58		goto fail;
59
60	rewind(memstream->stream);
61	if (fread(memstream->buf, 1, memstream->size, memstream->stream)
62	    < memstream->size)
63		goto fail;
64#endif
65
66	return fclose(memstream->stream) == 0 ? 0 : -1;
67}
68
69void
70memstream_destroy(struct memstream *memstream)
71{
72	free(memstream->buf);
73}
74