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
31 int
memstream_init(struct memstream * memstream)32 memstream_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
44 int
memstream_close(struct memstream * memstream)45 memstream_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
69 void
memstream_destroy(struct memstream * memstream)70 memstream_destroy(struct memstream *memstream)
71 {
72 free(memstream->buf);
73 }
74