Port: Add compat for strnlen and strndup
[babeltrace.git] / formats / ctf / types / string.c
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1/*
2 * Common Trace Format
3 *
4 * Strings read/write functions.
5 *
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6 * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
7 *
8 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6dc2ca62 9 *
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10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
de0ba614 16 *
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17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
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19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26 * SOFTWARE.
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27 */
28
70bd0a12 29#include <babeltrace/babeltrace-internal.h>
d79865b9 30#include <babeltrace/ctf/types.h>
a3dbc794 31#include <limits.h> /* C99 limits */
5ea98697 32#include <babeltrace/compat/string.h>
6dc2ca62 33
0d69b916 34int ctf_string_read(struct bt_stream_pos *ppos, struct bt_definition *definition)
a52d7f6a 35{
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36 struct definition_string *string_definition =
37 container_of(definition, struct definition_string, p);
38 const struct declaration_string *string_declaration =
39 string_definition->declaration;
40 struct ctf_stream_pos *pos = ctf_pos(ppos);
a52d7f6a 41 size_t len;
7aefd77d 42 ssize_t max_len_bits;
47e0f2e2 43 char *srcaddr;
a52d7f6a 44
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45 if (!ctf_align_pos(pos, string_declaration->p.alignment))
46 return -EFAULT;
c5e74408 47
d11e9c49 48 srcaddr = ctf_get_pos_addr(pos);
670977d3 49 if (pos->offset == EOF)
df752f35 50 return -EFAULT;
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51 /* Not counting \0. Counting in bits. */
52 max_len_bits = pos->packet_size - pos->offset - CHAR_BIT;
53 if (max_len_bits < 0)
c5e74408 54 return -EFAULT;
7aefd77d 55 /* Add \0, counting in bytes. */
5ea98697 56 len = bt_strnlen(srcaddr, (size_t) max_len_bits / CHAR_BIT) + 1;
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57 /* Truncated string, unexpected. Trace probably corrupted. */
58 if (srcaddr[len - 1] != '\0')
59 return -EFAULT;
60
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61 if (string_definition->alloc_len < len) {
62 string_definition->value =
63 g_realloc(string_definition->value, len);
64 string_definition->alloc_len = len;
65 }
847bf71a 66 printf_debug("CTF string read %s\n", srcaddr);
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67 memcpy(string_definition->value, srcaddr, len);
68 string_definition->len = len;
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69 if (!ctf_move_pos(pos, len * CHAR_BIT))
70 return -EFAULT;
c5e74408 71 return 0;
6dc2ca62 72}
a52d7f6a 73
1cf393f6 74int ctf_string_write(struct bt_stream_pos *ppos,
0d69b916 75 struct bt_definition *definition)
a52d7f6a 76{
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77 struct definition_string *string_definition =
78 container_of(definition, struct definition_string, p);
79 const struct declaration_string *string_declaration =
80 string_definition->declaration;
81 struct ctf_stream_pos *pos = ctf_pos(ppos);
a52d7f6a 82 size_t len;
47e0f2e2 83 char *destaddr;
a52d7f6a 84
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85 if (!ctf_align_pos(pos, string_declaration->p.alignment))
86 return -EFAULT;
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87 assert(string_definition->value != NULL);
88 len = string_definition->len;
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89
90 if (!ctf_pos_access_ok(pos, len))
91 return -EFAULT;
92
d11e9c49 93 if (pos->dummy)
a52d7f6a 94 goto end;
d11e9c49 95 destaddr = ctf_get_pos_addr(pos);
8563e754 96 memcpy(destaddr, string_definition->value, len);
a52d7f6a 97end:
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98 if (!ctf_move_pos(pos, len * CHAR_BIT))
99 return -EFAULT;
c5e74408 100 return 0;
a52d7f6a 101}
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