Port: Add compat for strnlen and strndup
[babeltrace.git] / formats / ctf / types / string.c
1 /*
2 * Common Trace Format
3 *
4 * Strings read/write functions.
5 *
6 * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
7 *
8 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 *
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:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
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.
27 */
28
29 #include <babeltrace/babeltrace-internal.h>
30 #include <babeltrace/ctf/types.h>
31 #include <limits.h> /* C99 limits */
32 #include <babeltrace/compat/string.h>
33
34 int ctf_string_read(struct bt_stream_pos *ppos, struct bt_definition *definition)
35 {
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);
41 size_t len;
42 ssize_t max_len_bits;
43 char *srcaddr;
44
45 if (!ctf_align_pos(pos, string_declaration->p.alignment))
46 return -EFAULT;
47
48 srcaddr = ctf_get_pos_addr(pos);
49 if (pos->offset == EOF)
50 return -EFAULT;
51 /* Not counting \0. Counting in bits. */
52 max_len_bits = pos->packet_size - pos->offset - CHAR_BIT;
53 if (max_len_bits < 0)
54 return -EFAULT;
55 /* Add \0, counting in bytes. */
56 len = bt_strnlen(srcaddr, (size_t) max_len_bits / CHAR_BIT) + 1;
57 /* Truncated string, unexpected. Trace probably corrupted. */
58 if (srcaddr[len - 1] != '\0')
59 return -EFAULT;
60
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 }
66 printf_debug("CTF string read %s\n", srcaddr);
67 memcpy(string_definition->value, srcaddr, len);
68 string_definition->len = len;
69 if (!ctf_move_pos(pos, len * CHAR_BIT))
70 return -EFAULT;
71 return 0;
72 }
73
74 int ctf_string_write(struct bt_stream_pos *ppos,
75 struct bt_definition *definition)
76 {
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);
82 size_t len;
83 char *destaddr;
84
85 if (!ctf_align_pos(pos, string_declaration->p.alignment))
86 return -EFAULT;
87 assert(string_definition->value != NULL);
88 len = string_definition->len;
89
90 if (!ctf_pos_access_ok(pos, len))
91 return -EFAULT;
92
93 if (pos->dummy)
94 goto end;
95 destaddr = ctf_get_pos_addr(pos);
96 memcpy(destaddr, string_definition->value, len);
97 end:
98 if (!ctf_move_pos(pos, len * CHAR_BIT))
99 return -EFAULT;
100 return 0;
101 }
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