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[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 <string.h>
33
34 int ctf_string_read(struct stream_pos *ppos, struct 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;
43 char *srcaddr;
44
45 ctf_align_pos(pos, string_declaration->p.alignment);
46
47 srcaddr = ctf_get_pos_addr(pos);
48 if (pos->offset == EOF)
49 return -EFAULT;
50 /* Not counting \0 */
51 max_len = pos->packet_size - pos->offset - 1;
52 if (max_len < 0)
53 return -EFAULT;
54 len = strnlen(srcaddr, max_len) + 1; /* Add \0 */
55 /* Truncated string, unexpected. Trace probably corrupted. */
56 if (srcaddr[len - 1] != '\0')
57 return -EFAULT;
58
59 if (string_definition->alloc_len < len) {
60 string_definition->value =
61 g_realloc(string_definition->value, len);
62 string_definition->alloc_len = len;
63 }
64 printf_debug("CTF string read %s\n", srcaddr);
65 memcpy(string_definition->value, srcaddr, len);
66 string_definition->len = len;
67 ctf_move_pos(pos, len * CHAR_BIT);
68 return 0;
69 }
70
71 int ctf_string_write(struct stream_pos *ppos,
72 struct definition *definition)
73 {
74 struct definition_string *string_definition =
75 container_of(definition, struct definition_string, p);
76 const struct declaration_string *string_declaration =
77 string_definition->declaration;
78 struct ctf_stream_pos *pos = ctf_pos(ppos);
79 size_t len;
80 char *destaddr;
81
82 ctf_align_pos(pos, string_declaration->p.alignment);
83 assert(string_definition->value != NULL);
84 len = string_definition->len;
85
86 if (!ctf_pos_access_ok(pos, len))
87 return -EFAULT;
88
89 if (pos->dummy)
90 goto end;
91 destaddr = ctf_get_pos_addr(pos);
92 memcpy(destaddr, string_definition->value, len);
93 end:
94 ctf_move_pos(pos, len * CHAR_BIT);
95 return 0;
96 }
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