3b54a2df680ea5acffbba3c6f932aff1f2da096c
[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
21 #include <babeltrace/babeltrace-internal.h>
22 #include <babeltrace/ctf/types.h>
23 #include <limits.h> /* C99 limits */
24 #include <string.h>
25
26 int ctf_string_read(struct stream_pos *ppos, struct definition *definition)
27 {
28 struct definition_string *string_definition =
29 container_of(definition, struct definition_string, p);
30 const struct declaration_string *string_declaration =
31 string_definition->declaration;
32 struct ctf_stream_pos *pos = ctf_pos(ppos);
33 size_t len;
34 ssize_t max_len;
35 char *srcaddr;
36
37 ctf_align_pos(pos, string_declaration->p.alignment);
38
39 srcaddr = ctf_get_pos_addr(pos);
40 if (pos->offset == EOF)
41 return -EFAULT;
42 /* Not counting \0 */
43 max_len = pos->packet_size - pos->offset - 1;
44 if (max_len < 0)
45 return -EFAULT;
46 len = strnlen(srcaddr, max_len) + 1; /* Add \0 */
47 /* Truncated string, unexpected. Trace probably corrupted. */
48 if (srcaddr[len - 1] != '\0')
49 return -EFAULT;
50
51 if (string_definition->alloc_len < len) {
52 string_definition->value =
53 g_realloc(string_definition->value, len);
54 string_definition->alloc_len = len;
55 }
56 printf_debug("CTF string read %s\n", srcaddr);
57 memcpy(string_definition->value, srcaddr, len);
58 string_definition->len = len;
59 ctf_move_pos(pos, len * CHAR_BIT);
60 return 0;
61 }
62
63 int ctf_string_write(struct stream_pos *ppos,
64 struct definition *definition)
65 {
66 struct definition_string *string_definition =
67 container_of(definition, struct definition_string, p);
68 const struct declaration_string *string_declaration =
69 string_definition->declaration;
70 struct ctf_stream_pos *pos = ctf_pos(ppos);
71 size_t len;
72 char *destaddr;
73
74 ctf_align_pos(pos, string_declaration->p.alignment);
75 assert(string_definition->value != NULL);
76 len = string_definition->len;
77
78 if (!ctf_pos_access_ok(pos, len))
79 return -EFAULT;
80
81 if (pos->dummy)
82 goto end;
83 destaddr = ctf_get_pos_addr(pos);
84 memcpy(destaddr, string_definition->value, len);
85 end:
86 ctf_move_pos(pos, len * CHAR_BIT);
87 return 0;
88 }
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