| 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 | } |