1 /*-
2 * Copyright (c) 2009,2010 Kai Wang
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "_libdwarf.h"
28
29 ELFTC_VCSID("$Id: libdwarf_str.c 2070 2011-10-27 03:05:32Z jkoshy $");
30
31 #define _INIT_DWARF_STRTAB_SIZE 1024
32
33 int
_dwarf_strtab_add(Dwarf_Debug dbg,char * string,uint64_t * off,Dwarf_Error * error)34 _dwarf_strtab_add(Dwarf_Debug dbg, char *string, uint64_t *off,
35 Dwarf_Error *error)
36 {
37 size_t len;
38
39 assert(dbg != NULL && string != NULL);
40
41 len = strlen(string) + 1;
42 while (dbg->dbg_strtab_size + len > dbg->dbg_strtab_cap) {
43 dbg->dbg_strtab_cap *= 2;
44 dbg->dbg_strtab = realloc(dbg->dbg_strtab,
45 (size_t) dbg->dbg_strtab_cap);
46 if (dbg->dbg_strtab == NULL) {
47 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
48 return (DW_DLE_MEMORY);
49 }
50 }
51
52 if (off != NULL)
53 *off = dbg->dbg_strtab_size;
54
55 strncpy(&dbg->dbg_strtab[dbg->dbg_strtab_size], string, len - 1);
56 dbg->dbg_strtab_size += len;
57 dbg->dbg_strtab[dbg->dbg_strtab_size - 1] = '\0';
58
59 return (DW_DLE_NONE);
60 }
61
62 char *
_dwarf_strtab_get_table(Dwarf_Debug dbg)63 _dwarf_strtab_get_table(Dwarf_Debug dbg)
64 {
65
66 assert(dbg != NULL);
67
68 return (dbg->dbg_strtab);
69 }
70
71 int
_dwarf_strtab_init(Dwarf_Debug dbg,Dwarf_Error * error)72 _dwarf_strtab_init(Dwarf_Debug dbg, Dwarf_Error *error)
73 {
74 Dwarf_Section *ds;
75
76 assert(dbg != NULL);
77
78 if (dbg->dbg_mode == DW_DLC_READ || dbg->dbg_mode == DW_DLC_RDWR) {
79 ds = _dwarf_find_section(dbg, ".debug_str");
80 if (ds == NULL) {
81 dbg->dbg_strtab = NULL;
82 dbg->dbg_strtab_cap = dbg->dbg_strtab_size = 0;
83 return (DW_DLE_NONE);
84 }
85
86 dbg->dbg_strtab_cap = dbg->dbg_strtab_size = ds->ds_size;
87
88 if (dbg->dbg_mode == DW_DLC_RDWR) {
89 if ((dbg->dbg_strtab = malloc((size_t) ds->ds_size)) ==
90 NULL) {
91 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
92 return (DW_DLE_MEMORY);
93 }
94 memcpy(dbg->dbg_strtab, ds->ds_data, ds->ds_size);
95 } else
96 dbg->dbg_strtab = (char *) ds->ds_data;
97 } else {
98 /* DW_DLC_WRITE */
99
100 dbg->dbg_strtab_cap = _INIT_DWARF_STRTAB_SIZE;
101 dbg->dbg_strtab_size = 0;
102
103 if ((dbg->dbg_strtab = malloc((size_t) dbg->dbg_strtab_cap)) ==
104 NULL) {
105 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
106 return (DW_DLE_MEMORY);
107 }
108
109 dbg->dbg_strtab[0] = '\0';
110 }
111
112 return (DW_DLE_NONE);
113 }
114
115 void
_dwarf_strtab_cleanup(Dwarf_Debug dbg)116 _dwarf_strtab_cleanup(Dwarf_Debug dbg)
117 {
118
119 assert(dbg != NULL);
120
121 if (dbg->dbg_mode == DW_DLC_RDWR || dbg->dbg_mode == DW_DLC_WRITE)
122 free(dbg->dbg_strtab);
123 }
124
125 int
_dwarf_strtab_gen(Dwarf_P_Debug dbg,Dwarf_Error * error)126 _dwarf_strtab_gen(Dwarf_P_Debug dbg, Dwarf_Error *error)
127 {
128 Dwarf_P_Section ds;
129 int ret;
130
131 assert(dbg != NULL);
132
133 if ((ret = _dwarf_section_init(dbg, &ds, ".debug_str", 0, error)) !=
134 DW_DLE_NONE)
135 return (ret);
136
137 if (dbg->dbg_strtab_size > ds->ds_cap) {
138 ds->ds_data = realloc(ds->ds_data,
139 (size_t) dbg->dbg_strtab_size);
140 if (ds->ds_data == NULL) {
141 _dwarf_section_free(dbg, &ds);
142 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
143 return (DW_DLE_MEMORY);
144 }
145 ds->ds_cap = dbg->dbg_strtab_size;
146 }
147
148 memcpy(ds->ds_data, dbg->dbg_strtab, dbg->dbg_strtab_size);
149 ds->ds_size = dbg->dbg_strtab_size;
150
151 /*
152 * Inform application the creation of .debug_str ELF section.
153 * Note that .debug_str use a different format than usual ELF
154 * string table, so it should not have SHT_STRTAB as its type.
155 */
156 ret = _dwarf_section_callback(dbg, ds, SHT_PROGBITS, 0, 0, 0, error);
157
158 return (ret);
159 }
160