1 /* $NetBSD: libdwarf_str.c,v 1.4 2022/05/01 17:20:47 jkoshy Exp $ */
2
3 /*-
4 * Copyright (c) 2009,2010 Kai Wang
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "_libdwarf.h"
30
31 __RCSID("$NetBSD: libdwarf_str.c,v 1.4 2022/05/01 17:20:47 jkoshy Exp $");
32 ELFTC_VCSID("Id: libdwarf_str.c 2070 2011-10-27 03:05:32Z jkoshy");
33
34 #define _INIT_DWARF_STRTAB_SIZE 1024
35
36 int
_dwarf_strtab_add(Dwarf_Debug dbg,char * string,uint64_t * off,Dwarf_Error * error)37 _dwarf_strtab_add(Dwarf_Debug dbg, char *string, uint64_t *off,
38 Dwarf_Error *error)
39 {
40 size_t len;
41
42 assert(dbg != NULL && string != NULL);
43
44 len = strlen(string) + 1;
45 while (dbg->dbg_strtab_size + len > dbg->dbg_strtab_cap) {
46 dbg->dbg_strtab_cap *= 2;
47 dbg->dbg_strtab = realloc(dbg->dbg_strtab,
48 (size_t) dbg->dbg_strtab_cap);
49 if (dbg->dbg_strtab == NULL) {
50 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
51 return (DW_DLE_MEMORY);
52 }
53 }
54
55 if (off != NULL)
56 *off = dbg->dbg_strtab_size;
57
58 strncpy(&dbg->dbg_strtab[dbg->dbg_strtab_size], string, len - 1);
59 dbg->dbg_strtab_size += len;
60 dbg->dbg_strtab[dbg->dbg_strtab_size - 1] = '\0';
61
62 return (DW_DLE_NONE);
63 }
64
65 char *
_dwarf_strtab_get_table(Dwarf_Debug dbg)66 _dwarf_strtab_get_table(Dwarf_Debug dbg)
67 {
68
69 assert(dbg != NULL);
70
71 return (dbg->dbg_strtab);
72 }
73
74 int
_dwarf_strtab_init(Dwarf_Debug dbg,Dwarf_Error * error)75 _dwarf_strtab_init(Dwarf_Debug dbg, Dwarf_Error *error)
76 {
77 Dwarf_Section *ds;
78
79 assert(dbg != NULL);
80
81 if (dbg->dbg_mode == DW_DLC_READ || dbg->dbg_mode == DW_DLC_RDWR) {
82 ds = _dwarf_find_section(dbg, ".debug_str");
83 if (ds == NULL) {
84 dbg->dbg_strtab = NULL;
85 dbg->dbg_strtab_cap = dbg->dbg_strtab_size = 0;
86 return (DW_DLE_NONE);
87 }
88
89 dbg->dbg_strtab_cap = dbg->dbg_strtab_size = ds->ds_size;
90
91 if (dbg->dbg_mode == DW_DLC_RDWR) {
92 if ((dbg->dbg_strtab = malloc((size_t) ds->ds_size)) ==
93 NULL) {
94 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
95 return (DW_DLE_MEMORY);
96 }
97 memcpy(dbg->dbg_strtab, ds->ds_data, ds->ds_size);
98 } else
99 dbg->dbg_strtab = (char *) ds->ds_data;
100 } else {
101 /* DW_DLC_WRITE */
102
103 dbg->dbg_strtab_cap = _INIT_DWARF_STRTAB_SIZE;
104 dbg->dbg_strtab_size = 0;
105
106 if ((dbg->dbg_strtab = malloc((size_t) dbg->dbg_strtab_cap)) ==
107 NULL) {
108 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
109 return (DW_DLE_MEMORY);
110 }
111
112 dbg->dbg_strtab[0] = '\0';
113 }
114
115 return (DW_DLE_NONE);
116 }
117
118 void
_dwarf_strtab_cleanup(Dwarf_Debug dbg)119 _dwarf_strtab_cleanup(Dwarf_Debug dbg)
120 {
121
122 assert(dbg != NULL);
123
124 if (dbg->dbg_mode == DW_DLC_RDWR || dbg->dbg_mode == DW_DLC_WRITE)
125 free(dbg->dbg_strtab);
126 }
127
128 int
_dwarf_strtab_gen(Dwarf_P_Debug dbg,Dwarf_Error * error)129 _dwarf_strtab_gen(Dwarf_P_Debug dbg, Dwarf_Error *error)
130 {
131 Dwarf_P_Section ds;
132 int ret;
133
134 assert(dbg != NULL);
135
136 if ((ret = _dwarf_section_init(dbg, &ds, ".debug_str", 0, error)) !=
137 DW_DLE_NONE)
138 return (ret);
139
140 if (dbg->dbg_strtab_size > ds->ds_cap) {
141 ds->ds_data = realloc(ds->ds_data,
142 (size_t) dbg->dbg_strtab_size);
143 if (ds->ds_data == NULL) {
144 _dwarf_section_free(dbg, &ds);
145 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
146 return (DW_DLE_MEMORY);
147 }
148 ds->ds_cap = dbg->dbg_strtab_size;
149 }
150
151 memcpy(ds->ds_data, dbg->dbg_strtab, dbg->dbg_strtab_size);
152 ds->ds_size = dbg->dbg_strtab_size;
153
154 /*
155 * Inform application the creation of .debug_str ELF section.
156 * Note that .debug_str use a different format than usual ELF
157 * string table, so it should not have SHT_STRTAB as its type.
158 */
159 ret = _dwarf_section_callback(dbg, ds, SHT_PROGBITS, 0, 0, 0, error);
160
161 return (ret);
162 }
163