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ccc6cda3 JA |
1 | /* xmalloc.c -- safe versions of malloc and realloc */ |
2 | ||
3185942a | 3 | /* Copyright (C) 1991-2009 Free Software Foundation, Inc. |
ccc6cda3 | 4 | |
3185942a | 5 | This file is part of GNU Bash, the GNU Bourne Again SHell. |
ccc6cda3 | 6 | |
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
ccc6cda3 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
ccc6cda3 JA |
16 | |
17 | You should have received a copy of the GNU General Public License | |
3185942a JA |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
19 | */ | |
ccc6cda3 JA |
20 | |
21 | #if defined (HAVE_CONFIG_H) | |
22 | #include <config.h> | |
23 | #endif | |
24 | ||
d166f048 | 25 | #include "bashtypes.h" |
ccc6cda3 JA |
26 | #include <stdio.h> |
27 | ||
28 | #if defined (HAVE_UNISTD_H) | |
29 | # include <unistd.h> | |
30 | #endif | |
31 | ||
32 | #if defined (HAVE_STDLIB_H) | |
33 | # include <stdlib.h> | |
34 | #else | |
35 | # include "ansi_stdlib.h" | |
36 | #endif /* HAVE_STDLIB_H */ | |
37 | ||
38 | #include "error.h" | |
39 | ||
b80f6443 JA |
40 | #include "bashintl.h" |
41 | ||
ccc6cda3 JA |
42 | #if !defined (PTR_T) |
43 | # if defined (__STDC__) | |
44 | # define PTR_T void * | |
45 | # else | |
46 | # define PTR_T char * | |
47 | # endif /* !__STDC__ */ | |
48 | #endif /* !PTR_T */ | |
49 | ||
f73dda09 | 50 | #if defined (HAVE_SBRK) && !HAVE_DECL_SBRK |
ccc6cda3 JA |
51 | extern char *sbrk(); |
52 | #endif | |
53 | ||
54 | static PTR_T lbreak; | |
55 | static int brkfound; | |
56 | static size_t allocated; | |
57 | ||
58 | /* **************************************************************** */ | |
59 | /* */ | |
60 | /* Memory Allocation and Deallocation. */ | |
61 | /* */ | |
62 | /* **************************************************************** */ | |
63 | ||
b72432fd | 64 | #if defined (HAVE_SBRK) |
0001803f CR |
65 | #define FINDBRK() \ |
66 | do { \ | |
67 | if (brkfound == 0) \ | |
68 | { \ | |
69 | lbreak = (PTR_T)sbrk (0); \ | |
70 | brkfound++; \ | |
71 | } \ | |
72 | } while (0) | |
73 | ||
b72432fd JA |
74 | static size_t |
75 | findbrk () | |
76 | { | |
0001803f | 77 | FINDBRK(); |
b72432fd JA |
78 | return (char *)sbrk (0) - (char *)lbreak; |
79 | } | |
0001803f CR |
80 | #else |
81 | #define FINDBRK() | |
b72432fd JA |
82 | #endif |
83 | ||
0001803f CR |
84 | static void |
85 | allocerr (func, bytes) | |
86 | const char *func; | |
87 | size_t bytes; | |
88 | { | |
89 | #if defined (HAVE_SBRK) | |
90 | allocated = findbrk (); | |
91 | fatal_error (_("%s: cannot allocate %lu bytes (%lu bytes allocated)"), func, (unsigned long)bytes, (unsigned long)allocated); | |
92 | #else | |
93 | fatal_error (_("%s: cannot allocate %lu bytes"), func, (unsigned long)bytes); | |
94 | #endif /* !HAVE_SBRK */ | |
95 | } | |
96 | ||
ccc6cda3 JA |
97 | /* Return a pointer to free()able block of memory large enough |
98 | to hold BYTES number of bytes. If the memory cannot be allocated, | |
99 | print an error message and abort. */ | |
f73dda09 | 100 | PTR_T |
ccc6cda3 JA |
101 | xmalloc (bytes) |
102 | size_t bytes; | |
103 | { | |
f73dda09 | 104 | PTR_T temp; |
ccc6cda3 | 105 | |
0001803f CR |
106 | #if defined (DEBUG) |
107 | if (bytes == 0) | |
108 | internal_warning("xmalloc: size argument is 0"); | |
109 | #endif | |
110 | ||
111 | FINDBRK(); | |
f73dda09 | 112 | temp = malloc (bytes); |
ccc6cda3 JA |
113 | |
114 | if (temp == 0) | |
0001803f | 115 | allocerr ("xmalloc", bytes); |
ccc6cda3 JA |
116 | |
117 | return (temp); | |
118 | } | |
119 | ||
f73dda09 | 120 | PTR_T |
ccc6cda3 JA |
121 | xrealloc (pointer, bytes) |
122 | PTR_T pointer; | |
123 | size_t bytes; | |
124 | { | |
f73dda09 | 125 | PTR_T temp; |
ccc6cda3 | 126 | |
0001803f CR |
127 | #if defined (DEBUG) |
128 | if (bytes == 0) | |
129 | internal_warning("xrealloc: size argument is 0"); | |
130 | #endif | |
131 | ||
132 | FINDBRK(); | |
f73dda09 | 133 | temp = pointer ? realloc (pointer, bytes) : malloc (bytes); |
ccc6cda3 JA |
134 | |
135 | if (temp == 0) | |
0001803f | 136 | allocerr ("xrealloc", bytes); |
ccc6cda3 JA |
137 | |
138 | return (temp); | |
139 | } | |
140 | ||
141 | /* Use this as the function to call when adding unwind protects so we | |
142 | don't need to know what free() returns. */ | |
143 | void | |
144 | xfree (string) | |
bb70624e | 145 | PTR_T string; |
ccc6cda3 JA |
146 | { |
147 | if (string) | |
148 | free (string); | |
149 | } | |
f73dda09 JA |
150 | |
151 | #ifdef USING_BASH_MALLOC | |
152 | #include <malloc/shmalloc.h> | |
153 | ||
0001803f CR |
154 | static void |
155 | sh_allocerr (func, bytes, file, line) | |
156 | const char *func; | |
157 | size_t bytes; | |
158 | char *file; | |
159 | int line; | |
160 | { | |
161 | #if defined (HAVE_SBRK) | |
162 | allocated = findbrk (); | |
163 | fatal_error (_("%s: %s:%d: cannot allocate %lu bytes (%lu bytes allocated)"), func, file, line, (unsigned long)bytes, (unsigned long)allocated); | |
164 | #else | |
165 | fatal_error (_("%s: %s:%d: cannot allocate %lu bytes"), func, file, line, (unsigned long)bytes); | |
166 | #endif /* !HAVE_SBRK */ | |
167 | } | |
168 | ||
f73dda09 JA |
169 | PTR_T |
170 | sh_xmalloc (bytes, file, line) | |
171 | size_t bytes; | |
172 | char *file; | |
173 | int line; | |
174 | { | |
175 | PTR_T temp; | |
176 | ||
0001803f CR |
177 | #if defined (DEBUG) |
178 | if (bytes == 0) | |
179 | internal_warning("xmalloc: %s:%d: size argument is 0", file, line); | |
180 | #endif | |
181 | ||
182 | FINDBRK(); | |
f73dda09 JA |
183 | temp = sh_malloc (bytes, file, line); |
184 | ||
185 | if (temp == 0) | |
0001803f | 186 | sh_allocerr ("xmalloc", bytes, file, line); |
f73dda09 JA |
187 | |
188 | return (temp); | |
189 | } | |
190 | ||
191 | PTR_T | |
192 | sh_xrealloc (pointer, bytes, file, line) | |
193 | PTR_T pointer; | |
194 | size_t bytes; | |
195 | char *file; | |
196 | int line; | |
197 | { | |
198 | PTR_T temp; | |
199 | ||
0001803f CR |
200 | #if defined (DEBUG) |
201 | if (bytes == 0) | |
202 | internal_warning("xrealloc: %s:%d: size argument is 0", file, line); | |
203 | #endif | |
204 | ||
205 | FINDBRK(); | |
f73dda09 JA |
206 | temp = pointer ? sh_realloc (pointer, bytes, file, line) : sh_malloc (bytes, file, line); |
207 | ||
208 | if (temp == 0) | |
0001803f | 209 | sh_allocerr ("xrealloc", bytes, file, line); |
f73dda09 JA |
210 | |
211 | return (temp); | |
212 | } | |
213 | ||
214 | void | |
215 | sh_xfree (string, file, line) | |
216 | PTR_T string; | |
217 | char *file; | |
218 | int line; | |
219 | { | |
220 | if (string) | |
221 | sh_free (string, file, line); | |
222 | } | |
223 | #endif |