1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/*
Unix SMB/Netbios implementation.
Version 3.0
Samba temporary memory allocation functions
Copyright (C) Andrew Tridgell 2000
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* this is a very simple temporary memory allocator. To use it do the following:
1) when you first want to allocate a pool of meomry use
talloc_init() and save the resulting context pointer somewhere
2) to allocate memory use talloc()
3) when _all_ of the memory allocated using this context is no longer needed
use talloc_destroy()
talloc does not zero the memory. It guarantees memory of a
TALLOC_ALIGN alignment
*/
#include "includes.h"
/* initialissa talloc context. */
TALLOC_CTX *talloc_init(void)
{
TALLOC_CTX *t;
t = (TALLOC_CTX *)malloc(sizeof(*t));
if (!t) return NULL;
t->list = NULL;
t->total_alloc_size = 0;
return t;
}
/* allocate a bit of memory from the specified pool */
void *talloc(TALLOC_CTX *t, size_t size)
{
void *p;
struct talloc_chunk *tc;
if (size == 0) {
/* debugging value used to track down
memory problems. BAD_PTR is defined
in talloc.h */
p = BAD_PTR;
return p;
}
p = malloc(size);
if (!p) return p;
tc = malloc(sizeof(*tc));
if (!tc) {
free(p);
return NULL;
}
tc->ptr = p;
tc->size = size;
tc->next = t->list;
t->list = tc;
t->total_alloc_size += size;
return p;
}
/* a talloc version of realloc */
void *talloc_realloc(TALLOC_CTX *t, void *ptr, size_t size)
{
struct talloc_chunk *tc;
for (tc=t->list; tc; tc=tc->next) {
if (tc->ptr == ptr) {
ptr = realloc(ptr, size);
if (ptr) {
t->total_alloc_size += (size - tc->size);
tc->size = size;
tc->ptr = ptr;
}
return ptr;
}
}
return NULL;
}
/* destroy a whole pool */
void talloc_destroy_pool(TALLOC_CTX *t)
{
struct talloc_chunk *c;
if (!t)
return;
while (t->list) {
c = t->list->next;
if (t->list->ptr) free(t->list->ptr);
free(t->list);
t->list = c;
}
t->list = NULL;
t->total_alloc_size = 0;
}
/* destroy a whole pool including the context */
void talloc_destroy(TALLOC_CTX *t)
{
if (!t)
return;
talloc_destroy_pool(t);
memset(t, 0, sizeof(*t));
free(t);
}
/* return the current total size of the pool. */
size_t talloc_pool_size(TALLOC_CTX *t)
{
return t->total_alloc_size;
}
/* talloc and zero memory. */
void *talloc_zero(TALLOC_CTX *t, size_t size)
{
void *p = talloc(t, size);
if (p)
memset(p, '\0', size);
return p;
}
/* memdup with a talloc. */
void *talloc_memdup(TALLOC_CTX *t, void *p, size_t size)
{
void *newp = talloc(t,size);
if (!newp)
return 0;
memcpy(newp, p, size);
return newp;
}
/* strdup with a talloc */
char *talloc_strdup(TALLOC_CTX *t, char *p)
{
return talloc_memdup(t, p, strlen(p) + 1);
}
|
