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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b5efdb8a LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
b5efdb8a LP |
6 | ***/ |
7 | ||
11c3a366 TA |
8 | #include <stdint.h> |
9 | #include <string.h> | |
10 | ||
b5efdb8a | 11 | #include "alloc-util.h" |
11c3a366 | 12 | #include "macro.h" |
b5efdb8a LP |
13 | #include "util.h" |
14 | ||
15 | void* memdup(const void *p, size_t l) { | |
c165d97d | 16 | void *ret; |
b5efdb8a | 17 | |
c165d97d LP |
18 | assert(l == 0 || p); |
19 | ||
20 | ret = malloc(l); | |
21 | if (!ret) | |
22 | return NULL; | |
23 | ||
24 | memcpy(ret, p, l); | |
25 | return ret; | |
26 | } | |
27 | ||
d40c54fe | 28 | void* memdup_suffix0(const void *p, size_t l) { |
c165d97d LP |
29 | void *ret; |
30 | ||
31 | assert(l == 0 || p); | |
32 | ||
33 | /* The same as memdup() but place a safety NUL byte after the allocated memory */ | |
b5efdb8a | 34 | |
c165d97d LP |
35 | ret = malloc(l + 1); |
36 | if (!ret) | |
b5efdb8a LP |
37 | return NULL; |
38 | ||
c165d97d LP |
39 | *((uint8_t*) mempcpy(ret, p, l)) = 0; |
40 | return ret; | |
b5efdb8a LP |
41 | } |
42 | ||
43 | void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) { | |
44 | size_t a, newalloc; | |
45 | void *q; | |
46 | ||
47 | assert(p); | |
48 | assert(allocated); | |
49 | ||
50 | if (*allocated >= need) | |
51 | return *p; | |
52 | ||
53 | newalloc = MAX(need * 2, 64u / size); | |
54 | a = newalloc * size; | |
55 | ||
56 | /* check for overflows */ | |
57 | if (a < size * need) | |
58 | return NULL; | |
59 | ||
60 | q = realloc(*p, a); | |
61 | if (!q) | |
62 | return NULL; | |
63 | ||
64 | *p = q; | |
65 | *allocated = newalloc; | |
66 | return q; | |
67 | } | |
68 | ||
69 | void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) { | |
70 | size_t prev; | |
71 | uint8_t *q; | |
72 | ||
73 | assert(p); | |
74 | assert(allocated); | |
75 | ||
76 | prev = *allocated; | |
77 | ||
78 | q = greedy_realloc(p, allocated, need, size); | |
79 | if (!q) | |
80 | return NULL; | |
81 | ||
82 | if (*allocated > prev) | |
83 | memzero(q + prev * size, (*allocated - prev) * size); | |
84 | ||
85 | return q; | |
86 | } |