blob: 6833e5fa9d61038ecccef5e51c9637a71e2e2b71 (
plain) (
blame)
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
|
/* See LICENSE file for copyright and license details. */
#include "internals"
#include <stdlib.h>
#include <string.h>
void
zbset(z_t a, z_t b, size_t bit, int action)
{
zahl_char_t x = 1;
size_t chars;
chars = FLOOR_BITS_TO_CHARS(bit);
bit = BITS_IN_LAST_CHAR(bit);
x <<= bit;
if (a != b)
zset(a, b);
if (action) {
if (zzero(a)) {
a->used = 0;
SET_SIGNUM(a, 1);
}
if (a->used <= chars) {
if (a->alloced <= chars) {
a->alloced = chars + 1;
a->chars = realloc(a->chars, a->alloced * sizeof(*(a->chars)));
}
memset(a->chars + a->used, 0, (chars - a->used + 1) * sizeof(*(a->chars)));
}
}
if (action > 0) {
a->chars[chars] |= x;
return;
} else if (action < 0) {
a->chars[chars] ^= x;
} else if (a->used > chars) {
a->chars[chars] &= ~x;
}
while (a->used && !a->chars[a->used - 1])
a->used--;
if (!a->used)
SET_SIGNUM(a, 0);
}
|
