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
|
/*
20130505
Jan Mojzis
Public domain.
*/
#include "byte.h"
void byte_copy(void *yv, long long ylen, const void *xv) {
long long i;
const char *x = xv;
char *y = yv;
for (i = 0; i < ylen; ++i) y[i] = x[i];
}
void byte_copyr(void *yv, long long ylen, const void *xv) {
long long i;
const char *x = xv;
char *y = yv;
for (i = ylen - 1; i >= 0; --i) y[i] = x[i];
}
long long byte_chr(const void *yv, long long ylen, int c) {
long long i;
const char *y = yv;
char ch = c;
if (ylen <= 0) return ylen;
for (i = 0; i < ylen; ++i) if (y[i] == ch) break;
return i;
}
long long byte_rchr(const void *yv, long long ylen, int c) {
long long i, u = -1;
const char *y = yv;
char ch = c;
if (ylen <= 0) return ylen;
for (i = ylen - 1; i >= 0; --i) if (y[i] == ch) { u = i; break; }
if (u == -1) return ylen;
return u;
}
void byte_zero(void *yv, long long ylen) {
long long i;
char *y = yv;
for (i = 0; i < ylen; ++i) y[i] = 0;
}
int byte_isequal(const void *yv, long long ylen, const void *xv) {
long long i;
const unsigned char *y = yv;
const unsigned char *x = xv;
unsigned char diff = 0;
for (i = 0; i < ylen; ++i) diff |= x[i] ^ y[i];
return (256 - (unsigned int) diff) >> 8;
}
int byte_diff(const void *yv, long long ylen, const void *xv) {
long long i;
const unsigned char *y = yv;
const unsigned char *x = xv;
for (i = 0; i < ylen; ++i) {
if (x[i] == y[i]) continue;
return ((int)(unsigned int)y[i]) - ((int)(unsigned int)x[i]);
}
return 0;
}
|
