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
|
#include "util.h"
void*
checkp(void *p)
{
if (!p) die("pointer assertion failed, OOM?\n");
return p;
}
void*
die(const char *fmtstr, ...)
{
va_list ap;
va_start(ap, fmtstr);
vfprintf(stderr, fmtstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
char*
aprintf(const char *fmtstr, ...)
{
va_list ap, cpy;
size_t nb;
char *str;
va_copy(cpy, ap);
va_start(cpy, fmtstr);
nb = vsnprintf(NULL, 0, fmtstr, ap);
va_end(cpy);
if (nb <= 0) die("encountered invalid fmtstr!\n");
str = checkp(malloc(nb));
va_start(ap, fmtstr);
nb = vsnprintf(str, nb, fmtstr, ap);
va_end(ap);
return str;
}
const char*
mhash(const char *filename, int len)
{
static const char *hexalph = "0123456789ABCDEF";
static char buf[33];
int i, k;
if (len == -1) len = strlen(filename);
for (i = 0; i < MIN(32, len); i++) {
unsigned char v = 0;
for (k = i; k < len; k += 32)
v ^= filename[k];
buf[i*2+0] = hexalph[(v >> 0) & 0x0f];
buf[i*2+1] = hexalph[(v >> 4) & 0x0f];
}
if (i == 0) {
memset(buf, '0', 32);
} else if (i < 32) {
for (k = 0; k < 32; k++)
buf[k] = buf[k % i];
}
buf[32] = '\0';
return buf;
}
|
