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
|
#include "fmt_defs.h"
#include <stdint.h>
/* ip must be int32_t aligned */
unsigned int fmt_utmp_ip(char *buf, const char ip[16]) /*EXTRACT_INCL*/{
unsigned int temp, k, pos0=0, len0=0, pos1=0, compr=0;
int32_t *u = (void *)ip;
char *s = buf;
if (u[1]==0 && u[2]==0 && u[3]==0) {
if (u[0]) {
for (k=0; k<4; k++) {
s += fmt_ulong(s, (unsigned char)ip[k]);
if (k<3) *s++ = '.';
}
}
} else {
for (k=0; k<16; k+=2) {
if (ip[k]==0 && ip[k+1]==0) {
if (!compr) {
compr=1;
pos1=k;
}
if (k==14) { k=16; goto last; }
} else if (compr) {
last:
if ((temp=k-pos1) > len0) {
len0=temp;
pos0=pos1;
}
compr=0;
}
}
for (k=0; k<16; k+=2) {
if (pos0==k && len0) {
if (k==0) *s++ = ':';
*s++ = ':';
k += len0-2;
continue;
}
temp = ((unsigned long) (unsigned char) ip[k] << 8) +
(unsigned long) (unsigned char) ip[k+1];
s += fmt_xlong(s, temp);
if (k<14) *s++ = ':';
}
}
*s = 0;
return s-buf;
}
|
