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
|
/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
$id$ */
/* System */
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
/* Opentracker */
#include "ot_scan.h"
size_t scan_uint(const char *src, uint64_t *dest, uint64_t max) {
unsigned long long value;
char *end;
if (*src < '0' || *src > '9')
return 0;
errno = 0;
value = strtoull(src, &end, 10);
if (errno == ERANGE || value > (unsigned long long)max)
return 0;
*dest = (uint64_t)value;
return (size_t)(end - src);
}
size_t scan_uint_bencode(const char *src, uint64_t *dest, uint64_t max) {
uint64_t value;
size_t consumed = scan_uint(src, &value, max);
/* bencode writes no leading zeros, so anything longer than a single digit
must not begin with one. */
if (consumed > 1 && *src == '0')
return 0;
if (consumed)
*dest = value;
return consumed;
}
int scan_int(const char *src, size_t len, int64_t *dest) {
int64_t value = 0;
int negate = 0;
if (len && *src == '-')
--len, ++src, negate = 1;
if (!len)
return -1;
while (len--) {
if (*src < '0' || *src > '9')
return -1;
/* A twenty character field of nines does not fit, and silently wrapping
would magically heal a nonsense announce */
if (value > (INT64_MAX - (*src - '0')) / 10)
return -1;
value = 10 * value + (*src++ - '0');
}
*dest = negate ? -value : value;
return 0;
}
|
