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
|
#define _POSIX_C_SOURCE 200809L
#include "yasl/yasl.h"
#include <string.h>
#include <strings.h>
#include <unistd.h>
/* decode_path() result for a line that is not a local file URI. */
#define NOT_LOCAL SIZE_MAX
static int hex_digit(char c)
{
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
return -1;
}
static bool local_host(const char *host, size_t len)
{
if (len == 9 && strncasecmp(host, "localhost", 9) == 0) return true;
char name[256];
if (gethostname(name, sizeof(name)) != 0) return false;
name[sizeof(name) - 1] = '\0';
return strlen(name) == len && strncasecmp(host, name, len) == 0;
}
/* Decode the path of one uri-list line. Writes to out only when out is not
* NULL; the caller checks the length first. */
static size_t decode_path(const char *line, size_t len, char *out)
{
const char *p = line, *end = line + len;
if (len < 5 || strncasecmp(p, "file:", 5) != 0) return NOT_LOCAL;
p += 5;
if (end - p >= 2 && p[0] == '/' && p[1] == '/') {
const char *host = p + 2;
p = host;
while (p < end && *p != '/') p++;
if (p > host && !local_host(host, (size_t)(p - host))) return NOT_LOCAL;
}
if (p == end || *p != '/') return NOT_LOCAL;
size_t n = 0;
while (p < end && *p != '?' && *p != '#') {
char c = *p++;
if (c == '%') {
if (end - p < 2) return NOT_LOCAL;
int hi = hex_digit(p[0]), lo = hex_digit(p[1]);
if (hi < 0 || lo < 0 || (hi == 0 && lo == 0)) return NOT_LOCAL;
c = (char)(hi << 4 | lo);
p += 2;
}
if (out) out[n] = c;
n++;
}
return n;
}
size_t yasl_drop_next_path(const char **cursor, char *out, size_t cap)
{
if (!cursor || !*cursor || (!out && cap)) return 0;
const char *p = *cursor;
while (*p) {
const char *line = p;
while (*p && *p != '\r' && *p != '\n') p++;
size_t len = (size_t)(p - line);
while (*p == '\r' || *p == '\n') p++;
while (len && (line[len - 1] == ' ' || line[len - 1] == '\t')) len--;
if (!len || line[0] == '#') continue;
size_t n = decode_path(line, len, NULL);
if (n == NOT_LOCAL) continue;
if (n >= cap) return n;
decode_path(line, len, out);
out[n] = '\0';
*cursor = p;
return n;
}
*cursor = p;
return 0;
}
|
