aboutsummaryrefslogtreecommitdiff
path: root/src/urlenc.c
blob: 8d957899c2f2c1f319ca808725d834ce09c6142e (plain)
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
#include "urlenc.h"

#include "tools.h"
#include <ctype.h>
#include <string.h>


/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Local Shortcuts
 */
/* Call only if 0 <= num && num <= 15. */
static char to_hex(int num)
{
    static const char *const hex = "0123456789ABCDEF";
    return hex[num];
}

static int is_url(char c)
{
    return isalnum(c) || strchr("$-_.+ !*'(),", c);
}


/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * URL Encoding
 */
int magi_urlenc_size(const char *plain)
{
    int size;
    if (!plain) {
        return 0;
    }
    for (size = 0; *plain; ++plain, ++size) {
        if (!is_url(*plain)) {
            size += 2;
        }
    }
    return size;
}

void magi_urlenc(const char *plain, char *code)
{
    if (!plain || !code) {
        return;
    }
    while (*plain) {
        if (is_url(*plain)) {
            *(code++) = *plain;
        } else {
            *(code++) = '%';
            *(code++) = to_hex(*plain & 0x0F);
            *(code++) = to_hex(*plain >> 4);
        }
        ++plain;
    }
}