1 #include <u.h>
2 #include <libc.h>
3 #include <bin.h>
4 #include <httpd.h>
5
6 /* go from url with escaped utf to utf */
7 char *
hurlunesc(HConnect * cc,char * s)8 hurlunesc(HConnect *cc, char *s)
9 {
10 char *t, *v, *u;
11 Rune r;
12 int c, n;
13
14 /* unescape */
15 u = halloc(cc, strlen(s)+1);
16 for(t = u; c = *s; s++){
17 if(c == '%'){
18 n = s[1];
19 if(n >= '0' && n <= '9')
20 n = n - '0';
21 else if(n >= 'A' && n <= 'F')
22 n = n - 'A' + 10;
23 else if(n >= 'a' && n <= 'f')
24 n = n - 'a' + 10;
25 else
26 break;
27 r = n;
28 n = s[2];
29 if(n >= '0' && n <= '9')
30 n = n - '0';
31 else if(n >= 'A' && n <= 'F')
32 n = n - 'A' + 10;
33 else if(n >= 'a' && n <= 'f')
34 n = n - 'a' + 10;
35 else
36 break;
37 s += 2;
38 c = (r<<4)+n;
39 }
40 *t++ = c;
41 }
42 *t = '\0';
43
44 /* convert to valid utf */
45 v = halloc(cc, UTFmax*strlen(u) + 1);
46 s = u;
47 t = v;
48 while(*s){
49 /* in decoding error, assume latin1 */
50 if((n=chartorune(&r, s)) == 1 && r == Runeerror)
51 r = (uchar)*s;
52 s += n;
53 t += runetochar(t, &r);
54 }
55 *t = '\0';
56
57 return v;
58 }
59