#include <httpd.h>

#include <u.h>
#include <libc.h>
#include <bin.h>
#include <httpd.h>

/* go from url with escaped utf to utf */
char *
hurlunesc(HConnect *cc, char *s)
{
char *t, *v, *u;
Rune r;
int c, n;

/* unescape */
u = halloc(cc, strlen(s)+1);
for(t = u; c = *s; s++){
if(c == '%'){
n = s[1];
if(n >= '0' && n <= '9')
n = n - '0';
else if(n >= 'A' && n <= 'F')
n = n - 'A' + 10;
else if(n >= 'a' && n <= 'f')
n = n - 'a' + 10;
else
break;
r = n;
n = s[2];
if(n >= '0' && n <= '9')
n = n - '0';
else if(n >= 'A' && n <= 'F')
n = n - 'A' + 10;
else if(n >= 'a' && n <= 'f')
n = n - 'a' + 10;
else
break;
s += 2;
c = (r<<4)+n;
}
*t++ = c;
}
*t = '\0';

/* convert to valid utf */
v = halloc(cc, UTFmax*strlen(u) + 1);
s = u;
t = v;
while(*s){
/* in decoding error, assume latin1 */
if((n=chartorune(&r, s)) == 1 && r == Runeerror)
r = (uchar)*s;
s += n;
t += runetochar(t, &r);
}
*t = '\0';

return v;
}