/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #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;}