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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/libhttpd/urlunesc.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <bin.h>
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#include <httpd.h>
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/* go from url with escaped utf to utf */
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char *
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hurlunesc(HConnect *cc, char *s)
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{
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	char *t, *v, *u;
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	Rune r;
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	int c, n;
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	/* unescape */
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	u = halloc(cc, strlen(s)+1);
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	for(t = u; c = *s; s++){
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		if(c == '%'){
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			n = s[1];
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			if(n >= '0' && n <= '9')
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				n = n - '0';
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			else if(n >= 'A' && n <= 'F')
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				n = n - 'A' + 10;
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			else if(n >= 'a' && n <= 'f')
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				n = n - 'a' + 10;
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			else
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				break;
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			r = n;
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			n = s[2];
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			if(n >= '0' && n <= '9')
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				n = n - '0';
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			else if(n >= 'A' && n <= 'F')
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				n = n - 'A' + 10;
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			else if(n >= 'a' && n <= 'f')
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				n = n - 'a' + 10;
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			else
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				break;
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			s += 2;
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			c = (r<<4)+n;
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		}
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		*t++ = c;
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	}
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	*t = '\0';
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	/* convert to valid utf */
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	v = halloc(cc, UTFmax*strlen(u) + 1);
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	s = u;
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	t = v;
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	while(*s){
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		/* in decoding error, assume latin1 */
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		if((n=chartorune(&r, s)) == 1 && r == Runeerror)
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			r = (uchar)*s;
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		s += n;
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		t += runetochar(t, &r);
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	}
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	*t = '\0';
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	return v;
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}