add libhttpd

src/libhttpd/urlunesc.c

@@ -0,0 +1,58 @@
+#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;
+}