html.c: add html_url_path

This function can be used to generate properly escaped path-components
for links.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

html.c

@@ -128,6 +128,22 @@ void html_attr(char *txt)
 		html(txt);
 }
 
+void html_url_path(char *txt)
+{
+	char *t = txt;
+	while(t && *t){
+		int c = *t;
+		if (c=='"' || c=='#' || c=='\'' || c=='?') {
+			write(htmlfd, txt, t - txt);
+			write(htmlfd, fmt("%%%2x", c), 3);
+			txt = t+1;
+		}
+		t++;
+	}
+	if (t!=txt)
+		html(txt);
+}
+
 void html_url_arg(char *txt)
 {
 	char *t = txt;

html.h

@@ -10,6 +10,7 @@ extern void html_status(int code, const char *msg, int more_headers);
 extern void html_txt(char *txt);
 extern void html_ntxt(int len, char *txt);
 extern void html_attr(char *txt);
+extern void html_url_path(char *txt);
 extern void html_url_arg(char *txt);
 extern void html_hidden(char *name, char *value);
 extern void html_option(char *value, char *text, char *selected_value);