html.c: add html_url_arg
This function can be used to properly escape querystring parameter values.
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/html.h b/html.h
index 3c32935..038cf60 100644
--- a/html.h
+++ b/html.h
@@ -10,6 +10,7 @@
extern void html_txt(char *txt);
extern void html_ntxt(int len, char *txt);
extern void html_attr(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);
extern void html_link_open(char *url, char *title, char *class);