ui-shared: add cgit_print_error_page() function
This will allow us to generate error responses with the correct HTTP
response code without needing all of the layout boilerplate.
Signed-off-by: John Keeping <john@keeping.me.uk>
diff --git a/ui-shared.h b/ui-shared.h
index d8a3551..652685e 100644
--- a/ui-shared.h
+++ b/ui-shared.h
@@ -64,6 +64,8 @@
extern void cgit_redirect(const char *url, bool permanent);
extern void cgit_print_docstart(void);
extern void cgit_print_docend();
+__attribute__((format (printf,3,4)))
+extern void cgit_print_error_page(int code, const char *msg, const char *fmt, ...);
extern void cgit_print_pageheader(void);
extern void cgit_print_filemode(unsigned short mode);
extern void cgit_print_snapshot_links(const char *repo, const char *head,