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>

2 files changed, 16 insertions, 0 deletions

diff --git a/ui-shared.c b/ui-shared.c
index 36fcb21..06dd0a8 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -788,6 +788,20 @@ void cgit_print_docend(void)
         html("</body>\n</html>\n");
 }
 
+void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)
+{
+        va_list ap;
+        ctx.page.status = code;
+        ctx.page.statusmsg = msg;
+        cgit_print_http_headers();
+        cgit_print_docstart();
+        cgit_print_pageheader();
+        va_start(ap, fmt);
+        cgit_vprint_error(fmt, ap);
+        va_end(ap);
+        cgit_print_docend();
+}
+
 static void add_clone_urls(void (*fn)(const char *), char *txt, char *suffix)
 {
         struct strbuf **url_list = strbuf_split_str(txt, ' ', 0);
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_print_http_headers(void);
 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,