[core] http_date_time_append() convenience macro

append IMF-fixdate time string to (buffer *)

src/http_date.h

@@ -22,6 +22,13 @@ uint32_t http_date_time_to_str (char *s, size_t sz, time_t t);
 
 int http_date_if_modified_since (const char *ifmod, uint32_t ifmodlen, time_t lmtime);
 
+/*(convenience macro to append IMF-fixdate to (buffer *))*/
+#define http_date_time_append(b, t)                                           \
+  do {                                                                        \
+    if (!http_date_time_to_str(buffer_extend((b), HTTP_DATE_SZ-1),            \
+                               HTTP_DATE_SZ, (t)))                            \
+        buffer_truncate((b), (b)->used - HTTP_DATE_SZ); /*(truncate if err)*/ \
+  } while (0)
 
 #ifdef __cplusplus
 }

src/mod_expire.c

@@ -282,9 +282,7 @@ mod_expire_set_header (request_st * const r, const time_t * const off)
     else { /* HTTP/1.0 */
         vb = http_header_response_set_ptr(r, HTTP_HEADER_EXPIRES,
                                           CONST_STR_LEN("Expires"));
-        if (!http_date_time_to_str(buffer_extend(vb, HTTP_DATE_SZ-1),
-                                   HTTP_DATE_SZ, expires))
-            buffer_truncate(vb, buffer_clen(vb)+1-HTTP_DATE_SZ);
+        http_date_time_append(vb, expires);
     }
 
     return HANDLER_GO_ON;

src/mod_webdav.c

@@ -3234,9 +3234,7 @@ webdav_propfind_live_props (const webdav_propfind_bufs * const restrict pb,
       case WEBDAV_PROP_GETLASTMODIFIED:
         buffer_append_string_len(b, CONST_STR_LEN(
           "<D:getlastmodified ns0:dt=\"dateTime.rfc1123\">"));
-        if (!http_date_time_to_str(buffer_extend(b, HTTP_DATE_SZ-1),
-                                   HTTP_DATE_SZ, pb->st.st_mtime))
-            buffer_truncate(b, buffer_clen(b)+1-HTTP_DATE_SZ);
+        http_date_time_append(b, pb->st.st_mtime);
         buffer_append_string_len(b, CONST_STR_LEN(
           "</D:getlastmodified>"));
         if (pnum != WEBDAV_PROP_ALL) return 0;/* found *//*(else fall through)*/