Implement If-Modified-Since

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/libtipidee/tipidee_response_header_lastmodified.c b/src/libtipidee/tipidee_response_header_lastmodified.c
new file mode 100644
index 0000000..3b3caa6
--- /dev/null
+++ b/src/libtipidee/tipidee_response_header_lastmodified.c
@@ -0,0 +1,24 @@
+/* ISC license. */
+
+#include <skalibs/bsdsnowflake.h>
+
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+
+#include <tipidee/response.h>
+
+size_t tipidee_response_header_lastmodified (char *s, size_t max, struct stat const *st)
+{
+  tain t ;
+  size_t l ;
+  if (max < 17) return (errno = ENOBUFS, 0) ;
+  if (!tain_from_timespec(&t, &st->st_mtim)) return 0 ;
+  memcpy(s, "Last-Modified: ", 15) ;
+  l = tipidee_response_header_date_fmt(s + 15, max - 15, &t) ;
+  if (!l) return 0 ;
+  if (l + 17 > max) return (errno = ENOBUFS, 0) ;
+  l += 15 ;
+  s[l++] = '\r' ; s[l++] = '\n' ;
+  return l ;
+}