Implement If-Modified-Since

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

1 files changed, 22 insertions, 0 deletions

diff --git a/src/libtipidee/tipidee_util_httpdate.c b/src/libtipidee/tipidee_util_httpdate.c
new file mode 100644
index 0000000..cce735d
--- /dev/null
+++ b/src/libtipidee/tipidee_util_httpdate.c
@@ -0,0 +1,22 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <time.h>
+
+#include <skalibs/djbtime.h>
+
+#include <tipidee/util.h>
+
+int tipidee_util_httpdate (char const *s, tain *stamp)
+{
+  struct tm tm ;
+  if (strptime(s, "%a, %d %b %Y %T GMT", &tm)) goto got ;
+  if (strptime(s, "%a, %d-%b-%y %T GMT", &tm)) goto got ;
+  if (strptime(s, "%a %b %d %T %Y", &tm)) goto got ;
+  return (errno = EINVAL, 0) ;
+
+ got:
+  if (!tai_from_localtm(tain_secp(stamp), &tm)) return 0 ;
+  stamp->nano = 0 ;
+  return 1 ;
+}