introduce "format" date-mode

This feeds the format directly to strftime. Besides being a
little more flexible, the main advantage is that your system
strftime may know more about your locale's preferred format
(e.g., how to spell the days of the week).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/strbuf.h b/strbuf.h
index 01c5c6371b..8c8f8d56f9 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -345,6 +345,11 @@ __attribute__((format (printf,2,0)))
 extern void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap);
 
 /**
+ * Add the time specified by `tm`, as formatted by `strftime`.
+ */
+extern void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm);
+
+/**
  * Read a given size of data from a FILE* pointer to the buffer.
  *
  * NOTE: The buffer is rewound if the read fails. If -1 is returned,