timestamp_t: a new data type for timestamps

Git's source code assumes that unsigned long is at least as precise as
time_t. Which is incorrect, and causes a lot of problems, in particular
where unsigned long is only 32-bit (notably on Windows, even in 64-bit
versions).

So let's just use a more appropriate data type instead. In preparation
for this, we introduce the new `timestamp_t` data type.

By necessity, this is a very, very large patch, as it has to replace all
timestamps' data type in one go.

As we will use a data type that is not necessarily identical to `time_t`,
we need to be very careful to use `time_t` whenever we interact with the
system functions, and `timestamp_t` everywhere else.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/cache.h b/cache.h
index ba27595d54..f3a02993b2 100644
--- a/cache.h
+++ b/cache.h
@@ -1476,18 +1476,18 @@ struct date_mode {
 #define DATE_MODE(t) date_mode_from_type(DATE_##t)
 struct date_mode *date_mode_from_type(enum date_mode_type type);
 
-const char *show_date(unsigned long time, int timezone, const struct date_mode *mode);
-void show_date_relative(unsigned long time, int tz, const struct timeval *now,
+const char *show_date(timestamp_t time, int timezone, const struct date_mode *mode);
+void show_date_relative(timestamp_t time, int tz, const struct timeval *now,
 			struct strbuf *timebuf);
 int parse_date(const char *date, struct strbuf *out);
-int parse_date_basic(const char *date, unsigned long *timestamp, int *offset);
-int parse_expiry_date(const char *date, unsigned long *timestamp);
+int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset);
+int parse_expiry_date(const char *date, timestamp_t *timestamp);
 void datestamp(struct strbuf *out);
 #define approxidate(s) approxidate_careful((s), NULL)
-unsigned long approxidate_careful(const char *, int *);
-unsigned long approxidate_relative(const char *date, const struct timeval *now);
+timestamp_t approxidate_careful(const char *, int *);
+timestamp_t approxidate_relative(const char *date, const struct timeval *now);
 void parse_date_format(const char *format, struct date_mode *mode);
-int date_overflows(unsigned long date);
+int date_overflows(timestamp_t date);
 
 #define IDENT_STRICT	       1
 #define IDENT_NO_DATE	       2