From dddbad728c93280fe54ef86699b6d70e2aab44d1 Mon Sep 17 00:00:00 2001 From: Johannes Schindelin Date: Wed, 26 Apr 2017 21:29:31 +0200 Subject: 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 Signed-off-by: Junio C Hamano --- date.c | 66 +++++++++++++++++++++++++++++++++--------------------------------- 1 file changed, 33 insertions(+), 33 deletions(-) (limited to 'date.c') diff --git a/date.c b/date.c index 5c33dfd8ee..92ab31aa44 100644 --- a/date.c +++ b/date.c @@ -39,7 +39,7 @@ static const char *weekday_names[] = { "Sundays", "Mondays", "Tuesdays", "Wednesdays", "Thursdays", "Fridays", "Saturdays" }; -static time_t gm_time_t(unsigned long time, int tz) +static time_t gm_time_t(timestamp_t time, int tz) { int minutes; @@ -54,7 +54,7 @@ static time_t gm_time_t(unsigned long time, int tz) * thing, which means that tz -0100 is passed in as the integer -100, * even though it means "sixty minutes off" */ -static struct tm *time_to_tm(unsigned long time, int tz) +static struct tm *time_to_tm(timestamp_t time, int tz) { time_t t = gm_time_t(time, tz); return gmtime(&t); @@ -64,7 +64,7 @@ static struct tm *time_to_tm(unsigned long time, int tz) * What value of "tz" was in effect back then at "time" in the * local timezone? */ -static int local_tzoffset(unsigned long time) +static int local_tzoffset(timestamp_t time) { time_t t, t_local; struct tm tm; @@ -88,11 +88,11 @@ static int local_tzoffset(unsigned long time) return offset * eastwest; } -void show_date_relative(unsigned long time, int tz, +void show_date_relative(timestamp_t time, int tz, const struct timeval *now, struct strbuf *timebuf) { - unsigned long diff; + timestamp_t diff; if (now->tv_sec < time) { strbuf_addstr(timebuf, _("in the future")); return; @@ -140,9 +140,9 @@ void show_date_relative(unsigned long time, int tz, } /* Give years and months for 5 years or so */ if (diff < 1825) { - unsigned long totalmonths = (diff * 12 * 2 + 365) / (365 * 2); - unsigned long years = totalmonths / 12; - unsigned long months = totalmonths % 12; + timestamp_t totalmonths = (diff * 12 * 2 + 365) / (365 * 2); + timestamp_t years = totalmonths / 12; + timestamp_t months = totalmonths % 12; if (months) { struct strbuf sb = STRBUF_INIT; strbuf_addf(&sb, Q_("%"PRItime" year", "%"PRItime" years", years), years); @@ -172,7 +172,7 @@ struct date_mode *date_mode_from_type(enum date_mode_type type) return &mode; } -const char *show_date(unsigned long time, int tz, const struct date_mode *mode) +const char *show_date(timestamp_t time, int tz, const struct date_mode *mode) { struct tm *tm; static struct strbuf timebuf = STRBUF_INIT; @@ -425,7 +425,7 @@ static int is_date(int year, int month, int day, struct tm *now_tm, time_t now, return 0; } -static int match_multi_number(unsigned long num, char c, const char *date, +static int match_multi_number(timestamp_t num, char c, const char *date, char *end, struct tm *tm, time_t now) { struct tm now_tm; @@ -508,7 +508,7 @@ static int match_digit(const char *date, struct tm *tm, int *offset, int *tm_gmt { int n; char *end; - unsigned long num; + timestamp_t num; num = parse_timestamp(date, &end, 10); @@ -635,7 +635,7 @@ static int match_tz(const char *date, int *offp) return end - date; } -static void date_string(unsigned long date, int offset, struct strbuf *buf) +static void date_string(timestamp_t date, int offset, struct strbuf *buf) { int sign = '+'; @@ -650,16 +650,16 @@ static void date_string(unsigned long date, int offset, struct strbuf *buf) * Parse a string like "0 +0000" as ancient timestamp near epoch, but * only when it appears not as part of any other string. */ -static int match_object_header_date(const char *date, unsigned long *timestamp, int *offset) +static int match_object_header_date(const char *date, timestamp_t *timestamp, int *offset) { char *end; - unsigned long stamp; + timestamp_t stamp; int ofs; if (*date < '0' || '9' < *date) return -1; stamp = parse_timestamp(date, &end, 10); - if (*end != ' ' || stamp == ULONG_MAX || (end[1] != '+' && end[1] != '-')) + if (*end != ' ' || stamp == TIME_MAX || (end[1] != '+' && end[1] != '-')) return -1; date = end + 2; ofs = strtol(date, &end, 10); @@ -675,11 +675,11 @@ static int match_object_header_date(const char *date, unsigned long *timestamp, /* Gr. strptime is crap for this; it doesn't have a way to require RFC2822 (i.e. English) day/month names, and it doesn't work correctly with %z. */ -int parse_date_basic(const char *date, unsigned long *timestamp, int *offset) +int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset) { struct tm tm; int tm_gmt; - unsigned long dummy_timestamp; + timestamp_t dummy_timestamp; int dummy_offset; if (!timestamp) @@ -747,7 +747,7 @@ int parse_date_basic(const char *date, unsigned long *timestamp, int *offset) return 0; /* success */ } -int parse_expiry_date(const char *date, unsigned long *timestamp) +int parse_expiry_date(const char *date, timestamp_t *timestamp) { int errors = 0; @@ -762,7 +762,7 @@ int parse_expiry_date(const char *date, unsigned long *timestamp) * of the past, and there is nothing from the future * to be kept. */ - *timestamp = ULONG_MAX; + *timestamp = TIME_MAX; else *timestamp = approxidate_careful(date, &errors); @@ -771,7 +771,7 @@ int parse_expiry_date(const char *date, unsigned long *timestamp) int parse_date(const char *date, struct strbuf *result) { - unsigned long timestamp; + timestamp_t timestamp; int offset; if (parse_date_basic(date, ×tamp, &offset)) return -1; @@ -845,7 +845,7 @@ void datestamp(struct strbuf *out) * Relative time update (eg "2 days ago"). If we haven't set the time * yet, we need to set it from current time. */ -static unsigned long update_tm(struct tm *tm, struct tm *now, unsigned long sec) +static time_t update_tm(struct tm *tm, struct tm *now, time_t sec) { time_t n; @@ -1066,7 +1066,7 @@ static const char *approxidate_digit(const char *date, struct tm *tm, int *num, time_t now) { char *end; - unsigned long number = parse_timestamp(date, &end, 10); + timestamp_t number = parse_timestamp(date, &end, 10); switch (*end) { case ':': @@ -1114,9 +1114,9 @@ static void pending_number(struct tm *tm, int *num) } } -static unsigned long approxidate_str(const char *date, - const struct timeval *tv, - int *error_ret) +static timestamp_t approxidate_str(const char *date, + const struct timeval *tv, + int *error_ret) { int number = 0; int touched = 0; @@ -1148,12 +1148,12 @@ static unsigned long approxidate_str(const char *date, pending_number(&tm, &number); if (!touched) *error_ret = 1; - return update_tm(&tm, &now, 0); + return (timestamp_t)update_tm(&tm, &now, 0); } -unsigned long approxidate_relative(const char *date, const struct timeval *tv) +timestamp_t approxidate_relative(const char *date, const struct timeval *tv) { - unsigned long timestamp; + timestamp_t timestamp; int offset; int errors = 0; @@ -1162,10 +1162,10 @@ unsigned long approxidate_relative(const char *date, const struct timeval *tv) return approxidate_str(date, tv, &errors); } -unsigned long approxidate_careful(const char *date, int *error_ret) +timestamp_t approxidate_careful(const char *date, int *error_ret) { struct timeval tv; - unsigned long timestamp; + timestamp_t timestamp; int offset; int dummy = 0; if (!error_ret) @@ -1180,12 +1180,12 @@ unsigned long approxidate_careful(const char *date, int *error_ret) return approxidate_str(date, &tv, error_ret); } -int date_overflows(unsigned long t) +int date_overflows(timestamp_t t) { time_t sys; - /* If we overflowed our unsigned long, that's bad... */ - if (t == ULONG_MAX) + /* If we overflowed our timestamp data type, that's bad... */ + if ((uintmax_t)t >= TIME_MAX) return 1; /* -- cgit v1.2.3