From 3c399fa40fd13c5749386695e71f5f747a634f21 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 14 Jun 2017 09:51:20 +0200 Subject: udf: Use time64_to_tm for timestamp conversion UDF on-disk time stamp is stored in a form very similar to struct tm. Use time64_to_tm() for conversion of seconds since epoch to year, month, ... format and then just copy this as necessary to UDF on-disk structure to simplify the code. Signed-off-by: Jan Kara --- fs/udf/udftime.c | 45 +++++++++++---------------------------------- 1 file changed, 11 insertions(+), 34 deletions(-) (limited to 'fs/udf/udftime.c') diff --git a/fs/udf/udftime.c b/fs/udf/udftime.c index 77c331f1a770..b9dadc7e5c35 100644 --- a/fs/udf/udftime.c +++ b/fs/udf/udftime.c @@ -38,6 +38,7 @@ #include #include +#include #define EPOCH_YEAR 1970 @@ -81,9 +82,6 @@ static time_t year_seconds[MAX_YEAR_SECONDS] = { /*2038*/ SPY(68, 17, 0) }; -#define SECS_PER_HOUR (60 * 60) -#define SECS_PER_DAY (SECS_PER_HOUR * 24) - struct timespec * udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src) { @@ -119,9 +117,9 @@ udf_disk_stamp_to_time(struct timespec *dest, struct timestamp src) struct timestamp * udf_time_to_disk_stamp(struct timestamp *dest, struct timespec ts) { - long int days, rem, y; - const unsigned short int *ip; + long seconds; int16_t offset; + struct tm tm; offset = -sys_tz.tz_minuteswest; @@ -130,35 +128,14 @@ udf_time_to_disk_stamp(struct timestamp *dest, struct timespec ts) dest->typeAndTimezone = cpu_to_le16(0x1000 | (offset & 0x0FFF)); - ts.tv_sec += offset * 60; - days = ts.tv_sec / SECS_PER_DAY; - rem = ts.tv_sec % SECS_PER_DAY; - dest->hour = rem / SECS_PER_HOUR; - rem %= SECS_PER_HOUR; - dest->minute = rem / 60; - dest->second = rem % 60; - y = 1970; - -#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0)) -#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400)) - - while (days < 0 || days >= (__isleap(y) ? 366 : 365)) { - long int yg = y + days / 365 - (days % 365 < 0); - - /* Adjust DAYS and Y to match the guessed year. */ - days -= ((yg - y) * 365 - + LEAPS_THRU_END_OF(yg - 1) - - LEAPS_THRU_END_OF(y - 1)); - y = yg; - } - dest->year = cpu_to_le16(y); - ip = __mon_yday[__isleap(y)]; - for (y = 11; days < (long int)ip[y]; --y) - continue; - days -= ip[y]; - dest->month = y + 1; - dest->day = days + 1; - + seconds = ts.tv_sec + offset * 60; + time64_to_tm(seconds, 0, &tm); + dest->year = cpu_to_le16(tm.tm_year + 1900); + dest->month = tm.tm_mon + 1; + dest->day = tm.tm_mday; + dest->hour = tm.tm_hour; + dest->minute = tm.tm_min; + dest->second = tm.tm_sec; dest->centiseconds = ts.tv_nsec / 10000000; dest->hundredsOfMicroseconds = (ts.tv_nsec / 1000 - dest->centiseconds * 10000) / 100; -- cgit v1.2.3-58-ga151