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(difftm): Simplify expression.

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This commit is contained in:
Karl Heuer 1994-02-10 20:27:34 +00:00
parent 9106ccf1ff
commit 8e718b4eb6
1 changed files with 15 additions and 16 deletions
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31
src/editfns.c
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@ -611,26 +611,25 @@ and from `file-attributes'.")
/* Yield A - B, measured in seconds. */
static long
difftm(a, b)
difftm (a, b)
struct tm *a, *b;
{
int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
return
(
(
(
/* difference in day of year */
a->tm_yday - b->tm_yday
/* + intervening leap days */
+ ((ay >> 2) - (by >> 2))
- (ay/100 - by/100)
+ ((ay/100 >> 2) - (by/100 >> 2))
/* + difference in years * 365 */
+ (long)(ay-by) * 365
)*24 + (a->tm_hour - b->tm_hour)
)*60 + (a->tm_min - b->tm_min)
)*60 + (a->tm_sec - b->tm_sec);
/* Some compilers can't handle this as a single return statement. */
int days = (
/* difference in day of year */
a->tm_yday - b->tm_yday
/* + intervening leap days */
+ ((ay >> 2) - (by >> 2))
- (ay/100 - by/100)
+ ((ay/100 >> 2) - (by/100 >> 2))
/* + difference in years * 365 */
+ (long)(ay-by) * 365
);
return (60*(60*(24*days + (a->tm_hour - b->tm_hour))
+ (a->tm_min - b->tm_min))
+ (a->tm_sec - b->tm_sec));
}
DEFUN ("current-time-zone", Fcurrent_time_zone, Scurrent_time_zone, 0, 1, 0,