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2002-02-02  Paul Eggert  <eggert@twinsun.com>

	* src/mktime.c [defined DEBUG && STDC_HEADERS]: Include <string.h>.
	(__mktime_internal): If no tm_isdst is requested, prefer solutions
	with tm_isdst > 0 when the requested time falls within a
	spring-forward gap [PR libc/2894].
This commit is contained in:
Ulrich Drepper 2002-02-03 01:05:29 +00:00
parent 352b06fdbf
commit b5ef404e08
2 changed files with 21 additions and 6 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2002-02-02 Paul Eggert <eggert@twinsun.com>
* src/mktime.c [defined DEBUG && STDC_HEADERS]: Include <string.h>.
(__mktime_internal): If no tm_isdst is requested, prefer solutions
with tm_isdst > 0 when the requested time falls within a
spring-forward gap [PR libc/2894].
2002-02-03 Andreas Schwab <schwab@suse.de>
* stdio-common/tst-rndseek.c: Increase timeout.

20
time/mktime.c
View File

@ -49,6 +49,7 @@
# include <stdio.h>
# if STDC_HEADERS
# include <stdlib.h>
# include <string.h>
# endif
/* Make it work even if the system's libc has its own mktime routine. */
# define mktime my_mktime
@ -236,6 +237,9 @@ __mktime_internal (struct tm *tp,
int year_requested = tp->tm_year;
int isdst = tp->tm_isdst;
/* 1 if the previous probe was DST. */
int dst2;
/* Ensure that mon is in range, and set year accordingly. */
int mon_remainder = mon % 12;
int negative_mon_remainder = mon_remainder < 0;
@ -270,20 +274,24 @@ __mktime_internal (struct tm *tp,
tm.tm_yday = tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
t0 = ydhms_tm_diff (year, yday, hour, min, sec, &tm);
for (t = t1 = t2 = t0 + *offset;
for (t = t1 = t2 = t0 + *offset, dst2 = 0;
(dt = ydhms_tm_diff (year, yday, hour, min, sec,
ranged_convert (convert, &t, &tm)));
t1 = t2, t2 = t, t += dt)
t1 = t2, t2 = t, t += dt, dst2 = tm.tm_isdst != 0)
if (t == t1 && t != t2
&& (isdst < 0 || tm.tm_isdst < 0
|| (isdst != 0) != (tm.tm_isdst != 0)))
&& (tm.tm_isdst < 0
|| (isdst < 0
? dst2 <= (tm.tm_isdst != 0)
: (isdst != 0) != (tm.tm_isdst != 0))))
/* We can't possibly find a match, as we are oscillating
between two values. The requested time probably falls
within a spring-forward gap of size DT. Follow the common
practice in this case, which is to return a time that is DT
away from the requested time, preferring a time whose
tm_isdst differs from the requested value. In practice,
this is more useful than returning -1. */
tm_isdst differs from the requested value. (If no tm_isdst
was requested and only one of the two values has a nonzero
tm_isdst, prefer that value.) In practice, this is more
useful than returning -1. */
break;
else if (--remaining_probes == 0)
return -1;