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* time.c (year_leap_p): new function.

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(timegm_noleapsecond): ditto.
  (search_time_t): use timegm_noleapsecond instead of
  mktime for first guess.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6057 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2004-03-31 10:27:58 +00:00
parent b4a2460981
commit 9bf44e389e
2 changed files with 95 additions and 8 deletions
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9
ChangeLog
View file

@ -1,3 +1,10 @@
Wed Mar 31 19:06:23 2004 Tanaka Akira <akr@m17n.org>
* time.c (year_leap_p): new function.
(timegm_noleapsecond): ditto.
(search_time_t): use timegm_noleapsecond instead of
mktime for first guess.
Wed Mar 31 12:05:17 2004 Nobuyoshi Nakada <nobu@ruby-lang.org>
* lib/delegate.rb (DelegateClass): define internal methods of the
@ -18,7 +25,7 @@ Wed Mar 31 11:17:16 2004 Yukihiro Matsumoto <matz@ruby-lang.org>
Tue Mar 30 20:25:34 2004 Tanaka Akira <akr@m17n.org>
* time.c (search_time_t): limit guess range by mktime if it is
available.
available. [ruby-dev:23274]
Tue Mar 30 18:19:00 2004 Nobuyoshi Nakada <nobu@ruby-lang.org>

94
time.c
View file

@ -402,6 +402,71 @@ static VALUE time_gmtime _((VALUE));
static VALUE time_localtime _((VALUE));
static VALUE time_get_tm _((VALUE, int));
static int
leap_year_p(y)
long y;
{
return ((y % 4 == 0) && (y % 100 != 0)) || (y % 400 == 0);
}
#define DIV(n,d) ((n)<0 ? NDIV((n),(d)) : (n)/(d))
static time_t
timegm_noleapsecond(tm)
struct tm *tm;
{
static int common_year_yday_offset[] = {
-1,
-1 + 31,
-1 + 31 + 28,
-1 + 31 + 28 + 31,
-1 + 31 + 28 + 31 + 30,
-1 + 31 + 28 + 31 + 30 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
-1 + 31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30
/* 1 2 3 4 5 6 7 8 9 10 11 */
};
static int leap_year_yday_offset[] = {
-1,
-1 + 31,
-1 + 31 + 29,
-1 + 31 + 29 + 31,
-1 + 31 + 29 + 31 + 30,
-1 + 31 + 29 + 31 + 30 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
-1 + 31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30
/* 1 2 3 4 5 6 7 8 9 10 11 */
};
long tm_year = tm->tm_year;
int tm_yday = tm->tm_mday;
if (leap_year_p(tm_year + 1900))
tm_yday += leap_year_yday_offset[tm->tm_mon];
else
tm_yday += common_year_yday_offset[tm->tm_mon];
/*
* `Seconds Since the Epoch' in SUSv3:
* tm_sec + tm_min*60 + tm_hour*3600 + tm_yday*86400 +
* (tm_year-70)*31536000 + ((tm_year-69)/4)*86400 -
* ((tm_year-1)/100)*86400 + ((tm_year+299)/400)*86400
*/
return tm->tm_sec + tm->tm_min*60 + tm->tm_hour*3600 +
(time_t)(tm_yday +
(tm_year-70)*365 +
DIV(tm_year-69,4) -
DIV(tm_year-1,100) +
DIV(tm_year+299,400))*86400;
}
static int
tmcmp(a, b)
struct tm *a;
@ -444,14 +509,29 @@ search_time_t(tptr, utc_p)
(1UL << (8 * sizeof(time_t) - 1)) - 1 :
~(time_t)0;
#if defined(HAVE_MKTIME)
if ((guess = mktime(tptr)) != -1) {
if (guess_lo < guess - 24 * 60 * 60)
guess_lo = guess - 24 * 60 * 60;
if (guess + 24 * 60 * 60 < guess_hi)
guess_hi = guess + 24 * 60 * 60;
guess = timegm_noleapsecond(tptr);
tm = (utc_p ? gmtime : localtime)(&guess);
if (tm) {
d = tmcmp(tptr, tm);
if (d == 0) return guess;
if (d < 0) {
guess_hi = guess;
guess -= 24 * 60 * 60;
}
else {
guess_lo = guess;
guess += 24 * 60 * 60;
}
if (guess_lo < guess && guess < guess_hi &&
(tm = (utc_p ? gmtime : localtime)(&guess)) != NULL) {
d = tmcmp(tptr, tm);
if (d == 0) return guess;
if (d < 0)
guess_hi = guess;
else
guess_lo = guess;
}
}
#endif
tm = (utc_p ? gmtime : localtime)(&guess_lo);
if (!tm) goto error;