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Support TZ transition times < 00:00:00.

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This is needed for version-3 tz-format files; it supports time
stamps past 2037 for America/Godthab (the only entry in the tz
database for which this change is relevant).
* manual/time.texi (TZ Variable): Document transition times
from -167:59:59 through -00:00:01.
* time/tzset.c (tz_rule): Time of day is now signed.
(__tzset_parse_tz): Parse negative time of day.
This commit is contained in:
Paul Eggert
2013-09-18 13:15:12 -07:00
parent 4480e934cc
commit 0748546f66
4 changed files with 29 additions and 3 deletions
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7
time/tzset.c
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@ -54,7 +54,7 @@ typedef struct
/* When to change. */
enum { J0, J1, M } type; /* Interpretation of: */
unsigned short int m, n, d; /* Month, week, day. */
unsigned int secs; /* Time of day. */
int secs; /* Time of day. */
long int offset; /* Seconds east of GMT (west if < 0). */
@ -362,9 +362,12 @@ __tzset_parse_tz (tz)
else if (*tz == '/')
{
/* Get the time of day of the change. */
int negative;
++tz;
if (*tz == '\0')
goto out;
negative = *tz == '-';
tz += negative;
consumed = 0;
switch (sscanf (tz, "%hu%n:%hu%n:%hu%n",
&hh, &consumed, &mm, &consumed, &ss, &consumed))
@ -379,7 +382,7 @@ __tzset_parse_tz (tz)
break;
}
tz += consumed;
tzr->secs = (hh * 60 * 60) + (mm * 60) + ss;
tzr->secs = (negative ? -1 : 1) * ((hh * 60 * 60) + (mm * 60) + ss);
}
else
/* Default to 2:00 AM. */