rainlance/amiga-tz
1
0
Fork 0
mirror of https://frontier.innolan.net/rainlance/amiga-tz.git synced 2025-12-08 18:11:43 +00:00
Code Releases Activity

Saudi footnote goes

Browse Source 
SCCS-file: date.c
SCCS-SID: 2.3
This commit is contained in:
Arthur David Olson
1989-03-08 23:20:15 -05:00
committed by Paul Eggert
parent fbbe9efa82
commit 5919bcac28
1 changed files with 62 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

69
date.c
View File

@ -93,6 +93,7 @@ static int retval = EXIT_SUCCESS;
static void ambiguous();
static void display();
static void finalcheck();
static time_t gettime();
int netsettime();
static void oops();
@ -247,6 +248,8 @@ char * argv[];
else oops("date: error: stime");
#endif /* !defined DST_NONE */
finalcheck(t);
display(format);
for ( ; ; )
;
@ -279,27 +282,32 @@ char * string;
}
static void
ambiguous(thist, thatt)
ambiguous(thist, thatt, was_set)
time_t thist;
time_t thatt;
{
struct tm tm;
(void) fprintf(stderr, "date: error: ambiguous time.\n");
(void) fprintf(stderr, "date: error: ambiguous time. ");
tm = *gmtime(&thist);
if (was_set)
(void) fprintf(stderr, "Time was set as if you used\n");
else (void) fprintf(stderr, "Use\n");
/*
** Avoid running afoul of SCCS!
*/
timeout(stderr, "Use\n\tdate -u %Y", &tm);
timeout(stderr, "\tdate -u %Y", &tm);
timeout(stderr, "%m%d%H", &tm);
timeout(stderr, "%M.%S\n", &tm);
tm = *localtime(&thist);
timeout(stderr, "to get %c");
(void) fprintf(stderr, " (%s time)",
tm.tm_isdst ? "summer" : "standard");
(void) fprintf(stderr, ", ");
if (was_set)
(void) fprintf(stderr, ". Use\n");
else (void) fprintf(stderr, ", or\n");
tm = *gmtime(&thatt);
timeout(stderr, "or\n\tdate -u %Y", &tm);
timeout(stderr, "\tdate -u %Y", &tm);
timeout(stderr, "%m%d%H", &tm);
timeout(stderr, "%M.%S\n", &tm);
tm = *localtime(&thatt);
@ -478,6 +486,53 @@ struct tm * tmp;
}
}
/*
** If a jurisdiction shifts time *without* shifting whether time is
** summer or standard (as Hawaii, the United Kingdom, and Saudi Arabia
** have done), routine checks for ambiguous times may not work.
** So we perform this final check, deferring it until after the time has
** been set--it may take a while, and we don't want to introduce an unnecessary
** lag between the time the user enters their command and the time that
** stime/settimeofday is called.
**
** We just check nearby times to see if any of them have the same representation
** as the time that gettime returned. We work our way out from the center
** for quick response in solar time situations. We only handle common cases--
** offsets of at most a minute, and offsets of exact numbers of minutes
** and at most an hour.
*/
static void
finalcheck(t)
time_t t;
{
struct tm tm;
register int pass;
register long offset;
time_t othert;
struct tm othertm;
tm = *localtime(&t);
for (offset = 1; offset <= 60; ++offset)
for (pass = 1; pass <= 4; ++pass) {
if (pass == 1)
othert = t + offset;
else if (pass == 2)
othert = t - offset;
else if (pass == 3)
othert = t + 60 * offset;
else othert = t - 60 * offset;
othertm = *localtime(&othert);
if (tm.tm_year == othertm.tm_year &&
tm.tm_mon == othertm.tm_mon &&
tm.tm_hour == othertm.tm_hour &&
tm.tm_min == othertm.tm_min &&
tm.tm_sec == othertm.tm_sec &&
tm.tm_isdst == othertm.tm_isdst)
ambiguous(t, othert, 1);
}
}
/*
** gettime --
** convert user's input into a time_t.
@ -532,7 +587,7 @@ int isdst;
else return thatt;
else if (thatt == -1)
return thist;
else ambiguous(thist, thatt);
else ambiguous(thist, thatt, 0);
}
tm = *localtime(&now);
tm.tm_isdst = isdst;
@ -610,7 +665,7 @@ int isdst;
else return thatt;
else if (thatt == -1)
return thist;
else ambiguous(thist, thatt);
else ambiguous(thist, thatt, 0);
case 6: /* yyyymmddhhmm--BSD finally wins in the 21st century */
year = pairs[0] * 100 + pairs[1];