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pom: Fix fencepost bugs.

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Under some conditions pom would report "waning" and then "full", show
higher percentages than it should, and get confused by DST.  Fix.

Before:

  2018.01.30: The Moon is Waxing Gibbous (97% of Full)
  2018.01.31: The Moon is Waning Gibbous (100% of Full)
  2018.02.01: The Moon is Full
  2018.02.02: The Moon is Waning Gibbous (98% of Full)

After:

  2018.01.30: The Moon is Waxing Gibbous (96% of Full)
  2018.01.31: The Moon is Waxing Gibbous (99% of Full)
  2018.02.01: The Moon is Full
  2018.02.02: The Moon is Waning Gibbous (97% of Full)

PR:                    231705
Submitted by:          Andrew Gierth
Approved by:           allanjude (mentor)
MFC after:             2 weeks
Differential Revision: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231705
This commit is contained in:
Thomas Munro 2018-11-20 00:06:53 +00:00
parent f5d03775e0
commit d1f84ec0a7
1 changed files with 6 additions and 4 deletions
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10
usr.bin/pom/pom.c
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@ -135,11 +135,13 @@ main(int argc, char **argv)
tmd.tm_hour = 0;
tmd.tm_min = 0;
tmd.tm_sec = 0;
tmd.tm_isdst = -1;
}
if (otime != NULL) {
tmd.tm_hour = strtol(otime, NULL, 10);
tmd.tm_min = strtol(otime + 3, NULL, 10);
tmd.tm_sec = strtol(otime + 6, NULL, 10);
tmd.tm_isdst = -1;
}
tt = mktime(&tmd);
}
@ -149,19 +151,19 @@ main(int argc, char **argv)
(GMT.tm_min / 60.0) + (GMT.tm_sec / 3600.0)) / 24.0);
for (cnt = EPOCH; cnt < GMT.tm_year; ++cnt)
days += isleap(1900 + cnt) ? 366 : 365;
today = potm(days) + .5;
today = potm(days);
if (pflag) {
(void)printf("%1.0f\n", today);
return (0);
}
(void)printf("The Moon is ");
if ((int)today == 100)
if (today >= 99.5)
(void)printf("Full\n");
else if (!(int)today)
else if (today < 0.5)
(void)printf("New\n");
else {
tomorrow = potm(days + 1);
if ((int)today == 50)
if (today >= 49.5 && today < 50.5)
(void)printf("%s\n", tomorrow > today ?
"at the First Quarter" : "at the Last Quarter");
else {