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authoredwin <edwin@FreeBSD.org>2010-01-05 21:14:48 +0000
committeredwin <edwin@FreeBSD.org>2010-01-05 21:14:48 +0000
commitc309e354e02589a88594800cef4cd8169f53fa06 (patch)
treed8969dddca82f25837113069477e84feee72eb69 /games/pom
parentfa4a3591591d0365fabb6cf510d007be10d39412 (diff)
downloadFreeBSD-src-c309e354e02589a88594800cef4cd8169f53fa06.zip
FreeBSD-src-c309e354e02589a88594800cef4cd8169f53fa06.tar.gz
Be able to specify a certain date and/or time for which to calculate
the phase of the moon. While not worlds best improvements, it will help calendar(1) later on.
Diffstat (limited to 'games/pom')
-rw-r--r--games/pom/pom.633
-rw-r--r--games/pom/pom.c72
2 files changed, 90 insertions, 15 deletions
diff --git a/games/pom/pom.6 b/games/pom/pom.6
index 1a5325b..e6bc957 100644
--- a/games/pom/pom.6
+++ b/games/pom/pom.6
@@ -32,15 +32,34 @@
.\" @(#)pom.6 8.1 (Berkeley) 5/31/93
.\" $FreeBSD$
.\"
-.TH POM 6 "May 31, 1993"
+.Dd May 31, 1993
+.Dt POM 6
.UC 7
-.SH NAME
-pom \- display the phase of the moon
-.SH SYNOPSIS
-.B pom
-.SH DESCRIPTION
+.Sh NAME
+.Nm pom
+.Nd display the phase of the moon
+.Sh SYNOPSIS
+.Nm
+.Op Fl d Ar yyyy.mm.dd
+.Op Fl t Ar hh:mm:ss
+.Sh DESCRIPTION
The
-.I pom
+.Nm
utility displays the current phase of the moon.
Useful for selecting software completion target dates and predicting
managerial behavior.
+.Pp
+Use the arguments
+.Fl d
+and
+.Fl o
+to specify a specific date and time for which the phase of the moon
+has to be calculated.
+If
+.Fl d
+but not
+.Fl t
+has been specified, it will calculate the phase of the moon on that
+day at midnight.
+.Sh SEE ALSO
+`Practical Astronomy with Your Calculator' by Duffett-Smith.
diff --git a/games/pom/pom.c b/games/pom/pom.c
index d245f34..fd82f68 100644
--- a/games/pom/pom.c
+++ b/games/pom/pom.c
@@ -57,9 +57,13 @@ __FBSDID("$FreeBSD$");
*
*/
-#include <time.h>
#include <stdio.h>
+#include <stdlib.h>
#include <math.h>
+#include <string.h>
+#include <sysexits.h>
+#include <time.h>
+#include <unistd.h>
#ifndef PI
#define PI 3.14159265358979323846
@@ -76,20 +80,62 @@ __FBSDID("$FreeBSD$");
static void adj360(double *);
static double dtor(double);
static double potm(double);
+static void usage(char *progname);
int
-main(void)
+main(int argc, char **argv)
{
time_t tt;
- struct tm *GMT;
+ struct tm GMT, tmd;
double days, today, tomorrow;
int cnt;
+ char *odate = NULL, *otime = NULL, ch;
+
+ while ((ch = getopt(argc, argv, "d:t:")) != -1)
+ switch (ch) {
+ case 'd':
+ odate = optarg;
+ break;
+ case 't':
+ otime = optarg;
+ break;
+ default:
+ usage(argv[0]);
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (argc)
+ usage(argv[0]);
+
+ /* Adjust based on users preferences */
+ time(&tt);
+ if (otime != NULL || odate != NULL) {
+ /* Save today in case -d isn't specified */
+ localtime_r(&tt, &tmd);
+
+ if (odate != NULL) {
+ tmd.tm_year = strtol(odate, NULL, 10) - 1900;
+ tmd.tm_mon = strtol(odate + 5, NULL, 10) - 1;
+ tmd.tm_mday = strtol(odate + 8, NULL, 10);
+ /* Use midnight as the middle of the night */
+ tmd.tm_hour = 0;
+ tmd.tm_min = 0;
+ tmd.tm_sec = 0;
+ }
+ 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);
+ }
+ tt = mktime(&tmd);
+ }
- (void) time(&tt);
- GMT = gmtime(&tt);
- days = (GMT->tm_yday + 1) + ((GMT->tm_hour +
- (GMT->tm_min / 60.0) + (GMT->tm_sec / 3600.0)) / 24.0);
- for (cnt = EPOCH; cnt < GMT->tm_year; ++cnt)
+ gmtime_r(&tt, &GMT);
+ days = (GMT.tm_yday + 1) + ((GMT.tm_hour +
+ (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;
(void)printf("The Moon is ");
@@ -160,6 +206,7 @@ potm(double days)
static double
dtor(double deg)
{
+
return(deg * PI / 180);
}
@@ -170,6 +217,7 @@ dtor(double deg)
static void
adj360(double *deg)
{
+
for (;;)
if (*deg < 0)
*deg += 360;
@@ -178,3 +226,11 @@ adj360(double *deg)
else
break;
}
+
+static void
+usage(char *progname)
+{
+
+ fprintf(stderr, "Usage: %s [-d yyyy.mm.dd] [-t hh:mm:ss]\n", progname);
+ exit(EX_USAGE);
+}
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