Index: head/usr.bin/pom/pom.c =================================================================== --- head/usr.bin/pom/pom.c (revision 340654) +++ head/usr.bin/pom/pom.c (revision 340655) @@ -1,253 +1,255 @@ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software posted to USENET. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if 0 #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1989, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static const char sccsid[] = "@(#)pom.c 8.1 (Berkeley) 5/31/93"; #endif /* not lint */ #endif #include __FBSDID("$FreeBSD$"); /* * Phase of the Moon. Calculates the current phase of the moon. * Based on routines from `Practical Astronomy with Your Calculator', * by Duffett-Smith. Comments give the section from the book that * particular piece of code was adapted from. * * -- Keith E. Brandt VIII 1984 * */ #include #include #include #include #include #include #include #include #include #include #include #ifndef PI #define PI 3.14159265358979323846 #endif #define EPOCH 85 #define EPSILONg 279.611371 /* solar ecliptic long at EPOCH */ #define RHOg 282.680403 /* solar ecliptic long of perigee at EPOCH */ #define ECCEN 0.01671542 /* solar orbit eccentricity */ #define lzero 18.251907 /* lunar mean long at EPOCH */ #define Pzero 192.917585 /* lunar mean long of perigee at EPOCH */ #define Nzero 55.204723 /* lunar mean long of node at EPOCH */ #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) static void adj360(double *); static double dtor(double); static double potm(double); static void usage(char *progname); int main(int argc, char **argv) { time_t tt; struct tm GMT, tmd; double days, today, tomorrow; int ch, cnt, pflag = 0; char *odate = NULL, *otime = NULL; char *progname = argv[0]; if (caph_limit_stdio() < 0) err(1, "unable to limit capabitilities for stdio"); caph_cache_catpages(); if (caph_enter() < 0) err(1, "unable to enter capability mode"); while ((ch = getopt(argc, argv, "d:pt:")) != -1) switch (ch) { case 'd': odate = optarg; break; case 'p': pflag = 1; break; case 't': otime = optarg; break; default: usage(progname); } argc -= optind; argv += optind; if (argc) usage(progname); /* 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; + 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); } 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; + 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 { (void)printf("%s ", tomorrow > today ? "Waxing" : "Waning"); if (today > 50) (void)printf("Gibbous (%1.0f%% of Full)\n", today); else if (today < 50) (void)printf("Crescent (%1.0f%% of Full)\n", today); } } return 0; } /* * potm -- * return phase of the moon */ static double potm(double days) { double N, Msol, Ec, LambdaSol, l, Mm, Ev, Ac, A3, Mmprime; double A4, lprime, V, ldprime, D, Nm; N = 360 * days / 365.2422; /* sec 42 #3 */ adj360(&N); Msol = N + EPSILONg - RHOg; /* sec 42 #4 */ adj360(&Msol); Ec = 360 / PI * ECCEN * sin(dtor(Msol)); /* sec 42 #5 */ LambdaSol = N + Ec + EPSILONg; /* sec 42 #6 */ adj360(&LambdaSol); l = 13.1763966 * days + lzero; /* sec 61 #4 */ adj360(&l); Mm = l - (0.1114041 * days) - Pzero; /* sec 61 #5 */ adj360(&Mm); Nm = Nzero - (0.0529539 * days); /* sec 61 #6 */ adj360(&Nm); Ev = 1.2739 * sin(dtor(2*(l - LambdaSol) - Mm)); /* sec 61 #7 */ Ac = 0.1858 * sin(dtor(Msol)); /* sec 61 #8 */ A3 = 0.37 * sin(dtor(Msol)); Mmprime = Mm + Ev - Ac - A3; /* sec 61 #9 */ Ec = 6.2886 * sin(dtor(Mmprime)); /* sec 61 #10 */ A4 = 0.214 * sin(dtor(2 * Mmprime)); /* sec 61 #11 */ lprime = l + Ev + Ec - Ac + A4; /* sec 61 #12 */ V = 0.6583 * sin(dtor(2 * (lprime - LambdaSol))); /* sec 61 #13 */ ldprime = lprime + V; /* sec 61 #14 */ D = ldprime - LambdaSol; /* sec 63 #2 */ return(50 * (1 - cos(dtor(D)))); /* sec 63 #3 */ } /* * dtor -- * convert degrees to radians */ static double dtor(double deg) { return(deg * PI / 180); } /* * adj360 -- * adjust value so 0 <= deg <= 360 */ static void adj360(double *deg) { for (;;) if (*deg < 0) *deg += 360; else if (*deg > 360) *deg -= 360; else break; } static void usage(char *progname) { fprintf(stderr, "Usage: %s [-p] [-d yyyy.mm.dd] [-t hh:mm:ss]\n", progname); exit(EX_USAGE); }