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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* gensky.c - program to generate sky functions. |
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* Our zenith is along the Z-axis, the X-axis |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <math.h> |
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#include <ctype.h> |
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#include "sun.h" |
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#include "color.h" |
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extern char *strcpy(), *strcat(), *malloc(); |
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extern double stadj(), sdec(), sazi(), salt(); |
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#ifndef PI |
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#define PI 3.14159265358979323846 |
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#endif |
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#define PI 3.141592654 |
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#define DOT(v1,v2) (v1[0]*v2[0]+v1[1]*v2[1]+v1[2]*v2[2]) |
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#define S_CLEAR 1 |
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#define S_UNIF 3 |
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#define S_INTER 4 |
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#define overcast (skytype==S_OVER|skytype==S_UNIF) |
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#define overcast ((skytype==S_OVER)|(skytype==S_UNIF)) |
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double normsc(); |
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/* sun calculation constants */ |
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extern double s_latitude; |
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extern double s_longitude; |
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extern double s_meridian; |
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#undef toupper |
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#define toupper(c) ((c) & ~0x20) /* ASCII trick to convert case */ |
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|
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/* European and North American zones */ |
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struct { |
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char zname[8]; /* time zone name (all caps) */ |
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float zmer; /* standard meridian */ |
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} tzone[] = { |
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{"YST", 135}, {"YDT", 120}, |
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{"PST", 120}, {"PDT", 105}, |
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{"MST", 105}, {"MDT", 90}, |
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{"CST", 90}, {"CDT", 75}, |
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{"EST", 75}, {"EDT", 60}, |
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{"AST", 60}, {"ADT", 45}, |
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{"NST", 52.5}, {"NDT", 37.5}, |
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{"GMT", 0}, {"BST", -15}, |
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{"CET", -15}, {"CEST", -30}, |
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{"EET", -30}, {"EEST", -45}, |
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{"AST", -45}, {"ADT", -60}, |
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{"GST", -60}, {"GDT", -75}, |
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{"IST", -82.5}, {"IDT", -97.5}, |
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{"JST", -135}, {"NDT", -150}, |
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{"NZST", -180}, {"NZDT", -195}, |
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{"", 0} |
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}; |
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/* required values */ |
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int month, day; /* date */ |
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double hour; /* time */ |
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int dosun = 1; |
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double zenithbr = 0.0; |
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int u_zenith = 0; /* -1=irradiance, 1=radiance */ |
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double turbidity = 2.75; |
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double turbidity = 2.45; |
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double gprefl = 0.2; |
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/* computed values */ |
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double sundir[3]; |
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char *progname; |
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char errmsg[128]; |
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void computesky(void); |
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void printsky(void); |
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void printdefaults(void); |
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void userror(char *msg); |
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double normsc(void); |
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int cvthour(char *hs); |
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void printhead(int ac, char **av); |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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int |
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main( |
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int argc, |
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char *argv[] |
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) |
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{ |
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int got_meridian = 0; |
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int i; |
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progname = argv[0]; |
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day = atoi(argv[2]); |
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if (day < 1 || day > 31) |
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userror("bad day"); |
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hour = atof(argv[3]); |
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if (hour < 0 || hour >= 24) |
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userror("bad hour"); |
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tsolar = argv[3][0] == '+'; |
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got_meridian = cvthour(argv[3]); |
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} |
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for (i = 4; i < argc; i++) |
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if (argv[i][0] == '-' || argv[i][0] == '+') |
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s_longitude = atof(argv[++i]) * (PI/180); |
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break; |
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case 'm': |
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if (got_meridian) { |
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++i; |
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break; /* time overrides */ |
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} |
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s_meridian = atof(argv[++i]) * (PI/180); |
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break; |
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default: |
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else |
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userror("bad option"); |
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if (fabs(s_meridian-s_longitude) > 30*PI/180) |
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if (month && !tsolar && fabs(s_meridian-s_longitude) > 45*PI/180) |
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fprintf(stderr, |
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"%s: warning: %.1f hours btwn. standard meridian and longitude\n", |
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"%s: warning - %.1f hours btwn. standard meridian and longitude\n", |
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progname, (s_longitude-s_meridian)*12/PI); |
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printhead(argc, argv); |
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computesky(); |
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printsky(); |
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exit(0); |
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} |
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computesky() /* compute sky parameters */ |
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void |
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computesky(void) /* compute sky parameters */ |
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{ |
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double normfactor; |
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/* compute solar direction */ |
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st = hour + stadj(jd); |
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altitude = salt(sd, st); |
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azimuth = sazi(sd, st); |
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printf("# Local solar time: %.2f\n", st); |
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printf("# Solar altitude and azimuth: %.1f %.1f\n", |
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180./PI*altitude, 180./PI*azimuth); |
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} |
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} |
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printsky() /* print out sky */ |
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void |
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printsky(void) /* print out sky */ |
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{ |
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if (dosun) { |
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printf("\nvoid light solar\n"); |
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} |
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printdefaults() /* print default values */ |
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void |
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printdefaults(void) /* print default values */ |
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{ |
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switch (skytype) { |
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case S_OVER: |
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} |
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userror(msg) /* print usage error and quit */ |
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char *msg; |
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void |
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userror( /* print usage error and quit */ |
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char *msg |
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) |
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{ |
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if (msg != NULL) |
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fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
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double |
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normsc() /* compute normalization factor (E0*F2/L0) */ |
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normsc(void) /* compute normalization factor (E0*F2/L0) */ |
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{ |
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static double nfc[2][5] = { |
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/* clear sky approx. */ |
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/* intermediate sky approx. */ |
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{3.5556, -2.7152, -1.3081, 1.0660, 0.60227}, |
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}; |
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register double *nf; |
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double *nf; |
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double x, nsc; |
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register int i; |
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int i; |
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/* polynomial approximation */ |
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nf = nfc[skytype==S_INTER]; |
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x = (altitude - PI/4.0)/(PI/4.0); |
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} |
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printhead(ac, av) /* print command header */ |
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register int ac; |
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register char **av; |
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int |
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cvthour( /* convert hour string */ |
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char *hs |
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) |
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{ |
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char *cp = hs; |
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int i, j; |
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if ( (tsolar = *cp == '+') ) cp++; /* solar time? */ |
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while (isdigit(*cp)) cp++; |
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if (*cp == ':') |
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hour = atoi(hs) + atoi(++cp)/60.0; |
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else { |
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hour = atof(hs); |
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if (*cp == '.') cp++; |
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} |
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while (isdigit(*cp)) cp++; |
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if (!*cp) |
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return(0); |
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if (tsolar || !isalpha(*cp)) { |
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fprintf(stderr, "%s: bad time format: %s\n", progname, hs); |
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exit(1); |
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} |
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i = 0; |
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do { |
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for (j = 0; cp[j]; j++) |
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if (toupper(cp[j]) != tzone[i].zname[j]) |
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break; |
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if (!cp[j] && !tzone[i].zname[j]) { |
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s_meridian = tzone[i].zmer * (PI/180); |
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return(1); |
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} |
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} while (tzone[i++].zname[0]); |
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fprintf(stderr, "%s: unknown time zone: %s\n", progname, cp); |
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fprintf(stderr, "Known time zones:\n\t%s", tzone[0].zname); |
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for (i = 1; tzone[i].zname[0]; i++) |
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fprintf(stderr, " %s", tzone[i].zname); |
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putc('\n', stderr); |
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exit(1); |
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} |
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void |
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printhead( /* print command header */ |
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int ac, |
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char **av |
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) |
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{ |
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putchar('#'); |
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while (ac--) { |