source: Sophya/trunk/SophyaExt/XephemAstroLib/formats.c@ 4017

Last change on this file since 4017 was 4017, checked in by cmv, 14 years ago

fichiers de Xephem 3.7.5 update, cmv 21/09/2011
File size: 5.0 KB
Line 
1#include <stdio.h>
2#include <math.h>
3#include <ctype.h>
4#include <stdlib.h>
5#include <string.h>
6
7#include "astro.h"
8#include "preferences.h"
9
10/* sprint the variable a in sexagesimal format into out[].
11 * w is the number of spaces for the whole part.
12 * fracbase is the number of pieces a whole is to broken into; valid options:
13 * 360000: <w>:mm:ss.ss
14 * 36000: <w>:mm:ss.s
15 * 3600: <w>:mm:ss
16 * 600: <w>:mm.m
17 * 60: <w>:mm
18 * return number of characters written to out, not counting final '\0'.
19 */
20int
21fs_sexa (char *out, double a, int w, int fracbase)
22{
23 char *out0 = out;
24 unsigned long n;
25 int d;
26 int f;
27 int m;
28 int s;
29 int isneg;
30
31 /* save whether it's negative but do all the rest with a positive */
32 isneg = (a < 0);
33 if (isneg)
34 a = -a;
35
36 /* convert to an integral number of whole portions */
37 n = (unsigned long)(a * fracbase + 0.5);
38 d = n/fracbase;
39 f = n%fracbase;
40
41 /* form the whole part; "negative 0" is a special case */
42 if (isneg && d == 0)
43 out += sprintf (out, "%*s-0", w-2, "");
44 else
45 out += sprintf (out, "%*d", w, isneg ? -d : d);
46
47 /* do the rest */
48 switch (fracbase) {
49 case 60: /* dd:mm */
50 m = f/(fracbase/60);
51 out += sprintf (out, ":%02d", m);
52 break;
53 case 600: /* dd:mm.m */
54 out += sprintf (out, ":%02d.%1d", f/10, f%10);
55 break;
56 case 3600: /* dd:mm:ss */
57 m = f/(fracbase/60);
58 s = f%(fracbase/60);
59 out += sprintf (out, ":%02d:%02d", m, s);
60 break;
61 case 36000: /* dd:mm:ss.s*/
62 m = f/(fracbase/60);
63 s = f%(fracbase/60);
64 out += sprintf (out, ":%02d:%02d.%1d", m, s/10, s%10);
65 break;
66 case 360000: /* dd:mm:ss.ss */
67 m = f/(fracbase/60);
68 s = f%(fracbase/60);
69 out += sprintf (out, ":%02d:%02d.%02d", m, s/100, s%100);
70 break;
71 default:
72 printf ("fs_sexa: unknown fracbase: %d\n", fracbase);
73 abort();
74 }
75
76 return (out - out0);
77}
78
79/* put the given modified Julian date, jd, in out[] according to the given
80 * preference format.
81 * return number of characters written to out, not counting final '\0'.
82 */
83int
84fs_date (char out[], int format, double jd)
85{
86 char *out0 = out;
87 int m, y;
88 double d;
89
90 mjd_cal (jd, &m, &d, &y);
91 /* beware of %g rounding day up */
92 if ((d < 1.0 && d - floor(d) >= .9999995)
93 || (d < 10.0 && d - floor(d) >= .999995)
94 || (d >= 10.0 && d - floor(d) >= .99995))
95 mjd_cal (mjd_day(jd+0.5), &m, &d, &y);
96
97 switch (format) {
98 case PREF_YMD:
99 out += sprintf (out, "%4d/%02d/%02.6g", y, m, d);
100 break;
101 case PREF_DMY:
102 out += sprintf (out, "%2.6g/%02d/%-4d", d, m, y);
103 break;
104 case PREF_MDY:
105 out += sprintf (out, "%2d/%02.6g/%-4d", m, d, y);
106 break;
107 default:
108 printf ("fs_date: bad date pref: %d\n", format);
109 abort();
110 }
111
112 return (out - out0);
113}
114
115
116/* convert sexagesimal string str AxBxC to double.
117 * x can be anything non-numeric. Any missing A, B or C will be assumed 0.
118 * optional - and + can be anywhere.
119 * return 0 if ok, -1 if can't find a thing.
120 */
121int
122f_scansexa (
123const char *str0, /* input string */
124double *dp) /* cracked value, if return 0 */
125{
126 double a, b, c;
127 char str[256];
128 char *neg;
129 int isneg, r;
130
131 /* copy str0 so we can play with it */
132 strncpy (str, str0, sizeof(str)-1);
133 str[sizeof(str)-1] = '\0';
134
135 /* note first negative (but not fooled by neg exponent) */
136 isneg = 0;
137 neg = strchr(str, '-');
138 if (neg && (neg == str || (neg[-1] != 'E' && neg[-1] != 'e'))) {
139 *neg = ' ';
140 isneg = 1;
141 }
142
143 /* crack up to three components */
144 a = b = c = 0.0;
145 r = sscanf (str, "%lf%*[^0-9]%lf%*[^0-9]%lf", &a, &b, &c);
146 if (r < 1)
147 return (-1);
148
149 /* back to one value, restoring neg */
150 *dp = (c/60.0 + b)/60.0 + a;
151 if (isneg)
152 *dp *= -1;
153 return (0);
154}
155
156/* crack a floating date string, bp, of the form X/Y/Z determined by the
157 * PREF_DATE_FORMAT preference into its components. allow the day to be a
158 * floating point number,
159 * the slashes may also be spaces or colons.
160 * a lone component with a decimal point is considered a year.
161 */
162void
163f_sscandate (
164char *bp,
165int pref, /* one of PREF_X for PREF_DATE_FORMAT */
166int *m,
167double *d,
168int *y)
169{
170 double X,Y,Z; /* the three components */
171 int n;
172
173 X = Y = Z = 0.0;
174 n = sscanf (bp, "%lf%*[/: ]%lf%*[/: ]%lf", &X, &Y, &Z);
175 if (n == 1 && (strchr(bp, '.')
176 || (pref == PREF_MDY && (X < 1 || X > 12))
177 || (pref == PREF_DMY && (X < 1 || X > 31)))) {
178 double Mjd;
179 year_mjd (X, &Mjd);
180 mjd_cal (Mjd, m, d, y);
181 } else {
182 switch (pref) {
183 case PREF_MDY:
184 if (n > 0 && X != 0)
185 *m = (int)X;
186 if (n > 1 && Y != 0)
187 *d = Y;
188 if (n > 2 && Z != 0)
189 *y = (int)Z;
190 break;
191 case PREF_YMD:
192 if (n > 0 && X != 0)
193 *y = (int)X;
194 if (n > 1 && Y != 0)
195 *m = (int)Y;
196 if (n > 2 && Z != 0)
197 *d = Z;
198 break;
199 case PREF_DMY:
200 if (n > 0 && X != 0)
201 *d = X;
202 if (n > 1 && Y != 0)
203 *m = (int)Y;
204 if (n > 2 && Z != 0)
205 *y = (int)Z;
206 break;
207 }
208 }
209}
210
211/* For RCS Only -- Do Not Edit */
212static char *rcsid[2] = {(char *)rcsid, "@(#) $RCSfile: formats.c,v $ $Date: 2011-09-21 16:17:49 $ $Revision: 1.9 $ $Name: not supported by cvs2svn $"};
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