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added unix timestamp output to sunrise script

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This commit is contained in:
Steffen Vogel 2012-03-14 12:46:59 +00:00
parent 88e8bf1601
commit 1fe309c53c
1 changed files with 29 additions and 4 deletions
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33
src/sun.c
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@ -1,5 +1,6 @@
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "math.h"
#include "time.h"
@ -8,6 +9,7 @@ double deg2rad(double deg) {
}
enum sun { RISE, SET };
enum out { HUMAN, UNIX };
double sun(enum sun mode, double lat, double lon, int timezone) {
const double h = -0.0145;
@ -35,24 +37,47 @@ double sun(enum sun mode, double lat, double lon, int timezone) {
int main(int argc, char *argv[]) {
enum sun mode;
enum out output;
if (argc < 5) goto usage;
if (argc < 4 || argc > 6) goto usage;
if (strcmp(argv[1], "rise") == 0) mode = RISE;
else if (strcmp(argv[1], "set") == 0) mode = SET;
else goto usage;
int timezone = atoi(argv[4]);
if (argc >= 6) {
if (strcmp(argv[5], "human") == 0) output = HUMAN;
else if (strcmp(argv[5], "unix") == 0) output = UNIX;
else goto usage;
}
else {
output = HUMAN;
}
int timezone = (argc >= 5) ? atoi(argv[4]) : 0;
double lat = deg2rad(strtod(argv[2], NULL));
double lon = deg2rad(strtod(argv[3], NULL));
double time = sun(mode, lat, lon, timezone);
double intpart;
printf("%d:%02d\n", (int) floor(time), (int) (modf(time, &intpart)*60));
switch (output) {
case HUMAN:
printf("%d:%02d\n", (int) floor(time), (int) (modf(time, &intpart)*60));
break;
case UNIX:
printf("%d\n", (int) round(time*60*60));
break;
}
return 0;
usage:
fprintf(stderr, "usage: sun (rise|set) LAT LON TIMEZONE\n");
fprintf(stderr, "usage: sun MODE LAT LON [TIMEZONE] [OUTPUT]\n");
fprintf(stderr, " MODE\t\t'rise' or 'set'\n");
fprintf(stderr, " LAT, LON\tthe geografical postition in degree\n");
fprintf(stderr, " TIMEZONE\tan integer describing the timezone offset\n");
fprintf(stderr, " OUTPUT\t'human' (default) or 'unix'\n");
return -1;
}