Revisión de arvelie.c

1 file changed, 63 insertions

arvelie.c(archivo creado)

		@@ -0,0 +1,63 @@
1	+	/* POSIX arvelie.c
2	+	*
3	+	* a simple program to convert dates to arvelie.
4	+	* read more: https://wiki.xxiivv.com/site/arvelie.html
5	+	*/
6	+
7	+	#include <math.h>
8	+	#include <stdio.h>
9	+	#include <stdlib.h>
10	+	#include <time.h>
11	+	#include <unistd.h>
12	+
13	+	void usage();
14	+	int main(int argc, char* argv[]);
15	+
16	+	void
17	+	usage()
18	+	{
19	+	fprintf(stderr, "usage: arvelie [-d YYYY-MM-DD]\n");
20	+	exit(EXIT_FAILURE);
21	+	}
22	+
23	+	int
24	+	main(int argc, char* argv[])
25	+	{
26	+	time_t t = -1;
27	+	char* inputDate = NULL;
28	+
29	+	int opt;
30	+	while ((opt = getopt(argc, argv, ":d:")) != -1) {
31	+	switch (opt) {
32	+	case 'd':
33	+	inputDate = optarg;
34	+	break;
35	+	case '?':
36	+	usage();
37	+	break;
38	+	case ':':
39	+	usage();
40	+	break;
41	+	default:
42	+	usage();
43	+	}
44	+	}
45	+
46	+	if (inputDate != NULL) {
47	+	struct tm tm = {0};
48	+	strptime(inputDate, "%Y-%m-%d", &tm);
49	+	t = mktime(&tm);
50	+	} else {
51	+	t = time(NULL);
52	+	}
53	+
54	+	struct tm* date = localtime(&t);
55	+
56	+	int yday = date->tm_yday;
57	+	int year = date->tm_year % 100;
58	+	char month = (yday < 364) ? (char)65 + (yday / 14) : '+';
59	+	int day = yday % 14;
60	+
61	+	printf("%02d%c%02d\n", year, month, day);
62	+	exit(EXIT_SUCCESS);
63	+	}

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