first commit

1 files changed, 77 insertions, 0 deletions

diff --git a/date.c b/date.c
new file mode 100644
index 0000000..4cab1d2
--- /dev/null
+++ b/date.c
@@ -0,0 +1,77 @@
+#include "date.h"
+#define _BSD_SOURCE
+
+enum month {JAN=1, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC} month;
+
+Date extract_date(char *str) {
+	Date ret;
+	sscanf(str, "%d-%d-%d",
+		   &ret.year,
+		   &ret.month,
+		   &ret.day);
+	return ret;
+}
+
+bool smaller(Date a, Date b) {
+	if (zero(b)) return true;
+	if (zero(a)) return false;
+	return ((a.year < b.year) ||
+			((a.year == b.year) && (a.month < b.month)) ||
+			((a.year == b.year) && (a.month == b.month) && (a.day <= b.day)));
+}
+
+bool eql(Date a, Date b) {
+	return (a.day == b.day) &&
+		(a.month == b.month) &&
+		(a.year == b.year);
+}
+
+bool zero(Date a) {
+	return ((a.year == 0) ||
+			(a.month == 0) ||
+			(a.day == 0));
+}
+
+void print_date(Date date) {
+	printf("%i/%i/%i\n", date.month, date.day, date.year);
+}
+
+char *print_date_to_string(Date date) {
+	char *ret = (char *)calloc(16, 1);
+	sprintf(ret, "%i/%i/%i", date.month, date.day, date.year);
+	return ret;
+}
+
+Date today() {
+	FILE *pipe = popen("date \"+%Y-%m-%d\"", "r");
+	char *td = (char *)malloc(12);
+	td = fgets(td, 12, pipe);
+	Date ret = extract_date(td);
+
+	pclose(pipe);
+	free(td);
+	return ret;
+}
+
+Date nextweek(Date td) {
+	Date nw = { td.day+7, td.month, td.year };
+	if (nw.month == FEB && nw.day > 28) {
+		if (nw.year % 4 == 0 && nw.day > 29) {
+			nw.day -= 29; nw.month++;
+		} else {
+			nw.day -= 28; nw.month++;
+		}
+	} else if (nw.month == JAN || nw.month == MAR || nw.month == MAY || nw.month == JUL ||
+			   nw.month == AUG || nw.month == OCT || nw.month == DEC) {
+		if (nw.day > 31 && nw.month == DEC) {
+			nw.day -= 31; nw.month = 1;
+		} else if (nw.day > 31) {
+			nw.day -= 31; nw.month++;
+		}
+	} else if (nw.month == APR || nw.month == JUN || nw.month == SEP || nw.month == NOV) {
+		if (nw.day > 30) {
+			nw.day -= 30; nw.month++;
+		}
+	}
+	return nw;
+}