1 files changed, 112 insertions, 0 deletions
diff --git a/common-birthday.c b/common-birthday.c
new file mode 100644
index 0000000..d6088ec
--- /dev/null
+++ b/common-birthday.c
@@ -0,0 +1,112 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+static const int days_in_month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+
+int
+get_age(struct libcontacts_birthday *bday, const struct tm *now)
+{
+	int age = now->tm_year + 1900 - (int)bday->year;
+	if (now->tm_mon + 1 < bday->month)
+		age -= 1;
+	else if (now->tm_mon + 1 == bday->month)
+		age -= (now->tm_mday < bday->day);
+	return age;
+}
+
+void
+print_birthdate(struct libcontacts_birthday *bday, const struct tm *now)
+{
+	int age, days = 0, y, m, d;
+	if (bday->year)
+		printf("%04u-", bday->year);
+	else
+		printf("??""??""-");
+	if (bday->month) {
+		printf("(%02u)%.3s-", (unsigned)bday->month,
+		       &"JanFebMarAprMayJunJulAugSepOctNovDec"[3 * ((bday->month - 1) % 12)]);
+	} else {
+		printf("(??"")??""?-");
+	}
+	if (bday->day)
+		printf("%02u", (unsigned)bday->day);
+	else
+		printf("??");
+	if ((bday->month - 1) % 12 == 1 && bday->day == 29) {
+		bday->day -= bday->before_on_common;
+		printf(" (%s on common years)", bday->before_on_common ? "(02)Feb-28" : "(03)Mar-01");
+	}
+	if (bday->year && bday->month && bday->day) {
+		age = get_age(bday, now);
+		y = (int)bday->year - 1900;
+		m = (int)bday->month - 1;
+		d = (int)bday->day;
+		while (m != now->tm_mon || d > now->tm_mday) {
+			days += days_in_month[m] - (d - 1);
+			days += (m == 1 && y % 4 == 0 && (y % 100 || y % 400 == 0));
+			d = 1;
+			if (++m == 12) {
+				y += 1;
+				m = 0;
+			}
+		}
+		days += now->tm_mday - d;
+		printf(", %i %s and %i %s old", age, age == 1 ? "year" : "years", days, days == 1 ? "day" : "days");
+	}
+	printf("\n");
+}
+
+void
+print_birthday(struct libcontacts_birthday *bday, const struct tm *now)
+{
+	int next_year = 0, leap_year = 0, year, age, days = 0, y, m, d;
+	struct tm when;
+	if (now->tm_mon + 1 > bday->month)
+		next_year = 1;
+	else if (now->tm_mon + 1 == bday->month)
+		next_year = (now->tm_mday > bday->day);
+	if (bday->year) {
+		printf("%04i-", now->tm_year + next_year + 1900);
+	} else {
+		printf("??""??""-");
+	}
+	year = now->tm_year + next_year + 1900;
+	if (year % 4 == 0 && (year % 100 || year % 400 == 0))
+		leap_year = 1;
+	if (((bday->month - 1) % 12 == 1 && bday->day == 29) && leap_year) {
+		if (bday->before_on_common) {
+			bday->day -= 1;
+		} else {
+			bday->day = 1;
+			bday->month += 1;
+		}
+	}
+	printf("(%02u)%.3s-%02u (", (unsigned)bday->month,
+	       &"JanFebMarAprMayJunJulAugSepOctNovDec"[3 * ((bday->month - 1) % 12)], (unsigned)bday->day);
+	when.tm_year = now->tm_year + next_year;
+	when.tm_mon = (bday->month - 1) % 12;
+	when.tm_mday = bday->day;
+	if (bday->year) {
+		age = get_age(bday, &when);
+		printf("%i %s ", age, age == 1 ? "year" : "years");
+	}
+	if (when.tm_mon == now->tm_mon && when.tm_mday == now->tm_mday) {
+		printf("today)\n");
+	} else {
+		y = now->tm_year;
+		m = now->tm_mon;
+		d = now->tm_mday;
+		while (m != when.tm_mon || d > when.tm_mday) {
+			days += days_in_month[m] - (d - 1);
+			days += (m == 1 && y % 4 == 0 && (y % 100 || y % 400 == 0));
+			d = 1;
+			if (++m == 12) {
+				y += 1;
+				m = 0;
+			}
+		}
+		days += when.tm_mday - d;
+		printf("in %i %s)\n", days, days == 1 ? "day" : "days");
+	}
+}