[PATCH 02/11] cal: convert function like definitions to functions

[Sami Kerola <kerolasa@iki.fi>]

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
---
 misc-utils/cal.c | 45 ++++++++++++++++++++++++++++-----------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/misc-utils/cal.c b/misc-utils/cal.c
index 13830de..eacf3dd 100644
--- a/misc-utils/cal.c
+++ b/misc-utils/cal.c
@@ -209,23 +209,6 @@ char j_day_headings[J_WEEK_LEN*6+1];
 /* weekstart = 1  =>   "  M  Tu   W  Th   F   S   S " */
 const char *full_month[12];
 
-/* leap year -- account for gregorian reformation in 1752 */
-#define	leap_year(yr) \
-	((yr) <= 1752 ? !((yr) % 4) : \
-	(!((yr) % 4) && ((yr) % 100)) || !((yr) % 400))
-
-/* number of centuries since 1700, not inclusive */
-#define	centuries_since_1700(yr) \
-	((yr) > 1700 ? (yr) / 100 - 17 : 0)
-
-/* number of centuries since 1700 whose modulo of 400 is 0 */
-#define	quad_centuries_since_1700(yr) \
-	((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
-
-/* number of leap years between year 1 and this year, not inclusive */
-#define	leap_years_since_year_1(yr) \
-	((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
-
 /* 0 => sunday, 1 => monday */
 int weekstart=0;
 int julian;
@@ -239,6 +222,9 @@ struct fmt_st
   char s[FMT_ST_LINES][FMT_ST_CHARS];
 };
 
+int leap_year(int year);
+int centuries_since_1700(int year, int centuries);
+int leap_years_since_year_1(int year);
 char * ascii_day(char *, int);
 int center_str(const char* src, char* dest, size_t dest_size, size_t width);
 void center(const char *, size_t, int);
@@ -413,6 +399,31 @@ main(int argc, char **argv) {
 	return EXIT_SUCCESS;
 }
 
+/* leap year -- account for gregorian reformation in 1752 */
+int leap_year(int year)
+{
+	if (year <= 1752)
+		return !(year % 4);
+	else
+		return !(year % 4 && (year % 100 || year % 400));
+}
+
+/* number of centuries since 1700 */
+int centuries_since_1700(int year, int n)
+{
+	if (year < 1700)
+		return 0;
+	else
+		return ((year / (100 * n)) - (17 / n));
+}
+
+/* number of leap years between year 1 and this year, not inclusive */
+int leap_years_since_year_1(int year)
+{
+	return (year / 4 - centuries_since_1700(year, 1) +
+		centuries_since_1700(year, 4));
+}
+
 void headers_init(void)
 {
 	int i, wd;
-- 
1.8.2.2