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--- src/util.c 2014-03-27 20:00:17.000000000 -0300
+++ src/util.c 2014-03-27 20:00:58.000000000 -0300
@@ -18,6 +18,7 @@
* Version $Id: util.c,v 1.1.1.1 2003/01/30 21:30:19 ernstl Exp $
*/
+#include <stdio.h>
#include "util.h"
#include <string.h>
#include <math.h>
@@ -30,14 +31,38 @@
gint
floorm (gint a, gint b)
/* return largest multiple of b that is <= a */
+ /*
+ & & m = floorm(a,b)
+ & a = b*m + r
+ & 0 <= r < b
+ */
{
+#ifdef RLXTEST
+ printf("floorm: a/b %d, fl %g\n", a/b, floor ((gdouble) a / b));
+#endif
return (b * floor ((gdouble) a / b));
}
gint
ceilm (gint a, gint b)
/* return least multiple of b that is >= a */
+ /*
+ & m = ceilm(a,b)
+ & a = b*m - r;
+ & m = a/b
+ % r = a%b
+ & -a = -b*m + r
+
+ & ceilm = (r == 0 ? b*m : (b+1)*m)
+ */
{
+#ifdef RLXTEST
+ printf("ceil: a %d, b %d, -(-a/b) %d,a/b+(a%b != 0 ? 1:0) %d, fl %g\n",
+ a,b,
+ -((-a)/b),
+ a/b+(a%b != 0 ? 1:0),
+ ceil ((gdouble) a / b) );
+#endif
return (b * ceil ((gdouble) a / b));
}