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