minix/lib/ack/libm2/dvi.c

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/*
(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
See the copyright notice in the ACK home directory, in the file "Copyright".
*/
/*
Module: implementation of DIV and MOD
Author: Ceriel J.H. Jacobs
Version: $Header$
Reason: We cannot use DVI and RMI, because DVI rounds towards 0
and Modula-2 requires truncation
*/
#include <em_abs.h>
int
dvi(j,i)
int j,i;
{
if (j == 0) TRP(EIDIVZ);
if ((i < 0) != (j < 0)) {
if (i < 0) i = -i;
else j = -j;
return -((i+j-1)/j);
}
else return i/j;
}
long
dvil(j,i)
long j,i;
{
if (j == 0) TRP(EIDIVZ);
if ((i < 0) != (j < 0)) {
if (i < 0) i = -i;
else j = -j;
return -((i+j-1)/j);
}
else return i/j;
}
int
rmi(j,i)
int j,i;
{
if (j == 0) TRP(EIDIVZ);
if (i == 0) return 0;
if ((i < 0) != (j < 0)) {
if (i < 0) i = -i;
else j = -j;
return j*((i+j-1)/j)-i;
}
else return i%j;
}
long
rmil(j,i)
long j,i;
{
if (j == 0) TRP(EIDIVZ);
if (i == 0) return 0L;
if ((i < 0) != (j < 0)) {
if (i < 0) i = -i;
else j = -j;
return j*((i+j-1)/j)-i;
}
else return i%j;
}