038fb6fb55
Reported by me in https://github.com/davidgiven/ack/issues/60 This doesn't change DIV. Right now a DIV b does floor division and a MOD b has the sign of b. This is the same as Lua, Python, Ruby, Tcl; but is different from other Modula-2 implementations.
70 lines
1,015 B
C
70 lines
1,015 B
C
/*
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(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/*
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Module: implementation of DIV and MOD
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Author: Ceriel J.H. Jacobs
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Version: $Id$
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Reason: We cannot use DVI and RMI, because DVI rounds towards 0
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and Modula-2 requires truncation
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*/
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#include <em_abs.h>
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int
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dvi(j,i)
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int j,i;
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{
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if (j == 0) TRP(EIDIVZ);
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if ((i < 0) != (j < 0)) {
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if (i < 0) i = -i;
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else j = -j;
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return -((i+j-1)/j);
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}
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else return i/j;
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}
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long
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dvil(j,i)
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long j,i;
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{
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if (j == 0) TRP(EIDIVZ);
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if ((i < 0) != (j < 0)) {
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if (i < 0) i = -i;
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else j = -j;
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return -((i+j-1)/j);
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}
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else return i/j;
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}
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int
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rmi(j,i)
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int j,i;
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{
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int m;
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if (j == 0) TRP(EIDIVZ);
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if (i == 0) return 0;
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m = i % j;
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if (m != 0 && (i < 0) != (j < 0))
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m += j;
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return m;
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}
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long
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rmil(j,i)
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long j,i;
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{
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long m;
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if (j == 0) TRP(EIDIVZ);
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if (i == 0) return 0L;
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m = i % j;
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if (m != 0 && (i < 0) != (j < 0))
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m += j;
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return m;
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}
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