1991-03-05 11:56:39 +00:00
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/*
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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: CARDINAL operations with overflow checking
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* Author: Ceriel J.H. Jacobs
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* Version: $Header$
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*/
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#ifndef EM_WSIZE
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#define EM_WSIZE _EM_WSIZE
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#endif
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#ifndef EM_LSIZE
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#define EM_LSIZE _EM_LSIZE
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#endif
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#include <m2_traps.h>
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#define MAXCARD ((unsigned)-1)
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#if EM_WSIZE < EM_LSIZE
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#define MAXLONGCARD ((unsigned long) -1L)
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#endif
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adduchk(a,b)
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unsigned a,b;
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{
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1991-03-06 10:20:17 +00:00
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if (MAXCARD - a < b) TRP(M2_UOVFL);
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1991-03-05 11:56:39 +00:00
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}
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#if EM_WSIZE < EM_LSIZE
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addulchk(a,b)
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unsigned long a,b;
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{
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1991-03-06 10:20:17 +00:00
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if (MAXLONGCARD - a < b) TRP(M2_UOVFL);
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1991-03-05 11:56:39 +00:00
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}
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#endif
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muluchk(a,b)
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unsigned a,b;
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{
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if (a != 0 && MAXCARD/a < b) TRP(M2_UOVFL);
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}
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#if EM_WSIZE < EM_LSIZE
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mululchk(a,b)
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unsigned long a,b;
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{
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if (a != 0 && MAXLONGCARD/a < b) TRP(M2_UOVFL);
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}
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#endif
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subuchk(a,b)
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unsigned a,b;
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{
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if (b < a) TRP(M2_UOVFL);
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}
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#if EM_WSIZE < EM_LSIZE
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subulchk(a,b)
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unsigned long a,b;
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{
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if (b < a) TRP(M2_UOVFL);
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}
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#endif
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