minix/lib/ack/libm2/ucheck.c

65 lines
1 KiB
C
Executable file

/*
* (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
* See the copyright notice in the ACK home directory, in the file "Copyright".
*
*
* Module: CARDINAL operations with overflow checking
* Author: Ceriel J.H. Jacobs
* Version: $Header$
*/
#ifndef EM_WSIZE
#define EM_WSIZE _EM_WSIZE
#endif
#ifndef EM_LSIZE
#define EM_LSIZE _EM_LSIZE
#endif
#include <m2_traps.h>
#define MAXCARD ((unsigned)-1)
#if EM_WSIZE < EM_LSIZE
#define MAXLONGCARD ((unsigned long) -1L)
#endif
adduchk(a,b)
unsigned a,b;
{
if (MAXCARD - a < b) TRP(M2_UOVFL);
}
#if EM_WSIZE < EM_LSIZE
addulchk(a,b)
unsigned long a,b;
{
if (MAXLONGCARD - a < b) TRP(M2_UOVFL);
}
#endif
muluchk(a,b)
unsigned a,b;
{
if (a != 0 && MAXCARD/a < b) TRP(M2_UOVFL);
}
#if EM_WSIZE < EM_LSIZE
mululchk(a,b)
unsigned long a,b;
{
if (a != 0 && MAXLONGCARD/a < b) TRP(M2_UOVFL);
}
#endif
subuchk(a,b)
unsigned a,b;
{
if (b < a) TRP(M2_UUVFL);
}
#if EM_WSIZE < EM_LSIZE
subulchk(a,b)
unsigned long a,b;
{
if (b < a) TRP(M2_UUVFL);
}
#endif