87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/*
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* tclMatherr.c --
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*
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* This function provides a default implementation of the
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* "matherr" function, for SYS-V systems where it's needed.
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*
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* Copyright (c) 1993-1994 The Regents of the University of California.
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* Copyright (c) 1994 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclMtherr.c 1.11 96/02/15 11:58:36
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*/
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#include "tclInt.h"
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#include <math.h>
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#ifndef TCL_GENERIC_ONLY
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#include "tclPort.h"
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#else
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#define NO_ERRNO_H
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#endif
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#ifdef NO_ERRNO_H
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extern int errno; /* Use errno from tclExpr.c. */
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#define EDOM 33
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#define ERANGE 34
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#endif
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/*
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* The following variable is secretly shared with Tcl so we can
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* tell if expression evaluation is in progress. If not, matherr
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* just emulates the default behavior, which includes printing
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* a message.
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*/
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extern int tcl_MathInProgress;
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/*
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* The following definitions allow matherr to compile on systems
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* that don't really support it. The compiled procedure is bogus,
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* but it will never be executed on these systems anyway.
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*/
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#ifndef NEED_MATHERR
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struct exception {
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int type;
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};
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#define DOMAIN 0
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#define SING 0
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#endif
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/*
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*----------------------------------------------------------------------
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*
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* matherr --
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*
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* This procedure is invoked on Sys-V systems when certain
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* errors occur in mathematical functions. Type "man matherr"
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* for more information on how this function works.
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*
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* Results:
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* Returns 1 to indicate that we've handled the error
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* locally.
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*
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* Side effects:
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* Sets errno based on what's in xPtr.
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*
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*----------------------------------------------------------------------
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*/
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int
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matherr(xPtr)
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struct exception *xPtr; /* Describes error that occurred. */
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{
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if (!tcl_MathInProgress) {
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return 0;
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}
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if ((xPtr->type == DOMAIN) || (xPtr->type == SING)) {
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errno = EDOM;
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} else {
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errno = ERANGE;
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}
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return 1;
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}
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