90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
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/*
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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 The Regents of the University of California.
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* All rights reserved.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef lint
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static char rcsid[] = "$Header: /user6/ouster/tcl/RCS/tclMtherr.c,v 1.7 93/10/31 16:19:31 ouster Exp $ SPRITE (Berkeley)";
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#endif /* not lint */
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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 "tclUnix.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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*----------------------------------------------------------------------
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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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