1/* gmp_errno, __gmp_exception -- exception handling and reporting.
2
3   THE FUNCTIONS IN THIS FILE, APART FROM gmp_errno, ARE FOR INTERNAL USE
4   ONLY.  THEY'RE ALMOST CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR
5   DISAPPEAR COMPLETELY IN FUTURE GNU MP RELEASES.
6
7Copyright 2000, 2001, 2003 Free Software Foundation, Inc.
8
9This file is part of the GNU MP Library.
10
11The GNU MP Library is free software; you can redistribute it and/or modify
12it under the terms of the GNU Lesser General Public License as published by
13the Free Software Foundation; either version 3 of the License, or (at your
14option) any later version.
15
16The GNU MP Library is distributed in the hope that it will be useful, but
17WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
18or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
19License for more details.
20
21You should have received a copy of the GNU Lesser General Public License
22along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
23
24#include <stdlib.h>
25#include "gmp.h"
26#include "gmp-impl.h"
27
28int gmp_errno = 0;
29
30
31/* The deliberate divide by zero triggers an exception on most systems.  On
32   those where it doesn't, for example power and powerpc, use abort instead.
33
34   Enhancement: Perhaps raise(SIGFPE) (or the same with kill()) would be
35   better than abort.  Perhaps it'd be possible to get the BSD style
36   FPE_INTDIV_TRAP parameter in there too.  */
37
38void
39__gmp_exception (int error_bit)
40{
41  gmp_errno |= error_bit;
42  __gmp_junk = 10 / __gmp_0;
43  abort ();
44}
45
46
47/* These functions minimize the amount of code required in functions raising
48   exceptions.  Since they're "noreturn" and don't take any parameters, a
49   test and call might even come out as a simple conditional jump.  */
50void
51__gmp_sqrt_of_negative (void)
52{
53  __gmp_exception (GMP_ERROR_SQRT_OF_NEGATIVE);
54}
55void
56__gmp_divide_by_zero (void)
57{
58  __gmp_exception (GMP_ERROR_DIVISION_BY_ZERO);
59}
60