3 * $Id: exc.c,v 1.3 1999/05/06 19:51:35 mdw Exp $
5 * Structured exception handling in C
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
14 * mLib is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * mLib is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.3 1999/05/06 19:51:35 mdw
34 * Reformatted the LGPL notice a little bit.
36 * Revision 1.2 1999/05/05 18:50:31 mdw
37 * Change licensing conditions to LGPL.
39 * Revision 1.1.1.1 1998/06/17 23:44:42 mdw
40 * Initial version of mLib
50 /*----- Global variables --------------------------------------------------*/
52 __exc_hnd *__exc_list = 0;
54 /*----- Functions ---------------------------------------------------------*/
56 /* --- @exc__duff@ --- *
58 * Arguments: @exc_extype type@ = type of duff exception
59 * @exc_exval val@ = extra data supplied
63 * Use: Default handler when everything goes wrong.
66 static void exc__duff(exc_extype type, exc_exval val)
68 fprintf(stderr, "fatal error: uncaught exception (type = %lu)\n", type);
72 /* --- @exc__duffproc@ --- *
74 * Current handler when there are no more exceptions left.
77 static exc__uncaught exc__duffproc = exc__duff;
79 /* --- @exc_uncaught@ --- *
81 * Arguments: @void (*proc)(exc_extype type, exc_exval val) = new handler
83 * Returns: Pointer to the old handler value.
85 * Use: Sets the handler for uncaught exceptions.
88 exc__uncaught exc_uncaught(exc__uncaught proc)
90 exc__uncaught p = exc__duffproc;
96 /* --- @__exc_throw@ --- *
98 * Arguments: @exc_extype type@ = type of exception to throw
102 * Use: NOT FOR USER CONSUMPTION. Reads an appropriate exception
103 * value and throws an exception.
106 void __exc_throw(exc_extype type, ...)
112 switch (type & 0xC0) {
117 v.i = va_arg(ap, int);
120 v.p = va_arg(ap, void *);
123 v.s = va_arg(ap, char *);
127 __exc_rethrow(type, v);
130 /* --- @__exc_rethrow@ --- *
132 * Arguments: @exc_extype type@ = type of exception to throw
133 * @exc_exval val@ = value of exception to throw
137 * Use: NOT FOR USER CONSUMPTION. Does the donkey-work of raising
141 void __exc_rethrow(exc_extype type, exc_exval val)
143 __exc_hnd *p = __exc_list;
145 exc__duffproc(type, val);
148 __exc_list = p->next;
149 longjmp(p->buf, type);
152 /*----- That's all, folks -------------------------------------------------*/