3 * $Id: exc.c,v 1.1 1998/06/17 23:44:42 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 General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (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 General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with mLib; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.1 1998/06/17 23:44:42 mdw
43 /*----- Global variables --------------------------------------------------*/
45 __exc_hnd *__exc_list = 0;
47 /*----- Functions ---------------------------------------------------------*/
49 /* --- @exc__duff@ --- *
51 * Arguments: @exc_extype type@ = type of duff exception
52 * @exc_exval val@ = extra data supplied
56 * Use: Default handler when everything goes wrong.
59 static void exc__duff(exc_extype type, exc_exval val)
61 fprintf(stderr, "fatal error: uncaught exception (type = %lu)\n", type);
65 /* --- @exc__duffproc@ --- *
67 * Current handler when there are no more exceptions left.
70 static exc__uncaught exc__duffproc = exc__duff;
72 /* --- @exc_uncaught@ --- *
74 * Arguments: @void (*proc)(exc_extype type, exc_exval val) = new handler
76 * Returns: Pointer to the old handler value.
78 * Use: Sets the handler for uncaught exceptions.
81 exc__uncaught exc_uncaught(exc__uncaught proc)
83 exc__uncaught p = exc__duffproc;
89 /* --- @__exc_throw@ --- *
91 * Arguments: @exc_extype type@ = type of exception to throw
95 * Use: NOT FOR USER CONSUMPTION. Reads an appropriate exception
96 * value and throws an exception.
99 void __exc_throw(exc_extype type, ...)
105 switch (type & 0xC0) {
110 v.i = va_arg(ap, int);
113 v.p = va_arg(ap, void *);
116 v.s = va_arg(ap, char *);
120 __exc_rethrow(type, v);
123 /* --- @__exc_rethrow@ --- *
125 * Arguments: @exc_extype type@ = type of exception to throw
126 * @exc_exval val@ = value of exception to throw
130 * Use: NOT FOR USER CONSUMPTION. Does the donkey-work of raising
134 void __exc_rethrow(exc_extype type, exc_exval val)
136 __exc_hnd *p = __exc_list;
138 exc__duffproc(type, val);
141 __exc_list = p->next;
142 longjmp(p->buf, type);
145 /*----- That's all, folks -------------------------------------------------*/