mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Steel/h/exception

   1 /*
   2  * Exception
   3  *  Handles odd errors in Steel programs
   4  *
   5  * 1.00 (24 September 1991)
   6  *
   7  * © 1991-1998 Straylight
   8  */
   9
  10 /*----- Licensing note ----------------------------------------------------*
  11  *
  12  * This file is part of Straylight's Steel library.
  13  *
  14  * Steel 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, or (at your option)
  17  * any later version.
  18  *
  19  * Steel 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.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with Steel.  If not, write to the Free Software Foundation,
  26  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 #ifndef __exception_h
  30 #define __exception_h
  31
  32 #ifndef __setjmp_h
  33 #include <setjmp.h>
  34 #endif
  35
  36 #ifndef __dll_h
  37   #include "dll.h"
  38 #endif
  39
  40 typedef struct
  41 {
  42   jmp_buf j;
  43   int sp;
  44 }
  45 exception_handler;
  46
  47 /*
  48  * int exception_registerHandler(exception_handler env)
  49  *
  50  * Use
  51  *  Registers the current point as being a sensible place to go after an
  52  *  exception.  This is implemented as a macro for the simple reason that
  53  *  things tend to go a tad wrong if you define your jmp_bufs in a function
  54  *  and then return.
  55  *
  56  * Parameters
  57  *  exception_handler env == an undefined variable of the type jmp_buf.
  58  */
  59
  60 #ifndef exception_registerHandler
  61 #define exception_registerHandler(exc)                                     \
  62   (                                                                        \
  63     ( exc.sp=_dll_setjmp() ),                                              \
  64     ( exception__registerHandler((exc.j),setjmp(exc.j)) ?                  \
  65       (_dll_longjmped(exc.sp),1) :                                         \
  66       0)                                                                  \
  67   )
  68 #endif
  69
  70
  71 /*
  72  * void exception_generate(char *message,...)
  73  *
  74  * Use
  75  *  Generates an ArmenLib exception, to be handled in an appropriate manner.
  76  *
  77  * Parameters
  78  *  char *message == printf()-type format string
  79  */
  80
  81 void exception_generate(char *message,...);
  82
  83
  84 /*
  85  * int exception__registerHandler(jmp_buf handler)
  86  *
  87  * Use
  88  *  This routine is for the use of exception segment only, and should not
  89  *  be called from your code.
  90  */
  91
  92 int exception__registerHandler(jmp_buf handler,int result);
  93
  94 #endif