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EXAMPLES
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IDRAW
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ERRHANDL.C
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C/C++ Source or Header
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1992-01-17
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3KB
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107 lines
/*
* Copyright (c) 1987, 1988, 1989 Stanford University
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Stanford not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Stanford makes no representations about
* the suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* STANFORD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
* IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
// $Header: errhandler.c,v 1.10 89/10/09 14:47:59 linton Exp $
// implements class ErrHandler.
#include "editor.h"
#include "errhandler.h"
#include <stdio.h>
#include <stdlib.h>
// Declare imported functions.
extern NewHandler* set_new_handler(NewHandler*);
ErrHandler* ErrHandler::_err_handler;
// out_of_memory relays the out of memory exception to the current
// instance of ErrHandler.
void out_of_memory () {
ErrHandler::_err_handler->OutOfMemory();
}
// ErrHandler doesn't have an Editor yet.
ErrHandler::ErrHandler () {
editor = nil;
olderr = nil;
oldnew = nil;
}
// ~ErrHandler restores the previous handlers for out of memory exceptions.
ErrHandler::~ErrHandler () {
SetErrHandler(olderr);
set_new_handler(oldnew);
}
// SetEditor sets the Editor which ErrHandler calls upon.
void ErrHandler::SetEditor (Editor* e) {
editor = e;
}
// Install installs this instance of ErrHandler as the handler for
// both X protocol request errors and out of memory exceptions.
ReqErr* ErrHandler::Install () {
olderr = SetErrHandler(this);
oldnew = set_new_handler(&out_of_memory);
return ReqErr::Install();
}
// Error prints the X error, checkpoints the current drawing, and
// terminates the program's execution.
void ErrHandler::Error () {
fprintf(stderr, "X Error: %s\n", message);
fprintf(stderr, " Request code: %d\n", request);
fprintf(stderr, " Request function: %d\n", detail);
fprintf(stderr, " Request window 0x%x\n", id);
fprintf(stderr, " Error Serial #%d\n", msgid);
if (editor != nil) {
// editor->Checkpoint();
}
const int ERROR = 1;
exit(ERROR);
}
// SetErrHandler updates the static variable read by out_of_memory
ErrHandler* ErrHandler::SetErrHandler (ErrHandler* n) {
ErrHandler* o = _err_handler;
_err_handler = n;
return o;
}
// OutOfMemory aborts the program. I wish it could checkpoint the
// drawing, but writing the drawing consumes a significant amount of
// memory.
void ErrHandler::OutOfMemory () {
fprintf(stderr, "operator new failed: out of memory\n");
abort();
}