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https://github.com/tesseract-ocr/tesseract.git
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f734888453
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@160 d0cd1f9f-072b-0410-8dd7-cf729c803f20
145 lines
5.0 KiB
C++
145 lines
5.0 KiB
C++
/******************************************************************************
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** Filename: danerror.c
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** Purpose: Routines for managing error trapping
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** Author: Dan Johnson
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** History: 3/17/89, DSJ, Created.
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**
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** (c) Copyright Hewlett-Packard Company, 1988.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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******************************************************************************/
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/**----------------------------------------------------------------------------
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Include Files and Type Defines
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----------------------------------------------------------------------------**/
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#include "general.h"
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#include "danerror.h"
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#include "callcpp.h"
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#include "globaloc.h"
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#ifdef __UNIX__
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#include "assert.h"
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#endif
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#include <stdio.h>
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#include <setjmp.h>
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#define MAXTRAPDEPTH 100
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#define ERRORTRAPDEPTH 1000
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/**----------------------------------------------------------------------------
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Global Data Definitions and Declarations
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----------------------------------------------------------------------------**/
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static jmp_buf ErrorTrapStack[MAXTRAPDEPTH];
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static VOID_PROC ProcTrapStack[MAXTRAPDEPTH];
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static inT32 CurrentTrapDepth = 0;
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/**----------------------------------------------------------------------------
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Public Code
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----------------------------------------------------------------------------**/
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/*---------------------------------------------------------------------------*/
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void ReleaseErrorTrap() {
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/*
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** Parameters:
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** None
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** Globals:
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** CurrentTrapDepth number of traps on the stack
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** Operation:
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** This routine removes the current error trap from the
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** error trap stack, thus returning control to the previous
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** error trap. If the error trap stack is empty, nothing is
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** done.
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** Return:
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** None
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** Exceptions:
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** None
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** History:
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** 4/3/89, DSJ, Created.
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*/
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if (CurrentTrapDepth > 0) {
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CurrentTrapDepth--;
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}
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} /* ReleaseErrorTrap */
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/*---------------------------------------------------------------------------*/
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void DoError(int Error, const char *Message) {
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/*
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** Parameters:
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** Error error number which is to be trapped
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** Message pointer to a string to be printed as an error message
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** Globals:
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** ErrorTrapStack stack of error traps
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** CurrentTrapDepth number of traps on the stack
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** Operation:
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** This routine prints the specified error message to stderr.
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** It then jumps to the current error trap. If the error trap
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** stack is empty, the calling program is terminated with a
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** fatal error message.
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** Return:
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** None - this routine does not return.
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** Exceptions:
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** Empty error trap stack terminates the calling program.
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** History:
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** 4/3/89, DSJ, Created.
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*/
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if (Message != NULL) {
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cprintf ("\nError: %s!\n", Message);
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}
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if (CurrentTrapDepth <= 0) {
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cprintf ("\nFatal error: No error trap defined!\n");
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/* SPC 20/4/94
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There used to be a call to abort() here. I've changed it to call into the
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C++ error code to generate a meaningful status code
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*/
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signal_termination_handler(Error);
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}
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if (ProcTrapStack[CurrentTrapDepth - 1] != DO_NOTHING)
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(*ProcTrapStack[CurrentTrapDepth - 1]) ();
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longjmp (ErrorTrapStack[CurrentTrapDepth - 1], 1);
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} /* DoError */
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/**----------------------------------------------------------------------------
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Private Code
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----------------------------------------------------------------------------**/
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/*---------------------------------------------------------------------------*/
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jmp_buf &PushErrorTrap(VOID_PROC Procedure) {
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/*
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** Parameters:
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** Procedure trap procedure to execute
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** Globals:
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** ErrorTrapStack stack of error traps
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** CurrentTrapDepth number of traps on the stack
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** Operation:
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** This routine pushes a new error trap onto the top of
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** the error trap stack. This new error trap can then be
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** used in a call to setjmp. This trap is then in effect
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** until ReleaseErrorTrap is called. WARNING: a procedure
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** that calls PushErrorTrap should never exit before calling
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** ReleaseErrorTrap.
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** Return:
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** Pointer to a new error trap buffer
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** Exceptions:
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** Traps an error if the error trap stack is already full
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** History:
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** 3/17/89, DSJ, Created.
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** 9/12/90, DSJ, Added trap procedure parameter.
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*/
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if (CurrentTrapDepth >= MAXTRAPDEPTH)
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DoError (ERRORTRAPDEPTH, "Error trap depth exceeded");
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ProcTrapStack[CurrentTrapDepth] = Procedure;
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return ErrorTrapStack[CurrentTrapDepth++];
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} /* PushErrorTrap */
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