/**********************************************************************

 * File:        errcode.cpp  (Formerly error.c)

 * Description: Generic error handler function

 * Author:      Ray Smith

 *

 * (C) Copyright 1989, Hewlett-Packard Ltd.

 ** Licensed under the Apache License, Version 2.0 (the "License");

 ** you may not use this file except in compliance with the License.

 ** You may obtain a copy of the License at

 ** http://www.apache.org/licenses/LICENSE-2.0

 ** Unless required by applicable law or agreed to in writing, software

 ** distributed under the License is distributed on an "AS IS" BASIS,

 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 ** See the License for the specific language governing permissions and

 ** limitations under the License.

 *

 **********************************************************************/

#include "errcode.h"

#include <cstdarg>

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include <iostream> // for std::cerr

#include <sstream>  // for std::stringstream

namespace tesseract {

constexpr ERRCODE BADERRACTION("Illegal error action");

#define MAX_MSG 1024

/**********************************************************************

 * error

 *

 * Print an error message and continue, exit or abort according to action.

 * Makes use of error messages and numbers in a common place.

 *

 **********************************************************************/

void ERRCODE::error(         // handle error

    const char *caller,      // name of caller

    TessErrorLogCode action, // action to take

    const char *format, ...  // special message

    ) const {

  va_list args; // variable args

  std::stringstream msg;

  if (caller != nullptr) {

    // name of caller

    msg << caller << ':';

  }

  // actual message

  msg << "Error:" << message;

  if (format != nullptr) {

    char str[MAX_MSG];

    va_start(args, format); // variable list

    // print remainder

    std::vsnprintf(str, sizeof(str), format, args);

    // ensure termination

    str[sizeof(str) - 1] = '\0';

    va_end(args);

    msg << ':' << str;

  }

  std::cerr << msg.str() << '\n';

  switch (action) {

    case DBG:

    case TESSLOG:

      return; // report only

    case TESSEXIT:

    case ABORT:

#if !defined(NDEBUG)

      // Create a deliberate abnormal exit as the stack trace is more useful

      // that way. This is done only in debug builds, because the

      // error message "segmentation fault" confuses most normal users.

#  if defined(__GNUC__)

      __builtin_trap();

#  else

      *reinterpret_cast<int *>(0) = 0;

#  endif

#endif

      abort();

    default:

      BADERRACTION.error("error", ABORT);

  }

}

} // namespace tesseract