Error Handling(3m17n)

NAME
m17nError - Error Handling: Error handling of the m17n library.

  Enumerations
enum MErrorCode { MERROR_NONE, MERROR_OBJECT, MERROR_SYMBOL, MERROR_MTEXT, MERROR_TEXTPROP, MERROR_CHAR, MERROR_CHARTABLE, MERROR_CHARSET, MERROR_CODING, MERROR_RANGE, MERROR_LANGUAGE, MERROR_LOCALE, MERROR_PLIST, MERROR_MISC, MERROR_WIN, MERROR_X, MERROR_FRAME, MERROR_FACE, MERROR_DRAW, MERROR_FLT, MERROR_FONT, MERROR_FONTSET, MERROR_FONT_OTF, MERROR_FONT_X, MERROR_FONT_FT, MERROR_IM, MERROR_DB, MERROR_IO, MERROR_DEBUG, MERROR_MEMORY, MERROR_GD, MERROR_MAX }
Enumeration for error code of the m17n library.

  Variables
int merror_code
External variable to hold error code of the m17n library.
void(* m17n_memory_full_handler )(enum MErrorCode err)
Memory allocation error handler.

Detailed Description

Error handling of the m17n library.

There are two types of errors that may happen in a function of the m17n library.

The first type is argument errors. When a library function is called with invalid arguments, it returns a value that indicates error and at the same time sets the external variable merror_code to a non-zero integer.

The second type is memory allocation errors. When the required amount of memory is not available on the system, m17n library functions call a function pointed to by the external variable m17n_memory_full_handler. The default value of the variable is a pointer to the default_error_handle() function, which just calls exit().

Enumeration Type Documentation

  enum MErrorCode

Enumeration for error code of the m17n library.

Enumeration for error code of the m17n library.

When a library function is called with an invalid argument, it sets the external variable merror_code to one of these values. All the error codes are positive integers.

When a memory allocation error happens, the function pointed to by the external variable m17n_memory_full_handler is called with one of these values as an argument.

Variable Documentation

  void(* m17n_memory_full_handler)(enum MErrorCode err)

Memory allocation error handler.

The external variable m17n_memory_full_handler holds a pointer to the function to call when a library function failed to allocate memory. err is one of enum MErrorCode indicating in which function the error occurred.

This variable initially points a function that simply calls the exit () function with err as an argument.

An application program that needs a different error handling can change this variable to point a proper function.

  int merror_code

External variable to hold error code of the m17n library.

The external variable merror_code holds an error code of the m17n library. When a library function is called with an invalid argument, it sets this variable to one of enum MErrorCode.

This variable initially has the value 0.

COPYRIGHT
Copyright (C) 2001 Information-technology Promotion Agency (IPA)
Copyright (C) 2001-2008 National Institute of Advanced Industrial Science and Technology (AIST)
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License <http://www.gnu.org/licenses/fdl.html>.