290 lines
8.7 KiB
C
290 lines
8.7 KiB
C
/****************************************************************************
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*
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* fterrors.h
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*
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* FreeType error code handling (specification).
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*
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* Copyright (C) 1996-2020 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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/**************************************************************************
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*
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* @section:
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* error_enumerations
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*
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* @title:
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* Error Enumerations
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*
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* @abstract:
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* How to handle errors and error strings.
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*
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* @description:
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* The header file `fterrors.h` (which is automatically included by
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* `freetype.h` defines the handling of FreeType's enumeration
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* constants. It can also be used to generate error message strings
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* with a small macro trick explained below.
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*
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* **Error Formats**
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*
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* The configuration macro `FT_CONFIG_OPTION_USE_MODULE_ERRORS` can be
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* defined in `ftoption.h` in order to make the higher byte indicate the
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* module where the error has happened (this is not compatible with
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* standard builds of FreeType~2, however). See the file `ftmoderr.h`
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* for more details.
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*
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* **Error Message Strings**
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*
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* Error definitions are set up with special macros that allow client
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* applications to build a table of error message strings. The strings
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* are not included in a normal build of FreeType~2 to save space (most
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* client applications do not use them).
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*
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* To do so, you have to define the following macros before including
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* this file.
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*
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* ```
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* FT_ERROR_START_LIST
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* ```
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*
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* This macro is called before anything else to define the start of the
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* error list. It is followed by several `FT_ERROR_DEF` calls.
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*
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* ```
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* FT_ERROR_DEF( e, v, s )
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* ```
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*
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* This macro is called to define one single error. 'e' is the error
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* code identifier (e.g., `Invalid_Argument`), 'v' is the error's
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* numerical value, and 's' is the corresponding error string.
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*
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* ```
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* FT_ERROR_END_LIST
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* ```
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*
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* This macro ends the list.
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*
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* Additionally, you have to undefine `FTERRORS_H_` before #including
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* this file.
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*
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* Here is a simple example.
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*
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* ```
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* #undef FTERRORS_H_
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* #define FT_ERRORDEF( e, v, s ) { e, s },
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* #define FT_ERROR_START_LIST {
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* #define FT_ERROR_END_LIST { 0, NULL } };
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*
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* const struct
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* {
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* int err_code;
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* const char* err_msg;
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* } ft_errors[] =
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*
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* #include FT_ERRORS_H
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* ```
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*
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* An alternative to using an array is a switch statement.
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*
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* ```
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* #undef FTERRORS_H_
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* #define FT_ERROR_START_LIST switch ( error_code ) {
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* #define FT_ERRORDEF( e, v, s ) case v: return s;
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* #define FT_ERROR_END_LIST }
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* ```
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*
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* If you use `FT_CONFIG_OPTION_USE_MODULE_ERRORS`, `error_code` should
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* be replaced with `FT_ERROR_BASE(error_code)` in the last example.
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*/
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/* */
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/* In previous FreeType versions we used `__FTERRORS_H__`. However, */
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/* using two successive underscores in a non-system symbol name */
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/* violates the C (and C++) standard, so it was changed to the */
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/* current form. In spite of this, we have to make */
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/* */
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/* ``` */
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/* #undefine __FTERRORS_H__ */
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/* ``` */
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/* */
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/* work for backward compatibility. */
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/* */
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#if !( defined( FTERRORS_H_ ) && defined ( __FTERRORS_H__ ) )
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#define FTERRORS_H_
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#define __FTERRORS_H__
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/* include module base error codes */
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#include FT_MODULE_ERRORS_H
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/*******************************************************************/
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/*******************************************************************/
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/***** *****/
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/***** SETUP MACROS *****/
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/***** *****/
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/*******************************************************************/
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/*******************************************************************/
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#undef FT_NEED_EXTERN_C
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/* FT_ERR_PREFIX is used as a prefix for error identifiers. */
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/* By default, we use `FT_Err_`. */
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/* */
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#ifndef FT_ERR_PREFIX
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#define FT_ERR_PREFIX FT_Err_
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#endif
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/* FT_ERR_BASE is used as the base for module-specific errors. */
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/* */
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#ifdef FT_CONFIG_OPTION_USE_MODULE_ERRORS
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#ifndef FT_ERR_BASE
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#define FT_ERR_BASE FT_Mod_Err_Base
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#endif
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#else
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#undef FT_ERR_BASE
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#define FT_ERR_BASE 0
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#endif /* FT_CONFIG_OPTION_USE_MODULE_ERRORS */
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/* If FT_ERRORDEF is not defined, we need to define a simple */
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/* enumeration type. */
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/* */
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#ifndef FT_ERRORDEF
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#define FT_INCLUDE_ERR_PROTOS
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#define FT_ERRORDEF( e, v, s ) e = v,
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#define FT_ERROR_START_LIST enum {
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#define FT_ERROR_END_LIST FT_ERR_CAT( FT_ERR_PREFIX, Max ) };
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#ifdef __cplusplus
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#define FT_NEED_EXTERN_C
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extern "C" {
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#endif
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#endif /* !FT_ERRORDEF */
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/* this macro is used to define an error */
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#define FT_ERRORDEF_( e, v, s ) \
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FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v + FT_ERR_BASE, s )
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/* this is only used for <module>_Err_Ok, which must be 0! */
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#define FT_NOERRORDEF_( e, v, s ) \
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FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v, s )
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#ifdef FT_ERROR_START_LIST
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FT_ERROR_START_LIST
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#endif
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/* now include the error codes */
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#include FT_ERROR_DEFINITIONS_H
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#ifdef FT_ERROR_END_LIST
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FT_ERROR_END_LIST
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#endif
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/*******************************************************************/
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/*******************************************************************/
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/***** *****/
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/***** SIMPLE CLEANUP *****/
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/***** *****/
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/*******************************************************************/
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/*******************************************************************/
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#ifdef FT_NEED_EXTERN_C
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}
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#endif
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#undef FT_ERROR_START_LIST
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#undef FT_ERROR_END_LIST
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#undef FT_ERRORDEF
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#undef FT_ERRORDEF_
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#undef FT_NOERRORDEF_
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#undef FT_NEED_EXTERN_C
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#undef FT_ERR_BASE
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/* FT_ERR_PREFIX is needed internally */
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#ifndef FT2_BUILD_LIBRARY
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#undef FT_ERR_PREFIX
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#endif
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/* FT_INCLUDE_ERR_PROTOS: Control if function prototypes should be */
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/* included with `#include FT_ERRORS_H'. This is */
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/* only true where `FT_ERRORDEF` is undefined. */
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/* FT_ERR_PROTOS_DEFINED: Actual multiple-inclusion protection of */
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/* `fterrors.h`. */
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#ifdef FT_INCLUDE_ERR_PROTOS
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#undef FT_INCLUDE_ERR_PROTOS
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#ifndef FT_ERR_PROTOS_DEFINED
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#define FT_ERR_PROTOS_DEFINED
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FT_BEGIN_HEADER
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/**************************************************************************
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*
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* @function:
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* FT_Error_String
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*
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* @description:
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* Retrieve the description of a valid FreeType error code.
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*
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* @input:
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* error_code ::
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* A valid FreeType error code.
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*
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* @return:
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* A C~string or `NULL`, if any error occurred.
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*
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* @note:
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* FreeType has to be compiled with `FT_CONFIG_OPTION_ERROR_STRINGS` or
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* `FT_DEBUG_LEVEL_ERROR` to get meaningful descriptions.
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* 'error_string' will be `NULL` otherwise.
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*
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* Module identification will be ignored:
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*
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* ```c
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* strcmp( FT_Error_String( FT_Err_Unknown_File_Format ),
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* FT_Error_String( BDF_Err_Unknown_File_Format ) ) == 0;
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* ```
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*/
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FT_EXPORT( const char* )
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FT_Error_String( FT_Error error_code );
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FT_END_HEADER
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#endif /* FT_ERR_PROTOS_DEFINED */
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#endif /* FT_INCLUDE_ERR_PROTOS */
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#endif /* !(FTERRORS_H_ && __FTERRORS_H__) */
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/* END */
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