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/***************************************************************************/
/*                                                                         */
/*  fterrors.h                                                             */
/*                                                                         */
/*    FreeType error code handling (specification).                        */
/*                                                                         */
/*  Copyright 1996-2018 by                                                 */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/

/*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*   error_enumerations                                                  */
  /*                                                                       */
  /* <Title>                                                               */
  /*   Error Enumerations                                                  */
  /*                                                                       */
  /* <Abstract>                                                            */
  /*   How to handle errors and error strings.                             */
  /*                                                                       */
  /* <Description>                                                         */
  /*   The header file `fterrors.h' (which is automatically included by    */
  /*   `freetype.h' defines the handling of FreeType's enumeration         */
  /*   constants.  It can also be used to generate error message strings   */
  /*   with a small macro trick explained below.                           */
  /*                                                                       */
  /*   *Error* *Formats*                                                   */
  /*                                                                       */
  /*   The configuration macro FT_CONFIG_OPTION_USE_MODULE_ERRORS can be   */
  /*   defined in `ftoption.h' in order to make the higher byte indicate   */
  /*   the module where the error has happened (this is not compatible     */
  /*   with standard builds of FreeType~2, however).  See the file         */
  /*   `ftmoderr.h' for more details.                                      */
  /*                                                                       */
  /*   *Error* *Message* *Strings*                                         */
  /*                                                                       */
  /*   Error definitions are set up with special macros that allow client  */
  /*   applications to build a table of error message strings.  The        */
  /*   strings are not included in a normal build of FreeType~2 to save    */
  /*   space (most client applications do not use them).                   */
  /*                                                                       */
  /*   To do so, you have to define the following macros before including  */
  /*   this file.                                                          */
  /*                                                                       */
  /*   {                                                                   */
  /*     FT_ERROR_START_LIST                                               */
  /*   }                                                                   */
  /*                                                                       */
  /*   This macro is called before anything else to define the start of    */
  /*   the error list.  It is followed by several FT_ERROR_DEF calls.      */
  /*                                                                       */
  /*   {                                                                   */
  /*     FT_ERROR_DEF( e, v, s )                                           */
  /*   }                                                                   */
  /*                                                                       */
  /*   This macro is called to define one single error.  `e' is the error  */
  /*   code identifier (e.g., `Invalid_Argument'), `v' is the error's      */
  /*   numerical value, and `s' is the corresponding error string.         */
  /*                                                                       */
  /*   {                                                                   */
  /*     FT_ERROR_END_LIST                                                 */
  /*   }                                                                   */
  /*                                                                       */
  /*   This macro ends the list.                                           */
  /*                                                                       */
  /*   Additionally, you have to undefine `FTERRORS_H_' before #including  */
  /*   this file.                                                          */
  /*                                                                       */
  /*   Here is a simple example.                                           */
  /*                                                                       */
  /*   {                                                                   */
  /*     #undef FTERRORS_H_                                                */
  /*     #define FT_ERRORDEF( e, v, s )  { e, s },                         */
  /*     #define FT_ERROR_START_LIST     {                                 */
  /*     #define FT_ERROR_END_LIST       { 0, NULL } };                    */
  /*                                                                       */
  /*     const struct                                                      */
  /*     {                                                                 */
  /*       int          err_code;                                          */
  /*       const char*  err_msg;                                           */
  /*     } ft_errors[] =                                                   */
  /*                                                                       */
  /*     #include FT_ERRORS_H                                              */
  /*   }                                                                   */
  /*                                                                       */
  /*   Note that `FT_Err_Ok' is _not_ defined with `FT_ERRORDEF' but with  */
  /*   `FT_NOERRORDEF'; it is always zero.                                 */
  /*                                                                       */
  /*************************************************************************/

/* */

/* In previous FreeType versions we used `__FTERRORS_H__'.  However, */
  /* using two successive underscores in a non-system symbol name      */
  /* violates the C (and C++) standard, so it was changed to the       */
  /* current form.  In spite of this, we have to make                  */
  /*                                                                   */
  /*   #undefine __FTERRORS_H__                                        */
  /*                                                                   */
  /* work for backward compatibility.                                  */
  /*                                                                   */
#if !( defined( FTERRORS_H_ ) && defined ( __FTERRORS_H__ ) )
#define FTERRORS_H_
#define __FTERRORS_H__

/* include module base error codes */
#include FT_MODULE_ERRORS_H

/*******************************************************************/
  /*******************************************************************/
  /*****                                                         *****/
  /*****                       SETUP MACROS                      *****/
  /*****                                                         *****/
  /*******************************************************************/
  /*******************************************************************/

#undef  FT_NEED_EXTERN_C

/* FT_ERR_PREFIX is used as a prefix for error identifiers. */
  /* By default, we use `FT_Err_'.                            */
  /*                                                          */
#ifndef FT_ERR_PREFIX
#define FT_ERR_PREFIX  FT_Err_
#endif

/* FT_ERR_BASE is used as the base for module-specific errors. */
  /*                                                             */
#ifdef FT_CONFIG_OPTION_USE_MODULE_ERRORS

#ifndef FT_ERR_BASE
#define FT_ERR_BASE  FT_Mod_Err_Base
#endif

#else

#undef FT_ERR_BASE
#define FT_ERR_BASE  0

#endif /* FT_CONFIG_OPTION_USE_MODULE_ERRORS */

/* If FT_ERRORDEF is not defined, we need to define a simple */
  /* enumeration type.                                         */
  /*                                                           */
#ifndef FT_ERRORDEF

#define FT_ERRORDEF( e, v, s )  e = v,
#define FT_ERROR_START_LIST     enum {
#define FT_ERROR_END_LIST       FT_ERR_CAT( FT_ERR_PREFIX, Max ) };

#ifdef __cplusplus
#define FT_NEED_EXTERN_C
  extern "C" {
#endif

#endif /* !FT_ERRORDEF */

/* this macro is used to define an error */
#define FT_ERRORDEF_( e, v, s )                                             \
          FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v + FT_ERR_BASE, s )

/* this is only used for <module>_Err_Ok, which must be 0! */
#define FT_NOERRORDEF_( e, v, s )                             \
          FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v, s )

#ifdef FT_ERROR_START_LIST
  FT_ERROR_START_LIST
#endif

/* now include the error codes */
#include FT_ERROR_DEFINITIONS_H

#ifdef FT_ERROR_END_LIST
  FT_ERROR_END_LIST
#endif

/*******************************************************************/
  /*******************************************************************/
  /*****                                                         *****/
  /*****                      SIMPLE CLEANUP                     *****/
  /*****                                                         *****/
  /*******************************************************************/
  /*******************************************************************/

#ifdef FT_NEED_EXTERN_C
  }
#endif

#undef FT_ERROR_START_LIST
#undef FT_ERROR_END_LIST

#undef FT_ERRORDEF
#undef FT_ERRORDEF_
#undef FT_NOERRORDEF_

#undef FT_NEED_EXTERN_C
#undef FT_ERR_BASE

/* FT_ERR_PREFIX is needed internally */
#ifndef FT2_BUILD_LIBRARY
#undef FT_ERR_PREFIX
#endif

#endif /* !(FTERRORS_H_ && __FTERRORS_H__) */

/* END */

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