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fterrors.h

/***************************************************************************/
/*                                                                         */
/*  fterrors.h                                                             */
/*                                                                         */
/*    FreeType error code handling (specification).                        */
/*                                                                         */
/*  Copyright 1996-2001, 2002, 2004 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.                                        */
/*                                                                         */
/***************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* This special header file is used to define the handling of FT2        */
  /* enumeration constants.  It can also be used to generate error message */
  /* strings with a small macro trick explained below.                     */
  /*                                                                       */
  /* I - 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).  You can then use the macro    */
  /*   FT_ERROR_BASE macro to extract the generic error code from an       */
  /*   FT_Error value.                                                     */
  /*                                                                       */
  /*                                                                       */
  /* II - Error Message strings                                            */
  /* --------------------------                                            */
  /*                                                                       */
  /*   The error definitions below are made through special macros that    */
  /*   allow client applications to build a table of error message strings */
  /*   if they need it.  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     */
  /*     (see below).                                                      */
  /*                                                                       */
  /*   FT_ERROR_DEF( e, v, s ) ::                                          */
  /*     This macro is called to define one single error.                  */
  /*     `e' is the error code identifier (e.g. FT_Err_Invalid_Argument).  */
  /*     `v' is the error numerical value.                                 */
  /*     `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, 0 } };                     */
  /*                                                                       */
  /*       const struct                                                    */
  /*       {                                                               */
  /*         int          err_code;                                        */
  /*         const char*  err_msg                                          */
  /*       } ft_errors[] =                                                 */
  /*                                                                       */
  /*       #include FT_ERRORS_H                                            */
  /*     }                                                                 */
  /*                                                                       */
  /*************************************************************************/


#ifndef __FTERRORS_H__
#define __FTERRORS_H__


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


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


#undef  FT_NEED_EXTERN_C

#undef  FT_ERR_XCAT
#undef  FT_ERR_CAT

#define FT_ERR_XCAT( x, y )  x ## y
#define FT_ERR_CAT( x, y )   FT_ERR_XCAT( x, y )


  /* 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_CONCAT
#undef FT_ERR_BASE

  /* FT_KEEP_ERR_PREFIX is needed for ftvalid.h */
#ifndef FT_KEEP_ERR_PREFIX
#undef FT_ERR_PREFIX
#endif

#endif /* __FTERRORS_H__ */


/* END */

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