reactos/lib/3rdparty/freetype/src/cff/cf2error.h

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  cf2error.h                                                             */
   4 /*                                                                         */
   5 /*    Adobe's code for error handling (specification).                     */
   6 /*                                                                         */
   7 /*  Copyright 2006-2013 Adobe Systems Incorporated.                        */
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  35 /*                                                                         */
  36 /***************************************************************************/
  37
  38
  39 #ifndef __CF2ERROR_H__
  40 #define __CF2ERROR_H__
  41
  42
  43 #include FT_MODULE_ERRORS_H
  44
  45 #undef __FTERRORS_H__
  46
  47 #undef  FT_ERR_PREFIX
  48 #define FT_ERR_PREFIX  CF2_Err_
  49 #define FT_ERR_BASE    FT_Mod_Err_CF2
  50
  51
  52 #include FT_ERRORS_H
  53 #include "cf2ft.h"
  54
  55
  56 FT_BEGIN_HEADER
  57
  58
  59   /*
  60    * A poor-man error facility.
  61    *
  62    * This code being written in vanilla C, doesn't have the luxury of a
  63    * language-supported exception mechanism such as the one available in
  64    * Java.  Instead, we are stuck with using error codes that must be
  65    * carefully managed and preserved.  However, it is convenient for us to
  66    * model our error mechanism on a Java-like exception mechanism.
  67    * When we assign an error code we are thus `throwing' an error.
  68    *
  69    * The perservation of an error code is done by coding convention.
  70    * Upon a function call if the error code is anything other than
  71    * `FT_Err_Ok', which is guaranteed to be zero, we
  72    * will return without altering that error.  This will allow the
  73    * error to propogate and be handled at the appropriate location in
  74    * the code.
  75    *
  76    * This allows a style of code where the error code is initialized
  77    * up front and a block of calls are made with the error code only
  78    * being checked after the block.  If a new error occurs, the original
  79    * error will be preserved and a functional no-op should result in any
  80    * subsequent function that has an initial error code not equal to
  81    * `FT_Err_Ok'.
  82    *
  83    * Errors are encoded by calling the `FT_THROW' macro.  For example,
  84    *
  85    * {
  86    *   FT_Error  e;
  87    *
  88    *
  89    *   ...
  90    *   e = FT_THROW( Out_Of_Memory );
  91    * }
  92    *
  93    */
  94
  95
  96   /* Set error code to a particular value. */
  97   FT_LOCAL( void )
  98   cf2_setError( FT_Error*  error,
  99                 FT_Error   value );
 100
 101
 102   /*
 103    * A macro that conditionally sets an error code.
 104    *
 105    * This macro will first check whether `error' is set;
 106    * if not, it will set it to `e'.
 107    *
 108   */
 109 #define CF2_SET_ERROR( error, e )              \
 110           cf2_setError( error, FT_THROW( e ) )
 111
 112
 113 FT_END_HEADER
 114
 115
 116 #endif /* __CF2ERROR_H__ */
 117
 118
 119 /* END */