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fterrors.h
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00001 /***************************************************************************/ 00002 /* */ 00003 /* fterrors.h */ 00004 /* */ 00005 /* FreeType error code handling (specification). */ 00006 /* */ 00007 /* Copyright 1996-2001, 2002, 2004, 2007 by */ 00008 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 00009 /* */ 00010 /* This file is part of the FreeType project, and may only be used, */ 00011 /* modified, and distributed under the terms of the FreeType project */ 00012 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 00013 /* this file you indicate that you have read the license and */ 00014 /* understand and accept it fully. */ 00015 /* */ 00016 /***************************************************************************/ 00017 00018 00019 /*************************************************************************/ 00020 /* */ 00021 /* This special header file is used to define the handling of FT2 */ 00022 /* enumeration constants. It can also be used to generate error message */ 00023 /* strings with a small macro trick explained below. */ 00024 /* */ 00025 /* I - Error Formats */ 00026 /* ----------------- */ 00027 /* */ 00028 /* The configuration macro FT_CONFIG_OPTION_USE_MODULE_ERRORS can be */ 00029 /* defined in ftoption.h in order to make the higher byte indicate */ 00030 /* the module where the error has happened (this is not compatible */ 00031 /* with standard builds of FreeType 2). You can then use the macro */ 00032 /* FT_ERROR_BASE macro to extract the generic error code from an */ 00033 /* FT_Error value. */ 00034 /* */ 00035 /* */ 00036 /* II - Error Message strings */ 00037 /* -------------------------- */ 00038 /* */ 00039 /* The error definitions below are made through special macros that */ 00040 /* allow client applications to build a table of error message strings */ 00041 /* if they need it. The strings are not included in a normal build of */ 00042 /* FreeType 2 to save space (most client applications do not use */ 00043 /* them). */ 00044 /* */ 00045 /* To do so, you have to define the following macros before including */ 00046 /* this file: */ 00047 /* */ 00048 /* FT_ERROR_START_LIST :: */ 00049 /* This macro is called before anything else to define the start of */ 00050 /* the error list. It is followed by several FT_ERROR_DEF calls */ 00051 /* (see below). */ 00052 /* */ 00053 /* FT_ERROR_DEF( e, v, s ) :: */ 00054 /* This macro is called to define one single error. */ 00055 /* `e' is the error code identifier (e.g. FT_Err_Invalid_Argument). */ 00056 /* `v' is the error numerical value. */ 00057 /* `s' is the corresponding error string. */ 00058 /* */ 00059 /* FT_ERROR_END_LIST :: */ 00060 /* This macro ends the list. */ 00061 /* */ 00062 /* Additionally, you have to undefine __FTERRORS_H__ before #including */ 00063 /* this file. */ 00064 /* */ 00065 /* Here is a simple example: */ 00066 /* */ 00067 /* { */ 00068 /* #undef __FTERRORS_H__ */ 00069 /* #define FT_ERRORDEF( e, v, s ) { e, s }, */ 00070 /* #define FT_ERROR_START_LIST { */ 00071 /* #define FT_ERROR_END_LIST { 0, 0 } }; */ 00072 /* */ 00073 /* const struct */ 00074 /* { */ 00075 /* int err_code; */ 00076 /* const char* err_msg; */ 00077 /* } ft_errors[] = */ 00078 /* */ 00079 /* #include FT_ERRORS_H */ 00080 /* } */ 00081 /* */ 00082 /*************************************************************************/ 00083 00084 00085 #ifndef __FTERRORS_H__ 00086 #define __FTERRORS_H__ 00087 00088 00089 /* include module base error codes */ 00090 #include FT_MODULE_ERRORS_H 00091 00092 00093 /*******************************************************************/ 00094 /*******************************************************************/ 00095 /***** *****/ 00096 /***** SETUP MACROS *****/ 00097 /***** *****/ 00098 /*******************************************************************/ 00099 /*******************************************************************/ 00100 00101 00102 #undef FT_NEED_EXTERN_C 00103 00104 #undef FT_ERR_XCAT 00105 #undef FT_ERR_CAT 00106 00107 #define FT_ERR_XCAT( x, y ) x ## y 00108 #define FT_ERR_CAT( x, y ) FT_ERR_XCAT( x, y ) 00109 00110 00111 /* FT_ERR_PREFIX is used as a prefix for error identifiers. */ 00112 /* By default, we use `FT_Err_'. */ 00113 /* */ 00114 #ifndef FT_ERR_PREFIX 00115 #define FT_ERR_PREFIX FT_Err_ 00116 #endif 00117 00118 00119 /* FT_ERR_BASE is used as the base for module-specific errors. */ 00120 /* */ 00121 #ifdef FT_CONFIG_OPTION_USE_MODULE_ERRORS 00122 00123 #ifndef FT_ERR_BASE 00124 #define FT_ERR_BASE FT_Mod_Err_Base 00125 #endif 00126 00127 #else 00128 00129 #undef FT_ERR_BASE 00130 #define FT_ERR_BASE 0 00131 00132 #endif /* FT_CONFIG_OPTION_USE_MODULE_ERRORS */ 00133 00134 00135 /* If FT_ERRORDEF is not defined, we need to define a simple */ 00136 /* enumeration type. */ 00137 /* */ 00138 #ifndef FT_ERRORDEF 00139 00140 #define FT_ERRORDEF( e, v, s ) e = v, 00141 #define FT_ERROR_START_LIST enum { 00142 #define FT_ERROR_END_LIST FT_ERR_CAT( FT_ERR_PREFIX, Max ) }; 00143 00144 #ifdef __cplusplus 00145 #define FT_NEED_EXTERN_C 00146 extern "C" { 00147 #endif 00148 00149 #endif /* !FT_ERRORDEF */ 00150 00151 00152 /* this macro is used to define an error */ 00153 #define FT_ERRORDEF_( e, v, s ) \ 00154 FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v + FT_ERR_BASE, s ) 00155 00156 /* this is only used for <module>_Err_Ok, which must be 0! */ 00157 #define FT_NOERRORDEF_( e, v, s ) \ 00158 FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v, s ) 00159 00160 00161 #ifdef FT_ERROR_START_LIST 00162 FT_ERROR_START_LIST 00163 #endif 00164 00165 00166 /* now include the error codes */ 00167 #include FT_ERROR_DEFINITIONS_H 00168 00169 00170 #ifdef FT_ERROR_END_LIST 00171 FT_ERROR_END_LIST 00172 #endif 00173 00174 00175 /*******************************************************************/ 00176 /*******************************************************************/ 00177 /***** *****/ 00178 /***** SIMPLE CLEANUP *****/ 00179 /***** *****/ 00180 /*******************************************************************/ 00181 /*******************************************************************/ 00182 00183 #ifdef FT_NEED_EXTERN_C 00184 } 00185 #endif 00186 00187 #undef FT_ERROR_START_LIST 00188 #undef FT_ERROR_END_LIST 00189 00190 #undef FT_ERRORDEF 00191 #undef FT_ERRORDEF_ 00192 #undef FT_NOERRORDEF_ 00193 00194 #undef FT_NEED_EXTERN_C 00195 #undef FT_ERR_CONCAT 00196 #undef FT_ERR_BASE 00197 00198 /* FT_KEEP_ERR_PREFIX is needed for ftvalid.h */ 00199 #ifndef FT_KEEP_ERR_PREFIX 00200 #undef FT_ERR_PREFIX 00201 #endif 00202 00203 #endif /* __FTERRORS_H__ */ 00204 00205 00206 /* END */
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