1 /***************************************************************************/
5 /* FreeType error code handling (specification). */
7 /* Copyright 1996-2001, 2002 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
16 /***************************************************************************/
19 /*************************************************************************/
21 /* This special header file is used to define the handling of FT2 */
22 /* enumeration constants. It can also be used to generate error message */
23 /* strings with a small macro trick explained below. */
25 /* I - Error Formats */
26 /* ----------------- */
28 /* Since release 2.1, the error constants have changed. The lower */
29 /* byte of the error value gives the "generic" error code, while the */
30 /* higher byte indicates in which module the error occurred. */
32 /* You can use the macro FT_ERROR_BASE(x) macro to extract the generic */
33 /* error code from an FT_Error value. */
35 /* The configuration macro FT_CONFIG_OPTION_USE_MODULE_ERRORS can be */
36 /* undefined in ftoption.h in order to make the higher byte always */
37 /* zero, in case you need to be compatible with previous versions of */
41 /* II - Error Message strings */
42 /* -------------------------- */
44 /* The error definitions below are made through special macros that */
45 /* allow client applications to build a table of error message strings */
46 /* if they need it. The strings are not included in a normal build of */
47 /* FreeType 2 to save space (most client applications do not use */
50 /* To do so, you have to define the following macros before including */
53 /* FT_ERROR_START_LIST :: */
54 /* This macro is called before anything else to define the start of */
55 /* the error list. It is followed by several FT_ERROR_DEF calls */
58 /* FT_ERROR_DEF( e, v, s ) :: */
59 /* This macro is called to define one single error. */
60 /* `e' is the error code identifier (e.g. FT_Err_Invalid_Argument). */
61 /* `v' is the error numerical value. */
62 /* `s' is the corresponding error string. */
64 /* FT_ERROR_END_LIST :: */
65 /* This macro ends the list. */
67 /* Additionally, you have to undefine __FTERRORS_H__ before #including */
70 /* Here is a simple example: */
73 /* #undef __FTERRORS_H__ */
74 /* #define FT_ERRORDEF( e, v, s ) { e, s }, */
75 /* #define FT_ERROR_START_LIST { */
76 /* #define FT_ERROR_END_LIST { 0, 0 } }; */
81 /* const char* err_msg */
84 /* #include FT_ERRORS_H */
87 /*************************************************************************/
90 #ifndef __FTERRORS_H__
91 #define __FTERRORS_H__
94 /* include module base error codes */
95 #include FT_MODULE_ERRORS_H
98 /*******************************************************************/
99 /*******************************************************************/
101 /***** SETUP MACROS *****/
103 /*******************************************************************/
104 /*******************************************************************/
107 #undef FT_NEED_EXTERN_C
112 #define FT_ERR_XCAT( x, y ) x ## y
113 #define FT_ERR_CAT( x, y ) FT_ERR_XCAT( x, y )
116 /* FT_ERR_PREFIX is used as a prefix for error identifiers. */
117 /* By default, we use `FT_Err_'. */
119 #ifndef FT_ERR_PREFIX
120 #define FT_ERR_PREFIX FT_Err_
124 /* FT_ERR_BASE is used as the base for module-specific errors. */
126 #ifdef FT_CONFIG_OPTION_USE_MODULE_ERRORS
129 #define FT_ERR_BASE FT_Mod_Err_Base
135 #define FT_ERR_BASE 0
137 #endif /* FT_CONFIG_OPTION_USE_MODULE_ERRORS */
140 /* If FT_ERRORDEF is not defined, we need to define a simple */
141 /* enumeration type. */
145 #define FT_ERRORDEF( e, v, s ) e = v,
146 #define FT_ERROR_START_LIST enum {
147 #define FT_ERROR_END_LIST FT_ERR_CAT( FT_ERR_PREFIX, Max ) };
150 #define FT_NEED_EXTERN_C
154 #endif /* !FT_ERRORDEF */
157 /* this macro is used to define an error */
158 #define FT_ERRORDEF_( e, v, s ) \
159 FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v + FT_ERR_BASE, s )
161 /* this is only used for FT_Err_Ok, which must be 0! */
162 #define FT_NOERRORDEF_( e, v, s ) \
163 FT_ERRORDEF( FT_ERR_CAT( FT_ERR_PREFIX, e ), v, s )
166 #ifdef FT_ERROR_START_LIST
171 /* no include the error codes */
172 #include FT_ERROR_DEFINITIONS_H
175 #ifdef FT_ERROR_END_LIST
180 /*******************************************************************/
181 /*******************************************************************/
183 /***** SIMPLE CLEANUP *****/
185 /*******************************************************************/
186 /*******************************************************************/
188 #ifdef FT_NEED_EXTERN_C
192 #undef FT_ERROR_START_LIST
193 #undef FT_ERROR_END_LIST
197 #undef FT_NOERRORDEF_
199 #undef FT_NEED_EXTERN_C
204 #endif /* __FTERRORS_H__ */