/**************************************************************************** * * pserror.h * * Adobe's code for error handling (specification). * * Copyright 2006-2013 Adobe Systems Incorporated. * * This software, and all works of authorship, whether in source or * object code form as indicated by the copyright notice(s) included * herein (collectively, the "Work") is made available, and may only be * used, modified, and distributed under the FreeType Project License, * LICENSE.TXT. Additionally, subject to the terms and conditions of the * FreeType Project License, each contributor to the Work hereby grants * to any individual or legal entity exercising permissions granted by * the FreeType Project License and this section (hereafter, "You" or * "Your") a perpetual, worldwide, non-exclusive, no-charge, * royalty-free, irrevocable (except as stated in this section) patent * license to make, have made, use, offer to sell, sell, import, and * otherwise transfer the Work, where such license applies only to those * patent claims licensable by such contributor that are necessarily * infringed by their contribution(s) alone or by combination of their * contribution(s) with the Work to which such contribution(s) was * submitted. If You institute patent litigation against any entity * (including a cross-claim or counterclaim in a lawsuit) alleging that * the Work or a contribution incorporated within the Work constitutes * direct or contributory patent infringement, then any patent licenses * granted to You under this License for that Work shall terminate as of * the date such litigation is filed. * * By using, modifying, or distributing the Work you indicate that you * have read and understood the terms and conditions of the * FreeType Project License as well as those provided in this section, * and you accept them fully. * */ #ifndef PSERROR_H_ #define PSERROR_H_ #include <freetype/ftmoderr.h> #undef FTERRORS_H_ #undef FT_ERR_PREFIX #define FT_ERR_PREFIX … #define FT_ERR_BASE … #include <freetype/fterrors.h> #include <freetype/internal/compiler-macros.h> #include "psft.h" FT_BEGIN_HEADER /* * A poor-man error facility. * * This code being written in vanilla C, doesn't have the luxury of a * language-supported exception mechanism such as the one available in * Java. Instead, we are stuck with using error codes that must be * carefully managed and preserved. However, it is convenient for us to * model our error mechanism on a Java-like exception mechanism. * When we assign an error code we are thus `throwing' an error. * * The preservation of an error code is done by coding convention. * Upon a function call if the error code is anything other than * `FT_Err_Ok', which is guaranteed to be zero, we * will return without altering that error. This will allow the * error to propagate and be handled at the appropriate location in * the code. * * This allows a style of code where the error code is initialized * up front and a block of calls are made with the error code only * being checked after the block. If a new error occurs, the original * error will be preserved and a functional no-op should result in any * subsequent function that has an initial error code not equal to * `FT_Err_Ok'. * * Errors are encoded by calling the `FT_THROW' macro. For example, * * { * FT_Error e; * * * ... * e = FT_THROW( Out_Of_Memory ); * } * */ /* Set error code to a particular value. */ FT_LOCAL( void ) cf2_setError( FT_Error* error, FT_Error value ); /* * A macro that conditionally sets an error code. * * This macro will first check whether `error' is set; * if not, it will set it to `e'. * */ #define CF2_SET_ERROR( error, e ) … FT_END_HEADER #endif /* PSERROR_H_ */ /* END */
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