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/****************************************************************************
*
* 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 FT_MODULE_ERRORS_H
#undef FTERRORS_H_
#undef FT_ERR_PREFIX
#define FT_ERR_PREFIX CF2_Err_
#define FT_ERR_BASE FT_Mod_Err_CF2
#include FT_ERRORS_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 ) \
cf2_setError( error, FT_THROW( e ) )
FT_END_HEADER
#endif /* PSERROR_H_ */
/* END */
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