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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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 *  \file SDL_error.h
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 *
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 *  Simple error message routines for SDL.
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 */
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#ifndef SDL_error_h_
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#define SDL_error_h_
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#include "SDL_stdinc.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Public functions */
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/**
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 * Set the SDL error message for the current thread.
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 *
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 * Calling this function will replace any previous error message that was set.
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 *
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 * This function always returns -1, since SDL frequently uses -1 to signify an
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 * failing result, leading to this idiom:
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 *
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 * ```c
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 * if (error_code) {
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 *     return SDL_SetError("This operation has failed: %d", error_code);
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 * }
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 * ```
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 *
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 * \param fmt a printf()-style message format string
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 * \param ... additional parameters matching % tokens in the `fmt` string, if
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 *            any
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 * \returns always -1.
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 *
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 * \since This function is available since SDL 2.0.0.
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 *
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 * \sa SDL_ClearError
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 * \sa SDL_GetError
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 */
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extern DECLSPEC int SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);
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/**
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 * Retrieve a message about the last error that occurred on the current
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 * thread.
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 *
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 * It is possible for multiple errors to occur before calling SDL_GetError().
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 * Only the last error is returned.
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 *
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 * The message is only applicable when an SDL function has signaled an error.
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 * You must check the return values of SDL function calls to determine when to
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 * appropriately call SDL_GetError(). You should *not* use the results of
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 * SDL_GetError() to decide if an error has occurred! Sometimes SDL will set
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 * an error string even when reporting success.
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 *
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 * SDL will *not* clear the error string for successful API calls. You *must*
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 * check return values for failure cases before you can assume the error
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 * string applies.
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 *
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 * Error strings are set per-thread, so an error set in a different thread
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 * will not interfere with the current thread's operation.
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 *
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 * The returned string is internally allocated and must not be freed by the
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 * application.
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 *
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 * \returns a message with information about the specific error that occurred,
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 *          or an empty string if there hasn't been an error message set since
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 *          the last call to SDL_ClearError(). The message is only applicable
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 *          when an SDL function has signaled an error. You must check the
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 *          return values of SDL function calls to determine when to
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 *          appropriately call SDL_GetError().
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 *
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 * \since This function is available since SDL 2.0.0.
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 *
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 * \sa SDL_ClearError
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 * \sa SDL_SetError
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 */
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extern DECLSPEC const char *SDLCALL SDL_GetError(void);
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/**
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 * Get the last error message that was set for the current thread.
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 *
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 * This allows the caller to copy the error string into a provided buffer, but
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 * otherwise operates exactly the same as SDL_GetError().
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 *
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 * \param errstr A buffer to fill with the last error message that was set for
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 *               the current thread
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 * \param maxlen The size of the buffer pointed to by the errstr parameter
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 * \returns the pointer passed in as the `errstr` parameter.
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 *
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 * \since This function is available since SDL 2.0.14.
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 *
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 * \sa SDL_GetError
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 */
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extern DECLSPEC char * SDLCALL SDL_GetErrorMsg(char *errstr, int maxlen);
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/**
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 * Clear any previous error message for this thread.
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 *
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 * \since This function is available since SDL 2.0.0.
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 *
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 * \sa SDL_GetError
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 * \sa SDL_SetError
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 */
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extern DECLSPEC void SDLCALL SDL_ClearError(void);
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/**
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 *  \name Internal error functions
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 *
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 *  \internal
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 *  Private error reporting function - used internally.
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 */
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/* @{ */
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#define SDL_OutOfMemory()   SDL_Error(SDL_ENOMEM)
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#define SDL_Unsupported()   SDL_Error(SDL_UNSUPPORTED)
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#define SDL_InvalidParamError(param)    SDL_SetError("Parameter '%s' is invalid", (param))
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typedef enum
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{
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    SDL_ENOMEM,
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    SDL_EFREAD,
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    SDL_EFWRITE,
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    SDL_EFSEEK,
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    SDL_UNSUPPORTED,
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    SDL_LASTERROR
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} SDL_errorcode;
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/* SDL_Error() unconditionally returns -1. */
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extern DECLSPEC int SDLCALL SDL_Error(SDL_errorcode code);
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/* @} *//* Internal error functions */
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* SDL_error_h_ */
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/* vi: set ts=4 sw=4 expandtab: */