include/SDL_error.h

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

/**
 *  \file SDL_error.h
 *
 *  Simple error message routines for SDL.
 */

#ifndef SDL_error_h_
#define SDL_error_h_

#include "SDL_stdinc.h"

#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif

/* Public functions */


/**
 *  \brief Set the error message for the current thread
 *
 *  \return -1, there is no error handling for this function
 */
extern DECLSPEC int SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);

/**
 *  \brief Get the last error message that was set
 *
 * SDL API functions may set error messages and then succeed, so you should
 * only use the error value if a function fails.
 * 
 * This returns a pointer to a static buffer for convenience and should not
 * be called by multiple threads simultaneously.
 *
 *  \return a pointer to the last error message that was set
 */
extern DECLSPEC const char *SDLCALL SDL_GetError(void);

/**
 *  \brief Get the last error message that was set for the current thread
 *
 * SDL API functions may set error messages and then succeed, so you should
 * only use the error value if a function fails.
 * 
 *  \param errstr A buffer to fill with the last error message that was set
 *                for the current thread
 *  \param maxlen The size of the buffer pointed to by the errstr parameter
 *
 *  \return errstr
 */
extern DECLSPEC char * SDLCALL SDL_GetErrorMsg(char *errstr, int maxlen);

/**
 *  \brief Clear the error message for the current thread
 */
extern DECLSPEC void SDLCALL SDL_ClearError(void);

/**
 *  \name Internal error functions
 *
 *  \internal
 *  Private error reporting function - used internally.
 */
/* @{ */
#define SDL_OutOfMemory()   SDL_Error(SDL_ENOMEM)
#define SDL_Unsupported()   SDL_Error(SDL_UNSUPPORTED)
#define SDL_InvalidParamError(param)    SDL_SetError("Parameter '%s' is invalid", (param))
typedef enum
{
    SDL_ENOMEM,
    SDL_EFREAD,
    SDL_EFWRITE,
    SDL_EFSEEK,
    SDL_UNSUPPORTED,
    SDL_LASTERROR
} SDL_errorcode;
/* SDL_Error() unconditionally returns -1. */
extern DECLSPEC int SDLCALL SDL_Error(SDL_errorcode code);
/* @} *//* Internal error functions */

/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#include "close_code.h"

#endif /* SDL_error_h_ */

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