SDL_error.h
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 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.
*/
/**
* # CategoryError
*
* 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 */
/**
* Set the SDL error message for the current thread.
*
* Calling this function will replace any previous error message that was set.
*
* This function always returns -1, since SDL frequently uses -1 to signify an
* failing result, leading to this idiom:
*
* ```c
* if (error_code) {
* return SDL_SetError("This operation has failed: %d", error_code);
* }
* ```
*
* \param fmt a printf()-style message format string.
* \param ... additional parameters matching % tokens in the `fmt` string, if
* any.
* \returns always -1.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_ClearError
* \sa SDL_GetError
*/
extern DECLSPEC int SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);
/**
* Retrieve a message about the last error that occurred on the current
* thread.
*
* It is possible for multiple errors to occur before calling SDL_GetError().
* Only the last error is returned.
*
* The message is only applicable when an SDL function has signaled an error.
* You must check the return values of SDL function calls to determine when to
* appropriately call SDL_GetError(). You should *not* use the results of
* SDL_GetError() to decide if an error has occurred! Sometimes SDL will set
* an error string even when reporting success.
*
* SDL will *not* clear the error string for successful API calls. You *must*
* check return values for failure cases before you can assume the error
* string applies.
*
* Error strings are set per-thread, so an error set in a different thread
* will not interfere with the current thread's operation.
*
* The returned string is internally allocated and must not be freed by the
* application.
*
* \returns a message with information about the specific error that occurred,
* or an empty string if there hasn't been an error message set since
* the last call to SDL_ClearError(). The message is only applicable
* when an SDL function has signaled an error. You must check the
* return values of SDL function calls to determine when to
* appropriately call SDL_GetError().
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_ClearError
* \sa SDL_SetError
*/
extern DECLSPEC const char *SDLCALL SDL_GetError(void);
/**
* Get the last error message that was set for the current thread.
*
* This allows the caller to copy the error string into a provided buffer, but
* otherwise operates exactly the same as SDL_GetError().
*
* \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.
* \returns the pointer passed in as the `errstr` parameter.
*
* \since This function is available since SDL 2.0.14.
*
* \sa SDL_GetError
*/
extern DECLSPEC char * SDLCALL SDL_GetErrorMsg(char *errstr, int maxlen);
/**
* Clear any previous error message for this thread.
*
* \since This function is available since SDL 2.0.0.
*
* \sa SDL_GetError
* \sa SDL_SetError
*/
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_ */
/* vi: set ts=4 sw=4 expandtab: */
SDL_SetError
int SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt,...) SDL_PRINTF_VARARG_FUNC(1)
SDL_GetErrorMsg
char * SDL_GetErrorMsg(char *errstr, int maxlen)
SDL_errorcode
SDL_errorcode
Definition SDL_error.h:143
SDL_EFSEEK
@ SDL_EFSEEK
Definition SDL_error.h:147
SDL_LASTERROR
@ SDL_LASTERROR
Definition SDL_error.h:149
SDL_EFWRITE
@ SDL_EFWRITE
Definition SDL_error.h:146
SDL_UNSUPPORTED
@ SDL_UNSUPPORTED
Definition SDL_error.h:148
SDL_EFREAD
@ SDL_EFREAD
Definition SDL_error.h:145
SDL_ENOMEM
@ SDL_ENOMEM
Definition SDL_error.h:144
SDL_GetError
const char * SDL_GetError(void)
SDL_Error
int SDL_Error(SDL_errorcode code)
SDL_ClearError
void SDL_ClearError(void)
SDL_stdinc.h
SDL_PRINTF_FORMAT_STRING
#define SDL_PRINTF_FORMAT_STRING
Definition SDL_stdinc.h:375
SDL_PRINTF_VARARG_FUNC
#define SDL_PRINTF_VARARG_FUNC(fmtargnumber)
Definition SDL_stdinc.h:384
begin_code.h
close_code.h