Subversion Repositories Games.Carmageddon

Rev

Blame | Last modification | View Log | Download | RSS feed

  1. /*
  2.   Simple DirectMedia Layer
  3.   Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
  4.  
  5.   This software is provided 'as-is', without any express or implied
  6.   warranty.  In no event will the authors be held liable for any damages
  7.   arising from the use of this software.
  8.  
  9.   Permission is granted to anyone to use this software for any purpose,
  10.   including commercial applications, and to alter it and redistribute it
  11.   freely, subject to the following restrictions:
  12.  
  13.   1. The origin of this software must not be misrepresented; you must not
  14.      claim that you wrote the original software. If you use this software
  15.      in a product, an acknowledgment in the product documentation would be
  16.      appreciated but is not required.
  17.   2. Altered source versions must be plainly marked as such, and must not be
  18.      misrepresented as being the original software.
  19.   3. This notice may not be removed or altered from any source distribution.
  20. */
  21.  
  22. /**
  23.  *  \file SDL_error.h
  24.  *
  25.  *  Simple error message routines for SDL.
  26.  */
  27.  
  28. #ifndef SDL_error_h_
  29. #define SDL_error_h_
  30.  
  31. #include "SDL_stdinc.h"
  32.  
  33. #include "begin_code.h"
  34. /* Set up for C function definitions, even when using C++ */
  35. #ifdef __cplusplus
  36. extern "C" {
  37. #endif
  38.  
  39. /* Public functions */
  40.  
  41.  
  42. /**
  43.  * Set the SDL error message for the current thread.
  44.  *
  45.  * Calling this function will replace any previous error message that was set.
  46.  *
  47.  * This function always returns -1, since SDL frequently uses -1 to signify an
  48.  * failing result, leading to this idiom:
  49.  *
  50.  * ```c
  51.  * if (error_code) {
  52.  *     return SDL_SetError("This operation has failed: %d", error_code);
  53.  * }
  54.  * ```
  55.  *
  56.  * \param fmt a printf()-style message format string
  57.  * \param ... additional parameters matching % tokens in the `fmt` string, if
  58.  *            any
  59.  * \returns always -1.
  60.  *
  61.  * \since This function is available since SDL 2.0.0.
  62.  *
  63.  * \sa SDL_ClearError
  64.  * \sa SDL_GetError
  65.  */
  66. extern DECLSPEC int SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);
  67.  
  68. /**
  69.  * Retrieve a message about the last error that occurred on the current
  70.  * thread.
  71.  *
  72.  * It is possible for multiple errors to occur before calling SDL_GetError().
  73.  * Only the last error is returned.
  74.  *
  75.  * The message is only applicable when an SDL function has signaled an error.
  76.  * You must check the return values of SDL function calls to determine when to
  77.  * appropriately call SDL_GetError(). You should *not* use the results of
  78.  * SDL_GetError() to decide if an error has occurred! Sometimes SDL will set
  79.  * an error string even when reporting success.
  80.  *
  81.  * SDL will *not* clear the error string for successful API calls. You *must*
  82.  * check return values for failure cases before you can assume the error
  83.  * string applies.
  84.  *
  85.  * Error strings are set per-thread, so an error set in a different thread
  86.  * will not interfere with the current thread's operation.
  87.  *
  88.  * The returned string is internally allocated and must not be freed by the
  89.  * application.
  90.  *
  91.  * \returns a message with information about the specific error that occurred,
  92.  *          or an empty string if there hasn't been an error message set since
  93.  *          the last call to SDL_ClearError(). The message is only applicable
  94.  *          when an SDL function has signaled an error. You must check the
  95.  *          return values of SDL function calls to determine when to
  96.  *          appropriately call SDL_GetError().
  97.  *
  98.  * \since This function is available since SDL 2.0.0.
  99.  *
  100.  * \sa SDL_ClearError
  101.  * \sa SDL_SetError
  102.  */
  103. extern DECLSPEC const char *SDLCALL SDL_GetError(void);
  104.  
  105. /**
  106.  * Get the last error message that was set for the current thread.
  107.  *
  108.  * This allows the caller to copy the error string into a provided buffer, but
  109.  * otherwise operates exactly the same as SDL_GetError().
  110.  *
  111.  * \param errstr A buffer to fill with the last error message that was set for
  112.  *               the current thread
  113.  * \param maxlen The size of the buffer pointed to by the errstr parameter
  114.  * \returns the pointer passed in as the `errstr` parameter.
  115.  *
  116.  * \since This function is available since SDL 2.0.14.
  117.  *
  118.  * \sa SDL_GetError
  119.  */
  120. extern DECLSPEC char * SDLCALL SDL_GetErrorMsg(char *errstr, int maxlen);
  121.  
  122. /**
  123.  * Clear any previous error message for this thread.
  124.  *
  125.  * \since This function is available since SDL 2.0.0.
  126.  *
  127.  * \sa SDL_GetError
  128.  * \sa SDL_SetError
  129.  */
  130. extern DECLSPEC void SDLCALL SDL_ClearError(void);
  131.  
  132. /**
  133.  *  \name Internal error functions
  134.  *
  135.  *  \internal
  136.  *  Private error reporting function - used internally.
  137.  */
  138. /* @{ */
  139. #define SDL_OutOfMemory()   SDL_Error(SDL_ENOMEM)
  140. #define SDL_Unsupported()   SDL_Error(SDL_UNSUPPORTED)
  141. #define SDL_InvalidParamError(param)    SDL_SetError("Parameter '%s' is invalid", (param))
  142. typedef enum
  143. {
  144.     SDL_ENOMEM,
  145.     SDL_EFREAD,
  146.     SDL_EFWRITE,
  147.     SDL_EFSEEK,
  148.     SDL_UNSUPPORTED,
  149.     SDL_LASTERROR
  150. } SDL_errorcode;
  151. /* SDL_Error() unconditionally returns -1. */
  152. extern DECLSPEC int SDLCALL SDL_Error(SDL_errorcode code);
  153. /* @} *//* Internal error functions */
  154.  
  155. /* Ends C function definitions when using C++ */
  156. #ifdef __cplusplus
  157. }
  158. #endif
  159. #include "close_code.h"
  160.  
  161. #endif /* SDL_error_h_ */
  162.  
  163. /* vi: set ts=4 sw=4 expandtab: */
  164.