fs26fseek.c

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#ifdef FSS_FTR
#define ACCESS_RIGHTS_INTERNAL_FS
#define FS26FSEEK_C

#undef  FILE_NUMBER
#define FILE_NUMBER 26 

#include "Fs.h"

#undef PROCEDURE_NUMBER 
#define PROCEDURE_NUMBER 1

void Fs26_01FSeek ( void * pp_Param )
{
   register t_FsCmdFSeek * pl_Param = ( t_FsCmdFSeek * ) pp_Param;

   register t_fsFILE * pl_Stream = pl_Param->p_Stream;

   register s32 vl_NewPosition;
   register s32 vl_BasePosition;


/* #ifdef FS_DEBUG  */
    /* Verify if  vp_Stream point on a stream if not OK enter an exception */
    MC_FS_CO_VERIFY_IF_IS_FILE_OF_ENTITY( pl_Param, pl_Stream );
    if ( MC_FS_STATUS(pl_Param) != FS_OK ) return;
/* #endif */



    /* Note that an operation was executed on the stream */
    pl_Stream->v_OperationExecuted = 1;

    /* Determine base of the position */
    switch (pl_Param->v_Whence)
    {
	case FS_SEEK_SET:  vl_BasePosition = 0; 
	     break;

	case FS_SEEK_CUR:  vl_BasePosition =  pl_Stream->v_FilePosition;
	     break;

	case FS_SEEK_END: vl_BasePosition =  pl_Stream->v_FileSize;
	     break;

	/* Error return */
	default:
	   {
		/* Err unknow whence -> invalid argument */
		MC_FS_STATUS(pl_Param) = FS_EINVAL;
		return ;
	   }
    }

    /* Set the interlayer table pointer */
    MC_FS_LL_SET_NEW_VOL(MC_FS_VD_GET_VOL_PTR_OF_FILE( pl_Stream ));

    /* Calculate new position */
    vl_NewPosition =  vl_BasePosition + pl_Param->v_Offset;

    /* Verify if position not out of file */
    if ( ( vl_NewPosition < 0 ) || (vl_NewPosition > pl_Stream->v_FileSize) )
    {
	/* Err invalid argument */
	MC_FS_STATUS(pl_Param) = FS_EINVAL;
	return ;
    }

    /* Updates file position */
    pl_Stream->v_FilePosition = vl_NewPosition;

    /* If file can be readen  and writen modify file state to READ_WRITE */
    if ( ( pl_Stream->s_OpenMode.v_WriteEnabled == TRUE ) 
				&& 
	 ( pl_Stream->s_OpenMode.v_ReadEnabled == TRUE ) 
       )
    	pl_Stream->v_StreamState = FS_SSTATE_READ_OR_WRITE;

    /* Update IO buffer content from file */
    MC_FS_BF_UPDATE_IO_BUFF_FROM_FILE( pl_Stream, vl_NewPosition );
}



#undef PROCEDURE_NUMBER 
#define PROCEDURE_NUMBER 2

u32 Fs26_02ProcessFSeek(u8 vp_Behaviour, t_fsFILE * pp_Stream, s32 vp_Offset, s32 vp_Whence )
{
   /* Reserve message space */
   t_FsCmdFSeek * pl_FSeek = (t_FsCmdFSeek * ) MC_FS_GET_MEMORY(sizeof(t_FsCmdFSeek));

    /* Fill message with input parameters */
    pl_FSeek->p_Stream = pp_Stream;
    pl_FSeek->v_Offset = vp_Offset;
    pl_FSeek->v_Whence = vp_Whence;

    /* Send message by setting operation and return command identifier */
    return( MC_FS_MA_SEND_CMD_MSG_TO_FS(vp_Behaviour, (void*)pl_FSeek,FS_CMD_FSEEK_REQ ));
}


#endif /* FSS_FTR */