private bool Sys_Lseek()
{
// get fd index
UInt64 fd_index = RBX;
if (fd_index >= (UInt64)FDCount)
{
Terminate(ErrorCode.OutOfBounds); return(false);
}
// get fd
IFileWrapper fd = FileDescriptors[fd_index];
if (fd == null)
{
Terminate(ErrorCode.FDNotInUse); return(false);
}
// make sure it can seek
if (!fd.CanSeek())
{
Terminate(ErrorCode.FilePermissions); return(false);
}
int raw_mode = (int)RDX;
SeekOrigin seek_origin;
// process raw mode
if (raw_mode == (int)SeekMode.set)
{
seek_origin = SeekOrigin.Begin;
}
else if (raw_mode == (int)SeekMode.cur)
{
seek_origin = SeekOrigin.Current;
}
else if (raw_mode == (int)SeekMode.end)
{
seek_origin = SeekOrigin.End;
}
// otherwise unknown seek mode - return -1
else
{
RAX = ~(UInt64)0; return(true);
}
// attempt the seek
try { RAX = (UInt64)fd.Seek((Int64)RCX, seek_origin); }
catch (Exception) { RAX = ~(UInt64)0; }
return(true);
}