#ifndef _SYS_IOCCOM_H
#define _SYS_IOCCOM_H

// Linux-compatible ioctl command encoding constants — supplements the
// base _IOC / _IO / _IOR / _IOW / _IOWR macros from <sys/ioctl.h> with
// the bitfield widths, masks, shifts, decoders, and IOC direction
// macros that Linux UAPI headers (DRM, V4L2, etc.) expect.
//
// DRM headers include <sys/ioccom.h> as the BSD-naming path for ioctl
// command encoding; relibc's <sys/ioctl.h> provides the basic macros
// but not these constants. This header unifies them so DRM and other
// Linux UAPI consumers build without a Mesa-side stub.

#include <sys/ioctl.h>

#ifndef _IOC_NRBITS
#define _IOC_NRBITS    8
#endif
#ifndef _IOC_TYPEBITS
#define _IOC_TYPEBITS  8
#endif
#ifndef _IOC_SIZEBITS
#define _IOC_SIZEBITS  14
#endif
#ifndef _IOC_DIRBITS
#define _IOC_DIRBITS   2
#endif

#ifndef _IOC_NRMASK
#define _IOC_NRMASK    ((1 << _IOC_NRBITS) - 1)
#endif
#ifndef _IOC_TYPEMASK
#define _IOC_TYPEMASK  ((1 << _IOC_TYPEBITS) - 1)
#endif
#ifndef _IOC_SIZEMASK
#define _IOC_SIZEMASK  ((1 << _IOC_SIZEBITS) - 1)
#endif
#ifndef _IOC_DIRMASK
#define _IOC_DIRMASK   ((1 << _IOC_DIRBITS) - 1)
#endif

#ifndef _IOC_NRSHIFT
#define _IOC_NRSHIFT    0
#endif
#ifndef _IOC_TYPESHIFT
#define _IOC_TYPESHIFT  (_IOC_NRSHIFT + _IOC_NRBITS)
#endif
#ifndef _IOC_SIZESHIFT
#define _IOC_SIZESHIFT  (_IOC_TYPESHIFT + _IOC_TYPEBITS)
#endif
#ifndef _IOC_DIRSHIFT
#define _IOC_DIRSHIFT   (_IOC_SIZESHIFT + _IOC_SIZEBITS)
#endif

// _IOC_TYPECHECK wraps the ioctl size argument in a sizeof() for type
// safety. The musl/relibc _IOW / _IOR / _IOWR macros already call
// sizeof internally on the third argument; this macro is provided for
// callers that compose ioctl numbers directly (e.g. DRM).
#ifndef _IOC_TYPECHECK
#define _IOC_TYPECHECK(t) (sizeof(t))
#endif

// _IOC_DIR / _IOC_TYPE / _IOC_NR / _IOC_SIZE decode the fields of an
// ioctl number. Linux UAPI callers use these to inspect ioctls.
#ifndef _IOC_DIR
#define _IOC_DIR(nr)  (((nr) >> _IOC_DIRSHIFT)  & _IOC_DIRMASK)
#endif
#ifndef _IOC_TYPE
#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
#endif
#ifndef _IOC_NR
#define _IOC_NR(nr)   (((nr) >> _IOC_NRSHIFT)   & _IOC_NRMASK)
#endif
#ifndef _IOC_SIZE
#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
#endif

// IOC_IN / IOC_OUT / IOC_INOUT are the values stored in the direction
// field of an ioctl number when constructing one without _IO / _IOR /
// _IOW / _IOWR.
#ifndef IOC_IN
#define IOC_IN     (_IOC_WRITE  << _IOC_DIRSHIFT)
#endif
#ifndef IOC_OUT
#define IOC_OUT    (_IOC_READ   << _IOC_DIRSHIFT)
#endif
#ifndef IOC_INOUT
#define IOC_INOUT  ((_IOC_WRITE | _IOC_READ) << _IOC_DIRSHIFT)
#endif
#ifndef IOCSIZE_MASK
#define IOCSIZE_MASK  (_IOC_SIZEMASK << _IOC_SIZESHIFT)
#endif
#ifndef IOCSIZE_SHIFT
#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
#endif

#endif /* _SYS_IOCCOM_H */