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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

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    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/**** bitvec.h --- Bit vector manipulation.

 *

 ** Author: Steve Folkes <smf@hermes.mod.uk>

 *

 **** Commentary:

 *

 ***=== INTRODUCTION =========================================================

 *

 * This file specifies the interface to a single size bit vector manipulation

 * facility.  It is necessary to call the ``bitvec_set_size'' function to set

 * the size of these bit vectors, before any are actually created.

 *

 ***=== TYPES ================================================================

 *

 ** Type:	BitVecT

 ** Type:	BitVecP

 ** Repr:	<private>

 *

 * This is the bit vector type.

 *

 ***=== FUNCTIONS ============================================================

 *

 ** Function:	void			bitvec_set_size

 *			PROTO_S ((unsigned size))

 ** Exceptions:

 *

 * This function should be called once, before any bit vectors are

 * initialised.  Its argument should specify the number of bits in a bit

 * vector.  The bits will be numbered from zero to one less than the number

 * specified.

 *

 ** Function:	void			bitvec_init

 *			PROTO_S ((BitVecP bitvec))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function initialises the specified bit vector.  Initially, all bits

 * are zero.

 *

 ** Function:	void			bitvec_copy

 *			PROTO_S ((BitVecP to, BitVecP from))

 ** Exceptions:	XX_dalloc_no_memory

 *

 * This function initialises the to bit vector from the from bit vector.  It

 * is not necessary to have initialised the to bit vector with the

 * `bitvec_init' function previously.

 *

 ** Function:	void			bitvec_replace

 *			PROTO_S ((BitVecP to, BitVecP from))

 ** Exceptions:

 *

 * This function copies the from bit vector into the to bit vector.  The to

 * bit vector must have been initialised previously.

 *

 ** Function:	void			bitvec_empty

 *			PROTO_S ((BitVecP bitvec))

 ** Exceptions:

 *

 * This function sets all of the bits in the specified bit vector to zero.

 *

 ** Function:	BoolT			bitvec_is_empty

 *			PROTO_S ((BitVecP bitvec))

 ** Exceptions:

 *

 * This function returns true if all of the bits in the specified bit vector

 * are zero, and false otherwise.

 *

 ** Function:	BoolT			bitvec_is_full

 *			PROTO_S ((BitVecP bitvec))

 ** Exceptions:

 *

 * This function returns true if all of the bits in the specified bit vector

 * are set, and false otherwise.

 *

 ** Function:	void			bitvec_set

 *			PROTO_S ((BitVecP bitvec, unsigned bit))

 ** Exceptions:

 *

 * This function sets the specified bit in the specified bit vector to one.

 * Bits are numbered from zero.  If the bit is out of range, then the effect

 * of this function is undefined.

 *

 ** Function:	BoolT			bitvec_is_set

 *			PROTO_S ((BitVecP bitvec, unsigned bit))

 ** Exceptions:

 *

 * This function returns true if the specified bit in the specified bit vector

 * is set to one, and false otherwise.  Bits are numbered from zero.  If the

 * bit is out of range, the effect of this function is undefined.

 *

 ** Function:	void			bitvec_or

 *			PROTO_S ((BitVecP to, BitVecP from))

 ** Exceptions:

 *

 * This function performs an in-place bitwise or of the to bit vector and the

 * from bit vector, leaving the result in the to bit vector.

 *

 ** Function:	void			bitvec_and

 *			PROTO_S ((BitVecP to, BitVecPfrom))

 ** Exceptions:

 *

 * This function performs an in-place bitwise and of the to bit vector and the

 * from bit vector, leaving the result in the to bit vector.

 *

 ** Function:	void			bitvec_not

 *			PROTO_S ((BitVecP to))

 ** Exceptions:

 *

 * This function performs an in-place bitwise negation of the to bit vector.

 *

 ** Function:	BoolT			bitvec_equal

 *			PROTO_S ((BitVecP bitvec1, BitVecP bitvec2))

 ** Exceptions:

 *

 * This function returns true if both of the specified bit vectors are equal,

 * and false otherwise.

 *

 ** Function:	BoolT			bitvec_intersects

 *			PROTO_S ((BitVecP bitvec1, BitVecP bitvec2))

 ** Exceptions:

 *

 * This function returns true if the bitwise and of the specified bit vectors

 * contains at least one bit that is set to one, and false otherwise.

 *

 ** Function:	unsigned		bitvec_num_bits

 *			PROTO_S ((BitVecP bitvec))

 ** Exceptions:

 *

 * This function returns the number of bits in the bit vector that are set to

 * one.

 *

 ** Function:	unsigned		bitvec_first_bit

 *			PROTO_S ((BitVecP bitvec))

 ** Exceptions:

 *

 * This function returns the index of the first bit in the specified bit

 * vector that is set to one.

 *

 ** Function:	BoolT			bitvec_next_bit

 *			PROTO_S ((BitVecP bitvec, unsigned *next_ref))

 ** Exceptions:

 *

 * This function looks for the first bit set to one in the specified bit

 * vector with a higher index than that specified in the number pointed to by

 * next_ref.  If such a bit is found, then the index of that bit is written

 * back into next_ref, and the function returns true.  If no such bit is

 * found, then the function returns false.

 *

 ** Function:	void			bitvec_destroy

 *			PROTO_S ((BitVecP bitvec))

 ** Exceptions:

 *

 * This function destroys the specified bit vector.  After this, it should be

 * reinitialised before it is used.

 *

 ** Function:	void			write_bitvec_indices

 *			PROTO_S ((OStreamP ostream, BitVecP bitvec))

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function writes out to the specified ostream the indices of all bits

 * in the specified bit vector that are set to one.

 *

 **** Change log:

 * $Log: bitvec.h,v $

 * Revision 1.1.1.1  1998/01/17  15:57:45  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/15  09:57:01  smf

 * Brought into line with OSSG C Coding Standards Document, as per

 * "CR94_178.sid+tld-update".

 *

 * Revision 1.1.1.1  1994/07/25  16:05:47  smf

 * Initial import of library shared files.

 *

**/

/****************************************************************************/

#ifndef H_BITVEC

#define H_BITVEC

#include "os-interface.h"

#include "dalloc.h"

#include "ostream.h"

/*--------------------------------------------------------------------------*/

typedef struct BitVecT {

    ByteP		bits;

} BitVecT, *BitVecP;

/*--------------------------------------------------------------------------*/

extern void			bitvec_set_size

	PROTO_S ((unsigned));

extern void			bitvec_init

	PROTO_S ((BitVecP));

extern void			bitvec_copy

	PROTO_S ((BitVecP, BitVecP));

extern void			bitvec_replace

	PROTO_S ((BitVecP, BitVecP));

extern void			bitvec_empty

	PROTO_S ((BitVecP));

extern BoolT			bitvec_is_empty

	PROTO_S ((BitVecP));

extern BoolT			bitvec_is_full

	PROTO_S ((BitVecP));

extern void			bitvec_set

	PROTO_S ((BitVecP, unsigned));

extern BoolT			bitvec_is_set

	PROTO_S ((BitVecP, unsigned));

extern void			bitvec_or

	PROTO_S ((BitVecP, BitVecP));

extern void			bitvec_and

	PROTO_S ((BitVecP, BitVecP));

extern void			bitvec_not

	PROTO_S ((BitVecP));

extern BoolT			bitvec_equal

	PROTO_S ((BitVecP, BitVecP));

extern BoolT			bitvec_intersects

	PROTO_S ((BitVecP, BitVecP));

extern unsigned			bitvec_num_bits

	PROTO_S ((BitVecP));

extern unsigned			bitvec_first_bit

	PROTO_S ((BitVecP));

extern BoolT			bitvec_next_bit

	PROTO_S ((BitVecP, unsigned *));

extern void			bitvec_destroy

	PROTO_S ((BitVecP));

extern void			write_bitvec_indices

	PROTO_S ((OStreamP, BitVecP));

#endif /* !defined (H_BITVEC) */

/*

 * Local variables(smf):

 * eval: (include::add-path-entry "../os-interface" "../generated")

 * end:

**/