/*-
 * Copyright (c) 1992 Henry Spencer.
 * Copyright (c) 1992, 1993
 *		The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Henry Spencer of the University of Toronto.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *	  must display the following acknowledgement:
 *		This product includes software developed by the University of
 *		California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *	  may be used to endorse or promote products derived from this software
 *	  without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.	IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *		@(#)regex.h		8.2 (Berkeley) 1/3/94
 */

#ifndef _REGEX_H_
#define _REGEX_H_

#include <sys/types.h>
#include "mb/pg_wchar.h"

/* types */
typedef off_t regoff_t;

typedef struct
{
	int			re_magic;
	size_t		re_nsub;		/* number of parenthesized subexpressions */
	const pg_wchar *re_endp;	/* end pointer for REG_PEND */
	struct re_guts *re_g;		/* none of your business :-) */
	pg_wchar   *patsave;		/* me too :-) */
} regex_t;

typedef struct
{
	regoff_t	rm_so;			/* start of match */
	regoff_t	rm_eo;			/* end of match */
} regmatch_t;

/* regcomp() flags */
#define REG_BASIC		0000
#define REG_EXTENDED	0001
#define REG_ICASE		0002
#define REG_NOSUB		0004
#define REG_NEWLINE		0010
#define REG_NOSPEC		0020
#define REG_PEND		0040
#define REG_DUMP		0200

/* regerror() flags */
#define REG_NOMATCH		 1
#define REG_BADPAT		 2
#define REG_ECOLLATE	 3
#define REG_ECTYPE		 4
#define REG_EESCAPE		 5
#define REG_ESUBREG		 6
#define REG_EBRACK		 7
#define REG_EPAREN		 8
#define REG_EBRACE		 9
#define REG_BADBR		10
#define REG_ERANGE		11
#define REG_ESPACE		12
#define REG_BADRPT		13
#define REG_EMPTY		14
#define REG_ASSERT		15
#define REG_INVARG		16
#define REG_ATOI		255		/* convert name to number (!) */
#define REG_ITOA		0400	/* convert number to name (!) */

/* regexec() flags */
#define REG_NOTBOL		00001
#define REG_NOTEOL		00002
#define REG_STARTEND	00004
#define REG_TRACE		00400	/* tracing of execution */
#define REG_LARGE		01000	/* force large representation */
#define REG_BACKR		02000	/* force use of backref code */

extern int	pg_regcomp(regex_t *preg, const char *pattern, int cflags);
extern size_t pg_regerror(int errcode, const regex_t *preg,
			char *errbuf, size_t errbuf_size);
extern int pg_regexec(const regex_t *preg, const char *string,
		   size_t nmatch,
		   regmatch_t *pmatch, int eflags);
extern void pg_regfree(regex_t *preg);

#endif   /* !_REGEX_H_ */
