/* search.c - searching subroutines using dfa, kwset and regex for grep.

   Copyright 1992, 1998, 2000, 2007, 2009-2017 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#ifndef GREP_SEARCH_H

#define GREP_SEARCH_H 1

#include <config.h>

#include <sys/types.h>

#include <stdint.h>

#include <wchar.h>

#include <wctype.h>

#include <regex.h>

#include "system.h"

#include "grep.h"

#include "dfa.h"

#include "kwset.h"

#include "xalloc.h"

#include "localeinfo.h"

_GL_INLINE_HEADER_BEGIN

#ifndef SEARCH_INLINE

# define SEARCH_INLINE _GL_INLINE

#endif

/* This must be a signed type.  Each value is the difference in the size

   of a character (in bytes) induced by converting to lower case.

   The vast majority of values are 0, but a few are 1 or -1, so

   technically, two bits may be sufficient.  */

typedef signed char mb_len_map_t;

/* searchutils.c */

extern void wordinit (void);

extern kwset_t kwsinit (bool);

extern size_t wordchars_size (char const *, char const *) _GL_ATTRIBUTE_PURE;

extern size_t wordchar_next (char const *, char const *) _GL_ATTRIBUTE_PURE;

extern size_t wordchar_prev (char const *, char const *, char const *)

  _GL_ATTRIBUTE_PURE;

extern ptrdiff_t mb_goback (char const **, char const *, char const *);

/* dfasearch.c */

extern void *GEAcompile (char *, size_t, reg_syntax_t);

extern size_t EGexecute (void *, char const *, size_t, size_t *, char const *);

/* kwsearch.c */

extern void *Fcompile (char *, size_t, reg_syntax_t);

extern size_t Fexecute (void *, char const *, size_t, size_t *, char const *);

/* pcresearch.c */

extern void *Pcompile (char *, size_t, reg_syntax_t);

extern size_t Pexecute (void *, char const *, size_t, size_t *, char const *);

/* grep.c */

extern struct localeinfo localeinfo;

extern void fgrep_to_grep_pattern (char **, size_t *);

/* Return the number of bytes in the character at the start of S, which

   is of size N.  N must be positive.  MBS is the conversion state.

   This acts like mbrlen, except it returns 1 when mbrlen would return 0,

   and it is typically faster because of the cache.  */

SEARCH_INLINE size_t

mb_clen (char const *s, size_t n, mbstate_t *mbs)

{

  size_t len = localeinfo.sbclen[to_uchar (*s)];

  return len == (size_t) -2 ? mbrlen (s, n, mbs) : len;

}

_GL_INLINE_HEADER_END

#endif /* GREP_SEARCH_H */