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/* Pattern Matcher for Fixed String search.
Copyright (C) 1992, 1998, 2000, 2005 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 2, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
/* Specification. */
#include "libgrep.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "error.h"
#include "exitfail.h"
#include "xalloc.h"
#include "m-common.h"
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
# define IN_CTYPE_DOMAIN(c) 1
#else
# define IN_CTYPE_DOMAIN(c) isascii(c)
#endif
#define ISALNUM(C) (IN_CTYPE_DOMAIN (C) && isalnum (C))
static void *
Fcompile (const char *pattern, size_t pattern_size,
bool match_icase, bool match_words, bool match_lines,
char eolbyte)
{
struct compiled_kwset *ckwset;
const char *beg, *lim, *err;
ckwset = (struct compiled_kwset *) xmalloc (sizeof (struct compiled_kwset));
kwsinit (ckwset, match_icase, match_words, match_lines, eolbyte);
beg = pattern;
do
{
for (lim = beg; lim < pattern + pattern_size && *lim != '\n'; ++lim)
;
if ((err = kwsincr (ckwset->kwset, beg, lim - beg)) != NULL)
error (exit_failure, 0, err);
if (lim < pattern + pattern_size)
++lim;
beg = lim;
}
while (beg < pattern + pattern_size);
if ((err = kwsprep (ckwset->kwset)) != NULL)
error (exit_failure, 0, err);
return ckwset;
}
static size_t
Fexecute (const void *compiled_pattern, const char *buf, size_t buf_size,
size_t *match_size, bool exact)
{
struct compiled_kwset *ckwset = (struct compiled_kwset *) compiled_pattern;
register const char *beg, *try, *end;
register size_t len;
char eol = ckwset->eolbyte;
struct kwsmatch kwsmatch;
#ifdef MBS_SUPPORT
char *mb_properties;
if (MB_CUR_MAX > 1)
mb_properties = check_multibyte_string (buf, buf_size);
#endif /* MBS_SUPPORT */
for (beg = buf; beg <= buf + buf_size; ++beg)
{
size_t offset =
kwsexec (ckwset->kwset, beg, buf + buf_size - beg, &kwsmatch);
if (offset == (size_t) -1)
{
#ifdef MBS_SUPPORT
if (MB_CUR_MAX > 1)
free (mb_properties);
#endif /* MBS_SUPPORT */
return offset;
}
#ifdef MBS_SUPPORT
if (MB_CUR_MAX > 1 && mb_properties[offset+beg-buf] == 0)
continue; /* It is a part of multibyte character. */
#endif /* MBS_SUPPORT */
beg += offset;
len = kwsmatch.size[0];
if (exact)
{
*match_size = len;
#ifdef MBS_SUPPORT
if (MB_CUR_MAX > 1)
free (mb_properties);
#endif /* MBS_SUPPORT */
return beg - buf;
}
if (ckwset->match_lines)
{
if (beg > buf && beg[-1] != eol)
continue;
if (beg + len < buf + buf_size && beg[len] != eol)
continue;
goto success;
}
else if (ckwset->match_words)
for (try = beg; len; )
{
if (try > buf && IS_WORD_CONSTITUENT ((unsigned char) try[-1]))
break;
if (try + len < buf + buf_size
&& IS_WORD_CONSTITUENT ((unsigned char) try[len]))
{
offset = kwsexec (ckwset->kwset, beg, --len, &kwsmatch);
if (offset == (size_t) -1)
{
#ifdef MBS_SUPPORT
if (MB_CUR_MAX > 1)
free (mb_properties);
#endif /* MBS_SUPPORT */
return offset;
}
try = beg + offset;
len = kwsmatch.size[0];
}
else
goto success;
}
else
goto success;
}
#ifdef MBS_SUPPORT
if (MB_CUR_MAX > 1)
free (mb_properties);
#endif /* MBS_SUPPORT */
return -1;
success:
end = memchr (beg + len, eol, (buf + buf_size) - (beg + len));
end++;
while (buf < beg && beg[-1] != eol)
--beg;
*match_size = end - beg;
#ifdef MBS_SUPPORT
if (MB_CUR_MAX > 1)
free (mb_properties);
#endif /* MBS_SUPPORT */
return beg - buf;
}
static void
Ffree (void *compiled_pattern)
{
struct compiled_kwset *ckwset = (struct compiled_kwset *) compiled_pattern;
free (ckwset->trans);
free (ckwset);
}
matcher_t matcher_fgrep =
{
Fcompile,
Fexecute,
Ffree
};
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