/*

 * fnmatch.c - Provide an interface to fnmatch(3) routine

 *

 * Arnold Robbins

 * arnold@skeeve.com

 * Written 7/2012

 */

/*

 * Copyright (C) 2012, 2013 the Free Software Foundation, Inc.

 *

 * This file is part of GAWK, the GNU implementation of the

 * AWK Programming Language.

 *

 * GAWK 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 of the License, or

 * (at your option) any later version.

 *

 * GAWK 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

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/stat.h>

#if HAVE_SYS_SYSMACROS_H

#include <sys/sysmacros.h>

#elif HAVE_SYS_MKDEV_H

#include <sys/mkdev.h>

#endif /* HAVE_SYS_MKDEV_H */

#include <sys/types.h>

#include "gawkapi.h"

#include "gettext.h"

#define _(msgid)  gettext(msgid)

#define N_(msgid) msgid

#ifdef __VMS

#define __iswctype iswctype

#define __btowc btowc

#endif

#define _GNU_SOURCE	1	/* use GNU extensions if they're there */

#ifdef HAVE_FNMATCH_H

#include <fnmatch.h>

#else

#ifdef __VMS

#include "fnmatch.h"	/* version that comes with gawk */

#else

#include "../missing_d/fnmatch.h"	/* version that comes with gawk */

#endif

#define HAVE_FNMATCH_H

#endif

#ifndef HAVE_FNMATCH

#ifdef __VMS

#include "fnmatch.c"	/* ditto */

#else

#include "../missing_d/fnmatch.c"	/* ditto */

#endif

#define HAVE_FNMATCH

#endif

/* Provide GNU extensions as no-ops if not defined */

#ifndef FNM_CASEFOLD

#define FNM_CASEFOLD	0

#endif

#ifndef FNM_LEADING_DIR

#define FNM_LEADING_DIR	0

#endif

#ifndef FNM_FILE_NAME

#define FNM_FILE_NAME	0

#endif

static const gawk_api_t *api;	/* for convenience macros to work */

static awk_ext_id_t ext_id;

static const char *ext_version = "fnmatch extension: version 1.0";

static awk_bool_t init_fnmatch(void);

static awk_bool_t (*init_func)(void) = init_fnmatch;

int plugin_is_GPL_compatible;

/* do_fnmatch --- implement the fnmatch interface */

static awk_value_t *

do_fnmatch(int nargs, awk_value_t *result, struct awk_ext_func *unused)

{

#ifdef HAVE_FNMATCH_H

	static int flags_mask =

		FNM_CASEFOLD    | FNM_FILE_NAME |

		FNM_LEADING_DIR | FNM_NOESCAPE |

		FNM_PATHNAME    | FNM_PERIOD ;

#endif

	awk_value_t pattern, string, flags;

	int int_flags, retval;

	make_number(-1.0, result);	/* default return */

#ifdef HAVE_FNMATCH

	if (! get_argument(0, AWK_STRING, & pattern)) {

		warning(ext_id, _("fnmatch: could not get first argument"));

		goto out;

	}

	if (! get_argument(1, AWK_STRING, & string)) {

		warning(ext_id, _("fnmatch: could not get second argument"));

		goto out;

	}

	if (! get_argument(2, AWK_NUMBER, & flags)) {

		warning(ext_id, _("fnmatch: could not get third argument"));

		goto out;

	}

	int_flags = flags.num_value;

	int_flags &= flags_mask;

	retval = fnmatch(pattern.str_value.str,

			string.str_value.str, int_flags);

	make_number((double) retval, result);

out:

#else

	fatal(ext_id, _("fnmatch is not implemented on this system\n"));

#endif

	return result;

}

#define ENTRY(x)	{ #x, FNM_##x }

static struct fnmflags {

	const char *name;

	int value;

} flagtable[] = {

	ENTRY(CASEFOLD),

	ENTRY(FILE_NAME),

	ENTRY(LEADING_DIR),

	ENTRY(NOESCAPE),

	ENTRY(PATHNAME),

	ENTRY(PERIOD),

	{ NULL, 0 }

};

/* init_fnmatch --- load array with flags */

static awk_bool_t

init_fnmatch(void)

{

	int errors = 0;

#ifdef HAVE_FNMATCH

	awk_value_t index, value, the_array;

	awk_array_t new_array;

	int i;

	if (! sym_update("FNM_NOMATCH", make_number(FNM_NOMATCH, & value))) {

		warning(ext_id, _("fnmatch init: could not add FNM_NOMATCH variable"));

		errors++;

	}

	new_array = create_array();

	for (i = 0; flagtable[i].name != NULL; i++) {

		(void) make_const_string(flagtable[i].name,

				strlen(flagtable[i].name), & index);

		(void) make_number(flagtable[i].value, & value);

		if (! set_array_element(new_array, & index, & value)) {

			warning(ext_id, _("fnmatch init: could not set array element %s"),

					flagtable[i].name);

			errors++;

		}

	}

	the_array.val_type = AWK_ARRAY;

	the_array.array_cookie = new_array;

	if (! sym_update("FNM", & the_array)) {

		warning(ext_id, _("fnmatch init: could not install FNM array"));

		errors++;

	}

#endif

	return errors == 0;

}

static awk_ext_func_t func_table[] = {

	{ "fnmatch", do_fnmatch, 3, 3, awk_false, NULL },

};

/* define the dl_load function using the boilerplate macro */

dl_load_func(func_table, fnmatch, "")