/*
 * header.c - read header line
 */

/*
 * Copyright (C) 2012 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 <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/stat.h>

#include "gawkapi.h"

#include "gettext.h"
#define _(msgid)  gettext(msgid)
#define N_(msgid) msgid

static awk_bool_t init_header();

static const gawk_api_t *api;	/* for convenience macros to work */
static awk_ext_id_t *ext_id;
static const char *ext_version = "create_variable extension: version 1.0";
static awk_bool_t (*init_func)(void) = NULL;

int plugin_is_GPL_compatible;

/*  do_ord --- return numeric value of first char of string */

static awk_value_t *
do_create_variable(int nargs, awk_value_t *result)
{
	int i;
	awk_value_t var_name;
	awk_value_t var_value;

	assert(result != NULL);
	make_number(0.0, result);

	if (nargs != 1 && nargs != 2) {
		fatal(ext_id,"create_variable: wrong number of arguments (%d)"\
			     " - should be 1 or 2",nargs);
	}

	/* look up variable whose name is passed in, should pass */
	if (!get_argument(0, AWK_STRING, &var_name)) {
		fatal(ext_id,"create_variable: failed to get variable name " \
				"(1st parameter)");
	}

	if (nargs==2) {
		get_argument(1, AWK_UNDEFINED, &var_value);

		if (var_name.val_type==AWK_UNDEFINED) {
			fatal(ext_id,"create_variable: failed to get variable value " \
				"(2nd parameter)");
		}
	} else {
		make_number(0.0, &var_value);
	}

	/* update the variable */
	if (!sym_update(var_name.str_value.str, &var_value)) {
			fatal(ext_id,"create_variable: failed to create/updated"\
				" variable (%s)", var_name.str_value);
	}

	make_number(1.0, result);
	return result;
}

static awk_value_t *
do_print_variable(int nargs, awk_value_t *result)
{
	int i;
	awk_value_t var_name;
	awk_value_t var_value;

	assert(result != NULL);
	make_number(0.0, result);

	if (nargs != 1)
		fatal(ext_id,"print_variable: wrong number of arguments (%d)"\
			     " - should be 1",nargs);

	/* look up variable whose name is passed in, should pass */
	if (!get_argument(0, AWK_STRING, &var_name)) {
		fatal(ext_id,"print_variable: failed to get variable name " \
				"(1st parameter)");
	}

	if (!sym_lookup(var_name.str_value.str,AWK_STRING, &var_value)) {
		fatal(ext_id,"print_variable: failed to get variable (%s) " \
		             " as a string", var_name.str_value.str);
	}

	fprintf(stderr,"variable(%s) = '%s'\n",
			var_name.str_value.str,
			var_value.str_value.str);

	make_number(1.0, result);
	return result;
}

static awk_ext_func_t func_table[] = {
	{ "create_variable", do_create_variable, 2 },
	{ "print_variable", do_print_variable, 1 }
};

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

dl_load_func(func_table, header, "");