//
//	aegis - project change supervisor
//	Copyright (C) 2005, 2006, 2008 Peter Miller
//
//	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 of the License, 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, see
//	<http://www.gnu.org/licenses/>.
//

#include <common/ac/stdlib.h>
#include <common/ac/string.h>

#include <libaegis/boolean.h>
#include <common/main.h>


nstring
bool_to_string(bool value)
{
    return (value ? "true" : "false");
}


bool
string_to_bool(const nstring &value, bool dflt)
{
    if (value.empty())
	return dflt;

    struct table_t
    {
	const char *name;
	bool value;
    };

    static const table_t table[] =
    {
	{ "false", false },
	{ "not", false },
	{ "true", true },
	{ "yes", true },
    };

    //
    // Look in the table for strings we understand.  We accept any
    // non-empty prefix (they are all distinct in the first character).
    //
    const char *cp = value.c_str();
    size_t len = value.length();
    for (const table_t *tp = table; tp < ENDOF(table); ++tp)
    {
	if (0 == strncasecmp(cp, tp->name, len))
	    return tp->value;
    }

    //
    // Try to turn it into a number, and if it evaluates to zero, it's
    // false (including words we don't know).
    //
    return !!atoi(value.c_str());
}