/*

 * This file has been modified for the cdrkit suite.

 *

 * The behaviour and appearence of the program code below can differ to a major

 * extent from the version distributed by the original author(s).

 *

 * For details, see Changelog file distributed with the cdrkit package. If you

 * received this file from another source then ask the distributing person for

 * a log of modifications.

 *

 */

/* @(#)astoll.c	1.3 03/06/15 Copyright 1985, 2000-2003 J. Schilling */

/*

 *	astoll() converts a string to long long

 *

 *	Leading tabs and spaces are ignored.

 *	Both return pointer to the first char that has not been used.

 *	Caller must check if this means a bad conversion.

 *

 *	leading "+" is ignored

 *	leading "0"  makes conversion octal (base 8)

 *	leading "0x" makes conversion hex   (base 16)

 *

 *	Llong is silently reverted to long if the compiler does not

 *	support long long.

 *

 *	Copyright (c) 1985, 2000-2003 J. Schilling

 */

/*

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

 * it under the terms of the GNU General Public License version 2

 * as published by the Free Software Foundation.

 *

 * 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; see the file COPYING.  If not, write to the Free Software

 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 */

#include <mconfig.h>

#include <standard.h>

#include <utypes.h>

#include <schily.h>

#define	is_space(c)	 ((c) == ' ' || (c) == '\t')

#define	is_digit(c)	 ((c) >= '0' && (c) <= '9')

#define	is_hex(c)	(\

			((c) >= 'a' && (c) <= 'f') || \

			((c) >= 'A' && (c) <= 'F'))

#define	to_lower(c)	(((c) >= 'A' && (c) <= 'Z') ? (c) - 'A'+'a' : (c))

char *

astoll(s, l)

	register const char *s;

	Llong *l;

{

	return (astollb(s, l, 0));

}

char *

astollb(s, l, base)

	register const char *s;

	Llong *l;

	register int base;

{

	int neg = 0;

	register Llong ret = (Llong)0;

	register int digit;

	register char c;

	while (is_space(*s))

		s++;

	if (*s == '+') {

		s++;

	} else if (*s == '-') {

		s++;

		neg++;

	}

	if (base == 0) {

		if (*s == '0') {

			base = 8;

			s++;

			if (*s == 'x' || *s == 'X') {

				s++;

				base = 16;

			}

		} else {

			base = 10;

		}

	}

	for (; (c = *s) != 0; s++) {

		if (is_digit(c)) {

			digit = c - '0';

		} else if (is_hex(c)) {

			digit = to_lower(c) - 'a' + 10;

		} else {

			break;

		}

		if (digit < base) {

			ret *= base;

			ret += digit;

		} else {

			break;

		}

	}

	if (neg)

		ret = -ret;

	*l = ret;

	return ((char *)s);

}