/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
*          Copyright (c) 2020-2023 Contributors to ksh 93u+m           *
*                      and is licensed under the                       *
*                 Eclipse Public License, Version 2.0                  *
*                                                                      *
*                A copy of the License is available at                 *
*      https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html      *
*         (with md5 checksum 84283fa8859daf213bdda5a9f8d1be1d)         *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                  Martijn Dekker <martijn@inlv.org>                   *
*            Johnothan King <johnothanking@protonmail.com>             *
*                                                                      *
***********************************************************************/
/*
 * Glenn Fowler
 * AT&T Bell Laboratories
 *
 * convert a 0 terminated character constant string to an int
 */

#include <ast.h>

int
chrtoi(const char* s)
{
	int	c;
	int	x;
	size_t	n;
	char*	p;

	c = 0;
	for (n = 0; n < sizeof(int) * CHAR_BIT; n += CHAR_BIT)
	{
		switch (x = *((unsigned char*)s++))
		{
		case '\\':
			x = chresc(s - 1, &p);
			s = (const char*)p;
			break;
		case 0:
			return c;
		}
		c = (c << CHAR_BIT) | x;
	}
	return c;
}
