/*******************************************************************
*                                                                  *
*             This software is part of the ast package             *
*                Copyright (c) 1985-2004 AT&T Corp.                *
*        and it may only be used by you under license from         *
*                       AT&T Corp. ("AT&T")                        *
*         A copy of the Source Code Agreement is available         *
*                at the AT&T Internet web site URL                 *
*                                                                  *
*       http://www.research.att.com/sw/license/ast-open.html       *
*                                                                  *
*    If you have copied or used this software without agreeing     *
*        to the terms of the license you are infringing on         *
*           the license and copyright and are violating            *
*               AT&T's intellectual property rights.               *
*                                                                  *
*            Information and Software Systems Research             *
*                        AT&T Labs Research                        *
*                         Florham Park NJ                          *
*                                                                  *
*               Glenn Fowler <gsf@research.att.com>                *
*                David Korn <dgk@research.att.com>                 *
*                 Phong Vo <kpv@research.att.com>                  *
*                                                                  *
*******************************************************************/
#pragma prototyped
/*
 * resolvepath implementation
 */

#include <ast.h>
#include <error.h>

#if defined(__EXPORT__)
#define extern	__EXPORT__
#endif

extern char*
resolvepath(const char* file, char* path, size_t size)
{
	register char*	s;
	register int	n;
	register int	r;

	r = *file != '/';
	n = strlen(file) + r + 1;
	if (n >= size)
	{
#ifdef ENAMETOOLONG
		errno = ENAMETOOLONG;
#else
		errno = ENOMEM;
#endif
		return 0;
	}
	if (!r)
		s = path;
	else if (!getcwd(path, size - n))
		return 0;
	else
	{
		s = path + strlen(path);
		*s++ = '/';
	}
	strcpy(s, file);
	return pathcanon(path, PATH_PHYSICAL|PATH_DOTDOT|PATH_EXISTS) ? path : (char*)0;
}
