/*

 * Copyright (c) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru>

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. The names of the authors may not be used to endorse or promote

 *    products derived from this software without specific prior written

 *    permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * Portions Copyright (c) 2006-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 

 */

#if defined(LIBC_SCCS) && !defined(lint)

static char sccsid[] = "@(#)realpath.c	8.1 (Berkeley) 2/16/94";

#endif /* LIBC_SCCS and not lint */

#include <sys/cdefs.h>

__FBSDID("$FreeBSD: src/lib/libc/stdlib/realpath.c,v 1.20 2003/05/28 08:23:01 fjoe Exp $");

#include "namespace.h"

#include <sys/param.h>

#include <sys/stat.h>

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "un-namespace.h"

/*

 * char *realpath(const char *path, char resolved[PATH_MAX]);

 *

 * Find the real name of path, by removing all ".", ".." and symlink

 * components.  Returns (resolved) on success, or (NULL) on failure,

 * in which case the path which caused trouble is left in (resolved).

 */

EXPORT_C

char *

realpath(const char *path, char resolved[PATH_MAX])

{

	struct stat sb;

	char *p, *q, *s;

	size_t left_len, resolved_len;

	unsigned symlinks;

	int serrno, slen;

	char left[PATH_MAX], next_token[PATH_MAX], symlink[PATH_MAX] = "";

	char slash;

	char linux_flag = 'f';

	char *holder;

/*	#ifdef __SYMBIAN32__

	slash = '\\';

	#else

	slash = '/';

	#endif //__SYMBIAN32__

*/

	if(path == NULL || resolved == NULL) { //invalid arguments

		errno = EINVAL;

		return (NULL);

	}

	if(strchr(path,'/') != NULL) 

		{

		linux_flag = 't';

		slash = '/';

		}

	else

		{

		slash = '\\';

		}

	serrno = errno;

	symlinks = 0;

	if (path[0] == slash) {

		resolved[0] = slash;

		resolved[1] = '\0';

		if (path[1] == '\0')

			return (resolved);

		resolved_len = 1;

		left_len = strlcpy(left, path + 1, sizeof(left));

	}

	#ifdef __SYMBIAN32__

	else if (path[1] == ':' && path[2] == slash) {

		resolved[0] = path[0];

		resolved[1] = path[1];

		resolved[2] = path[2];

		resolved[3] = '\0';

		if (path[3] == '\0')

			return (resolved);

		resolved_len = 3;

		left_len = strlcpy(left, path + 3, sizeof(left));

	}

	#endif //__SYMBIAN32__

	else {

		if (getcwd(resolved, PATH_MAX) == NULL) {

			strlcpy(resolved, ".", PATH_MAX);

			return (NULL);

		}

		/*for converting to symbian style to unix style slash*/

		if(linux_flag == 't' )

			{

			holder = resolved;

			while((holder = strchr(holder,'\\')) != NULL)

				{

				*holder = '/';	

				++holder;

				}

			}

		resolved_len = strlen(resolved);

		left_len = strlcpy(left, path, sizeof(left));

	}

	if (left_len >= sizeof(left) || resolved_len >= PATH_MAX) {

		errno = ENAMETOOLONG;

		return (NULL);

	}

	/*

	 * Iterate over path components in `left'.

	 */

	while (left_len != 0) {

		/*

		 * Extract the next path component and adjust `left'

		 * and its length.

		 */

		p = strchr(left, slash);

		s = p ? p : left + left_len;

		if (s - left >= sizeof(next_token)) {

			errno = ENAMETOOLONG;

			return (NULL);

		}

		memcpy(next_token, left, s - left);

		next_token[s - left] = '\0';

		left_len -= s - left;

		if (p != NULL)

			memmove(left, s + 1, left_len + 1);

		if (resolved[resolved_len - 1] != slash) {

			if (resolved_len + 1 >= PATH_MAX) {

				errno = ENAMETOOLONG;

				return (NULL);

			}

			resolved[resolved_len++] = slash;

			resolved[resolved_len] = '\0';

		}

		if (next_token[0] == '\0')

			continue;

		else if (strcmp(next_token, ".") == 0)

			continue;

		else if (strcmp(next_token, "..") == 0) {

			/*

			 * Strip the last path component except when we have

			 * single "/"

			 */

			if (resolved_len > 1) {

				resolved[resolved_len - 1] = '\0';

				//q = strrchr(resolved, slash) + 1; 

				q = strrchr(resolved, slash);

				if(q == NULL)

					{

						resolved[resolved_len - 1] = slash;

						resolved[resolved_len] = '\0';

						continue;					

					}					

				q += 1;

				*q = '\0';

				resolved_len = q - resolved;

			}

			continue;

		}

		/*

		 * Append the next path component and lstat() it. If

		 * lstat() fails we still can return successfully if

		 * there are no more path components left.

		 */

		#ifdef __SYMBIAN32__

		if ((strncasecmp(resolved, next_token, 2) == 0) && resolved[1] == ':')

			continue;

		#endif //__SYMBIAN32__

		resolved_len = strlcat(resolved, next_token, PATH_MAX);

		if (resolved_len >= PATH_MAX) {

			errno = ENAMETOOLONG;

			return (NULL);

		}

		if (lstat(resolved, &sb) != 0) {

			if (errno == ENOENT && p == NULL) {

				errno = serrno;

				return (resolved);

			}

			return (NULL);

		}

		if (S_ISLNK(sb.st_mode)) {

			if (symlinks++ > MAXSYMLINKS) {

				errno = ELOOP;

				return (NULL);

			}

			slen = readlink(resolved, symlink, sizeof(symlink) - 1);

			if (slen < 0)

				return (NULL);

			symlink[slen] = '\0';

			if (symlink[0] == slash) {

				resolved[1] = 0;

				resolved_len = 1;

			}

			else if (resolved_len > 1) {

				/* Strip the last path component. */

				resolved[resolved_len - 1] = '\0';

				q = strrchr(resolved, slash) + 1;

				*q = '\0';

				resolved_len = q - resolved;

			}

			/*

			 * If there are any path components left, then

			 * append them to symlink. The result is placed

			 * in `left'.

			 */

			if (p != NULL) {

				if (symlink[slen - 1] != slash) {

					if (slen + 1 >= sizeof(symlink)) {

						errno = ENAMETOOLONG;

						return (NULL);

					}

					symlink[slen] = slash;

					symlink[slen + 1] = 0;

				}

				left_len = strlcat(symlink, left, sizeof(left));

				if (left_len >= sizeof(left)) {

					errno = ENAMETOOLONG;

					return (NULL);

				}

			}

			left_len = strlcpy(left, symlink, sizeof(left));

			/*for converting to symbian style to unix style slash*/

			if(linux_flag == 't' )

				{

				holder = left;

				while((holder = strchr(holder,'\\')) != NULL)

					{

					*holder = '/';	

					++holder;

					}

				}

		}

	}

	/*

	 * Remove trailing slash except when the resolved pathname

	 * is a single "/".

	 */

	if (resolved_len > 1 && resolved[resolved_len - 1] == slash)

		resolved[resolved_len - 1] = '\0';

	return (resolved);

}