/*
 * Copyright 2013, Olivier Coursière, olivier.coursiere@laposte.net.
 * Copyright 2009, Axel Dörfler, axeld@pinc-software.de.
 * Distributed under the terms of the MIT License.
 */


#include <stdlib.h>

#include <errno.h>
#include <sys/stat.h>

#include <errno_private.h>
#include <syscalls.h>


char*
realpath(const char* path, char* resolved)
{
        char* resolvedPath = resolved;

        if (resolvedPath == NULL) {
                resolvedPath = (char*)malloc(PATH_MAX + 1);
                if (resolvedPath == NULL) {
                        __set_errno(B_NO_MEMORY);
                        return NULL;
                }
        }

        status_t status = _kern_normalize_path(path, true, resolvedPath);
        if (status != B_OK) {
                __set_errno(status);
                if (resolved == NULL)
                        free(resolvedPath);
                return NULL;
        }

        // The path must actually exist, not just its parent directories
        struct stat stat;
        if (lstat(resolvedPath, &stat) != 0) {
                if (resolved == NULL)
                        free(resolvedPath);
                return NULL;
        }

        return resolvedPath;
}