94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
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/****************************************************************************
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* libs/libc/misc/lib_getfullpath.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_getfullpath
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*
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* Description:
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* Given the directory path from dirfd.
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*
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****************************************************************************/
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int lib_getfullpath(int dirfd, FAR const char *path, FAR char *fullpath)
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{
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if (path == NULL || fullpath == NULL)
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{
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return -EINVAL;
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}
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else if (path[0] == '/')
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{
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/* The path is absolute, then dirfd is ignored. */
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strlcpy(fullpath, path, PATH_MAX);
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return 0;
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}
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if (dirfd == AT_FDCWD)
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{
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/* The dirfd is the special value AT_FDCWD, then pathname is
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* interpreted relative to the current working directory of the
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* calling process.
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*/
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FAR char *pwd = "";
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#ifndef CONFIG_DISABLE_ENVIRON
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pwd = getenv("PWD");
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if (pwd == NULL)
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{
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pwd = CONFIG_LIBC_HOMEDIR;
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}
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#endif
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sprintf(fullpath, "%s/%s", pwd, path);
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return 0;
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}
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else
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{
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int ret;
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/* Get real directory path by dirfd */
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ret = fcntl(dirfd, F_GETPATH, fullpath);
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if (ret >= 0)
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{
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strlcat(fullpath, path, PATH_MAX);
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}
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return 0;
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}
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}
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