diff options
Diffstat (limited to 'nuttx/lib/unistd/lib_getcwd.c')
-rw-r--r-- | nuttx/lib/unistd/lib_getcwd.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/nuttx/lib/unistd/lib_getcwd.c b/nuttx/lib/unistd/lib_getcwd.c new file mode 100644 index 000000000..9bfa102fb --- /dev/null +++ b/nuttx/lib/unistd/lib_getcwd.c @@ -0,0 +1,132 @@ +/**************************************************************************** + * lib/unistd/lib_getcwd.c + * + * Copyright (C) 2008, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 + * COPYRIGHT OWNER 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/types.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> + +#include "lib_internal.h" + +#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON) + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: getwcd + * + * Description: + * getcwd() function places the absolute pathname of the current working + * directory in the array pointed to by 'buf', and returns 'buf.' The + * pathname copied to the array shall contain no components that are + * symbolic links. The 'size' argument is the size in bytes of the + * character array pointed to by the 'buf' argument. + * + * Input Parmeters: + * buf - a pointer to the location in which the current working directory + * pathaname is returned. + * size - The size in bytes avaiable at 'buf' + * + * Returned Value: + * Upon successful completion, getcwd() returns the 'buf' argument. + * Otherwise, getcwd() returns a null pointer and sets errno to indicate + * the error: + * + * EINVAL + * The 'size' argument is 0 or the 'buf' argument is NULL. + * ERANGE + * The size argument is greater than 0, but is smaller than the length + * of the currrent working directory pathname +1. + * EACCES + * Read or search permission was denied for a component of the pathname. + * ENOMEM + * Insufficient storage space is available. + * + ****************************************************************************/ + +FAR char *getcwd(FAR char *buf, size_t size) +{ + char *pwd; + + /* Verify input parameters */ + +#ifdef CONFIG_DEBUG + if (!buf || !size) + { + set_errno(EINVAL); + return NULL; + } +#endif + + /* If no working directory is defined, then default to the home directory */ + + pwd = getenv("PWD"); + if (!pwd) + { + pwd = CONFIG_LIB_HOMEDIR; + } + + /* Verify that the cwd will fit into the user-provided buffer */ + + if (strlen(pwd) + 1 > size) + { + set_errno(ERANGE); + return NULL; + } + + /* Copy the cwd to the user buffer */ + + strcpy(buf, pwd); + sched_unlock(); + return buf; +} +#endif /* CONFIG_NFILE_DESCRIPTORS && !CONFIG_DISABLE_ENVIRON */ |