1 files changed, 130 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..6888470ac
--- /dev/null
+++ b/nuttx/lib/unistd/lib_getcwd.c
@@ -0,0 +1,130 @@
+/****************************************************************************
+ * 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 */
+
+  if (!buf || !size)
+    {
+      errno = EINVAL;
+      return NULL;
+    }
+
+  /* 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)
+    {
+      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 */