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+/****************************************************************************
+ * apps/nshlib/nsh_envcmds.c
+ *
+ * Copyright (C) 2007-2009, 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <libgen.h>
+#include <errno.h>
+
+#include "nsh.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+static const char g_pwd[] = "PWD";
+static const char g_oldpwd[] = "OLDPWD";
+static const char g_home[] = CONFIG_LIB_HOMEDIR;
+#endif
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nsh_getwd
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+static inline FAR const char *nsh_getwd(const char *wd)
+{
+ const char *val;
+
+ /* If no working directory is defined, then default to the home directory */
+
+ val = getenv(wd);
+ if (!val)
+ {
+ val = g_home;
+ }
+ return val;
+}
+#endif
+
+/****************************************************************************
+ * Name: nsh_getdirpath
+ ****************************************************************************/
+
+static inline char *nsh_getdirpath(FAR struct nsh_vtbl_s *vtbl,
+ const char *dirpath, const char *relpath)
+{
+ char *alloc;
+ int len;
+
+ /* Handle the special case where the dirpath is simply */
+
+ if (strcmp(dirpath, "/") == 0)
+ {
+ len = strlen(relpath) + 2;
+ alloc = (char*)malloc(len);
+ if (alloc)
+ {
+ sprintf(alloc, "/%s", relpath);
+ }
+ }
+ else
+ {
+ len = strlen(dirpath) + strlen(relpath) + 2;
+ alloc = (char*)malloc(len);
+ if (alloc)
+ {
+ sprintf(alloc, "%s/%s", dirpath, relpath);
+ }
+ }
+
+ if (!alloc)
+ {
+ nsh_output(vtbl, g_fmtcmdoutofmemory, "nsh_getdirpath");
+ }
+ return alloc;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nsh_getwd
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+FAR const char *nsh_getcwd(void)
+{
+ return nsh_getwd(g_pwd);
+}
+#endif
+/****************************************************************************
+ * Name: nsh_getfullpath
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+char *nsh_getfullpath(FAR struct nsh_vtbl_s *vtbl, const char *relpath)
+{
+ const char *wd;
+
+ /* Handle some special cases */
+
+ if (!relpath || relpath[0] == '\0')
+ {
+ /* No relative path provided */
+
+ return strdup(g_home);
+ }
+ else if (relpath[0] == '/')
+ {
+ return strdup(relpath);
+ }
+
+ /* Get the path to the current working directory */
+
+ wd = nsh_getcwd();
+
+ /* Fake the '.' directory */
+
+ if (strcmp(relpath, ".") == 0)
+ {
+ return strdup(wd);
+ }
+
+ /* Return the full path */
+
+ return nsh_getdirpath(vtbl, wd, relpath);
+}
+#endif
+
+/****************************************************************************
+ * Name: nsh_freefullpath
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+void nsh_freefullpath(char *relpath)
+{
+ if (relpath)
+ {
+ free(relpath);
+ }
+}
+#endif
+
+/****************************************************************************
+ * Name: cmd_cd
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+#ifndef CONFIG_EXAMPLES_NSH_DISABLE_CD
+int cmd_cd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
+{
+ const char *path = argv[1];
+ char *alloc = NULL;
+ char *fullpath = NULL;
+ int ret = OK;
+
+ /* Check for special arguments */
+
+ if (argc < 2 || strcmp(path, "~") == 0)
+ {
+ path = g_home;
+ }
+ else if (strcmp(path, "-") == 0)
+ {
+ alloc = strdup(nsh_getwd(g_oldpwd));
+ path = alloc;
+ }
+ else if (strcmp(path, "..") == 0)
+ {
+ alloc = strdup(nsh_getcwd());
+ path = dirname(alloc);
+ }
+ else
+ {
+ fullpath = nsh_getfullpath(vtbl, path);
+ path = fullpath;
+ }
+
+ /* Set the new workding directory */
+
+ if (chdir(path) != 0)
+ {
+ nsh_output(vtbl, g_fmtcmdfailed, argv[0], "chdir", NSH_ERRNO);
+ ret = ERROR;
+ }
+
+ /* Free any memory that was allocated */
+
+ if (alloc)
+ {
+ free(alloc);
+ }
+
+ if (fullpath)
+ {
+ nsh_freefullpath(fullpath);
+ }
+ return ret;
+}
+#endif
+#endif
+
+/****************************************************************************
+ * Name: cmd_echo
+ ****************************************************************************/
+
+#ifndef CONFIG_EXAMPLES_NSH_DISABLE_ECHO
+int cmd_echo(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
+{
+ int i;
+
+ /* echo each argument, separated by a space as it must have been on the
+ * command line
+ */
+
+ for (i = 1; i < argc; i++)
+ {
+ nsh_output(vtbl, "%s ", argv[i]);
+ }
+ nsh_output(vtbl, "\n");
+ return OK;
+}
+#endif
+
+/****************************************************************************
+ * Name: cmd_pwd
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
+#ifndef CONFIG_EXAMPLES_NSH_DISABLE_PWD
+int cmd_pwd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
+{
+ nsh_output(vtbl, "%s\n", nsh_getcwd());
+ return OK;
+}
+#endif
+#endif
+
+/****************************************************************************
+ * Name: cmd_set
+ ****************************************************************************/
+
+#ifndef CONFIG_DISABLE_ENVIRON
+#ifndef CONFIG_EXAMPLES_NSH_DISABLE_SET
+int cmd_set(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
+{
+ int ret = setenv(argv[1], argv[2], TRUE);
+ if (ret < 0)
+ {
+ nsh_output(vtbl, g_fmtcmdfailed, argv[0], "setenv", NSH_ERRNO);
+ }
+ return ret;
+}
+#endif
+#endif
+
+/****************************************************************************
+ * Name: cmd_unset
+ ****************************************************************************/
+
+#ifndef CONFIG_DISABLE_ENVIRON
+#ifndef CONFIG_EXAMPLES_NSH_DISABLE_UNSET
+int cmd_unset(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
+{
+ int ret = unsetenv(argv[1]);
+ if (ret < 0)
+ {
+ nsh_output(vtbl, g_fmtcmdfailed, argv[0], "unsetenv", NSH_ERRNO);
+ }
+ return ret;
+}
+#endif
+#endif
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