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nuttx-apps/nshlib/nsh_envcmds.c

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/****************************************************************************
* apps/nshlib/nsh_envcmds.c
*
* Copyright (C) 2007-2009, 2011-2012, 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <ctype.h>
#include <libgen.h>
#include <errno.h>
#include "nsh.h"
#include "nsh_console.h"
/****************************************************************************
* 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
/****************************************************************************
* 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 == NULL)
{
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)
FAR char *nsh_getfullpath(FAR struct nsh_vtbl_s *vtbl,
FAR 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(FAR char *fullpath)
{
if (fullpath)
{
free(fullpath);
}
}
#endif
/****************************************************************************
* Name: cmd_cd
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
#ifndef CONFIG_NSH_DISABLE_CD
int cmd_cd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
FAR const char *path = argv[1];
FAR char *alloc = NULL;
FAR 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 working directory */
ret = chdir(path);
if (ret != 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_NSH_DISABLE_ECHO
int cmd_echo(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
int i;
int s = 1;
if (argc > 1 && 0 == strncmp(argv[1], "-n", 2))
{
s = 2;
}
/* echo each argument, separated by a space as it must have been on the
* command line.
*/
for (i = s; i < argc; i++)
{
if (i != s)
{
nsh_output(vtbl, " ");
}
nsh_output(vtbl, "%s", argv[i]);
}
if (1 == s)
{
nsh_output(vtbl, "\n");
}
return OK;
}
#endif
/****************************************************************************
* Name: cmd_env
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_ENV
int cmd_env(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
return nsh_catfile(vtbl, argv[0],
CONFIG_NSH_PROC_MOUNTPOINT "/self/group/env");
}
#endif
/****************************************************************************
* Name: cmd_pwd
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
#ifndef CONFIG_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_NSH_DISABLE_SET
int cmd_set(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
FAR char *value;
int ret = OK;
#ifdef NSH_HAVE_VARS
int ndx = 1;
#endif
#ifndef CONFIG_NSH_DISABLESCRIPT
FAR char *popt;
const char opts[] = NSH_NP_SET_OPTIONS;
int op;
/* REVISIT: set with no arguments should show all of the NSH variables */
#ifdef NSH_HAVE_VARS
/* Support set [{+|-}{e|x|xe|ex}] [<name> <value>] */
if (argc == 2 || argc == 4)
#else
/* Support set [{+|-}{e|x|xe|ex}] */
#endif
{
if (strlen(argv[1]) < 2)
{
ret = -EINVAL;
nsh_output(vtbl, g_fmtargrequired, argv[0], "set", NSH_ERRNO);
}
else
{
op = argv[1][0];
if (op != '-' && op != '+')
{
ret = -EINVAL;
nsh_output(vtbl, g_fmtarginvalid, argv[0], "set", NSH_ERRNO);
}
else
{
value = &argv[1][1];
while(*value && *value != ' ')
{
popt = strchr(opts, *value++);
if (popt == NULL)
{
nsh_output(vtbl, g_fmtarginvalid, argv[0], "set", NSH_ERRNO);
ret = -EINVAL;
break;
}
if (op == '+')
{
vtbl->np.np_flags |= 1 << (popt-opts);
}
else
{
vtbl->np.np_flags &= ~(1 << (popt-opts));
}
}
#ifdef NSH_HAVE_VARS
if (ret == OK)
{
ndx = 2;
}
#endif
}
}
}
#ifdef NSH_HAVE_VARS
if (ret == OK && (argc == 3 || argc == 4))
#endif
#endif /* CONFIG_NSH_DISABLESCRIPT */
#ifdef NSH_HAVE_VARS
{
#if defined(CONFIG_NSH_VARS) && !defined(CONFIG_DISABLE_ENVIRON)
FAR char *oldvalue;
#endif
/* Trim whitespace from the value */
value = nsh_trimspaces(argv[ndx+1]);
#ifdef CONFIG_NSH_VARS
#ifndef CONFIG_DISABLE_ENVIRON
/* Check if the NSH variable has already been promoted to an group-
* wide environment variable.
*/
oldvalue = getenv(argv[ndx]);
if (oldvalue == NULL)
#endif
{
/* Set the NSH variable */
ret = nsh_setvar(vtbl, argv[ndx], value);
if (ret < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "nsh_setvar",
NSH_ERRNO_OF(-ret));
}
}
#endif /* CONFIG_NSH_VARS */
#if !defined(CONFIG_DISABLE_ENVIRON)
#ifdef CONFIG_NSH_VARS
else
#endif
{
/* Set the environment variable */
ret = setenv(argv[ndx], value, TRUE);
if (ret < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "setenv",
NSH_ERRNO);
}
}
#endif /* !CONFIG_DISABLE_ENVIRON */
}
#endif /* NSH_HAVE_VARS */
return ret;
}
#endif /* CONFIG_NSH_DISABLE_SET */
/****************************************************************************
* Name: cmd_unset
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_UNSET
int cmd_unset(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
int status;
int ret = OK;
#if defined(CONFIG_NSH_VARS)
/* Unset NSH variable */
status = nsh_unsetvar(vtbl, argv[1]);
if (status < 0 && status != -ENOENT)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "nsh_unsetvar",
NSH_ERRNO_OF(-status));
ret = ERROR;
}
#endif
#if !defined(CONFIG_DISABLE_ENVIRON)
/* Unset environment variable */
status = unsetenv(argv[1]);
if (status < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "unsetenv", NSH_ERRNO);
ret = ERROR;
}
#endif
return ret;
}
#endif
/****************************************************************************
* Name: cmd_export
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_EXPORT
int cmd_export(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
FAR const char *value = "";
int status;
int ret = OK;
/* Get the value from the command line if provided. argc may be either 2
* or 3
*/
if (argc == 3)
{
value = argv[2];
}
else
{
FAR const char *tmp;
/* Try to get the value from the NSH variable */
tmp = nsh_getvar(vtbl, argv[1]);
if (tmp != NULL)
{
value = tmp;
}
}
/* Set the environment variable to the selected value */
status = setenv(argv[1], value, TRUE);
if (status < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "unsetenv", NSH_ERRNO);
ret = ERROR;
}
else
{
/* Unset NSH variable */
status = nsh_unsetvar(vtbl, argv[1]);
if (status < 0 && status != -ENOENT)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "nsh_unsetvar",
NSH_ERRNO_OF(-status));
ret = ERROR;
}
}
return ret;
}
#endif
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