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nuttx-apps/nshlib/nsh_parse.c

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/****************************************************************************
* apps/nshlib/nsh_parse.c
*
* Copyright (C) 2007-2013, 2014 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 <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#ifdef CONFIG_NSH_CMDPARMS
# include <sys/stat.h>
#endif
#include <nuttx/version.h>
#include <apps/nsh.h>
#include "nsh.h"
#include "nsh_console.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* If CONFIG_NSH_CMDPARMS or CONFIG_NSH_ARGCAT is enabled, then we will need
* retain a list of memory allocations to be freed at the completion of
* command processing.
*/
#undef HAVE_MEMLIST
#if defined(CONFIG_NSH_CMDPARMS) || defined(CONFIG_NSH_ARGCAT)
# define HAVE_MEMLIST 1
#endif
#if defined(HAVE_MEMLIST) && !defined(CONFIG_NSH_MAXALLOCS)
# ifdef CONFIG_NSH_ARGCAT
# define CONFIG_NSH_MAXALLOCS (2*CONFIG_NSH_MAXARGUMENTS)
# else
# define CONFIG_NSH_MAXALLOCS CONFIG_NSH_MAXARGUMENTS
# endif
#endif
/* Allocation list helper macros */
#ifdef HAVE_MEMLIST
# define NSH_MEMLIST_TYPE struct nsh_memlist_s
# define NSH_MEMLIST_INIT(m) memset(&(m), 0, sizeof(struct nsh_memlist_s));
# define NSH_MEMLIST_ADD(m,a) nsh_memlist_add(m,a)
# define NSH_MEMLIST_FREE(m) nsh_memlist_free(m)
#else
# define NSH_MEMLIST_TYPE uint8_t
# define NSH_MEMLIST_INIT(m) do { (m) = 0; } while (0)
# define NSH_MEMLIST_ADD(m,a)
# define NSH_MEMLIST_FREE(m)
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* These structure describes the parsed command line */
#ifndef CONFIG_NSH_DISABLEBG
struct cmdarg_s
{
FAR struct nsh_vtbl_s *vtbl; /* For front-end interaction */
int fd; /* FD for output redirection */
int argc; /* Number of arguments in argv */
FAR char *argv[MAX_ARGV_ENTRIES]; /* Argument list */
};
#endif
/* This structure describes the allocation list */
#ifdef HAVE_MEMLIST
struct nsh_memlist_s
{
int nallocs; /* Number of allocations */
FAR char *allocations[CONFIG_NSH_MAXALLOCS];
};
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#ifdef HAVE_MEMLIST
static void nsh_memlist_add(FAR struct nsh_memlist_s *memlist,
FAR char *allocation);
static void nsh_memlist_free(FAR struct nsh_memlist_s *memlist);
#endif
#ifndef CONFIG_NSH_DISABLEBG
static void nsh_releaseargs(struct cmdarg_s *arg);
static pthread_addr_t nsh_child(pthread_addr_t arg);
static struct cmdarg_s *nsh_cloneargs(FAR struct nsh_vtbl_s *vtbl,
int fd, int argc, char *argv[]);
#endif
static int nsh_saveresult(FAR struct nsh_vtbl_s *vtbl, bool result);
static int nsh_execute(FAR struct nsh_vtbl_s *vtbl,
int argc, FAR char *argv[], FAR const char *redirfile,
int oflags);
#ifdef CONFIG_NSH_CMDPARMS
static FAR char *nsh_filecat(FAR struct nsh_vtbl_s *vtbl, FAR char *s1,
FAR const char *filename);
static FAR char *nsh_cmdparm(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
FAR char **allocation);
#endif
#ifdef CONFIG_NSH_ARGCAT
static FAR char *nsh_strcat(FAR struct nsh_vtbl_s *vtbl, FAR char *s1,
FAR const char *s2);
#endif
#ifndef CONFIG_DISABLE_ENVIRON
static FAR char *nsh_envexpand(FAR struct nsh_vtbl_s *vtbl,
FAR char *varname);
#endif
static FAR char *nsh_argexpand(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
FAR char **allocation);
static FAR char *nsh_argument(FAR struct nsh_vtbl_s *vtbl, char **saveptr,
FAR NSH_MEMLIST_TYPE *memlist);
#ifndef CONFIG_NSH_DISABLESCRIPT
#ifndef CONFIG_NSH_DISABLE_LOOPS
static bool nsh_loop_enabled(FAR struct nsh_vtbl_s *vtbl);
#endif
#ifndef CONFIG_NSH_DISABLE_ITEF
static bool nsh_itef_enabled(FAR struct nsh_vtbl_s *vtbl);
#endif
static bool nsh_cmdenabled(FAR struct nsh_vtbl_s *vtbl);
#ifndef CONFIG_NSH_DISABLE_LOOPS
static int nsh_loop(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist);
#endif
#ifndef CONFIG_NSH_DISABLE_ITEF
static int nsh_itef(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist);
#endif
#endif
#ifndef CONFIG_NSH_DISABLEBG
static int nsh_nice(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist);
#endif
#ifdef CONFIG_NSH_CMDPARMS
static int nsh_parse_cmdparm(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
FAR const char *redirfile);
#endif
static int nsh_parse_command(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline);
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_token_separator[] = " \t\n";
#ifndef NSH_DISABLE_SEMICOLON
static const char g_line_separator[] = "\"#;\n";
#endif
#ifdef CONFIG_NSH_ARGCAT
static const char g_arg_separator[] = "`$";
#endif
static const char g_redirect1[] = ">";
static const char g_redirect2[] = ">>";
#ifndef CONFIG_DISABLE_ENVIRON
static const char g_exitstatus[] = "?";
#endif
static const char g_success[] = "0";
static const char g_failure[] = "1";
static const char g_nullstring[] = "";
/****************************************************************************
* Public Data
****************************************************************************/
/* If NuttX versioning information is available, Include that information
* in the NSH greeting.
*/
#if CONFIG_VERSION_MAJOR != 0 || CONFIG_VERSION_MINOR != 0
const char g_nshgreeting[] = "\nNuttShell (NSH) NuttX-" CONFIG_VERSION_STRING "\n";
#else
const char g_nshgreeting[] = "\nNuttShell (NSH)\n";
#endif
/* Fixed Message of the Day (MOTD) */
#if defined(CONFIG_NSH_MOTD) && !defined(CONFIG_NSH_PLATFORM_MOTD)
const char g_nshmotd[] = CONFIG_NSH_MOTD_STRING;
#endif
/* Telnet login prompts */
#ifdef CONFIG_NSH_LOGIN
#if defined(CONFIG_NSH_TELNET_LOGIN) && defined(CONFIG_NSH_TELNET)
const char g_telnetgreeting[] = "\nWelcome to NuttShell(NSH) Telnet Server...\n";
#endif
const char g_userprompt[] = "login: ";
const char g_passwordprompt[] = "password: ";
const char g_loginsuccess[] = "\nUser Logged-in!\n";
const char g_badcredentials[] = "\nInvalid username or password\n";
const char g_loginfailure[] = "Login failed!\n";
#endif
/* The NSH prompt */
const char g_nshprompt[] = "nsh> ";
/* Common, message formats */
const char g_fmtsyntax[] = "nsh: %s: syntax error\n";
const char g_fmtargrequired[] = "nsh: %s: missing required argument(s)\n";
const char g_fmtnomatching[] = "nsh: %s: no matching %s\n";
const char g_fmtarginvalid[] = "nsh: %s: argument invalid\n";
const char g_fmtargrange[] = "nsh: %s: value out of range\n";
const char g_fmtcmdnotfound[] = "nsh: %s: command not found\n";
const char g_fmtnosuch[] = "nsh: %s: no such %s: %s\n";
const char g_fmttoomanyargs[] = "nsh: %s: too many arguments\n";
const char g_fmtdeepnesting[] = "nsh: %s: nesting too deep\n";
const char g_fmtcontext[] = "nsh: %s: not valid in this context\n";
#ifdef CONFIG_NSH_STRERROR
const char g_fmtcmdfailed[] = "nsh: %s: %s failed: %s\n";
#else
const char g_fmtcmdfailed[] = "nsh: %s: %s failed: %d\n";
#endif
const char g_fmtcmdoutofmemory[] = "nsh: %s: out of memory\n";
const char g_fmtinternalerror[] = "nsh: %s: Internal error\n";
#ifndef CONFIG_DISABLE_SIGNALS
const char g_fmtsignalrecvd[] = "nsh: %s: Interrupted by signal\n";
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_memlist_add
****************************************************************************/
#ifdef HAVE_MEMLIST
static void nsh_memlist_add(FAR struct nsh_memlist_s *memlist,
FAR char *allocation)
{
if (memlist && allocation)
{
int index = memlist->nallocs;
if (index < CONFIG_NSH_MAXALLOCS)
{
memlist->allocations[index] = allocation;
memlist->nallocs = index + 1;
}
}
}
#endif
/****************************************************************************
* Name: nsh_memlist_free
****************************************************************************/
#ifdef HAVE_MEMLIST
static void nsh_memlist_free(FAR struct nsh_memlist_s *memlist)
{
if (memlist)
{
int index;
for (index = 0; index < memlist->nallocs; index++)
{
free(memlist->allocations[index]);
memlist->allocations[index] = NULL;
}
memlist->nallocs = 0;
}
}
#endif
/****************************************************************************
* Name: nsh_releaseargs
****************************************************************************/
#ifndef CONFIG_NSH_DISABLEBG
static void nsh_releaseargs(struct cmdarg_s *arg)
{
FAR struct nsh_vtbl_s *vtbl = arg->vtbl;
int i;
#if CONFIG_NFILE_STREAMS > 0
/* If the output was redirected, then file descriptor should
* be closed. The created task has its one, independent copy of
* the file descriptor
*/
if (vtbl->np.np_redirect)
{
(void)close(arg->fd);
}
#endif
/* Released the cloned vtbl instance */
nsh_release(vtbl);
/* Release the cloned args */
for (i = 0; i < arg->argc; i++)
{
free(arg->argv[i]);
}
free(arg);
}
#endif
/****************************************************************************
* Name: nsh_child
****************************************************************************/
#ifndef CONFIG_NSH_DISABLEBG
static pthread_addr_t nsh_child(pthread_addr_t arg)
{
struct cmdarg_s *carg = (struct cmdarg_s *)arg;
int ret;
dbg("BG %s\n", carg->argv[0]);
/* Execute the specified command on the child thread */
ret = nsh_command(carg->vtbl, carg->argc, carg->argv);
/* Released the cloned arguments */
dbg("BG %s complete\n", carg->argv[0]);
nsh_releaseargs(carg);
return (pthread_addr_t)((uintptr_t)ret);
}
#endif
/****************************************************************************
* Name: nsh_cloneargs
****************************************************************************/
#ifndef CONFIG_NSH_DISABLEBG
static struct cmdarg_s *nsh_cloneargs(FAR struct nsh_vtbl_s *vtbl,
int fd, int argc, char *argv[])
{
struct cmdarg_s *ret = (struct cmdarg_s *)zalloc(sizeof(struct cmdarg_s));
int i;
if (ret)
{
ret->vtbl = vtbl;
ret->fd = fd;
ret->argc = argc;
for (i = 0; i < argc; i++)
{
ret->argv[i] = strdup(argv[i]);
}
}
return ret;
}
#endif
/****************************************************************************
* Name: nsh_saveresult
****************************************************************************/
static int nsh_saveresult(FAR struct nsh_vtbl_s *vtbl, bool result)
{
struct nsh_parser_s *np = &vtbl->np;
#ifndef CONFIG_NSH_DISABLESCRIPT
#ifndef CONFIG_NSH_DISABLE_LOOPS
/* Check if we are waiting for the condition associated with a while
* token.
*
* while <test-cmd>; do <cmd-sequence>; done
*
* Execute <cmd-sequence> as long as <test-cmd> has an exit status of
* zero.
*/
if (np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_WHILE)
{
np->np_fail = false;
np->np_lpstate[np->np_lpndx].lp_enable = (result == OK);
return OK;
}
/* Check if we are waiting for the condition associated with an until
* token.
*
* until <test-cmd>; do <cmd-sequence>; done
*
* Execute <cmd-sequence> as long as <test-cmd> has a non-zero exit
* status.
*/
else if (np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_UNTIL)
{
np->np_fail = false;
np->np_lpstate[np->np_lpndx].lp_enable = (result != OK);
return OK;
}
else
#endif
#ifndef CONFIG_NSH_DISABLE_ITEF
/* Check if we are waiting for the condition associated with an if token */
if (np->np_iestate[np->np_iendx].ie_state == NSH_ITEF_IF)
{
np->np_fail = false;
np->np_iestate[np->np_iendx].ie_ifcond = result;
return OK;
}
else
#endif
#endif
{
np->np_fail = result;
return result ? ERROR : OK;
}
}
/****************************************************************************
* Name: nsh_execute
****************************************************************************/
static int nsh_execute(FAR struct nsh_vtbl_s *vtbl,
int argc, FAR char *argv[],
FAR const char *redirfile, int oflags)
{
#if CONFIG_NFILE_STREAMS > 0 || !defined(CONFIG_NSH_DISABLEBG)
int fd = -1;
#endif
int ret;
/* Does this command correspond to an application filename?
* nsh_fileapp() returns:
*
* -1 (ERROR) if the application task corresponding to 'argv[0]' could not
* be started (possibly because it does not exist).
* 0 (OK) if the application task corresponding to 'argv[0]' was
* and successfully started. If CONFIG_SCHED_WAITPID is
* defined, this return value also indicates that the
* application returned successful status (EXIT_SUCCESS)
* 1 If CONFIG_SCHED_WAITPID is defined, then this return value
* indicates that the application task was spawned successfully
* but returned failure exit status.
*
* Note the priority is not effected by nice-ness.
*/
#ifdef CONFIG_NSH_FILE_APPS
ret = nsh_fileapp(vtbl, argv[0], argv, redirfile, oflags);
if (ret >= 0)
{
/* nsh_fileapp() returned 0 or 1. This means that the built-in
* command was successfully started (although it may not have ran
* successfully). So certainly it is not an NSH command.
*/
/* Save the result: success if 0; failure if 1 */
return nsh_saveresult(vtbl, ret != OK);
}
/* No, not a file name command (or, at least, we were unable to start a
* program of that name). Maybe it is a built-in application or an NSH
* command.
*/
#endif
/* Does this command correspond to a built-in command?
* nsh_builtin() returns:
*
* -1 (ERROR) if the application task corresponding to 'argv[0]' could not
* be started (possibly because it doesn not exist).
* 0 (OK) if the application task corresponding to 'argv[0]' was
* and successfully started. If CONFIG_SCHED_WAITPID is
* defined, this return value also indicates that the
* application returned successful status (EXIT_SUCCESS)
* 1 If CONFIG_SCHED_WAITPID is defined, then this return value
* indicates that the application task was spawned successfully
* but returned failure exit status.
*
* Note the priority if not effected by nice-ness.
*/
#if defined(CONFIG_NSH_BUILTIN_APPS) && (!defined(CONFIG_NSH_FILE_APPS) || !defined(CONFIG_FS_BINFS))
#if CONFIG_NFILE_STREAMS > 0
ret = nsh_builtin(vtbl, argv[0], argv, redirfile, oflags);
#else
ret = nsh_builtin(vtbl, argv[0], argv, NULL, 0);
#endif
if (ret >= 0)
{
/* nsh_builtin() returned 0 or 1. This means that the built-in
* command was successfully started (although it may not have ran
* successfully). So certainly it is not an NSH command.
*/
/* Save the result: success if 0; failure if 1 */
return nsh_saveresult(vtbl, ret != OK);
}
/* No, not a built in command (or, at least, we were unable to start a
* built-in command of that name). Treat it like an NSH command.
*/
#endif
#if CONFIG_NFILE_STREAMS > 0
/* Redirected output? */
if (vtbl->np.np_redirect)
{
/* Open the redirection file. This file will eventually
* be closed by a call to either nsh_release (if the command
* is executed in the background) or by nsh_undirect if the
* command is executed in the foreground.
*/
fd = open(redirfile, oflags, 0666);
if (fd < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "open", NSH_ERRNO);
goto errout;
}
}
#endif
/* Handle the case where the command is executed in background.
* However is app is to be started as built-in new process will
* be created anyway, so skip this step.
*/
#ifndef CONFIG_NSH_DISABLEBG
if (vtbl->np.np_bg)
{
struct sched_param param;
struct nsh_vtbl_s *bkgvtbl;
struct cmdarg_s *args;
pthread_attr_t attr;
pthread_t thread;
/* Get a cloned copy of the vtbl with reference count=1.
* after the command has been processed, the nsh_release() call
* at the end of nsh_child() will destroy the clone.
*/
bkgvtbl = nsh_clone(vtbl);
if (!bkgvtbl)
{
goto errout_with_redirect;
}
/* Create a container for the command arguments */
args = nsh_cloneargs(bkgvtbl, fd, argc, argv);
if (!args)
{
nsh_release(bkgvtbl);
goto errout_with_redirect;
}
#if CONFIG_NFILE_STREAMS > 0
/* Handle redirection of output via a file descriptor */
if (vtbl->np.np_redirect)
{
(void)nsh_redirect(bkgvtbl, fd, NULL);
}
#endif
/* Get the execution priority of this task */
ret = sched_getparam(0, &param);
if (ret != 0)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "sched_getparm", NSH_ERRNO);
nsh_releaseargs(args);
nsh_release(bkgvtbl);
goto errout;
}
/* Determine the priority to execute the command */
if (vtbl->np.np_nice != 0)
{
int priority = param.sched_priority - vtbl->np.np_nice;
if (vtbl->np.np_nice < 0)
{
int max_priority = sched_get_priority_max(SCHED_NSH);
if (priority > max_priority)
{
priority = max_priority;
}
}
else
{
int min_priority = sched_get_priority_min(SCHED_NSH);
if (priority < min_priority)
{
priority = min_priority;
}
}
param.sched_priority = priority;
}
/* Set up the thread attributes */
(void)pthread_attr_init(&attr);
(void)pthread_attr_setschedpolicy(&attr, SCHED_NSH);
(void)pthread_attr_setschedparam(&attr, &param);
/* Execute the command as a separate thread at the appropriate priority */
ret = pthread_create(&thread, &attr, nsh_child, (pthread_addr_t)args);
if (ret != 0)
{
nsh_output(vtbl, g_fmtcmdfailed, argv[0], "pthread_create", NSH_ERRNO_OF(ret));
nsh_releaseargs(args);
nsh_release(bkgvtbl);
goto errout;
}
/* Detach from the pthread since we are not going to join with it.
* Otherwise, we would have a memory leak.
*/
(void)pthread_detach(thread);
nsh_output(vtbl, "%s [%d:%d]\n", argv[0], thread, param.sched_priority);
}
else
#endif
{
#if CONFIG_NFILE_STREAMS > 0
uint8_t save[SAVE_SIZE];
/* Handle redirection of output via a file descriptor */
if (vtbl->np.np_redirect)
{
nsh_redirect(vtbl, fd, save);
}
#endif
/* Then execute the command in "foreground" -- i.e., while the user waits
* for the next prompt. nsh_command will return:
*
* -1 (ERRROR) if the command was unsuccessful
* 0 (OK) if the command was successful
*/
ret = nsh_command(vtbl, argc, argv);
#if CONFIG_NFILE_STREAMS > 0
/* Restore the original output. Undirect will close the redirection
* file descriptor.
*/
if (vtbl->np.np_redirect)
{
nsh_undirect(vtbl, save);
}
#endif
/* Mark errors so that it is possible to test for non-zero return values
* in nsh scripts.
*/
if (ret < 0)
{
goto errout;
}
}
/* Return success if the command succeeded (or at least, starting of the
* command task succeeded).
*/
return nsh_saveresult(vtbl, false);
#ifndef CONFIG_NSH_DISABLEBG
errout_with_redirect:
#if CONFIG_NFILE_STREAMS > 0
if (vtbl->np.np_redirect)
{
close(fd);
}
#endif
#endif
errout:
return nsh_saveresult(vtbl, true);
}
/****************************************************************************
* Name: nsh_filecat
****************************************************************************/
#ifdef CONFIG_NSH_CMDPARMS
static FAR char *nsh_filecat(FAR struct nsh_vtbl_s *vtbl, FAR char *s1,
FAR const char *filename)
{
struct stat buf;
size_t s1size = 0;
size_t allocsize;
ssize_t nbytesread;
FAR char *argument;
int index;
int fd;
int ret;
/* Get the size of the string */
if (s1)
{
s1size = (size_t)strlen(s1);
}
/* Get the size of file */
ret = stat(filename, &buf);
if (ret != 0)
{
nsh_output(vtbl, g_fmtcmdfailed, "``", "stat", NSH_ERRNO);
return NULL;
}
/* Get the total allocation size */
allocsize = s1size + (size_t)buf.st_size + 1;
argument = (FAR char *)realloc(s1, allocsize);
if (!argument)
{
nsh_output(vtbl, g_fmtcmdoutofmemory, "``");
return NULL;
}
/* Open the source file for reading */
fd = open(filename, O_RDONLY);
if (fd < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, "``", "open", NSH_ERRNO);
goto errout_with_alloc;
}
/* Now copy the file. Loop until the entire file has been transferred to
* the allocated string (after the original contents of s1size bytes.
*/
for (index = s1size; index < allocsize - 1; )
{
/* Loop until we successfully read something , we encounter the
* end-of-file, or until a read error occurs
*/
do
{
nbytesread = read(fd, &argument[index], IOBUFFERSIZE);
if (nbytesread == 0)
{
/* Unexpected end of file -- Break out of the loop */
break;
}
else if (nbytesread < 0)
{
/* EINTR is not an error (but will still stop the copy) */
#ifndef CONFIG_DISABLE_SIGNALS
if (errno == EINTR)
{
nsh_output(vtbl, g_fmtsignalrecvd, "``");
}
else
#endif
{
/* Read error */
nsh_output(vtbl, g_fmtcmdfailed, "``", "read", NSH_ERRNO);
}
goto errout_with_fd;
}
}
while (nbytesread <= 0);
/* Update the index based upon the number of bytes read */
index += nbytesread;
}
/* Make sure that the new string is null terminated */
argument[index] = '\0';
/* Close the temporary file and return the concatenated value */
close (fd);
return argument;
errout_with_fd:
close(fd);
errout_with_alloc:
free(argument);
return NULL;
}
#endif
/****************************************************************************
* Name: nsh_cmdparm
****************************************************************************/
#ifdef CONFIG_NSH_CMDPARMS
static FAR char *nsh_cmdparm(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
FAR char **allocation)
{
FAR char *tmpfile;
FAR char *argument;
int ret;
/* We cannot process the command argument if there is no allocation pointer */
if (!allocation)
{
return (FAR char *)g_nullstring;
}
/* Create a unique file name using the task ID */
tmpfile = NULL;
ret = asprintf(&tmpfile, "%s/TMP%d.dat", CONFIG_LIBC_TMPDIR, getpid());
if (ret < 0 || !tmpfile)
{
nsh_output(vtbl, g_fmtcmdoutofmemory, "``");
return (FAR char *)g_nullstring;
}
/* Execute the command that will re-direct the output of the command to
* the temporary file. This is a simple command that can't handle most
* options.
*/
ret = nsh_parse_cmdparm(vtbl, cmdline, tmpfile);
if (ret != OK)
{
/* Report the failure */
nsh_output(vtbl, g_fmtcmdfailed, "``", "exec", NSH_ERRNO);
free(tmpfile);
return (FAR char *)g_nullstring;
}
/* Concatenate the file contents with the current allocation */
argument = nsh_filecat(vtbl, *allocation, tmpfile);
*allocation = argument;
/* We can now unlink the tmpfile and free the tmpfile string */
ret = unlink(tmpfile);
if (ret < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, "``", "unlink", NSH_ERRNO);
}
free(tmpfile);
return argument;
}
#endif
/****************************************************************************
* Name: nsh_strcat
****************************************************************************/
#ifdef CONFIG_NSH_ARGCAT
static FAR char *nsh_strcat(FAR struct nsh_vtbl_s *vtbl, FAR char *s1,
FAR const char *s2)
{
FAR char *argument;
int s1size = 0;
int allocsize;
/* Get the size of the first string... it might be NULL */
if (s1)
{
s1size = strlen(s1);
}
/* Then reallocate the first string so that it is large enough to hold
* both (including the NUL terminator).
*/
allocsize = s1size + strlen(s2) + 1;
argument = (FAR char *)realloc(s1, allocsize);
if (!argument)
{
nsh_output(vtbl, g_fmtcmdoutofmemory, "$");
argument = s1;
}
else
{
argument[s1size] = '\0'; /* (In case s1 was NULL) */
strcat(argument, s2);
}
return argument;
}
#endif
/****************************************************************************
* Name: nsh_envexpand
****************************************************************************/
#ifndef CONFIG_DISABLE_ENVIRON
static FAR char *nsh_envexpand(FAR struct nsh_vtbl_s *vtbl,
FAR char *varname)
{
/* Check for built-in variables */
if (strcmp(varname, g_exitstatus) == 0)
{
if (vtbl->np.np_fail)
{
return (FAR char *)g_failure;
}
else
{
return (FAR char *)g_success;
}
}
/* Not a built-in? Return the value of the environment variable with this
* name.
*/
else
{
FAR char *value = getenv(varname);
if (value)
{
return value;
}
else
{
return (FAR char *)g_nullstring;
}
}
}
#endif
/****************************************************************************
* Name: nsh_argexpand
****************************************************************************/
#if defined(CONFIG_NSH_ARGCAT) && defined(HAVE_MEMLIST)
static FAR char *nsh_argexpand(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
FAR char **allocation)
{
FAR char *working = cmdline;
FAR char *argument = NULL;
FAR char *ptr;
size_t len;
/* Loop until all of the commands on the command line have been processed */
for (;;)
{
/* Look for interesting things within the command string. */
len = strcspn(working, g_arg_separator);
ptr = working + len;
/* If ptr points to the NUL terminator, then there is nothing else
* interesting in the argument.
*/
if (*ptr == '\0')
{
/* Was anything previously concatenated? */
if (argument)
{
/* Yes, then we probably need to add the last part of the argument
* beginning at the last working pointer to the concatenated
* argument.
*
* On failures to allocation memory, nsh_strcat will just return
* value value of argument
*/
argument = nsh_strcat(vtbl, argument, working);
*allocation = argument;
return argument;
}
else
{
/* No.. just return the original string from the command line. */
return cmdline;
}
}
else
#ifdef CONFIG_NSH_CMDPARMS
/* Check for a backquoted command embedded within the argument string. */
if (*ptr == '`')
{
FAR char *tmpalloc = NULL;
FAR char *result;
FAR char *rptr;
/* Replace the backquote with a NUL terminator and add the
* intervening character to the concatenated string.
*/
*ptr++ = '\0';
argument = nsh_strcat(vtbl, argument, working);
*allocation = argument;
/* Find the closing backquote */
rptr = strchr(ptr, '`');
if (!rptr)
{
nsh_output(vtbl, g_fmtnomatching, "`", "`");
return (FAR char *)g_nullstring;
}
/* Replace the final backquote with a NUL terminator */
*rptr = '\0';
/* Then execute the command to get the sub-string value. On
* error, nsh_cmdparm may return g_nullstring but never NULL.
*/
result = nsh_cmdparm(vtbl, ptr, &tmpalloc);
/* Concatenate the result of the operation with the accumulated
* string. On failures to allocation memory, nsh_strcat will
* just return value value of argument
*/
argument = nsh_strcat(vtbl, argument, result);
*allocation = argument;
working = rptr + 1;
/* And free any temporary allocations */
if (tmpalloc)
{
free(tmpalloc);
}
}
else
#endif
#ifndef CONFIG_DISABLE_ENVIRON
/* Check if we encountered a reference to an environment variable */
if (*ptr == '$')
{
FAR char *envstr;
FAR char *rptr;
/* Replace the dollar sign with a NUL terminator and add the
* intervening character to the concatenated string.
*/
*ptr++ = '\0';
argument = nsh_strcat(vtbl, argument, working);
*allocation = argument;
/* Find the end of the environment variable reference. If the
* dollar sign ('$') is followed by a right bracket ('{') then the
* variable name is terminated with the left bracket character
* ('}'). Otherwise, the variable name goes to the end of the
* argument.
*/
if (*ptr == '{')
{
/* Skip over the left bracket */
ptr++;
/* Find the closing right bracket */
rptr = strchr(ptr, '}');
if (!rptr)
{
nsh_output(vtbl, g_fmtnomatching, "${", "}");
return (FAR char *)g_nullstring;
}
/* Replace the right bracket with a NUL terminator and set the
* working pointer to the character after the bracket.
*/
*rptr = '\0';
working = rptr + 1;
}
else
{
/* Set working to the NUL terminator at the end of the string */
working = ptr + strlen(ptr);
}
/* Then get the value of the environment variable. On errors,
* nsh_envexpand will return the NULL string.
*/
envstr = nsh_envexpand(vtbl, ptr);
/* Concatenate the result of the operation with the accumulated
* string. On failures to allocation memory, nsh_strcat will
* just return value value of argument
*/
argument = nsh_strcat(vtbl, argument, envstr);
*allocation = argument;
}
else
#endif
{
/* Just to catch any dangling else clauses */
}
}
}
#else
static FAR char *nsh_argexpand(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
FAR char **allocation)
{
FAR char *argument = (FAR char *)g_nullstring;
#ifdef CONFIG_NSH_CMDPARMS
/* Are we being asked to use the output from another command or program
* as an input parameters for this command?
*/
if (*cmdline == '`')
{
/* Verify that the final character is also a backquote */
FAR char *rptr = strchr(cmdline + 1, '`');
if (!rptr || rptr[1] != '\0')
{
nsh_output(vtbl, g_fmtnomatching, "`", "`");
return (FAR char *)g_nullstring;
}
/* Replace the final backquote with a NUL terminator */
*rptr = '\0';
/* Then execute the command to get the parameter value */
argument = nsh_cmdparm(vtbl, cmdline + 1, allocation);
}
else
#endif
#ifndef CONFIG_DISABLE_ENVIRON
/* Check for references to environment variables */
if (*cmdline == '$')
{
argument = nsh_envexpand(vtbl, cmdline + 1);
}
else
#endif
{
/* The argument to be returned is simply the beginning of the
* delimited string.
*/
argument = cmdline;
}
return argument;
}
#endif
/****************************************************************************
* Name: nsh_argument
****************************************************************************/
static FAR char *nsh_argument(FAR struct nsh_vtbl_s *vtbl, FAR char **saveptr,
FAR NSH_MEMLIST_TYPE *memlist)
{
FAR char *pbegin = *saveptr;
FAR char *pend = NULL;
FAR char *allocation = NULL;
FAR char *argument = NULL;
FAR const char *term;
#ifdef CONFIG_NSH_CMDPARMS
bool backquote;
#endif
/* Find the beginning of the next token */
for (;
*pbegin && strchr(g_token_separator, *pbegin) != NULL;
pbegin++);
/* If we are at the end of the string with nothing but delimiters found,
* then return NULL, meaning that there are no further arguments on the line.
*/
if (!*pbegin)
{
return NULL;
}
/* Does the token begin with '>' -- redirection of output? */
if (*pbegin == '>')
{
/* Yes.. does it begin with ">>"? */
if (*(pbegin + 1) == '>')
{
*saveptr = pbegin + 2;
argument = (FAR char *)g_redirect2;
}
else
{
*saveptr = pbegin + 1;
argument = (FAR char *)g_redirect1;
}
}
/* Does the token begin with '#' -- comment */
else if (*pbegin == '#')
{
/* Return NULL meaning that we are at the end of the line */
*saveptr = pbegin;
argument = NULL;
}
/* Otherwise, it is a normal argument and we have to parse using the normal
* rules to find the end of the argument.
*/
else
{
/* However, the rules are a little different if the next argument is
* a quoted string.
*/
if (*pbegin == '"')
{
/* A quoted string can only be terminated with another quotation
* mark.
*/
pbegin++;
term = "\"";
}
else
{
/* No, then any of the usual separators will terminate the argument */
term = g_token_separator;
}
/* Find the end of the string */
#ifdef CONFIG_NSH_CMDPARMS
/* Some special care must be exercised to make sure that we do not break up
* any backquote delimited substrings. NOTE that the absence of a closing
* backquote is not detected; That case should be detected later.
*/
for (backquote = false, pend = pbegin; *pend; pend++)
{
/* Toggle the backquote flag when one is encountered? */
if (*pend == '`')
{
backquote = !backquote;
}
/* Check for a delimiting character only if we are not in a
* backquoted sub-string.
*/
else if (!backquote && strchr(term, *pend) != NULL)
{
/* We found a delimiter outside of anybackqouted substring.
* Now we can break out of the loop.
*/
break;
}
}
#else
for (pend = pbegin + 1; *pend && strchr(term, *pend) == NULL; pend++);
#endif
/* pend either points to the end of the string or to the first
* delimiter after the string.
*/
if (*pend)
{
/* Turn the delimiter into a NUL terminator */
*pend++ = '\0';
}
/* Save the pointer where we left off */
*saveptr = pend;
/* Perform expansions as necessary for the argument */
argument = nsh_argexpand(vtbl, pbegin, &allocation);
}
/* If any memory was allocated for this argument, make sure that it is
* added to the list of memory to be freed at the end of commend
* processing.
*/
NSH_MEMLIST_ADD(memlist, allocation);
/* Return the parsed argument. */
return argument;
}
/****************************************************************************
* Name: nsh_loop_enabled
****************************************************************************/
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
static bool nsh_loop_enabled(FAR struct nsh_vtbl_s *vtbl)
{
FAR struct nsh_parser_s *np = &vtbl->np;
/* If we are looping and the disable bit is set, then we are skipping
* all data until we next get to the 'done' token at the end of the
* loop.
*/
if (np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_DO)
{
/* We have parsed 'do', looking for 'done' */
return (bool)np->np_lpstate[np->np_lpndx].lp_enable;
}
return true;
}
#else
# define nsh_loop_enabled(vtbl) true
#endif
/****************************************************************************
* Name: nsh_itef_enabled
****************************************************************************/
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_ITEF)
static bool nsh_itef_enabled(FAR struct nsh_vtbl_s *vtbl)
{
FAR struct nsh_parser_s *np = &vtbl->np;
bool ret = !np->np_iestate[np->np_iendx].ie_disabled;
if (ret)
{
switch (np->np_iestate[np->np_iendx].ie_state)
{
case NSH_ITEF_NORMAL:
case NSH_ITEF_IF:
default:
break;
case NSH_ITEF_THEN:
ret = !np->np_iestate[np->np_iendx].ie_ifcond;
break;
case NSH_ITEF_ELSE:
ret = np->np_iestate[np->np_iendx].ie_ifcond;
break;
}
}
return ret;
}
#else
# define nsh_itef_enabled(vtbl) true
#endif
/****************************************************************************
* Name: nsh_cmdenabled
****************************************************************************/
#ifndef CONFIG_NSH_DISABLESCRIPT
static bool nsh_cmdenabled(FAR struct nsh_vtbl_s *vtbl)
{
/* Return true if command processing is enabled on this pass through the
* loop AND if command processing is enabled in this part of the if-then-
* else-fi sequence.
*/
return (nsh_loop_enabled(vtbl) && nsh_itef_enabled(vtbl));
}
#endif
/****************************************************************************
* Name: nsh_loop
****************************************************************************/
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
static int nsh_loop(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist)
{
FAR struct nsh_parser_s *np = &vtbl->np;
FAR char *cmd = *ppcmd;
long offset;
bool whilematch;
bool untilmatch;
bool enable;
int ret;
if (cmd)
{
/* Check if the command is preceded by "while" or "until" */
whilematch = strcmp(cmd, "while");
untilmatch = strcmp(cmd, "until");
if (whilematch == 0 || untilmatch == 0)
{
uint8_t state;
/* Get the cmd following the "while" or "until" */
*ppcmd = nsh_argument(vtbl, saveptr, memlist);
if (!*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "if");
goto errout;
}
/* Verify that "while" or "until" is valid in this context */
if (
#ifndef CONFIG_NSH_DISABLE_ITEF
np->np_iestate[np->np_iendx].ie_state == NSH_ITEF_IF ||
#endif
np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_WHILE ||
np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_UNTIL ||
np->np_stream == NULL || np->np_foffs < 0)
{
nsh_output(vtbl, g_fmtcontext, cmd);
goto errout;
}
/* Check if we have exceeded the maximum depth of nesting */
if (np->np_lpndx >= CONFIG_NSH_NESTDEPTH-1)
{
nsh_output(vtbl, g_fmtdeepnesting, cmd);
goto errout;
}
/* "Push" the old state and set the new state */
state = whilematch == 0 ? NSH_LOOP_WHILE : NSH_LOOP_UNTIL;
enable = nsh_cmdenabled(vtbl);
#ifdef NSH_DISABLE_SEMICOLON
offset = np->np_foffs;
#else
offset = np->np_foffs + np->np_loffs;
#endif
#ifndef NSH_DISABLE_SEMICOLON
np->np_jump = false;
#endif
np->np_lpndx++;
np->np_lpstate[np->np_lpndx].lp_state = state;
np->np_lpstate[np->np_lpndx].lp_enable = enable;
#ifndef CONFIG_NSH_DISABLE_ITEF
np->np_lpstate[np->np_lpndx].lp_iendx = np->np_iendx;
#endif
np->np_lpstate[np->np_lpndx].lp_topoffs = offset;
}
/* Check if the token is "do" */
else if (strcmp(cmd, "do") == 0)
{
/* Get the cmd following the "do" -- there may or may not be one */
*ppcmd = nsh_argument(vtbl, saveptr, memlist);
/* Verify that "do" is valid in this context */
if (np->np_lpstate[np->np_lpndx].lp_state != NSH_LOOP_WHILE &&
np->np_lpstate[np->np_lpndx].lp_state != NSH_LOOP_UNTIL)
{
nsh_output(vtbl, g_fmtcontext, "do");
goto errout;
}
np->np_lpstate[np->np_lpndx].lp_state = NSH_LOOP_DO;
}
/* Check if the token is "done" */
else if (strcmp(cmd, "done") == 0)
{
/* Get the cmd following the "done" -- there should be one */
*ppcmd = nsh_argument(vtbl, saveptr, memlist);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "done");
goto errout;
}
/* Verify that "done" is valid in this context */
if (np->np_lpstate[np->np_lpndx].lp_state != NSH_LOOP_DO)
{
nsh_output(vtbl, g_fmtcontext, "done");
goto errout;
}
if (np->np_lpndx < 1) /* Shouldn't happen */
{
nsh_output(vtbl, g_fmtinternalerror, "done");
goto errout;
}
/* Now what do we do? We either: Do go back to the top of the
* loop (if lp_enable == true) or continue past the end of the
* loop (if lp_enable == false)
*/
if (np->np_lpstate[np->np_lpndx].lp_enable)
{
/* Set the new file position to the top of the loop offset */
ret = fseek(np->np_stream,
np->np_lpstate[np->np_lpndx].lp_topoffs,
SEEK_SET);
if (ret < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, "done", "fseek", NSH_ERRNO);
}
#ifndef NSH_DISABLE_SEMICOLON
/* Signal nsh_parse that we need to stop processing the
* current line and jump back to the top of the loop.
*/
np->np_jump = true;
#endif
}
else
{
np->np_lpstate[np->np_lpndx].lp_enable = true;
}
/* "Pop" the previous state. We do this no matter what we
* decided to do
*/
np->np_lpstate[np->np_lpndx].lp_state = NSH_LOOP_NORMAL;
np->np_lpndx--;
}
/* If we just parsed "while" or "until", then nothing is acceptable
* other than "do"
*/
else if (np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_WHILE ||
np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_UNTIL)
{
nsh_output(vtbl, g_fmtcontext, cmd);
goto errout;
}
}
return OK;
errout:
#ifndef NSH_DISABLE_SEMICOLON
np->np_jump = false;
#endif
np->np_lpndx = 0;
np->np_lpstate[0].lp_state = NSH_LOOP_NORMAL;
np->np_lpstate[0].lp_enable = true;
np->np_lpstate[0].lp_topoffs = 0;
return ERROR;
}
#endif
/****************************************************************************
* Name: nsh_itef
****************************************************************************/
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_ITEF)
static int nsh_itef(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist)
{
FAR struct nsh_parser_s *np = &vtbl->np;
FAR char *cmd = *ppcmd;
bool disabled;
if (cmd)
{
/* Check if the command is preceded by "if" */
if (strcmp(cmd, "if") == 0)
{
/* Get the cmd following the if */
*ppcmd = nsh_argument(vtbl, saveptr, memlist);
if (!*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "if");
goto errout;
}
/* Verify that "if" is valid in this context */
if (np->np_iestate[np->np_iendx].ie_state == NSH_ITEF_IF)
{
nsh_output(vtbl, g_fmtcontext, "if");
goto errout;
}
/* Check if we have exceeded the maximum depth of nesting */
if (np->np_iendx >= CONFIG_NSH_NESTDEPTH-1)
{
nsh_output(vtbl, g_fmtdeepnesting, "if");
goto errout;
}
/* "Push" the old state and set the new state */
disabled = !nsh_cmdenabled(vtbl);
np->np_iendx++;
np->np_iestate[np->np_iendx].ie_state = NSH_ITEF_IF;
np->np_iestate[np->np_iendx].ie_disabled = disabled;
np->np_iestate[np->np_iendx].ie_ifcond = false;
}
/* Check if the token is "then" */
else if (strcmp(cmd, "then") == 0)
{
/* Get the cmd following the "then" -- there may or may not be one */
*ppcmd = nsh_argument(vtbl, saveptr, memlist);
/* Verify that "then" is valid in this context */
if (np->np_iestate[np->np_iendx].ie_state != NSH_ITEF_IF)
{
nsh_output(vtbl, g_fmtcontext, "then");
goto errout;
}
np->np_iestate[np->np_iendx].ie_state = NSH_ITEF_THEN;
}
/* Check if the token is "else" */
else if (strcmp(cmd, "else") == 0)
{
/* Get the cmd following the "else" -- there may or may not be one */
*ppcmd = nsh_argument(vtbl, saveptr, memlist);
/* Verify that "else" is valid in this context */
if (np->np_iestate[np->np_iendx].ie_state != NSH_ITEF_THEN)
{
nsh_output(vtbl, g_fmtcontext, "else");
goto errout;
}
np->np_iestate[np->np_iendx].ie_state = NSH_ITEF_ELSE;
}
/* Check if the token is "fi" */
else if (strcmp(cmd, "fi") == 0)
{
/* Get the cmd following the fi -- there should be one */
*ppcmd = nsh_argument(vtbl, saveptr, memlist);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "fi");
goto errout;
}
/* Verify that "fi" is valid in this context */
if (np->np_iestate[np->np_iendx].ie_state != NSH_ITEF_THEN &&
np->np_iestate[np->np_iendx].ie_state != NSH_ITEF_ELSE)
{
nsh_output(vtbl, g_fmtcontext, "fi");
goto errout;
}
if (np->np_iendx < 1) /* Shouldn't happen */
{
nsh_output(vtbl, g_fmtinternalerror, "if");
goto errout;
}
/* "Pop" the previous state */
np->np_iendx--;
}
/* If we just parsed "if", then nothing is acceptable other than "then" */
else if (np->np_iestate[np->np_iendx].ie_state == NSH_ITEF_IF)
{
nsh_output(vtbl, g_fmtcontext, cmd);
goto errout;
}
}
return OK;
errout:
np->np_iendx = 0;
np->np_iestate[0].ie_state = NSH_ITEF_NORMAL;
np->np_iestate[0].ie_disabled = false;
np->np_iestate[0].ie_ifcond = false;
return ERROR;
}
#endif
/****************************************************************************
* Name: nsh_nice
****************************************************************************/
#ifndef CONFIG_NSH_DISABLEBG
static int nsh_nice(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist)
{
FAR char *cmd = *ppcmd;
vtbl->np.np_nice = 0;
if (cmd)
{
/* Check if the command is preceded by "nice" */
if (strcmp(cmd, "nice") == 0)
{
/* Nicenesses range from -20 (most favorable scheduling) to 19
* (least favorable). Default is 10.
*/
vtbl->np.np_nice = 10;
/* Get the cmd (or -d option of nice command) */
cmd = nsh_argument(vtbl, saveptr, memlist);
if (cmd && strcmp(cmd, "-d") == 0)
{
FAR char *val = nsh_argument(vtbl, saveptr, memlist);
if (val)
{
char *endptr;
vtbl->np.np_nice = (int)strtol(val, &endptr, 0);
if (vtbl->np.np_nice > 19 || vtbl->np.np_nice < -20 ||
endptr == val || *endptr != '\0')
{
nsh_output(vtbl, g_fmtarginvalid, "nice");
return ERROR;
}
cmd = nsh_argument(vtbl, saveptr, memlist);
}
}
/* Return the real command name */
*ppcmd = cmd;
}
}
return OK;
}
#endif
/****************************************************************************
* Name: nsh_parse_cmdparm
*
* Description:
* This function parses and executes a simple NSH command. Output is
* always redirected. This function supports command parameters like
*
* set FOO `hello`
*
* which would set the environment variable FOO to the output from
* the hello program
*
****************************************************************************/
#ifdef CONFIG_NSH_CMDPARMS
static int nsh_parse_cmdparm(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
FAR const char *redirfile)
{
NSH_MEMLIST_TYPE memlist;
FAR char *argv[MAX_ARGV_ENTRIES];
FAR char *saveptr;
FAR char *cmd;
bool bgsave;
bool redirsave;
int argc;
int ret;
/* Initialize parser state */
memset(argv, 0, MAX_ARGV_ENTRIES*sizeof(FAR char *));
NSH_MEMLIST_INIT(memlist);
/* If any options like nice, redirection, or backgrounding are attempted,
* these will not be recognized and will just be passed through as
* normal, invalid commands or parameters.
*/
#ifndef CONFIG_NSH_DISABLEBG
/* The command is never backgrounded . Remember the current backgrounding
* state
*/
bgsave = vtbl->np.np_bg;
vtbl->np.np_bg = false;
#endif
/* Output is always redirected. Remember the current redirection state */
redirsave = vtbl->np.np_redirect;
vtbl->np.np_redirect = true;
/* Parse out the command at the beginning of the line */
saveptr = cmdline;
cmd = nsh_argument(vtbl, &saveptr, &memlist);
/* Check if any command was provided -OR- if command processing is
* currently disabled.
*/
#ifndef CONFIG_NSH_DISABLESCRIPT
if (!cmd || !nsh_cmdenabled(vtbl))
#else
if (!cmd)
#endif
{
/* An empty line is not an error and an unprocessed command cannot
* generate an error, but neither should it change the last command
* status.
*/
NSH_MEMLIST_FREE(&memlist);
return OK;
}
/* Parse all of the arguments following the command name. The form
* of argv is:
*
* argv[0]: The command name.
* argv[1]: The beginning of argument (up to CONFIG_NSH_MAXARGUMENTS)
* argv[argc]: NULL terminating pointer
*
* Maximum size is CONFIG_NSH_MAXARGUMENTS+1
*/
argv[0] = cmd;
for (argc = 1; argc < MAX_ARGV_ENTRIES-1; argc++)
{
argv[argc] = nsh_argument(vtbl, &saveptr, &memlist);
if (!argv[argc])
{
break;
}
}
argv[argc] = NULL;
/* Check if the maximum number of arguments was exceeded */
if (argc > CONFIG_NSH_MAXARGUMENTS)
{
nsh_output(vtbl, g_fmttoomanyargs, cmd);
}
/* Then execute the command */
ret = nsh_execute(vtbl, argc, argv, redirfile, O_WRONLY|O_CREAT|O_TRUNC);
/* Restore the backgrounding and redirection state */
#ifndef CONFIG_NSH_DISABLEBG
vtbl->np.np_bg = bgsave;
#endif
vtbl->np.np_redirect = redirsave;
NSH_MEMLIST_FREE(&memlist);
return ret;
}
#endif
/****************************************************************************
* Name: nsh_parse_command
*
* Description:
* This function parses and executes one NSH command from the command line.
*
****************************************************************************/
static int nsh_parse_command(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline)
{
NSH_MEMLIST_TYPE memlist;
FAR char *argv[MAX_ARGV_ENTRIES];
FAR char *saveptr;
FAR char *cmd;
FAR char *redirfile = NULL;
int oflags = 0;
int argc;
int ret;
/* Initialize parser state */
memset(argv, 0, MAX_ARGV_ENTRIES*sizeof(FAR char *));
NSH_MEMLIST_INIT(memlist);
#ifndef CONFIG_NSH_DISABLEBG
vtbl->np.np_bg = false;
#endif
#if CONFIG_NFILE_STREAMS > 0
vtbl->np.np_redirect = false;
#endif
/* Parse out the command at the beginning of the line */
saveptr = cmdline;
cmd = nsh_argument(vtbl, &saveptr, &memlist);
#ifndef CONFIG_NSH_DISABLESCRIPT
#ifndef CONFIG_NSH_DISABLE_LOOPS
/* Handle while-do-done and until-do-done loops */
if (nsh_loop(vtbl, &cmd, &saveptr, &memlist) != 0)
{
NSH_MEMLIST_FREE(&memlist);
return nsh_saveresult(vtbl, true);
}
#endif
#ifndef CONFIG_NSH_DISABLE_ITEF
/* Handle if-then-else-fi */
if (nsh_itef(vtbl, &cmd, &saveptr, &memlist) != 0)
{
NSH_MEMLIST_FREE(&memlist);
return nsh_saveresult(vtbl, true);
}
#endif
#endif
/* Handle nice */
#ifndef CONFIG_NSH_DISABLEBG
if (nsh_nice(vtbl, &cmd, &saveptr, &memlist) != 0)
{
NSH_MEMLIST_FREE(&memlist);
return nsh_saveresult(vtbl, true);
}
#endif
/* Check if any command was provided -OR- if command processing is
* currently disabled.
*/
#ifndef CONFIG_NSH_DISABLESCRIPT
if (!cmd || !nsh_cmdenabled(vtbl))
#else
if (!cmd)
#endif
{
/* An empty line is not an error and an unprocessed command cannot
* generate an error, but neither should it change the last command
* status.
*/
NSH_MEMLIST_FREE(&memlist);
return OK;
}
/* Parse all of the arguments following the command name. The form
* of argv is:
*
* argv[0]: The command name.
* argv[1]: The beginning of argument (up to CONFIG_NSH_MAXARGUMENTS)
* argv[argc-3]: Possibly '>' or '>>'
* argv[argc-2]: Possibly <file>
* argv[argc-1]: Possibly '&'
* argv[argc]: NULL terminating pointer
*
* Maximum size is CONFIG_NSH_MAXARGUMENTS+5
*/
argv[0] = cmd;
for (argc = 1; argc < MAX_ARGV_ENTRIES-1; argc++)
{
argv[argc] = nsh_argument(vtbl, &saveptr, &memlist);
if (!argv[argc])
{
break;
}
}
argv[argc] = NULL;
/* Check if the command should run in background */
#ifndef CONFIG_NSH_DISABLEBG
if (argc > 1 && strcmp(argv[argc-1], "&") == 0)
{
vtbl->np.np_bg = true;
argv[argc-1] = NULL;
argc--;
}
#endif
#if CONFIG_NFILE_STREAMS > 0
/* Check if the output was re-directed using > or >> */
if (argc > 2)
{
/* Check for redirection to a new file */
if (strcmp(argv[argc-2], g_redirect1) == 0)
{
vtbl->np.np_redirect = true;
oflags = O_WRONLY|O_CREAT|O_TRUNC;
redirfile = nsh_getfullpath(vtbl, argv[argc-1]);
argc -= 2;
}
/* Check for redirection by appending to an existing file */
else if (strcmp(argv[argc-2], g_redirect2) == 0)
{
vtbl->np.np_redirect = true;
oflags = O_WRONLY|O_CREAT|O_APPEND;
redirfile = nsh_getfullpath(vtbl, argv[argc-1]);
argc -= 2;
}
}
#endif
/* Check if the maximum number of arguments was exceeded */
if (argc > CONFIG_NSH_MAXARGUMENTS)
{
nsh_output(vtbl, g_fmttoomanyargs, cmd);
}
/* Then execute the command */
ret = nsh_execute(vtbl, argc, argv, redirfile, oflags);
/* Free any allocated resources */
#if CONFIG_NFILE_STREAMS > 0
/* Free the redirected output file path */
if (redirfile)
{
nsh_freefullpath(redirfile);
}
#endif
NSH_MEMLIST_FREE(&memlist);
return ret;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_parse
*
* Description:
* This function parses and executes the line of text received from the
* user. This may consist of one or more NSH commands. Multiple NSH
* commands are separated by semi-colons.
*
****************************************************************************/
int nsh_parse(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline)
{
#ifdef NSH_DISABLE_SEMICOLON
return nsh_parse_command(vtbl, cmdline);
#else
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
FAR struct nsh_parser_s *np = &vtbl->np;
#endif
FAR char *start = cmdline;
FAR char *working = cmdline;
FAR char *ptr;
size_t len;
int ret;
/* Loop until all of the commands on the command line have been processed OR
* until the end-of-loop has been recountered and we need to reload the line
* at the top of the loop.
*/
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
for (np->np_jump = false; !np->np_jump; )
#else
for (;;)
#endif
{
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
/* Save the offset on the line to the start of the command */
np->np_loffs = (uint16_t)(working - cmdline);
#endif
/* A command may be terminated with a newline character, the end of the
* line, a semicolon, or a '#' character. NOTE that the set of
* delimiting characters includes the quotation mark. We need to
* handle quotation marks here because any other delimiter within a
* quoted string must be treated as normal text.
*/
len = strcspn(working, g_line_separator);
ptr = working + len;
/* Check for the last command on the line. This means that the none
* of the delimiting characters was found or that the newline or '#'
* character was found. Anything after the newline or '#' character
* is ignored (there should not be anything after a newline, of
* course).
*/
if (*ptr == '\0' || *ptr == '\n' || *ptr == '#')
{
/* Parse the last command on the line */
return nsh_parse_command(vtbl, start);
}
/* Check for a command terminated with ';'. There is probably another
* command on the command line after this one.
*/
else if (*ptr == ';')
{
/* Terminate the line */
*ptr++ = '\0';
/* Parse this command */
ret = nsh_parse_command(vtbl, start);
if (ret != OK)
{
/* nsh_parse_command may return (1) -1 (ERROR) meaning that the
* command failed or we failed to start the command application
* or (2) 1 meaning that the application task was spawned
* successfully but returned failure exit status.
*/
return ret;
}
/* Then set the start of the next command on the command line */
start = ptr;
working = ptr;
}
/* Check if we encountered a quoted string */
else /* if (*ptr == '"') */
{
/* Find the closing quotation mark */
FAR char *tmp = strchr(ptr + 1, '"');
if (!tmp)
{
/* No closing quotation mark! */
nsh_output(vtbl, g_fmtnomatching, "\"", "\"");
return ERROR;
}
/* Otherwise, continue parsing after the closing quotation mark */
working = ++tmp;
}
}
#ifndef CONFIG_NSH_DISABLESCRIPT
return OK;
#endif
#endif
}
/****************************************************************************
* Name: cmd_break
****************************************************************************/
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_LOOPS)
int cmd_break(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
FAR struct nsh_parser_s *np = &vtbl->np;
/* Break outside of a loop is ignored */
if (np->np_lpstate[np->np_lpndx].lp_state == NSH_LOOP_DO)
{
#ifndef CONFIG_NSH_DISABLE_ITEF
/* Yes... pop the original if-then-else-if state */
np->np_iendx = np->np_lpstate[np->np_lpndx].lp_iendx;
#endif
/* Disable all command processing until 'done' is encountered. */
np->np_lpstate[np->np_lpndx].lp_enable = false;
}
/* No syntax errors are detected(?). Break is a nop everywhere except
* the supported context.
*/
return OK;
}
#endif
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