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px4-firmware/apps/nshlib/nsh_parse.c

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/****************************************************************************
* apps/nshlib/nsh_parse.c
*
* Copyright (C) 2007-2012 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 <sys/stat.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sched.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/version.h>
#ifndef CONFIG_NSH_DISABLEBG
# include <pthread.h>
#endif
#ifdef CONFIG_NSH_BUILTIN_APPS
# include <apps/apps.h>
#endif
#include <apps/nsh.h>
#include "nsh.h"
#include "nsh_console.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Argument list size
*
* argv[0]: The command name.
* argv[1]: The beginning of argument (up to NSH_MAX_ARGUMENTS)
* argv[argc-3]: Possibly '>' or '>>'
* argv[argc-2]: Possibly <file>
* argv[argc-1]: Possibly '&' (if pthreads are enabled)
* argv[argc]: NULL terminating pointer
*
* Maximum size is NSH_MAX_ARGUMENTS+5
*/
#ifndef CONFIG_NSH_DISABLEBG
# define MAX_ARGV_ENTRIES (NSH_MAX_ARGUMENTS+5)
#else
# define MAX_ARGV_ENTRIES (NSH_MAX_ARGUMENTS+4)
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct cmdmap_s
{
const char *cmd; /* Name of the command */
cmd_t handler; /* Function that handles the command */
uint8_t minargs; /* Minimum number of arguments (including command) */
uint8_t maxargs; /* Maximum number of arguments (including command) */
const char *usage; /* Usage instructions for 'help' command */
};
#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
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_HELP
static int cmd_help(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
#endif
#ifndef CONFIG_NSH_DISABLE_EXIT
static int cmd_exit(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
#endif
static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv);
/****************************************************************************
* Private Data
****************************************************************************/
static const char g_delim[] = " \t\n";
static const char g_redirect1[] = ">";
static const char g_redirect2[] = ">>";
static const char g_exitstatus[] = "$?";
static const char g_success[] = "0";
static const char g_failure[] = "1";
static const struct cmdmap_s g_cmdmap[] =
{
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_TEST)
{ "[", cmd_lbracket, 4, NSH_MAX_ARGUMENTS, "<expression> ]" },
#endif
#ifndef CONFIG_NSH_DISABLE_HELP
{ "?", cmd_help, 1, 1, NULL },
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0
# ifndef CONFIG_NSH_DISABLE_CAT
{ "cat", cmd_cat, 2, NSH_MAX_ARGUMENTS, "<path> [<path> [<path> ...]]" },
# endif
#ifndef CONFIG_DISABLE_ENVIRON
# ifndef CONFIG_NSH_DISABLE_CD
{ "cd", cmd_cd, 1, 2, "[<dir-path>|-|~|..]" },
# endif
#endif
# ifndef CONFIG_NSH_DISABLE_CP
{ "cp", cmd_cp, 3, 3, "<source-path> <dest-path>" },
# endif
#endif
#if defined (CONFIG_RTC) && !defined(CONFIG_DISABLE_CLOCK) && !defined(CONFIG_NSH_DISABLE_DATE)
{ "date", cmd_date, 1, 3, "[-s \"MMM DD HH:MM:SS YYYY\"]" },
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0
# ifndef CONFIG_NSH_DISABLE_DD
{ "dd", cmd_dd, 3, 6, "if=<infile> of=<outfile> [bs=<sectsize>] [count=<sectors>] [skip=<sectors>]" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_ECHO
# ifndef CONFIG_DISABLE_ENVIRON
{ "echo", cmd_echo, 0, NSH_MAX_ARGUMENTS, "[<string|$name> [<string|$name>...]]" },
# else
{ "echo", cmd_echo, 0, NSH_MAX_ARGUMENTS, "[<string> [<string>...]]" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_EXEC
{ "exec", cmd_exec, 2, 3, "<hex-address>" },
#endif
#ifndef CONFIG_NSH_DISABLE_EXIT
{ "exit", cmd_exit, 1, 1, NULL },
#endif
#ifndef CONFIG_NSH_DISABLE_FREE
{ "free", cmd_free, 1, 1, NULL },
#endif
#if defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0
# ifndef CONFIG_NSH_DISABLE_GET
{ "get", cmd_get, 4, 7, "[-b|-n] [-f <local-path>] -h <ip-address> <remote-path>" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_HELP
{ "help", cmd_help, 1, 1, NULL },
#endif
#ifdef CONFIG_NET
# ifndef CONFIG_NSH_DISABLE_IFCONFIG
{ "ifconfig", cmd_ifconfig, 1, 3, "[nic_name [ip]]" },
# endif
#endif
#ifndef CONFIG_DISABLE_SIGNALS
# ifndef CONFIG_NSH_DISABLE_KILL
{ "kill", cmd_kill, 3, 3, "-<signal> <pid>" },
# endif
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_MOUNTPOINT)
# ifndef CONFIG_NSH_DISABLE_LOSETUP
{ "losetup", cmd_losetup, 3, 6, "[-d <dev-path>] | [[-o <offset>] [-r] <dev-path> <file-path>]" },
# endif
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0
# ifndef CONFIG_NSH_DISABLE_LS
{ "ls", cmd_ls, 1, 5, "[-lRs] <dir-path>" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_MB
{ "mb", cmd_mb, 2, 3, "<hex-address>[=<hex-value>][ <hex-byte-count>]" },
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_FS_WRITABLE)
# ifndef CONFIG_NSH_DISABLE_MKDIR
{ "mkdir", cmd_mkdir, 2, 2, "<path>" },
# endif
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_FS_FAT)
# ifndef CONFIG_NSH_DISABLE_MKFATFS
{ "mkfatfs", cmd_mkfatfs, 2, 2, "<path>" },
# endif
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0
# ifndef CONFIG_NSH_DISABLE_MKFIFO
{ "mkfifo", cmd_mkfifo, 2, 2, "<path>" },
# endif
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_FS_WRITABLE)
# ifndef CONFIG_NSH_DISABLE_MKRD
{ "mkrd", cmd_mkrd, 2, 6, "[-m <minor>] [-s <sector-size>] <nsectors>" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_MH
{ "mh", cmd_mh, 2, 3, "<hex-address>[=<hex-value>][ <hex-byte-count>]" },
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_FS_READABLE)
# ifndef CONFIG_NSH_DISABLE_MOUNT
{ "mount", cmd_mount, 4, 5, "-t <fstype> <block-device> <dir-path>" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_MW
{ "mw", cmd_mw, 2, 3, "<hex-address>[=<hex-value>][ <hex-byte-count>]" },
#endif
#if defined(CONFIG_NET) && defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_PING) && \
!defined(CONFIG_DISABLE_CLOCK) && !defined(CONFIG_DISABLE_SIGNALS)
# ifndef CONFIG_NSH_DISABLE_PING
{ "ping", cmd_ping, 2, 6, "[-c <count>] [-i <interval>] <ip-address>" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_PS
{ "ps", cmd_ps, 1, 1, NULL },
#endif
#if defined(CONFIG_NET_UDP) && CONFIG_NFILE_DESCRIPTORS > 0
# ifndef CONFIG_NSH_DISABLE_PUT
{ "put", cmd_put, 4, 7, "[-b|-n] [-f <remote-path>] -h <ip-address> <local-path>" },
# endif
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0 && !defined(CONFIG_DISABLE_ENVIRON)
# ifndef CONFIG_NSH_DISABLE_PWD
{ "pwd", cmd_pwd, 1, 1, NULL },
# endif
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_FS_WRITABLE)
# ifndef CONFIG_NSH_DISABLE_RM
{ "rm", cmd_rm, 2, 2, "<file-path>" },
# endif
# ifndef CONFIG_NSH_DISABLE_RMDIR
{ "rmdir", cmd_rmdir, 2, 2, "<dir-path>" },
# endif
#endif
#ifndef CONFIG_DISABLE_ENVIRON
# ifndef CONFIG_NSH_DISABLE_SET
{ "set", cmd_set, 3, 3, "<name> <value>" },
# endif
#endif
#if CONFIG_NFILE_DESCRIPTORS > 0 && CONFIG_NFILE_STREAMS > 0 && !defined(CONFIG_NSH_DISABLESCRIPT)
# ifndef CONFIG_NSH_DISABLE_SH
{ "sh", cmd_sh, 2, 2, "<script-path>" },
# endif
#endif
#ifndef CONFIG_DISABLE_SIGNALS
# ifndef CONFIG_NSH_DISABLE_SLEEP
{ "sleep", cmd_sleep, 2, 2, "<sec>" },
# endif
#endif
#if !defined(CONFIG_NSH_DISABLESCRIPT) && !defined(CONFIG_NSH_DISABLE_TEST)
{ "test", cmd_test, 3, NSH_MAX_ARGUMENTS, "<expression>" },
#endif
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_FS_READABLE)
# ifndef CONFIG_NSH_DISABLE_UMOUNT
{ "umount", cmd_umount, 2, 2, "<dir-path>" },
# endif
#endif
#ifndef CONFIG_DISABLE_ENVIRON
# ifndef CONFIG_NSH_DISABLE_UNSET
{ "unset", cmd_unset, 2, 2, "<name>" },
# endif
#endif
#ifndef CONFIG_DISABLE_SIGNALS
# ifndef CONFIG_NSH_DISABLE_USLEEP
{ "usleep", cmd_usleep, 2, 2, "<usec>" },
# endif
#endif
#if defined(CONFIG_NET_TCP) && CONFIG_NFILE_DESCRIPTORS > 0
# ifndef CONFIG_NSH_DISABLE_GET
{ "wget", cmd_wget, 2, 4, "[-o <local-path>] <url>" },
# endif
#endif
#ifndef CONFIG_NSH_DISABLE_XD
{ "xd", cmd_xd, 3, 3, "<hex-address> <byte-count>" },
#endif
{ NULL, NULL, 1, 1, NULL }
};
/****************************************************************************
* 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
/* The NSH prompt */
const char g_nshprompt[] = "nsh> ";
/* Common, message formats */
const char g_nshsyntax[] = "nsh: %s: syntax error\n";
const char g_fmtargrequired[] = "nsh: %s: missing required argument(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: cmd_help
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_HELP
static int cmd_help(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
const struct cmdmap_s *ptr;
#ifdef CONFIG_NSH_BUILTIN_APPS
FAR const char * name;
int i;
#endif
nsh_output(vtbl, "NSH command forms:\n");
#ifndef CONFIG_NSH_DISABLEBG
nsh_output(vtbl, " [nice [-d <niceness>>]] <cmd> [> <file>|>> <file>] [&]\n");
#else
nsh_output(vtbl, " <cmd> [> <file>|>> <file>]\n");
#endif
#ifndef CONFIG_NSH_DISABLESCRIPT
nsh_output(vtbl, "OR\n");
nsh_output(vtbl, " if <cmd>\n");
nsh_output(vtbl, " then\n");
nsh_output(vtbl, " [sequence of <cmd>]\n");
nsh_output(vtbl, " else\n");
nsh_output(vtbl, " [sequence of <cmd>]\n");
nsh_output(vtbl, " fi\n");
#endif
nsh_output(vtbl, "Where <cmd> is one of:\n");
for (ptr = g_cmdmap; ptr->cmd; ptr++)
{
if (ptr->usage)
{
nsh_output(vtbl, " %s %s\n", ptr->cmd, ptr->usage);
}
else
{
nsh_output(vtbl, " %s\n", ptr->cmd);
}
}
/* List the set of available built-in commands */
#ifdef CONFIG_NSH_BUILTIN_APPS
nsh_output(vtbl, "\nBuiltin Apps:\n");
for (i = 0; (name = namedapp_getname(i)) != NULL; i++)
{
nsh_output(vtbl, " %s\n", name);
}
#endif
return OK;
}
#endif
/****************************************************************************
* Name: cmd_unrecognized
****************************************************************************/
static int cmd_unrecognized(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
nsh_output(vtbl, g_fmtcmdnotfound, argv[0]);
return ERROR;
}
/****************************************************************************
* Name: cmd_exit
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_EXIT
static int cmd_exit(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
{
nsh_exit(vtbl, 0);
return OK;
}
#endif
/****************************************************************************
* Name: nsh_execute
****************************************************************************/
static int nsh_execute(FAR struct nsh_vtbl_s *vtbl, int argc, char *argv[])
{
const struct cmdmap_s *cmdmap;
const char *cmd;
cmd_t handler = cmd_unrecognized;
int ret;
/* The form of argv is:
*
* argv[0]: The command name. This is argv[0] when the arguments
* are, finally, received by the command vtblr
* argv[1]: The beginning of argument (up to NSH_MAX_ARGUMENTS)
* argv[argc]: NULL terminating pointer
*/
cmd = argv[0];
/* Try to find a command in the application library.
*/
#ifdef CONFIG_NSH_BUILTIN_APPS
if (nsh_execapp(vtbl, cmd, argv) == OK)
{
/* The pre-built application was successfully started -- return OK. */
return OK;
}
#endif
/* See if the command is one that we understand */
for (cmdmap = g_cmdmap; cmdmap->cmd; cmdmap++)
{
if (strcmp(cmdmap->cmd, cmd) == 0)
{
/* Check if a valid number of arguments was provided. We
* do this simple, imperfect checking here so that it does
* not have to be performed in each command.
*/
if (argc < cmdmap->minargs)
{
/* Fewer than the minimum number were provided */
nsh_output(vtbl, g_fmtargrequired, cmd);
return ERROR;
}
else if (argc > cmdmap->maxargs)
{
/* More than the maximum number were provided */
nsh_output(vtbl, g_fmttoomanyargs, cmd);
return ERROR;
}
else
{
/* A valid number of arguments were provided (this does
* not mean they are right).
*/
handler = cmdmap->handler;
break;
}
}
}
ret = handler(vtbl, argc, argv);
return ret;
}
/****************************************************************************
* 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 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);
}
/* 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_execute(carg->vtbl, carg->argc, carg->argv);
/* Released the cloned arguments */
dbg("BG %s complete\n", carg->argv[0]);
nsh_releaseargs(carg);
return (void*)ret;
}
#endif
/****************************************************************************
* Name: nsh_cloneargs
****************************************************************************/
#ifndef CONFIG_NSH_DISABLEBG
static inline 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_argument
****************************************************************************/
char *nsh_argument(FAR struct nsh_vtbl_s *vtbl, char **saveptr)
{
char *pbegin = *saveptr;
char *pend = NULL;
const char *term;
#ifndef CONFIG_DISABLE_ENVIRON
bool quoted = false;
#endif
/* Find the beginning of the next token */
for (;
*pbegin && strchr(g_delim, *pbegin) != NULL;
pbegin++);
/* If we are at the end of the string with nothing
* but delimiters found, then return NULL.
*/
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;
pbegin = (char*)g_redirect2;
}
else
{
*saveptr = pbegin + 1;
pbegin = (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;
pbegin = NULL;
}
else
{
/* Otherwise, we are going to have to parse to find the end of
* the token. Does the token begin with '"'?
*/
if (*pbegin == '"')
{
/* Yes.. then only another '"' can terminate the string */
pbegin++;
term = "\"";
#ifndef CONFIG_DISABLE_ENVIRON
quoted = true;
#endif
}
else
{
/* No, then any of the usual terminators will terminate the argument */
term = g_delim;
}
/* Find the end of the string */
for (pend = pbegin + 1;
*pend && strchr(term, *pend) == NULL;
pend++);
/* pend either points to the end of the string or to
* the first delimiter after the string.
*/
if (*pend)
{
/* Turn the delimiter into a null terminator */
*pend++ = '\0';
}
/* Save the pointer where we left off */
*saveptr = pend;
#ifndef CONFIG_DISABLE_ENVIRON
/* Check for references to environment variables */
if (pbegin[0] == '$' && !quoted)
{
/* Check for built-in variables */
if (strcmp(pbegin, g_exitstatus) == 0)
{
if (vtbl->np.np_fail)
{
return (char*)g_failure;
}
else
{
return (char*)g_success;
}
}
/* Not a built-in? Return the value of the environment variable with this name */
else
{
char *value = getenv(pbegin+1);
if (value)
{
return value;
}
else
{
return (char*)"";
}
}
}
#endif
}
/* Return the beginning of the token. */
return pbegin;
}
/****************************************************************************
* Name: nsh_cmdenabled
****************************************************************************/
#ifndef CONFIG_NSH_DISABLESCRIPT
static inline bool nsh_cmdenabled(FAR struct nsh_vtbl_s *vtbl)
{
struct nsh_parser_s *np = &vtbl->np;
bool ret = !np->np_st[np->np_ndx].ns_disabled;
if (ret)
{
switch (np->np_st[np->np_ndx].ns_state)
{
case NSH_PARSER_NORMAL :
case NSH_PARSER_IF:
default:
break;
case NSH_PARSER_THEN:
ret = !np->np_st[np->np_ndx].ns_ifcond;
break;
case NSH_PARSER_ELSE:
ret = np->np_st[np->np_ndx].ns_ifcond;
break;
}
}
return ret;
}
#endif
/****************************************************************************
* Name: nsh_ifthenelse
****************************************************************************/
#ifndef CONFIG_NSH_DISABLESCRIPT
static inline int nsh_ifthenelse(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd, FAR char **saveptr)
{
struct nsh_parser_s *np = &vtbl->np;
FAR char *cmd = *ppcmd;
bool disabled;
if (cmd)
{
/* Check if the command is preceeded by "if" */
if (strcmp(cmd, "if") == 0)
{
/* Get the cmd following the if */
*ppcmd = nsh_argument(vtbl, saveptr);
if (!*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "if");
goto errout;
}
/* Verify that "if" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_NORMAL &&
np->np_st[np->np_ndx].ns_state != NSH_PARSER_THEN &&
np->np_st[np->np_ndx].ns_state != NSH_PARSER_ELSE)
{
nsh_output(vtbl, g_fmtcontext, "if");
goto errout;
}
/* Check if we have exceeded the maximum depth of nesting */
if (np->np_ndx >= 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_ndx++;
np->np_st[np->np_ndx].ns_state = NSH_PARSER_IF;
np->np_st[np->np_ndx].ns_disabled = disabled;
np->np_st[np->np_ndx].ns_ifcond = false;
}
else if (strcmp(cmd, "then") == 0)
{
/* Get the cmd following the then -- there shouldn't be one */
*ppcmd = nsh_argument(vtbl, saveptr);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "then");
goto errout;
}
/* Verify that "then" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_IF)
{
nsh_output(vtbl, g_fmtcontext, "then");
goto errout;
}
np->np_st[np->np_ndx].ns_state = NSH_PARSER_THEN;
}
else if (strcmp(cmd, "else") == 0)
{
/* Get the cmd following the else -- there shouldn't be one */
*ppcmd = nsh_argument(vtbl, saveptr);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "else");
goto errout;
}
/* Verify that "then" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_THEN)
{
nsh_output(vtbl, g_fmtcontext, "else");
goto errout;
}
np->np_st[np->np_ndx].ns_state = NSH_PARSER_ELSE;
}
else if (strcmp(cmd, "fi") == 0)
{
/* Get the cmd following the fi -- there should be one */
*ppcmd = nsh_argument(vtbl, saveptr);
if (*ppcmd)
{
nsh_output(vtbl, g_fmtarginvalid, "fi");
goto errout;
}
/* Verify that "fi" is valid in this context */
if (np->np_st[np->np_ndx].ns_state != NSH_PARSER_THEN &&
np->np_st[np->np_ndx].ns_state != NSH_PARSER_ELSE)
{
nsh_output(vtbl, g_fmtcontext, "fi");
goto errout;
}
if (np->np_ndx < 1) /* Shouldn't happen */
{
nsh_output(vtbl, g_fmtinternalerror, "if");
goto errout;
}
/* "Pop" the previous state */
np->np_ndx--;
}
else if (np->np_st[np->np_ndx].ns_state == NSH_PARSER_IF)
{
nsh_output(vtbl, g_fmtcontext, cmd);
goto errout;
}
}
return OK;
errout:
np->np_ndx = 0;
np->np_st[0].ns_state = NSH_PARSER_NORMAL;
np->np_st[0].ns_disabled = false;
np->np_st[0].ns_ifcond = false;
return ERROR;
}
#endif
/****************************************************************************
* Name: nsh_saveresult
****************************************************************************/
static inline int nsh_saveresult(FAR struct nsh_vtbl_s *vtbl, bool result)
{
struct nsh_parser_s *np = &vtbl->np;
#ifndef CONFIG_NSH_DISABLESCRIPT
if (np->np_st[np->np_ndx].ns_state == NSH_PARSER_IF)
{
np->np_fail = false;
np->np_st[np->np_ndx].ns_ifcond = result;
return OK;
}
else
#endif
{
np->np_fail = result;
return result ? ERROR : OK;
}
}
/****************************************************************************
* Name: nsh_nice
****************************************************************************/
#ifndef CONFIG_NSH_DISABLEBG
static inline int nsh_nice(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd, FAR char **saveptr)
{
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);
if (cmd && strcmp(cmd, "-d") == 0)
{
FAR char *val = nsh_argument(vtbl, saveptr);
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);
}
}
/* Return the real command name */
*ppcmd = cmd;
}
}
return OK;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_parse
*
* Description:
* This function parses and executes one NSH command.
*
****************************************************************************/
int nsh_parse(FAR struct nsh_vtbl_s *vtbl, char *cmdline)
{
FAR char *argv[MAX_ARGV_ENTRIES];
FAR char *saveptr;
FAR char *cmd;
FAR char *redirfile = NULL;
int fd = -1;
int oflags = 0;
int argc;
int ret;
/* Initialize parser state */
memset(argv, 0, MAX_ARGV_ENTRIES*sizeof(FAR char *));
#ifndef CONFIG_NSH_DISABLEBG
vtbl->np.np_bg = false;
#endif
vtbl->np.np_redirect = false;
/* Parse out the command at the beginning of the line */
saveptr = cmdline;
cmd = nsh_argument(vtbl, &saveptr);
/* Handler if-then-else-fi */
#ifndef CONFIG_NSH_DISABLESCRIPT
if (nsh_ifthenelse(vtbl, &cmd, &saveptr) != 0)
{
goto errout;
}
#endif
/* Handle nice */
#ifndef CONFIG_NSH_DISABLEBG
if (nsh_nice(vtbl, &cmd, &saveptr) != 0)
{
goto errout;
}
#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 they change the last
* command status.
*/
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 NSH_MAX_ARGUMENTS)
* argv[argc-3]: Possibly '>' or '>>'
* argv[argc-2]: Possibly <file>
* argv[argc-1]: Possibly '&'
* argv[argc]: NULL terminating pointer
*
* Maximum size is NSH_MAX_ARGUMENTS+5
*/
argv[0] = cmd;
for (argc = 1; argc < MAX_ARGV_ENTRIES-1; argc++)
{
argv[argc] = nsh_argument(vtbl, &saveptr);
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
/* 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;
}
}
/* 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);
nsh_freefullpath(redirfile);
redirfile = NULL;
if (fd < 0)
{
nsh_output(vtbl, g_fmtcmdfailed, cmd, "open", NSH_ERRNO);
goto errout;
}
}
/* Check if the maximum number of arguments was exceeded */
if (argc > NSH_MAX_ARGUMENTS)
{
nsh_output(vtbl, g_fmttoomanyargs, cmd);
}
/* Handle the case where the command is executed in background.
* However is app is to be started as namedapp new process will
* be created anyway, so skip this step. */
#ifndef CONFIG_NSH_DISABLEBG
if (vtbl->np.np_bg
#ifdef CONFIG_NSH_BUILTIN_APPS
&& namedapp_isavail(argv[0]) < 0
#endif
)
{
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;
}
/* Handle redirection of output via a file descriptor */
if (vtbl->np.np_redirect)
{
(void)nsh_redirect(bkgvtbl, fd, NULL);
}
/* Get the execution priority of this task */
ret = sched_getparam(0, &param);
if (ret != 0)
{
nsh_output(vtbl, g_fmtcmdfailed, cmd, "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, cmd, "pthread_create", NSH_ERRNO_OF(ret));
nsh_releaseargs(args);
nsh_release(bkgvtbl);
goto errout;
}
nsh_output(vtbl, "%s [%d:%d]\n", cmd, thread, param.sched_priority);
}
else
#endif
{
uint8_t save[SAVE_SIZE];
/* Handle redirection of output via a file descriptor */
if (vtbl->np.np_redirect)
{
nsh_redirect(vtbl, fd, save);
}
/* Then execute the command in "foreground" -- i.e., while the user waits
* for the next prompt.
*/
ret = nsh_execute(vtbl, argc, argv);
/* Restore the original output. Undirect will close the redirection
* file descriptor.
*/
if (vtbl->np.np_redirect)
{
nsh_undirect(vtbl, save);
}
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 (vtbl->np.np_redirect)
{
close(fd);
}
#endif
errout:
return nsh_saveresult(vtbl, true);
}
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