1945 lines
53 KiB
C
1945 lines
53 KiB
C
/****************************************************************************
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* apps/nshlib/nsh_parse.c
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*
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* Copyright (C) 2007-2013, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#ifdef CONFIG_NSH_CMDPARMS
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# include <sys/stat.h>
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#endif
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#include <apps/nsh.h>
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#include "nsh.h"
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#include "nsh_console.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* If CONFIG_NSH_CMDPARMS or CONFIG_NSH_ARGCAT is enabled, then we will need
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* retain a list of memory allocations to be freed at the completion of
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* command processing.
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*/
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#undef HAVE_MEMLIST
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#if defined(CONFIG_NSH_CMDPARMS) || defined(CONFIG_NSH_ARGCAT)
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# define HAVE_MEMLIST 1
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#endif
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#if defined(HAVE_MEMLIST) && !defined(CONFIG_NSH_MAXALLOCS)
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# ifdef CONFIG_NSH_ARGCAT
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# define CONFIG_NSH_MAXALLOCS (2*CONFIG_NSH_MAXARGUMENTS)
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# else
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# define CONFIG_NSH_MAXALLOCS CONFIG_NSH_MAXARGUMENTS
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# endif
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#endif
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/* Allocation list helper macros */
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#ifdef HAVE_MEMLIST
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# define NSH_MEMLIST_TYPE struct nsh_memlist_s
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# define NSH_MEMLIST_INIT(m) memset(&(m), 0, sizeof(struct nsh_memlist_s));
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# define NSH_MEMLIST_ADD(m,a) nsh_memlist_add(m,a)
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# define NSH_MEMLIST_FREE(m) nsh_memlist_free(m)
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#else
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# define NSH_MEMLIST_TYPE uint8_t
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# define NSH_MEMLIST_INIT(m) do { (m) = 0; } while (0)
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# define NSH_MEMLIST_ADD(m,a)
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# define NSH_MEMLIST_FREE(m)
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* These structure describes the parsed command line */
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#ifndef CONFIG_NSH_DISABLEBG
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struct cmdarg_s
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{
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FAR struct nsh_vtbl_s *vtbl; /* For front-end interaction */
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int fd; /* FD for output redirection */
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int argc; /* Number of arguments in argv */
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FAR char *argv[MAX_ARGV_ENTRIES]; /* Argument list */
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};
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#endif
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/* This structure describes the allocation list */
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#ifdef HAVE_MEMLIST
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struct nsh_memlist_s
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{
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int nallocs; /* Number of allocations */
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FAR char *allocations[CONFIG_NSH_MAXALLOCS];
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};
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#endif
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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#ifdef HAVE_MEMLIST
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static void nsh_memlist_add(FAR struct nsh_memlist_s *memlist,
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FAR char *allocation);
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static void nsh_memlist_free(FAR struct nsh_memlist_s *memlist);
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#endif
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#ifndef CONFIG_NSH_DISABLEBG
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static void nsh_releaseargs(struct cmdarg_s *arg);
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static pthread_addr_t nsh_child(pthread_addr_t arg);
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static struct cmdarg_s *nsh_cloneargs(FAR struct nsh_vtbl_s *vtbl,
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int fd, int argc, char *argv[]);
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#endif
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static int nsh_saveresult(FAR struct nsh_vtbl_s *vtbl, bool result);
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static int nsh_execute(FAR struct nsh_vtbl_s *vtbl,
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int argc, FAR char *argv[], FAR const char *redirfile,
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int oflags);
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#ifdef CONFIG_NSH_CMDPARMS
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static FAR char *nsh_filecat(FAR struct nsh_vtbl_s *vtbl, FAR char *s1,
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FAR const char *filename);
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static FAR char *nsh_cmdparm(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
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FAR char **allocation);
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#endif
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#ifdef CONFIG_NSH_ARGCAT
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static FAR char *nsh_strcat(FAR struct nsh_vtbl_s *vtbl, FAR char *s1,
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FAR const char *s2);
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#endif
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#ifndef CONFIG_DISABLE_ENVIRON
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static FAR char *nsh_envexpand(FAR struct nsh_vtbl_s *vtbl,
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FAR char *varname);
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#endif
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static FAR char *nsh_argexpand(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
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FAR char **allocation);
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static FAR char *nsh_argument(FAR struct nsh_vtbl_s *vtbl, char **saveptr,
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FAR NSH_MEMLIST_TYPE *memlist);
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#ifndef CONFIG_NSH_DISABLESCRIPT
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static bool nsh_cmdenabled(FAR struct nsh_vtbl_s *vtbl);
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static int nsh_ifthenelse(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
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FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist);
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#endif
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#ifndef CONFIG_NSH_DISABLEBG
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static int nsh_nice(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
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FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist);
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#endif
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#ifdef CONFIG_NSH_CMDPARMS
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static int nsh_parse_cmdparm(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
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FAR const char *redirfile);
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#endif
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static int nsh_parse_command(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const char g_token_separator[] = " \t\n";
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#ifndef NSH_DISABLE_SEMICOLON
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static const char g_line_separator[] = "\";\n";
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#endif
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#ifdef CONFIG_NSH_ARGCAT
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static const char g_arg_separator[] = "`$";
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#endif
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static const char g_redirect1[] = ">";
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static const char g_redirect2[] = ">>";
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#ifndef CONFIG_DISABLE_ENVIRON
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static const char g_exitstatus[] = "?";
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#endif
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static const char g_success[] = "0";
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static const char g_failure[] = "1";
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static const char g_nullstring[] = "";
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* If NuttX versioning information is available, Include that information
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* in the NSH greeting.
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*/
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#if CONFIG_VERSION_MAJOR != 0 || CONFIG_VERSION_MINOR != 0
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const char g_nshgreeting[] = "\nNuttShell (NSH) NuttX-" CONFIG_VERSION_STRING "\n";
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#else
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const char g_nshgreeting[] = "\nNuttShell (NSH)\n";
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#endif
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/* Telnet login prompts */
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#if defined(CONFIG_NSH_TELNET_LOGIN) && defined(CONFIG_NSH_TELNET)
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const char g_telnetgreeting[] = "\nWelcome to NuttShell(NSH) Telnet Server...\n";
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const char g_userprompt[] = "login: ";
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const char g_passwordprompt[] = "password: ";
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const char g_loginsuccess[] = "\nUser Logged-in!\n";
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const char g_badcredentials[] = "\nInvalid username or password\n";
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const char g_loginfailure[] = "Login failed!\n";
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#endif
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/* The NSH prompt */
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const char g_nshprompt[] = "nsh> ";
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/* Common, message formats */
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const char g_nshsyntax[] = "nsh: %s: syntax error\n";
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const char g_fmtargrequired[] = "nsh: %s: missing required argument(s)\n";
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const char g_fmtnomatching[] = "nsh: %s: no matching %s\n";
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const char g_fmtarginvalid[] = "nsh: %s: argument invalid\n";
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const char g_fmtargrange[] = "nsh: %s: value out of range\n";
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const char g_fmtcmdnotfound[] = "nsh: %s: command not found\n";
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const char g_fmtnosuch[] = "nsh: %s: no such %s: %s\n";
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const char g_fmttoomanyargs[] = "nsh: %s: too many arguments\n";
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const char g_fmtdeepnesting[] = "nsh: %s: nesting too deep\n";
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const char g_fmtcontext[] = "nsh: %s: not valid in this context\n";
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#ifdef CONFIG_NSH_STRERROR
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const char g_fmtcmdfailed[] = "nsh: %s: %s failed: %s\n";
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#else
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const char g_fmtcmdfailed[] = "nsh: %s: %s failed: %d\n";
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#endif
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const char g_fmtcmdoutofmemory[] = "nsh: %s: out of memory\n";
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const char g_fmtinternalerror[] = "nsh: %s: Internal error\n";
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#ifndef CONFIG_DISABLE_SIGNALS
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const char g_fmtsignalrecvd[] = "nsh: %s: Interrupted by signal\n";
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nsh_memlist_add
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****************************************************************************/
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#ifdef HAVE_MEMLIST
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static void nsh_memlist_add(FAR struct nsh_memlist_s *memlist,
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FAR char *allocation)
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{
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if (memlist && allocation)
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{
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int index = memlist->nallocs;
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if (index < CONFIG_NSH_MAXALLOCS)
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{
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memlist->allocations[index] = allocation;
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memlist->nallocs = index + 1;
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}
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}
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}
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#endif
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/****************************************************************************
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* Name: nsh_memlist_free
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****************************************************************************/
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#ifdef HAVE_MEMLIST
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static void nsh_memlist_free(FAR struct nsh_memlist_s *memlist)
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{
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if (memlist)
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{
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int index;
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for (index = 0; index < memlist->nallocs; index++)
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{
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free(memlist->allocations[index]);
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memlist->allocations[index] = NULL;
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}
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memlist->nallocs = 0;
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}
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}
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#endif
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/****************************************************************************
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* Name: nsh_releaseargs
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****************************************************************************/
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#ifndef CONFIG_NSH_DISABLEBG
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static void nsh_releaseargs(struct cmdarg_s *arg)
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{
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FAR struct nsh_vtbl_s *vtbl = arg->vtbl;
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int i;
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#if CONFIG_NFILE_STREAMS > 0
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/* If the output was redirected, then file descriptor should
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* be closed. The created task has its one, independent copy of
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* the file descriptor
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*/
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if (vtbl->np.np_redirect)
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{
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(void)close(arg->fd);
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}
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#endif
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/* Released the cloned vtbl instance */
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nsh_release(vtbl);
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/* Release the cloned args */
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for (i = 0; i < arg->argc; i++)
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{
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free(arg->argv[i]);
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}
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free(arg);
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}
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#endif
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/****************************************************************************
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* Name: nsh_child
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****************************************************************************/
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#ifndef CONFIG_NSH_DISABLEBG
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static pthread_addr_t nsh_child(pthread_addr_t arg)
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{
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struct cmdarg_s *carg = (struct cmdarg_s *)arg;
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int ret;
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dbg("BG %s\n", carg->argv[0]);
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/* Execute the specified command on the child thread */
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ret = nsh_command(carg->vtbl, carg->argc, carg->argv);
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/* Released the cloned arguments */
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dbg("BG %s complete\n", carg->argv[0]);
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nsh_releaseargs(carg);
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return (void*)ret;
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}
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#endif
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/****************************************************************************
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* Name: nsh_cloneargs
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****************************************************************************/
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#ifndef CONFIG_NSH_DISABLEBG
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static struct cmdarg_s *nsh_cloneargs(FAR struct nsh_vtbl_s *vtbl,
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int fd, int argc, char *argv[])
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{
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struct cmdarg_s *ret = (struct cmdarg_s *)zalloc(sizeof(struct cmdarg_s));
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int i;
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if (ret)
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{
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ret->vtbl = vtbl;
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ret->fd = fd;
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ret->argc = argc;
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for (i = 0; i < argc; i++)
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{
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ret->argv[i] = strdup(argv[i]);
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}
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}
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: nsh_saveresult
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****************************************************************************/
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static int nsh_saveresult(FAR struct nsh_vtbl_s *vtbl, bool result)
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{
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struct nsh_parser_s *np = &vtbl->np;
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#ifndef CONFIG_NSH_DISABLESCRIPT
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if (np->np_st[np->np_ndx].ns_state == NSH_PARSER_IF)
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{
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np->np_fail = false;
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np->np_st[np->np_ndx].ns_ifcond = result;
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return OK;
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}
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else
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#endif
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{
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np->np_fail = result;
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return result ? ERROR : OK;
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}
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}
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/****************************************************************************
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* Name: nsh_execute
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****************************************************************************/
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static int nsh_execute(FAR struct nsh_vtbl_s *vtbl,
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int argc, FAR char *argv[],
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FAR const char *redirfile, int oflags)
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{
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#if CONFIG_NFILE_STREAMS > 0 || !defined(CONFIG_NSH_DISABLEBG)
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int fd = -1;
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#endif
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int ret;
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/* Does this command correspond to an application filename?
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* nsh_fileapp() returns:
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*
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* -1 (ERROR) if the application task corresponding to 'argv[0]' could not
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* be started (possibly because it does not exist).
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* 0 (OK) if the application task corresponding to 'argv[0]' was
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* and successfully started. If CONFIG_SCHED_WAITPID is
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* defined, this return value also indicates that the
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* application returned successful status (EXIT_SUCCESS)
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* 1 If CONFIG_SCHED_WAITPID is defined, then this return value
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* indicates that the application task was spawned successfully
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* but returned failure exit status.
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*
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* Note the priority if not effected by nice-ness.
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*/
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#ifdef CONFIG_NSH_FILE_APPS
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ret = nsh_fileapp(vtbl, argv[0], argv, redirfile, oflags);
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if (ret >= 0)
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{
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/* nsh_fileapp() returned 0 or 1. This means that the built-in
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* command was successfully started (although it may not have ran
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* successfully). So certainly it is not an NSH command.
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*/
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/* Save the result: success if 0; failure if 1 */
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return nsh_saveresult(vtbl, ret != OK);
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}
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/* No, not a file name command (or, at least, we were unable to start a
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* program of that name). Maybe it is a built-in application or an NSH
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* command.
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*/
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#endif
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/* Does this command correspond to a built-in command?
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* nsh_builtin() returns:
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*
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* -1 (ERROR) if the application task corresponding to 'argv[0]' could not
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* be started (possibly because it doesn not exist).
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* 0 (OK) if the application task corresponding to 'argv[0]' was
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* and successfully started. If CONFIG_SCHED_WAITPID is
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* defined, this return value also indicates that the
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* application returned successful status (EXIT_SUCCESS)
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* 1 If CONFIG_SCHED_WAITPID is defined, then this return value
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* indicates that the application task was spawned successfully
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* but returned failure exit status.
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*
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* Note the priority if not effected by nice-ness.
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*/
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#if defined(CONFIG_NSH_BUILTIN_APPS) && (!defined(CONFIG_NSH_FILE_APPS) || !defined(CONFIG_FS_BINFS))
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#if CONFIG_NFILE_STREAMS > 0
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ret = nsh_builtin(vtbl, argv[0], argv, redirfile, oflags);
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#else
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ret = nsh_builtin(vtbl, argv[0], argv, NULL, 0);
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#endif
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if (ret >= 0)
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{
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/* nsh_builtin() returned 0 or 1. This means that the built-in
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* command was successfully started (although it may not have ran
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* successfully). So certainly it is not an NSH command.
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*/
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/* Save the result: success if 0; failure if 1 */
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return nsh_saveresult(vtbl, ret != OK);
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}
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/* No, not a built in command (or, at least, we were unable to start a
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* built-in command of that name). Treat it like an NSH command.
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*/
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#endif
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#if CONFIG_NFILE_STREAMS > 0
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/* Redirected output? */
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if (vtbl->np.np_redirect)
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{
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/* Open the redirection file. This file will eventually
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* be closed by a call to either nsh_release (if the command
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* is executed in the background) or by nsh_undirect if the
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* command is executed in the foreground.
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*/
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fd = open(redirfile, oflags, 0666);
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if (fd < 0)
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{
|
|
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, ¶m);
|
|
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, ¶m);
|
|
|
|
/* 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_NSH_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;
|
|
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, "${", "}");
|
|
return (FAR char *)g_nullstring;
|
|
}
|
|
|
|
/* Replace the right bracket with a NUL terminator and set the
|
|
* working pointer to the character after the bracket.
|
|
*/
|
|
|
|
*rptr = '\0';
|
|
working = rptr + 1;
|
|
}
|
|
else
|
|
{
|
|
/* Set working to the NUL terminator at the end of the string */
|
|
|
|
working = ptr + strlen(ptr);
|
|
}
|
|
|
|
/* Then get the value of the environment variable. On errors,
|
|
* nsh_envexpand will return the NULL string.
|
|
*/
|
|
|
|
envstr = nsh_envexpand(vtbl, ptr);
|
|
|
|
/* Concatenate the result of the operation with the accumulated
|
|
* string. On failures to allocation memory, nsh_strcat will
|
|
* just return value value of argument
|
|
*/
|
|
|
|
argument = nsh_strcat(vtbl, argument, envstr);
|
|
*allocation = argument;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#else
|
|
static FAR char *nsh_argexpand(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline,
|
|
FAR char **allocation)
|
|
{
|
|
FAR char *argument = (FAR char *)g_nullstring;
|
|
|
|
#ifdef CONFIG_NSH_CMDPARMS
|
|
/* Are we being asked to use the output from another command or program
|
|
* as an input parameters for this command?
|
|
*/
|
|
|
|
if (*cmdline == '`')
|
|
{
|
|
/* Verify that the final character is also a backquote */
|
|
|
|
FAR char *rptr = strchr(cmdline + 1, '`');
|
|
if (!rptr || rptr[1] != '\0')
|
|
{
|
|
nsh_output(vtbl, g_fmtnomatching, "`", "`");
|
|
return (FAR char *)g_nullstring;
|
|
}
|
|
|
|
/* Replace the final backquote with a NUL terminator */
|
|
|
|
*rptr = '\0';
|
|
|
|
/* Then execute the command to get the paramter value */
|
|
|
|
argument = nsh_cmdparm(vtbl, cmdline + 1, allocation);
|
|
}
|
|
else
|
|
#endif
|
|
|
|
#ifndef CONFIG_DISABLE_ENVIRON
|
|
/* Check for references to environment variables */
|
|
|
|
if (*cmdline == '$')
|
|
{
|
|
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;
|
|
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;
|
|
}
|
|
|
|
/* 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_cmdenabled
|
|
****************************************************************************/
|
|
|
|
#ifndef CONFIG_NSH_DISABLESCRIPT
|
|
static 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 int nsh_ifthenelse(FAR struct nsh_vtbl_s *vtbl, FAR char **ppcmd,
|
|
FAR char **saveptr, FAR NSH_MEMLIST_TYPE *memlist)
|
|
{
|
|
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, memlist);
|
|
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, memlist);
|
|
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, memlist);
|
|
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, memlist);
|
|
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_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);
|
|
|
|
/* Handler if-then-else-fi */
|
|
|
|
#ifndef CONFIG_NSH_DISABLESCRIPT
|
|
if (nsh_ifthenelse(vtbl, &cmd, &saveptr, &memlist) != 0)
|
|
{
|
|
NSH_MEMLIST_FREE(&memlist);
|
|
return nsh_saveresult(vtbl, true);
|
|
}
|
|
#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
|
|
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 */
|
|
|
|
for (;;)
|
|
{
|
|
/* A command may be terminated with a newline character, the end of the
|
|
* line, or a semicolon. NOTE that the set of delimiting characters
|
|
* includes the quotation mark. We need to handle quotation marks here
|
|
* because a semicolon or newline character within a quoted string must
|
|
* be ignored.
|
|
*/
|
|
|
|
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 character
|
|
* was found. Anything after the newline character is ignored (there
|
|
* should not be anything.
|
|
*/
|
|
|
|
if (*ptr == '\0' || *ptr == '\n')
|
|
{
|
|
/* 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;
|
|
}
|
|
}
|
|
#endif
|
|
}
|