shell.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file shell.c
* @brief Simple CLI shell code.
*
* @addtogroup SHELL
* @{
*/
#include <string.h>
#include "ch.h"
#include "hal.h"
#include "shell.h"
#include "chprintf.h"
/**
* @brief Shell termination event source.
*/
EventSource shell_terminated;
static char *_strtok(char *str, const char *delim, char **saveptr) {
char *token;
if (str)
*saveptr = str;
token = *saveptr;
if (!token)
return NULL;
token += strspn(token, delim);
*saveptr = strpbrk(token, delim);
if (*saveptr)
*(*saveptr)++ = '\0';
return *token ? token : NULL;
}
static void usage(BaseChannel *chp, char *p) {
chprintf(chp, "Usage: %s\r\n", p);
}
static void list_commands(BaseChannel *chp, const ShellCommand *scp) {
while (scp->sc_name != NULL) {
chprintf(chp, "%s ", scp->sc_name);
scp++;
}
}
static void cmd_info(BaseChannel *chp, int argc, char *argv[]) {
(void)argv;
if (argc > 0) {
usage(chp, "info");
return;
}
chprintf(chp, "Kernel: %s\r\n", CH_KERNEL_VERSION);
#ifdef CH_COMPILER_NAME
chprintf(chp, "Compiler: %s\r\n", CH_COMPILER_NAME);
#endif
chprintf(chp, "Architecture: %s\r\n", CH_ARCHITECTURE_NAME);
#ifdef CH_CORE_VARIANT_NAME
chprintf(chp, "Core Variant: %s\r\n", CH_CORE_VARIANT_NAME);
#endif
#ifdef CH_PORT_INFO
chprintf(chp, "Port Info: %s\r\n", CH_PORT_INFO);
#endif
#ifdef PLATFORM_NAME
chprintf(chp, "Platform: %s\r\n", PLATFORM_NAME);
#endif
#ifdef BOARD_NAME
chprintf(chp, "Board: %s\r\n", BOARD_NAME);
#endif
#ifdef __DATE__
#ifdef __TIME__
chprintf(chp, "Build time: %s%s%s\r\n", __DATE__, " - ", __TIME__);
#endif
#endif
}
static void cmd_systime(BaseChannel *chp, int argc, char *argv[]) {
(void)argv;
if (argc > 0) {
usage(chp, "systime");
return;
}
chprintf(chp, "%lu\r\n", (unsigned long)chTimeNow());
}
/**
* @brief Array of the default commands.
*/
static ShellCommand local_commands[] = {
{"info", cmd_info},
{"systime", cmd_systime},
{NULL, NULL}
};
static bool_t cmdexec(const ShellCommand *scp, BaseChannel *chp,
char *name, int argc, char *argv[]) {
while (scp->sc_name != NULL) {
if (strcasecmp(scp->sc_name, name) == 0) {
scp->sc_function(chp, argc, argv);
return FALSE;
}
scp++;
}
return TRUE;
}
/**
* @brief Shell thread function.
*
* @param[in] p pointer to a @p BaseChannel object
* @return Termination reason.
* @retval RDY_OK terminated by command.
* @retval RDY_RESET terminated by reset condition on the I/O channel.
*/
static msg_t shell_thread(void *p) {
int n;
msg_t msg = RDY_OK;
BaseChannel *chp = ((ShellConfig *)p)->sc_channel;
const ShellCommand *scp = ((ShellConfig *)p)->sc_commands;
char *lp, *cmd, *tokp, line[SHELL_MAX_LINE_LENGTH];
char *args[SHELL_MAX_ARGUMENTS + 1];
chRegSetThreadName("shell");
chprintf(chp, "\r\nChibiOS/RT Shell\r\n");
while (TRUE) {
chprintf(chp, "ch> ");
if (shellGetLine(chp, line, sizeof(line))) {
chprintf(chp, "\r\nlogout");
break;
}
lp = _strtok(line, " \t", &tokp);
cmd = lp;
n = 0;
while ((lp = _strtok(NULL, " \t", &tokp)) != NULL) {
if (n >= SHELL_MAX_ARGUMENTS) {
chprintf(chp, "too many arguments\r\n");
cmd = NULL;
break;
}
args[n++] = lp;
}
args[n] = NULL;
if (cmd != NULL) {
if (strcasecmp(cmd, "exit") == 0) {
if (n > 0) {
usage(chp, "exit");
continue;
}
break;
}
else if (strcasecmp(cmd, "help") == 0) {
if (n > 0) {
usage(chp, "help");
continue;
}
chprintf(chp, "Commands: help exit ");
list_commands(chp, local_commands);
if (scp != NULL)
list_commands(chp, scp);
chprintf(chp, "\r\n");
}
else if (cmdexec(local_commands, chp, cmd, n, args) &&
((scp == NULL) || cmdexec(scp, chp, cmd, n, args))) {
chprintf(chp, "%s", cmd);
chprintf(chp, " ?\r\n");
}
}
}
/* Atomically broadcasting the event source and terminating the thread,
there is not a chSysUnlock() because the thread terminates upon return.*/
chSysLock();
chEvtBroadcastI(&shell_terminated);
chThdExitS(msg);
return 0; /* Never executed.*/
}
/**
* @brief Shell manager initialization.
*/
void shellInit(void) {
chEvtInit(&shell_terminated);
}
/**
* @brief Spawns a new shell.
* @pre @p CH_USE_MALLOC_HEAP and @p CH_USE_DYNAMIC must be enabled.
*
* @param[in] scp pointer to a @p ShellConfig object
* @param[in] size size of the shell working area to be allocated
* @param[in] prio priority level for the new shell
* @return A pointer to the shell thread.
* @retval NULL thread creation failed because memory allocation.
*/
#if CH_USE_HEAP && CH_USE_DYNAMIC
Thread *shellCreate(const ShellConfig *scp, size_t size, tprio_t prio) {
return chThdCreateFromHeap(NULL, size, prio, shell_thread, (void *)scp);
}
#endif
/**
* @brief Create statically allocated shell thread.
*
* @param[in] scp pointer to a @p ShellConfig object
* @param[in] wsp pointer to a working area dedicated to the shell thread stack
* @param[in] size size of the shell working area
* @param[in] prio priority level for the new shell
* @return A pointer to the shell thread.
*/
Thread *shellCreateStatic(const ShellConfig *scp, void *wsp,
size_t size, tprio_t prio) {
return chThdCreateStatic(wsp, size, prio, shell_thread, (void *)scp);
}
/**
* @brief Reads a whole line from the input channel.
*
* @param[in] chp pointer to a @p BaseChannel object
* @param[in] line pointer to the line buffer
* @param[in] size buffer maximum length
* @return The operation status.
* @retval TRUE the channel was reset or CTRL-D pressed.
* @retval FALSE operation successful.
*/
bool_t shellGetLine(BaseChannel *chp, char *line, unsigned size) {
char *p = line;
while (TRUE) {
short c = (short)chIOGet(chp);
if (c < 0)
return TRUE;
if (c == 4) {
chprintf(chp, "^D");
return TRUE;
}
if (c == 8) {
if (p != line) {
chIOPut(chp, (uint8_t)c);
chIOPut(chp, 0x20);
chIOPut(chp, (uint8_t)c);
p--;
}
continue;
}
if (c == '\r') {
chprintf(chp, "\r\n");
*p = 0;
return FALSE;
}
if (c < 0x20)
continue;
if (p < line + size - 1) {
chIOPut(chp, (uint8_t)c);
*p++ = (char)c;
}
}
}
/** @} */