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605 lines
16 KiB
C
605 lines
16 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file shell.c
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* @brief Simple CLI shell code.
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*
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* @addtogroup SHELL
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* @{
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*/
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#include <string.h>
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#include "ch.h"
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#include "hal.h"
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#include "shell.h"
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#include "shell_cmd.h"
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#include "chprintf.h"
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/*===========================================================================*/
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/* Module local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module exported variables. */
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/*===========================================================================*/
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#if !defined(_CHIBIOS_NIL_) || defined(__DOXYGEN__)
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/**
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* @brief Shell termination event source.
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*/
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event_source_t shell_terminated;
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#endif
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/*===========================================================================*/
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/* Module local types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Module local functions. */
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/*===========================================================================*/
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static char *parse_arguments(char *str, char **saveptr) {
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char *p;
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if (str != NULL)
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*saveptr = str;
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p = *saveptr;
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if (!p) {
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return NULL;
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}
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/* Skipping white space.*/
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p += strspn(p, " \t");
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if (*p == '"') {
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/* If an argument starts with a double quote then its delimiter is another
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quote.*/
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p++;
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*saveptr = strpbrk(p, "\"");
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}
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else {
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/* The delimiter is white space.*/
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*saveptr = strpbrk(p, " \t");
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}
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/* Replacing the delimiter with a zero.*/
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if (*saveptr != NULL) {
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*(*saveptr)++ = '\0';
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}
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return *p != '\0' ? p : NULL;
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}
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static void list_commands(BaseSequentialStream *chp, const ShellCommand *scp) {
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while (scp->sc_name != NULL) {
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chprintf(chp, "%s ", scp->sc_name);
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scp++;
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}
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}
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static bool cmdexec(const ShellCommand *scp, BaseSequentialStream *chp,
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char *name, int argc, char *argv[]) {
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while (scp->sc_name != NULL) {
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if (strcmp(scp->sc_name, name) == 0) {
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scp->sc_function(chp, argc, argv);
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return false;
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}
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scp++;
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}
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return true;
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}
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#if (SHELL_USE_HISTORY == TRUE) || defined(__DOXYGEN__)
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static void del_histbuff_entry(ShellHistory *shp) {
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int pos = shp->sh_beg + *(shp->sh_buffer + shp->sh_beg) + 1;
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if (pos >= shp->sh_size)
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pos -= shp->sh_size;
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shp->sh_beg = pos;
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}
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static bool is_histbuff_space(ShellHistory *shp, int length) {
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if (shp->sh_end >= shp->sh_beg) {
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if (length < (shp->sh_size - (shp->sh_end - shp->sh_beg + 1)))
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return true;
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}
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else {
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if (length < (shp->sh_beg - shp->sh_end - 1))
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return true;
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}
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return false;
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}
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static void save_history(ShellHistory *shp, char *line, int length) {
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if (shp == NULL)
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return;
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if (length > shp->sh_size - 2)
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return;
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while ((*(line + length -1) == ' ') && (length > 0))
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length--;
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if (length <= 0)
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return;
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while (!is_histbuff_space(shp, length))
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del_histbuff_entry(shp);
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if (length < shp->sh_size - shp->sh_end - 1)
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memcpy(shp->sh_buffer + shp->sh_end + 1, line, length);
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else {
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/*
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* Since there isn't enough room left at the end of the buffer,
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* split the line to save up to the end of the buffer and then
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* wrap back to the beginning of the buffer.
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*/
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int part_len = shp->sh_size - shp->sh_end - 1;
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memcpy(shp->sh_buffer + shp->sh_end + 1, line, part_len);
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memcpy(shp->sh_buffer, line + part_len, length - part_len);
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}
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/* Save the length of the current line and move the buffer end pointer */
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*(shp->sh_buffer + shp->sh_end) = (char)length;
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shp->sh_end += length + 1;
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if (shp->sh_end >= shp->sh_size)
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shp->sh_end -= shp->sh_size;
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*(shp->sh_buffer + shp->sh_end) = 0;
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shp->sh_cur = 0;
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}
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static int get_history(ShellHistory *shp, char *line, int dir) {
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int count=0;
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if (shp == NULL)
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return -1;
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/* Count the number of lines saved in the buffer */
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int idx = shp->sh_beg;
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while (idx != shp->sh_end) {
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idx += *(shp->sh_buffer + idx) + 1;
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if (idx >= shp->sh_size)
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idx -= shp->sh_size;
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count++;
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}
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if (dir == SHELL_HIST_DIR_FW) {
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if (shp->sh_cur > 0)
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shp->sh_cur -= 2;
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else
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return 0;
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}
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if (count >= shp->sh_cur) {
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idx = shp->sh_beg;
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int i = 0;
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while (idx != shp->sh_end && shp->sh_cur != (count - i - 1)) {
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idx += *(shp->sh_buffer + idx) + 1;
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if (idx >= shp->sh_size)
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idx -= shp->sh_size;
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i++;
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}
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int length = *(shp->sh_buffer + idx);
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if (length > 0) {
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shp->sh_cur++;
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memset(line, 0, SHELL_MAX_LINE_LENGTH);
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if ((idx + length) < shp->sh_size) {
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memcpy(line, (shp->sh_buffer + idx + 1), length);
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}
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else {
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/*
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* Since the saved line was split at the end of the buffer,
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* get the line in two parts.
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*/
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int part_len = shp->sh_size - idx - 1;
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memcpy(line, shp->sh_buffer + idx + 1, part_len);
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memcpy(line + part_len, shp->sh_buffer, length - part_len);
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}
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return length;
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}
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else if (dir == SHELL_HIST_DIR_FW) {
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shp->sh_cur++;
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return 0;
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}
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}
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return -1;
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}
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#endif
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#if (SHELL_USE_COMPLETION == TRUE) || defined(__DOXYGEN__)
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static void get_completions(ShellConfig *scfg, char *line) {
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const ShellCommand *lcp = shell_local_commands;
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const ShellCommand *scp = scfg->sc_commands;
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char **scmp = scfg->sc_completion;
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char help_cmp[] = "help";
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if (strstr(help_cmp, line) == help_cmp) {
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*scmp++ = help_cmp;
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}
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while (lcp->sc_name != NULL) {
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if (strstr(lcp->sc_name, line) == lcp->sc_name) {
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*scmp++ = (char *)lcp->sc_name;
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}
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lcp++;
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}
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if (scp != NULL) {
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while (scp->sc_name != NULL) {
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if (strstr(scp->sc_name, line) == scp->sc_name) {
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*scmp++ = (char *)scp->sc_name;
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}
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scp++;
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}
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}
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*scmp = NULL;
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}
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static int process_completions(ShellConfig *scfg, char *line, int length, unsigned size) {
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char **scmp = scfg->sc_completion;
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char **cmp = scmp + 1;
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char *c = line + length;
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int clen = 0;
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if (*scmp != NULL) {
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if (*cmp == NULL) {
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clen = strlen(*scmp);
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int i = length;
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while ((c < line + clen) && (c < line + size - 1))
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*c++ = *(*scmp + i++);
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if (c < line + size -1) {
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*c = ' ';
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clen++;
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}
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}
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else {
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while (*(*scmp + clen) != 0) {
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while ((*(*scmp + clen) == *(*cmp + clen)) &&
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(*(*cmp + clen) != 0) && (*cmp != NULL)) {
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cmp++;
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}
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if (*cmp == NULL) {
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if ((c < line + size - 1) && (clen >= length))
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*c++ = *(*scmp + clen);
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cmp = scmp + 1;
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clen++;
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}
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else {
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break;
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}
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}
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}
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*(line + clen) = 0;
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}
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return clen;
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}
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static void write_completions(ShellConfig *scfg, char *line, int pos) {
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BaseSequentialStream *chp = scfg->sc_channel;
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char **scmp = scfg->sc_completion;
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if (*(scmp + 1) != NULL) {
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chprintf(chp, SHELL_NEWLINE_STR);
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while (*scmp != NULL)
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chprintf(chp, " %s", *scmp++);
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chprintf(chp, SHELL_NEWLINE_STR);
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chprintf(chp, SHELL_PROMPT_STR);
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chprintf(chp, "%s", line);
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}
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else {
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chprintf(chp, "%s", line + pos);
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}
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}
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#endif
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/*===========================================================================*/
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/* Module exported functions. */
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/*===========================================================================*/
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/**
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* @brief Shell thread function.
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*
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* @param[in] p pointer to a @p BaseSequentialStream object
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*/
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THD_FUNCTION(shellThread, p) {
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int n;
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ShellConfig *scfg = p;
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BaseSequentialStream *chp = scfg->sc_channel;
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const ShellCommand *scp = scfg->sc_commands;
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char *lp, *cmd, *tokp, line[SHELL_MAX_LINE_LENGTH];
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char *args[SHELL_MAX_ARGUMENTS + 1];
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#if !defined(_CHIBIOS_NIL_)
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chRegSetThreadName(SHELL_THREAD_NAME);
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#endif
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#if SHELL_USE_HISTORY == TRUE
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*(scfg->sc_histbuf) = 0;
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ShellHistory hist = {
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scfg->sc_histbuf,
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scfg->sc_histsize,
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0,
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0,
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0
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};
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ShellHistory *shp = &hist;
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#else
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ShellHistory *shp = NULL;
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#endif
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chprintf(chp, SHELL_NEWLINE_STR);
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chprintf(chp, "ChibiOS/RT Shell" SHELL_NEWLINE_STR);
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#if !defined(_CHIBIOS_NIL_)
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while (!chThdShouldTerminateX()) {
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#else
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while (true) {
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#endif
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chprintf(chp, SHELL_PROMPT_STR);
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if (shellGetLine(scfg, line, sizeof(line), shp)) {
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#if (SHELL_CMD_EXIT_ENABLED == TRUE) && !defined(_CHIBIOS_NIL_)
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chprintf(chp, SHELL_NEWLINE_STR);
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chprintf(chp, "logout");
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break;
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#else
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/* Putting a delay in order to avoid an endless loop trying to read
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an unavailable stream.*/
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osalThreadSleepMilliseconds(100);
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#endif
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}
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lp = parse_arguments(line, &tokp);
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cmd = lp;
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n = 0;
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while ((lp = parse_arguments(NULL, &tokp)) != NULL) {
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if (n >= SHELL_MAX_ARGUMENTS) {
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chprintf(chp, "too many arguments" SHELL_NEWLINE_STR);
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cmd = NULL;
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break;
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}
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args[n++] = lp;
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}
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args[n] = NULL;
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if (cmd != NULL) {
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if (strcmp(cmd, "help") == 0) {
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if (n > 0) {
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shellUsage(chp, "help");
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continue;
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}
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chprintf(chp, "Commands: help ");
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list_commands(chp, shell_local_commands);
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if (scp != NULL)
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list_commands(chp, scp);
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chprintf(chp, SHELL_NEWLINE_STR);
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}
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else if (cmdexec(shell_local_commands, chp, cmd, n, args) &&
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((scp == NULL) || cmdexec(scp, chp, cmd, n, args))) {
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chprintf(chp, "%s", cmd);
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chprintf(chp, " ?" SHELL_NEWLINE_STR);
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}
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}
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}
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#if !defined(_CHIBIOS_NIL_)
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shellExit(MSG_OK);
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#endif
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}
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/**
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* @brief Shell manager initialization.
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*
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* @api
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*/
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void shellInit(void) {
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#if !defined(_CHIBIOS_NIL_)
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chEvtObjectInit(&shell_terminated);
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#endif
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}
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#if !defined(_CHIBIOS_NIL_) || defined(__DOXYGEN__)
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/**
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* @brief Terminates the shell.
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* @note Must be invoked from the command handlers.
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* @note Does not return.
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*
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* @param[in] msg shell exit code
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*
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* @api
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*/
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void shellExit(msg_t msg) {
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/* Atomically broadcasting the event source and terminating the thread,
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there is not a chSysUnlock() because the thread terminates upon return.*/
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chSysLock();
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chEvtBroadcastI(&shell_terminated);
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chThdExitS(msg);
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}
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#endif
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/**
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* @brief Reads a whole line from the input channel.
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* @note Input chars are echoed on the same stream object with the
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* following exceptions:
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* - DEL and BS are echoed as BS-SPACE-BS.
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* - CR is echoed as CR-LF.
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* - 0x4 is echoed as "^D".
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* - Other values below 0x20 are not echoed.
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* .
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*
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* @param[in] scfg pointer to a @p ShellConfig object
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* @param[in] line pointer to the line buffer
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* @param[in] size buffer maximum length
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* @param[in] shp pointer to a @p ShellHistory object or NULL
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* @return The operation status.
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* @retval true the channel was reset or CTRL-D pressed.
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* @retval false operation successful.
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*
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* @api
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*/
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bool shellGetLine(ShellConfig *scfg, char *line, unsigned size, ShellHistory *shp) {
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char *p = line;
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BaseSequentialStream *chp = scfg->sc_channel;
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#if SHELL_USE_ESC_SEQ == TRUE
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bool escape = false;
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bool bracket = false;
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#endif
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#if SHELL_USE_HISTORY != TRUE
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(void) shp;
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#endif
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while (true) {
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char c;
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if (streamRead(chp, (uint8_t *)&c, 1) == 0)
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return true;
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#if SHELL_USE_ESC_SEQ == TRUE
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if (c == 27) {
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escape = true;
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continue;
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}
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if (escape) {
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escape = false;
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if (c == '[') {
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escape = true;
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bracket = true;
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continue;
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}
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if (bracket) {
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bracket = false;
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#if SHELL_USE_HISTORY == TRUE
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if (c == 'A') {
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int len = get_history(shp, line, SHELL_HIST_DIR_BK);
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if (len > 0) {
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_shell_reset_cur(chp);
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_shell_clr_line(chp);
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chprintf(chp, "%s", line);
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p = line + len;
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}
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continue;
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}
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if (c == 'B') {
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int len = get_history(shp, line, SHELL_HIST_DIR_FW);
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if (len == 0)
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*line = 0;
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if (len >= 0) {
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_shell_reset_cur(chp);
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_shell_clr_line(chp);
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chprintf(chp, "%s", line);
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p = line + len;
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}
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continue;
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}
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#endif
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}
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continue;
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}
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#endif
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#if (SHELL_CMD_EXIT_ENABLED == TRUE) && !defined(_CHIBIOS_NIL_)
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if (c == 4) {
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chprintf(chp, "^D");
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return true;
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}
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#endif
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if ((c == 8) || (c == 127)) {
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if (p != line) {
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streamPut(chp, 0x08);
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streamPut(chp, 0x20);
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streamPut(chp, 0x08);
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p--;
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}
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continue;
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}
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if (c == '\r') {
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chprintf(chp, SHELL_NEWLINE_STR);
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#if SHELL_USE_HISTORY == TRUE
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save_history(shp, line, p - line);
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#endif
|
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*p = 0;
|
|
return false;
|
|
}
|
|
#if SHELL_USE_COMPLETION == TRUE
|
|
if (c == '\t') {
|
|
if (p < line + size - 1) {
|
|
*p = 0;
|
|
|
|
get_completions(scfg, line);
|
|
int len = process_completions(scfg, line, p - line, size);
|
|
if (len > 0) {
|
|
write_completions(scfg, line, p - line);
|
|
p = line + len;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
#endif
|
|
#if SHELL_USE_HISTORY == TRUE
|
|
if (c == 14) {
|
|
int len = get_history(shp, line, SHELL_HIST_DIR_FW);
|
|
|
|
if (len == 0)
|
|
*line = 0;
|
|
|
|
if (len >= 0) {
|
|
_shell_reset_cur(chp);
|
|
_shell_clr_line(chp);
|
|
chprintf(chp, "%s", line);
|
|
p = line + len;
|
|
}
|
|
continue;
|
|
}
|
|
if (c == 16) {
|
|
int len = get_history(shp, line, SHELL_HIST_DIR_BK);
|
|
|
|
if (len > 0) {
|
|
_shell_reset_cur(chp);
|
|
_shell_clr_line(chp);
|
|
chprintf(chp, "%s", line);
|
|
p = line + len;
|
|
}
|
|
continue;
|
|
}
|
|
#endif
|
|
if (c < 0x20)
|
|
continue;
|
|
if (p < line + size - 1) {
|
|
streamPut(chp, c);
|
|
*p++ = (char)c;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** @} */
|