Boot Linux faster!

Check our new training course

Boot Linux faster!

Check our new training course
and Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
/*
 * Copyright (c) 2015 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file
 * @brief Console handler implementation of shell.h API
 */


#include <zephyr.h>
#include <stdio.h>
#include <string.h>

#include <console/console.h>
#include <misc/printk.h>
#include <misc/util.h>

#ifdef CONFIG_UART_CONSOLE
#include <console/uart_console.h>
#endif
#ifdef CONFIG_TELNET_CONSOLE
#include <console/telnet_console.h>
#endif

#include <shell/shell.h>

#define ARGC_MAX 10
#define COMMAND_MAX_LEN 50
#define MODULE_NAME_MAX_LEN 20
/* additional chars are " >" (include '\0' )*/
#define PROMPT_SUFFIX 3
#define PROMPT_MAX_LEN (MODULE_NAME_MAX_LEN + PROMPT_SUFFIX)

/* command table is located in the dedicated memory segment (.shell_) */
extern struct shell_module __shell_cmd_start[];
extern struct shell_module __shell_cmd_end[];
#define NUM_OF_SHELL_ENTITIES (__shell_cmd_end - __shell_cmd_start)

static const char *prompt;
static char default_module_prompt[PROMPT_MAX_LEN];
static struct shell_module *default_module;

#define STACKSIZE CONFIG_CONSOLE_SHELL_STACKSIZE
static K_THREAD_STACK_DEFINE(stack, STACKSIZE);
static struct k_thread shell_thread;

#define MAX_CMD_QUEUED CONFIG_CONSOLE_SHELL_MAX_CMD_QUEUED
static struct console_input buf[MAX_CMD_QUEUED];

static struct k_fifo avail_queue;
static struct k_fifo cmds_queue;

static shell_cmd_function_t app_cmd_handler;
static shell_prompt_function_t app_prompt_handler;

static const char *get_prompt(void)
{
	if (app_prompt_handler) {
		const char *str;

		str = app_prompt_handler();
		if (str) {
			return str;
		}
	}

	if (default_module) {
		if (default_module->prompt) {
			const char *ret;

			ret = default_module->prompt();
			if (ret) {
				return ret;
			}
		}

		return default_module_prompt;
	}

	return prompt;
}

static void line_queue_init(void)
{
	int i;

	for (i = 0; i < MAX_CMD_QUEUED; i++) {
		k_fifo_put(&avail_queue, &buf[i]);
	}
}

static size_t line2argv(char *str, char *argv[], size_t size)
{
	size_t argc = 0;

	if (!strlen(str)) {
		return 0;
	}

	while (*str && *str == ' ') {
		str++;
	}

	if (!*str) {
		return 0;
	}

	argv[argc++] = str;

	while ((str = strchr(str, ' '))) {
		*str++ = '\0';

		while (*str && *str == ' ') {
			str++;
		}

		if (!*str) {
			break;
		}

		argv[argc++] = str;

		if (argc == size) {
			printk("Too many parameters (max %zu)\n", size - 1);
			return 0;
		}
	}

	/* keep it POSIX style where argv[argc] is required to be NULL */
	argv[argc] = NULL;

	return argc;
}

static struct shell_module *get_destination_module(const char *module_str)
{
	int i;

	for (i = 0; i < NUM_OF_SHELL_ENTITIES; i++) {
		if (!strncmp(module_str,
			     __shell_cmd_start[i].module_name,
			     MODULE_NAME_MAX_LEN)) {
			return &__shell_cmd_start[i];
		}
	}

	return NULL;
}

static int show_cmd_help(const struct shell_cmd *cmd, bool full)
{
	printk("Usage: %s %s\n", cmd->cmd_name, cmd->help ? cmd->help : "");

	if (full && cmd->desc) {
		printk("%s\n", cmd->desc);
	}

	return 0;
}

static void print_module_commands(struct shell_module *module)
{
	int i;

	printk("help\n");

	for (i = 0; module->commands[i].cmd_name; i++) {
		printk("%-28s %s\n",
		       module->commands[i].cmd_name,
		       module->commands[i].help ?
		       module->commands[i].help : "");
	}
}

static const struct shell_cmd *get_cmd(const struct shell_cmd cmds[],
				       const char *cmd_str)
{
	int i;

	for (i = 0; cmds[i].cmd_name; i++) {
		if (!strcmp(cmd_str, cmds[i].cmd_name)) {
			return &cmds[i];
		}
	}

	return NULL;
}

static const struct shell_cmd *get_mod_cmd(struct shell_module *module,
					   const char *cmd_str)
{
	return get_cmd(module->commands, cmd_str);
}

static int cmd_help(int argc, char *argv[])
{
	struct shell_module *module = default_module;

	/* help per command */
	if (argc > 1) {
		const struct shell_cmd *cmd;
		const char *cmd_str;

		module = get_destination_module(argv[1]);
		if (module) {
			if (argc == 2) {
				goto module_help;
			}

			cmd_str = argv[2];
		} else {
			cmd_str = argv[1];
			module = default_module;
		}

		if (!module) {
			printk("No help found for '%s'\n", cmd_str);
			return -EINVAL;
		}

		cmd = get_mod_cmd(module, cmd_str);
		if (cmd) {
			return show_cmd_help(cmd, true);
		} else {
			printk("Unknown command '%s'\n", cmd_str);
			return -EINVAL;
		}
	}

module_help:
	/* help per module */
	if (module) {
		print_module_commands(module);
		printk("\nEnter 'exit' to leave current module.\n");
	} else { /* help for all entities */
		int i;

		printk("Available modules:\n");
		for (i = 0; i < NUM_OF_SHELL_ENTITIES; i++) {
			printk("%s\n", __shell_cmd_start[i].module_name);
		}

		printk("\nTo select a module, enter 'select <module name>'.\n");
	}

	return 0;
}

static int set_default_module(const char *name)
{
	struct shell_module *module;

	if (strlen(name) > MODULE_NAME_MAX_LEN) {
		printk("Module name %s is too long, default is not changed\n",
			name);
		return -EINVAL;
	}

	module = get_destination_module(name);

	if (!module) {
		printk("Illegal module %s, default is not changed\n", name);
		return -EINVAL;
	}

	default_module = module;

	strncpy(default_module_prompt, name, MODULE_NAME_MAX_LEN);
	strcat(default_module_prompt, "> ");

	return 0;
}

static int cmd_select(int argc, char *argv[])
{
	if (argc == 1) {
		default_module = NULL;
		return 0;
	}

	return set_default_module(argv[1]);
}

static int cmd_exit(int argc, char *argv[])
{
	if (argc == 1) {
		default_module = NULL;
	}

	return 0;
}

static const struct shell_cmd *get_internal(const char *command)
{
	static const struct shell_cmd internal_commands[] = {
		{ "help", cmd_help, "[command]" },
		{ "select", cmd_select, "[module]" },
		{ "exit", cmd_exit, NULL },
		{ NULL },
	};

	return get_cmd(internal_commands, command);
}

int shell_exec(char *line)
{
	char *argv[ARGC_MAX + 1], **argv_start = argv;
	const struct shell_cmd *cmd;
	int argc, err;

	argc = line2argv(line, argv, ARRAY_SIZE(argv));
	if (!argc) {
		return -EINVAL;
	}

	cmd = get_internal(argv[0]);
	if (cmd) {
		goto done;
	}

	if (argc == 1 && !default_module) {
		printk("No module selected. Use 'select' or 'help'.\n");
		return -EINVAL;
	}

	if (default_module) {
		cmd = get_mod_cmd(default_module, argv[0]);
	}

	if (!cmd && argc > 1) {
		struct shell_module *module;

		module = get_destination_module(argv[0]);
		if (module) {
			cmd = get_mod_cmd(module, argv[1]);
			if (cmd) {
				argc--;
				argv_start++;
			}
		}
	}

	if (!cmd) {
		if (app_cmd_handler) {
			return app_cmd_handler(argc, argv);
		}

		printk("Unrecognized command: %s\n", argv[0]);
		printk("Type 'help' for list of available commands\n");
		return -EINVAL;
	}

done:
	err = cmd->cb(argc, argv_start);
	if (err < 0) {
		show_cmd_help(cmd, false);
	}

	return err;
}

static void shell(void *p1, void *p2, void *p3)
{
	ARG_UNUSED(p1);
	ARG_UNUSED(p2);
	ARG_UNUSED(p3);

	while (1) {
		struct console_input *cmd;

		printk("%s", get_prompt());

		cmd = k_fifo_get(&cmds_queue, K_FOREVER);

		shell_exec(cmd->line);

		k_fifo_put(&avail_queue, cmd);
	}
}

static struct shell_module *get_completion_module(char *str,
						  char **command_prefix)
{
	char dest_str[MODULE_NAME_MAX_LEN];
	struct shell_module *dest;
	char *start;

	/* remove ' ' at the beginning of the line */
	while (*str && *str == ' ') {
		str++;
	}

	if (!*str) {
		return NULL;
	}

	start = str;

	if (default_module) {
		dest = default_module;
		/* caller function already checks str len and put '\0' */
		*command_prefix = str;
	} else {
		dest = NULL;
	}

	/*
	 * In case of a default module: only one parameter is possible.
	 * Otherwise, only two parameters are possibles.
	 */
	str = strchr(str, ' ');
	if (default_module) {
		return str ? dest : NULL;
	}

	if (!str) {
		return NULL;
	}

	if ((str - start + 1) >= MODULE_NAME_MAX_LEN) {
		return NULL;
	}

	strncpy(dest_str, start, (str - start + 1));
	dest_str[str - start] = '\0';
	dest = get_destination_module(dest_str);
	if (!dest) {
		return NULL;
	}

	str++;

	/* caller func has already checked str len and put '\0' at the end */
	*command_prefix = str;
	str = strchr(str, ' ');

	/* only two parameters are possibles in case of no default module */
	return str ? dest : NULL;
}

static u8_t completion(char *line, u8_t len)
{
	const char *first_match = NULL;
	int common_chars = -1, space = 0;
	int i, command_len;
	const struct shell_module *module;
	char *command_prefix;

	if (len >= (MODULE_NAME_MAX_LEN + COMMAND_MAX_LEN - 1)) {
		return 0;
	}

	/*
	 * line to completion is not ended by '\0' as the line that gets from
	 * k_fifo_get function
	 */
	line[len] = '\0';
	module = get_completion_module(line, &command_prefix);
	if (!module) {
		return 0;
	}

	command_len = strlen(command_prefix);

	for (i = 0; module->commands[i].cmd_name; i++) {
		int j;

		if (strncmp(command_prefix,
			    module->commands[i].cmd_name, command_len)) {
			continue;
		}

		if (!first_match) {
			first_match = module->commands[i].cmd_name;
			continue;
		}

		/* more commands match, print first match */
		if (first_match && (common_chars < 0)) {
			printk("\n%s\n", first_match);
			common_chars = strlen(first_match);
		}

		/* cut common part of matching names */
		for (j = 0; j < common_chars; j++) {
			if (first_match[j] != module->commands[i].cmd_name[j]) {
				break;
			}
		}

		common_chars = j;

		printk("%s\n", module->commands[i].cmd_name);
	}

	/* no match, do nothing */
	if (!first_match) {
		return 0;
	}

	if (common_chars >= 0) {
		/* multiple match, restore prompt */
		printk("%s", get_prompt());
		printk("%s", line);
	} else {
		common_chars = strlen(first_match);
		space = 1;
	}

	/* complete common part */
	for (i = command_len; i < common_chars; i++) {
		printk("%c", first_match[i]);
		line[len++] = first_match[i];
	}

	/* for convenience add space after command */
	if (space) {
		printk(" ");
		line[len] = ' ';
	}

	return common_chars - command_len + space;
}


void shell_init(const char *str)
{
	k_fifo_init(&cmds_queue);
	k_fifo_init(&avail_queue);

	line_queue_init();

	prompt = str ? str : "";

	k_thread_create(&shell_thread, stack, STACKSIZE, shell, NULL, NULL,
			NULL, K_PRIO_COOP(7), 0, K_NO_WAIT);

	/* Register serial console handler */
#ifdef CONFIG_UART_CONSOLE
	uart_register_input(&avail_queue, &cmds_queue, completion);
#endif
#ifdef CONFIG_TELNET_CONSOLE
	telnet_register_input(&avail_queue, &cmds_queue, completion);
#endif
}

/** @brief Optionally register an app default cmd handler.
 *
 *  @param handler To be called if no cmd found in cmds registered with
 *  shell_init.
 */
void shell_register_app_cmd_handler(shell_cmd_function_t handler)
{
	app_cmd_handler = handler;
}

void shell_register_prompt_handler(shell_prompt_function_t handler)
{
	app_prompt_handler = handler;
}

void shell_register_default_module(const char *name)
{
	int err = set_default_module(name);

	if (!err) {
		printk("\n%s", default_module_prompt);
	}
}