15cddcdc40d197650a8896d934f14b9c7a8e22d9
[openocd.git] / src / helper / command.c
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * part of this file is taken from libcli (libcli.sourceforge.net) *
6 * Copyright (C) David Parrish (david@dparrish.com) *
7 * *
8 * This program is free software; you can redistribute it and/or modify *
9 * it under the terms of the GNU General Public License as published by *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
12 * *
13 * This program is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License *
19 * along with this program; if not, write to the *
20 * Free Software Foundation, Inc., *
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
22 ***************************************************************************/
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include "replacements.h"
28
29 #include "command.h"
30
31 #include "log.h"
32 #include "time_support.h"
33
34 #include <stdlib.h>
35 #include <string.h>
36 #include <ctype.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <unistd.h>
40
41 void command_print_help_line(command_context_t* context, struct command_s *command, int indent);
42
43 int handle_sleep_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
44 int handle_time_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
45
46 int build_unique_lengths(command_context_t *context, command_t *commands)
47 {
48 command_t *c, *p;
49
50 /* iterate through all commands */
51 for (c = commands; c; c = c->next)
52 {
53 /* find out how many characters are required to uniquely identify a command */
54 for (c->unique_len = 1; c->unique_len <= strlen(c->name); c->unique_len++)
55 {
56 int foundmatch = 0;
57
58 /* for every command, see if the current length is enough */
59 for (p = commands; p; p = p->next)
60 {
61 /* ignore the command itself */
62 if (c == p)
63 continue;
64
65 /* compare commands up to the current length */
66 if (strncmp(p->name, c->name, c->unique_len) == 0)
67 foundmatch++;
68 }
69
70 /* when none of the commands matched, we've found the minimum length required */
71 if (!foundmatch)
72 break;
73 }
74
75 /* if the current command has children, build the unique lengths for them */
76 if (c->children)
77 build_unique_lengths(context, c->children);
78 }
79
80 return ERROR_OK;
81 }
82
83 /* Avoid evaluating this each time we add a command. Reduces overhead from O(n^2) to O(n).
84 * Makes a difference on ARM7 types machines and is not observable on GHz machines.
85 */
86 static int unique_length_dirty = 1;
87
88 command_t* register_command(command_context_t *context, command_t *parent, char *name, int (*handler)(struct command_context_s *context, char* name, char** args, int argc), enum command_mode mode, char *help)
89 {
90 command_t *c, *p;
91 unique_length_dirty = 1;
92
93 if (!context || !name)
94 return NULL;
95
96 c = malloc(sizeof(command_t));
97
98 c->name = strdup(name);
99 c->parent = parent;
100 c->children = NULL;
101 c->handler = handler;
102 c->mode = mode;
103 if (help)
104 c->help = strdup(help);
105 else
106 c->help = NULL;
107 c->unique_len = 0;
108 c->next = NULL;
109
110 /* place command in tree */
111 if (parent)
112 {
113 if (parent->children)
114 {
115 /* find last child */
116 for (p = parent->children; p && p->next; p = p->next);
117 if (p)
118 p->next = c;
119 }
120 else
121 {
122 parent->children = c;
123 }
124 }
125 else
126 {
127 if (context->commands)
128 {
129 /* find last command */
130 for (p = context->commands; p && p->next; p = p->next);
131 if (p)
132 p->next = c;
133 }
134 else
135 {
136 context->commands = c;
137 }
138 }
139
140 return c;
141 }
142
143 int unregister_command(command_context_t *context, char *name)
144 {
145 unique_length_dirty = 1;
146
147 command_t *c, *p = NULL, *c2;
148
149 if ((!context) || (!name))
150 return ERROR_INVALID_ARGUMENTS;
151
152 /* find command */
153 for (c = context->commands; c; c = c->next)
154 {
155 if (strcmp(name, c->name) == 0)
156 {
157 /* unlink command */
158 if (p)
159 {
160 p->next = c->next;
161 }
162 else
163 {
164 context->commands = c->next;
165 }
166
167 /* unregister children */
168 if (c->children)
169 {
170 for (c2 = c->children; c2; c2 = c2->next)
171 {
172 free(c2->name);
173 if (c2->help)
174 free(c2->help);
175 free(c2);
176 }
177 }
178
179 /* delete command */
180 free(c->name);
181 if (c->help)
182 free(c->help);
183 free(c);
184 }
185
186 /* remember the last command for unlinking */
187 p = c;
188 }
189
190 return ERROR_OK;
191 }
192
193 int parse_line(char *line, char *words[], int max_words)
194 {
195 int nwords = 0;
196 char *p = line;
197 char *word_start = line;
198 int inquote = 0;
199
200 while (nwords < max_words - 1)
201 {
202 /* check if we reached
203 * a terminating NUL
204 * a matching closing quote character " or '
205 * we're inside a word but not a quote, and the current character is whitespace
206 */
207 if (!*p || *p == inquote || (word_start && !inquote && isspace(*p)))
208 {
209 /* we're inside a word or quote, and reached its end*/
210 if (word_start)
211 {
212 int len;
213 char *word_end=p;
214
215 /* This will handle extra whitespace within quotes */
216 while (isspace(*word_start)&&(word_start<word_end))
217 word_start++;
218 while (isspace(*(word_end-1))&&(word_start<word_end))
219 word_end--;
220 len = word_end - word_start;
221
222 if (len>0)
223 {
224 /* copy the word */
225 memcpy(words[nwords] = malloc(len + 1), word_start, len);
226 /* add terminating NUL */
227 words[nwords++][len] = 0;
228 }
229 }
230 /* we're done parsing the line */
231 if (!*p)
232 break;
233
234 /* skip over trailing quote or whitespace*/
235 if (inquote || isspace(*p))
236 p++;
237 while (isspace(*p))
238 p++;
239
240 inquote = 0;
241 word_start = 0;
242 }
243 else if (*p == '"' || *p == '\'')
244 {
245 /* we've reached the beginning of a quote */
246 inquote = *p++;
247 word_start = p;
248 }
249 else
250 {
251 /* we've reached the beginning of a new word */
252 if (!word_start)
253 word_start = p;
254
255 /* normal character, skip */
256 p++;
257 }
258 }
259
260 return nwords;
261 }
262
263 void command_print(command_context_t *context, char *format, ...)
264 {
265 char *buffer = NULL;
266 int n, size = 0;
267 char *p;
268
269 /* process format string */
270 for (;;)
271 {
272 va_list ap;
273 va_start(ap, format);
274 if (!buffer || (n = vsnprintf(buffer, size, format, ap)) >= size)
275 {
276 /* increase buffer until it fits the whole string */
277 if (!(p = realloc(buffer, size += 4096)))
278 {
279 /* gotta free up */
280 if (buffer)
281 free(buffer);
282 va_end(ap);
283 return;
284 }
285
286 buffer = p;
287
288 va_end(ap);
289 continue;
290 }
291 va_end(ap);
292 break;
293 }
294
295 /* vsnprintf failed */
296 if (n < 0)
297 {
298 if (buffer)
299 free(buffer);
300 return;
301 }
302
303 p = buffer;
304
305 /* process lines in buffer */
306 do {
307 char *next = strchr(p, '\n');
308
309 if (next)
310 *next++ = 0;
311
312 if (context->output_handler)
313 context->output_handler(context, p);
314
315 p = next;
316 } while (p);
317
318 if (buffer)
319 free(buffer);
320 }
321
322 int find_and_run_command(command_context_t *context, command_t *commands, char *words[], int num_words, int start_word)
323 {
324 command_t *c;
325
326 if (unique_length_dirty)
327 {
328 unique_length_dirty = 0;
329 /* update unique lengths */
330 build_unique_lengths(context, context->commands);
331 }
332
333 for (c = commands; c; c = c->next)
334 {
335 if (strncasecmp(c->name, words[start_word], c->unique_len))
336 continue;
337
338 if (strncasecmp(c->name, words[start_word], strlen(words[start_word])))
339 continue;
340
341 if ((context->mode == COMMAND_CONFIG) || (c->mode == COMMAND_ANY) || (c->mode == context->mode) )
342 {
343 if (!c->children)
344 {
345 if (!c->handler)
346 {
347 command_print(context, "No handler for command");
348 break;
349 }
350 else
351 {
352 int retval = c->handler(context, c->name, words + start_word + 1, num_words - start_word - 1);
353 if (retval == ERROR_COMMAND_SYNTAX_ERROR)
354 {
355 command_print(context, "Syntax error:");
356 command_print_help_line(context, c, 0);
357 }
358 return retval;
359 }
360 }
361 else
362 {
363 if (start_word == num_words - 1)
364 {
365 command_print(context, "Incomplete command");
366 break;
367 }
368 return find_and_run_command(context, c->children, words, num_words, start_word + 1);
369 }
370 }
371 }
372
373 command_print(context, "Command %s not found", words[start_word]);
374 return ERROR_OK;
375 }
376
377 int command_run_line(command_context_t *context, char *line)
378 {
379 int nwords;
380 char *words[128] = {0};
381 int retval;
382 int i;
383
384 if ((!context) || (!line))
385 return ERROR_INVALID_ARGUMENTS;
386
387 /* skip preceding whitespace */
388 while (isspace(*line))
389 line++;
390
391 /* empty line, ignore */
392 if (!*line)
393 return ERROR_OK;
394
395 /* ignore comments */
396 if (*line && (line[0] == '#'))
397 return ERROR_OK;
398
399 if (context->echo)
400 {
401 command_print(context, "%s", line);
402 }
403
404 nwords = parse_line(line, words, sizeof(words) / sizeof(words[0]));
405
406 if (nwords > 0)
407 retval = find_and_run_command(context, context->commands, words, nwords, 0);
408 else
409 return ERROR_INVALID_ARGUMENTS;
410
411 for (i = 0; i < nwords; i++)
412 free(words[i]);
413
414 return retval;
415 }
416
417 int command_run_file(command_context_t *context, FILE *file, enum command_mode mode)
418 {
419 int retval = ERROR_OK;
420 int old_command_mode;
421 char *buffer=malloc(4096);
422 if (buffer==NULL)
423 {
424 return ERROR_INVALID_ARGUMENTS;
425 }
426
427 old_command_mode = context->mode;
428 context->mode = mode;
429
430 while (fgets(buffer, 4096, file))
431 {
432 char *p;
433 char *cmd, *end;
434
435 /* stop processing line after a comment (#, !) or a LF, CR were encountered */
436 if ((p = strpbrk(buffer, "#!\r\n")))
437 *p = 0;
438
439 /* skip over leading whitespace */
440 cmd = buffer;
441 while (isspace(*cmd))
442 cmd++;
443
444 /* empty (all whitespace) line? */
445 if (!*cmd)
446 continue;
447
448 /* search the end of the current line, ignore trailing whitespace */
449 for (p = end = cmd; *p; p++)
450 if (!isspace(*p))
451 end = p;
452
453 /* terminate end */
454 *++end = 0;
455 if (strcasecmp(cmd, "quit") == 0)
456 break;
457
458 /* run line */
459 if ((retval = command_run_line(context, cmd)) == ERROR_COMMAND_CLOSE_CONNECTION)
460 break;
461 }
462
463 context->mode = old_command_mode;
464
465
466 free(buffer);
467
468 return retval;
469 }
470
471 void command_print_help_line(command_context_t* context, struct command_s *command, int indent)
472 {
473 command_t *c;
474 char indents[32] = {0};
475 char *help = "no help available";
476 char name_buf[64];
477 int i;
478
479 for (i = 0; i < indent; i+=2)
480 {
481 indents[i*2] = ' ';
482 indents[i*2+1] = '-';
483 }
484 indents[i*2] = 0;
485
486 if (command->help)
487 help = command->help;
488
489 snprintf(name_buf, 64, command->name);
490 strncat(name_buf, indents, 64);
491 command_print(context, "%20s\t%s", name_buf, help);
492
493 if (command->children)
494 {
495 for (c = command->children; c; c = c->next)
496 {
497 command_print_help_line(context, c, indent + 1);
498 }
499 }
500 }
501
502 int command_print_help(command_context_t* context, char* name, char** args, int argc)
503 {
504 command_t *c;
505
506 for (c = context->commands; c; c = c->next)
507 {
508 if (argc == 1)
509 {
510 if (strncasecmp(c->name, args[0], c->unique_len))
511 continue;
512
513 if (strncasecmp(c->name, args[0], strlen(args[0])))
514 continue;
515 }
516
517 command_print_help_line(context, c, 0);
518 }
519
520 return ERROR_OK;
521 }
522
523 void command_set_output_handler(command_context_t* context, int (*output_handler)(struct command_context_s *context, char* line), void *priv)
524 {
525 context->output_handler = output_handler;
526 context->output_handler_priv = priv;
527 }
528
529 command_context_t* copy_command_context(command_context_t* context)
530 {
531 command_context_t* copy_context = malloc(sizeof(command_context_t));
532
533 *copy_context = *context;
534
535 return copy_context;
536 }
537
538 int command_done(command_context_t *context)
539 {
540 free(context);
541 context = NULL;
542
543 return ERROR_OK;
544 }
545
546 command_context_t* command_init()
547 {
548 command_context_t* context = malloc(sizeof(command_context_t));
549
550 context->mode = COMMAND_EXEC;
551 context->commands = NULL;
552 context->current_target = 0;
553 context->echo = 0;
554 context->output_handler = NULL;
555 context->output_handler_priv = NULL;
556
557 register_command(context, NULL, "help", command_print_help,
558 COMMAND_EXEC, "display this help");
559
560 register_command(context, NULL, "sleep", handle_sleep_command,
561 COMMAND_ANY, "sleep for <n> milliseconds");
562
563 register_command(context, NULL, "time", handle_time_command,
564 COMMAND_ANY, "time <cmd + args> - execute <cmd + args> and print time it took");
565
566 return context;
567 }
568
569 /* sleep command sleeps for <n> miliseconds
570 * this is useful in target startup scripts
571 */
572 int handle_sleep_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
573 {
574 unsigned long duration = 0;
575
576 if (argc == 1)
577 {
578 duration = strtoul(args[0], NULL, 0);
579 usleep(duration * 1000);
580 }
581
582 return ERROR_OK;
583 }
584
585 int handle_time_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
586 {
587 if (argc<1)
588 return ERROR_COMMAND_SYNTAX_ERROR;
589
590 duration_t duration;
591 char *duration_text;
592 int retval;
593
594 duration_start_measure(&duration);
595
596 retval = find_and_run_command(cmd_ctx, cmd_ctx->commands, args, argc, 0);
597
598 duration_stop_measure(&duration, &duration_text);
599
600 float t=duration.duration.tv_sec;
601 t+=((float)duration.duration.tv_usec / 1000000.0);
602 command_print(cmd_ctx, "%s took %fs", args[0], t);
603
604 free(duration_text);
605
606 return retval;
607 }