Commit | Line | Data |
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04497f0b NW |
1 | /* Library for reading command lines and decoding commands. |
2 | Copyright (C) 1986, 1989 Free Software Foundation, Inc. | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 1, or (at your option) | |
7 | any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
17 | ||
18 | #include "command.h" | |
19 | #include "defs.h" | |
20 | #include <stdio.h> | |
21 | #include <ctype.h> | |
22 | ||
23 | extern char *xmalloc (); | |
24 | ||
25 | /* Add element named NAME to command list *LIST. | |
26 | FUN should be the function to execute the command; | |
27 | it will get a character string as argument, with leading | |
28 | and trailing blanks already eliminated. | |
29 | ||
30 | DOC is a documentation string for the command. | |
31 | Its first line should be a complete sentence. | |
32 | It should start with ? for a command that is an abbreviation | |
33 | or with * for a command that most users don't need to know about. */ | |
34 | ||
35 | struct cmd_list_element * | |
36 | add_cmd (name, class, fun, doc, list) | |
37 | char *name; | |
38 | int class; | |
39 | void (*fun) (); | |
40 | char *doc; | |
41 | struct cmd_list_element **list; | |
42 | { | |
43 | register struct cmd_list_element *c | |
44 | = (struct cmd_list_element *) xmalloc (sizeof (struct cmd_list_element)); | |
45 | ||
46 | delete_cmd (name, list); | |
47 | c->next = *list; | |
48 | c->name = savestring (name, strlen (name)); | |
49 | c->class = class; | |
50 | c->function = fun; | |
51 | c->doc = doc; | |
52 | c->prefixlist = 0; | |
53 | c->allow_unknown = 0; | |
54 | c->abbrev_flag = 0; | |
55 | c->aux = 0; | |
56 | *list = c; | |
57 | return c; | |
58 | } | |
59 | ||
60 | /* Same as above, except that the abbrev_flag is set. */ | |
61 | ||
62 | struct cmd_list_element * | |
63 | add_abbrev_cmd (name, class, fun, doc, list) | |
64 | char *name; | |
65 | int class; | |
66 | void (*fun) (); | |
67 | char *doc; | |
68 | struct cmd_list_element **list; | |
69 | { | |
70 | register struct cmd_list_element *c | |
71 | = (struct cmd_list_element *) xmalloc (sizeof (struct cmd_list_element)); | |
72 | ||
73 | delete_cmd (name, list); | |
74 | c->next = *list; | |
75 | c->name = savestring (name, strlen (name)); | |
76 | c->class = class; | |
77 | c->function = fun; | |
78 | c->doc = doc; | |
79 | c->prefixlist = 0; | |
80 | c->allow_unknown = 0; | |
81 | c->abbrev_flag = 1; | |
82 | c->aux = 0; | |
83 | *list = c; | |
84 | return c; | |
85 | } | |
86 | ||
87 | struct cmd_list_element * | |
88 | add_alias_cmd (name, oldname, class, abbrev_flag, list) | |
89 | char *name; | |
90 | char *oldname; | |
91 | int class; | |
92 | int abbrev_flag; | |
93 | struct cmd_list_element **list; | |
94 | { | |
95 | /* Must do this since lookup_cmd tries to side-effect its first arg */ | |
96 | char *copied_name; | |
97 | register struct cmd_list_element *old; | |
98 | register struct cmd_list_element *c; | |
99 | copied_name = (char *) alloca (strlen (oldname) + 1); | |
100 | strcpy (copied_name, oldname); | |
101 | old = lookup_cmd (&copied_name, *list, 0, 1, 1); | |
102 | ||
103 | if (old == 0) | |
104 | { | |
105 | delete_cmd (name, list); | |
106 | return 0; | |
107 | } | |
108 | ||
109 | c = add_cmd (name, class, old->function, old->doc, list); | |
110 | c->prefixlist = old->prefixlist; | |
111 | c->prefixname = old->prefixname; | |
112 | c->allow_unknown = old->allow_unknown; | |
113 | c->abbrev_flag = abbrev_flag; | |
114 | c->aux = old->aux; | |
115 | return c; | |
116 | } | |
117 | ||
118 | /* Like add_cmd but adds an element for a command prefix: | |
119 | a name that should be followed by a subcommand to be looked up | |
120 | in another command list. PREFIXLIST should be the address | |
121 | of the variable containing that list. */ | |
122 | ||
123 | struct cmd_list_element * | |
124 | add_prefix_cmd (name, class, fun, doc, prefixlist, prefixname, | |
125 | allow_unknown, list) | |
126 | char *name; | |
127 | int class; | |
128 | void (*fun) (); | |
129 | char *doc; | |
130 | struct cmd_list_element **prefixlist; | |
131 | char *prefixname; | |
132 | int allow_unknown; | |
133 | struct cmd_list_element **list; | |
134 | { | |
135 | register struct cmd_list_element *c = add_cmd (name, class, fun, doc, list); | |
136 | c->prefixlist = prefixlist; | |
137 | c->prefixname = prefixname; | |
138 | c->allow_unknown = allow_unknown; | |
139 | return c; | |
140 | } | |
141 | ||
142 | /* Like add_prefix_cmd butsets the abbrev_flag on the new command. */ | |
143 | ||
144 | struct cmd_list_element * | |
145 | add_abbrev_prefix_cmd (name, class, fun, doc, prefixlist, prefixname, | |
146 | allow_unknown, list) | |
147 | char *name; | |
148 | int class; | |
149 | void (*fun) (); | |
150 | char *doc; | |
151 | struct cmd_list_element **prefixlist; | |
152 | char *prefixname; | |
153 | int allow_unknown; | |
154 | struct cmd_list_element **list; | |
155 | { | |
156 | register struct cmd_list_element *c = add_cmd (name, class, fun, doc, list); | |
157 | c->prefixlist = prefixlist; | |
158 | c->prefixname = prefixname; | |
159 | c->allow_unknown = allow_unknown; | |
160 | c->abbrev_flag = 1; | |
161 | return c; | |
162 | } | |
163 | ||
164 | /* Remove the command named NAME from the command list. */ | |
165 | ||
166 | void | |
167 | delete_cmd (name, list) | |
168 | char *name; | |
169 | struct cmd_list_element **list; | |
170 | { | |
171 | register struct cmd_list_element *c; | |
172 | ||
173 | while (*list && !strcmp ((*list)->name, name)) | |
174 | { | |
175 | *list = (*list)->next; | |
176 | } | |
177 | ||
178 | if (*list) | |
179 | for (c = *list; c->next;) | |
180 | { | |
181 | if (!strcmp (c->next->name, name)) | |
182 | c->next = c->next->next; | |
183 | else | |
184 | c = c->next; | |
185 | } | |
186 | } | |
187 | ||
188 | void help_cmd (), help_list (), help_cmd_list (); | |
189 | ||
190 | /* This command really has to deal with two things: | |
191 | * 1) I want documentation on *this string* (usually called by | |
192 | * "help commandname"). | |
193 | * 2) I want documentation on *this list* (usually called by | |
194 | * giving a command that requires subcommands. Also called by saying | |
195 | * just "help".) | |
196 | * | |
197 | * I am going to split this into two seperate comamnds, help_cmd and | |
198 | * help_list. | |
199 | */ | |
200 | ||
201 | void | |
202 | help_cmd (command, stream) | |
203 | char *command; | |
204 | FILE *stream; | |
205 | { | |
206 | struct cmd_list_element *c; | |
207 | extern struct cmd_list_element *cmdlist; | |
208 | ||
209 | if (!command) | |
210 | { | |
211 | help_list (cmdlist, "", -2, stream); | |
212 | return; | |
213 | } | |
214 | ||
215 | c = lookup_cmd (&command, cmdlist, "", 0, 0); | |
216 | ||
217 | if (c == 0) | |
218 | return; | |
219 | ||
220 | /* There are three cases here. | |
221 | If c->prefixlist is nonzer, we have a prefix command. | |
222 | Print its documentation, then list its subcommands. | |
223 | ||
224 | If c->function is nonzero, we really have a command. | |
225 | Print its documentation and return. | |
226 | ||
227 | If c->function is zero, we have a class name. | |
228 | Print its documentation (as if it were a command) | |
229 | and then set class to he number of this class | |
230 | so that the commands in the class will be listed. */ | |
231 | ||
232 | fputs_filtered (c->doc, stream); | |
233 | fputs_filtered ("\n", stream); | |
234 | ||
235 | if (c->prefixlist == 0 && c->function != 0) | |
236 | return; | |
237 | fprintf_filtered (stream, "\n"); | |
238 | ||
239 | /* If this is a prefix command, print it's subcommands */ | |
240 | if (c->prefixlist) | |
241 | help_list (*c->prefixlist, c->prefixname, -1, stream); | |
242 | ||
243 | /* If this is a class name, print all of the commands in the class */ | |
244 | if (c->function == 0) | |
245 | help_list (cmdlist, "", c->class, stream); | |
246 | } | |
247 | ||
248 | /* | |
249 | * Get a specific kind of help on a command list. | |
250 | * | |
251 | * LIST is the list. | |
252 | * CMDTYPE is the prefix to use in the title string. | |
253 | * CLASS is the class with which to list the nodes of this list (see | |
254 | * documentation for help_cmd_list below), As usual, -1 for | |
255 | * everything, -2 for just classes, and non-negative for only things | |
256 | * in a specific class. | |
257 | * and STREAM is the output stream on which to print things. | |
258 | * If you call this routine with a class >= 0, it recurses. | |
259 | */ | |
260 | void | |
261 | help_list (list, cmdtype, class, stream) | |
262 | struct cmd_list_element *list; | |
263 | char *cmdtype; | |
264 | int class; | |
265 | FILE *stream; | |
266 | { | |
267 | int len; | |
268 | char *cmdtype1, *cmdtype2; | |
269 | ||
270 | /* If CMDTYPE is "foo ", CMDTYPE1 gets " foo" and CMDTYPE2 gets "foo sub" */ | |
271 | len = strlen (cmdtype); | |
272 | cmdtype1 = (char *) alloca (len + 1); | |
273 | cmdtype1[0] = 0; | |
274 | cmdtype2 = (char *) alloca (len + 4); | |
275 | cmdtype2[0] = 0; | |
276 | if (len) | |
277 | { | |
278 | cmdtype1[0] = ' '; | |
279 | strncpy (cmdtype1 + 1, cmdtype, len - 1); | |
280 | cmdtype1[len] = 0; | |
281 | strncpy (cmdtype2, cmdtype, len - 1); | |
282 | strcpy (cmdtype2 + len - 1, " sub"); | |
283 | } | |
284 | ||
285 | if (class == -2) | |
286 | fprintf_filtered (stream, "List of classes of %scommands:\n\n", cmdtype2); | |
287 | else | |
288 | fprintf_filtered (stream, "List of %scommands:\n\n", cmdtype2); | |
289 | ||
290 | help_cmd_list (list, class, cmdtype, (class >= 0), stream); | |
291 | ||
292 | if (class == -2) | |
293 | fprintf_filtered (stream, "\n\ | |
294 | Type \"help%s\" followed by a class name for a list of commands in that class.", | |
295 | cmdtype1); | |
296 | ||
297 | fprintf_filtered (stream, "\n\ | |
298 | Type \"help%s\" followed by %scommand name for full documentation.\n\ | |
299 | Command name abbreviations are allowed if unambiguous.\n", | |
300 | cmdtype1, cmdtype2); | |
301 | } | |
302 | ||
303 | ||
304 | /* | |
305 | * Implement a help command on command list LIST. | |
306 | * RECURSE should be non-zero if this should be done recursively on | |
307 | * all sublists of LIST. | |
308 | * PREFIX is the prefix to print before each command name. | |
309 | * STREAM is the stream upon which the output should be written. | |
310 | * CLASS should be: | |
311 | * A non-negative class number to list only commands in that | |
312 | * class. | |
313 | * -1 to list all commands in list. | |
314 | * -2 to list all classes in list. | |
315 | * | |
316 | * Note that RECURSE will be active on *all* sublists, not just the | |
317 | * ones seclected by the criteria above (ie. the selection mechanism | |
318 | * is at the low level, not the high-level). | |
319 | */ | |
320 | void | |
321 | help_cmd_list (list, class, prefix, recurse, stream) | |
322 | struct cmd_list_element *list; | |
323 | int class; | |
324 | char *prefix; | |
325 | int recurse; | |
326 | FILE *stream; | |
327 | { | |
328 | register struct cmd_list_element *c; | |
329 | register char *p; | |
330 | static char *line_buffer = 0; | |
331 | static int line_size; | |
332 | ||
333 | if (!line_buffer) | |
334 | { | |
335 | line_size = 80; | |
336 | line_buffer = (char *) xmalloc (line_size); | |
337 | } | |
338 | ||
339 | for (c = list; c; c = c->next) | |
340 | { | |
341 | if (c->abbrev_flag == 0 && | |
342 | (class == -1 | |
343 | || (class == -2 && c->function == 0) | |
344 | || (class == c->class && c->function != 0))) | |
345 | { | |
346 | fprintf_filtered (stream, "%s%s -- ", prefix, c->name); | |
347 | /* Print just the first line */ | |
348 | p = c->doc; | |
349 | while (*p && *p != '\n') p++; | |
350 | if (p - c->doc > line_size - 1) | |
351 | { | |
352 | line_size = p - c->doc + 1; | |
353 | free (line_buffer); | |
354 | line_buffer = (char *) xmalloc (line_size); | |
355 | } | |
356 | strncpy (line_buffer, c->doc, p - c->doc); | |
357 | line_buffer[p - c->doc] = '\0'; | |
358 | fputs_filtered (line_buffer, stream); | |
359 | fputs_filtered ("\n", stream); | |
360 | } | |
361 | if (recurse | |
362 | && c->prefixlist != 0 | |
363 | && c->abbrev_flag == 0) | |
364 | help_cmd_list (*c->prefixlist, class, c->prefixname, 1, stream); | |
365 | } | |
366 | } | |
367 | \f | |
368 | /* This routine takes a line of TEXT and a CLIST in which to | |
369 | start the lookup. When it returns it will have incremented the text | |
370 | pointer past the section of text it matched, set *RESULT_LIST to | |
371 | the list in which the last word was matched, and will return the | |
372 | cmd list element which the text matches. It will return 0 if no | |
373 | match at all was possible. It will return -1 if ambigous matches are | |
374 | possible; in this case *RESULT_LIST will be set to the list in which | |
375 | there are ambiguous choices (and text will be set to the ambiguous | |
376 | text string). | |
377 | ||
378 | It does no error reporting whatsoever; control will always return | |
379 | to the superior routine. | |
380 | ||
381 | In the case of an ambiguous return (-1), *RESULT_LIST will be set to | |
382 | point at the prefix_command (ie. the best match) *or* (special | |
383 | case) will be 0 if no prefix command was ever found. For example, | |
384 | in the case of "info a", "info" matches without ambiguity, but "a" | |
385 | could be "args" or "address", so *RESULT_LIST is set to | |
386 | the cmd_list_element for "info". So in this case | |
387 | result list should not be interpeted as a pointer to the beginning | |
388 | of a list; it simply points to a specific command. | |
389 | ||
390 | This routine does *not* modify the text pointed to by TEXT. | |
391 | ||
392 | If INGNORE_HELP_CLASSES is nonzero, ignore any command list | |
393 | elements which are actually help classes rather than commands (i.e. | |
394 | the function field of the struct cmd_list_element is 0). */ | |
395 | ||
396 | struct cmd_list_element * | |
397 | lookup_cmd_1 (text, clist, result_list, ignore_help_classes) | |
398 | char **text; | |
399 | struct cmd_list_element *clist, **result_list; | |
400 | int ignore_help_classes; | |
401 | { | |
402 | char *p, *command; | |
403 | int len, tmp, nfound; | |
404 | struct cmd_list_element *found, *c; | |
405 | ||
406 | while (**text == ' ' || **text == '\t') | |
407 | (*text)++; | |
408 | ||
409 | /* Treating underscores as part of command words is important | |
410 | so that "set args_foo()" doesn't get interpreted as | |
411 | "set args _foo()". */ | |
412 | for (p = *text; | |
413 | *p && (isalnum(*p) || *p == '-' || *p == '_'); | |
414 | p++) | |
415 | ; | |
416 | ||
417 | /* If nothing but whitespace, return 0. */ | |
418 | if (p == *text) | |
419 | return 0; | |
420 | ||
421 | len = p - *text; | |
422 | ||
423 | /* *text and p now bracket the first command word to lookup (and | |
424 | it's length is len). We copy this into a local temporary, | |
425 | converting to lower case as we go. */ | |
426 | ||
427 | command = (char *) alloca (len + 1); | |
428 | for (tmp = 0; tmp < len; tmp++) | |
429 | { | |
430 | char x = (*text)[tmp]; | |
431 | command[tmp] = (x >= 'A' && x <= 'Z') ? x - 'A' + 'a' : x; | |
432 | } | |
433 | command[len] = '\0'; | |
434 | ||
435 | /* Look it up. */ | |
436 | found = 0; | |
437 | nfound = 0; | |
438 | for (c = clist; c; c = c->next) | |
439 | if (!strncmp (command, c->name, len) | |
440 | && (!ignore_help_classes || c->function)) | |
441 | { | |
442 | found = c; | |
443 | nfound++; | |
444 | if (c->name[len] == '\0') | |
445 | { | |
446 | nfound = 1; | |
447 | break; | |
448 | } | |
449 | } | |
450 | ||
451 | /* If nothing matches, we have a simple failure. */ | |
452 | if (nfound == 0) | |
453 | return 0; | |
454 | ||
455 | if (nfound > 1) | |
456 | { | |
457 | *result_list = 0; /* Will be modified in calling routine | |
458 | if we know what the prefix command is. | |
459 | */ | |
460 | return (struct cmd_list_element *) -1; /* Ambiguous. */ | |
461 | } | |
462 | ||
463 | /* We've matched something on this list. Move text pointer forward. */ | |
464 | ||
465 | *text = p; | |
466 | if (found->prefixlist) | |
467 | { | |
468 | c = lookup_cmd_1 (text, *found->prefixlist, result_list, | |
469 | ignore_help_classes); | |
470 | if (!c) | |
471 | { | |
472 | /* Didn't find anything; this is as far as we got. */ | |
473 | *result_list = clist; | |
474 | return found; | |
475 | } | |
476 | else if (c == (struct cmd_list_element *) -1) | |
477 | { | |
478 | /* We've gotten this far properley, but the next step | |
479 | is ambiguous. We need to set the result list to the best | |
480 | we've found (if an inferior hasn't already set it). */ | |
481 | if (!*result_list) | |
482 | /* This used to say *result_list = *found->prefixlist | |
483 | If that was correct, need to modify the documentation | |
484 | at the top of this function to clarify what is supposed | |
485 | to be going on. */ | |
486 | *result_list = found; | |
487 | return c; | |
488 | } | |
489 | else | |
490 | { | |
491 | /* We matched! */ | |
492 | return c; | |
493 | } | |
494 | } | |
495 | else | |
496 | { | |
497 | *result_list = clist; | |
498 | return found; | |
499 | } | |
500 | } | |
501 | ||
502 | /* Look up the contents of *LINE as a command in the command list LIST. | |
503 | LIST is a chain of struct cmd_list_element's. | |
504 | If it is found, return the struct cmd_list_element for that command | |
505 | and update *LINE to point after the command name, at the first argument. | |
506 | If not found, call error if ALLOW_UNKNOWN is zero | |
507 | otherwise (or if error returns) return zero. | |
508 | Call error if specified command is ambiguous, | |
509 | unless ALLOW_UNKNOWN is negative. | |
510 | CMDTYPE precedes the word "command" in the error message. | |
511 | ||
512 | If INGNORE_HELP_CLASSES is nonzero, ignore any command list | |
513 | elements which are actually help classes rather than commands (i.e. | |
514 | the function field of the struct cmd_list_element is 0). */ | |
515 | ||
516 | struct cmd_list_element * | |
517 | lookup_cmd (line, list, cmdtype, allow_unknown, ignore_help_classes) | |
518 | char **line; | |
519 | struct cmd_list_element *list; | |
520 | char *cmdtype; | |
521 | int allow_unknown; | |
522 | int ignore_help_classes; | |
523 | { | |
524 | struct cmd_list_element *last_list = 0; | |
525 | struct cmd_list_element *c = | |
526 | lookup_cmd_1 (line, list, &last_list, ignore_help_classes); | |
527 | char *ptr = (*line) + strlen (*line) - 1; | |
528 | ||
529 | /* Clear off trailing whitespace. */ | |
530 | while (ptr >= *line && (*ptr == ' ' || *ptr == '\t')) | |
531 | ptr--; | |
532 | *(ptr + 1) = '\0'; | |
533 | ||
534 | if (!c) | |
535 | { | |
536 | if (!allow_unknown) | |
537 | { | |
538 | if (!*line) | |
539 | error ("Lack of needed %scommand", cmdtype); | |
540 | else | |
541 | { | |
542 | char *p = *line, *q; | |
543 | ||
544 | while (isalnum(*p) || *p == '-') | |
545 | p++; | |
546 | ||
547 | q = (char *) alloca (p - *line + 1); | |
548 | strncpy (q, *line, p - *line); | |
549 | q[p-*line] = '\0'; | |
550 | ||
551 | error ("Undefined %scommand: \"%s\".", cmdtype, q); | |
552 | } | |
553 | } | |
554 | else | |
555 | return 0; | |
556 | } | |
557 | else if (c == (struct cmd_list_element *) -1) | |
558 | { | |
559 | /* Ambigous. Local values should be off prefixlist or called | |
560 | values. */ | |
561 | int local_allow_unknown = (last_list ? last_list->allow_unknown : | |
562 | allow_unknown); | |
563 | char *local_cmdtype = last_list ? last_list->prefixname : cmdtype; | |
564 | struct cmd_list_element *local_list = | |
565 | (last_list ? *(last_list->prefixlist) : list); | |
566 | ||
567 | if (local_allow_unknown < 0) | |
568 | { | |
569 | if (last_list) | |
570 | return last_list; /* Found something. */ | |
571 | else | |
572 | return 0; /* Found nothing. */ | |
573 | } | |
574 | else | |
575 | { | |
576 | /* Report as error. */ | |
577 | int amb_len; | |
578 | char ambbuf[100]; | |
579 | ||
580 | for (amb_len = 0; | |
581 | ((*line)[amb_len] && (*line)[amb_len] != ' ' | |
582 | && (*line)[amb_len] != '\t'); | |
583 | amb_len++) | |
584 | ; | |
585 | ||
586 | ambbuf[0] = 0; | |
587 | for (c = local_list; c; c = c->next) | |
588 | if (!strncmp (*line, c->name, amb_len)) | |
589 | { | |
590 | if (strlen (ambbuf) + strlen (c->name) + 6 < sizeof ambbuf) | |
591 | { | |
592 | if (strlen (ambbuf)) | |
593 | strcat (ambbuf, ", "); | |
594 | strcat (ambbuf, c->name); | |
595 | } | |
596 | else | |
597 | { | |
598 | strcat (ambbuf, ".."); | |
599 | break; | |
600 | } | |
601 | } | |
602 | error ("Ambiguous %scommand \"%s\": %s.", local_cmdtype, | |
603 | *line, ambbuf); | |
604 | } | |
605 | } | |
606 | else | |
607 | { | |
608 | /* We've got something. It may still not be what the caller | |
609 | wants (if this command *needs* a subcommand). */ | |
610 | while (**line == ' ' || **line == '\t') | |
611 | (*line)++; | |
612 | ||
613 | if (c->prefixlist && **line && !c->allow_unknown) | |
614 | error ("Undefined %scommand: \"%s\".", c->prefixname, *line); | |
615 | ||
616 | /* Seems to be what he wants. Return it. */ | |
617 | return c; | |
618 | } | |
619 | } | |
620 | ||
621 | #if 0 | |
622 | /* Look up the contents of *LINE as a command in the command list LIST. | |
623 | LIST is a chain of struct cmd_list_element's. | |
624 | If it is found, return the struct cmd_list_element for that command | |
625 | and update *LINE to point after the command name, at the first argument. | |
626 | If not found, call error if ALLOW_UNKNOWN is zero | |
627 | otherwise (or if error returns) return zero. | |
628 | Call error if specified command is ambiguous, | |
629 | unless ALLOW_UNKNOWN is negative. | |
630 | CMDTYPE precedes the word "command" in the error message. */ | |
631 | ||
632 | struct cmd_list_element * | |
633 | lookup_cmd (line, list, cmdtype, allow_unknown) | |
634 | char **line; | |
635 | struct cmd_list_element *list; | |
636 | char *cmdtype; | |
637 | int allow_unknown; | |
638 | { | |
639 | register char *p; | |
640 | register struct cmd_list_element *c, *found; | |
641 | int nfound; | |
642 | char ambbuf[100]; | |
643 | char *processed_cmd; | |
644 | int i, cmd_len; | |
645 | ||
646 | /* Skip leading whitespace. */ | |
647 | ||
648 | while (**line == ' ' || **line == '\t') | |
649 | (*line)++; | |
650 | ||
651 | /* Clear out trailing whitespace. */ | |
652 | ||
653 | p = *line + strlen (*line); | |
654 | while (p != *line && (p[-1] == ' ' || p[-1] == '\t')) | |
655 | p--; | |
656 | *p = 0; | |
657 | ||
658 | /* Find end of command name. */ | |
659 | ||
660 | p = *line; | |
661 | while (*p == '-' | |
662 | || (*p >= 'a' && *p <= 'z') | |
663 | || (*p >= 'A' && *p <= 'Z') | |
664 | || (*p >= '0' && *p <= '9')) | |
665 | p++; | |
666 | ||
667 | /* Look up the command name. | |
668 | If exact match, keep that. | |
669 | Otherwise, take command abbreviated, if unique. Note that (in my | |
670 | opinion) a null string does *not* indicate ambiguity; simply the | |
671 | end of the argument. */ | |
672 | ||
673 | if (p == *line) | |
674 | { | |
675 | if (!allow_unknown) | |
676 | error ("Lack of needed %scommand", cmdtype); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | /* Copy over to a local buffer, converting to lowercase on the way. | |
681 | This is in case the command being parsed is a subcommand which | |
682 | doesn't match anything, and that's ok. We want the original | |
683 | untouched for the routine of the original command. */ | |
684 | ||
685 | processed_cmd = (char *) alloca (p - *line + 1); | |
686 | for (cmd_len = 0; cmd_len < p - *line; cmd_len++) | |
687 | { | |
688 | char x = (*line)[cmd_len]; | |
689 | if (x >= 'A' && x <= 'Z') | |
690 | processed_cmd[cmd_len] = x - 'A' + 'a'; | |
691 | else | |
692 | processed_cmd[cmd_len] = x; | |
693 | } | |
694 | processed_cmd[cmd_len] = '\0'; | |
695 | ||
696 | /* Check all possibilities in the current command list. */ | |
697 | found = 0; | |
698 | nfound = 0; | |
699 | for (c = list; c; c = c->next) | |
700 | { | |
701 | if (!strncmp (processed_cmd, c->name, cmd_len)) | |
702 | { | |
703 | found = c; | |
704 | nfound++; | |
705 | if (c->name[cmd_len] == 0) | |
706 | { | |
707 | nfound = 1; | |
708 | break; | |
709 | } | |
710 | } | |
711 | } | |
712 | ||
713 | /* Report error for undefined command name. */ | |
714 | ||
715 | if (nfound != 1) | |
716 | { | |
717 | if (nfound > 1 && allow_unknown >= 0) | |
718 | { | |
719 | ambbuf[0] = 0; | |
720 | for (c = list; c; c = c->next) | |
721 | if (!strncmp (processed_cmd, c->name, cmd_len)) | |
722 | { | |
723 | if (strlen (ambbuf) + strlen (c->name) + 6 < sizeof ambbuf) | |
724 | { | |
725 | if (strlen (ambbuf)) | |
726 | strcat (ambbuf, ", "); | |
727 | strcat (ambbuf, c->name); | |
728 | } | |
729 | else | |
730 | { | |
731 | strcat (ambbuf, ".."); | |
732 | break; | |
733 | } | |
734 | } | |
735 | error ("Ambiguous %scommand \"%s\": %s.", cmdtype, | |
736 | processed_cmd, ambbuf); | |
737 | } | |
738 | else if (!allow_unknown) | |
739 | error ("Undefined %scommand: \"%s\".", cmdtype, processed_cmd); | |
740 | return 0; | |
741 | } | |
742 | ||
743 | /* Skip whitespace before the argument. */ | |
744 | ||
745 | while (*p == ' ' || *p == '\t') p++; | |
746 | *line = p; | |
747 | ||
748 | if (found->prefixlist && *p) | |
749 | { | |
750 | c = lookup_cmd (line, *found->prefixlist, found->prefixname, | |
751 | found->allow_unknown); | |
752 | if (c) | |
753 | return c; | |
754 | } | |
755 | ||
756 | return found; | |
757 | } | |
758 | #endif | |
759 | ||
760 | /* Helper function for SYMBOL_COMPLETION_FUNCTION. */ | |
761 | ||
762 | /* Return a vector of char pointers which point to the different | |
763 | possible completions in LIST of TEXT. */ | |
764 | ||
765 | char ** | |
766 | complete_on_cmdlist (list, text) | |
767 | struct cmd_list_element *list; | |
768 | char *text; | |
769 | { | |
770 | struct cmd_list_element *ptr; | |
771 | char **matchlist; | |
772 | int sizeof_matchlist; | |
773 | int matches; | |
774 | int textlen = strlen (text); | |
775 | ||
776 | sizeof_matchlist = 10; | |
777 | matchlist = (char **) xmalloc (sizeof_matchlist * sizeof (char *)); | |
778 | matches = 0; | |
779 | ||
780 | for (ptr = list; ptr; ptr = ptr->next) | |
781 | if (!strncmp (ptr->name, text, textlen) | |
782 | && !ptr->abbrev_flag | |
783 | && (ptr->function | |
784 | || ptr->prefixlist)) | |
785 | { | |
786 | if (matches == sizeof_matchlist) | |
787 | { | |
788 | sizeof_matchlist *= 2; | |
789 | matchlist = (char **) xrealloc (matchlist, | |
790 | (sizeof_matchlist | |
791 | * sizeof (char *))); | |
792 | } | |
793 | ||
794 | matchlist[matches] = (char *) | |
795 | xmalloc (strlen (ptr->name) + 1); | |
796 | strcpy (matchlist[matches++], ptr->name); | |
797 | } | |
798 | ||
799 | if (matches == 0) | |
800 | { | |
801 | free (matchlist); | |
802 | matchlist = 0; | |
803 | } | |
804 | else | |
805 | { | |
806 | matchlist = (char **) xrealloc (matchlist, ((matches + 1) | |
807 | * sizeof (char *))); | |
808 | matchlist[matches] = (char *) 0; | |
809 | } | |
810 | ||
811 | return matchlist; | |
812 | } | |
813 | ||
814 | static void | |
815 | shell_escape (arg, from_tty) | |
816 | char *arg; | |
817 | int from_tty; | |
818 | { | |
819 | int rc, status, pid; | |
820 | char *p, *user_shell; | |
821 | extern char *rindex (); | |
822 | ||
823 | if ((user_shell = (char *) getenv ("SHELL")) == NULL) | |
824 | user_shell = "/bin/sh"; | |
825 | ||
826 | /* Get the name of the shell for arg0 */ | |
827 | if ((p = rindex (user_shell, '/')) == NULL) | |
828 | p = user_shell; | |
829 | else | |
830 | p++; /* Get past '/' */ | |
831 | ||
832 | if ((pid = fork()) == 0) | |
833 | { | |
834 | if (!arg) | |
835 | execl (user_shell, p, 0); | |
836 | else | |
837 | execl (user_shell, p, "-c", arg, 0); | |
838 | ||
839 | fprintf (stderr, "Exec of shell failed\n"); | |
840 | exit (0); | |
841 | } | |
842 | ||
843 | if (pid != -1) | |
844 | while ((rc = wait (&status)) != pid && rc != -1) | |
845 | ; | |
846 | else | |
847 | error ("Fork failed"); | |
848 | } | |
849 | ||
850 | void | |
851 | _initialize_command () | |
852 | { | |
853 | add_com ("shell", class_support, shell_escape, | |
854 | "Execute the rest of the line as a shell command. \n\ | |
855 | With no arguments, run an inferior shell."); | |
856 | } |