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d60d9f65 SS |
1 | /* histexpand.c -- history expansion. */ |
2 | ||
3 | /* Copyright (C) 1989, 1992 Free Software Foundation, Inc. | |
4 | ||
5 | This file contains the GNU History Library (the Library), a set of | |
6 | routines for managing the text of previously typed lines. | |
7 | ||
8 | The Library is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
1b17e766 | 10 | the Free Software Foundation; either version 2, or (at your option) |
d60d9f65 SS |
11 | any later version. |
12 | ||
13 | The Library is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | The GNU General Public License is often shipped with GNU software, and | |
19 | is generally kept in a file called COPYING or LICENSE. If you do not | |
20 | have a copy of the license, write to the Free Software Foundation, | |
1b17e766 | 21 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
d60d9f65 SS |
22 | |
23 | #define READLINE_LIBRARY | |
24 | ||
25 | #if defined (HAVE_CONFIG_H) | |
26 | # include <config.h> | |
27 | #endif | |
28 | ||
29 | #include <stdio.h> | |
30 | ||
31 | #if defined (HAVE_STDLIB_H) | |
32 | # include <stdlib.h> | |
33 | #else | |
34 | # include "ansi_stdlib.h" | |
35 | #endif /* HAVE_STDLIB_H */ | |
36 | ||
37 | #if defined (HAVE_UNISTD_H) | |
38 | # ifndef _MINIX | |
39 | # include <sys/types.h> | |
40 | # endif | |
41 | # include <unistd.h> | |
42 | #endif | |
43 | ||
44 | #if defined (HAVE_STRING_H) | |
45 | # include <string.h> | |
46 | #else | |
47 | # include <strings.h> | |
48 | #endif /* !HAVE_STRING_H */ | |
49 | ||
50 | #include "history.h" | |
51 | #include "histlib.h" | |
52 | ||
1b17e766 EZ |
53 | #include "rlshell.h" |
54 | #include "xmalloc.h" | |
55 | ||
d60d9f65 SS |
56 | #define HISTORY_WORD_DELIMITERS " \t\n;&()|<>" |
57 | #define HISTORY_QUOTE_CHARACTERS "\"'`" | |
58 | ||
59 | static char error_pointer; | |
60 | ||
61 | static char *subst_lhs; | |
62 | static char *subst_rhs; | |
63 | static int subst_lhs_len; | |
64 | static int subst_rhs_len; | |
65 | ||
1b17e766 EZ |
66 | static char *get_history_word_specifier __P((char *, char *, int *)); |
67 | static char *history_find_word __P((char *, int)); | |
d60d9f65 | 68 | |
1b17e766 | 69 | static char *quote_breaks __P((char *)); |
d60d9f65 SS |
70 | |
71 | /* Variables exported by this file. */ | |
72 | /* The character that represents the start of a history expansion | |
73 | request. This is usually `!'. */ | |
74 | char history_expansion_char = '!'; | |
75 | ||
76 | /* The character that invokes word substitution if found at the start of | |
77 | a line. This is usually `^'. */ | |
78 | char history_subst_char = '^'; | |
79 | ||
80 | /* During tokenization, if this character is seen as the first character | |
81 | of a word, then it, and all subsequent characters upto a newline are | |
82 | ignored. For a Bourne shell, this should be '#'. Bash special cases | |
83 | the interactive comment character to not be a comment delimiter. */ | |
84 | char history_comment_char = '\0'; | |
85 | ||
86 | /* The list of characters which inhibit the expansion of text if found | |
87 | immediately following history_expansion_char. */ | |
88 | char *history_no_expand_chars = " \t\n\r="; | |
89 | ||
90 | /* If set to a non-zero value, single quotes inhibit history expansion. | |
91 | The default is 0. */ | |
92 | int history_quotes_inhibit_expansion = 0; | |
93 | ||
94 | /* If set, this points to a function that is called to verify that a | |
95 | particular history expansion should be performed. */ | |
96 | Function *history_inhibit_expansion_function; | |
97 | ||
98 | /* **************************************************************** */ | |
99 | /* */ | |
100 | /* History Expansion */ | |
101 | /* */ | |
102 | /* **************************************************************** */ | |
103 | ||
104 | /* Hairy history expansion on text, not tokens. This is of general | |
105 | use, and thus belongs in this library. */ | |
106 | ||
107 | /* The last string searched for by a !?string? search. */ | |
108 | static char *search_string; | |
109 | ||
110 | /* The last string matched by a !?string? search. */ | |
111 | static char *search_match; | |
112 | ||
113 | /* Return the event specified at TEXT + OFFSET modifying OFFSET to | |
114 | point to after the event specifier. Just a pointer to the history | |
115 | line is returned; NULL is returned in the event of a bad specifier. | |
116 | You pass STRING with *INDEX equal to the history_expansion_char that | |
117 | begins this specification. | |
118 | DELIMITING_QUOTE is a character that is allowed to end the string | |
119 | specification for what to search for in addition to the normal | |
120 | characters `:', ` ', `\t', `\n', and sometimes `?'. | |
121 | So you might call this function like: | |
122 | line = get_history_event ("!echo:p", &index, 0); */ | |
123 | char * | |
124 | get_history_event (string, caller_index, delimiting_quote) | |
125 | char *string; | |
126 | int *caller_index; | |
127 | int delimiting_quote; | |
128 | { | |
129 | register int i; | |
130 | register char c; | |
131 | HIST_ENTRY *entry; | |
132 | int which, sign, local_index, substring_okay; | |
133 | Function *search_func; | |
134 | char *temp; | |
135 | ||
136 | /* The event can be specified in a number of ways. | |
137 | ||
138 | !! the previous command | |
139 | !n command line N | |
140 | !-n current command-line minus N | |
141 | !str the most recent command starting with STR | |
142 | !?str[?] | |
143 | the most recent command containing STR | |
144 | ||
145 | All values N are determined via HISTORY_BASE. */ | |
146 | ||
147 | i = *caller_index; | |
148 | ||
149 | if (string[i] != history_expansion_char) | |
150 | return ((char *)NULL); | |
151 | ||
152 | /* Move on to the specification. */ | |
153 | i++; | |
154 | ||
155 | sign = 1; | |
156 | substring_okay = 0; | |
157 | ||
158 | #define RETURN_ENTRY(e, w) \ | |
159 | return ((e = history_get (w)) ? e->line : (char *)NULL) | |
160 | ||
161 | /* Handle !! case. */ | |
162 | if (string[i] == history_expansion_char) | |
163 | { | |
164 | i++; | |
165 | which = history_base + (history_length - 1); | |
166 | *caller_index = i; | |
167 | RETURN_ENTRY (entry, which); | |
168 | } | |
169 | ||
170 | /* Hack case of numeric line specification. */ | |
171 | if (string[i] == '-') | |
172 | { | |
173 | sign = -1; | |
174 | i++; | |
175 | } | |
176 | ||
177 | if (_rl_digit_p (string[i])) | |
178 | { | |
179 | /* Get the extent of the digits and compute the value. */ | |
180 | for (which = 0; _rl_digit_p (string[i]); i++) | |
181 | which = (which * 10) + _rl_digit_value (string[i]); | |
182 | ||
183 | *caller_index = i; | |
184 | ||
185 | if (sign < 0) | |
186 | which = (history_length + history_base) - which; | |
187 | ||
188 | RETURN_ENTRY (entry, which); | |
189 | } | |
190 | ||
191 | /* This must be something to search for. If the spec begins with | |
192 | a '?', then the string may be anywhere on the line. Otherwise, | |
193 | the string must be found at the start of a line. */ | |
194 | if (string[i] == '?') | |
195 | { | |
196 | substring_okay++; | |
197 | i++; | |
198 | } | |
199 | ||
200 | /* Only a closing `?' or a newline delimit a substring search string. */ | |
201 | for (local_index = i; c = string[i]; i++) | |
202 | if ((!substring_okay && (whitespace (c) || c == ':' || | |
203 | (history_search_delimiter_chars && member (c, history_search_delimiter_chars)) || | |
204 | string[i] == delimiting_quote)) || | |
205 | string[i] == '\n' || | |
206 | (substring_okay && string[i] == '?')) | |
207 | break; | |
208 | ||
209 | which = i - local_index; | |
210 | temp = xmalloc (1 + which); | |
211 | if (which) | |
212 | strncpy (temp, string + local_index, which); | |
213 | temp[which] = '\0'; | |
214 | ||
215 | if (substring_okay && string[i] == '?') | |
216 | i++; | |
217 | ||
218 | *caller_index = i; | |
219 | ||
220 | #define FAIL_SEARCH() \ | |
221 | do { \ | |
222 | history_offset = history_length; free (temp) ; return (char *)NULL; \ | |
223 | } while (0) | |
224 | ||
225 | /* If there is no search string, try to use the previous search string, | |
226 | if one exists. If not, fail immediately. */ | |
227 | if (*temp == '\0' && substring_okay) | |
228 | { | |
229 | if (search_string) | |
230 | { | |
231 | free (temp); | |
232 | temp = savestring (search_string); | |
233 | } | |
234 | else | |
235 | FAIL_SEARCH (); | |
236 | } | |
237 | ||
238 | search_func = substring_okay ? history_search : history_search_prefix; | |
239 | while (1) | |
240 | { | |
241 | local_index = (*search_func) (temp, -1); | |
242 | ||
243 | if (local_index < 0) | |
244 | FAIL_SEARCH (); | |
245 | ||
246 | if (local_index == 0 || substring_okay) | |
247 | { | |
248 | entry = current_history (); | |
249 | history_offset = history_length; | |
250 | ||
251 | /* If this was a substring search, then remember the | |
252 | string that we matched for word substitution. */ | |
253 | if (substring_okay) | |
254 | { | |
255 | FREE (search_string); | |
256 | search_string = temp; | |
257 | ||
258 | FREE (search_match); | |
259 | search_match = history_find_word (entry->line, local_index); | |
260 | } | |
261 | else | |
262 | free (temp); | |
263 | ||
264 | return (entry->line); | |
265 | } | |
266 | ||
267 | if (history_offset) | |
268 | history_offset--; | |
269 | else | |
270 | FAIL_SEARCH (); | |
271 | } | |
272 | #undef FAIL_SEARCH | |
273 | #undef RETURN_ENTRY | |
274 | } | |
275 | ||
276 | /* Function for extracting single-quoted strings. Used for inhibiting | |
277 | history expansion within single quotes. */ | |
278 | ||
279 | /* Extract the contents of STRING as if it is enclosed in single quotes. | |
280 | SINDEX, when passed in, is the offset of the character immediately | |
281 | following the opening single quote; on exit, SINDEX is left pointing | |
282 | to the closing single quote. */ | |
283 | static void | |
284 | hist_string_extract_single_quoted (string, sindex) | |
285 | char *string; | |
286 | int *sindex; | |
287 | { | |
288 | register int i; | |
289 | ||
290 | for (i = *sindex; string[i] && string[i] != '\''; i++) | |
291 | ; | |
292 | ||
293 | *sindex = i; | |
294 | } | |
295 | ||
296 | static char * | |
297 | quote_breaks (s) | |
298 | char *s; | |
299 | { | |
300 | register char *p, *r; | |
301 | char *ret; | |
302 | int len = 3; | |
303 | ||
304 | for (p = s; p && *p; p++, len++) | |
305 | { | |
306 | if (*p == '\'') | |
307 | len += 3; | |
308 | else if (whitespace (*p) || *p == '\n') | |
309 | len += 2; | |
310 | } | |
311 | ||
312 | r = ret = xmalloc (len); | |
313 | *r++ = '\''; | |
314 | for (p = s; p && *p; ) | |
315 | { | |
316 | if (*p == '\'') | |
317 | { | |
318 | *r++ = '\''; | |
319 | *r++ = '\\'; | |
320 | *r++ = '\''; | |
321 | *r++ = '\''; | |
322 | p++; | |
323 | } | |
324 | else if (whitespace (*p) || *p == '\n') | |
325 | { | |
326 | *r++ = '\''; | |
327 | *r++ = *p++; | |
328 | *r++ = '\''; | |
329 | } | |
330 | else | |
331 | *r++ = *p++; | |
332 | } | |
333 | *r++ = '\''; | |
334 | *r = '\0'; | |
335 | return ret; | |
336 | } | |
337 | ||
338 | static char * | |
339 | hist_error(s, start, current, errtype) | |
340 | char *s; | |
341 | int start, current, errtype; | |
342 | { | |
343 | char *temp, *emsg; | |
344 | int ll, elen; | |
345 | ||
346 | ll = current - start; | |
347 | ||
348 | switch (errtype) | |
349 | { | |
350 | case EVENT_NOT_FOUND: | |
351 | emsg = "event not found"; | |
352 | elen = 15; | |
353 | break; | |
354 | case BAD_WORD_SPEC: | |
355 | emsg = "bad word specifier"; | |
356 | elen = 18; | |
357 | break; | |
358 | case SUBST_FAILED: | |
359 | emsg = "substitution failed"; | |
360 | elen = 19; | |
361 | break; | |
362 | case BAD_MODIFIER: | |
363 | emsg = "unrecognized history modifier"; | |
364 | elen = 29; | |
365 | break; | |
c862e87b JM |
366 | case NO_PREV_SUBST: |
367 | emsg = "no previous substitution"; | |
368 | elen = 24; | |
369 | break; | |
d60d9f65 SS |
370 | default: |
371 | emsg = "unknown expansion error"; | |
372 | elen = 23; | |
373 | break; | |
374 | } | |
375 | ||
376 | temp = xmalloc (ll + elen + 3); | |
377 | strncpy (temp, s + start, ll); | |
378 | temp[ll] = ':'; | |
379 | temp[ll + 1] = ' '; | |
380 | strcpy (temp + ll + 2, emsg); | |
381 | return (temp); | |
382 | } | |
383 | ||
384 | /* Get a history substitution string from STR starting at *IPTR | |
385 | and return it. The length is returned in LENPTR. | |
386 | ||
387 | A backslash can quote the delimiter. If the string is the | |
388 | empty string, the previous pattern is used. If there is | |
389 | no previous pattern for the lhs, the last history search | |
390 | string is used. | |
391 | ||
392 | If IS_RHS is 1, we ignore empty strings and set the pattern | |
393 | to "" anyway. subst_lhs is not changed if the lhs is empty; | |
394 | subst_rhs is allowed to be set to the empty string. */ | |
395 | ||
396 | static char * | |
397 | get_subst_pattern (str, iptr, delimiter, is_rhs, lenptr) | |
398 | char *str; | |
399 | int *iptr, delimiter, is_rhs, *lenptr; | |
400 | { | |
401 | register int si, i, j, k; | |
402 | char *s = (char *) NULL; | |
403 | ||
404 | i = *iptr; | |
405 | ||
406 | for (si = i; str[si] && str[si] != delimiter; si++) | |
407 | if (str[si] == '\\' && str[si + 1] == delimiter) | |
408 | si++; | |
409 | ||
410 | if (si > i || is_rhs) | |
411 | { | |
412 | s = xmalloc (si - i + 1); | |
413 | for (j = 0, k = i; k < si; j++, k++) | |
414 | { | |
415 | /* Remove a backslash quoting the search string delimiter. */ | |
416 | if (str[k] == '\\' && str[k + 1] == delimiter) | |
417 | k++; | |
418 | s[j] = str[k]; | |
419 | } | |
420 | s[j] = '\0'; | |
421 | if (lenptr) | |
422 | *lenptr = j; | |
423 | } | |
424 | ||
425 | i = si; | |
426 | if (str[i]) | |
427 | i++; | |
428 | *iptr = i; | |
429 | ||
430 | return s; | |
431 | } | |
432 | ||
433 | static void | |
434 | postproc_subst_rhs () | |
435 | { | |
436 | char *new; | |
437 | int i, j, new_size; | |
438 | ||
439 | new = xmalloc (new_size = subst_rhs_len + subst_lhs_len); | |
440 | for (i = j = 0; i < subst_rhs_len; i++) | |
441 | { | |
442 | if (subst_rhs[i] == '&') | |
443 | { | |
444 | if (j + subst_lhs_len >= new_size) | |
445 | new = xrealloc (new, (new_size = new_size * 2 + subst_lhs_len)); | |
446 | strcpy (new + j, subst_lhs); | |
447 | j += subst_lhs_len; | |
448 | } | |
449 | else | |
450 | { | |
451 | /* a single backslash protects the `&' from lhs interpolation */ | |
452 | if (subst_rhs[i] == '\\' && subst_rhs[i + 1] == '&') | |
453 | i++; | |
454 | if (j >= new_size) | |
455 | new = xrealloc (new, new_size *= 2); | |
456 | new[j++] = subst_rhs[i]; | |
457 | } | |
458 | } | |
459 | new[j] = '\0'; | |
460 | free (subst_rhs); | |
461 | subst_rhs = new; | |
462 | subst_rhs_len = j; | |
463 | } | |
464 | ||
465 | /* Expand the bulk of a history specifier starting at STRING[START]. | |
466 | Returns 0 if everything is OK, -1 if an error occurred, and 1 | |
467 | if the `p' modifier was supplied and the caller should just print | |
468 | the returned string. Returns the new index into string in | |
469 | *END_INDEX_PTR, and the expanded specifier in *RET_STRING. */ | |
470 | static int | |
471 | history_expand_internal (string, start, end_index_ptr, ret_string, current_line) | |
472 | char *string; | |
473 | int start, *end_index_ptr; | |
474 | char **ret_string; | |
475 | char *current_line; /* for !# */ | |
476 | { | |
477 | int i, n, starting_index; | |
478 | int substitute_globally, want_quotes, print_only; | |
479 | char *event, *temp, *result, *tstr, *t, c, *word_spec; | |
480 | int result_len; | |
481 | ||
482 | result = xmalloc (result_len = 128); | |
483 | ||
484 | i = start; | |
485 | ||
486 | /* If it is followed by something that starts a word specifier, | |
487 | then !! is implied as the event specifier. */ | |
488 | ||
489 | if (member (string[i + 1], ":$*%^")) | |
490 | { | |
491 | char fake_s[3]; | |
492 | int fake_i = 0; | |
493 | i++; | |
494 | fake_s[0] = fake_s[1] = history_expansion_char; | |
495 | fake_s[2] = '\0'; | |
496 | event = get_history_event (fake_s, &fake_i, 0); | |
497 | } | |
498 | else if (string[i + 1] == '#') | |
499 | { | |
500 | i += 2; | |
501 | event = current_line; | |
502 | } | |
503 | else | |
504 | { | |
505 | int quoted_search_delimiter = 0; | |
506 | ||
507 | /* If the character before this `!' is a double or single | |
508 | quote, then this expansion takes place inside of the | |
509 | quoted string. If we have to search for some text ("!foo"), | |
510 | allow the delimiter to end the search string. */ | |
511 | if (i && (string[i - 1] == '\'' || string[i - 1] == '"')) | |
512 | quoted_search_delimiter = string[i - 1]; | |
513 | event = get_history_event (string, &i, quoted_search_delimiter); | |
514 | } | |
515 | ||
516 | if (event == 0) | |
517 | { | |
518 | *ret_string = hist_error (string, start, i, EVENT_NOT_FOUND); | |
519 | free (result); | |
520 | return (-1); | |
521 | } | |
522 | ||
523 | /* If a word specifier is found, then do what that requires. */ | |
524 | starting_index = i; | |
525 | word_spec = get_history_word_specifier (string, event, &i); | |
526 | ||
527 | /* There is no such thing as a `malformed word specifier'. However, | |
528 | it is possible for a specifier that has no match. In that case, | |
529 | we complain. */ | |
530 | if (word_spec == (char *)&error_pointer) | |
531 | { | |
532 | *ret_string = hist_error (string, starting_index, i, BAD_WORD_SPEC); | |
533 | free (result); | |
534 | return (-1); | |
535 | } | |
536 | ||
537 | /* If no word specifier, than the thing of interest was the event. */ | |
538 | temp = word_spec ? savestring (word_spec) : savestring (event); | |
539 | FREE (word_spec); | |
540 | ||
541 | /* Perhaps there are other modifiers involved. Do what they say. */ | |
542 | want_quotes = substitute_globally = print_only = 0; | |
543 | starting_index = i; | |
544 | ||
545 | while (string[i] == ':') | |
546 | { | |
547 | c = string[i + 1]; | |
548 | ||
549 | if (c == 'g') | |
550 | { | |
551 | substitute_globally = 1; | |
552 | i++; | |
553 | c = string[i + 1]; | |
554 | } | |
555 | ||
556 | switch (c) | |
557 | { | |
558 | default: | |
559 | *ret_string = hist_error (string, i+1, i+2, BAD_MODIFIER); | |
560 | free (result); | |
561 | free (temp); | |
562 | return -1; | |
563 | ||
564 | case 'q': | |
565 | want_quotes = 'q'; | |
566 | break; | |
567 | ||
568 | case 'x': | |
569 | want_quotes = 'x'; | |
570 | break; | |
571 | ||
572 | /* :p means make this the last executed line. So we | |
573 | return an error state after adding this line to the | |
574 | history. */ | |
575 | case 'p': | |
576 | print_only++; | |
577 | break; | |
578 | ||
579 | /* :t discards all but the last part of the pathname. */ | |
580 | case 't': | |
581 | tstr = strrchr (temp, '/'); | |
582 | if (tstr) | |
583 | { | |
584 | tstr++; | |
585 | t = savestring (tstr); | |
586 | free (temp); | |
587 | temp = t; | |
588 | } | |
589 | break; | |
590 | ||
591 | /* :h discards the last part of a pathname. */ | |
592 | case 'h': | |
593 | tstr = strrchr (temp, '/'); | |
594 | if (tstr) | |
595 | *tstr = '\0'; | |
596 | break; | |
597 | ||
598 | /* :r discards the suffix. */ | |
599 | case 'r': | |
600 | tstr = strrchr (temp, '.'); | |
601 | if (tstr) | |
602 | *tstr = '\0'; | |
603 | break; | |
604 | ||
605 | /* :e discards everything but the suffix. */ | |
606 | case 'e': | |
607 | tstr = strrchr (temp, '.'); | |
608 | if (tstr) | |
609 | { | |
610 | t = savestring (tstr); | |
611 | free (temp); | |
612 | temp = t; | |
613 | } | |
614 | break; | |
615 | ||
616 | /* :s/this/that substitutes `that' for the first | |
617 | occurrence of `this'. :gs/this/that substitutes `that' | |
618 | for each occurrence of `this'. :& repeats the last | |
619 | substitution. :g& repeats the last substitution | |
620 | globally. */ | |
621 | ||
622 | case '&': | |
623 | case 's': | |
624 | { | |
625 | char *new_event, *t; | |
626 | int delimiter, failed, si, l_temp; | |
627 | ||
628 | if (c == 's') | |
629 | { | |
630 | if (i + 2 < (int)strlen (string)) | |
631 | delimiter = string[i + 2]; | |
632 | else | |
633 | break; /* no search delimiter */ | |
634 | ||
635 | i += 3; | |
636 | ||
637 | t = get_subst_pattern (string, &i, delimiter, 0, &subst_lhs_len); | |
638 | /* An empty substitution lhs with no previous substitution | |
639 | uses the last search string as the lhs. */ | |
640 | if (t) | |
641 | { | |
642 | FREE (subst_lhs); | |
643 | subst_lhs = t; | |
644 | } | |
645 | else if (!subst_lhs) | |
646 | { | |
647 | if (search_string && *search_string) | |
648 | { | |
649 | subst_lhs = savestring (search_string); | |
650 | subst_lhs_len = strlen (subst_lhs); | |
651 | } | |
652 | else | |
653 | { | |
654 | subst_lhs = (char *) NULL; | |
655 | subst_lhs_len = 0; | |
656 | } | |
657 | } | |
658 | ||
d60d9f65 SS |
659 | FREE (subst_rhs); |
660 | subst_rhs = get_subst_pattern (string, &i, delimiter, 1, &subst_rhs_len); | |
661 | ||
662 | /* If `&' appears in the rhs, it's supposed to be replaced | |
663 | with the lhs. */ | |
664 | if (member ('&', subst_rhs)) | |
665 | postproc_subst_rhs (); | |
666 | } | |
667 | else | |
668 | i += 2; | |
669 | ||
c862e87b JM |
670 | /* If there is no lhs, the substitution can't succeed. */ |
671 | if (subst_lhs_len == 0) | |
672 | { | |
673 | *ret_string = hist_error (string, starting_index, i, NO_PREV_SUBST); | |
674 | free (result); | |
675 | free (temp); | |
676 | return -1; | |
677 | } | |
678 | ||
d60d9f65 SS |
679 | l_temp = strlen (temp); |
680 | /* Ignore impossible cases. */ | |
681 | if (subst_lhs_len > l_temp) | |
682 | { | |
683 | *ret_string = hist_error (string, starting_index, i, SUBST_FAILED); | |
684 | free (result); | |
685 | free (temp); | |
686 | return (-1); | |
687 | } | |
688 | ||
689 | /* Find the first occurrence of THIS in TEMP. */ | |
690 | si = 0; | |
691 | for (failed = 1; (si + subst_lhs_len) <= l_temp; si++) | |
692 | if (STREQN (temp+si, subst_lhs, subst_lhs_len)) | |
693 | { | |
694 | int len = subst_rhs_len - subst_lhs_len + l_temp; | |
695 | new_event = xmalloc (1 + len); | |
696 | strncpy (new_event, temp, si); | |
697 | strncpy (new_event + si, subst_rhs, subst_rhs_len); | |
698 | strncpy (new_event + si + subst_rhs_len, | |
699 | temp + si + subst_lhs_len, | |
700 | l_temp - (si + subst_lhs_len)); | |
701 | new_event[len] = '\0'; | |
702 | free (temp); | |
703 | temp = new_event; | |
704 | ||
705 | failed = 0; | |
706 | ||
707 | if (substitute_globally) | |
708 | { | |
709 | si += subst_rhs_len; | |
710 | l_temp = strlen (temp); | |
711 | substitute_globally++; | |
712 | continue; | |
713 | } | |
714 | else | |
715 | break; | |
716 | } | |
717 | ||
718 | if (substitute_globally > 1) | |
719 | { | |
720 | substitute_globally = 0; | |
721 | continue; /* don't want to increment i */ | |
722 | } | |
723 | ||
724 | if (failed == 0) | |
725 | continue; /* don't want to increment i */ | |
726 | ||
727 | *ret_string = hist_error (string, starting_index, i, SUBST_FAILED); | |
728 | free (result); | |
729 | free (temp); | |
730 | return (-1); | |
731 | } | |
732 | } | |
733 | i += 2; | |
734 | } | |
735 | /* Done with modfiers. */ | |
736 | /* Believe it or not, we have to back the pointer up by one. */ | |
737 | --i; | |
738 | ||
739 | if (want_quotes) | |
740 | { | |
741 | char *x; | |
742 | ||
743 | if (want_quotes == 'q') | |
744 | x = single_quote (temp); | |
745 | else if (want_quotes == 'x') | |
746 | x = quote_breaks (temp); | |
747 | else | |
748 | x = savestring (temp); | |
749 | ||
750 | free (temp); | |
751 | temp = x; | |
752 | } | |
753 | ||
754 | n = strlen (temp); | |
755 | if (n >= result_len) | |
756 | result = xrealloc (result, n + 2); | |
757 | strcpy (result, temp); | |
758 | free (temp); | |
759 | ||
760 | *end_index_ptr = i; | |
761 | *ret_string = result; | |
762 | return (print_only); | |
763 | } | |
764 | ||
765 | /* Expand the string STRING, placing the result into OUTPUT, a pointer | |
766 | to a string. Returns: | |
767 | ||
768 | -1) If there was an error in expansion. | |
769 | 0) If no expansions took place (or, if the only change in | |
770 | the text was the de-slashifying of the history expansion | |
771 | character) | |
772 | 1) If expansions did take place | |
773 | 2) If the `p' modifier was given and the caller should print the result | |
774 | ||
775 | If an error ocurred in expansion, then OUTPUT contains a descriptive | |
776 | error message. */ | |
777 | ||
778 | #define ADD_STRING(s) \ | |
779 | do \ | |
780 | { \ | |
781 | int sl = strlen (s); \ | |
782 | j += sl; \ | |
783 | if (j >= result_len) \ | |
784 | { \ | |
785 | while (j >= result_len) \ | |
786 | result_len += 128; \ | |
787 | result = xrealloc (result, result_len); \ | |
788 | } \ | |
789 | strcpy (result + j - sl, s); \ | |
790 | } \ | |
791 | while (0) | |
792 | ||
793 | #define ADD_CHAR(c) \ | |
794 | do \ | |
795 | { \ | |
796 | if (j >= result_len - 1) \ | |
797 | result = xrealloc (result, result_len += 64); \ | |
798 | result[j++] = c; \ | |
799 | result[j] = '\0'; \ | |
800 | } \ | |
801 | while (0) | |
802 | ||
803 | int | |
804 | history_expand (hstring, output) | |
805 | char *hstring; | |
806 | char **output; | |
807 | { | |
808 | register int j; | |
809 | int i, r, l, passc, cc, modified, eindex, only_printing; | |
810 | char *string; | |
811 | ||
812 | /* The output string, and its length. */ | |
813 | int result_len; | |
814 | char *result; | |
815 | ||
816 | /* Used when adding the string. */ | |
817 | char *temp; | |
818 | ||
819 | /* Setting the history expansion character to 0 inhibits all | |
820 | history expansion. */ | |
821 | if (history_expansion_char == 0) | |
822 | { | |
823 | *output = savestring (hstring); | |
824 | return (0); | |
825 | } | |
826 | ||
827 | /* Prepare the buffer for printing error messages. */ | |
828 | result = xmalloc (result_len = 256); | |
829 | result[0] = '\0'; | |
830 | ||
831 | only_printing = modified = 0; | |
832 | l = strlen (hstring); | |
833 | ||
834 | /* Grovel the string. Only backslash and single quotes can quote the | |
835 | history escape character. We also handle arg specifiers. */ | |
836 | ||
837 | /* Before we grovel forever, see if the history_expansion_char appears | |
838 | anywhere within the text. */ | |
839 | ||
840 | /* The quick substitution character is a history expansion all right. That | |
841 | is to say, "^this^that^" is equivalent to "!!:s^this^that^", and in fact, | |
842 | that is the substitution that we do. */ | |
843 | if (hstring[0] == history_subst_char) | |
844 | { | |
845 | string = xmalloc (l + 5); | |
846 | ||
847 | string[0] = string[1] = history_expansion_char; | |
848 | string[2] = ':'; | |
849 | string[3] = 's'; | |
850 | strcpy (string + 4, hstring); | |
851 | l += 4; | |
852 | } | |
853 | else | |
854 | { | |
855 | string = hstring; | |
856 | /* If not quick substitution, still maybe have to do expansion. */ | |
857 | ||
858 | /* `!' followed by one of the characters in history_no_expand_chars | |
859 | is NOT an expansion. */ | |
860 | for (i = 0; string[i]; i++) | |
861 | { | |
862 | cc = string[i + 1]; | |
863 | /* The history_comment_char, if set, appearing that the beginning | |
864 | of a word signifies that the rest of the line should not have | |
865 | history expansion performed on it. | |
866 | Skip the rest of the line and break out of the loop. */ | |
867 | if (history_comment_char && string[i] == history_comment_char && | |
868 | (i == 0 || member (string[i - 1], HISTORY_WORD_DELIMITERS))) | |
869 | { | |
870 | while (string[i]) | |
871 | i++; | |
872 | break; | |
873 | } | |
874 | else if (string[i] == history_expansion_char) | |
875 | { | |
876 | if (!cc || member (cc, history_no_expand_chars)) | |
877 | continue; | |
878 | /* If the calling application has set | |
879 | history_inhibit_expansion_function to a function that checks | |
880 | for special cases that should not be history expanded, | |
881 | call the function and skip the expansion if it returns a | |
882 | non-zero value. */ | |
883 | else if (history_inhibit_expansion_function && | |
884 | (*history_inhibit_expansion_function) (string, i)) | |
885 | continue; | |
886 | else | |
887 | break; | |
888 | } | |
889 | /* XXX - at some point, might want to extend this to handle | |
890 | double quotes as well. */ | |
891 | else if (history_quotes_inhibit_expansion && string[i] == '\'') | |
892 | { | |
893 | /* If this is bash, single quotes inhibit history expansion. */ | |
894 | i++; | |
895 | hist_string_extract_single_quoted (string, &i); | |
896 | } | |
897 | else if (history_quotes_inhibit_expansion && string[i] == '\\') | |
898 | { | |
899 | /* If this is bash, allow backslashes to quote single | |
900 | quotes and the history expansion character. */ | |
901 | if (cc == '\'' || cc == history_expansion_char) | |
902 | i++; | |
903 | } | |
904 | } | |
905 | ||
906 | if (string[i] != history_expansion_char) | |
907 | { | |
908 | free (result); | |
909 | *output = savestring (string); | |
910 | return (0); | |
911 | } | |
912 | } | |
913 | ||
914 | /* Extract and perform the substitution. */ | |
915 | for (passc = i = j = 0; i < l; i++) | |
916 | { | |
917 | int tchar = string[i]; | |
918 | ||
919 | if (passc) | |
920 | { | |
921 | passc = 0; | |
922 | ADD_CHAR (tchar); | |
923 | continue; | |
924 | } | |
925 | ||
926 | if (tchar == history_expansion_char) | |
927 | tchar = -3; | |
928 | else if (tchar == history_comment_char) | |
929 | tchar = -2; | |
930 | ||
931 | switch (tchar) | |
932 | { | |
933 | default: | |
934 | ADD_CHAR (string[i]); | |
935 | break; | |
936 | ||
937 | case '\\': | |
938 | passc++; | |
939 | ADD_CHAR (tchar); | |
940 | break; | |
941 | ||
942 | case '\'': | |
943 | { | |
944 | /* If history_quotes_inhibit_expansion is set, single quotes | |
945 | inhibit history expansion. */ | |
946 | if (history_quotes_inhibit_expansion) | |
947 | { | |
948 | int quote, slen; | |
949 | ||
950 | quote = i++; | |
951 | hist_string_extract_single_quoted (string, &i); | |
952 | ||
953 | slen = i - quote + 2; | |
954 | temp = xmalloc (slen); | |
955 | strncpy (temp, string + quote, slen); | |
956 | temp[slen - 1] = '\0'; | |
957 | ADD_STRING (temp); | |
958 | free (temp); | |
959 | } | |
960 | else | |
961 | ADD_CHAR (string[i]); | |
962 | break; | |
963 | } | |
964 | ||
965 | case -2: /* history_comment_char */ | |
966 | if (i == 0 || member (string[i - 1], HISTORY_WORD_DELIMITERS)) | |
967 | { | |
968 | temp = xmalloc (l - i + 1); | |
969 | strcpy (temp, string + i); | |
970 | ADD_STRING (temp); | |
971 | free (temp); | |
972 | i = l; | |
973 | } | |
974 | else | |
975 | ADD_CHAR (string[i]); | |
976 | break; | |
977 | ||
978 | case -3: /* history_expansion_char */ | |
979 | cc = string[i + 1]; | |
980 | ||
981 | /* If the history_expansion_char is followed by one of the | |
982 | characters in history_no_expand_chars, then it is not a | |
983 | candidate for expansion of any kind. */ | |
984 | if (member (cc, history_no_expand_chars)) | |
985 | { | |
986 | ADD_CHAR (string[i]); | |
987 | break; | |
988 | } | |
989 | ||
990 | #if defined (NO_BANG_HASH_MODIFIERS) | |
991 | /* There is something that is listed as a `word specifier' in csh | |
992 | documentation which means `the expanded text to this point'. | |
993 | That is not a word specifier, it is an event specifier. If we | |
994 | don't want to allow modifiers with `!#', just stick the current | |
995 | output line in again. */ | |
996 | if (cc == '#') | |
997 | { | |
998 | if (result) | |
999 | { | |
1000 | temp = xmalloc (1 + strlen (result)); | |
1001 | strcpy (temp, result); | |
1002 | ADD_STRING (temp); | |
1003 | free (temp); | |
1004 | } | |
1005 | i++; | |
1006 | break; | |
1007 | } | |
1008 | #endif | |
1009 | ||
1010 | r = history_expand_internal (string, i, &eindex, &temp, result); | |
1011 | if (r < 0) | |
1012 | { | |
1013 | *output = temp; | |
1014 | free (result); | |
1015 | if (string != hstring) | |
1016 | free (string); | |
1017 | return -1; | |
1018 | } | |
1019 | else | |
1020 | { | |
1021 | if (temp) | |
1022 | { | |
1023 | modified++; | |
1024 | if (*temp) | |
1025 | ADD_STRING (temp); | |
1026 | free (temp); | |
1027 | } | |
1028 | only_printing = r == 1; | |
1029 | i = eindex; | |
1030 | } | |
1031 | break; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | *output = result; | |
1036 | if (string != hstring) | |
1037 | free (string); | |
1038 | ||
1039 | if (only_printing) | |
1040 | { | |
1041 | add_history (result); | |
1042 | return (2); | |
1043 | } | |
1044 | ||
1045 | return (modified != 0); | |
1046 | } | |
1047 | ||
1048 | /* Return a consed string which is the word specified in SPEC, and found | |
1049 | in FROM. NULL is returned if there is no spec. The address of | |
1050 | ERROR_POINTER is returned if the word specified cannot be found. | |
1051 | CALLER_INDEX is the offset in SPEC to start looking; it is updated | |
1052 | to point to just after the last character parsed. */ | |
1053 | static char * | |
1054 | get_history_word_specifier (spec, from, caller_index) | |
1055 | char *spec, *from; | |
1056 | int *caller_index; | |
1057 | { | |
1058 | register int i = *caller_index; | |
1059 | int first, last; | |
1060 | int expecting_word_spec = 0; | |
1061 | char *result; | |
1062 | ||
1063 | /* The range of words to return doesn't exist yet. */ | |
1064 | first = last = 0; | |
1065 | result = (char *)NULL; | |
1066 | ||
1067 | /* If we found a colon, then this *must* be a word specification. If | |
1068 | it isn't, then it is an error. */ | |
1069 | if (spec[i] == ':') | |
1070 | { | |
1071 | i++; | |
1072 | expecting_word_spec++; | |
1073 | } | |
1074 | ||
1075 | /* Handle special cases first. */ | |
1076 | ||
1077 | /* `%' is the word last searched for. */ | |
1078 | if (spec[i] == '%') | |
1079 | { | |
1080 | *caller_index = i + 1; | |
1081 | return (search_match ? savestring (search_match) : savestring ("")); | |
1082 | } | |
1083 | ||
1084 | /* `*' matches all of the arguments, but not the command. */ | |
1085 | if (spec[i] == '*') | |
1086 | { | |
1087 | *caller_index = i + 1; | |
1088 | result = history_arg_extract (1, '$', from); | |
1089 | return (result ? result : savestring ("")); | |
1090 | } | |
1091 | ||
1092 | /* `$' is last arg. */ | |
1093 | if (spec[i] == '$') | |
1094 | { | |
1095 | *caller_index = i + 1; | |
1096 | return (history_arg_extract ('$', '$', from)); | |
1097 | } | |
1098 | ||
1099 | /* Try to get FIRST and LAST figured out. */ | |
1100 | ||
1101 | if (spec[i] == '-') | |
1102 | first = 0; | |
1103 | else if (spec[i] == '^') | |
1104 | first = 1; | |
1105 | else if (_rl_digit_p (spec[i]) && expecting_word_spec) | |
1106 | { | |
1107 | for (first = 0; _rl_digit_p (spec[i]); i++) | |
1108 | first = (first * 10) + _rl_digit_value (spec[i]); | |
1109 | } | |
1110 | else | |
1111 | return ((char *)NULL); /* no valid `first' for word specifier */ | |
1112 | ||
1113 | if (spec[i] == '^' || spec[i] == '*') | |
1114 | { | |
1115 | last = (spec[i] == '^') ? 1 : '$'; /* x* abbreviates x-$ */ | |
1116 | i++; | |
1117 | } | |
1118 | else if (spec[i] != '-') | |
1119 | last = first; | |
1120 | else | |
1121 | { | |
1122 | i++; | |
1123 | ||
1124 | if (_rl_digit_p (spec[i])) | |
1125 | { | |
1126 | for (last = 0; _rl_digit_p (spec[i]); i++) | |
1127 | last = (last * 10) + _rl_digit_value (spec[i]); | |
1128 | } | |
1129 | else if (spec[i] == '$') | |
1130 | { | |
1131 | i++; | |
1132 | last = '$'; | |
1133 | } | |
1134 | else if (!spec[i] || spec[i] == ':') /* could be modifier separator */ | |
1135 | last = -1; /* x- abbreviates x-$ omitting word `$' */ | |
1136 | } | |
1137 | ||
1138 | *caller_index = i; | |
1139 | ||
1140 | if (last >= first || last == '$' || last < 0) | |
1141 | result = history_arg_extract (first, last, from); | |
1142 | ||
1143 | return (result ? result : (char *)&error_pointer); | |
1144 | } | |
1145 | ||
1146 | /* Extract the args specified, starting at FIRST, and ending at LAST. | |
1147 | The args are taken from STRING. If either FIRST or LAST is < 0, | |
1148 | then make that arg count from the right (subtract from the number of | |
1149 | tokens, so that FIRST = -1 means the next to last token on the line). | |
1150 | If LAST is `$' the last arg from STRING is used. */ | |
1151 | char * | |
1152 | history_arg_extract (first, last, string) | |
1153 | int first, last; | |
1154 | char *string; | |
1155 | { | |
1156 | register int i, len; | |
1157 | char *result; | |
1158 | int size, offset; | |
1159 | char **list; | |
1160 | ||
1161 | /* XXX - think about making history_tokenize return a struct array, | |
1162 | each struct in array being a string and a length to avoid the | |
1163 | calls to strlen below. */ | |
1164 | if ((list = history_tokenize (string)) == NULL) | |
1165 | return ((char *)NULL); | |
1166 | ||
1167 | for (len = 0; list[len]; len++) | |
1168 | ; | |
1169 | ||
1170 | if (last < 0) | |
1171 | last = len + last - 1; | |
1172 | ||
1173 | if (first < 0) | |
1174 | first = len + first - 1; | |
1175 | ||
1176 | if (last == '$') | |
1177 | last = len - 1; | |
1178 | ||
1179 | if (first == '$') | |
1180 | first = len - 1; | |
1181 | ||
1182 | last++; | |
1183 | ||
1184 | if (first >= len || last > len || first < 0 || last < 0 || first > last) | |
1185 | result = ((char *)NULL); | |
1186 | else | |
1187 | { | |
1188 | for (size = 0, i = first; i < last; i++) | |
1189 | size += strlen (list[i]) + 1; | |
1190 | result = xmalloc (size + 1); | |
1191 | result[0] = '\0'; | |
1192 | ||
1193 | for (i = first, offset = 0; i < last; i++) | |
1194 | { | |
1195 | strcpy (result + offset, list[i]); | |
1196 | offset += strlen (list[i]); | |
1197 | if (i + 1 < last) | |
1198 | { | |
1199 | result[offset++] = ' '; | |
1200 | result[offset] = 0; | |
1201 | } | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | for (i = 0; i < len; i++) | |
1206 | free (list[i]); | |
1207 | free (list); | |
1208 | ||
1209 | return (result); | |
1210 | } | |
1211 | ||
1212 | #define slashify_in_quotes "\\`\"$" | |
1213 | ||
1214 | /* Parse STRING into tokens and return an array of strings. If WIND is | |
1215 | not -1 and INDP is not null, we also want the word surrounding index | |
1216 | WIND. The position in the returned array of strings is returned in | |
1217 | *INDP. */ | |
1218 | static char ** | |
1219 | history_tokenize_internal (string, wind, indp) | |
1220 | char *string; | |
1221 | int wind, *indp; | |
1222 | { | |
1223 | char **result; | |
1224 | register int i, start, result_index, size; | |
1225 | int len, delimiter; | |
1226 | ||
1227 | /* Get a token, and stuff it into RESULT. The tokens are split | |
1228 | exactly where the shell would split them. */ | |
1229 | for (i = result_index = size = 0, result = (char **)NULL; string[i]; ) | |
1230 | { | |
1231 | delimiter = 0; | |
1232 | ||
1233 | /* Skip leading whitespace. */ | |
1234 | for (; string[i] && whitespace (string[i]); i++) | |
1235 | ; | |
1236 | if (string[i] == 0 || string[i] == history_comment_char) | |
1237 | return (result); | |
1238 | ||
1239 | start = i; | |
1240 | ||
1241 | if (member (string[i], "()\n")) | |
1242 | { | |
1243 | i++; | |
1244 | goto got_token; | |
1245 | } | |
1246 | ||
1247 | if (member (string[i], "<>;&|$")) | |
1248 | { | |
1249 | int peek = string[i + 1]; | |
1250 | ||
1251 | if (peek == string[i] && peek != '$') | |
1252 | { | |
1253 | if (peek == '<' && string[i + 2] == '-') | |
1254 | i++; | |
1255 | i += 2; | |
1256 | goto got_token; | |
1257 | } | |
1258 | else | |
1259 | { | |
1260 | if ((peek == '&' && (string[i] == '>' || string[i] == '<')) || | |
1261 | ((peek == '>') && (string[i] == '&')) || | |
1262 | ((peek == '(') && (string[i] == '$'))) | |
1263 | { | |
1264 | i += 2; | |
1265 | goto got_token; | |
1266 | } | |
1267 | } | |
1268 | if (string[i] != '$') | |
1269 | { | |
1270 | i++; | |
1271 | goto got_token; | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | /* Get word from string + i; */ | |
1276 | ||
1277 | if (member (string[i], HISTORY_QUOTE_CHARACTERS)) | |
1278 | delimiter = string[i++]; | |
1279 | ||
1280 | for (; string[i]; i++) | |
1281 | { | |
1282 | if (string[i] == '\\' && string[i + 1] == '\n') | |
1283 | { | |
1284 | i++; | |
1285 | continue; | |
1286 | } | |
1287 | ||
1288 | if (string[i] == '\\' && delimiter != '\'' && | |
1289 | (delimiter != '"' || member (string[i], slashify_in_quotes))) | |
1290 | { | |
1291 | i++; | |
1292 | continue; | |
1293 | } | |
1294 | ||
1295 | if (delimiter && string[i] == delimiter) | |
1296 | { | |
1297 | delimiter = 0; | |
1298 | continue; | |
1299 | } | |
1300 | ||
1301 | if (!delimiter && (member (string[i], HISTORY_WORD_DELIMITERS))) | |
1302 | break; | |
1303 | ||
1304 | if (!delimiter && member (string[i], HISTORY_QUOTE_CHARACTERS)) | |
1305 | delimiter = string[i]; | |
1306 | } | |
1307 | ||
1308 | got_token: | |
1309 | ||
1310 | /* If we are looking for the word in which the character at a | |
1311 | particular index falls, remember it. */ | |
1312 | if (indp && wind != -1 && wind >= start && wind < i) | |
1313 | *indp = result_index; | |
1314 | ||
1315 | len = i - start; | |
1316 | if (result_index + 2 >= size) | |
1317 | result = (char **)xrealloc (result, ((size += 10) * sizeof (char *))); | |
1318 | result[result_index] = xmalloc (1 + len); | |
1319 | strncpy (result[result_index], string + start, len); | |
1320 | result[result_index][len] = '\0'; | |
1321 | result[++result_index] = (char *)NULL; | |
1322 | } | |
1323 | ||
1324 | return (result); | |
1325 | } | |
1326 | ||
1327 | /* Return an array of tokens, much as the shell might. The tokens are | |
1328 | parsed out of STRING. */ | |
1329 | char ** | |
1330 | history_tokenize (string) | |
1331 | char *string; | |
1332 | { | |
1333 | return (history_tokenize_internal (string, -1, (int *)NULL)); | |
1334 | } | |
1335 | ||
1336 | /* Find and return the word which contains the character at index IND | |
1337 | in the history line LINE. Used to save the word matched by the | |
1338 | last history !?string? search. */ | |
1339 | static char * | |
1340 | history_find_word (line, ind) | |
1341 | char *line; | |
1342 | int ind; | |
1343 | { | |
1344 | char **words, *s; | |
1345 | int i, wind; | |
1346 | ||
1347 | words = history_tokenize_internal (line, ind, &wind); | |
1348 | if (wind == -1) | |
1349 | return ((char *)NULL); | |
1350 | s = words[wind]; | |
1351 | for (i = 0; i < wind; i++) | |
1352 | free (words[i]); | |
1353 | for (i = wind + 1; words[i]; i++) | |
1354 | free (words[i]); | |
1355 | free (words); | |
1356 | return s; | |
1357 | } |