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ccc6cda3 JA |
1 | This file is pushd.def, from which is created pushd.c. It implements the |
2 | builtins "pushd", "popd", and "dirs" in Bash. | |
3 | ||
4 | Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GNU Bash, the Bourne Again SHell. | |
7 | ||
8 | Bash is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
bb70624e | 10 | Software Foundation; either version 2, or (at your option) any later |
ccc6cda3 JA |
11 | version. |
12 | ||
13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License along | |
19 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 20 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
ccc6cda3 JA |
21 | |
22 | $PRODUCES pushd.c | |
23 | ||
24 | $BUILTIN pushd | |
25 | $FUNCTION pushd_builtin | |
26 | $DEPENDS_ON PUSHD_AND_POPD | |
27 | $SHORT_DOC pushd [dir | +N | -N] [-n] | |
28 | Adds a directory to the top of the directory stack, or rotates | |
29 | the stack, making the new top of the stack the current working | |
30 | directory. With no arguments, exchanges the top two directories. | |
31 | ||
32 | +N Rotates the stack so that the Nth directory (counting | |
d166f048 JA |
33 | from the left of the list shown by `dirs', starting with |
34 | zero) is at the top. | |
ccc6cda3 JA |
35 | |
36 | -N Rotates the stack so that the Nth directory (counting | |
d166f048 JA |
37 | from the right of the list shown by `dirs', starting with |
38 | zero) is at the top. | |
ccc6cda3 JA |
39 | |
40 | -n suppress the normal change of directory when adding directories | |
41 | to the stack, so only the stack is manipulated. | |
42 | ||
43 | dir adds DIR to the directory stack at the top, making it the | |
44 | new current working directory. | |
45 | ||
46 | You can see the directory stack with the `dirs' command. | |
47 | $END | |
48 | ||
49 | $BUILTIN popd | |
50 | $FUNCTION popd_builtin | |
51 | $DEPENDS_ON PUSHD_AND_POPD | |
52 | $SHORT_DOC popd [+N | -N] [-n] | |
53 | Removes entries from the directory stack. With no arguments, | |
54 | removes the top directory from the stack, and cd's to the new | |
55 | top directory. | |
56 | ||
57 | +N removes the Nth entry counting from the left of the list | |
58 | shown by `dirs', starting with zero. For example: `popd +0' | |
59 | removes the first directory, `popd +1' the second. | |
60 | ||
61 | -N removes the Nth entry counting from the right of the list | |
62 | shown by `dirs', starting with zero. For example: `popd -0' | |
63 | removes the last directory, `popd -1' the next to last. | |
64 | ||
65 | -n suppress the normal change of directory when removing directories | |
66 | from the stack, so only the stack is manipulated. | |
67 | ||
68 | You can see the directory stack with the `dirs' command. | |
69 | $END | |
70 | ||
71 | $BUILTIN dirs | |
72 | $FUNCTION dirs_builtin | |
73 | $DEPENDS_ON PUSHD_AND_POPD | |
74 | $SHORT_DOC dirs [-clpv] [+N] [-N] | |
75 | Display the list of currently remembered directories. Directories | |
76 | find their way onto the list with the `pushd' command; you can get | |
77 | back up through the list with the `popd' command. | |
78 | ||
79 | The -l flag specifies that `dirs' should not print shorthand versions | |
80 | of directories which are relative to your home directory. This means | |
81 | that `~/bin' might be displayed as `/homes/bfox/bin'. The -v flag | |
82 | causes `dirs' to print the directory stack with one entry per line, | |
83 | prepending the directory name with its position in the stack. The -p | |
84 | flag does the same thing, but the stack position is not prepended. | |
85 | The -c flag clears the directory stack by deleting all of the elements. | |
86 | ||
87 | +N displays the Nth entry counting from the left of the list shown by | |
88 | dirs when invoked without options, starting with zero. | |
89 | ||
90 | -N displays the Nth entry counting from the right of the list shown by | |
91 | dirs when invoked without options, starting with zero. | |
92 | $END | |
93 | ||
94 | #include <config.h> | |
95 | ||
96 | #if defined (PUSHD_AND_POPD) | |
97 | #include <stdio.h> | |
cce855bc JA |
98 | #ifndef _MINIX |
99 | # include <sys/param.h> | |
100 | #endif | |
ccc6cda3 JA |
101 | |
102 | #if defined (HAVE_UNISTD_H) | |
cce855bc JA |
103 | # ifdef _MINIX |
104 | # include <sys/types.h> | |
105 | # endif | |
ccc6cda3 JA |
106 | # include <unistd.h> |
107 | #endif | |
108 | ||
109 | #include "../bashansi.h" | |
110 | ||
111 | #include <errno.h> | |
112 | ||
113 | #include <tilde/tilde.h> | |
114 | ||
115 | #include "../shell.h" | |
bb70624e | 116 | #include "maxpath.h" |
ccc6cda3 JA |
117 | #include "common.h" |
118 | #include "builtext.h" | |
119 | ||
b72432fd JA |
120 | #ifdef LOADABLE_BUILTIN |
121 | # include "builtins.h" | |
122 | #endif | |
123 | ||
ccc6cda3 JA |
124 | #if !defined (errno) |
125 | extern int errno; | |
126 | #endif /* !errno */ | |
127 | ||
128 | static char *m_badarg = "%s: bad argument"; | |
129 | ||
130 | /* The list of remembered directories. */ | |
131 | static char **pushd_directory_list = (char **)NULL; | |
132 | ||
133 | /* Number of existing slots in this list. */ | |
134 | static int directory_list_size; | |
135 | ||
136 | /* Offset to the end of the list. */ | |
137 | static int directory_list_offset; | |
138 | ||
139 | static void pushd_error (); | |
140 | static void clear_directory_stack (); | |
141 | static int cd_to_string (); | |
142 | static int change_to_temp (); | |
143 | static int get_dirstack_index (); | |
144 | static void add_dirstack_element (); | |
145 | ||
146 | #define NOCD 0x01 | |
147 | #define ROTATE 0x02 | |
148 | #define LONGFORM 0x04 | |
149 | #define CLEARSTAK 0x08 | |
150 | ||
151 | int | |
152 | pushd_builtin (list) | |
153 | WORD_LIST *list; | |
154 | { | |
155 | char *temp, *current_directory, *top; | |
156 | int j, flags; | |
157 | long num; | |
158 | char direction; | |
159 | ||
160 | /* If there is no argument list then switch current and | |
161 | top of list. */ | |
162 | if (list == 0) | |
163 | { | |
164 | if (directory_list_offset == 0) | |
165 | { | |
166 | builtin_error ("no other directory"); | |
167 | return (EXECUTION_FAILURE); | |
168 | } | |
169 | ||
170 | current_directory = get_working_directory ("pushd"); | |
171 | if (current_directory == 0) | |
172 | return (EXECUTION_FAILURE); | |
173 | ||
174 | j = directory_list_offset - 1; | |
175 | temp = pushd_directory_list[j]; | |
176 | pushd_directory_list[j] = current_directory; | |
177 | j = change_to_temp (temp); | |
178 | free (temp); | |
179 | return j; | |
180 | } | |
181 | ||
182 | for (flags = 0; list; list = list->next) | |
183 | { | |
184 | if (ISOPTION (list->word->word, 'n')) | |
185 | { | |
186 | flags |= NOCD; | |
187 | } | |
188 | else if (ISOPTION (list->word->word, '-')) | |
28ef6c31 JA |
189 | { |
190 | list = list->next; | |
191 | break; | |
192 | } | |
ccc6cda3 JA |
193 | else if (list->word->word[0] == '-' && list->word->word[1] == '\0') |
194 | /* Let `pushd -' work like it used to. */ | |
195 | break; | |
196 | else if (((direction = list->word->word[0]) == '+') || direction == '-') | |
197 | { | |
198 | if (legal_number (list->word->word + 1, &num) == 0) | |
199 | { | |
200 | builtin_error (m_badarg, list->word->word); | |
201 | builtin_usage (); | |
202 | return (EXECUTION_FAILURE); | |
203 | } | |
204 | ||
205 | if (direction == '-') | |
206 | num = directory_list_offset - num; | |
207 | ||
208 | if (num > directory_list_offset || num < 0) | |
209 | { | |
210 | pushd_error (directory_list_offset, list->word->word); | |
211 | return (EXECUTION_FAILURE); | |
212 | } | |
213 | flags |= ROTATE; | |
214 | } | |
215 | else if (*list->word->word == '-') | |
216 | { | |
217 | bad_option (list->word->word); | |
218 | builtin_usage (); | |
219 | return (EXECUTION_FAILURE); | |
220 | } | |
221 | else | |
222 | break; | |
223 | } | |
224 | ||
225 | if (flags & ROTATE) | |
226 | { | |
227 | /* Rotate the stack num times. Remember, the current | |
228 | directory acts like it is part of the stack. */ | |
229 | temp = get_working_directory ("pushd"); | |
230 | ||
231 | if (num == 0) | |
232 | { | |
233 | j = ((flags & NOCD) == 0) ? change_to_temp (temp) : EXECUTION_SUCCESS; | |
234 | free (temp); | |
235 | return j; | |
236 | } | |
237 | ||
238 | do | |
239 | { | |
240 | top = pushd_directory_list[directory_list_offset - 1]; | |
241 | ||
242 | for (j = directory_list_offset - 2; j > -1; j--) | |
243 | pushd_directory_list[j + 1] = pushd_directory_list[j]; | |
244 | ||
245 | pushd_directory_list[j + 1] = temp; | |
246 | ||
247 | temp = top; | |
248 | num--; | |
249 | } | |
250 | while (num); | |
251 | ||
252 | j = ((flags & NOCD) == 0) ? change_to_temp (temp) : EXECUTION_SUCCESS; | |
253 | free (temp); | |
254 | return j; | |
255 | } | |
256 | ||
257 | if (list == 0) | |
258 | return (EXECUTION_SUCCESS); | |
259 | ||
260 | /* Change to the directory in list->word->word. Save the current | |
261 | directory on the top of the stack. */ | |
262 | current_directory = get_working_directory ("pushd"); | |
263 | if (current_directory == 0) | |
264 | return (EXECUTION_FAILURE); | |
265 | ||
266 | j = ((flags & NOCD) == 0) ? cd_builtin (list) : EXECUTION_SUCCESS; | |
267 | if (j == EXECUTION_SUCCESS) | |
268 | { | |
269 | add_dirstack_element ((flags & NOCD) ? savestring (list->word->word) : current_directory); | |
270 | dirs_builtin ((WORD_LIST *)NULL); | |
d166f048 JA |
271 | if (flags & NOCD) |
272 | free (current_directory); | |
ccc6cda3 JA |
273 | return (EXECUTION_SUCCESS); |
274 | } | |
275 | else | |
276 | { | |
277 | free (current_directory); | |
278 | return (EXECUTION_FAILURE); | |
279 | } | |
280 | } | |
281 | ||
282 | /* Pop the directory stack, and then change to the new top of the stack. | |
283 | If LIST is non-null it should consist of a word +N or -N, which says | |
284 | what element to delete from the stack. The default is the top one. */ | |
285 | int | |
286 | popd_builtin (list) | |
287 | WORD_LIST *list; | |
288 | { | |
289 | register int i; | |
290 | long which; | |
291 | int flags; | |
292 | char direction; | |
d166f048 | 293 | char *which_word; |
ccc6cda3 | 294 | |
d166f048 | 295 | which_word = (char *)NULL; |
ccc6cda3 JA |
296 | for (flags = 0, which = 0L, direction = '+'; list; list = list->next) |
297 | { | |
298 | if (ISOPTION (list->word->word, 'n')) | |
28ef6c31 JA |
299 | { |
300 | flags |= NOCD; | |
301 | } | |
ccc6cda3 | 302 | else if (ISOPTION (list->word->word, '-')) |
28ef6c31 JA |
303 | { |
304 | list = list->next; | |
305 | break; | |
306 | } | |
ccc6cda3 JA |
307 | else if (((direction = list->word->word[0]) == '+') || direction == '-') |
308 | { | |
309 | if (legal_number (list->word->word + 1, &which) == 0) | |
310 | { | |
311 | builtin_error (m_badarg, list->word->word); | |
312 | builtin_usage (); | |
313 | return (EXECUTION_FAILURE); | |
314 | } | |
d166f048 | 315 | which_word = list->word->word; |
ccc6cda3 JA |
316 | } |
317 | else if (*list->word->word == '-') | |
318 | { | |
319 | bad_option (list->word->word); | |
320 | builtin_usage (); | |
321 | return (EXECUTION_FAILURE); | |
322 | } | |
323 | else | |
324 | break; | |
325 | } | |
326 | ||
327 | if (which > directory_list_offset || (directory_list_offset == 0 && which == 0)) | |
328 | { | |
d166f048 | 329 | pushd_error (directory_list_offset, which_word ? which_word : ""); |
ccc6cda3 JA |
330 | return (EXECUTION_FAILURE); |
331 | } | |
332 | ||
333 | /* Handle case of no specification, or top of stack specification. */ | |
334 | if ((direction == '+' && which == 0) || | |
335 | (direction == '-' && which == directory_list_offset)) | |
336 | { | |
337 | i = ((flags & NOCD) == 0) ? cd_to_string (pushd_directory_list[directory_list_offset - 1]) | |
28ef6c31 | 338 | : EXECUTION_SUCCESS; |
ccc6cda3 JA |
339 | if (i != EXECUTION_SUCCESS) |
340 | return (i); | |
341 | free (pushd_directory_list[--directory_list_offset]); | |
342 | } | |
343 | else | |
344 | { | |
345 | /* Since an offset other than the top directory was specified, | |
346 | remove that directory from the list and shift the remainder | |
347 | of the list into place. */ | |
348 | i = (direction == '+') ? directory_list_offset - which : which; | |
349 | free (pushd_directory_list[i]); | |
350 | directory_list_offset--; | |
351 | ||
352 | /* Shift the remainder of the list into place. */ | |
353 | for (; i < directory_list_offset; i++) | |
354 | pushd_directory_list[i] = pushd_directory_list[i + 1]; | |
355 | } | |
356 | ||
357 | dirs_builtin ((WORD_LIST *)NULL); | |
358 | return (EXECUTION_SUCCESS); | |
359 | } | |
360 | ||
361 | /* Print the current list of directories on the directory stack. */ | |
362 | int | |
363 | dirs_builtin (list) | |
364 | WORD_LIST *list; | |
365 | { | |
366 | int flags, desired_index, index_flag, vflag; | |
367 | long i; | |
368 | char *temp, *w; | |
369 | ||
370 | for (flags = vflag = index_flag = 0, desired_index = -1, w = ""; list; list = list->next) | |
371 | { | |
372 | if (ISOPTION (list->word->word, 'l')) | |
373 | { | |
374 | flags |= LONGFORM; | |
375 | } | |
376 | else if (ISOPTION (list->word->word, 'c')) | |
377 | { | |
378 | flags |= CLEARSTAK; | |
379 | } | |
380 | else if (ISOPTION (list->word->word, 'v')) | |
381 | { | |
382 | vflag |= 2; | |
383 | } | |
384 | else if (ISOPTION (list->word->word, 'p')) | |
385 | { | |
386 | vflag |= 1; | |
387 | } | |
388 | else if (ISOPTION (list->word->word, '-')) | |
28ef6c31 JA |
389 | { |
390 | list = list->next; | |
391 | break; | |
392 | } | |
ccc6cda3 | 393 | else if (*list->word->word == '+' || *list->word->word == '-') |
28ef6c31 JA |
394 | { |
395 | int sign; | |
396 | if (legal_number (w = list->word->word + 1, &i) == 0) | |
ccc6cda3 JA |
397 | { |
398 | builtin_error (m_badarg, list->word->word); | |
399 | builtin_usage (); | |
400 | return (EXECUTION_FAILURE); | |
401 | } | |
402 | sign = (*list->word->word == '+') ? 1 : -1; | |
403 | desired_index = get_dirstack_index (i, sign, &index_flag); | |
404 | } | |
405 | else | |
406 | { | |
407 | bad_option (list->word->word); | |
408 | builtin_usage (); | |
409 | return (EXECUTION_FAILURE); | |
410 | } | |
411 | } | |
412 | ||
413 | if (flags & CLEARSTAK) | |
414 | { | |
415 | clear_directory_stack (); | |
416 | return (EXECUTION_SUCCESS); | |
417 | } | |
418 | ||
419 | if (index_flag && (desired_index < 0 || desired_index > directory_list_offset)) | |
420 | { | |
421 | pushd_error (directory_list_offset, w); | |
422 | return (EXECUTION_FAILURE); | |
423 | } | |
424 | ||
425 | #define DIRSTACK_FORMAT(temp) \ | |
426 | (flags & LONGFORM) ? temp : polite_directory_format (temp) | |
427 | ||
428 | /* The first directory printed is always the current working directory. */ | |
429 | if (index_flag == 0 || (index_flag == 1 && desired_index == 0)) | |
430 | { | |
431 | temp = get_working_directory ("dirs"); | |
432 | if (temp == 0) | |
433 | temp = savestring ("<no current directory>"); | |
434 | if (vflag & 2) | |
435 | printf ("%2d %s", 0, DIRSTACK_FORMAT (temp)); | |
436 | else | |
437 | printf ("%s", DIRSTACK_FORMAT (temp)); | |
438 | free (temp); | |
439 | if (index_flag) | |
440 | { | |
441 | putchar ('\n'); | |
442 | return EXECUTION_SUCCESS; | |
443 | } | |
444 | } | |
445 | ||
446 | #define DIRSTACK_ENTRY(i) \ | |
447 | (flags & LONGFORM) ? pushd_directory_list[i] \ | |
448 | : polite_directory_format (pushd_directory_list[i]) | |
449 | ||
450 | /* Now print the requested directory stack entries. */ | |
451 | if (index_flag) | |
452 | { | |
453 | if (vflag & 2) | |
454 | printf ("%2d %s", directory_list_offset - desired_index, | |
455 | DIRSTACK_ENTRY (desired_index)); | |
456 | else | |
457 | printf ("%s", DIRSTACK_ENTRY (desired_index)); | |
458 | } | |
459 | else | |
460 | for (i = directory_list_offset - 1; i >= 0; i--) | |
461 | if (vflag >= 2) | |
462 | printf ("\n%2d %s", directory_list_offset - (int)i, DIRSTACK_ENTRY (i)); | |
463 | else | |
464 | printf ("%s%s", (vflag & 1) ? "\n" : " ", DIRSTACK_ENTRY (i)); | |
465 | ||
466 | putchar ('\n'); | |
467 | fflush (stdout); | |
468 | return (EXECUTION_SUCCESS); | |
469 | } | |
470 | ||
471 | static void | |
472 | pushd_error (offset, arg) | |
473 | int offset; | |
474 | char *arg; | |
475 | { | |
476 | if (offset == 0) | |
477 | builtin_error ("directory stack empty"); | |
478 | else if (arg) | |
479 | builtin_error ("%s: bad directory stack index", arg); | |
480 | else | |
481 | builtin_error ("bad directory stack index"); | |
482 | } | |
483 | ||
484 | static void | |
485 | clear_directory_stack () | |
486 | { | |
487 | register int i; | |
488 | ||
489 | for (i = 0; i < directory_list_offset; i++) | |
490 | free (pushd_directory_list[i]); | |
491 | directory_list_offset = 0; | |
492 | } | |
493 | ||
494 | /* Switch to the directory in NAME. This uses the cd_builtin to do the work, | |
495 | so if the result is EXECUTION_FAILURE then an error message has already | |
496 | been printed. */ | |
497 | static int | |
498 | cd_to_string (name) | |
499 | char *name; | |
500 | { | |
501 | WORD_LIST *tlist; | |
502 | int result; | |
503 | ||
504 | tlist = make_word_list (make_word (name), NULL); | |
505 | result = cd_builtin (tlist); | |
506 | dispose_words (tlist); | |
507 | return (result); | |
508 | } | |
509 | ||
510 | static int | |
511 | change_to_temp (temp) | |
512 | char *temp; | |
513 | { | |
514 | int tt; | |
515 | ||
516 | tt = temp ? cd_to_string (temp) : EXECUTION_FAILURE; | |
517 | ||
518 | if (tt == EXECUTION_SUCCESS) | |
519 | dirs_builtin ((WORD_LIST *)NULL); | |
520 | ||
521 | return (tt); | |
522 | } | |
523 | ||
524 | static void | |
525 | add_dirstack_element (dir) | |
526 | char *dir; | |
527 | { | |
528 | int j; | |
529 | ||
530 | if (directory_list_offset == directory_list_size) | |
531 | { | |
532 | j = (directory_list_size += 10) * sizeof (char *); | |
533 | pushd_directory_list = (char **)xrealloc (pushd_directory_list, j); | |
534 | } | |
535 | pushd_directory_list[directory_list_offset++] = dir; | |
536 | } | |
537 | ||
538 | static int | |
539 | get_dirstack_index (ind, sign, indexp) | |
540 | int ind, sign, *indexp; | |
541 | { | |
542 | if (indexp) | |
543 | *indexp = sign > 0 ? 1 : 2; | |
544 | ||
545 | /* dirs +0 prints the current working directory. */ | |
546 | /* dirs -0 prints last element in directory stack */ | |
547 | if (ind == 0 && sign > 0) | |
548 | return 0; | |
549 | else if (ind == directory_list_offset) | |
550 | { | |
551 | if (indexp) | |
552 | *indexp = sign > 0 ? 2 : 1; | |
553 | return 0; | |
554 | } | |
555 | else | |
556 | return (sign > 0 ? directory_list_offset - ind : ind); | |
557 | } | |
558 | ||
cce855bc JA |
559 | /* Used by the tilde expansion code. */ |
560 | char * | |
561 | get_dirstack_from_string (string) | |
562 | char *string; | |
563 | { | |
564 | int ind, sign, index_flag; | |
565 | long i; | |
566 | ||
567 | sign = 1; | |
568 | if (*string == '-' || *string == '+') | |
569 | { | |
570 | sign = (*string == '-') ? -1 : 1; | |
571 | string++; | |
572 | } | |
573 | if (legal_number (string, &i) == 0) | |
574 | return ((char *)NULL); | |
575 | ||
576 | index_flag = 0; | |
577 | ind = get_dirstack_index (i, sign, &index_flag); | |
578 | if (index_flag && (ind < 0 || ind > directory_list_offset)) | |
579 | return ((char *)NULL); | |
580 | if (index_flag == 0 || (index_flag == 1 && ind == 0)) | |
581 | return (get_string_value ("PWD")); | |
582 | else | |
583 | return (pushd_directory_list[ind]); | |
584 | } | |
585 | ||
586 | #ifdef INCLUDE_UNUSED | |
ccc6cda3 JA |
587 | char * |
588 | get_dirstack_element (ind, sign) | |
589 | int ind, sign; | |
590 | { | |
591 | int i; | |
592 | ||
593 | i = get_dirstack_index (ind, sign, (int *)NULL); | |
594 | return (i < 0 || i > directory_list_offset) ? (char *)NULL | |
595 | : pushd_directory_list[i]; | |
596 | } | |
cce855bc | 597 | #endif |
ccc6cda3 JA |
598 | |
599 | void | |
600 | set_dirstack_element (ind, sign, value) | |
601 | int ind, sign; | |
602 | char *value; | |
603 | { | |
604 | int i; | |
605 | ||
606 | i = get_dirstack_index (ind, sign, (int *)NULL); | |
607 | if (ind == 0 || i < 0 || i > directory_list_offset) | |
608 | return; | |
609 | free (pushd_directory_list[i]); | |
610 | pushd_directory_list[i] = savestring (value); | |
611 | } | |
612 | ||
613 | WORD_LIST * | |
614 | get_directory_stack () | |
615 | { | |
616 | register int i; | |
617 | WORD_LIST *ret; | |
618 | char *d, *t; | |
619 | ||
620 | for (ret = (WORD_LIST *)NULL, i = 0; i < directory_list_offset; i++) | |
621 | { | |
622 | d = polite_directory_format (pushd_directory_list[i]); | |
623 | ret = make_word_list (make_word (d), ret); | |
624 | } | |
625 | /* Now the current directory. */ | |
626 | d = get_working_directory ("dirstack"); | |
627 | i = 0; /* sentinel to decide whether or not to free d */ | |
628 | if (d == 0) | |
629 | d = "."; | |
630 | else | |
631 | { | |
632 | t = polite_directory_format (d); | |
633 | /* polite_directory_format sometimes returns its argument unchanged. | |
634 | If it does not, we can free d right away. If it does, we need to | |
635 | mark d to be deleted later. */ | |
636 | if (t != d) | |
637 | { | |
638 | free (d); | |
639 | d = t; | |
640 | } | |
641 | else /* t == d, so d is what we want */ | |
642 | i = 1; | |
643 | } | |
644 | ret = make_word_list (make_word (d), ret); | |
645 | if (i) | |
646 | free (d); | |
647 | return ret; /* was (REVERSE_LIST (ret, (WORD_LIST *)); */ | |
648 | } | |
b72432fd JA |
649 | |
650 | #ifdef LOADABLE_BUILTIN | |
651 | static char *dirs_doc[] = { | |
652 | "Display the list of currently remembered directories. Directories", | |
653 | "find their way onto the list with the `pushd' command; you can get", | |
654 | "back up through the list with the `popd' command.", | |
655 | "", | |
656 | "The -l flag specifies that `dirs' should not print shorthand versions", | |
657 | "of directories which are relative to your home directory. This means", | |
658 | "that `~/bin' might be displayed as `/homes/bfox/bin'. The -v flag", | |
659 | "causes `dirs' to print the directory stack with one entry per line,", | |
660 | "prepending the directory name with its position in the stack. The -p", | |
661 | "flag does the same thing, but the stack position is not prepended.", | |
662 | "The -c flag clears the directory stack by deleting all of the elements.", | |
663 | "", | |
664 | "+N displays the Nth entry counting from the left of the list shown by", | |
665 | " dirs when invoked without options, starting with zero.", | |
666 | "", | |
667 | "-N displays the Nth entry counting from the right of the list shown by", | |
668 | " dirs when invoked without options, starting with zero.", | |
669 | (char *)NULL | |
670 | }; | |
671 | ||
672 | static char *pushd_doc[] = { | |
673 | "Adds a directory to the top of the directory stack, or rotates", | |
674 | "the stack, making the new top of the stack the current working", | |
675 | "directory. With no arguments, exchanges the top two directories.", | |
676 | "", | |
677 | "+N Rotates the stack so that the Nth directory (counting", | |
678 | " from the left of the list shown by `dirs', starting with", | |
679 | " zero) is at the top.", | |
680 | "", | |
681 | "-N Rotates the stack so that the Nth directory (counting", | |
682 | " from the right of the list shown by `dirs', starting with", | |
683 | " zero) is at the top.", | |
684 | "", | |
685 | "-n suppress the normal change of directory when adding directories", | |
686 | " to the stack, so only the stack is manipulated.", | |
687 | "", | |
688 | "dir adds DIR to the directory stack at the top, making it the", | |
689 | " new current working directory.", | |
690 | "", | |
691 | "You can see the directory stack with the `dirs' command.", | |
692 | (char *)NULL | |
693 | }; | |
694 | ||
695 | static char *popd_doc[] = { | |
696 | "Removes entries from the directory stack. With no arguments,", | |
697 | "removes the top directory from the stack, and cd's to the new", | |
698 | "top directory.", | |
699 | "", | |
700 | "+N removes the Nth entry counting from the left of the list", | |
701 | " shown by `dirs', starting with zero. For example: `popd +0'", | |
702 | " removes the first directory, `popd +1' the second.", | |
703 | "", | |
704 | "-N removes the Nth entry counting from the right of the list", | |
705 | " shown by `dirs', starting with zero. For example: `popd -0'", | |
706 | " removes the last directory, `popd -1' the next to last.", | |
707 | "", | |
708 | "-n suppress the normal change of directory when removing directories", | |
709 | " from the stack, so only the stack is manipulated.", | |
710 | "", | |
711 | "You can see the directory stack with the `dirs' command.", | |
712 | (char *)NULL | |
713 | }; | |
714 | ||
715 | struct builtin pushd_struct = { | |
716 | "pushd", | |
717 | pushd_builtin, | |
718 | BUILTIN_ENABLED, | |
719 | pushd_doc, | |
720 | "pushd [+N | -N] [-n] [dir]", | |
721 | 0 | |
722 | }; | |
723 | ||
724 | struct builtin popd_struct = { | |
725 | "popd", | |
726 | popd_builtin, | |
727 | BUILTIN_ENABLED, | |
728 | popd_doc, | |
729 | "popd [+N | -N] [-n]", | |
730 | 0 | |
731 | }; | |
732 | ||
733 | struct builtin dirs_struct = { | |
734 | "dirs", | |
735 | dirs_builtin, | |
736 | BUILTIN_ENABLED, | |
737 | dirs_doc, | |
738 | "dirs [-clpv] [+N] [-N]", | |
739 | 0 | |
740 | }; | |
741 | #endif /* LOADABLE_BUILTIN */ | |
742 | ||
ccc6cda3 | 743 | #endif /* PUSHD_AND_POPD */ |