source: MondoRescue/branches/2.2.9/mindi-busybox/libbb/lineedit.c@ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 60.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Command line editing.
4 *
5 * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
6 * Written by: Vladimir Oleynik <dzo@simtreas.ru>
7 *
8 * Used ideas:
9 * Adam Rogoyski <rogoyski@cs.utexas.edu>
10 * Dave Cinege <dcinege@psychosis.com>
11 * Jakub Jelinek (c) 1995
12 * Erik Andersen <andersen@codepoet.org> (Majorly adjusted for busybox)
13 *
14 * This code is 'as is' with no warranty.
15 */
16
17/*
18 * Usage and known bugs:
19 * Terminal key codes are not extensive, more needs to be added.
20 * This version was created on Debian GNU/Linux 2.x.
21 * Delete, Backspace, Home, End, and the arrow keys were tested
22 * to work in an Xterm and console. Ctrl-A also works as Home.
23 * Ctrl-E also works as End.
24 *
25 * The following readline-like commands are not implemented:
26 * ESC-b -- Move back one word
27 * ESC-f -- Move forward one word
28 * ESC-d -- Delete forward one word
29 * CTL-t -- Transpose two characters
30 *
31 * lineedit does not know that the terminal escape sequences do not
32 * take up space on the screen. The redisplay code assumes, unless
33 * told otherwise, that each character in the prompt is a printable
34 * character that takes up one character position on the screen.
35 * You need to tell lineedit that some sequences of characters
36 * in the prompt take up no screen space. Compatibly with readline,
37 * use the \[ escape to begin a sequence of non-printing characters,
38 * and the \] escape to signal the end of such a sequence. Example:
39 *
40 * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
41 */
42#include "libbb.h"
43#include "unicode.h"
44
45#ifdef TEST
46# define ENABLE_FEATURE_EDITING 0
47# define ENABLE_FEATURE_TAB_COMPLETION 0
48# define ENABLE_FEATURE_USERNAME_COMPLETION 0
49#endif
50
51
52/* Entire file (except TESTing part) sits inside this #if */
53#if ENABLE_FEATURE_EDITING
54
55
56#define ENABLE_USERNAME_OR_HOMEDIR \
57 (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
58#define IF_USERNAME_OR_HOMEDIR(...)
59#if ENABLE_USERNAME_OR_HOMEDIR
60# undef IF_USERNAME_OR_HOMEDIR
61# define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
62#endif
63
64
65#undef CHAR_T
66#if ENABLE_UNICODE_SUPPORT
67# define BB_NUL ((wchar_t)0)
68# define CHAR_T wchar_t
69static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
70# if ENABLE_FEATURE_EDITING_VI
71static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
72# endif
73static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
74# undef isspace
75# undef isalnum
76# undef ispunct
77# undef isprint
78# define isspace isspace_must_not_be_used
79# define isalnum isalnum_must_not_be_used
80# define ispunct ispunct_must_not_be_used
81# define isprint isprint_must_not_be_used
82#else
83# define BB_NUL '\0'
84# define CHAR_T char
85# define BB_isspace(c) isspace(c)
86# define BB_isalnum(c) isalnum(c)
87# define BB_ispunct(c) ispunct(c)
88#endif
89#if ENABLE_UNICODE_PRESERVE_BROKEN
90# define unicode_mark_raw_byte(wc) ((wc) | 0x20000000)
91# define unicode_is_raw_byte(wc) ((wc) & 0x20000000)
92#else
93# define unicode_is_raw_byte(wc) 0
94#endif
95
96
97#define ESC "\033"
98
99#define SEQ_CLEAR_TILL_END_OF_SCREEN ESC"[J"
100//#define SEQ_CLEAR_TILL_END_OF_LINE ESC"[K"
101
102
103enum {
104 MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
105 ? CONFIG_FEATURE_EDITING_MAX_LEN
106 : 0x7ff0
107};
108
109#if ENABLE_USERNAME_OR_HOMEDIR
110static const char null_str[] ALIGN1 = "";
111#endif
112
113/* We try to minimize both static and stack usage. */
114struct lineedit_statics {
115 line_input_t *state;
116
117 volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
118 sighandler_t previous_SIGWINCH_handler;
119
120 unsigned cmdedit_x; /* real x (col) terminal position */
121 unsigned cmdedit_y; /* pseudoreal y (row) terminal position */
122 unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
123
124 unsigned cursor;
125 int command_len; /* must be signed */
126 /* signed maxsize: we want x in "if (x > S.maxsize)"
127 * to _not_ be promoted to unsigned */
128 int maxsize;
129 CHAR_T *command_ps;
130
131 const char *cmdedit_prompt;
132#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
133 int num_ok_lines; /* = 1; */
134#endif
135
136#if ENABLE_USERNAME_OR_HOMEDIR
137 char *user_buf;
138 char *home_pwd_buf; /* = (char*)null_str; */
139#endif
140
141#if ENABLE_FEATURE_TAB_COMPLETION
142 char **matches;
143 unsigned num_matches;
144#endif
145
146#if ENABLE_FEATURE_EDITING_VI
147# define DELBUFSIZ 128
148 CHAR_T *delptr;
149 smallint newdelflag; /* whether delbuf should be reused yet */
150 CHAR_T delbuf[DELBUFSIZ]; /* a place to store deleted characters */
151#endif
152#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
153 smallint sent_ESC_br6n;
154#endif
155};
156
157/* See lineedit_ptr_hack.c */
158extern struct lineedit_statics *const lineedit_ptr_to_statics;
159
160#define S (*lineedit_ptr_to_statics)
161#define state (S.state )
162#define cmdedit_termw (S.cmdedit_termw )
163#define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
164#define cmdedit_x (S.cmdedit_x )
165#define cmdedit_y (S.cmdedit_y )
166#define cmdedit_prmt_len (S.cmdedit_prmt_len)
167#define cursor (S.cursor )
168#define command_len (S.command_len )
169#define command_ps (S.command_ps )
170#define cmdedit_prompt (S.cmdedit_prompt )
171#define num_ok_lines (S.num_ok_lines )
172#define user_buf (S.user_buf )
173#define home_pwd_buf (S.home_pwd_buf )
174#define matches (S.matches )
175#define num_matches (S.num_matches )
176#define delptr (S.delptr )
177#define newdelflag (S.newdelflag )
178#define delbuf (S.delbuf )
179
180#define INIT_S() do { \
181 (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
182 barrier(); \
183 cmdedit_termw = 80; \
184 IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
185 IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
186} while (0)
187static void deinit_S(void)
188{
189#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
190 /* This one is allocated only if FANCY_PROMPT is on
191 * (otherwise it points to verbatim prompt (NOT malloced)) */
192 free((char*)cmdedit_prompt);
193#endif
194#if ENABLE_USERNAME_OR_HOMEDIR
195 free(user_buf);
196 if (home_pwd_buf != null_str)
197 free(home_pwd_buf);
198#endif
199 free(lineedit_ptr_to_statics);
200}
201#define DEINIT_S() deinit_S()
202
203
204#if ENABLE_UNICODE_SUPPORT
205static size_t load_string(const char *src, int maxsize)
206{
207 ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
208 if (len < 0)
209 len = 0;
210 command_ps[len] = BB_NUL;
211 return len;
212}
213static unsigned save_string(char *dst, unsigned maxsize)
214{
215# if !ENABLE_UNICODE_PRESERVE_BROKEN
216 ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
217 if (len < 0)
218 len = 0;
219 dst[len] = '\0';
220 return len;
221# else
222 unsigned dstpos = 0;
223 unsigned srcpos = 0;
224
225 maxsize--;
226 while (dstpos < maxsize) {
227 wchar_t wc;
228 int n = srcpos;
229
230 /* Convert up to 1st invalid byte (or up to end) */
231 while ((wc = command_ps[srcpos]) != BB_NUL
232 && !unicode_is_raw_byte(wc)
233 ) {
234 srcpos++;
235 }
236 command_ps[srcpos] = BB_NUL;
237 n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
238 if (n < 0) /* should not happen */
239 break;
240 dstpos += n;
241 if (wc == BB_NUL) /* usually is */
242 break;
243
244 /* We do have invalid byte here! */
245 command_ps[srcpos] = wc; /* restore it */
246 srcpos++;
247 if (dstpos == maxsize)
248 break;
249 dst[dstpos++] = (char) wc;
250 }
251 dst[dstpos] = '\0';
252 return dstpos;
253# endif
254}
255/* I thought just fputwc(c, stdout) would work. But no... */
256static void BB_PUTCHAR(wchar_t c)
257{
258 char buf[MB_CUR_MAX + 1];
259 mbstate_t mbst = { 0 };
260 ssize_t len;
261
262 len = wcrtomb(buf, c, &mbst);
263 if (len > 0) {
264 buf[len] = '\0';
265 fputs(buf, stdout);
266 }
267}
268# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
269static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
270# else
271static wchar_t adjust_width_and_validate_wc(wchar_t wc)
272# define adjust_width_and_validate_wc(width_adj, wc) \
273 ((*(width_adj))++, adjust_width_and_validate_wc(wc))
274# endif
275{
276 int w = 1;
277
278 if (unicode_status == UNICODE_ON) {
279 if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
280 /* note: also true for unicode_is_raw_byte(wc) */
281 goto subst;
282 }
283 w = wcwidth(wc);
284 if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
285 || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
286 || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
287 ) {
288 subst:
289 w = 1;
290 wc = CONFIG_SUBST_WCHAR;
291 }
292 }
293
294# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
295 *width_adj += w;
296#endif
297 return wc;
298}
299#else /* !UNICODE */
300static size_t load_string(const char *src, int maxsize)
301{
302 safe_strncpy(command_ps, src, maxsize);
303 return strlen(command_ps);
304}
305# if ENABLE_FEATURE_TAB_COMPLETION
306static void save_string(char *dst, unsigned maxsize)
307{
308 safe_strncpy(dst, command_ps, maxsize);
309}
310# endif
311# define BB_PUTCHAR(c) bb_putchar(c)
312/* Should never be called: */
313int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
314#endif
315
316
317/* Put 'command_ps[cursor]', cursor++.
318 * Advance cursor on screen. If we reached right margin, scroll text up
319 * and remove terminal margin effect by printing 'next_char' */
320#define HACK_FOR_WRONG_WIDTH 1
321static void put_cur_glyph_and_inc_cursor(void)
322{
323 CHAR_T c = command_ps[cursor];
324 unsigned width = 0;
325 int ofs_to_right;
326
327 if (c == BB_NUL) {
328 /* erase character after end of input string */
329 c = ' ';
330 } else {
331 /* advance cursor only if we aren't at the end yet */
332 cursor++;
333 if (unicode_status == UNICODE_ON) {
334 IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
335 c = adjust_width_and_validate_wc(&cmdedit_x, c);
336 IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
337 } else {
338 cmdedit_x++;
339 }
340 }
341
342 ofs_to_right = cmdedit_x - cmdedit_termw;
343 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
344 /* c fits on this line */
345 BB_PUTCHAR(c);
346 }
347
348 if (ofs_to_right >= 0) {
349 /* we go to the next line */
350#if HACK_FOR_WRONG_WIDTH
351 /* This works better if our idea of term width is wrong
352 * and it is actually wider (often happens on serial lines).
353 * Printing CR,LF *forces* cursor to next line.
354 * OTOH if terminal width is correct AND terminal does NOT
355 * have automargin (IOW: it is moving cursor to next line
356 * by itself (which is wrong for VT-10x terminals)),
357 * this will break things: there will be one extra empty line */
358 puts("\r"); /* + implicit '\n' */
359#else
360 /* VT-10x terminals don't wrap cursor to next line when last char
361 * on the line is printed - cursor stays "over" this char.
362 * Need to print _next_ char too (first one to appear on next line)
363 * to make cursor move down to next line.
364 */
365 /* Works ok only if cmdedit_termw is correct. */
366 c = command_ps[cursor];
367 if (c == BB_NUL)
368 c = ' ';
369 BB_PUTCHAR(c);
370 bb_putchar('\b');
371#endif
372 cmdedit_y++;
373 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
374 width = 0;
375 } else { /* ofs_to_right > 0 */
376 /* wide char c didn't fit on prev line */
377 BB_PUTCHAR(c);
378 }
379 cmdedit_x = width;
380 }
381}
382
383/* Move to end of line (by printing all chars till the end) */
384static void put_till_end_and_adv_cursor(void)
385{
386 while (cursor < command_len)
387 put_cur_glyph_and_inc_cursor();
388}
389
390/* Go to the next line */
391static void goto_new_line(void)
392{
393 put_till_end_and_adv_cursor();
394 if (cmdedit_x != 0)
395 bb_putchar('\n');
396}
397
398static void beep(void)
399{
400 bb_putchar('\007');
401}
402
403static void put_prompt(void)
404{
405 unsigned w;
406
407 fputs(cmdedit_prompt, stdout);
408 fflush_all();
409 cursor = 0;
410 w = cmdedit_termw; /* read volatile var once */
411 cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
412 cmdedit_x = cmdedit_prmt_len % w;
413}
414
415/* Move back one character */
416/* (optimized for slow terminals) */
417static void input_backward(unsigned num)
418{
419 if (num > cursor)
420 num = cursor;
421 if (num == 0)
422 return;
423 cursor -= num;
424
425 if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
426 && unicode_status == UNICODE_ON
427 ) {
428 /* correct NUM to be equal to _screen_ width */
429 int n = num;
430 num = 0;
431 while (--n >= 0)
432 adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
433 if (num == 0)
434 return;
435 }
436
437 if (cmdedit_x >= num) {
438 cmdedit_x -= num;
439 if (num <= 4) {
440 /* This is longer by 5 bytes on x86.
441 * Also gets miscompiled for ARM users
442 * (busybox.net/bugs/view.php?id=2274).
443 * printf(("\b\b\b\b" + 4) - num);
444 * return;
445 */
446 do {
447 bb_putchar('\b');
448 } while (--num);
449 return;
450 }
451 printf(ESC"[%uD", num);
452 return;
453 }
454
455 /* Need to go one or more lines up */
456 if (ENABLE_UNICODE_WIDE_WCHARS) {
457 /* With wide chars, it is hard to "backtrack"
458 * and reliably figure out where to put cursor.
459 * Example (<> is a wide char; # is an ordinary char, _ cursor):
460 * |prompt: <><> |
461 * |<><><><><><> |
462 * |_ |
463 * and user presses left arrow. num = 1, cmdedit_x = 0,
464 * We need to go up one line, and then - how do we know that
465 * we need to go *10* positions to the right? Because
466 * |prompt: <>#<>|
467 * |<><><>#<><><>|
468 * |_ |
469 * in this situation we need to go *11* positions to the right.
470 *
471 * A simpler thing to do is to redraw everything from the start
472 * up to new cursor position (which is already known):
473 */
474 unsigned sv_cursor;
475 /* go to 1st column; go up to first line */
476 printf("\r" ESC"[%uA", cmdedit_y);
477 cmdedit_y = 0;
478 sv_cursor = cursor;
479 put_prompt(); /* sets cursor to 0 */
480 while (cursor < sv_cursor)
481 put_cur_glyph_and_inc_cursor();
482 } else {
483 int lines_up;
484 unsigned width;
485 /* num = chars to go back from the beginning of current line: */
486 num -= cmdedit_x;
487 width = cmdedit_termw; /* read volatile var once */
488 /* num=1...w: one line up, w+1...2w: two, etc: */
489 lines_up = 1 + (num - 1) / width;
490 cmdedit_x = (width * cmdedit_y - num) % width;
491 cmdedit_y -= lines_up;
492 /* go to 1st column; go up */
493 printf("\r" ESC"[%uA", lines_up);
494 /* go to correct column.
495 * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
496 * need to *make sure* we skip it if cmdedit_x == 0 */
497 if (cmdedit_x)
498 printf(ESC"[%uC", cmdedit_x);
499 }
500}
501
502/* draw prompt, editor line, and clear tail */
503static void redraw(int y, int back_cursor)
504{
505 if (y > 0) /* up y lines */
506 printf(ESC"[%uA", y);
507 bb_putchar('\r');
508 put_prompt();
509 put_till_end_and_adv_cursor();
510 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
511 input_backward(back_cursor);
512}
513
514/* Delete the char in front of the cursor, optionally saving it
515 * for later putback */
516#if !ENABLE_FEATURE_EDITING_VI
517static void input_delete(void)
518#define input_delete(save) input_delete()
519#else
520static void input_delete(int save)
521#endif
522{
523 int j = cursor;
524
525 if (j == (int)command_len)
526 return;
527
528#if ENABLE_FEATURE_EDITING_VI
529 if (save) {
530 if (newdelflag) {
531 delptr = delbuf;
532 newdelflag = 0;
533 }
534 if ((delptr - delbuf) < DELBUFSIZ)
535 *delptr++ = command_ps[j];
536 }
537#endif
538
539 memmove(command_ps + j, command_ps + j + 1,
540 /* (command_len + 1 [because of NUL]) - (j + 1)
541 * simplified into (command_len - j) */
542 (command_len - j) * sizeof(command_ps[0]));
543 command_len--;
544 put_till_end_and_adv_cursor();
545 /* Last char is still visible, erase it (and more) */
546 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
547 input_backward(cursor - j); /* back to old pos cursor */
548}
549
550#if ENABLE_FEATURE_EDITING_VI
551static void put(void)
552{
553 int ocursor;
554 int j = delptr - delbuf;
555
556 if (j == 0)
557 return;
558 ocursor = cursor;
559 /* open hole and then fill it */
560 memmove(command_ps + cursor + j, command_ps + cursor,
561 (command_len - cursor + 1) * sizeof(command_ps[0]));
562 memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
563 command_len += j;
564 put_till_end_and_adv_cursor();
565 input_backward(cursor - ocursor - j + 1); /* at end of new text */
566}
567#endif
568
569/* Delete the char in back of the cursor */
570static void input_backspace(void)
571{
572 if (cursor > 0) {
573 input_backward(1);
574 input_delete(0);
575 }
576}
577
578/* Move forward one character */
579static void input_forward(void)
580{
581 if (cursor < command_len)
582 put_cur_glyph_and_inc_cursor();
583}
584
585#if ENABLE_FEATURE_TAB_COMPLETION
586
587//FIXME:
588//needs to be more clever: currently it thinks that "foo\ b<TAB>
589//matches the file named "foo bar", which is untrue.
590//Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
591//not "foo bar <cursor>...
592
593static void free_tab_completion_data(void)
594{
595 if (matches) {
596 while (num_matches)
597 free(matches[--num_matches]);
598 free(matches);
599 matches = NULL;
600 }
601}
602
603static void add_match(char *matched)
604{
605 matches = xrealloc_vector(matches, 4, num_matches);
606 matches[num_matches] = matched;
607 num_matches++;
608}
609
610# if ENABLE_FEATURE_USERNAME_COMPLETION
611/* Replace "~user/..." with "/homedir/...".
612 * The parameter is malloced, free it or return it
613 * unchanged if no user is matched.
614 */
615static char *username_path_completion(char *ud)
616{
617 struct passwd *entry;
618 char *tilde_name = ud;
619 char *home = NULL;
620
621 ud++; /* skip ~ */
622 if (*ud == '/') { /* "~/..." */
623 home = home_pwd_buf;
624 } else {
625 /* "~user/..." */
626 ud = strchr(ud, '/');
627 *ud = '\0'; /* "~user" */
628 entry = getpwnam(tilde_name + 1);
629 *ud = '/'; /* restore "~user/..." */
630 if (entry)
631 home = entry->pw_dir;
632 }
633 if (home) {
634 ud = concat_path_file(home, ud);
635 free(tilde_name);
636 tilde_name = ud;
637 }
638 return tilde_name;
639}
640
641/* ~use<tab> - find all users with this prefix.
642 * Return the length of the prefix used for matching.
643 */
644static NOINLINE unsigned complete_username(const char *ud)
645{
646 /* Using _r function to avoid pulling in static buffers */
647 char line_buff[256];
648 struct passwd pwd;
649 struct passwd *result;
650 unsigned userlen;
651
652 ud++; /* skip ~ */
653 userlen = strlen(ud);
654
655 setpwent();
656 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
657 /* Null usernames should result in all users as possible completions. */
658 if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
659 add_match(xasprintf("~%s/", pwd.pw_name));
660 }
661 }
662 endpwent();
663
664 return 1 + userlen;
665}
666# endif /* FEATURE_USERNAME_COMPLETION */
667
668enum {
669 FIND_EXE_ONLY = 0,
670 FIND_DIR_ONLY = 1,
671 FIND_FILE_ONLY = 2,
672};
673
674static int path_parse(char ***p)
675{
676 int npth;
677 const char *pth;
678 char *tmp;
679 char **res;
680
681 if (state->flags & WITH_PATH_LOOKUP)
682 pth = state->path_lookup;
683 else
684 pth = getenv("PATH");
685
686 /* PATH="" or PATH=":"? */
687 if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
688 return 1;
689
690 tmp = (char*)pth;
691 npth = 1; /* path component count */
692 while (1) {
693 tmp = strchr(tmp, ':');
694 if (!tmp)
695 break;
696 tmp++;
697 if (*tmp == '\0')
698 break; /* :<empty> */
699 npth++;
700 }
701
702 *p = res = xmalloc(npth * sizeof(res[0]));
703 res[0] = tmp = xstrdup(pth);
704 npth = 1;
705 while (1) {
706 tmp = strchr(tmp, ':');
707 if (!tmp)
708 break;
709 *tmp++ = '\0'; /* ':' -> '\0' */
710 if (*tmp == '\0')
711 break; /* :<empty> */
712 res[npth++] = tmp;
713 }
714 return npth;
715}
716
717/* Complete command, directory or file name.
718 * Return the length of the prefix used for matching.
719 */
720static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
721{
722 char *path1[1];
723 char **paths = path1;
724 int npaths;
725 int i;
726 unsigned pf_len;
727 const char *pfind;
728 char *dirbuf = NULL;
729
730 npaths = 1;
731 path1[0] = (char*)".";
732
733 pfind = strrchr(command, '/');
734 if (!pfind) {
735 if (type == FIND_EXE_ONLY)
736 npaths = path_parse(&paths);
737 pfind = command;
738 } else {
739 /* point to 'l' in "..../last_component" */
740 pfind++;
741 /* dirbuf = ".../.../.../" */
742 dirbuf = xstrndup(command, pfind - command);
743# if ENABLE_FEATURE_USERNAME_COMPLETION
744 if (dirbuf[0] == '~') /* ~/... or ~user/... */
745 dirbuf = username_path_completion(dirbuf);
746# endif
747 path1[0] = dirbuf;
748 }
749 pf_len = strlen(pfind);
750
751 for (i = 0; i < npaths; i++) {
752 DIR *dir;
753 struct dirent *next;
754 struct stat st;
755 char *found;
756
757 dir = opendir(paths[i]);
758 if (!dir)
759 continue; /* don't print an error */
760
761 while ((next = readdir(dir)) != NULL) {
762 unsigned len;
763 const char *name_found = next->d_name;
764
765 /* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
766 if (!pfind[0] && DOT_OR_DOTDOT(name_found))
767 continue;
768 /* match? */
769 if (strncmp(name_found, pfind, pf_len) != 0)
770 continue; /* no */
771
772 found = concat_path_file(paths[i], name_found);
773 /* NB: stat() first so that we see is it a directory;
774 * but if that fails, use lstat() so that
775 * we still match dangling links */
776 if (stat(found, &st) && lstat(found, &st))
777 goto cont; /* hmm, remove in progress? */
778
779 /* Save only name */
780 len = strlen(name_found);
781 found = xrealloc(found, len + 2); /* +2: for slash and NUL */
782 strcpy(found, name_found);
783
784 if (S_ISDIR(st.st_mode)) {
785 /* name is a directory, add slash */
786 found[len] = '/';
787 found[len + 1] = '\0';
788 } else {
789 /* skip files if looking for dirs only (example: cd) */
790 if (type == FIND_DIR_ONLY)
791 goto cont;
792 }
793 /* add it to the list */
794 add_match(found);
795 continue;
796 cont:
797 free(found);
798 }
799 closedir(dir);
800 } /* for every path */
801
802 if (paths != path1) {
803 free(paths[0]); /* allocated memory is only in first member */
804 free(paths);
805 }
806 free(dirbuf);
807
808 return pf_len;
809}
810
811/* build_match_prefix:
812 * On entry, match_buf contains everything up to cursor at the moment <tab>
813 * was pressed. This function looks at it, figures out what part of it
814 * constitutes the command/file/directory prefix to use for completion,
815 * and rewrites match_buf to contain only that part.
816 */
817#define dbg_bmp 0
818/* Helpers: */
819/* QUOT is used on elements of int_buf[], which are bytes,
820 * not Unicode chars. Therefore it works correctly even in Unicode mode.
821 */
822#define QUOT (UCHAR_MAX+1)
823static void remove_chunk(int16_t *int_buf, int beg, int end)
824{
825 /* beg must be <= end */
826 if (beg == end)
827 return;
828
829 while ((int_buf[beg] = int_buf[end]) != 0)
830 beg++, end++;
831
832 if (dbg_bmp) {
833 int i;
834 for (i = 0; int_buf[i]; i++)
835 bb_putchar((unsigned char)int_buf[i]);
836 bb_putchar('\n');
837 }
838}
839/* Caller ensures that match_buf points to a malloced buffer
840 * big enough to hold strlen(match_buf)*2 + 2
841 */
842static NOINLINE int build_match_prefix(char *match_buf)
843{
844 int i, j;
845 int command_mode;
846 int16_t *int_buf = (int16_t*)match_buf;
847
848 if (dbg_bmp) printf("\n%s\n", match_buf);
849
850 /* Copy in reverse order, since they overlap */
851 i = strlen(match_buf);
852 do {
853 int_buf[i] = (unsigned char)match_buf[i];
854 i--;
855 } while (i >= 0);
856
857 /* Mark every \c as "quoted c" */
858 for (i = 0; int_buf[i]; i++) {
859 if (int_buf[i] == '\\') {
860 remove_chunk(int_buf, i, i + 1);
861 int_buf[i] |= QUOT;
862 }
863 }
864 /* Quote-mark "chars" and 'chars', drop delimiters */
865 {
866 int in_quote = 0;
867 i = 0;
868 while (int_buf[i]) {
869 int cur = int_buf[i];
870 if (!cur)
871 break;
872 if (cur == '\'' || cur == '"') {
873 if (!in_quote || (cur == in_quote)) {
874 in_quote ^= cur;
875 remove_chunk(int_buf, i, i + 1);
876 continue;
877 }
878 }
879 if (in_quote)
880 int_buf[i] = cur | QUOT;
881 i++;
882 }
883 }
884
885 /* Remove everything up to command delimiters:
886 * ';' ';;' '&' '|' '&&' '||',
887 * but careful with '>&' '<&' '>|'
888 */
889 for (i = 0; int_buf[i]; i++) {
890 int cur = int_buf[i];
891 if (cur == ';' || cur == '&' || cur == '|') {
892 int prev = i ? int_buf[i - 1] : 0;
893 if (cur == '&' && (prev == '>' || prev == '<')) {
894 continue;
895 } else if (cur == '|' && prev == '>') {
896 continue;
897 }
898 remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
899 i = -1; /* back to square 1 */
900 }
901 }
902 /* Remove all `cmd` */
903 for (i = 0; int_buf[i]; i++) {
904 if (int_buf[i] == '`') {
905 for (j = i + 1; int_buf[j]; j++) {
906 if (int_buf[j] == '`') {
907 /* `cmd` should count as a word:
908 * `cmd` c<tab> should search for files c*,
909 * not commands c*. Therefore we don't drop
910 * `cmd` entirely, we replace it with single `.
911 */
912 remove_chunk(int_buf, i, j);
913 goto next;
914 }
915 }
916 /* No closing ` - command mode, remove all up to ` */
917 remove_chunk(int_buf, 0, i + 1);
918 break;
919 next: ;
920 }
921 }
922
923 /* Remove "cmd (" and "cmd {"
924 * Example: "if { c<tab>"
925 * In this example, c should be matched as command pfx.
926 */
927 for (i = 0; int_buf[i]; i++) {
928 if (int_buf[i] == '(' || int_buf[i] == '{') {
929 remove_chunk(int_buf, 0, i + 1);
930 i = -1; /* back to square 1 */
931 }
932 }
933
934 /* Remove leading unquoted spaces */
935 for (i = 0; int_buf[i]; i++)
936 if (int_buf[i] != ' ')
937 break;
938 remove_chunk(int_buf, 0, i);
939
940 /* Determine completion mode */
941 command_mode = FIND_EXE_ONLY;
942 for (i = 0; int_buf[i]; i++) {
943 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
944 if (int_buf[i] == ' '
945 && command_mode == FIND_EXE_ONLY
946 && (char)int_buf[0] == 'c'
947 && (char)int_buf[1] == 'd'
948 && i == 2 /* -> int_buf[2] == ' ' */
949 ) {
950 command_mode = FIND_DIR_ONLY;
951 } else {
952 command_mode = FIND_FILE_ONLY;
953 break;
954 }
955 }
956 }
957 if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);
958
959 /* Remove everything except last word */
960 for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
961 continue;
962 for (--i; i >= 0; i--) {
963 int cur = int_buf[i];
964 if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
965 remove_chunk(int_buf, 0, i + 1);
966 break;
967 }
968 }
969
970 /* Convert back to string of _chars_ */
971 i = 0;
972 while ((match_buf[i] = int_buf[i]) != '\0')
973 i++;
974
975 if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);
976
977 return command_mode;
978}
979
980/*
981 * Display by column (original idea from ls applet,
982 * very optimized by me [Vladimir] :)
983 */
984static void showfiles(void)
985{
986 int ncols, row;
987 int column_width = 0;
988 int nfiles = num_matches;
989 int nrows = nfiles;
990 int l;
991
992 /* find the longest file name - use that as the column width */
993 for (row = 0; row < nrows; row++) {
994 l = unicode_strwidth(matches[row]);
995 if (column_width < l)
996 column_width = l;
997 }
998 column_width += 2; /* min space for columns */
999 ncols = cmdedit_termw / column_width;
1000
1001 if (ncols > 1) {
1002 nrows /= ncols;
1003 if (nfiles % ncols)
1004 nrows++; /* round up fractionals */
1005 } else {
1006 ncols = 1;
1007 }
1008 for (row = 0; row < nrows; row++) {
1009 int n = row;
1010 int nc;
1011
1012 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
1013 printf("%s%-*s", matches[n],
1014 (int)(column_width - unicode_strwidth(matches[n])), ""
1015 );
1016 }
1017 if (ENABLE_UNICODE_SUPPORT)
1018 puts(printable_string(NULL, matches[n]));
1019 else
1020 puts(matches[n]);
1021 }
1022}
1023
1024static const char *is_special_char(char c)
1025{
1026 return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
1027}
1028
1029static char *quote_special_chars(char *found)
1030{
1031 int l = 0;
1032 char *s = xzalloc((strlen(found) + 1) * 2);
1033
1034 while (*found) {
1035 if (is_special_char(*found))
1036 s[l++] = '\\';
1037 s[l++] = *found++;
1038 }
1039 /* s[l] = '\0'; - already is */
1040 return s;
1041}
1042
1043/* Do TAB completion */
1044static NOINLINE void input_tab(smallint *lastWasTab)
1045{
1046 char *chosen_match;
1047 char *match_buf;
1048 size_t len_found;
1049 /* Length of string used for matching */
1050 unsigned match_pfx_len = match_pfx_len;
1051 int find_type;
1052# if ENABLE_UNICODE_SUPPORT
1053 /* cursor pos in command converted to multibyte form */
1054 int cursor_mb;
1055# endif
1056 if (!(state->flags & TAB_COMPLETION))
1057 return;
1058
1059 if (*lastWasTab) {
1060 /* The last char was a TAB too.
1061 * Print a list of all the available choices.
1062 */
1063 if (num_matches > 0) {
1064 /* cursor will be changed by goto_new_line() */
1065 int sav_cursor = cursor;
1066 goto_new_line();
1067 showfiles();
1068 redraw(0, command_len - sav_cursor);
1069 }
1070 return;
1071 }
1072
1073 *lastWasTab = 1;
1074 chosen_match = NULL;
1075
1076 /* Make a local copy of the string up to the position of the cursor.
1077 * build_match_prefix will expand it into int16_t's, need to allocate
1078 * twice as much as the string_len+1.
1079 * (we then also (ab)use this extra space later - see (**))
1080 */
1081 match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
1082# if !ENABLE_UNICODE_SUPPORT
1083 save_string(match_buf, cursor + 1); /* +1 for NUL */
1084# else
1085 {
1086 CHAR_T wc = command_ps[cursor];
1087 command_ps[cursor] = BB_NUL;
1088 save_string(match_buf, MAX_LINELEN);
1089 command_ps[cursor] = wc;
1090 cursor_mb = strlen(match_buf);
1091 }
1092# endif
1093 find_type = build_match_prefix(match_buf);
1094
1095 /* Free up any memory already allocated */
1096 free_tab_completion_data();
1097
1098# if ENABLE_FEATURE_USERNAME_COMPLETION
1099 /* If the word starts with ~ and there is no slash in the word,
1100 * then try completing this word as a username. */
1101 if (state->flags & USERNAME_COMPLETION)
1102 if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
1103 match_pfx_len = complete_username(match_buf);
1104# endif
1105 /* If complete_username() did not match,
1106 * try to match a command in $PATH, or a directory, or a file */
1107 if (!matches)
1108 match_pfx_len = complete_cmd_dir_file(match_buf, find_type);
1109
1110 /* Account for backslashes which will be inserted
1111 * by quote_special_chars() later */
1112 {
1113 const char *e = match_buf + strlen(match_buf);
1114 const char *s = e - match_pfx_len;
1115 while (s < e)
1116 if (is_special_char(*s++))
1117 match_pfx_len++;
1118 }
1119
1120 /* Remove duplicates */
1121 if (matches) {
1122 unsigned i, n = 0;
1123 qsort_string_vector(matches, num_matches);
1124 for (i = 0; i < num_matches - 1; ++i) {
1125 //if (matches[i] && matches[i+1]) { /* paranoia */
1126 if (strcmp(matches[i], matches[i+1]) == 0) {
1127 free(matches[i]);
1128 //matches[i] = NULL; /* paranoia */
1129 } else {
1130 matches[n++] = matches[i];
1131 }
1132 //}
1133 }
1134 matches[n++] = matches[i];
1135 num_matches = n;
1136 }
1137
1138 /* Did we find exactly one match? */
1139 if (num_matches != 1) { /* no */
1140 char *cp;
1141 beep();
1142 if (!matches)
1143 goto ret; /* no matches at all */
1144 /* Find common prefix */
1145 chosen_match = xstrdup(matches[0]);
1146 for (cp = chosen_match; *cp; cp++) {
1147 unsigned n;
1148 for (n = 1; n < num_matches; n++) {
1149 if (matches[n][cp - chosen_match] != *cp) {
1150 goto stop;
1151 }
1152 }
1153 }
1154 stop:
1155 if (cp == chosen_match) { /* have unique prefix? */
1156 goto ret; /* no */
1157 }
1158 *cp = '\0';
1159 cp = quote_special_chars(chosen_match);
1160 free(chosen_match);
1161 chosen_match = cp;
1162 len_found = strlen(chosen_match);
1163 } else { /* exactly one match */
1164 /* Next <tab> is not a double-tab */
1165 *lastWasTab = 0;
1166
1167 chosen_match = quote_special_chars(matches[0]);
1168 len_found = strlen(chosen_match);
1169 if (chosen_match[len_found-1] != '/') {
1170 chosen_match[len_found] = ' ';
1171 chosen_match[++len_found] = '\0';
1172 }
1173 }
1174
1175# if !ENABLE_UNICODE_SUPPORT
1176 /* Have space to place the match? */
1177 /* The result consists of three parts with these lengths: */
1178 /* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
1179 /* it simplifies into: */
1180 if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
1181 int pos;
1182 /* save tail */
1183 strcpy(match_buf, &command_ps[cursor]);
1184 /* add match and tail */
1185 sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
1186 command_len = strlen(command_ps);
1187 /* new pos */
1188 pos = cursor + len_found - match_pfx_len;
1189 /* write out the matched command */
1190 redraw(cmdedit_y, command_len - pos);
1191 }
1192# else
1193 {
1194 /* Use 2nd half of match_buf as scratch space - see (**) */
1195 char *command = match_buf + MAX_LINELEN;
1196 int len = save_string(command, MAX_LINELEN);
1197 /* Have space to place the match? */
1198 /* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
1199 if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
1200 int pos;
1201 /* save tail */
1202 strcpy(match_buf, &command[cursor_mb]);
1203 /* where do we want to have cursor after all? */
1204 strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
1205 len = load_string(command, S.maxsize);
1206 /* add match and tail */
1207 sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
1208 command_len = load_string(command, S.maxsize);
1209 /* write out the matched command */
1210 /* paranoia: load_string can return 0 on conv error,
1211 * prevent passing pos = (0 - 12) to redraw */
1212 pos = command_len - len;
1213 redraw(cmdedit_y, pos >= 0 ? pos : 0);
1214 }
1215 }
1216# endif
1217 ret:
1218 free(chosen_match);
1219 free(match_buf);
1220}
1221
1222#endif /* FEATURE_TAB_COMPLETION */
1223
1224
1225line_input_t* FAST_FUNC new_line_input_t(int flags)
1226{
1227 line_input_t *n = xzalloc(sizeof(*n));
1228 n->flags = flags;
1229 return n;
1230}
1231
1232
1233#if MAX_HISTORY > 0
1234
1235static void save_command_ps_at_cur_history(void)
1236{
1237 if (command_ps[0] != BB_NUL) {
1238 int cur = state->cur_history;
1239 free(state->history[cur]);
1240
1241# if ENABLE_UNICODE_SUPPORT
1242 {
1243 char tbuf[MAX_LINELEN];
1244 save_string(tbuf, sizeof(tbuf));
1245 state->history[cur] = xstrdup(tbuf);
1246 }
1247# else
1248 state->history[cur] = xstrdup(command_ps);
1249# endif
1250 }
1251}
1252
1253/* state->flags is already checked to be nonzero */
1254static int get_previous_history(void)
1255{
1256 if ((state->flags & DO_HISTORY) && state->cur_history) {
1257 save_command_ps_at_cur_history();
1258 state->cur_history--;
1259 return 1;
1260 }
1261 beep();
1262 return 0;
1263}
1264
1265static int get_next_history(void)
1266{
1267 if (state->flags & DO_HISTORY) {
1268 if (state->cur_history < state->cnt_history) {
1269 save_command_ps_at_cur_history(); /* save the current history line */
1270 return ++state->cur_history;
1271 }
1272 }
1273 beep();
1274 return 0;
1275}
1276
1277# if ENABLE_FEATURE_EDITING_SAVEHISTORY
1278/* We try to ensure that concurrent additions to the history
1279 * do not overwrite each other.
1280 * Otherwise shell users get unhappy.
1281 *
1282 * History file is trimmed lazily, when it grows several times longer
1283 * than configured MAX_HISTORY lines.
1284 */
1285
1286static void free_line_input_t(line_input_t *n)
1287{
1288 int i = n->cnt_history;
1289 while (i > 0)
1290 free(n->history[--i]);
1291 free(n);
1292}
1293
1294/* state->flags is already checked to be nonzero */
1295static void load_history(line_input_t *st_parm)
1296{
1297 char *temp_h[MAX_HISTORY];
1298 char *line;
1299 FILE *fp;
1300 unsigned idx, i, line_len;
1301
1302 /* NB: do not trash old history if file can't be opened */
1303
1304 fp = fopen_for_read(st_parm->hist_file);
1305 if (fp) {
1306 /* clean up old history */
1307 for (idx = st_parm->cnt_history; idx > 0;) {
1308 idx--;
1309 free(st_parm->history[idx]);
1310 st_parm->history[idx] = NULL;
1311 }
1312
1313 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1314 memset(temp_h, 0, sizeof(temp_h));
1315 st_parm->cnt_history_in_file = idx = 0;
1316 while ((line = xmalloc_fgetline(fp)) != NULL) {
1317 if (line[0] == '\0') {
1318 free(line);
1319 continue;
1320 }
1321 free(temp_h[idx]);
1322 temp_h[idx] = line;
1323 st_parm->cnt_history_in_file++;
1324 idx++;
1325 if (idx == MAX_HISTORY)
1326 idx = 0;
1327 }
1328 fclose(fp);
1329
1330 /* find first non-NULL temp_h[], if any */
1331 if (st_parm->cnt_history_in_file) {
1332 while (temp_h[idx] == NULL) {
1333 idx++;
1334 if (idx == MAX_HISTORY)
1335 idx = 0;
1336 }
1337 }
1338
1339 /* copy temp_h[] to st_parm->history[] */
1340 for (i = 0; i < MAX_HISTORY;) {
1341 line = temp_h[idx];
1342 if (!line)
1343 break;
1344 idx++;
1345 if (idx == MAX_HISTORY)
1346 idx = 0;
1347 line_len = strlen(line);
1348 if (line_len >= MAX_LINELEN)
1349 line[MAX_LINELEN-1] = '\0';
1350 st_parm->history[i++] = line;
1351 }
1352 st_parm->cnt_history = i;
1353 }
1354}
1355
1356/* state->flags is already checked to be nonzero */
1357static void save_history(char *str)
1358{
1359 int fd;
1360 int len, len2;
1361
1362 fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
1363 if (fd < 0)
1364 return;
1365 xlseek(fd, 0, SEEK_END); /* paranoia */
1366 len = strlen(str);
1367 str[len] = '\n'; /* we (try to) do atomic write */
1368 len2 = full_write(fd, str, len + 1);
1369 str[len] = '\0';
1370 close(fd);
1371 if (len2 != len + 1)
1372 return; /* "wtf?" */
1373
1374 /* did we write so much that history file needs trimming? */
1375 state->cnt_history_in_file++;
1376 if (state->cnt_history_in_file > MAX_HISTORY * 4) {
1377 char *new_name;
1378 line_input_t *st_temp;
1379
1380 /* we may have concurrently written entries from others.
1381 * load them */
1382 st_temp = new_line_input_t(state->flags);
1383 st_temp->hist_file = state->hist_file;
1384 load_history(st_temp);
1385
1386 /* write out temp file and replace hist_file atomically */
1387 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1388 fd = open(state->hist_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1389 if (fd >= 0) {
1390 FILE *fp;
1391 int i;
1392
1393 fp = xfdopen_for_write(fd);
1394 for (i = 0; i < st_temp->cnt_history; i++)
1395 fprintf(fp, "%s\n", st_temp->history[i]);
1396 fclose(fp);
1397 if (rename(new_name, state->hist_file) == 0)
1398 state->cnt_history_in_file = st_temp->cnt_history;
1399 }
1400 free(new_name);
1401 free_line_input_t(st_temp);
1402 }
1403}
1404# else
1405# define load_history(a) ((void)0)
1406# define save_history(a) ((void)0)
1407# endif /* FEATURE_COMMAND_SAVEHISTORY */
1408
1409static void remember_in_history(char *str)
1410{
1411 int i;
1412
1413 if (!(state->flags & DO_HISTORY))
1414 return;
1415 if (str[0] == '\0')
1416 return;
1417 i = state->cnt_history;
1418 /* Don't save dupes */
1419 if (i && strcmp(state->history[i-1], str) == 0)
1420 return;
1421
1422 free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1423 state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1424
1425 /* If history[] is full, remove the oldest command */
1426 /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1427 if (i >= MAX_HISTORY) {
1428 free(state->history[0]);
1429 for (i = 0; i < MAX_HISTORY-1; i++)
1430 state->history[i] = state->history[i+1];
1431 /* i == MAX_HISTORY-1 */
1432 }
1433 /* i <= MAX_HISTORY-1 */
1434 state->history[i++] = xstrdup(str);
1435 /* i <= MAX_HISTORY */
1436 state->cur_history = i;
1437 state->cnt_history = i;
1438# if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
1439 if ((state->flags & SAVE_HISTORY) && state->hist_file)
1440 save_history(str);
1441# endif
1442 IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1443}
1444
1445#else /* MAX_HISTORY == 0 */
1446# define remember_in_history(a) ((void)0)
1447#endif /* MAX_HISTORY */
1448
1449
1450#if ENABLE_FEATURE_EDITING_VI
1451/*
1452 * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1453 */
1454static void
1455vi_Word_motion(int eat)
1456{
1457 CHAR_T *command = command_ps;
1458
1459 while (cursor < command_len && !BB_isspace(command[cursor]))
1460 input_forward();
1461 if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1462 input_forward();
1463}
1464
1465static void
1466vi_word_motion(int eat)
1467{
1468 CHAR_T *command = command_ps;
1469
1470 if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1471 while (cursor < command_len
1472 && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1473 ) {
1474 input_forward();
1475 }
1476 } else if (BB_ispunct(command[cursor])) {
1477 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1478 input_forward();
1479 }
1480
1481 if (cursor < command_len)
1482 input_forward();
1483
1484 if (eat) {
1485 while (cursor < command_len && BB_isspace(command[cursor]))
1486 input_forward();
1487 }
1488}
1489
1490static void
1491vi_End_motion(void)
1492{
1493 CHAR_T *command = command_ps;
1494
1495 input_forward();
1496 while (cursor < command_len && BB_isspace(command[cursor]))
1497 input_forward();
1498 while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1499 input_forward();
1500}
1501
1502static void
1503vi_end_motion(void)
1504{
1505 CHAR_T *command = command_ps;
1506
1507 if (cursor >= command_len-1)
1508 return;
1509 input_forward();
1510 while (cursor < command_len-1 && BB_isspace(command[cursor]))
1511 input_forward();
1512 if (cursor >= command_len-1)
1513 return;
1514 if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1515 while (cursor < command_len-1
1516 && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1517 ) {
1518 input_forward();
1519 }
1520 } else if (BB_ispunct(command[cursor])) {
1521 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1522 input_forward();
1523 }
1524}
1525
1526static void
1527vi_Back_motion(void)
1528{
1529 CHAR_T *command = command_ps;
1530
1531 while (cursor > 0 && BB_isspace(command[cursor-1]))
1532 input_backward(1);
1533 while (cursor > 0 && !BB_isspace(command[cursor-1]))
1534 input_backward(1);
1535}
1536
1537static void
1538vi_back_motion(void)
1539{
1540 CHAR_T *command = command_ps;
1541
1542 if (cursor <= 0)
1543 return;
1544 input_backward(1);
1545 while (cursor > 0 && BB_isspace(command[cursor]))
1546 input_backward(1);
1547 if (cursor <= 0)
1548 return;
1549 if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1550 while (cursor > 0
1551 && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1552 ) {
1553 input_backward(1);
1554 }
1555 } else if (BB_ispunct(command[cursor])) {
1556 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1557 input_backward(1);
1558 }
1559}
1560#endif
1561
1562/* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1563static void ctrl_left(void)
1564{
1565 CHAR_T *command = command_ps;
1566
1567 while (1) {
1568 CHAR_T c;
1569
1570 input_backward(1);
1571 if (cursor == 0)
1572 break;
1573 c = command[cursor];
1574 if (c != ' ' && !BB_ispunct(c)) {
1575 /* we reached a "word" delimited by spaces/punct.
1576 * go to its beginning */
1577 while (1) {
1578 c = command[cursor - 1];
1579 if (c == ' ' || BB_ispunct(c))
1580 break;
1581 input_backward(1);
1582 if (cursor == 0)
1583 break;
1584 }
1585 break;
1586 }
1587 }
1588}
1589static void ctrl_right(void)
1590{
1591 CHAR_T *command = command_ps;
1592
1593 while (1) {
1594 CHAR_T c;
1595
1596 c = command[cursor];
1597 if (c == BB_NUL)
1598 break;
1599 if (c != ' ' && !BB_ispunct(c)) {
1600 /* we reached a "word" delimited by spaces/punct.
1601 * go to its end + 1 */
1602 while (1) {
1603 input_forward();
1604 c = command[cursor];
1605 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1606 break;
1607 }
1608 break;
1609 }
1610 input_forward();
1611 }
1612}
1613
1614
1615/*
1616 * read_line_input and its helpers
1617 */
1618
1619#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1620static void ask_terminal(void)
1621{
1622 /* Ask terminal where is the cursor now.
1623 * lineedit_read_key handles response and corrects
1624 * our idea of current cursor position.
1625 * Testcase: run "echo -n long_line_long_line_long_line",
1626 * then type in a long, wrapping command and try to
1627 * delete it using backspace key.
1628 * Note: we print it _after_ prompt, because
1629 * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1630 */
1631 /* Problem: if there is buffered input on stdin,
1632 * the response will be delivered later,
1633 * possibly to an unsuspecting application.
1634 * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1635 * Result:
1636 * ~/srcdevel/bbox/fix/busybox.t4 #
1637 * ~/srcdevel/bbox/fix/busybox.t4 #
1638 * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 # <-- garbage
1639 * ~/srcdevel/bbox/fix/busybox.t4 #
1640 *
1641 * Checking for input with poll only makes the race narrower,
1642 * I still can trigger it. Strace:
1643 *
1644 * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1645 * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout) <-- no input exists
1646 * write(1, "\33[6n", 4) = 4 <-- send the ESC sequence, quick!
1647 * poll([{fd=0, events=POLLIN}], 1, 4294967295) = 1 ([{fd=0, revents=POLLIN}])
1648 * read(0, "\n", 1) = 1 <-- oh crap, user's input got in first
1649 */
1650 struct pollfd pfd;
1651
1652 pfd.fd = STDIN_FILENO;
1653 pfd.events = POLLIN;
1654 if (safe_poll(&pfd, 1, 0) == 0) {
1655 S.sent_ESC_br6n = 1;
1656 fputs(ESC"[6n", stdout);
1657 fflush_all(); /* make terminal see it ASAP! */
1658 }
1659}
1660#else
1661#define ask_terminal() ((void)0)
1662#endif
1663
1664#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1665static void parse_and_put_prompt(const char *prmt_ptr)
1666{
1667 cmdedit_prompt = prmt_ptr;
1668 cmdedit_prmt_len = strlen(prmt_ptr);
1669 put_prompt();
1670}
1671#else
1672static void parse_and_put_prompt(const char *prmt_ptr)
1673{
1674 int prmt_len = 0;
1675 size_t cur_prmt_len = 0;
1676 char flg_not_length = '[';
1677 char *prmt_mem_ptr = xzalloc(1);
1678 char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1679 char cbuf[2];
1680 char c;
1681 char *pbuf;
1682
1683 cmdedit_prmt_len = 0;
1684
1685 if (!cwd_buf) {
1686 cwd_buf = (char *)bb_msg_unknown;
1687 }
1688
1689 cbuf[1] = '\0'; /* never changes */
1690
1691 while (*prmt_ptr) {
1692 char *free_me = NULL;
1693
1694 pbuf = cbuf;
1695 c = *prmt_ptr++;
1696 if (c == '\\') {
1697 const char *cp = prmt_ptr;
1698 int l;
1699
1700 c = bb_process_escape_sequence(&prmt_ptr);
1701 if (prmt_ptr == cp) {
1702 if (*cp == '\0')
1703 break;
1704 c = *prmt_ptr++;
1705
1706 switch (c) {
1707# if ENABLE_USERNAME_OR_HOMEDIR
1708 case 'u':
1709 pbuf = user_buf ? user_buf : (char*)"";
1710 break;
1711# endif
1712 case 'h':
1713 pbuf = free_me = safe_gethostname();
1714 *strchrnul(pbuf, '.') = '\0';
1715 break;
1716 case '$':
1717 c = (geteuid() == 0 ? '#' : '$');
1718 break;
1719# if ENABLE_USERNAME_OR_HOMEDIR
1720 case 'w':
1721 /* /home/user[/something] -> ~[/something] */
1722 pbuf = cwd_buf;
1723 l = strlen(home_pwd_buf);
1724 if (l != 0
1725 && strncmp(home_pwd_buf, cwd_buf, l) == 0
1726 && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1727 && strlen(cwd_buf + l) < PATH_MAX
1728 ) {
1729 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1730 }
1731 break;
1732# endif
1733 case 'W':
1734 pbuf = cwd_buf;
1735 cp = strrchr(pbuf, '/');
1736 if (cp != NULL && cp != pbuf)
1737 pbuf += (cp-pbuf) + 1;
1738 break;
1739 case '!':
1740 pbuf = free_me = xasprintf("%d", num_ok_lines);
1741 break;
1742 case 'e': case 'E': /* \e \E = \033 */
1743 c = '\033';
1744 break;
1745 case 'x': case 'X': {
1746 char buf2[4];
1747 for (l = 0; l < 3;) {
1748 unsigned h;
1749 buf2[l++] = *prmt_ptr;
1750 buf2[l] = '\0';
1751 h = strtoul(buf2, &pbuf, 16);
1752 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1753 buf2[--l] = '\0';
1754 break;
1755 }
1756 prmt_ptr++;
1757 }
1758 c = (char)strtoul(buf2, NULL, 16);
1759 if (c == 0)
1760 c = '?';
1761 pbuf = cbuf;
1762 break;
1763 }
1764 case '[': case ']':
1765 if (c == flg_not_length) {
1766 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1767 continue;
1768 }
1769 break;
1770 } /* switch */
1771 } /* if */
1772 } /* if */
1773 cbuf[0] = c;
1774 cur_prmt_len = strlen(pbuf);
1775 prmt_len += cur_prmt_len;
1776 if (flg_not_length != ']')
1777 cmdedit_prmt_len += cur_prmt_len;
1778 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1779 free(free_me);
1780 } /* while */
1781
1782 if (cwd_buf != (char *)bb_msg_unknown)
1783 free(cwd_buf);
1784 cmdedit_prompt = prmt_mem_ptr;
1785 put_prompt();
1786}
1787#endif
1788
1789static void cmdedit_setwidth(unsigned w, int redraw_flg)
1790{
1791 cmdedit_termw = w;
1792 if (redraw_flg) {
1793 /* new y for current cursor */
1794 int new_y = (cursor + cmdedit_prmt_len) / w;
1795 /* redraw */
1796 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1797 fflush_all();
1798 }
1799}
1800
1801static void win_changed(int nsig)
1802{
1803 int sv_errno = errno;
1804 unsigned width;
1805 get_terminal_width_height(0, &width, NULL);
1806 cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1807 if (nsig == SIGWINCH)
1808 signal(SIGWINCH, win_changed); /* rearm ourself */
1809 errno = sv_errno;
1810}
1811
1812static int lineedit_read_key(char *read_key_buffer)
1813{
1814 int64_t ic;
1815 int timeout = -1;
1816#if ENABLE_UNICODE_SUPPORT
1817 char unicode_buf[MB_CUR_MAX + 1];
1818 int unicode_idx = 0;
1819#endif
1820
1821 while (1) {
1822 /* Wait for input. TIMEOUT = -1 makes read_key wait even
1823 * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
1824 * insist on full MB_CUR_MAX buffer to declare input like
1825 * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
1826 *
1827 * Note: read_key sets errno to 0 on success.
1828 */
1829 ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
1830 if (errno) {
1831#if ENABLE_UNICODE_SUPPORT
1832 if (errno == EAGAIN && unicode_idx != 0)
1833 goto pushback;
1834#endif
1835 break;
1836 }
1837
1838#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1839 if ((int32_t)ic == KEYCODE_CURSOR_POS
1840 && S.sent_ESC_br6n
1841 ) {
1842 S.sent_ESC_br6n = 0;
1843 if (cursor == 0) { /* otherwise it may be bogus */
1844 int col = ((ic >> 32) & 0x7fff) - 1;
1845 if (col > cmdedit_prmt_len) {
1846 cmdedit_x += (col - cmdedit_prmt_len);
1847 while (cmdedit_x >= cmdedit_termw) {
1848 cmdedit_x -= cmdedit_termw;
1849 cmdedit_y++;
1850 }
1851 }
1852 }
1853 continue;
1854 }
1855#endif
1856
1857#if ENABLE_UNICODE_SUPPORT
1858 if (unicode_status == UNICODE_ON) {
1859 wchar_t wc;
1860
1861 if ((int32_t)ic < 0) /* KEYCODE_xxx */
1862 break;
1863 // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
1864
1865 unicode_buf[unicode_idx++] = ic;
1866 unicode_buf[unicode_idx] = '\0';
1867 if (mbstowcs(&wc, unicode_buf, 1) != 1) {
1868 /* Not (yet?) a valid unicode char */
1869 if (unicode_idx < MB_CUR_MAX) {
1870 timeout = 50;
1871 continue;
1872 }
1873 pushback:
1874 /* Invalid sequence. Save all "bad bytes" except first */
1875 read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
1876# if !ENABLE_UNICODE_PRESERVE_BROKEN
1877 ic = CONFIG_SUBST_WCHAR;
1878# else
1879 ic = unicode_mark_raw_byte(unicode_buf[0]);
1880# endif
1881 } else {
1882 /* Valid unicode char, return its code */
1883 ic = wc;
1884 }
1885 }
1886#endif
1887 break;
1888 }
1889
1890 return ic;
1891}
1892
1893#if ENABLE_UNICODE_BIDI_SUPPORT
1894static int isrtl_str(void)
1895{
1896 int idx = cursor;
1897
1898 while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
1899 idx++;
1900 return unicode_bidi_isrtl(command_ps[idx]);
1901}
1902#else
1903# define isrtl_str() 0
1904#endif
1905
1906/* leave out the "vi-mode"-only case labels if vi editing isn't
1907 * configured. */
1908#define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
1909
1910/* convert uppercase ascii to equivalent control char, for readability */
1911#undef CTRL
1912#define CTRL(a) ((a) & ~0x40)
1913
1914/* maxsize must be >= 2.
1915 * Returns:
1916 * -1 on read errors or EOF, or on bare Ctrl-D,
1917 * 0 on ctrl-C (the line entered is still returned in 'command'),
1918 * >0 length of input string, including terminating '\n'
1919 */
1920int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1921{
1922 int len;
1923#if ENABLE_FEATURE_TAB_COMPLETION
1924 smallint lastWasTab = 0;
1925#endif
1926 smallint break_out = 0;
1927#if ENABLE_FEATURE_EDITING_VI
1928 smallint vi_cmdmode = 0;
1929#endif
1930 struct termios initial_settings;
1931 struct termios new_settings;
1932 char read_key_buffer[KEYCODE_BUFFER_SIZE];
1933
1934 INIT_S();
1935
1936 if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1937 || !(initial_settings.c_lflag & ECHO)
1938 ) {
1939 /* Happens when e.g. stty -echo was run before */
1940 parse_and_put_prompt(prompt);
1941 /* fflush_all(); - done by parse_and_put_prompt */
1942 if (fgets(command, maxsize, stdin) == NULL)
1943 len = -1; /* EOF or error */
1944 else
1945 len = strlen(command);
1946 DEINIT_S();
1947 return len;
1948 }
1949
1950 init_unicode();
1951
1952// FIXME: audit & improve this
1953 if (maxsize > MAX_LINELEN)
1954 maxsize = MAX_LINELEN;
1955 S.maxsize = maxsize;
1956
1957 /* With null flags, no other fields are ever used */
1958 state = st ? st : (line_input_t*) &const_int_0;
1959#if MAX_HISTORY > 0
1960# if ENABLE_FEATURE_EDITING_SAVEHISTORY
1961 if ((state->flags & SAVE_HISTORY) && state->hist_file)
1962 if (state->cnt_history == 0)
1963 load_history(state);
1964# endif
1965 if (state->flags & DO_HISTORY)
1966 state->cur_history = state->cnt_history;
1967#endif
1968
1969 /* prepare before init handlers */
1970 cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
1971 command_len = 0;
1972#if ENABLE_UNICODE_SUPPORT
1973 command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
1974#else
1975 command_ps = command;
1976 command[0] = '\0';
1977#endif
1978#define command command_must_not_be_used
1979
1980 new_settings = initial_settings;
1981 new_settings.c_lflag &= ~ICANON; /* unbuffered input */
1982 /* Turn off echoing and CTRL-C, so we can trap it */
1983 new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1984 /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1985 new_settings.c_cc[VMIN] = 1;
1986 new_settings.c_cc[VTIME] = 0;
1987 /* Turn off CTRL-C, so we can trap it */
1988#ifndef _POSIX_VDISABLE
1989# define _POSIX_VDISABLE '\0'
1990#endif
1991 new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1992 tcsetattr_stdin_TCSANOW(&new_settings);
1993
1994 /* Now initialize things */
1995 previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1996 win_changed(0); /* do initial resizing */
1997#if ENABLE_USERNAME_OR_HOMEDIR
1998 {
1999 struct passwd *entry;
2000
2001 entry = getpwuid(geteuid());
2002 if (entry) {
2003 user_buf = xstrdup(entry->pw_name);
2004 home_pwd_buf = xstrdup(entry->pw_dir);
2005 }
2006 }
2007#endif
2008
2009#if 0
2010 for (i = 0; i <= MAX_HISTORY; i++)
2011 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
2012 bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
2013#endif
2014
2015 /* Print out the command prompt, optionally ask where cursor is */
2016 parse_and_put_prompt(prompt);
2017 ask_terminal();
2018
2019 read_key_buffer[0] = 0;
2020 while (1) {
2021 /*
2022 * The emacs and vi modes share much of the code in the big
2023 * command loop. Commands entered when in vi's command mode
2024 * (aka "escape mode") get an extra bit added to distinguish
2025 * them - this keeps them from being self-inserted. This
2026 * clutters the big switch a bit, but keeps all the code
2027 * in one place.
2028 */
2029 enum {
2030 VI_CMDMODE_BIT = 0x40000000,
2031 /* 0x80000000 bit flags KEYCODE_xxx */
2032 };
2033 int32_t ic, ic_raw;
2034
2035 fflush_all();
2036 ic = ic_raw = lineedit_read_key(read_key_buffer);
2037
2038#if ENABLE_FEATURE_EDITING_VI
2039 newdelflag = 1;
2040 if (vi_cmdmode) {
2041 /* btw, since KEYCODE_xxx are all < 0, this doesn't
2042 * change ic if it contains one of them: */
2043 ic |= VI_CMDMODE_BIT;
2044 }
2045#endif
2046
2047 switch (ic) {
2048 case '\n':
2049 case '\r':
2050 vi_case('\n'|VI_CMDMODE_BIT:)
2051 vi_case('\r'|VI_CMDMODE_BIT:)
2052 /* Enter */
2053 goto_new_line();
2054 break_out = 1;
2055 break;
2056 case CTRL('A'):
2057 vi_case('0'|VI_CMDMODE_BIT:)
2058 /* Control-a -- Beginning of line */
2059 input_backward(cursor);
2060 break;
2061 case CTRL('B'):
2062 vi_case('h'|VI_CMDMODE_BIT:)
2063 vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
2064 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
2065 input_backward(1); /* Move back one character */
2066 break;
2067 case CTRL('E'):
2068 vi_case('$'|VI_CMDMODE_BIT:)
2069 /* Control-e -- End of line */
2070 put_till_end_and_adv_cursor();
2071 break;
2072 case CTRL('F'):
2073 vi_case('l'|VI_CMDMODE_BIT:)
2074 vi_case(' '|VI_CMDMODE_BIT:)
2075 input_forward(); /* Move forward one character */
2076 break;
2077 case '\b': /* ^H */
2078 case '\x7f': /* DEL */
2079 if (!isrtl_str())
2080 input_backspace();
2081 else
2082 input_delete(0);
2083 break;
2084 case KEYCODE_DELETE:
2085 if (!isrtl_str())
2086 input_delete(0);
2087 else
2088 input_backspace();
2089 break;
2090#if ENABLE_FEATURE_TAB_COMPLETION
2091 case '\t':
2092 input_tab(&lastWasTab);
2093 break;
2094#endif
2095 case CTRL('K'):
2096 /* Control-k -- clear to end of line */
2097 command_ps[cursor] = BB_NUL;
2098 command_len = cursor;
2099 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
2100 break;
2101 case CTRL('L'):
2102 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
2103 /* Control-l -- clear screen */
2104 printf(ESC"[H"); /* cursor to top,left */
2105 redraw(0, command_len - cursor);
2106 break;
2107#if MAX_HISTORY > 0
2108 case CTRL('N'):
2109 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
2110 vi_case('j'|VI_CMDMODE_BIT:)
2111 /* Control-n -- Get next command in history */
2112 if (get_next_history())
2113 goto rewrite_line;
2114 break;
2115 case CTRL('P'):
2116 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
2117 vi_case('k'|VI_CMDMODE_BIT:)
2118 /* Control-p -- Get previous command from history */
2119 if (get_previous_history())
2120 goto rewrite_line;
2121 break;
2122#endif
2123 case CTRL('U'):
2124 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
2125 /* Control-U -- Clear line before cursor */
2126 if (cursor) {
2127 command_len -= cursor;
2128 memmove(command_ps, command_ps + cursor,
2129 (command_len + 1) * sizeof(command_ps[0]));
2130 redraw(cmdedit_y, command_len);
2131 }
2132 break;
2133 case CTRL('W'):
2134 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
2135 /* Control-W -- Remove the last word */
2136 while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
2137 input_backspace();
2138 while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
2139 input_backspace();
2140 break;
2141
2142#if ENABLE_FEATURE_EDITING_VI
2143 case 'i'|VI_CMDMODE_BIT:
2144 vi_cmdmode = 0;
2145 break;
2146 case 'I'|VI_CMDMODE_BIT:
2147 input_backward(cursor);
2148 vi_cmdmode = 0;
2149 break;
2150 case 'a'|VI_CMDMODE_BIT:
2151 input_forward();
2152 vi_cmdmode = 0;
2153 break;
2154 case 'A'|VI_CMDMODE_BIT:
2155 put_till_end_and_adv_cursor();
2156 vi_cmdmode = 0;
2157 break;
2158 case 'x'|VI_CMDMODE_BIT:
2159 input_delete(1);
2160 break;
2161 case 'X'|VI_CMDMODE_BIT:
2162 if (cursor > 0) {
2163 input_backward(1);
2164 input_delete(1);
2165 }
2166 break;
2167 case 'W'|VI_CMDMODE_BIT:
2168 vi_Word_motion(1);
2169 break;
2170 case 'w'|VI_CMDMODE_BIT:
2171 vi_word_motion(1);
2172 break;
2173 case 'E'|VI_CMDMODE_BIT:
2174 vi_End_motion();
2175 break;
2176 case 'e'|VI_CMDMODE_BIT:
2177 vi_end_motion();
2178 break;
2179 case 'B'|VI_CMDMODE_BIT:
2180 vi_Back_motion();
2181 break;
2182 case 'b'|VI_CMDMODE_BIT:
2183 vi_back_motion();
2184 break;
2185 case 'C'|VI_CMDMODE_BIT:
2186 vi_cmdmode = 0;
2187 /* fall through */
2188 case 'D'|VI_CMDMODE_BIT:
2189 goto clear_to_eol;
2190
2191 case 'c'|VI_CMDMODE_BIT:
2192 vi_cmdmode = 0;
2193 /* fall through */
2194 case 'd'|VI_CMDMODE_BIT: {
2195 int nc, sc;
2196
2197 ic = lineedit_read_key(read_key_buffer);
2198 if (errno) /* error */
2199 goto return_error_indicator;
2200 if (ic == ic_raw) { /* "cc", "dd" */
2201 input_backward(cursor);
2202 goto clear_to_eol;
2203 break;
2204 }
2205
2206 sc = cursor;
2207 switch (ic) {
2208 case 'w':
2209 case 'W':
2210 case 'e':
2211 case 'E':
2212 switch (ic) {
2213 case 'w': /* "dw", "cw" */
2214 vi_word_motion(vi_cmdmode);
2215 break;
2216 case 'W': /* 'dW', 'cW' */
2217 vi_Word_motion(vi_cmdmode);
2218 break;
2219 case 'e': /* 'de', 'ce' */
2220 vi_end_motion();
2221 input_forward();
2222 break;
2223 case 'E': /* 'dE', 'cE' */
2224 vi_End_motion();
2225 input_forward();
2226 break;
2227 }
2228 nc = cursor;
2229 input_backward(cursor - sc);
2230 while (nc-- > cursor)
2231 input_delete(1);
2232 break;
2233 case 'b': /* "db", "cb" */
2234 case 'B': /* implemented as B */
2235 if (ic == 'b')
2236 vi_back_motion();
2237 else
2238 vi_Back_motion();
2239 while (sc-- > cursor)
2240 input_delete(1);
2241 break;
2242 case ' ': /* "d ", "c " */
2243 input_delete(1);
2244 break;
2245 case '$': /* "d$", "c$" */
2246 clear_to_eol:
2247 while (cursor < command_len)
2248 input_delete(1);
2249 break;
2250 }
2251 break;
2252 }
2253 case 'p'|VI_CMDMODE_BIT:
2254 input_forward();
2255 /* fallthrough */
2256 case 'P'|VI_CMDMODE_BIT:
2257 put();
2258 break;
2259 case 'r'|VI_CMDMODE_BIT:
2260//FIXME: unicode case?
2261 ic = lineedit_read_key(read_key_buffer);
2262 if (errno) /* error */
2263 goto return_error_indicator;
2264 if (ic < ' ' || ic > 255) {
2265 beep();
2266 } else {
2267 command_ps[cursor] = ic;
2268 bb_putchar(ic);
2269 bb_putchar('\b');
2270 }
2271 break;
2272 case '\x1b': /* ESC */
2273 if (state->flags & VI_MODE) {
2274 /* insert mode --> command mode */
2275 vi_cmdmode = 1;
2276 input_backward(1);
2277 }
2278 break;
2279#endif /* FEATURE_COMMAND_EDITING_VI */
2280
2281#if MAX_HISTORY > 0
2282 case KEYCODE_UP:
2283 if (get_previous_history())
2284 goto rewrite_line;
2285 beep();
2286 break;
2287 case KEYCODE_DOWN:
2288 if (!get_next_history())
2289 break;
2290 rewrite_line:
2291 /* Rewrite the line with the selected history item */
2292 /* change command */
2293 command_len = load_string(state->history[state->cur_history] ?
2294 state->history[state->cur_history] : "", maxsize);
2295 /* redraw and go to eol (bol, in vi) */
2296 redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2297 break;
2298#endif
2299 case KEYCODE_RIGHT:
2300 input_forward();
2301 break;
2302 case KEYCODE_LEFT:
2303 input_backward(1);
2304 break;
2305 case KEYCODE_CTRL_LEFT:
2306 ctrl_left();
2307 break;
2308 case KEYCODE_CTRL_RIGHT:
2309 ctrl_right();
2310 break;
2311 case KEYCODE_HOME:
2312 input_backward(cursor);
2313 break;
2314 case KEYCODE_END:
2315 put_till_end_and_adv_cursor();
2316 break;
2317
2318 default:
2319 if (initial_settings.c_cc[VINTR] != 0
2320 && ic_raw == initial_settings.c_cc[VINTR]
2321 ) {
2322 /* Ctrl-C (usually) - stop gathering input */
2323 goto_new_line();
2324 command_len = 0;
2325 break_out = -1; /* "do not append '\n'" */
2326 break;
2327 }
2328 if (initial_settings.c_cc[VEOF] != 0
2329 && ic_raw == initial_settings.c_cc[VEOF]
2330 ) {
2331 /* Ctrl-D (usually) - delete one character,
2332 * or exit if len=0 and no chars to delete */
2333 if (command_len == 0) {
2334 errno = 0;
2335
2336 case -1: /* error (e.g. EIO when tty is destroyed) */
2337 IF_FEATURE_EDITING_VI(return_error_indicator:)
2338 break_out = command_len = -1;
2339 break;
2340 }
2341 input_delete(0);
2342 break;
2343 }
2344// /* Control-V -- force insert of next char */
2345// if (c == CTRL('V')) {
2346// if (safe_read(STDIN_FILENO, &c, 1) < 1)
2347// goto return_error_indicator;
2348// if (c == 0) {
2349// beep();
2350// break;
2351// }
2352// }
2353 if (ic < ' '
2354 || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2355 || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2356 ) {
2357 /* If VI_CMDMODE_BIT is set, ic is >= 256
2358 * and vi mode ignores unexpected chars.
2359 * Otherwise, we are here if ic is a
2360 * control char or an unhandled ESC sequence,
2361 * which is also ignored.
2362 */
2363 break;
2364 }
2365 if ((int)command_len >= (maxsize - 2)) {
2366 /* Not enough space for the char and EOL */
2367 break;
2368 }
2369
2370 command_len++;
2371 if (cursor == (command_len - 1)) {
2372 /* We are at the end, append */
2373 command_ps[cursor] = ic;
2374 command_ps[cursor + 1] = BB_NUL;
2375 put_cur_glyph_and_inc_cursor();
2376 if (unicode_bidi_isrtl(ic))
2377 input_backward(1);
2378 } else {
2379 /* In the middle, insert */
2380 int sc = cursor;
2381
2382 memmove(command_ps + sc + 1, command_ps + sc,
2383 (command_len - sc) * sizeof(command_ps[0]));
2384 command_ps[sc] = ic;
2385 /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
2386 if (!isrtl_str())
2387 sc++; /* no */
2388 put_till_end_and_adv_cursor();
2389 /* to prev x pos + 1 */
2390 input_backward(cursor - sc);
2391 }
2392 break;
2393 } /* switch (ic) */
2394
2395 if (break_out)
2396 break;
2397
2398#if ENABLE_FEATURE_TAB_COMPLETION
2399 if (ic_raw != '\t')
2400 lastWasTab = 0;
2401#endif
2402 } /* while (1) */
2403
2404#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2405 if (S.sent_ESC_br6n) {
2406 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2407 * We sent "ESC [ 6 n", but got '\n' first, and
2408 * KEYCODE_CURSOR_POS response is now buffered from terminal.
2409 * It's bad already and not much can be done with it
2410 * (it _will_ be visible for the next process to read stdin),
2411 * but without this delay it even shows up on the screen
2412 * as garbage because we restore echo settings with tcsetattr
2413 * before it comes in. UGLY!
2414 */
2415 usleep(20*1000);
2416 }
2417#endif
2418
2419/* End of bug-catching "command_must_not_be_used" trick */
2420#undef command
2421
2422#if ENABLE_UNICODE_SUPPORT
2423 command[0] = '\0';
2424 if (command_len > 0)
2425 command_len = save_string(command, maxsize - 1);
2426 free(command_ps);
2427#endif
2428
2429 if (command_len > 0)
2430 remember_in_history(command);
2431
2432 if (break_out > 0) {
2433 command[command_len++] = '\n';
2434 command[command_len] = '\0';
2435 }
2436
2437#if ENABLE_FEATURE_TAB_COMPLETION
2438 free_tab_completion_data();
2439#endif
2440
2441 /* restore initial_settings */
2442 tcsetattr_stdin_TCSANOW(&initial_settings);
2443 /* restore SIGWINCH handler */
2444 signal(SIGWINCH, previous_SIGWINCH_handler);
2445 fflush_all();
2446
2447 len = command_len;
2448 DEINIT_S();
2449
2450 return len; /* can't return command_len, DEINIT_S() destroys it */
2451}
2452
2453#else /* !FEATURE_EDITING */
2454
2455#undef read_line_input
2456int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2457{
2458 fputs(prompt, stdout);
2459 fflush_all();
2460 fgets(command, maxsize, stdin);
2461 return strlen(command);
2462}
2463
2464#endif /* !FEATURE_EDITING */
2465
2466
2467/*
2468 * Testing
2469 */
2470
2471#ifdef TEST
2472
2473#include <locale.h>
2474
2475const char *applet_name = "debug stuff usage";
2476
2477int main(int argc, char **argv)
2478{
2479 char buff[MAX_LINELEN];
2480 char *prompt =
2481#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2482 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2483 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2484 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2485#else
2486 "% ";
2487#endif
2488
2489 while (1) {
2490 int l;
2491 l = read_line_input(prompt, buff);
2492 if (l <= 0 || buff[l-1] != '\n')
2493 break;
2494 buff[l-1] = '\0';
2495 printf("*** read_line_input() returned line =%s=\n", buff);
2496 }
2497 printf("*** read_line_input() detect ^D\n");
2498 return 0;
2499}
2500
2501#endif /* TEST */
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