source: MondoRescue/branches/3.3/mindi-busybox/libbb/lineedit.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
  • Property svn:eol-style set to native
File size: 70.7 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 * Unicode in PS1 is not fully supported: prompt length calulation is wrong,
43 * resulting in line wrap problems with long (multi-line) input.
44 *
45 * Multi-line PS1 (e.g. PS1="\n[\w]\n$ ") has problems with history
46 * browsing: up/down arrows result in scrolling.
47 * It stems from simplistic "cmdedit_y = cmdedit_prmt_len / cmdedit_termw"
48 * calculation of how many lines the prompt takes.
49 */
50#include "busybox.h"
51#include "NUM_APPLETS.h"
52#include "unicode.h"
53#ifndef _POSIX_VDISABLE
54# define _POSIX_VDISABLE '\0'
55#endif
56
57
58#ifdef TEST
59# define ENABLE_FEATURE_EDITING 0
60# define ENABLE_FEATURE_TAB_COMPLETION 0
61# define ENABLE_FEATURE_USERNAME_COMPLETION 0
62#endif
63
64
65/* Entire file (except TESTing part) sits inside this #if */
66#if ENABLE_FEATURE_EDITING
67
68
69#define ENABLE_USERNAME_OR_HOMEDIR \
70 (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
71#define IF_USERNAME_OR_HOMEDIR(...)
72#if ENABLE_USERNAME_OR_HOMEDIR
73# undef IF_USERNAME_OR_HOMEDIR
74# define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
75#endif
76
77
78#undef CHAR_T
79#if ENABLE_UNICODE_SUPPORT
80# define BB_NUL ((wchar_t)0)
81# define CHAR_T wchar_t
82static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
83# if ENABLE_FEATURE_EDITING_VI
84static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
85# endif
86static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
87# undef isspace
88# undef isalnum
89# undef ispunct
90# undef isprint
91# define isspace isspace_must_not_be_used
92# define isalnum isalnum_must_not_be_used
93# define ispunct ispunct_must_not_be_used
94# define isprint isprint_must_not_be_used
95#else
96# define BB_NUL '\0'
97# define CHAR_T char
98# define BB_isspace(c) isspace(c)
99# define BB_isalnum(c) isalnum(c)
100# define BB_ispunct(c) ispunct(c)
101#endif
102#if ENABLE_UNICODE_PRESERVE_BROKEN
103# define unicode_mark_raw_byte(wc) ((wc) | 0x20000000)
104# define unicode_is_raw_byte(wc) ((wc) & 0x20000000)
105#else
106# define unicode_is_raw_byte(wc) 0
107#endif
108
109
110#define ESC "\033"
111
112#define SEQ_CLEAR_TILL_END_OF_SCREEN ESC"[J"
113//#define SEQ_CLEAR_TILL_END_OF_LINE ESC"[K"
114
115
116enum {
117 MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
118 ? CONFIG_FEATURE_EDITING_MAX_LEN
119 : 0x7ff0
120};
121
122#if ENABLE_USERNAME_OR_HOMEDIR
123static const char null_str[] ALIGN1 = "";
124#endif
125
126/* We try to minimize both static and stack usage. */
127struct lineedit_statics {
128 line_input_t *state;
129
130 volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
131 sighandler_t previous_SIGWINCH_handler;
132
133 unsigned cmdedit_x; /* real x (col) terminal position */
134 unsigned cmdedit_y; /* pseudoreal y (row) terminal position */
135 unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
136
137 unsigned cursor;
138 int command_len; /* must be signed */
139 /* signed maxsize: we want x in "if (x > S.maxsize)"
140 * to _not_ be promoted to unsigned */
141 int maxsize;
142 CHAR_T *command_ps;
143
144 const char *cmdedit_prompt;
145
146#if ENABLE_USERNAME_OR_HOMEDIR
147 char *user_buf;
148 char *home_pwd_buf; /* = (char*)null_str; */
149#endif
150
151#if ENABLE_FEATURE_TAB_COMPLETION
152 char **matches;
153 unsigned num_matches;
154#endif
155
156#if ENABLE_FEATURE_EDITING_VI
157# define DELBUFSIZ 128
158 CHAR_T *delptr;
159 smallint newdelflag; /* whether delbuf should be reused yet */
160 CHAR_T delbuf[DELBUFSIZ]; /* a place to store deleted characters */
161#endif
162#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
163 smallint sent_ESC_br6n;
164#endif
165};
166
167/* See lineedit_ptr_hack.c */
168extern struct lineedit_statics *const lineedit_ptr_to_statics;
169
170#define S (*lineedit_ptr_to_statics)
171#define state (S.state )
172#define cmdedit_termw (S.cmdedit_termw )
173#define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
174#define cmdedit_x (S.cmdedit_x )
175#define cmdedit_y (S.cmdedit_y )
176#define cmdedit_prmt_len (S.cmdedit_prmt_len)
177#define cursor (S.cursor )
178#define command_len (S.command_len )
179#define command_ps (S.command_ps )
180#define cmdedit_prompt (S.cmdedit_prompt )
181#define user_buf (S.user_buf )
182#define home_pwd_buf (S.home_pwd_buf )
183#define matches (S.matches )
184#define num_matches (S.num_matches )
185#define delptr (S.delptr )
186#define newdelflag (S.newdelflag )
187#define delbuf (S.delbuf )
188
189#define INIT_S() do { \
190 (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
191 barrier(); \
192 cmdedit_termw = 80; \
193 IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
194 IF_FEATURE_EDITING_VI(delptr = delbuf;) \
195} while (0)
196
197static void deinit_S(void)
198{
199#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
200 /* This one is allocated only if FANCY_PROMPT is on
201 * (otherwise it points to verbatim prompt (NOT malloced)) */
202 free((char*)cmdedit_prompt);
203#endif
204#if ENABLE_USERNAME_OR_HOMEDIR
205 free(user_buf);
206 if (home_pwd_buf != null_str)
207 free(home_pwd_buf);
208#endif
209 free(lineedit_ptr_to_statics);
210}
211#define DEINIT_S() deinit_S()
212
213
214#if ENABLE_UNICODE_SUPPORT
215static size_t load_string(const char *src)
216{
217 if (unicode_status == UNICODE_ON) {
218 ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1);
219 if (len < 0)
220 len = 0;
221 command_ps[len] = BB_NUL;
222 return len;
223 } else {
224 unsigned i = 0;
225 while (src[i] && i < S.maxsize - 1) {
226 command_ps[i] = src[i];
227 i++;
228 }
229 command_ps[i] = BB_NUL;
230 return i;
231 }
232}
233static unsigned save_string(char *dst, unsigned maxsize)
234{
235 if (unicode_status == UNICODE_ON) {
236# if !ENABLE_UNICODE_PRESERVE_BROKEN
237 ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
238 if (len < 0)
239 len = 0;
240 dst[len] = '\0';
241 return len;
242# else
243 unsigned dstpos = 0;
244 unsigned srcpos = 0;
245
246 maxsize--;
247 while (dstpos < maxsize) {
248 wchar_t wc;
249 int n = srcpos;
250
251 /* Convert up to 1st invalid byte (or up to end) */
252 while ((wc = command_ps[srcpos]) != BB_NUL
253 && !unicode_is_raw_byte(wc)
254 ) {
255 srcpos++;
256 }
257 command_ps[srcpos] = BB_NUL;
258 n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
259 if (n < 0) /* should not happen */
260 break;
261 dstpos += n;
262 if (wc == BB_NUL) /* usually is */
263 break;
264
265 /* We do have invalid byte here! */
266 command_ps[srcpos] = wc; /* restore it */
267 srcpos++;
268 if (dstpos == maxsize)
269 break;
270 dst[dstpos++] = (char) wc;
271 }
272 dst[dstpos] = '\0';
273 return dstpos;
274# endif
275 } else {
276 unsigned i = 0;
277 while ((dst[i] = command_ps[i]) != 0)
278 i++;
279 return i;
280 }
281}
282/* I thought just fputwc(c, stdout) would work. But no... */
283static void BB_PUTCHAR(wchar_t c)
284{
285 if (unicode_status == UNICODE_ON) {
286 char buf[MB_CUR_MAX + 1];
287 mbstate_t mbst = { 0 };
288 ssize_t len = wcrtomb(buf, c, &mbst);
289 if (len > 0) {
290 buf[len] = '\0';
291 fputs(buf, stdout);
292 }
293 } else {
294 /* In this case, c is always one byte */
295 putchar(c);
296 }
297}
298# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
299static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
300# else
301static wchar_t adjust_width_and_validate_wc(wchar_t wc)
302# define adjust_width_and_validate_wc(width_adj, wc) \
303 ((*(width_adj))++, adjust_width_and_validate_wc(wc))
304# endif
305{
306 int w = 1;
307
308 if (unicode_status == UNICODE_ON) {
309 if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
310 /* note: also true for unicode_is_raw_byte(wc) */
311 goto subst;
312 }
313 w = wcwidth(wc);
314 if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
315 || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
316 || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
317 ) {
318 subst:
319 w = 1;
320 wc = CONFIG_SUBST_WCHAR;
321 }
322 }
323
324# if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
325 *width_adj += w;
326#endif
327 return wc;
328}
329#else /* !UNICODE */
330static size_t load_string(const char *src)
331{
332 safe_strncpy(command_ps, src, S.maxsize);
333 return strlen(command_ps);
334}
335# if ENABLE_FEATURE_TAB_COMPLETION
336static void save_string(char *dst, unsigned maxsize)
337{
338 safe_strncpy(dst, command_ps, maxsize);
339}
340# endif
341# define BB_PUTCHAR(c) bb_putchar(c)
342/* Should never be called: */
343int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
344#endif
345
346
347/* Put 'command_ps[cursor]', cursor++.
348 * Advance cursor on screen. If we reached right margin, scroll text up
349 * and remove terminal margin effect by printing 'next_char' */
350#define HACK_FOR_WRONG_WIDTH 1
351static void put_cur_glyph_and_inc_cursor(void)
352{
353 CHAR_T c = command_ps[cursor];
354 unsigned width = 0;
355 int ofs_to_right;
356
357 if (c == BB_NUL) {
358 /* erase character after end of input string */
359 c = ' ';
360 } else {
361 /* advance cursor only if we aren't at the end yet */
362 cursor++;
363 if (unicode_status == UNICODE_ON) {
364 IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
365 c = adjust_width_and_validate_wc(&cmdedit_x, c);
366 IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
367 } else {
368 cmdedit_x++;
369 }
370 }
371
372 ofs_to_right = cmdedit_x - cmdedit_termw;
373 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
374 /* c fits on this line */
375 BB_PUTCHAR(c);
376 }
377
378 if (ofs_to_right >= 0) {
379 /* we go to the next line */
380#if HACK_FOR_WRONG_WIDTH
381 /* This works better if our idea of term width is wrong
382 * and it is actually wider (often happens on serial lines).
383 * Printing CR,LF *forces* cursor to next line.
384 * OTOH if terminal width is correct AND terminal does NOT
385 * have automargin (IOW: it is moving cursor to next line
386 * by itself (which is wrong for VT-10x terminals)),
387 * this will break things: there will be one extra empty line */
388 puts("\r"); /* + implicit '\n' */
389#else
390 /* VT-10x terminals don't wrap cursor to next line when last char
391 * on the line is printed - cursor stays "over" this char.
392 * Need to print _next_ char too (first one to appear on next line)
393 * to make cursor move down to next line.
394 */
395 /* Works ok only if cmdedit_termw is correct. */
396 c = command_ps[cursor];
397 if (c == BB_NUL)
398 c = ' ';
399 BB_PUTCHAR(c);
400 bb_putchar('\b');
401#endif
402 cmdedit_y++;
403 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
404 width = 0;
405 } else { /* ofs_to_right > 0 */
406 /* wide char c didn't fit on prev line */
407 BB_PUTCHAR(c);
408 }
409 cmdedit_x = width;
410 }
411}
412
413/* Move to end of line (by printing all chars till the end) */
414static void put_till_end_and_adv_cursor(void)
415{
416 while (cursor < command_len)
417 put_cur_glyph_and_inc_cursor();
418}
419
420/* Go to the next line */
421static void goto_new_line(void)
422{
423 put_till_end_and_adv_cursor();
424 if (cmdedit_x != 0)
425 bb_putchar('\n');
426}
427
428static void beep(void)
429{
430 bb_putchar('\007');
431}
432
433static void put_prompt(void)
434{
435 unsigned w;
436
437 fputs(cmdedit_prompt, stdout);
438 fflush_all();
439 cursor = 0;
440 w = cmdedit_termw; /* read volatile var once */
441 cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
442 cmdedit_x = cmdedit_prmt_len % w;
443}
444
445/* Move back one character */
446/* (optimized for slow terminals) */
447static void input_backward(unsigned num)
448{
449 if (num > cursor)
450 num = cursor;
451 if (num == 0)
452 return;
453 cursor -= num;
454
455 if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
456 && unicode_status == UNICODE_ON
457 ) {
458 /* correct NUM to be equal to _screen_ width */
459 int n = num;
460 num = 0;
461 while (--n >= 0)
462 adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
463 if (num == 0)
464 return;
465 }
466
467 if (cmdedit_x >= num) {
468 cmdedit_x -= num;
469 if (num <= 4) {
470 /* This is longer by 5 bytes on x86.
471 * Also gets miscompiled for ARM users
472 * (busybox.net/bugs/view.php?id=2274).
473 * printf(("\b\b\b\b" + 4) - num);
474 * return;
475 */
476 do {
477 bb_putchar('\b');
478 } while (--num);
479 return;
480 }
481 printf(ESC"[%uD", num);
482 return;
483 }
484
485 /* Need to go one or more lines up */
486 if (ENABLE_UNICODE_WIDE_WCHARS) {
487 /* With wide chars, it is hard to "backtrack"
488 * and reliably figure out where to put cursor.
489 * Example (<> is a wide char; # is an ordinary char, _ cursor):
490 * |prompt: <><> |
491 * |<><><><><><> |
492 * |_ |
493 * and user presses left arrow. num = 1, cmdedit_x = 0,
494 * We need to go up one line, and then - how do we know that
495 * we need to go *10* positions to the right? Because
496 * |prompt: <>#<>|
497 * |<><><>#<><><>|
498 * |_ |
499 * in this situation we need to go *11* positions to the right.
500 *
501 * A simpler thing to do is to redraw everything from the start
502 * up to new cursor position (which is already known):
503 */
504 unsigned sv_cursor;
505 /* go to 1st column; go up to first line */
506 printf("\r" ESC"[%uA", cmdedit_y);
507 cmdedit_y = 0;
508 sv_cursor = cursor;
509 put_prompt(); /* sets cursor to 0 */
510 while (cursor < sv_cursor)
511 put_cur_glyph_and_inc_cursor();
512 } else {
513 int lines_up;
514 unsigned width;
515 /* num = chars to go back from the beginning of current line: */
516 num -= cmdedit_x;
517 width = cmdedit_termw; /* read volatile var once */
518 /* num=1...w: one line up, w+1...2w: two, etc: */
519 lines_up = 1 + (num - 1) / width;
520 cmdedit_x = (width * cmdedit_y - num) % width;
521 cmdedit_y -= lines_up;
522 /* go to 1st column; go up */
523 printf("\r" ESC"[%uA", lines_up);
524 /* go to correct column.
525 * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
526 * need to *make sure* we skip it if cmdedit_x == 0 */
527 if (cmdedit_x)
528 printf(ESC"[%uC", cmdedit_x);
529 }
530}
531
532/* draw prompt, editor line, and clear tail */
533static void redraw(int y, int back_cursor)
534{
535 if (y > 0) /* up y lines */
536 printf(ESC"[%uA", y);
537 bb_putchar('\r');
538 put_prompt();
539 put_till_end_and_adv_cursor();
540 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
541 input_backward(back_cursor);
542}
543
544/* Delete the char in front of the cursor, optionally saving it
545 * for later putback */
546#if !ENABLE_FEATURE_EDITING_VI
547static void input_delete(void)
548#define input_delete(save) input_delete()
549#else
550static void input_delete(int save)
551#endif
552{
553 int j = cursor;
554
555 if (j == (int)command_len)
556 return;
557
558#if ENABLE_FEATURE_EDITING_VI
559 if (save) {
560 if (newdelflag) {
561 delptr = delbuf;
562 newdelflag = 0;
563 }
564 if ((delptr - delbuf) < DELBUFSIZ)
565 *delptr++ = command_ps[j];
566 }
567#endif
568
569 memmove(command_ps + j, command_ps + j + 1,
570 /* (command_len + 1 [because of NUL]) - (j + 1)
571 * simplified into (command_len - j) */
572 (command_len - j) * sizeof(command_ps[0]));
573 command_len--;
574 put_till_end_and_adv_cursor();
575 /* Last char is still visible, erase it (and more) */
576 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
577 input_backward(cursor - j); /* back to old pos cursor */
578}
579
580#if ENABLE_FEATURE_EDITING_VI
581static void put(void)
582{
583 int ocursor;
584 int j = delptr - delbuf;
585
586 if (j == 0)
587 return;
588 ocursor = cursor;
589 /* open hole and then fill it */
590 memmove(command_ps + cursor + j, command_ps + cursor,
591 (command_len - cursor + 1) * sizeof(command_ps[0]));
592 memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
593 command_len += j;
594 put_till_end_and_adv_cursor();
595 input_backward(cursor - ocursor - j + 1); /* at end of new text */
596}
597#endif
598
599/* Delete the char in back of the cursor */
600static void input_backspace(void)
601{
602 if (cursor > 0) {
603 input_backward(1);
604 input_delete(0);
605 }
606}
607
608/* Move forward one character */
609static void input_forward(void)
610{
611 if (cursor < command_len)
612 put_cur_glyph_and_inc_cursor();
613}
614
615#if ENABLE_FEATURE_TAB_COMPLETION
616
617//FIXME:
618//needs to be more clever: currently it thinks that "foo\ b<TAB>
619//matches the file named "foo bar", which is untrue.
620//Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
621//not "foo bar <cursor>...
622
623static void free_tab_completion_data(void)
624{
625 if (matches) {
626 while (num_matches)
627 free(matches[--num_matches]);
628 free(matches);
629 matches = NULL;
630 }
631}
632
633static void add_match(char *matched)
634{
635 matches = xrealloc_vector(matches, 4, num_matches);
636 matches[num_matches] = matched;
637 num_matches++;
638}
639
640# if ENABLE_FEATURE_USERNAME_COMPLETION
641/* Replace "~user/..." with "/homedir/...".
642 * The parameter is malloced, free it or return it
643 * unchanged if no user is matched.
644 */
645static char *username_path_completion(char *ud)
646{
647 struct passwd *entry;
648 char *tilde_name = ud;
649 char *home = NULL;
650
651 ud++; /* skip ~ */
652 if (*ud == '/') { /* "~/..." */
653 home = home_pwd_buf;
654 } else {
655 /* "~user/..." */
656 ud = strchr(ud, '/');
657 *ud = '\0'; /* "~user" */
658 entry = getpwnam(tilde_name + 1);
659 *ud = '/'; /* restore "~user/..." */
660 if (entry)
661 home = entry->pw_dir;
662 }
663 if (home) {
664 ud = concat_path_file(home, ud);
665 free(tilde_name);
666 tilde_name = ud;
667 }
668 return tilde_name;
669}
670
671/* ~use<tab> - find all users with this prefix.
672 * Return the length of the prefix used for matching.
673 */
674static NOINLINE unsigned complete_username(const char *ud)
675{
676 struct passwd *pw;
677 unsigned userlen;
678
679 ud++; /* skip ~ */
680 userlen = strlen(ud);
681
682 setpwent();
683 while ((pw = getpwent()) != NULL) {
684 /* Null usernames should result in all users as possible completions. */
685 if (/* !ud[0] || */ is_prefixed_with(pw->pw_name, ud)) {
686 add_match(xasprintf("~%s/", pw->pw_name));
687 }
688 }
689 endpwent(); /* don't keep password file open */
690
691 return 1 + userlen;
692}
693# endif /* FEATURE_USERNAME_COMPLETION */
694
695enum {
696 FIND_EXE_ONLY = 0,
697 FIND_DIR_ONLY = 1,
698 FIND_FILE_ONLY = 2,
699};
700
701static int path_parse(char ***p)
702{
703 int npth;
704 const char *pth;
705 char *tmp;
706 char **res;
707
708 if (state->flags & WITH_PATH_LOOKUP)
709 pth = state->path_lookup;
710 else
711 pth = getenv("PATH");
712
713 /* PATH="" or PATH=":"? */
714 if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
715 return 1;
716
717 tmp = (char*)pth;
718 npth = 1; /* path component count */
719 while (1) {
720 tmp = strchr(tmp, ':');
721 if (!tmp)
722 break;
723 tmp++;
724 if (*tmp == '\0')
725 break; /* :<empty> */
726 npth++;
727 }
728
729 *p = res = xmalloc(npth * sizeof(res[0]));
730 res[0] = tmp = xstrdup(pth);
731 npth = 1;
732 while (1) {
733 tmp = strchr(tmp, ':');
734 if (!tmp)
735 break;
736 *tmp++ = '\0'; /* ':' -> '\0' */
737 if (*tmp == '\0')
738 break; /* :<empty> */
739 res[npth++] = tmp;
740 }
741 return npth;
742}
743
744/* Complete command, directory or file name.
745 * Return the length of the prefix used for matching.
746 */
747static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
748{
749 char *path1[1];
750 char **paths = path1;
751 int npaths;
752 int i;
753 unsigned pf_len;
754 const char *pfind;
755 char *dirbuf = NULL;
756
757 npaths = 1;
758 path1[0] = (char*)".";
759
760 pfind = strrchr(command, '/');
761 if (!pfind) {
762 if (type == FIND_EXE_ONLY)
763 npaths = path_parse(&paths);
764 pfind = command;
765 } else {
766 /* point to 'l' in "..../last_component" */
767 pfind++;
768 /* dirbuf = ".../.../.../" */
769 dirbuf = xstrndup(command, pfind - command);
770# if ENABLE_FEATURE_USERNAME_COMPLETION
771 if (dirbuf[0] == '~') /* ~/... or ~user/... */
772 dirbuf = username_path_completion(dirbuf);
773# endif
774 path1[0] = dirbuf;
775 }
776 pf_len = strlen(pfind);
777
778#if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
779 if (type == FIND_EXE_ONLY) {
780 const char *p = applet_names;
781
782 while (*p) {
783 if (strncmp(pfind, p, pf_len) == 0)
784 add_match(xstrdup(p));
785 while (*p++ != '\0')
786 continue;
787 }
788 }
789#endif
790
791 for (i = 0; i < npaths; i++) {
792 DIR *dir;
793 struct dirent *next;
794 struct stat st;
795 char *found;
796
797 dir = opendir(paths[i]);
798 if (!dir)
799 continue; /* don't print an error */
800
801 while ((next = readdir(dir)) != NULL) {
802 unsigned len;
803 const char *name_found = next->d_name;
804
805 /* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
806 if (!pfind[0] && DOT_OR_DOTDOT(name_found))
807 continue;
808 /* match? */
809 if (!is_prefixed_with(name_found, pfind))
810 continue; /* no */
811
812 found = concat_path_file(paths[i], name_found);
813 /* NB: stat() first so that we see is it a directory;
814 * but if that fails, use lstat() so that
815 * we still match dangling links */
816 if (stat(found, &st) && lstat(found, &st))
817 goto cont; /* hmm, remove in progress? */
818
819 /* Save only name */
820 len = strlen(name_found);
821 found = xrealloc(found, len + 2); /* +2: for slash and NUL */
822 strcpy(found, name_found);
823
824 if (S_ISDIR(st.st_mode)) {
825 /* name is a directory, add slash */
826 found[len] = '/';
827 found[len + 1] = '\0';
828 } else {
829 /* skip files if looking for dirs only (example: cd) */
830 if (type == FIND_DIR_ONLY)
831 goto cont;
832 }
833 /* add it to the list */
834 add_match(found);
835 continue;
836 cont:
837 free(found);
838 }
839 closedir(dir);
840 } /* for every path */
841
842 if (paths != path1) {
843 free(paths[0]); /* allocated memory is only in first member */
844 free(paths);
845 }
846 free(dirbuf);
847
848 return pf_len;
849}
850
851/* build_match_prefix:
852 * On entry, match_buf contains everything up to cursor at the moment <tab>
853 * was pressed. This function looks at it, figures out what part of it
854 * constitutes the command/file/directory prefix to use for completion,
855 * and rewrites match_buf to contain only that part.
856 */
857#define dbg_bmp 0
858/* Helpers: */
859/* QUOT is used on elements of int_buf[], which are bytes,
860 * not Unicode chars. Therefore it works correctly even in Unicode mode.
861 */
862#define QUOT (UCHAR_MAX+1)
863static void remove_chunk(int16_t *int_buf, int beg, int end)
864{
865 /* beg must be <= end */
866 if (beg == end)
867 return;
868
869 while ((int_buf[beg] = int_buf[end]) != 0)
870 beg++, end++;
871
872 if (dbg_bmp) {
873 int i;
874 for (i = 0; int_buf[i]; i++)
875 bb_putchar((unsigned char)int_buf[i]);
876 bb_putchar('\n');
877 }
878}
879/* Caller ensures that match_buf points to a malloced buffer
880 * big enough to hold strlen(match_buf)*2 + 2
881 */
882static NOINLINE int build_match_prefix(char *match_buf)
883{
884 int i, j;
885 int command_mode;
886 int16_t *int_buf = (int16_t*)match_buf;
887
888 if (dbg_bmp) printf("\n%s\n", match_buf);
889
890 /* Copy in reverse order, since they overlap */
891 i = strlen(match_buf);
892 do {
893 int_buf[i] = (unsigned char)match_buf[i];
894 i--;
895 } while (i >= 0);
896
897 /* Mark every \c as "quoted c" */
898 for (i = 0; int_buf[i]; i++) {
899 if (int_buf[i] == '\\') {
900 remove_chunk(int_buf, i, i + 1);
901 int_buf[i] |= QUOT;
902 }
903 }
904 /* Quote-mark "chars" and 'chars', drop delimiters */
905 {
906 int in_quote = 0;
907 i = 0;
908 while (int_buf[i]) {
909 int cur = int_buf[i];
910 if (!cur)
911 break;
912 if (cur == '\'' || cur == '"') {
913 if (!in_quote || (cur == in_quote)) {
914 in_quote ^= cur;
915 remove_chunk(int_buf, i, i + 1);
916 continue;
917 }
918 }
919 if (in_quote)
920 int_buf[i] = cur | QUOT;
921 i++;
922 }
923 }
924
925 /* Remove everything up to command delimiters:
926 * ';' ';;' '&' '|' '&&' '||',
927 * but careful with '>&' '<&' '>|'
928 */
929 for (i = 0; int_buf[i]; i++) {
930 int cur = int_buf[i];
931 if (cur == ';' || cur == '&' || cur == '|') {
932 int prev = i ? int_buf[i - 1] : 0;
933 if (cur == '&' && (prev == '>' || prev == '<')) {
934 continue;
935 } else if (cur == '|' && prev == '>') {
936 continue;
937 }
938 remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
939 i = -1; /* back to square 1 */
940 }
941 }
942 /* Remove all `cmd` */
943 for (i = 0; int_buf[i]; i++) {
944 if (int_buf[i] == '`') {
945 for (j = i + 1; int_buf[j]; j++) {
946 if (int_buf[j] == '`') {
947 /* `cmd` should count as a word:
948 * `cmd` c<tab> should search for files c*,
949 * not commands c*. Therefore we don't drop
950 * `cmd` entirely, we replace it with single `.
951 */
952 remove_chunk(int_buf, i, j);
953 goto next;
954 }
955 }
956 /* No closing ` - command mode, remove all up to ` */
957 remove_chunk(int_buf, 0, i + 1);
958 break;
959 next: ;
960 }
961 }
962
963 /* Remove "cmd (" and "cmd {"
964 * Example: "if { c<tab>"
965 * In this example, c should be matched as command pfx.
966 */
967 for (i = 0; int_buf[i]; i++) {
968 if (int_buf[i] == '(' || int_buf[i] == '{') {
969 remove_chunk(int_buf, 0, i + 1);
970 i = -1; /* back to square 1 */
971 }
972 }
973
974 /* Remove leading unquoted spaces */
975 for (i = 0; int_buf[i]; i++)
976 if (int_buf[i] != ' ')
977 break;
978 remove_chunk(int_buf, 0, i);
979
980 /* Determine completion mode */
981 command_mode = FIND_EXE_ONLY;
982 for (i = 0; int_buf[i]; i++) {
983 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
984 if (int_buf[i] == ' '
985 && command_mode == FIND_EXE_ONLY
986 && (char)int_buf[0] == 'c'
987 && (char)int_buf[1] == 'd'
988 && i == 2 /* -> int_buf[2] == ' ' */
989 ) {
990 command_mode = FIND_DIR_ONLY;
991 } else {
992 command_mode = FIND_FILE_ONLY;
993 break;
994 }
995 }
996 }
997 if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);
998
999 /* Remove everything except last word */
1000 for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
1001 continue;
1002 for (--i; i >= 0; i--) {
1003 int cur = int_buf[i];
1004 if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
1005 remove_chunk(int_buf, 0, i + 1);
1006 break;
1007 }
1008 }
1009
1010 /* Convert back to string of _chars_ */
1011 i = 0;
1012 while ((match_buf[i] = int_buf[i]) != '\0')
1013 i++;
1014
1015 if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);
1016
1017 return command_mode;
1018}
1019
1020/*
1021 * Display by column (original idea from ls applet,
1022 * very optimized by me [Vladimir] :)
1023 */
1024static void showfiles(void)
1025{
1026 int ncols, row;
1027 int column_width = 0;
1028 int nfiles = num_matches;
1029 int nrows = nfiles;
1030 int l;
1031
1032 /* find the longest file name - use that as the column width */
1033 for (row = 0; row < nrows; row++) {
1034 l = unicode_strwidth(matches[row]);
1035 if (column_width < l)
1036 column_width = l;
1037 }
1038 column_width += 2; /* min space for columns */
1039 ncols = cmdedit_termw / column_width;
1040
1041 if (ncols > 1) {
1042 nrows /= ncols;
1043 if (nfiles % ncols)
1044 nrows++; /* round up fractionals */
1045 } else {
1046 ncols = 1;
1047 }
1048 for (row = 0; row < nrows; row++) {
1049 int n = row;
1050 int nc;
1051
1052 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
1053 printf("%s%-*s", matches[n],
1054 (int)(column_width - unicode_strwidth(matches[n])), ""
1055 );
1056 }
1057 if (ENABLE_UNICODE_SUPPORT)
1058 puts(printable_string(NULL, matches[n]));
1059 else
1060 puts(matches[n]);
1061 }
1062}
1063
1064static const char *is_special_char(char c)
1065{
1066 return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
1067}
1068
1069static char *quote_special_chars(char *found)
1070{
1071 int l = 0;
1072 char *s = xzalloc((strlen(found) + 1) * 2);
1073
1074 while (*found) {
1075 if (is_special_char(*found))
1076 s[l++] = '\\';
1077 s[l++] = *found++;
1078 }
1079 /* s[l] = '\0'; - already is */
1080 return s;
1081}
1082
1083/* Do TAB completion */
1084static NOINLINE void input_tab(smallint *lastWasTab)
1085{
1086 char *chosen_match;
1087 char *match_buf;
1088 size_t len_found;
1089 /* Length of string used for matching */
1090 unsigned match_pfx_len = match_pfx_len;
1091 int find_type;
1092# if ENABLE_UNICODE_SUPPORT
1093 /* cursor pos in command converted to multibyte form */
1094 int cursor_mb;
1095# endif
1096 if (!(state->flags & TAB_COMPLETION))
1097 return;
1098
1099 if (*lastWasTab) {
1100 /* The last char was a TAB too.
1101 * Print a list of all the available choices.
1102 */
1103 if (num_matches > 0) {
1104 /* cursor will be changed by goto_new_line() */
1105 int sav_cursor = cursor;
1106 goto_new_line();
1107 showfiles();
1108 redraw(0, command_len - sav_cursor);
1109 }
1110 return;
1111 }
1112
1113 *lastWasTab = 1;
1114 chosen_match = NULL;
1115
1116 /* Make a local copy of the string up to the position of the cursor.
1117 * build_match_prefix will expand it into int16_t's, need to allocate
1118 * twice as much as the string_len+1.
1119 * (we then also (ab)use this extra space later - see (**))
1120 */
1121 match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
1122# if !ENABLE_UNICODE_SUPPORT
1123 save_string(match_buf, cursor + 1); /* +1 for NUL */
1124# else
1125 {
1126 CHAR_T wc = command_ps[cursor];
1127 command_ps[cursor] = BB_NUL;
1128 save_string(match_buf, MAX_LINELEN);
1129 command_ps[cursor] = wc;
1130 cursor_mb = strlen(match_buf);
1131 }
1132# endif
1133 find_type = build_match_prefix(match_buf);
1134
1135 /* Free up any memory already allocated */
1136 free_tab_completion_data();
1137
1138# if ENABLE_FEATURE_USERNAME_COMPLETION
1139 /* If the word starts with ~ and there is no slash in the word,
1140 * then try completing this word as a username. */
1141 if (state->flags & USERNAME_COMPLETION)
1142 if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
1143 match_pfx_len = complete_username(match_buf);
1144# endif
1145 /* If complete_username() did not match,
1146 * try to match a command in $PATH, or a directory, or a file */
1147 if (!matches)
1148 match_pfx_len = complete_cmd_dir_file(match_buf, find_type);
1149
1150 /* Account for backslashes which will be inserted
1151 * by quote_special_chars() later */
1152 {
1153 const char *e = match_buf + strlen(match_buf);
1154 const char *s = e - match_pfx_len;
1155 while (s < e)
1156 if (is_special_char(*s++))
1157 match_pfx_len++;
1158 }
1159
1160 /* Remove duplicates */
1161 if (matches) {
1162 unsigned i, n = 0;
1163 qsort_string_vector(matches, num_matches);
1164 for (i = 0; i < num_matches - 1; ++i) {
1165 //if (matches[i] && matches[i+1]) { /* paranoia */
1166 if (strcmp(matches[i], matches[i+1]) == 0) {
1167 free(matches[i]);
1168 //matches[i] = NULL; /* paranoia */
1169 } else {
1170 matches[n++] = matches[i];
1171 }
1172 //}
1173 }
1174 matches[n++] = matches[i];
1175 num_matches = n;
1176 }
1177
1178 /* Did we find exactly one match? */
1179 if (num_matches != 1) { /* no */
1180 char *cp;
1181 beep();
1182 if (!matches)
1183 goto ret; /* no matches at all */
1184 /* Find common prefix */
1185 chosen_match = xstrdup(matches[0]);
1186 for (cp = chosen_match; *cp; cp++) {
1187 unsigned n;
1188 for (n = 1; n < num_matches; n++) {
1189 if (matches[n][cp - chosen_match] != *cp) {
1190 goto stop;
1191 }
1192 }
1193 }
1194 stop:
1195 if (cp == chosen_match) { /* have unique prefix? */
1196 goto ret; /* no */
1197 }
1198 *cp = '\0';
1199 cp = quote_special_chars(chosen_match);
1200 free(chosen_match);
1201 chosen_match = cp;
1202 len_found = strlen(chosen_match);
1203 } else { /* exactly one match */
1204 /* Next <tab> is not a double-tab */
1205 *lastWasTab = 0;
1206
1207 chosen_match = quote_special_chars(matches[0]);
1208 len_found = strlen(chosen_match);
1209 if (chosen_match[len_found-1] != '/') {
1210 chosen_match[len_found] = ' ';
1211 chosen_match[++len_found] = '\0';
1212 }
1213 }
1214
1215# if !ENABLE_UNICODE_SUPPORT
1216 /* Have space to place the match? */
1217 /* The result consists of three parts with these lengths: */
1218 /* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
1219 /* it simplifies into: */
1220 if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
1221 int pos;
1222 /* save tail */
1223 strcpy(match_buf, &command_ps[cursor]);
1224 /* add match and tail */
1225 sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
1226 command_len = strlen(command_ps);
1227 /* new pos */
1228 pos = cursor + len_found - match_pfx_len;
1229 /* write out the matched command */
1230 redraw(cmdedit_y, command_len - pos);
1231 }
1232# else
1233 {
1234 /* Use 2nd half of match_buf as scratch space - see (**) */
1235 char *command = match_buf + MAX_LINELEN;
1236 int len = save_string(command, MAX_LINELEN);
1237 /* Have space to place the match? */
1238 /* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
1239 if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
1240 int pos;
1241 /* save tail */
1242 strcpy(match_buf, &command[cursor_mb]);
1243 /* where do we want to have cursor after all? */
1244 strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
1245 len = load_string(command);
1246 /* add match and tail */
1247 sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
1248 command_len = load_string(command);
1249 /* write out the matched command */
1250 /* paranoia: load_string can return 0 on conv error,
1251 * prevent passing pos = (0 - 12) to redraw */
1252 pos = command_len - len;
1253 redraw(cmdedit_y, pos >= 0 ? pos : 0);
1254 }
1255 }
1256# endif
1257 ret:
1258 free(chosen_match);
1259 free(match_buf);
1260}
1261
1262#endif /* FEATURE_TAB_COMPLETION */
1263
1264
1265line_input_t* FAST_FUNC new_line_input_t(int flags)
1266{
1267 line_input_t *n = xzalloc(sizeof(*n));
1268 n->flags = flags;
1269#if MAX_HISTORY > 0
1270 n->max_history = MAX_HISTORY;
1271#endif
1272 return n;
1273}
1274
1275
1276#if MAX_HISTORY > 0
1277
1278unsigned FAST_FUNC size_from_HISTFILESIZE(const char *hp)
1279{
1280 int size = MAX_HISTORY;
1281 if (hp) {
1282 size = atoi(hp);
1283 if (size <= 0)
1284 return 1;
1285 if (size > MAX_HISTORY)
1286 return MAX_HISTORY;
1287 }
1288 return size;
1289}
1290
1291static void save_command_ps_at_cur_history(void)
1292{
1293 if (command_ps[0] != BB_NUL) {
1294 int cur = state->cur_history;
1295 free(state->history[cur]);
1296
1297# if ENABLE_UNICODE_SUPPORT
1298 {
1299 char tbuf[MAX_LINELEN];
1300 save_string(tbuf, sizeof(tbuf));
1301 state->history[cur] = xstrdup(tbuf);
1302 }
1303# else
1304 state->history[cur] = xstrdup(command_ps);
1305# endif
1306 }
1307}
1308
1309/* state->flags is already checked to be nonzero */
1310static int get_previous_history(void)
1311{
1312 if ((state->flags & DO_HISTORY) && state->cur_history) {
1313 save_command_ps_at_cur_history();
1314 state->cur_history--;
1315 return 1;
1316 }
1317 beep();
1318 return 0;
1319}
1320
1321static int get_next_history(void)
1322{
1323 if (state->flags & DO_HISTORY) {
1324 if (state->cur_history < state->cnt_history) {
1325 save_command_ps_at_cur_history(); /* save the current history line */
1326 return ++state->cur_history;
1327 }
1328 }
1329 beep();
1330 return 0;
1331}
1332
1333/* Lists command history. Used by shell 'history' builtins */
1334void FAST_FUNC show_history(const line_input_t *st)
1335{
1336 int i;
1337
1338 if (!st)
1339 return;
1340 for (i = 0; i < st->cnt_history; i++)
1341 printf("%4d %s\n", i, st->history[i]);
1342}
1343
1344# if ENABLE_FEATURE_EDITING_SAVEHISTORY
1345/* We try to ensure that concurrent additions to the history
1346 * do not overwrite each other.
1347 * Otherwise shell users get unhappy.
1348 *
1349 * History file is trimmed lazily, when it grows several times longer
1350 * than configured MAX_HISTORY lines.
1351 */
1352
1353static void free_line_input_t(line_input_t *n)
1354{
1355 int i = n->cnt_history;
1356 while (i > 0)
1357 free(n->history[--i]);
1358 free(n);
1359}
1360
1361/* state->flags is already checked to be nonzero */
1362static void load_history(line_input_t *st_parm)
1363{
1364 char *temp_h[MAX_HISTORY];
1365 char *line;
1366 FILE *fp;
1367 unsigned idx, i, line_len;
1368
1369 /* NB: do not trash old history if file can't be opened */
1370
1371 fp = fopen_for_read(st_parm->hist_file);
1372 if (fp) {
1373 /* clean up old history */
1374 for (idx = st_parm->cnt_history; idx > 0;) {
1375 idx--;
1376 free(st_parm->history[idx]);
1377 st_parm->history[idx] = NULL;
1378 }
1379
1380 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1381 memset(temp_h, 0, sizeof(temp_h));
1382 idx = 0;
1383 st_parm->cnt_history_in_file = 0;
1384 while ((line = xmalloc_fgetline(fp)) != NULL) {
1385 if (line[0] == '\0') {
1386 free(line);
1387 continue;
1388 }
1389 free(temp_h[idx]);
1390 temp_h[idx] = line;
1391 st_parm->cnt_history_in_file++;
1392 idx++;
1393 if (idx == st_parm->max_history)
1394 idx = 0;
1395 }
1396 fclose(fp);
1397
1398 /* find first non-NULL temp_h[], if any */
1399 if (st_parm->cnt_history_in_file) {
1400 while (temp_h[idx] == NULL) {
1401 idx++;
1402 if (idx == st_parm->max_history)
1403 idx = 0;
1404 }
1405 }
1406
1407 /* copy temp_h[] to st_parm->history[] */
1408 for (i = 0; i < st_parm->max_history;) {
1409 line = temp_h[idx];
1410 if (!line)
1411 break;
1412 idx++;
1413 if (idx == st_parm->max_history)
1414 idx = 0;
1415 line_len = strlen(line);
1416 if (line_len >= MAX_LINELEN)
1417 line[MAX_LINELEN-1] = '\0';
1418 st_parm->history[i++] = line;
1419 }
1420 st_parm->cnt_history = i;
1421 if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT)
1422 st_parm->cnt_history_in_file = i;
1423 }
1424}
1425
1426# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1427void save_history(line_input_t *st)
1428{
1429 FILE *fp;
1430
1431 if (!st->hist_file)
1432 return;
1433 if (st->cnt_history <= st->cnt_history_in_file)
1434 return;
1435
1436 fp = fopen(st->hist_file, "a");
1437 if (fp) {
1438 int i, fd;
1439 char *new_name;
1440 line_input_t *st_temp;
1441
1442 for (i = st->cnt_history_in_file; i < st->cnt_history; i++)
1443 fprintf(fp, "%s\n", st->history[i]);
1444 fclose(fp);
1445
1446 /* we may have concurrently written entries from others.
1447 * load them */
1448 st_temp = new_line_input_t(st->flags);
1449 st_temp->hist_file = st->hist_file;
1450 st_temp->max_history = st->max_history;
1451 load_history(st_temp);
1452
1453 /* write out temp file and replace hist_file atomically */
1454 new_name = xasprintf("%s.%u.new", st->hist_file, (int) getpid());
1455 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1456 if (fd >= 0) {
1457 fp = xfdopen_for_write(fd);
1458 for (i = 0; i < st_temp->cnt_history; i++)
1459 fprintf(fp, "%s\n", st_temp->history[i]);
1460 fclose(fp);
1461 if (rename(new_name, st->hist_file) == 0)
1462 st->cnt_history_in_file = st_temp->cnt_history;
1463 }
1464 free(new_name);
1465 free_line_input_t(st_temp);
1466 }
1467}
1468# else
1469static void save_history(char *str)
1470{
1471 int fd;
1472 int len, len2;
1473
1474 if (!state->hist_file)
1475 return;
1476
1477 fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
1478 if (fd < 0)
1479 return;
1480 xlseek(fd, 0, SEEK_END); /* paranoia */
1481 len = strlen(str);
1482 str[len] = '\n'; /* we (try to) do atomic write */
1483 len2 = full_write(fd, str, len + 1);
1484 str[len] = '\0';
1485 close(fd);
1486 if (len2 != len + 1)
1487 return; /* "wtf?" */
1488
1489 /* did we write so much that history file needs trimming? */
1490 state->cnt_history_in_file++;
1491 if (state->cnt_history_in_file > state->max_history * 4) {
1492 char *new_name;
1493 line_input_t *st_temp;
1494
1495 /* we may have concurrently written entries from others.
1496 * load them */
1497 st_temp = new_line_input_t(state->flags);
1498 st_temp->hist_file = state->hist_file;
1499 st_temp->max_history = state->max_history;
1500 load_history(st_temp);
1501
1502 /* write out temp file and replace hist_file atomically */
1503 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1504 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1505 if (fd >= 0) {
1506 FILE *fp;
1507 int i;
1508
1509 fp = xfdopen_for_write(fd);
1510 for (i = 0; i < st_temp->cnt_history; i++)
1511 fprintf(fp, "%s\n", st_temp->history[i]);
1512 fclose(fp);
1513 if (rename(new_name, state->hist_file) == 0)
1514 state->cnt_history_in_file = st_temp->cnt_history;
1515 }
1516 free(new_name);
1517 free_line_input_t(st_temp);
1518 }
1519}
1520# endif
1521# else
1522# define load_history(a) ((void)0)
1523# define save_history(a) ((void)0)
1524# endif /* FEATURE_COMMAND_SAVEHISTORY */
1525
1526static void remember_in_history(char *str)
1527{
1528 int i;
1529
1530 if (!(state->flags & DO_HISTORY))
1531 return;
1532 if (str[0] == '\0')
1533 return;
1534 i = state->cnt_history;
1535 /* Don't save dupes */
1536 if (i && strcmp(state->history[i-1], str) == 0)
1537 return;
1538
1539 free(state->history[state->max_history]); /* redundant, paranoia */
1540 state->history[state->max_history] = NULL; /* redundant, paranoia */
1541
1542 /* If history[] is full, remove the oldest command */
1543 /* we need to keep history[state->max_history] empty, hence >=, not > */
1544 if (i >= state->max_history) {
1545 free(state->history[0]);
1546 for (i = 0; i < state->max_history-1; i++)
1547 state->history[i] = state->history[i+1];
1548 /* i == state->max_history-1 */
1549# if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1550 if (state->cnt_history_in_file)
1551 state->cnt_history_in_file--;
1552# endif
1553 }
1554 /* i <= state->max_history-1 */
1555 state->history[i++] = xstrdup(str);
1556 /* i <= state->max_history */
1557 state->cur_history = i;
1558 state->cnt_history = i;
1559# if ENABLE_FEATURE_EDITING_SAVEHISTORY && !ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1560 save_history(str);
1561# endif
1562}
1563
1564#else /* MAX_HISTORY == 0 */
1565# define remember_in_history(a) ((void)0)
1566#endif /* MAX_HISTORY */
1567
1568
1569#if ENABLE_FEATURE_EDITING_VI
1570/*
1571 * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1572 */
1573static void
1574vi_Word_motion(int eat)
1575{
1576 CHAR_T *command = command_ps;
1577
1578 while (cursor < command_len && !BB_isspace(command[cursor]))
1579 input_forward();
1580 if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1581 input_forward();
1582}
1583
1584static void
1585vi_word_motion(int eat)
1586{
1587 CHAR_T *command = command_ps;
1588
1589 if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1590 while (cursor < command_len
1591 && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1592 ) {
1593 input_forward();
1594 }
1595 } else if (BB_ispunct(command[cursor])) {
1596 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1597 input_forward();
1598 }
1599
1600 if (cursor < command_len)
1601 input_forward();
1602
1603 if (eat) {
1604 while (cursor < command_len && BB_isspace(command[cursor]))
1605 input_forward();
1606 }
1607}
1608
1609static void
1610vi_End_motion(void)
1611{
1612 CHAR_T *command = command_ps;
1613
1614 input_forward();
1615 while (cursor < command_len && BB_isspace(command[cursor]))
1616 input_forward();
1617 while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1618 input_forward();
1619}
1620
1621static void
1622vi_end_motion(void)
1623{
1624 CHAR_T *command = command_ps;
1625
1626 if (cursor >= command_len-1)
1627 return;
1628 input_forward();
1629 while (cursor < command_len-1 && BB_isspace(command[cursor]))
1630 input_forward();
1631 if (cursor >= command_len-1)
1632 return;
1633 if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1634 while (cursor < command_len-1
1635 && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1636 ) {
1637 input_forward();
1638 }
1639 } else if (BB_ispunct(command[cursor])) {
1640 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1641 input_forward();
1642 }
1643}
1644
1645static void
1646vi_Back_motion(void)
1647{
1648 CHAR_T *command = command_ps;
1649
1650 while (cursor > 0 && BB_isspace(command[cursor-1]))
1651 input_backward(1);
1652 while (cursor > 0 && !BB_isspace(command[cursor-1]))
1653 input_backward(1);
1654}
1655
1656static void
1657vi_back_motion(void)
1658{
1659 CHAR_T *command = command_ps;
1660
1661 if (cursor <= 0)
1662 return;
1663 input_backward(1);
1664 while (cursor > 0 && BB_isspace(command[cursor]))
1665 input_backward(1);
1666 if (cursor <= 0)
1667 return;
1668 if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1669 while (cursor > 0
1670 && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1671 ) {
1672 input_backward(1);
1673 }
1674 } else if (BB_ispunct(command[cursor])) {
1675 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1676 input_backward(1);
1677 }
1678}
1679#endif
1680
1681/* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1682static void ctrl_left(void)
1683{
1684 CHAR_T *command = command_ps;
1685
1686 while (1) {
1687 CHAR_T c;
1688
1689 input_backward(1);
1690 if (cursor == 0)
1691 break;
1692 c = command[cursor];
1693 if (c != ' ' && !BB_ispunct(c)) {
1694 /* we reached a "word" delimited by spaces/punct.
1695 * go to its beginning */
1696 while (1) {
1697 c = command[cursor - 1];
1698 if (c == ' ' || BB_ispunct(c))
1699 break;
1700 input_backward(1);
1701 if (cursor == 0)
1702 break;
1703 }
1704 break;
1705 }
1706 }
1707}
1708static void ctrl_right(void)
1709{
1710 CHAR_T *command = command_ps;
1711
1712 while (1) {
1713 CHAR_T c;
1714
1715 c = command[cursor];
1716 if (c == BB_NUL)
1717 break;
1718 if (c != ' ' && !BB_ispunct(c)) {
1719 /* we reached a "word" delimited by spaces/punct.
1720 * go to its end + 1 */
1721 while (1) {
1722 input_forward();
1723 c = command[cursor];
1724 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1725 break;
1726 }
1727 break;
1728 }
1729 input_forward();
1730 }
1731}
1732
1733
1734/*
1735 * read_line_input and its helpers
1736 */
1737
1738#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1739static void ask_terminal(void)
1740{
1741 /* Ask terminal where is the cursor now.
1742 * lineedit_read_key handles response and corrects
1743 * our idea of current cursor position.
1744 * Testcase: run "echo -n long_line_long_line_long_line",
1745 * then type in a long, wrapping command and try to
1746 * delete it using backspace key.
1747 * Note: we print it _after_ prompt, because
1748 * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1749 */
1750 /* Problem: if there is buffered input on stdin,
1751 * the response will be delivered later,
1752 * possibly to an unsuspecting application.
1753 * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1754 * Result:
1755 * ~/srcdevel/bbox/fix/busybox.t4 #
1756 * ~/srcdevel/bbox/fix/busybox.t4 #
1757 * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 # <-- garbage
1758 * ~/srcdevel/bbox/fix/busybox.t4 #
1759 *
1760 * Checking for input with poll only makes the race narrower,
1761 * I still can trigger it. Strace:
1762 *
1763 * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1764 * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout) <-- no input exists
1765 * write(1, "\33[6n", 4) = 4 <-- send the ESC sequence, quick!
1766 * poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
1767 * read(0, "\n", 1) = 1 <-- oh crap, user's input got in first
1768 */
1769 struct pollfd pfd;
1770
1771 pfd.fd = STDIN_FILENO;
1772 pfd.events = POLLIN;
1773 if (safe_poll(&pfd, 1, 0) == 0) {
1774 S.sent_ESC_br6n = 1;
1775 fputs(ESC"[6n", stdout);
1776 fflush_all(); /* make terminal see it ASAP! */
1777 }
1778}
1779#else
1780#define ask_terminal() ((void)0)
1781#endif
1782
1783/* Called just once at read_line_input() init time */
1784#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1785static void parse_and_put_prompt(const char *prmt_ptr)
1786{
1787 const char *p;
1788 cmdedit_prompt = prmt_ptr;
1789 p = strrchr(prmt_ptr, '\n');
1790 cmdedit_prmt_len = unicode_strwidth(p ? p+1 : prmt_ptr);
1791 put_prompt();
1792}
1793#else
1794static void parse_and_put_prompt(const char *prmt_ptr)
1795{
1796 int prmt_size = 0;
1797 char *prmt_mem_ptr = xzalloc(1);
1798# if ENABLE_USERNAME_OR_HOMEDIR
1799 char *cwd_buf = NULL;
1800# endif
1801 char flg_not_length = '[';
1802 char cbuf[2];
1803
1804 /*cmdedit_prmt_len = 0; - already is */
1805
1806 cbuf[1] = '\0'; /* never changes */
1807
1808 while (*prmt_ptr) {
1809 char timebuf[sizeof("HH:MM:SS")];
1810 char *free_me = NULL;
1811 char *pbuf;
1812 char c;
1813
1814 pbuf = cbuf;
1815 c = *prmt_ptr++;
1816 if (c == '\\') {
1817 const char *cp;
1818 int l;
1819/*
1820 * Supported via bb_process_escape_sequence:
1821 * \a ASCII bell character (07)
1822 * \e ASCII escape character (033)
1823 * \n newline
1824 * \r carriage return
1825 * \\ backslash
1826 * \nnn char with octal code nnn
1827 * Supported:
1828 * \$ if the effective UID is 0, a #, otherwise a $
1829 * \w current working directory, with $HOME abbreviated with a tilde
1830 * Note: we do not support $PROMPT_DIRTRIM=n feature
1831 * \W basename of the current working directory, with $HOME abbreviated with a tilde
1832 * \h hostname up to the first '.'
1833 * \H hostname
1834 * \u username
1835 * \[ begin a sequence of non-printing characters
1836 * \] end a sequence of non-printing characters
1837 * \T current time in 12-hour HH:MM:SS format
1838 * \@ current time in 12-hour am/pm format
1839 * \A current time in 24-hour HH:MM format
1840 * \t current time in 24-hour HH:MM:SS format
1841 * (all of the above work as \A)
1842 * Not supported:
1843 * \! history number of this command
1844 * \# command number of this command
1845 * \j number of jobs currently managed by the shell
1846 * \l basename of the shell's terminal device name
1847 * \s name of the shell, the basename of $0 (the portion following the final slash)
1848 * \V release of bash, version + patch level (e.g., 2.00.0)
1849 * \d date in "Weekday Month Date" format (e.g., "Tue May 26")
1850 * \D{format}
1851 * format is passed to strftime(3).
1852 * An empty format results in a locale-specific time representation.
1853 * The braces are required.
1854 * Mishandled by bb_process_escape_sequence:
1855 * \v version of bash (e.g., 2.00)
1856 */
1857 cp = prmt_ptr;
1858 c = *cp;
1859 if (c != 't') /* don't treat \t as tab */
1860 c = bb_process_escape_sequence(&prmt_ptr);
1861 if (prmt_ptr == cp) {
1862 if (*cp == '\0')
1863 break;
1864 c = *prmt_ptr++;
1865
1866 switch (c) {
1867# if ENABLE_USERNAME_OR_HOMEDIR
1868 case 'u':
1869 pbuf = user_buf ? user_buf : (char*)"";
1870 break;
1871# endif
1872 case 'H':
1873 case 'h':
1874 pbuf = free_me = safe_gethostname();
1875 if (c == 'h')
1876 strchrnul(pbuf, '.')[0] = '\0';
1877 break;
1878 case '$':
1879 c = (geteuid() == 0 ? '#' : '$');
1880 break;
1881 case 'T': /* 12-hour HH:MM:SS format */
1882 case '@': /* 12-hour am/pm format */
1883 case 'A': /* 24-hour HH:MM format */
1884 case 't': /* 24-hour HH:MM:SS format */
1885 /* We show all of them as 24-hour HH:MM */
1886 strftime_HHMMSS(timebuf, sizeof(timebuf), NULL)[-3] = '\0';
1887 pbuf = timebuf;
1888 break;
1889# if ENABLE_USERNAME_OR_HOMEDIR
1890 case 'w': /* current dir */
1891 case 'W': /* basename of cur dir */
1892 if (!cwd_buf) {
1893 cwd_buf = xrealloc_getcwd_or_warn(NULL);
1894 if (!cwd_buf)
1895 cwd_buf = (char *)bb_msg_unknown;
1896 else if (home_pwd_buf[0]) {
1897 char *after_home_user;
1898
1899 /* /home/user[/something] -> ~[/something] */
1900 after_home_user = is_prefixed_with(cwd_buf, home_pwd_buf);
1901 if (after_home_user
1902 && (*after_home_user == '/' || *after_home_user == '\0')
1903 ) {
1904 cwd_buf[0] = '~';
1905 overlapping_strcpy(cwd_buf + 1, after_home_user);
1906 }
1907 }
1908 }
1909 pbuf = cwd_buf;
1910 if (c == 'w')
1911 break;
1912 cp = strrchr(pbuf, '/');
1913 if (cp)
1914 pbuf = (char*)cp + 1;
1915 break;
1916# endif
1917// bb_process_escape_sequence does this now:
1918// case 'e': case 'E': /* \e \E = \033 */
1919// c = '\033';
1920// break;
1921 case 'x': case 'X': {
1922 char buf2[4];
1923 for (l = 0; l < 3;) {
1924 unsigned h;
1925 buf2[l++] = *prmt_ptr;
1926 buf2[l] = '\0';
1927 h = strtoul(buf2, &pbuf, 16);
1928 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1929 buf2[--l] = '\0';
1930 break;
1931 }
1932 prmt_ptr++;
1933 }
1934 c = (char)strtoul(buf2, NULL, 16);
1935 if (c == 0)
1936 c = '?';
1937 pbuf = cbuf;
1938 break;
1939 }
1940 case '[': case ']':
1941 if (c == flg_not_length) {
1942 /* Toggle '['/']' hex 5b/5d */
1943 flg_not_length ^= 6;
1944 continue;
1945 }
1946 break;
1947 } /* switch */
1948 } /* if */
1949 } /* if */
1950 cbuf[0] = c;
1951 {
1952 int n = strlen(pbuf);
1953 prmt_size += n;
1954 if (c == '\n')
1955 cmdedit_prmt_len = 0;
1956 else if (flg_not_length != ']') {
1957#if 0 /*ENABLE_UNICODE_SUPPORT*/
1958/* Won't work, pbuf is one BYTE string here instead of an one Unicode char string. */
1959/* FIXME */
1960 cmdedit_prmt_len += unicode_strwidth(pbuf);
1961#else
1962 cmdedit_prmt_len += n;
1963#endif
1964 }
1965 }
1966 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_size+1), pbuf);
1967 free(free_me);
1968 } /* while */
1969
1970# if ENABLE_USERNAME_OR_HOMEDIR
1971 if (cwd_buf != (char *)bb_msg_unknown)
1972 free(cwd_buf);
1973# endif
1974 cmdedit_prompt = prmt_mem_ptr;
1975 put_prompt();
1976}
1977#endif
1978
1979static void cmdedit_setwidth(unsigned w, int redraw_flg)
1980{
1981 cmdedit_termw = w;
1982 if (redraw_flg) {
1983 /* new y for current cursor */
1984 int new_y = (cursor + cmdedit_prmt_len) / w;
1985 /* redraw */
1986 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1987 fflush_all();
1988 }
1989}
1990
1991static void win_changed(int nsig)
1992{
1993 int sv_errno = errno;
1994 unsigned width;
1995
1996 get_terminal_width_height(0, &width, NULL);
1997//FIXME: cmdedit_setwidth() -> redraw() -> printf() -> KABOOM! (we are in signal handler!)
1998 cmdedit_setwidth(width, /*redraw_flg:*/ nsig);
1999
2000 errno = sv_errno;
2001}
2002
2003static int lineedit_read_key(char *read_key_buffer, int timeout)
2004{
2005 int64_t ic;
2006#if ENABLE_UNICODE_SUPPORT
2007 char unicode_buf[MB_CUR_MAX + 1];
2008 int unicode_idx = 0;
2009#endif
2010
2011 while (1) {
2012 /* Wait for input. TIMEOUT = -1 makes read_key wait even
2013 * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
2014 * insist on full MB_CUR_MAX buffer to declare input like
2015 * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
2016 *
2017 * Note: read_key sets errno to 0 on success.
2018 */
2019 ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
2020 if (errno) {
2021#if ENABLE_UNICODE_SUPPORT
2022 if (errno == EAGAIN && unicode_idx != 0)
2023 goto pushback;
2024#endif
2025 break;
2026 }
2027
2028#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2029 if ((int32_t)ic == KEYCODE_CURSOR_POS
2030 && S.sent_ESC_br6n
2031 ) {
2032 S.sent_ESC_br6n = 0;
2033 if (cursor == 0) { /* otherwise it may be bogus */
2034 int col = ((ic >> 32) & 0x7fff) - 1;
2035 /*
2036 * Is col > cmdedit_prmt_len?
2037 * If yes (terminal says cursor is farther to the right
2038 * of where we think it should be),
2039 * the prompt wasn't printed starting at col 1,
2040 * there was additional text before it.
2041 */
2042 if ((int)(col - cmdedit_prmt_len) > 0) {
2043 /* Fix our understanding of current x position */
2044 cmdedit_x += (col - cmdedit_prmt_len);
2045 while (cmdedit_x >= cmdedit_termw) {
2046 cmdedit_x -= cmdedit_termw;
2047 cmdedit_y++;
2048 }
2049 }
2050 }
2051 continue;
2052 }
2053#endif
2054
2055#if ENABLE_UNICODE_SUPPORT
2056 if (unicode_status == UNICODE_ON) {
2057 wchar_t wc;
2058
2059 if ((int32_t)ic < 0) /* KEYCODE_xxx */
2060 break;
2061 // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
2062
2063 unicode_buf[unicode_idx++] = ic;
2064 unicode_buf[unicode_idx] = '\0';
2065 if (mbstowcs(&wc, unicode_buf, 1) != 1) {
2066 /* Not (yet?) a valid unicode char */
2067 if (unicode_idx < MB_CUR_MAX) {
2068 timeout = 50;
2069 continue;
2070 }
2071 pushback:
2072 /* Invalid sequence. Save all "bad bytes" except first */
2073 read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
2074# if !ENABLE_UNICODE_PRESERVE_BROKEN
2075 ic = CONFIG_SUBST_WCHAR;
2076# else
2077 ic = unicode_mark_raw_byte(unicode_buf[0]);
2078# endif
2079 } else {
2080 /* Valid unicode char, return its code */
2081 ic = wc;
2082 }
2083 }
2084#endif
2085 break;
2086 }
2087
2088 return ic;
2089}
2090
2091#if ENABLE_UNICODE_BIDI_SUPPORT
2092static int isrtl_str(void)
2093{
2094 int idx = cursor;
2095
2096 while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
2097 idx++;
2098 return unicode_bidi_isrtl(command_ps[idx]);
2099}
2100#else
2101# define isrtl_str() 0
2102#endif
2103
2104/* leave out the "vi-mode"-only case labels if vi editing isn't
2105 * configured. */
2106#define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
2107
2108/* convert uppercase ascii to equivalent control char, for readability */
2109#undef CTRL
2110#define CTRL(a) ((a) & ~0x40)
2111
2112enum {
2113 VI_CMDMODE_BIT = 0x40000000,
2114 /* 0x80000000 bit flags KEYCODE_xxx */
2115};
2116
2117#if ENABLE_FEATURE_REVERSE_SEARCH
2118/* Mimic readline Ctrl-R reverse history search.
2119 * When invoked, it shows the following prompt:
2120 * (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R]
2121 * and typing results in search being performed:
2122 * (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp]
2123 * Search is performed by looking at progressively older lines in history.
2124 * Ctrl-R again searches for the next match in history.
2125 * Backspace deletes last matched char.
2126 * Control keys exit search and return to normal editing (at current history line).
2127 */
2128static int32_t reverse_i_search(void)
2129{
2130 char match_buf[128]; /* for user input */
2131 char read_key_buffer[KEYCODE_BUFFER_SIZE];
2132 const char *matched_history_line;
2133 const char *saved_prompt;
2134 unsigned saved_prmt_len;
2135 int32_t ic;
2136
2137 matched_history_line = NULL;
2138 read_key_buffer[0] = 0;
2139 match_buf[0] = '\0';
2140
2141 /* Save and replace the prompt */
2142 saved_prompt = cmdedit_prompt;
2143 saved_prmt_len = cmdedit_prmt_len;
2144 goto set_prompt;
2145
2146 while (1) {
2147 int h;
2148 unsigned match_buf_len = strlen(match_buf);
2149
2150 fflush_all();
2151//FIXME: correct timeout?
2152 ic = lineedit_read_key(read_key_buffer, -1);
2153
2154 switch (ic) {
2155 case CTRL('R'): /* searching for the next match */
2156 break;
2157
2158 case '\b':
2159 case '\x7f':
2160 /* Backspace */
2161 if (unicode_status == UNICODE_ON) {
2162 while (match_buf_len != 0) {
2163 uint8_t c = match_buf[--match_buf_len];
2164 if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */
2165 break; /* yes */
2166 }
2167 } else {
2168 if (match_buf_len != 0)
2169 match_buf_len--;
2170 }
2171 match_buf[match_buf_len] = '\0';
2172 break;
2173
2174 default:
2175 if (ic < ' '
2176 || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2177 || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2178 ) {
2179 goto ret;
2180 }
2181
2182 /* Append this char */
2183#if ENABLE_UNICODE_SUPPORT
2184 if (unicode_status == UNICODE_ON) {
2185 mbstate_t mbstate = { 0 };
2186 char buf[MB_CUR_MAX + 1];
2187 int len = wcrtomb(buf, ic, &mbstate);
2188 if (len > 0) {
2189 buf[len] = '\0';
2190 if (match_buf_len + len < sizeof(match_buf))
2191 strcpy(match_buf + match_buf_len, buf);
2192 }
2193 } else
2194#endif
2195 if (match_buf_len < sizeof(match_buf) - 1) {
2196 match_buf[match_buf_len] = ic;
2197 match_buf[match_buf_len + 1] = '\0';
2198 }
2199 break;
2200 } /* switch (ic) */
2201
2202 /* Search in history for match_buf */
2203 h = state->cur_history;
2204 if (ic == CTRL('R'))
2205 h--;
2206 while (h >= 0) {
2207 if (state->history[h]) {
2208 char *match = strstr(state->history[h], match_buf);
2209 if (match) {
2210 state->cur_history = h;
2211 matched_history_line = state->history[h];
2212 command_len = load_string(matched_history_line);
2213 cursor = match - matched_history_line;
2214//FIXME: cursor position for Unicode case
2215
2216 free((char*)cmdedit_prompt);
2217 set_prompt:
2218 cmdedit_prompt = xasprintf("(reverse-i-search)'%s': ", match_buf);
2219 cmdedit_prmt_len = unicode_strwidth(cmdedit_prompt);
2220 goto do_redraw;
2221 }
2222 }
2223 h--;
2224 }
2225
2226 /* Not found */
2227 match_buf[match_buf_len] = '\0';
2228 beep();
2229 continue;
2230
2231 do_redraw:
2232 redraw(cmdedit_y, command_len - cursor);
2233 } /* while (1) */
2234
2235 ret:
2236 if (matched_history_line)
2237 command_len = load_string(matched_history_line);
2238
2239 free((char*)cmdedit_prompt);
2240 cmdedit_prompt = saved_prompt;
2241 cmdedit_prmt_len = saved_prmt_len;
2242 redraw(cmdedit_y, command_len - cursor);
2243
2244 return ic;
2245}
2246#endif
2247
2248/* maxsize must be >= 2.
2249 * Returns:
2250 * -1 on read errors or EOF, or on bare Ctrl-D,
2251 * 0 on ctrl-C (the line entered is still returned in 'command'),
2252 * >0 length of input string, including terminating '\n'
2253 */
2254int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize, int timeout)
2255{
2256 int len;
2257#if ENABLE_FEATURE_TAB_COMPLETION
2258 smallint lastWasTab = 0;
2259#endif
2260 smallint break_out = 0;
2261#if ENABLE_FEATURE_EDITING_VI
2262 smallint vi_cmdmode = 0;
2263#endif
2264 struct termios initial_settings;
2265 struct termios new_settings;
2266 char read_key_buffer[KEYCODE_BUFFER_SIZE];
2267
2268 INIT_S();
2269
2270 if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
2271 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON
2272 ) {
2273 /* Happens when e.g. stty -echo was run before.
2274 * But if ICANON is not set, we don't come here.
2275 * (example: interactive python ^Z-backgrounded,
2276 * tty is still in "raw mode").
2277 */
2278 parse_and_put_prompt(prompt);
2279 /* fflush_all(); - done by parse_and_put_prompt */
2280 if (fgets(command, maxsize, stdin) == NULL)
2281 len = -1; /* EOF or error */
2282 else
2283 len = strlen(command);
2284 DEINIT_S();
2285 return len;
2286 }
2287
2288 init_unicode();
2289
2290// FIXME: audit & improve this
2291 if (maxsize > MAX_LINELEN)
2292 maxsize = MAX_LINELEN;
2293 S.maxsize = maxsize;
2294
2295 /* With zero flags, no other fields are ever used */
2296 state = st ? st : (line_input_t*) &const_int_0;
2297#if MAX_HISTORY > 0
2298# if ENABLE_FEATURE_EDITING_SAVEHISTORY
2299 if (state->hist_file)
2300 if (state->cnt_history == 0)
2301 load_history(state);
2302# endif
2303 if (state->flags & DO_HISTORY)
2304 state->cur_history = state->cnt_history;
2305#endif
2306
2307 /* prepare before init handlers */
2308 cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
2309 command_len = 0;
2310#if ENABLE_UNICODE_SUPPORT
2311 command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
2312#else
2313 command_ps = command;
2314 command[0] = '\0';
2315#endif
2316#define command command_must_not_be_used
2317
2318 new_settings = initial_settings;
2319 /* ~ICANON: unbuffered input (most c_cc[] are disabled, VMIN/VTIME are enabled) */
2320 /* ~ECHO, ~ECHONL: turn off echoing, including newline echoing */
2321 /* ~ISIG: turn off INTR (ctrl-C), QUIT, SUSP */
2322 new_settings.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG);
2323 /* reads would block only if < 1 char is available */
2324 new_settings.c_cc[VMIN] = 1;
2325 /* no timeout (reads block forever) */
2326 new_settings.c_cc[VTIME] = 0;
2327 /* Should be not needed if ISIG is off: */
2328 /* Turn off CTRL-C */
2329 /* new_settings.c_cc[VINTR] = _POSIX_VDISABLE; */
2330 tcsetattr_stdin_TCSANOW(&new_settings);
2331
2332#if ENABLE_USERNAME_OR_HOMEDIR
2333 {
2334 struct passwd *entry;
2335
2336 entry = getpwuid(geteuid());
2337 if (entry) {
2338 user_buf = xstrdup(entry->pw_name);
2339 home_pwd_buf = xstrdup(entry->pw_dir);
2340 }
2341 }
2342#endif
2343
2344#if 0
2345 for (i = 0; i <= state->max_history; i++)
2346 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
2347 bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
2348#endif
2349
2350 /* Print out the command prompt, optionally ask where cursor is */
2351 parse_and_put_prompt(prompt);
2352 ask_terminal();
2353
2354 /* Install window resize handler (NB: after *all* init is complete) */
2355//FIXME: save entire sigaction!
2356 previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
2357 win_changed(0); /* get initial window size */
2358
2359 read_key_buffer[0] = 0;
2360 while (1) {
2361 /*
2362 * The emacs and vi modes share much of the code in the big
2363 * command loop. Commands entered when in vi's command mode
2364 * (aka "escape mode") get an extra bit added to distinguish
2365 * them - this keeps them from being self-inserted. This
2366 * clutters the big switch a bit, but keeps all the code
2367 * in one place.
2368 */
2369 int32_t ic, ic_raw;
2370
2371 fflush_all();
2372 ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
2373
2374#if ENABLE_FEATURE_REVERSE_SEARCH
2375 again:
2376#endif
2377#if ENABLE_FEATURE_EDITING_VI
2378 newdelflag = 1;
2379 if (vi_cmdmode) {
2380 /* btw, since KEYCODE_xxx are all < 0, this doesn't
2381 * change ic if it contains one of them: */
2382 ic |= VI_CMDMODE_BIT;
2383 }
2384#endif
2385
2386 switch (ic) {
2387 case '\n':
2388 case '\r':
2389 vi_case('\n'|VI_CMDMODE_BIT:)
2390 vi_case('\r'|VI_CMDMODE_BIT:)
2391 /* Enter */
2392 goto_new_line();
2393 break_out = 1;
2394 break;
2395 case CTRL('A'):
2396 vi_case('0'|VI_CMDMODE_BIT:)
2397 /* Control-a -- Beginning of line */
2398 input_backward(cursor);
2399 break;
2400 case CTRL('B'):
2401 vi_case('h'|VI_CMDMODE_BIT:)
2402 vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
2403 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
2404 input_backward(1); /* Move back one character */
2405 break;
2406 case CTRL('E'):
2407 vi_case('$'|VI_CMDMODE_BIT:)
2408 /* Control-e -- End of line */
2409 put_till_end_and_adv_cursor();
2410 break;
2411 case CTRL('F'):
2412 vi_case('l'|VI_CMDMODE_BIT:)
2413 vi_case(' '|VI_CMDMODE_BIT:)
2414 input_forward(); /* Move forward one character */
2415 break;
2416 case '\b': /* ^H */
2417 case '\x7f': /* DEL */
2418 if (!isrtl_str())
2419 input_backspace();
2420 else
2421 input_delete(0);
2422 break;
2423 case KEYCODE_DELETE:
2424 if (!isrtl_str())
2425 input_delete(0);
2426 else
2427 input_backspace();
2428 break;
2429#if ENABLE_FEATURE_TAB_COMPLETION
2430 case '\t':
2431 input_tab(&lastWasTab);
2432 break;
2433#endif
2434 case CTRL('K'):
2435 /* Control-k -- clear to end of line */
2436 command_ps[cursor] = BB_NUL;
2437 command_len = cursor;
2438 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
2439 break;
2440 case CTRL('L'):
2441 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
2442 /* Control-l -- clear screen */
2443 printf(ESC"[H"); /* cursor to top,left */
2444 redraw(0, command_len - cursor);
2445 break;
2446#if MAX_HISTORY > 0
2447 case CTRL('N'):
2448 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
2449 vi_case('j'|VI_CMDMODE_BIT:)
2450 /* Control-n -- Get next command in history */
2451 if (get_next_history())
2452 goto rewrite_line;
2453 break;
2454 case CTRL('P'):
2455 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
2456 vi_case('k'|VI_CMDMODE_BIT:)
2457 /* Control-p -- Get previous command from history */
2458 if (get_previous_history())
2459 goto rewrite_line;
2460 break;
2461#endif
2462 case CTRL('U'):
2463 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
2464 /* Control-U -- Clear line before cursor */
2465 if (cursor) {
2466 command_len -= cursor;
2467 memmove(command_ps, command_ps + cursor,
2468 (command_len + 1) * sizeof(command_ps[0]));
2469 redraw(cmdedit_y, command_len);
2470 }
2471 break;
2472 case CTRL('W'):
2473 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
2474 /* Control-W -- Remove the last word */
2475 while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
2476 input_backspace();
2477 while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
2478 input_backspace();
2479 break;
2480#if ENABLE_FEATURE_REVERSE_SEARCH
2481 case CTRL('R'):
2482 ic = ic_raw = reverse_i_search();
2483 goto again;
2484#endif
2485
2486#if ENABLE_FEATURE_EDITING_VI
2487 case 'i'|VI_CMDMODE_BIT:
2488 vi_cmdmode = 0;
2489 break;
2490 case 'I'|VI_CMDMODE_BIT:
2491 input_backward(cursor);
2492 vi_cmdmode = 0;
2493 break;
2494 case 'a'|VI_CMDMODE_BIT:
2495 input_forward();
2496 vi_cmdmode = 0;
2497 break;
2498 case 'A'|VI_CMDMODE_BIT:
2499 put_till_end_and_adv_cursor();
2500 vi_cmdmode = 0;
2501 break;
2502 case 'x'|VI_CMDMODE_BIT:
2503 input_delete(1);
2504 break;
2505 case 'X'|VI_CMDMODE_BIT:
2506 if (cursor > 0) {
2507 input_backward(1);
2508 input_delete(1);
2509 }
2510 break;
2511 case 'W'|VI_CMDMODE_BIT:
2512 vi_Word_motion(1);
2513 break;
2514 case 'w'|VI_CMDMODE_BIT:
2515 vi_word_motion(1);
2516 break;
2517 case 'E'|VI_CMDMODE_BIT:
2518 vi_End_motion();
2519 break;
2520 case 'e'|VI_CMDMODE_BIT:
2521 vi_end_motion();
2522 break;
2523 case 'B'|VI_CMDMODE_BIT:
2524 vi_Back_motion();
2525 break;
2526 case 'b'|VI_CMDMODE_BIT:
2527 vi_back_motion();
2528 break;
2529 case 'C'|VI_CMDMODE_BIT:
2530 vi_cmdmode = 0;
2531 /* fall through */
2532 case 'D'|VI_CMDMODE_BIT:
2533 goto clear_to_eol;
2534
2535 case 'c'|VI_CMDMODE_BIT:
2536 vi_cmdmode = 0;
2537 /* fall through */
2538 case 'd'|VI_CMDMODE_BIT: {
2539 int nc, sc;
2540
2541 ic = lineedit_read_key(read_key_buffer, timeout);
2542 if (errno) /* error */
2543 goto return_error_indicator;
2544 if (ic == ic_raw) { /* "cc", "dd" */
2545 input_backward(cursor);
2546 goto clear_to_eol;
2547 break;
2548 }
2549
2550 sc = cursor;
2551 switch (ic) {
2552 case 'w':
2553 case 'W':
2554 case 'e':
2555 case 'E':
2556 switch (ic) {
2557 case 'w': /* "dw", "cw" */
2558 vi_word_motion(vi_cmdmode);
2559 break;
2560 case 'W': /* 'dW', 'cW' */
2561 vi_Word_motion(vi_cmdmode);
2562 break;
2563 case 'e': /* 'de', 'ce' */
2564 vi_end_motion();
2565 input_forward();
2566 break;
2567 case 'E': /* 'dE', 'cE' */
2568 vi_End_motion();
2569 input_forward();
2570 break;
2571 }
2572 nc = cursor;
2573 input_backward(cursor - sc);
2574 while (nc-- > cursor)
2575 input_delete(1);
2576 break;
2577 case 'b': /* "db", "cb" */
2578 case 'B': /* implemented as B */
2579 if (ic == 'b')
2580 vi_back_motion();
2581 else
2582 vi_Back_motion();
2583 while (sc-- > cursor)
2584 input_delete(1);
2585 break;
2586 case ' ': /* "d ", "c " */
2587 input_delete(1);
2588 break;
2589 case '$': /* "d$", "c$" */
2590 clear_to_eol:
2591 while (cursor < command_len)
2592 input_delete(1);
2593 break;
2594 }
2595 break;
2596 }
2597 case 'p'|VI_CMDMODE_BIT:
2598 input_forward();
2599 /* fallthrough */
2600 case 'P'|VI_CMDMODE_BIT:
2601 put();
2602 break;
2603 case 'r'|VI_CMDMODE_BIT:
2604//FIXME: unicode case?
2605 ic = lineedit_read_key(read_key_buffer, timeout);
2606 if (errno) /* error */
2607 goto return_error_indicator;
2608 if (ic < ' ' || ic > 255) {
2609 beep();
2610 } else {
2611 command_ps[cursor] = ic;
2612 bb_putchar(ic);
2613 bb_putchar('\b');
2614 }
2615 break;
2616 case '\x1b': /* ESC */
2617 if (state->flags & VI_MODE) {
2618 /* insert mode --> command mode */
2619 vi_cmdmode = 1;
2620 input_backward(1);
2621 }
2622 /* Handle a few ESC-<key> combinations the same way
2623 * standard readline bindings (IOW: bash) do.
2624 * Often, Alt-<key> generates ESC-<key>.
2625 */
2626 ic = lineedit_read_key(read_key_buffer, 50);
2627 switch (ic) {
2628 //case KEYCODE_LEFT: - bash doesn't do this
2629 case 'b':
2630 ctrl_left();
2631 break;
2632 //case KEYCODE_RIGHT: - bash doesn't do this
2633 case 'f':
2634 ctrl_right();
2635 break;
2636 //case KEYCODE_DELETE: - bash doesn't do this
2637 case 'd': /* Alt-D */
2638 {
2639 /* Delete word forward */
2640 int nc, sc = cursor;
2641 ctrl_right();
2642 nc = cursor - sc;
2643 input_backward(nc);
2644 while (--nc >= 0)
2645 input_delete(1);
2646 break;
2647 }
2648 case '\b': /* Alt-Backspace(?) */
2649 case '\x7f': /* Alt-Backspace(?) */
2650 //case 'w': - bash doesn't do this
2651 {
2652 /* Delete word backward */
2653 int sc = cursor;
2654 ctrl_left();
2655 while (sc-- > cursor)
2656 input_delete(1);
2657 break;
2658 }
2659 }
2660 break;
2661#endif /* FEATURE_COMMAND_EDITING_VI */
2662
2663#if MAX_HISTORY > 0
2664 case KEYCODE_UP:
2665 if (get_previous_history())
2666 goto rewrite_line;
2667 beep();
2668 break;
2669 case KEYCODE_DOWN:
2670 if (!get_next_history())
2671 break;
2672 rewrite_line:
2673 /* Rewrite the line with the selected history item */
2674 /* change command */
2675 command_len = load_string(state->history[state->cur_history] ?
2676 state->history[state->cur_history] : "");
2677 /* redraw and go to eol (bol, in vi) */
2678 redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2679 break;
2680#endif
2681 case KEYCODE_RIGHT:
2682 input_forward();
2683 break;
2684 case KEYCODE_LEFT:
2685 input_backward(1);
2686 break;
2687 case KEYCODE_CTRL_LEFT:
2688 case KEYCODE_ALT_LEFT: /* bash doesn't do it */
2689 ctrl_left();
2690 break;
2691 case KEYCODE_CTRL_RIGHT:
2692 case KEYCODE_ALT_RIGHT: /* bash doesn't do it */
2693 ctrl_right();
2694 break;
2695 case KEYCODE_HOME:
2696 input_backward(cursor);
2697 break;
2698 case KEYCODE_END:
2699 put_till_end_and_adv_cursor();
2700 break;
2701
2702 default:
2703 if (initial_settings.c_cc[VINTR] != 0
2704 && ic_raw == initial_settings.c_cc[VINTR]
2705 ) {
2706 /* Ctrl-C (usually) - stop gathering input */
2707 goto_new_line();
2708 command_len = 0;
2709 break_out = -1; /* "do not append '\n'" */
2710 break;
2711 }
2712 if (initial_settings.c_cc[VEOF] != 0
2713 && ic_raw == initial_settings.c_cc[VEOF]
2714 ) {
2715 /* Ctrl-D (usually) - delete one character,
2716 * or exit if len=0 and no chars to delete */
2717 if (command_len == 0) {
2718 errno = 0;
2719
2720 case -1: /* error (e.g. EIO when tty is destroyed) */
2721 IF_FEATURE_EDITING_VI(return_error_indicator:)
2722 break_out = command_len = -1;
2723 break;
2724 }
2725 input_delete(0);
2726 break;
2727 }
2728// /* Control-V -- force insert of next char */
2729// if (c == CTRL('V')) {
2730// if (safe_read(STDIN_FILENO, &c, 1) < 1)
2731// goto return_error_indicator;
2732// if (c == 0) {
2733// beep();
2734// break;
2735// }
2736// }
2737 if (ic < ' '
2738 || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2739 || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2740 ) {
2741 /* If VI_CMDMODE_BIT is set, ic is >= 256
2742 * and vi mode ignores unexpected chars.
2743 * Otherwise, we are here if ic is a
2744 * control char or an unhandled ESC sequence,
2745 * which is also ignored.
2746 */
2747 break;
2748 }
2749 if ((int)command_len >= (maxsize - 2)) {
2750 /* Not enough space for the char and EOL */
2751 break;
2752 }
2753
2754 command_len++;
2755 if (cursor == (command_len - 1)) {
2756 /* We are at the end, append */
2757 command_ps[cursor] = ic;
2758 command_ps[cursor + 1] = BB_NUL;
2759 put_cur_glyph_and_inc_cursor();
2760 if (unicode_bidi_isrtl(ic))
2761 input_backward(1);
2762 } else {
2763 /* In the middle, insert */
2764 int sc = cursor;
2765
2766 memmove(command_ps + sc + 1, command_ps + sc,
2767 (command_len - sc) * sizeof(command_ps[0]));
2768 command_ps[sc] = ic;
2769 /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
2770 if (!isrtl_str())
2771 sc++; /* no */
2772 put_till_end_and_adv_cursor();
2773 /* to prev x pos + 1 */
2774 input_backward(cursor - sc);
2775 }
2776 break;
2777 } /* switch (ic) */
2778
2779 if (break_out)
2780 break;
2781
2782#if ENABLE_FEATURE_TAB_COMPLETION
2783 if (ic_raw != '\t')
2784 lastWasTab = 0;
2785#endif
2786 } /* while (1) */
2787
2788#if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2789 if (S.sent_ESC_br6n) {
2790 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2791 * We sent "ESC [ 6 n", but got '\n' first, and
2792 * KEYCODE_CURSOR_POS response is now buffered from terminal.
2793 * It's bad already and not much can be done with it
2794 * (it _will_ be visible for the next process to read stdin),
2795 * but without this delay it even shows up on the screen
2796 * as garbage because we restore echo settings with tcsetattr
2797 * before it comes in. UGLY!
2798 */
2799 usleep(20*1000);
2800 }
2801#endif
2802
2803/* End of bug-catching "command_must_not_be_used" trick */
2804#undef command
2805
2806#if ENABLE_UNICODE_SUPPORT
2807 command[0] = '\0';
2808 if (command_len > 0)
2809 command_len = save_string(command, maxsize - 1);
2810 free(command_ps);
2811#endif
2812
2813 if (command_len > 0) {
2814 remember_in_history(command);
2815 }
2816
2817 if (break_out > 0) {
2818 command[command_len++] = '\n';
2819 command[command_len] = '\0';
2820 }
2821
2822#if ENABLE_FEATURE_TAB_COMPLETION
2823 free_tab_completion_data();
2824#endif
2825
2826 /* restore initial_settings */
2827 tcsetattr_stdin_TCSANOW(&initial_settings);
2828 /* restore SIGWINCH handler */
2829 signal(SIGWINCH, previous_SIGWINCH_handler);
2830 fflush_all();
2831
2832 len = command_len;
2833 DEINIT_S();
2834
2835 return len; /* can't return command_len, DEINIT_S() destroys it */
2836}
2837
2838#else /* !FEATURE_EDITING */
2839
2840#undef read_line_input
2841int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2842{
2843 fputs(prompt, stdout);
2844 fflush_all();
2845 if (!fgets(command, maxsize, stdin))
2846 return -1;
2847 return strlen(command);
2848}
2849
2850#endif /* !FEATURE_EDITING */
2851
2852
2853/*
2854 * Testing
2855 */
2856
2857#ifdef TEST
2858
2859#include <locale.h>
2860
2861const char *applet_name = "debug stuff usage";
2862
2863int main(int argc, char **argv)
2864{
2865 char buff[MAX_LINELEN];
2866 char *prompt =
2867#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2868 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2869 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2870 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2871#else
2872 "% ";
2873#endif
2874
2875 while (1) {
2876 int l;
2877 l = read_line_input(prompt, buff);
2878 if (l <= 0 || buff[l-1] != '\n')
2879 break;
2880 buff[l-1] = '\0';
2881 printf("*** read_line_input() returned line =%s=\n", buff);
2882 }
2883 printf("*** read_line_input() detect ^D\n");
2884 return 0;
2885}
2886
2887#endif /* TEST */
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