loadfont,setfont: make them NOEXEC
[oweals/busybox.git] / libbb / lineedit.c
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  * Usage and known bugs:
18  * Terminal key codes are not extensive, more needs to be added.
19  * This version was created on Debian GNU/Linux 2.x.
20  * Delete, Backspace, Home, End, and the arrow keys were tested
21  * to work in an Xterm and console. Ctrl-A also works as Home.
22  * Ctrl-E also works as End.
23  *
24  * The following readline-like commands are not implemented:
25  * CTL-t -- Transpose two characters
26  *
27  * lineedit does not know that the terminal escape sequences do not
28  * take up space on the screen. The redisplay code assumes, unless
29  * told otherwise, that each character in the prompt is a printable
30  * character that takes up one character position on the screen.
31  * You need to tell lineedit that some sequences of characters
32  * in the prompt take up no screen space. Compatibly with readline,
33  * use the \[ escape to begin a sequence of non-printing characters,
34  * and the \] escape to signal the end of such a sequence. Example:
35  *
36  * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
37  *
38  * Unicode in PS1 is not fully supported: prompt length calulation is wrong,
39  * resulting in line wrap problems with long (multi-line) input.
40  *
41  * Multi-line PS1 (e.g. PS1="\n[\w]\n$ ") has problems with history
42  * browsing: up/down arrows result in scrolling.
43  * It stems from simplistic "cmdedit_y = cmdedit_prmt_len / cmdedit_termw"
44  * calculation of how many lines the prompt takes.
45  */
46 #include "busybox.h"
47 #include "NUM_APPLETS.h"
48 #include "unicode.h"
49 #ifndef _POSIX_VDISABLE
50 # define _POSIX_VDISABLE '\0'
51 #endif
52
53
54 #ifdef TEST
55 # define ENABLE_FEATURE_EDITING 0
56 # define ENABLE_FEATURE_TAB_COMPLETION 0
57 # define ENABLE_FEATURE_USERNAME_COMPLETION 0
58 #endif
59
60
61 /* Entire file (except TESTing part) sits inside this #if */
62 #if ENABLE_FEATURE_EDITING
63
64
65 #define ENABLE_USERNAME_OR_HOMEDIR \
66         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
67 #define IF_USERNAME_OR_HOMEDIR(...)
68 #if ENABLE_USERNAME_OR_HOMEDIR
69 # undef IF_USERNAME_OR_HOMEDIR
70 # define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
71 #endif
72
73
74 #undef CHAR_T
75 #if ENABLE_UNICODE_SUPPORT
76 # define BB_NUL ((wchar_t)0)
77 # define CHAR_T wchar_t
78 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
79 # if ENABLE_FEATURE_EDITING_VI
80 static bool BB_isalnum_or_underscore(CHAR_T c) {
81         return ((unsigned)c < 256 && isalnum(c)) || c == '_';
82 }
83 # endif
84 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
85 # undef isspace
86 # undef isalnum
87 # undef ispunct
88 # undef isprint
89 # define isspace isspace_must_not_be_used
90 # define isalnum isalnum_must_not_be_used
91 # define ispunct ispunct_must_not_be_used
92 # define isprint isprint_must_not_be_used
93 #else
94 # define BB_NUL '\0'
95 # define CHAR_T char
96 # define BB_isspace(c) isspace(c)
97 # if ENABLE_FEATURE_EDITING_VI
98 static bool BB_isalnum_or_underscore(CHAR_T c) {
99         return ((unsigned)c < 256 && isalnum(c)) || c == '_';
100 }
101 # endif
102 # define BB_ispunct(c) ispunct(c)
103 #endif
104 #if ENABLE_UNICODE_PRESERVE_BROKEN
105 # define unicode_mark_raw_byte(wc)   ((wc) | 0x20000000)
106 # define unicode_is_raw_byte(wc)     ((wc) & 0x20000000)
107 #else
108 # define unicode_is_raw_byte(wc)     0
109 #endif
110
111
112 #define ESC "\033"
113
114 #define SEQ_CLEAR_TILL_END_OF_SCREEN  ESC"[J"
115 //#define SEQ_CLEAR_TILL_END_OF_LINE  ESC"[K"
116
117
118 enum {
119         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
120                       ? CONFIG_FEATURE_EDITING_MAX_LEN
121                       : 0x7ff0
122 };
123
124 #if ENABLE_USERNAME_OR_HOMEDIR
125 static const char null_str[] ALIGN1 = "";
126 #endif
127
128 /* We try to minimize both static and stack usage. */
129 struct lineedit_statics {
130         line_input_t *state;
131
132         unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
133
134         unsigned cmdedit_x;        /* real x (col) terminal position */
135         unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
136         unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
137
138         unsigned cursor;
139         int command_len; /* must be signed */
140         /* signed maxsize: we want x in "if (x > S.maxsize)"
141          * to _not_ be promoted to unsigned */
142         int maxsize;
143         CHAR_T *command_ps;
144
145         const char *cmdedit_prompt;
146
147 #if ENABLE_USERNAME_OR_HOMEDIR
148         char *user_buf;
149         char *home_pwd_buf; /* = (char*)null_str; */
150 #endif
151
152 #if ENABLE_FEATURE_TAB_COMPLETION
153         char **matches;
154         unsigned num_matches;
155 #endif
156
157         unsigned SIGWINCH_saved;
158         volatile unsigned SIGWINCH_count;
159         volatile smallint ok_to_redraw;
160
161 #if ENABLE_FEATURE_EDITING_VI
162 # define DELBUFSIZ 128
163         smallint newdelflag;     /* whether delbuf should be reused yet */
164         CHAR_T *delptr;
165         CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
166 #endif
167 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
168         smallint sent_ESC_br6n;
169 #endif
170
171         /* Largish struct, keeping it last results in smaller code */
172         struct sigaction SIGWINCH_handler;
173 };
174
175 /* See lineedit_ptr_hack.c */
176 extern struct lineedit_statics *const lineedit_ptr_to_statics;
177
178 #define S (*lineedit_ptr_to_statics)
179 #define state            (S.state           )
180 #define cmdedit_termw    (S.cmdedit_termw   )
181 #define cmdedit_x        (S.cmdedit_x       )
182 #define cmdedit_y        (S.cmdedit_y       )
183 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
184 #define cursor           (S.cursor          )
185 #define command_len      (S.command_len     )
186 #define command_ps       (S.command_ps      )
187 #define cmdedit_prompt   (S.cmdedit_prompt  )
188 #define user_buf         (S.user_buf        )
189 #define home_pwd_buf     (S.home_pwd_buf    )
190 #define matches          (S.matches         )
191 #define num_matches      (S.num_matches     )
192 #define delptr           (S.delptr          )
193 #define newdelflag       (S.newdelflag      )
194 #define delbuf           (S.delbuf          )
195
196 #define INIT_S() do { \
197         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
198         barrier(); \
199         cmdedit_termw = 80; \
200         IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
201         IF_FEATURE_EDITING_VI(delptr = delbuf;) \
202 } while (0)
203
204 static void deinit_S(void)
205 {
206 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
207         /* This one is allocated only if FANCY_PROMPT is on
208          * (otherwise it points to verbatim prompt (NOT malloced)) */
209         free((char*)cmdedit_prompt);
210 #endif
211 #if ENABLE_USERNAME_OR_HOMEDIR
212         free(user_buf);
213         if (home_pwd_buf != null_str)
214                 free(home_pwd_buf);
215 #endif
216         free(lineedit_ptr_to_statics);
217 }
218 #define DEINIT_S() deinit_S()
219
220
221 #if ENABLE_UNICODE_SUPPORT
222 static size_t load_string(const char *src)
223 {
224         if (unicode_status == UNICODE_ON) {
225                 ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1);
226                 if (len < 0)
227                         len = 0;
228                 command_ps[len] = BB_NUL;
229                 return len;
230         } else {
231                 unsigned i = 0;
232                 while (src[i] && i < S.maxsize - 1) {
233                         command_ps[i] = src[i];
234                         i++;
235                 }
236                 command_ps[i] = BB_NUL;
237                 return i;
238         }
239 }
240 static unsigned save_string(char *dst, unsigned maxsize)
241 {
242         if (unicode_status == UNICODE_ON) {
243 # if !ENABLE_UNICODE_PRESERVE_BROKEN
244                 ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
245                 if (len < 0)
246                         len = 0;
247                 dst[len] = '\0';
248                 return len;
249 # else
250                 unsigned dstpos = 0;
251                 unsigned srcpos = 0;
252
253                 maxsize--;
254                 while (dstpos < maxsize) {
255                         wchar_t wc;
256                         int n = srcpos;
257
258                         /* Convert up to 1st invalid byte (or up to end) */
259                         while ((wc = command_ps[srcpos]) != BB_NUL
260                             && !unicode_is_raw_byte(wc)
261                         ) {
262                                 srcpos++;
263                         }
264                         command_ps[srcpos] = BB_NUL;
265                         n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
266                         if (n < 0) /* should not happen */
267                                 break;
268                         dstpos += n;
269                         if (wc == BB_NUL) /* usually is */
270                                 break;
271
272                         /* We do have invalid byte here! */
273                         command_ps[srcpos] = wc; /* restore it */
274                         srcpos++;
275                         if (dstpos == maxsize)
276                                 break;
277                         dst[dstpos++] = (char) wc;
278                 }
279                 dst[dstpos] = '\0';
280                 return dstpos;
281 # endif
282         } else {
283                 unsigned i = 0;
284                 while ((dst[i] = command_ps[i]) != 0)
285                         i++;
286                 return i;
287         }
288 }
289 /* I thought just fputwc(c, stdout) would work. But no... */
290 static void BB_PUTCHAR(wchar_t c)
291 {
292         if (unicode_status == UNICODE_ON) {
293                 char buf[MB_CUR_MAX + 1];
294                 mbstate_t mbst = { 0 };
295                 ssize_t len = wcrtomb(buf, c, &mbst);
296                 if (len > 0) {
297                         buf[len] = '\0';
298                         fputs(buf, stdout);
299                 }
300         } else {
301                 /* In this case, c is always one byte */
302                 putchar(c);
303         }
304 }
305 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
306 static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
307 # else
308 static wchar_t adjust_width_and_validate_wc(wchar_t wc)
309 #  define adjust_width_and_validate_wc(width_adj, wc) \
310         ((*(width_adj))++, adjust_width_and_validate_wc(wc))
311 # endif
312 {
313         int w = 1;
314
315         if (unicode_status == UNICODE_ON) {
316                 if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
317                         /* note: also true for unicode_is_raw_byte(wc) */
318                         goto subst;
319                 }
320                 w = wcwidth(wc);
321                 if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
322                  || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
323                  || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
324                 ) {
325  subst:
326                         w = 1;
327                         wc = CONFIG_SUBST_WCHAR;
328                 }
329         }
330
331 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
332         *width_adj += w;
333 #endif
334         return wc;
335 }
336 #else /* !UNICODE */
337 static size_t load_string(const char *src)
338 {
339         safe_strncpy(command_ps, src, S.maxsize);
340         return strlen(command_ps);
341 }
342 # if ENABLE_FEATURE_TAB_COMPLETION
343 static void save_string(char *dst, unsigned maxsize)
344 {
345         safe_strncpy(dst, command_ps, maxsize);
346 }
347 # endif
348 # define BB_PUTCHAR(c) bb_putchar(c)
349 /* Should never be called: */
350 int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
351 #endif
352
353
354 /* Put 'command_ps[cursor]', cursor++.
355  * Advance cursor on screen. If we reached right margin, scroll text up
356  * and remove terminal margin effect by printing 'next_char' */
357 #define HACK_FOR_WRONG_WIDTH 1
358 static void put_cur_glyph_and_inc_cursor(void)
359 {
360         CHAR_T c = command_ps[cursor];
361         unsigned width = 0;
362         int ofs_to_right;
363
364         if (c == BB_NUL) {
365                 /* erase character after end of input string */
366                 c = ' ';
367         } else {
368                 /* advance cursor only if we aren't at the end yet */
369                 cursor++;
370                 if (unicode_status == UNICODE_ON) {
371                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
372                         c = adjust_width_and_validate_wc(&cmdedit_x, c);
373                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
374                 } else {
375                         cmdedit_x++;
376                 }
377         }
378
379         ofs_to_right = cmdedit_x - cmdedit_termw;
380         if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
381                 /* c fits on this line */
382                 BB_PUTCHAR(c);
383         }
384
385         if (ofs_to_right >= 0) {
386                 /* we go to the next line */
387 #if HACK_FOR_WRONG_WIDTH
388                 /* This works better if our idea of term width is wrong
389                  * and it is actually wider (often happens on serial lines).
390                  * Printing CR,LF *forces* cursor to next line.
391                  * OTOH if terminal width is correct AND terminal does NOT
392                  * have automargin (IOW: it is moving cursor to next line
393                  * by itself (which is wrong for VT-10x terminals)),
394                  * this will break things: there will be one extra empty line */
395                 puts("\r"); /* + implicit '\n' */
396 #else
397                 /* VT-10x terminals don't wrap cursor to next line when last char
398                  * on the line is printed - cursor stays "over" this char.
399                  * Need to print _next_ char too (first one to appear on next line)
400                  * to make cursor move down to next line.
401                  */
402                 /* Works ok only if cmdedit_termw is correct. */
403                 c = command_ps[cursor];
404                 if (c == BB_NUL)
405                         c = ' ';
406                 BB_PUTCHAR(c);
407                 bb_putchar('\b');
408 #endif
409                 cmdedit_y++;
410                 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
411                         width = 0;
412                 } else { /* ofs_to_right > 0 */
413                         /* wide char c didn't fit on prev line */
414                         BB_PUTCHAR(c);
415                 }
416                 cmdedit_x = width;
417         }
418 }
419
420 /* Move to end of line (by printing all chars till the end) */
421 static void put_till_end_and_adv_cursor(void)
422 {
423         while (cursor < command_len)
424                 put_cur_glyph_and_inc_cursor();
425 }
426
427 /* Go to the next line */
428 static void goto_new_line(void)
429 {
430         put_till_end_and_adv_cursor();
431         if (cmdedit_x != 0)
432                 bb_putchar('\n');
433 }
434
435 static void beep(void)
436 {
437         bb_putchar('\007');
438 }
439
440 static void put_prompt(void)
441 {
442         fputs(cmdedit_prompt, stdout);
443         cursor = 0;
444         cmdedit_y = cmdedit_prmt_len / cmdedit_termw; /* new quasireal y */
445         cmdedit_x = cmdedit_prmt_len % cmdedit_termw;
446 }
447
448 /* Move back one character */
449 /* (optimized for slow terminals) */
450 static void input_backward(unsigned num)
451 {
452         if (num > cursor)
453                 num = cursor;
454         if (num == 0)
455                 return;
456         cursor -= num;
457
458         if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
459          && unicode_status == UNICODE_ON
460         ) {
461                 /* correct NUM to be equal to _screen_ width */
462                 int n = num;
463                 num = 0;
464                 while (--n >= 0)
465                         adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
466                 if (num == 0)
467                         return;
468         }
469
470         if (cmdedit_x >= num) {
471                 cmdedit_x -= num;
472                 if (num <= 4) {
473                         /* This is longer by 5 bytes on x86.
474                          * Also gets miscompiled for ARM users
475                          * (busybox.net/bugs/view.php?id=2274).
476                          * printf(("\b\b\b\b" + 4) - num);
477                          * return;
478                          */
479                         do {
480                                 bb_putchar('\b');
481                         } while (--num);
482                         return;
483                 }
484                 printf(ESC"[%uD", num);
485                 return;
486         }
487
488         /* Need to go one or more lines up */
489         if (ENABLE_UNICODE_WIDE_WCHARS) {
490                 /* With wide chars, it is hard to "backtrack"
491                  * and reliably figure out where to put cursor.
492                  * Example (<> is a wide char; # is an ordinary char, _ cursor):
493                  * |prompt: <><> |
494                  * |<><><><><><> |
495                  * |_            |
496                  * and user presses left arrow. num = 1, cmdedit_x = 0,
497                  * We need to go up one line, and then - how do we know that
498                  * we need to go *10* positions to the right? Because
499                  * |prompt: <>#<>|
500                  * |<><><>#<><><>|
501                  * |_            |
502                  * in this situation we need to go *11* positions to the right.
503                  *
504                  * A simpler thing to do is to redraw everything from the start
505                  * up to new cursor position (which is already known):
506                  */
507                 unsigned sv_cursor;
508                 /* go to 1st column; go up to first line */
509                 printf("\r" ESC"[%uA", cmdedit_y);
510                 cmdedit_y = 0;
511                 sv_cursor = cursor;
512                 put_prompt(); /* sets cursor to 0 */
513                 while (cursor < sv_cursor)
514                         put_cur_glyph_and_inc_cursor();
515         } else {
516                 int lines_up;
517                 /* num = chars to go back from the beginning of current line: */
518                 num -= cmdedit_x;
519                 /* num=1...w: one line up, w+1...2w: two, etc: */
520                 lines_up = 1 + (num - 1) / cmdedit_termw;
521                 cmdedit_x = (cmdedit_termw * cmdedit_y - num) % cmdedit_termw;
522                 cmdedit_y -= lines_up;
523                 /* go to 1st column; go up */
524                 printf("\r" ESC"[%uA", lines_up);
525                 /* go to correct column.
526                  * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
527                  * need to *make sure* we skip it if cmdedit_x == 0 */
528                 if (cmdedit_x)
529                         printf(ESC"[%uC", cmdedit_x);
530         }
531 }
532
533 /* draw prompt, editor line, and clear tail */
534 static void redraw(int y, int back_cursor)
535 {
536         if (y > 0) /* up y lines */
537                 printf(ESC"[%uA", y);
538         bb_putchar('\r');
539         put_prompt();
540         put_till_end_and_adv_cursor();
541         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
542         input_backward(back_cursor);
543 }
544
545 /* Delete the char in front of the cursor, optionally saving it
546  * for later putback */
547 #if !ENABLE_FEATURE_EDITING_VI
548 static void input_delete(void)
549 #define input_delete(save) input_delete()
550 #else
551 static void input_delete(int save)
552 #endif
553 {
554         int j = cursor;
555
556         if (j == (int)command_len)
557                 return;
558
559 #if ENABLE_FEATURE_EDITING_VI
560         if (save) {
561                 if (newdelflag) {
562                         delptr = delbuf;
563                         newdelflag = 0;
564                 }
565                 if ((delptr - delbuf) < DELBUFSIZ)
566                         *delptr++ = command_ps[j];
567         }
568 #endif
569
570         memmove(command_ps + j, command_ps + j + 1,
571                         /* (command_len + 1 [because of NUL]) - (j + 1)
572                          * simplified into (command_len - j) */
573                         (command_len - j) * sizeof(command_ps[0]));
574         command_len--;
575         put_till_end_and_adv_cursor();
576         /* Last char is still visible, erase it (and more) */
577         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
578         input_backward(cursor - j);     /* back to old pos cursor */
579 }
580
581 #if ENABLE_FEATURE_EDITING_VI
582 static void put(void)
583 {
584         int ocursor;
585         int j = delptr - delbuf;
586
587         if (j == 0)
588                 return;
589         ocursor = cursor;
590         /* open hole and then fill it */
591         memmove(command_ps + cursor + j, command_ps + cursor,
592                         (command_len - cursor + 1) * sizeof(command_ps[0]));
593         memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
594         command_len += j;
595         put_till_end_and_adv_cursor();
596         input_backward(cursor - ocursor - j + 1); /* at end of new text */
597 }
598 #endif
599
600 /* Delete the char in back of the cursor */
601 static void input_backspace(void)
602 {
603         if (cursor > 0) {
604                 input_backward(1);
605                 input_delete(0);
606         }
607 }
608
609 /* Move forward one character */
610 static void input_forward(void)
611 {
612         if (cursor < command_len)
613                 put_cur_glyph_and_inc_cursor();
614 }
615
616 #if ENABLE_FEATURE_TAB_COMPLETION
617
618 //FIXME:
619 //needs to be more clever: currently it thinks that "foo\ b<TAB>
620 //matches the file named "foo bar", which is untrue.
621 //Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
622 //not "foo bar <cursor>...
623
624 static void free_tab_completion_data(void)
625 {
626         if (matches) {
627                 while (num_matches)
628                         free(matches[--num_matches]);
629                 free(matches);
630                 matches = NULL;
631         }
632 }
633
634 static void add_match(char *matched)
635 {
636         matches = xrealloc_vector(matches, 4, num_matches);
637         matches[num_matches] = matched;
638         num_matches++;
639 }
640
641 # if ENABLE_FEATURE_USERNAME_COMPLETION
642 /* Replace "~user/..." with "/homedir/...".
643  * The parameter is malloced, free it or return it
644  * unchanged if no user is matched.
645  */
646 static char *username_path_completion(char *ud)
647 {
648         struct passwd *entry;
649         char *tilde_name = ud;
650         char *home = NULL;
651
652         ud++; /* skip ~ */
653         if (*ud == '/') {       /* "~/..." */
654                 home = home_pwd_buf;
655         } else {
656                 /* "~user/..." */
657                 ud = strchr(ud, '/');
658                 *ud = '\0';           /* "~user" */
659                 entry = getpwnam(tilde_name + 1);
660                 *ud = '/';            /* restore "~user/..." */
661                 if (entry)
662                         home = entry->pw_dir;
663         }
664         if (home) {
665                 ud = concat_path_file(home, ud);
666                 free(tilde_name);
667                 tilde_name = ud;
668         }
669         return tilde_name;
670 }
671
672 /* ~use<tab> - find all users with this prefix.
673  * Return the length of the prefix used for matching.
674  */
675 static NOINLINE unsigned complete_username(const char *ud)
676 {
677         struct passwd *pw;
678         unsigned userlen;
679
680         ud++; /* skip ~ */
681         userlen = strlen(ud);
682
683         setpwent();
684         while ((pw = getpwent()) != NULL) {
685                 /* Null usernames should result in all users as possible completions. */
686                 if (/* !ud[0] || */ is_prefixed_with(pw->pw_name, ud)) {
687                         add_match(xasprintf("~%s/", pw->pw_name));
688                 }
689         }
690         endpwent(); /* don't keep password file open */
691
692         return 1 + userlen;
693 }
694 # endif  /* FEATURE_USERNAME_COMPLETION */
695
696 enum {
697         FIND_EXE_ONLY = 0,
698         FIND_DIR_ONLY = 1,
699         FIND_FILE_ONLY = 2,
700 };
701
702 static int path_parse(char ***p)
703 {
704         int npth;
705         const char *pth;
706         char *tmp;
707         char **res;
708
709         if (state->flags & WITH_PATH_LOOKUP)
710                 pth = state->path_lookup;
711         else
712                 pth = getenv("PATH");
713
714         /* PATH="" or PATH=":"? */
715         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
716                 return 1;
717
718         tmp = (char*)pth;
719         npth = 1; /* path component count */
720         while (1) {
721                 tmp = strchr(tmp, ':');
722                 if (!tmp)
723                         break;
724                 tmp++;
725                 if (*tmp == '\0')
726                         break;  /* :<empty> */
727                 npth++;
728         }
729
730         *p = res = xmalloc(npth * sizeof(res[0]));
731         res[0] = tmp = xstrdup(pth);
732         npth = 1;
733         while (1) {
734                 tmp = strchr(tmp, ':');
735                 if (!tmp)
736                         break;
737                 *tmp++ = '\0'; /* ':' -> '\0' */
738                 if (*tmp == '\0')
739                         break; /* :<empty> */
740                 res[npth++] = tmp;
741         }
742         return npth;
743 }
744
745 /* Complete command, directory or file name.
746  * Return the length of the prefix used for matching.
747  */
748 static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
749 {
750         char *path1[1];
751         char **paths = path1;
752         int npaths;
753         int i;
754         unsigned pf_len;
755         const char *pfind;
756         char *dirbuf = NULL;
757
758         npaths = 1;
759         path1[0] = (char*)".";
760
761         pfind = strrchr(command, '/');
762         if (!pfind) {
763                 if (type == FIND_EXE_ONLY)
764                         npaths = path_parse(&paths);
765                 pfind = command;
766         } else {
767                 /* point to 'l' in "..../last_component" */
768                 pfind++;
769                 /* dirbuf = ".../.../.../" */
770                 dirbuf = xstrndup(command, pfind - command);
771 # if ENABLE_FEATURE_USERNAME_COMPLETION
772                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
773                         dirbuf = username_path_completion(dirbuf);
774 # endif
775                 path1[0] = dirbuf;
776         }
777         pf_len = strlen(pfind);
778
779 # if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
780         if (type == FIND_EXE_ONLY && !dirbuf) {
781                 const char *p = applet_names;
782
783                 while (*p) {
784                         if (strncmp(pfind, p, pf_len) == 0)
785                                 add_match(xstrdup(p));
786                         while (*p++ != '\0')
787                                 continue;
788                 }
789         }
790 # endif
791
792         for (i = 0; i < npaths; i++) {
793                 DIR *dir;
794                 struct dirent *next;
795                 struct stat st;
796                 char *found;
797
798                 dir = opendir(paths[i]);
799                 if (!dir)
800                         continue; /* don't print an error */
801
802                 while ((next = readdir(dir)) != NULL) {
803                         unsigned len;
804                         const char *name_found = next->d_name;
805
806                         /* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
807                         if (!pfind[0] && DOT_OR_DOTDOT(name_found))
808                                 continue;
809                         /* match? */
810                         if (!is_prefixed_with(name_found, pfind))
811                                 continue; /* no */
812
813                         found = concat_path_file(paths[i], name_found);
814                         /* NB: stat() first so that we see is it a directory;
815                          * but if that fails, use lstat() so that
816                          * we still match dangling links */
817                         if (stat(found, &st) && lstat(found, &st))
818                                 goto cont; /* hmm, remove in progress? */
819
820                         /* Save only name */
821                         len = strlen(name_found);
822                         found = xrealloc(found, len + 2); /* +2: for slash and NUL */
823                         strcpy(found, name_found);
824
825                         if (S_ISDIR(st.st_mode)) {
826                                 /* name is a directory, add slash */
827                                 found[len] = '/';
828                                 found[len + 1] = '\0';
829                         } else {
830                                 /* skip files if looking for dirs only (example: cd) */
831                                 if (type == FIND_DIR_ONLY)
832                                         goto cont;
833                         }
834                         /* add it to the list */
835                         add_match(found);
836                         continue;
837  cont:
838                         free(found);
839                 }
840                 closedir(dir);
841         } /* for every path */
842
843         if (paths != path1) {
844                 free(paths[0]); /* allocated memory is only in first member */
845                 free(paths);
846         }
847         free(dirbuf);
848
849         return pf_len;
850 }
851
852 /* build_match_prefix:
853  * On entry, match_buf contains everything up to cursor at the moment <tab>
854  * was pressed. This function looks at it, figures out what part of it
855  * constitutes the command/file/directory prefix to use for completion,
856  * and rewrites match_buf to contain only that part.
857  */
858 #define dbg_bmp 0
859 /* Helpers: */
860 /* QUOT is used on elements of int_buf[], which are bytes,
861  * not Unicode chars. Therefore it works correctly even in Unicode mode.
862  */
863 #define QUOT (UCHAR_MAX+1)
864 static void remove_chunk(int16_t *int_buf, int beg, int end)
865 {
866         /* beg must be <= end */
867         if (beg == end)
868                 return;
869
870         while ((int_buf[beg] = int_buf[end]) != 0)
871                 beg++, end++;
872
873         if (dbg_bmp) {
874                 int i;
875                 for (i = 0; int_buf[i]; i++)
876                         bb_putchar((unsigned char)int_buf[i]);
877                 bb_putchar('\n');
878         }
879 }
880 /* Caller ensures that match_buf points to a malloced buffer
881  * big enough to hold strlen(match_buf)*2 + 2
882  */
883 static NOINLINE int build_match_prefix(char *match_buf)
884 {
885         int i, j;
886         int command_mode;
887         int16_t *int_buf = (int16_t*)match_buf;
888
889         if (dbg_bmp) printf("\n%s\n", match_buf);
890
891         /* Copy in reverse order, since they overlap */
892         i = strlen(match_buf);
893         do {
894                 int_buf[i] = (unsigned char)match_buf[i];
895                 i--;
896         } while (i >= 0);
897
898         /* Mark every \c as "quoted c" */
899         for (i = 0; int_buf[i]; i++) {
900                 if (int_buf[i] == '\\') {
901                         remove_chunk(int_buf, i, i + 1);
902                         int_buf[i] |= QUOT;
903                 }
904         }
905         /* Quote-mark "chars" and 'chars', drop delimiters */
906         {
907                 int in_quote = 0;
908                 i = 0;
909                 while (int_buf[i]) {
910                         int cur = int_buf[i];
911                         if (!cur)
912                                 break;
913                         if (cur == '\'' || cur == '"') {
914                                 if (!in_quote || (cur == in_quote)) {
915                                         in_quote ^= cur;
916                                         remove_chunk(int_buf, i, i + 1);
917                                         continue;
918                                 }
919                         }
920                         if (in_quote)
921                                 int_buf[i] = cur | QUOT;
922                         i++;
923                 }
924         }
925
926         /* Remove everything up to command delimiters:
927          * ';' ';;' '&' '|' '&&' '||',
928          * but careful with '>&' '<&' '>|'
929          */
930         for (i = 0; int_buf[i]; i++) {
931                 int cur = int_buf[i];
932                 if (cur == ';' || cur == '&' || cur == '|') {
933                         int prev = i ? int_buf[i - 1] : 0;
934                         if (cur == '&' && (prev == '>' || prev == '<')) {
935                                 continue;
936                         } else if (cur == '|' && prev == '>') {
937                                 continue;
938                         }
939                         remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
940                         i = -1;  /* back to square 1 */
941                 }
942         }
943         /* Remove all `cmd` */
944         for (i = 0; int_buf[i]; i++) {
945                 if (int_buf[i] == '`') {
946                         for (j = i + 1; int_buf[j]; j++) {
947                                 if (int_buf[j] == '`') {
948                                         /* `cmd` should count as a word:
949                                          * `cmd` c<tab> should search for files c*,
950                                          * not commands c*. Therefore we don't drop
951                                          * `cmd` entirely, we replace it with single `.
952                                          */
953                                         remove_chunk(int_buf, i, j);
954                                         goto next;
955                                 }
956                         }
957                         /* No closing ` - command mode, remove all up to ` */
958                         remove_chunk(int_buf, 0, i + 1);
959                         break;
960  next: ;
961                 }
962         }
963
964         /* Remove "cmd (" and "cmd {"
965          * Example: "if { c<tab>"
966          * In this example, c should be matched as command pfx.
967          */
968         for (i = 0; int_buf[i]; i++) {
969                 if (int_buf[i] == '(' || int_buf[i] == '{') {
970                         remove_chunk(int_buf, 0, i + 1);
971                         i = -1;  /* back to square 1 */
972                 }
973         }
974
975         /* Remove leading unquoted spaces */
976         for (i = 0; int_buf[i]; i++)
977                 if (int_buf[i] != ' ')
978                         break;
979         remove_chunk(int_buf, 0, i);
980
981         /* Determine completion mode */
982         command_mode = FIND_EXE_ONLY;
983         for (i = 0; int_buf[i]; i++) {
984                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
985                         if (int_buf[i] == ' '
986                          && command_mode == FIND_EXE_ONLY
987                          && (char)int_buf[0] == 'c'
988                          && (char)int_buf[1] == 'd'
989                          && i == 2 /* -> int_buf[2] == ' ' */
990                         ) {
991                                 command_mode = FIND_DIR_ONLY;
992                         } else {
993                                 command_mode = FIND_FILE_ONLY;
994                                 break;
995                         }
996                 }
997         }
998         if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);
999
1000         /* Remove everything except last word */
1001         for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
1002                 continue;
1003         for (--i; i >= 0; i--) {
1004                 int cur = int_buf[i];
1005                 if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
1006                         remove_chunk(int_buf, 0, i + 1);
1007                         break;
1008                 }
1009         }
1010
1011         /* Convert back to string of _chars_ */
1012         i = 0;
1013         while ((match_buf[i] = int_buf[i]) != '\0')
1014                 i++;
1015
1016         if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);
1017
1018         return command_mode;
1019 }
1020
1021 /*
1022  * Display by column (original idea from ls applet,
1023  * very optimized by me [Vladimir] :)
1024  */
1025 static void showfiles(void)
1026 {
1027         int ncols, row;
1028         int column_width = 0;
1029         int nfiles = num_matches;
1030         int nrows = nfiles;
1031         int l;
1032
1033         /* find the longest file name - use that as the column width */
1034         for (row = 0; row < nrows; row++) {
1035                 l = unicode_strwidth(matches[row]);
1036                 if (column_width < l)
1037                         column_width = l;
1038         }
1039         column_width += 2;              /* min space for columns */
1040         ncols = cmdedit_termw / column_width;
1041
1042         if (ncols > 1) {
1043                 nrows /= ncols;
1044                 if (nfiles % ncols)
1045                         nrows++;        /* round up fractionals */
1046         } else {
1047                 ncols = 1;
1048         }
1049         for (row = 0; row < nrows; row++) {
1050                 int n = row;
1051                 int nc;
1052
1053                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
1054                         printf("%s%-*s", matches[n],
1055                                 (int)(column_width - unicode_strwidth(matches[n])), ""
1056                         );
1057                 }
1058                 if (ENABLE_UNICODE_SUPPORT)
1059                         puts(printable_string(NULL, matches[n]));
1060                 else
1061                         puts(matches[n]);
1062         }
1063 }
1064
1065 static const char *is_special_char(char c)
1066 {
1067         return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
1068 }
1069
1070 static char *quote_special_chars(char *found)
1071 {
1072         int l = 0;
1073         char *s = xzalloc((strlen(found) + 1) * 2);
1074
1075         while (*found) {
1076                 if (is_special_char(*found))
1077                         s[l++] = '\\';
1078                 s[l++] = *found++;
1079         }
1080         /* s[l] = '\0'; - already is */
1081         return s;
1082 }
1083
1084 /* Do TAB completion */
1085 static NOINLINE void input_tab(smallint *lastWasTab)
1086 {
1087         char *chosen_match;
1088         char *match_buf;
1089         size_t len_found;
1090         /* Length of string used for matching */
1091         unsigned match_pfx_len = match_pfx_len;
1092         int find_type;
1093 # if ENABLE_UNICODE_SUPPORT
1094         /* cursor pos in command converted to multibyte form */
1095         int cursor_mb;
1096 # endif
1097         if (!(state->flags & TAB_COMPLETION))
1098                 return;
1099
1100         if (*lastWasTab) {
1101                 /* The last char was a TAB too.
1102                  * Print a list of all the available choices.
1103                  */
1104                 if (num_matches > 0) {
1105                         /* cursor will be changed by goto_new_line() */
1106                         int sav_cursor = cursor;
1107                         goto_new_line();
1108                         showfiles();
1109                         redraw(0, command_len - sav_cursor);
1110                 }
1111                 return;
1112         }
1113
1114         *lastWasTab = 1;
1115         chosen_match = NULL;
1116
1117         /* Make a local copy of the string up to the position of the cursor.
1118          * build_match_prefix will expand it into int16_t's, need to allocate
1119          * twice as much as the string_len+1.
1120          * (we then also (ab)use this extra space later - see (**))
1121          */
1122         match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
1123 # if !ENABLE_UNICODE_SUPPORT
1124         save_string(match_buf, cursor + 1); /* +1 for NUL */
1125 # else
1126         {
1127                 CHAR_T wc = command_ps[cursor];
1128                 command_ps[cursor] = BB_NUL;
1129                 save_string(match_buf, MAX_LINELEN);
1130                 command_ps[cursor] = wc;
1131                 cursor_mb = strlen(match_buf);
1132         }
1133 # endif
1134         find_type = build_match_prefix(match_buf);
1135
1136         /* Free up any memory already allocated */
1137         free_tab_completion_data();
1138
1139 # if ENABLE_FEATURE_USERNAME_COMPLETION
1140         /* If the word starts with ~ and there is no slash in the word,
1141          * then try completing this word as a username. */
1142         if (state->flags & USERNAME_COMPLETION)
1143                 if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
1144                         match_pfx_len = complete_username(match_buf);
1145 # endif
1146         /* If complete_username() did not match,
1147          * try to match a command in $PATH, or a directory, or a file */
1148         if (!matches)
1149                 match_pfx_len = complete_cmd_dir_file(match_buf, find_type);
1150
1151         /* Account for backslashes which will be inserted
1152          * by quote_special_chars() later */
1153         {
1154                 const char *e = match_buf + strlen(match_buf);
1155                 const char *s = e - match_pfx_len;
1156                 while (s < e)
1157                         if (is_special_char(*s++))
1158                                 match_pfx_len++;
1159         }
1160
1161         /* Remove duplicates */
1162         if (matches) {
1163                 unsigned i, n = 0;
1164                 qsort_string_vector(matches, num_matches);
1165                 for (i = 0; i < num_matches - 1; ++i) {
1166                         //if (matches[i] && matches[i+1]) { /* paranoia */
1167                                 if (strcmp(matches[i], matches[i+1]) == 0) {
1168                                         free(matches[i]);
1169                                         //matches[i] = NULL; /* paranoia */
1170                                 } else {
1171                                         matches[n++] = matches[i];
1172                                 }
1173                         //}
1174                 }
1175                 matches[n++] = matches[i];
1176                 num_matches = n;
1177         }
1178
1179         /* Did we find exactly one match? */
1180         if (num_matches != 1) { /* no */
1181                 char *cp;
1182                 beep();
1183                 if (!matches)
1184                         goto ret; /* no matches at all */
1185                 /* Find common prefix */
1186                 chosen_match = xstrdup(matches[0]);
1187                 for (cp = chosen_match; *cp; cp++) {
1188                         unsigned n;
1189                         for (n = 1; n < num_matches; n++) {
1190                                 if (matches[n][cp - chosen_match] != *cp) {
1191                                         goto stop;
1192                                 }
1193                         }
1194                 }
1195  stop:
1196                 if (cp == chosen_match) { /* have unique prefix? */
1197                         goto ret; /* no */
1198                 }
1199                 *cp = '\0';
1200                 cp = quote_special_chars(chosen_match);
1201                 free(chosen_match);
1202                 chosen_match = cp;
1203                 len_found = strlen(chosen_match);
1204         } else {                        /* exactly one match */
1205                 /* Next <tab> is not a double-tab */
1206                 *lastWasTab = 0;
1207
1208                 chosen_match = quote_special_chars(matches[0]);
1209                 len_found = strlen(chosen_match);
1210                 if (chosen_match[len_found-1] != '/') {
1211                         chosen_match[len_found] = ' ';
1212                         chosen_match[++len_found] = '\0';
1213                 }
1214         }
1215
1216 # if !ENABLE_UNICODE_SUPPORT
1217         /* Have space to place the match? */
1218         /* The result consists of three parts with these lengths: */
1219         /* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
1220         /* it simplifies into: */
1221         if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
1222                 int pos;
1223                 /* save tail */
1224                 strcpy(match_buf, &command_ps[cursor]);
1225                 /* add match and tail */
1226                 sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
1227                 command_len = strlen(command_ps);
1228                 /* new pos */
1229                 pos = cursor + len_found - match_pfx_len;
1230                 /* write out the matched command */
1231                 redraw(cmdedit_y, command_len - pos);
1232         }
1233 # else
1234         {
1235                 /* Use 2nd half of match_buf as scratch space - see (**) */
1236                 char *command = match_buf + MAX_LINELEN;
1237                 int len = save_string(command, MAX_LINELEN);
1238                 /* Have space to place the match? */
1239                 /* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
1240                 if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
1241                         int pos;
1242                         /* save tail */
1243                         strcpy(match_buf, &command[cursor_mb]);
1244                         /* where do we want to have cursor after all? */
1245                         strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
1246                         len = load_string(command);
1247                         /* add match and tail */
1248                         sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
1249                         command_len = load_string(command);
1250                         /* write out the matched command */
1251                         /* paranoia: load_string can return 0 on conv error,
1252                          * prevent passing pos = (0 - 12) to redraw */
1253                         pos = command_len - len;
1254                         redraw(cmdedit_y, pos >= 0 ? pos : 0);
1255                 }
1256         }
1257 # endif
1258  ret:
1259         free(chosen_match);
1260         free(match_buf);
1261 }
1262
1263 #endif  /* FEATURE_TAB_COMPLETION */
1264
1265
1266 line_input_t* FAST_FUNC new_line_input_t(int flags)
1267 {
1268         line_input_t *n = xzalloc(sizeof(*n));
1269         n->flags = flags;
1270         n->timeout = -1;
1271 #if MAX_HISTORY > 0
1272         n->max_history = MAX_HISTORY;
1273 #endif
1274         return n;
1275 }
1276
1277
1278 #if MAX_HISTORY > 0
1279
1280 unsigned FAST_FUNC size_from_HISTFILESIZE(const char *hp)
1281 {
1282         int size = MAX_HISTORY;
1283         if (hp) {
1284                 size = atoi(hp);
1285                 if (size <= 0)
1286                         return 1;
1287                 if (size > MAX_HISTORY)
1288                         return MAX_HISTORY;
1289         }
1290         return size;
1291 }
1292
1293 static void save_command_ps_at_cur_history(void)
1294 {
1295         if (command_ps[0] != BB_NUL) {
1296                 int cur = state->cur_history;
1297                 free(state->history[cur]);
1298
1299 # if ENABLE_UNICODE_SUPPORT
1300                 {
1301                         char tbuf[MAX_LINELEN];
1302                         save_string(tbuf, sizeof(tbuf));
1303                         state->history[cur] = xstrdup(tbuf);
1304                 }
1305 # else
1306                 state->history[cur] = xstrdup(command_ps);
1307 # endif
1308         }
1309 }
1310
1311 /* state->flags is already checked to be nonzero */
1312 static int get_previous_history(void)
1313 {
1314         if ((state->flags & DO_HISTORY) && state->cur_history) {
1315                 save_command_ps_at_cur_history();
1316                 state->cur_history--;
1317                 return 1;
1318         }
1319         beep();
1320         return 0;
1321 }
1322
1323 static int get_next_history(void)
1324 {
1325         if (state->flags & DO_HISTORY) {
1326                 if (state->cur_history < state->cnt_history) {
1327                         save_command_ps_at_cur_history(); /* save the current history line */
1328                         return ++state->cur_history;
1329                 }
1330         }
1331         beep();
1332         return 0;
1333 }
1334
1335 /* Lists command history. Used by shell 'history' builtins */
1336 void FAST_FUNC show_history(const line_input_t *st)
1337 {
1338         int i;
1339
1340         if (!st)
1341                 return;
1342         for (i = 0; i < st->cnt_history; i++)
1343                 printf("%4d %s\n", i, st->history[i]);
1344 }
1345
1346 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1347 /* We try to ensure that concurrent additions to the history
1348  * do not overwrite each other.
1349  * Otherwise shell users get unhappy.
1350  *
1351  * History file is trimmed lazily, when it grows several times longer
1352  * than configured MAX_HISTORY lines.
1353  */
1354
1355 static void free_line_input_t(line_input_t *n)
1356 {
1357         int i = n->cnt_history;
1358         while (i > 0)
1359                 free(n->history[--i]);
1360         free(n);
1361 }
1362
1363 /* state->flags is already checked to be nonzero */
1364 static void load_history(line_input_t *st_parm)
1365 {
1366         char *temp_h[MAX_HISTORY];
1367         char *line;
1368         FILE *fp;
1369         unsigned idx, i, line_len;
1370
1371         /* NB: do not trash old history if file can't be opened */
1372
1373         fp = fopen_for_read(st_parm->hist_file);
1374         if (fp) {
1375                 /* clean up old history */
1376                 for (idx = st_parm->cnt_history; idx > 0;) {
1377                         idx--;
1378                         free(st_parm->history[idx]);
1379                         st_parm->history[idx] = NULL;
1380                 }
1381
1382                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1383                 memset(temp_h, 0, sizeof(temp_h));
1384                 idx = 0;
1385                 st_parm->cnt_history_in_file = 0;
1386                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1387                         if (line[0] == '\0') {
1388                                 free(line);
1389                                 continue;
1390                         }
1391                         free(temp_h[idx]);
1392                         temp_h[idx] = line;
1393                         st_parm->cnt_history_in_file++;
1394                         idx++;
1395                         if (idx == st_parm->max_history)
1396                                 idx = 0;
1397                 }
1398                 fclose(fp);
1399
1400                 /* find first non-NULL temp_h[], if any */
1401                 if (st_parm->cnt_history_in_file) {
1402                         while (temp_h[idx] == NULL) {
1403                                 idx++;
1404                                 if (idx == st_parm->max_history)
1405                                         idx = 0;
1406                         }
1407                 }
1408
1409                 /* copy temp_h[] to st_parm->history[] */
1410                 for (i = 0; i < st_parm->max_history;) {
1411                         line = temp_h[idx];
1412                         if (!line)
1413                                 break;
1414                         idx++;
1415                         if (idx == st_parm->max_history)
1416                                 idx = 0;
1417                         line_len = strlen(line);
1418                         if (line_len >= MAX_LINELEN)
1419                                 line[MAX_LINELEN-1] = '\0';
1420                         st_parm->history[i++] = line;
1421                 }
1422                 st_parm->cnt_history = i;
1423                 if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT)
1424                         st_parm->cnt_history_in_file = i;
1425         }
1426 }
1427
1428 #  if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1429 void save_history(line_input_t *st)
1430 {
1431         FILE *fp;
1432
1433         if (!st->hist_file)
1434                 return;
1435         if (st->cnt_history <= st->cnt_history_in_file)
1436                 return;
1437
1438         fp = fopen(st->hist_file, "a");
1439         if (fp) {
1440                 int i, fd;
1441                 char *new_name;
1442                 line_input_t *st_temp;
1443
1444                 for (i = st->cnt_history_in_file; i < st->cnt_history; i++)
1445                         fprintf(fp, "%s\n", st->history[i]);
1446                 fclose(fp);
1447
1448                 /* we may have concurrently written entries from others.
1449                  * load them */
1450                 st_temp = new_line_input_t(st->flags);
1451                 st_temp->hist_file = st->hist_file;
1452                 st_temp->max_history = st->max_history;
1453                 load_history(st_temp);
1454
1455                 /* write out temp file and replace hist_file atomically */
1456                 new_name = xasprintf("%s.%u.new", st->hist_file, (int) getpid());
1457                 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1458                 if (fd >= 0) {
1459                         fp = xfdopen_for_write(fd);
1460                         for (i = 0; i < st_temp->cnt_history; i++)
1461                                 fprintf(fp, "%s\n", st_temp->history[i]);
1462                         fclose(fp);
1463                         if (rename(new_name, st->hist_file) == 0)
1464                                 st->cnt_history_in_file = st_temp->cnt_history;
1465                 }
1466                 free(new_name);
1467                 free_line_input_t(st_temp);
1468         }
1469 }
1470 #  else
1471 static void save_history(char *str)
1472 {
1473         int fd;
1474         int len, len2;
1475
1476         if (!state->hist_file)
1477                 return;
1478
1479         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
1480         if (fd < 0)
1481                 return;
1482         xlseek(fd, 0, SEEK_END); /* paranoia */
1483         len = strlen(str);
1484         str[len] = '\n'; /* we (try to) do atomic write */
1485         len2 = full_write(fd, str, len + 1);
1486         str[len] = '\0';
1487         close(fd);
1488         if (len2 != len + 1)
1489                 return; /* "wtf?" */
1490
1491         /* did we write so much that history file needs trimming? */
1492         state->cnt_history_in_file++;
1493         if (state->cnt_history_in_file > state->max_history * 4) {
1494                 char *new_name;
1495                 line_input_t *st_temp;
1496
1497                 /* we may have concurrently written entries from others.
1498                  * load them */
1499                 st_temp = new_line_input_t(state->flags);
1500                 st_temp->hist_file = state->hist_file;
1501                 st_temp->max_history = state->max_history;
1502                 load_history(st_temp);
1503
1504                 /* write out temp file and replace hist_file atomically */
1505                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1506                 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1507                 if (fd >= 0) {
1508                         FILE *fp;
1509                         int i;
1510
1511                         fp = xfdopen_for_write(fd);
1512                         for (i = 0; i < st_temp->cnt_history; i++)
1513                                 fprintf(fp, "%s\n", st_temp->history[i]);
1514                         fclose(fp);
1515                         if (rename(new_name, state->hist_file) == 0)
1516                                 state->cnt_history_in_file = st_temp->cnt_history;
1517                 }
1518                 free(new_name);
1519                 free_line_input_t(st_temp);
1520         }
1521 }
1522 #  endif
1523 # else
1524 #  define load_history(a) ((void)0)
1525 #  define save_history(a) ((void)0)
1526 # endif /* FEATURE_COMMAND_SAVEHISTORY */
1527
1528 static void remember_in_history(char *str)
1529 {
1530         int i;
1531
1532         if (!(state->flags & DO_HISTORY))
1533                 return;
1534         if (str[0] == '\0')
1535                 return;
1536         i = state->cnt_history;
1537         /* Don't save dupes */
1538         if (i && strcmp(state->history[i-1], str) == 0)
1539                 return;
1540
1541         free(state->history[state->max_history]); /* redundant, paranoia */
1542         state->history[state->max_history] = NULL; /* redundant, paranoia */
1543
1544         /* If history[] is full, remove the oldest command */
1545         /* we need to keep history[state->max_history] empty, hence >=, not > */
1546         if (i >= state->max_history) {
1547                 free(state->history[0]);
1548                 for (i = 0; i < state->max_history-1; i++)
1549                         state->history[i] = state->history[i+1];
1550                 /* i == state->max_history-1 */
1551 # if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1552                 if (state->cnt_history_in_file)
1553                         state->cnt_history_in_file--;
1554 # endif
1555         }
1556         /* i <= state->max_history-1 */
1557         state->history[i++] = xstrdup(str);
1558         /* i <= state->max_history */
1559         state->cur_history = i;
1560         state->cnt_history = i;
1561 # if ENABLE_FEATURE_EDITING_SAVEHISTORY && !ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1562         save_history(str);
1563 # endif
1564 }
1565
1566 #else /* MAX_HISTORY == 0 */
1567 # define remember_in_history(a) ((void)0)
1568 #endif /* MAX_HISTORY */
1569
1570
1571 #if ENABLE_FEATURE_EDITING_VI
1572 /*
1573  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1574  */
1575 static void
1576 vi_Word_motion(int eat)
1577 {
1578         CHAR_T *command = command_ps;
1579
1580         while (cursor < command_len && !BB_isspace(command[cursor]))
1581                 input_forward();
1582         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1583                 input_forward();
1584 }
1585
1586 static void
1587 vi_word_motion(int eat)
1588 {
1589         CHAR_T *command = command_ps;
1590
1591         if (BB_isalnum_or_underscore(command[cursor])) {
1592                 while (cursor < command_len
1593                  && (BB_isalnum_or_underscore(command[cursor+1]))
1594                 ) {
1595                         input_forward();
1596                 }
1597         } else if (BB_ispunct(command[cursor])) {
1598                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1599                         input_forward();
1600         }
1601
1602         if (cursor < command_len)
1603                 input_forward();
1604
1605         if (eat) {
1606                 while (cursor < command_len && BB_isspace(command[cursor]))
1607                         input_forward();
1608         }
1609 }
1610
1611 static void
1612 vi_End_motion(void)
1613 {
1614         CHAR_T *command = command_ps;
1615
1616         input_forward();
1617         while (cursor < command_len && BB_isspace(command[cursor]))
1618                 input_forward();
1619         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1620                 input_forward();
1621 }
1622
1623 static void
1624 vi_end_motion(void)
1625 {
1626         CHAR_T *command = command_ps;
1627
1628         if (cursor >= command_len-1)
1629                 return;
1630         input_forward();
1631         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1632                 input_forward();
1633         if (cursor >= command_len-1)
1634                 return;
1635         if (BB_isalnum_or_underscore(command[cursor])) {
1636                 while (cursor < command_len-1
1637                  && (BB_isalnum_or_underscore(command[cursor+1]))
1638                 ) {
1639                         input_forward();
1640                 }
1641         } else if (BB_ispunct(command[cursor])) {
1642                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1643                         input_forward();
1644         }
1645 }
1646
1647 static void
1648 vi_Back_motion(void)
1649 {
1650         CHAR_T *command = command_ps;
1651
1652         while (cursor > 0 && BB_isspace(command[cursor-1]))
1653                 input_backward(1);
1654         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1655                 input_backward(1);
1656 }
1657
1658 static void
1659 vi_back_motion(void)
1660 {
1661         CHAR_T *command = command_ps;
1662
1663         if (cursor <= 0)
1664                 return;
1665         input_backward(1);
1666         while (cursor > 0 && BB_isspace(command[cursor]))
1667                 input_backward(1);
1668         if (cursor <= 0)
1669                 return;
1670         if (BB_isalnum_or_underscore(command[cursor])) {
1671                 while (cursor > 0
1672                  && (BB_isalnum_or_underscore(command[cursor-1]))
1673                 ) {
1674                         input_backward(1);
1675                 }
1676         } else if (BB_ispunct(command[cursor])) {
1677                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1678                         input_backward(1);
1679         }
1680 }
1681 #endif
1682
1683 /* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1684 static void ctrl_left(void)
1685 {
1686         CHAR_T *command = command_ps;
1687
1688         while (1) {
1689                 CHAR_T c;
1690
1691                 input_backward(1);
1692                 if (cursor == 0)
1693                         break;
1694                 c = command[cursor];
1695                 if (c != ' ' && !BB_ispunct(c)) {
1696                         /* we reached a "word" delimited by spaces/punct.
1697                          * go to its beginning */
1698                         while (1) {
1699                                 c = command[cursor - 1];
1700                                 if (c == ' ' || BB_ispunct(c))
1701                                         break;
1702                                 input_backward(1);
1703                                 if (cursor == 0)
1704                                         break;
1705                         }
1706                         break;
1707                 }
1708         }
1709 }
1710 static void ctrl_right(void)
1711 {
1712         CHAR_T *command = command_ps;
1713
1714         while (1) {
1715                 CHAR_T c;
1716
1717                 c = command[cursor];
1718                 if (c == BB_NUL)
1719                         break;
1720                 if (c != ' ' && !BB_ispunct(c)) {
1721                         /* we reached a "word" delimited by spaces/punct.
1722                          * go to its end + 1 */
1723                         while (1) {
1724                                 input_forward();
1725                                 c = command[cursor];
1726                                 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1727                                         break;
1728                         }
1729                         break;
1730                 }
1731                 input_forward();
1732         }
1733 }
1734
1735
1736 /*
1737  * read_line_input and its helpers
1738  */
1739
1740 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1741 static void ask_terminal(void)
1742 {
1743         /* Ask terminal where is the cursor now.
1744          * lineedit_read_key handles response and corrects
1745          * our idea of current cursor position.
1746          * Testcase: run "echo -n long_line_long_line_long_line",
1747          * then type in a long, wrapping command and try to
1748          * delete it using backspace key.
1749          * Note: we print it _after_ prompt, because
1750          * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1751          */
1752         /* Problem: if there is buffered input on stdin,
1753          * the response will be delivered later,
1754          * possibly to an unsuspecting application.
1755          * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1756          * Result:
1757          * ~/srcdevel/bbox/fix/busybox.t4 #
1758          * ~/srcdevel/bbox/fix/busybox.t4 #
1759          * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
1760          * ~/srcdevel/bbox/fix/busybox.t4 #
1761          *
1762          * Checking for input with poll only makes the race narrower,
1763          * I still can trigger it. Strace:
1764          *
1765          * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1766          * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
1767          * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
1768          * poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
1769          * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
1770          */
1771         struct pollfd pfd;
1772
1773         pfd.fd = STDIN_FILENO;
1774         pfd.events = POLLIN;
1775         if (safe_poll(&pfd, 1, 0) == 0) {
1776                 S.sent_ESC_br6n = 1;
1777                 fputs(ESC"[6n", stdout);
1778                 fflush_all(); /* make terminal see it ASAP! */
1779         }
1780 }
1781 #else
1782 #define ask_terminal() ((void)0)
1783 #endif
1784
1785 /* Called just once at read_line_input() init time */
1786 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1787 static void parse_and_put_prompt(const char *prmt_ptr)
1788 {
1789         const char *p;
1790         cmdedit_prompt = prmt_ptr;
1791         p = strrchr(prmt_ptr, '\n');
1792         cmdedit_prmt_len = unicode_strwidth(p ? p+1 : prmt_ptr);
1793         put_prompt();
1794 }
1795 #else
1796 static void parse_and_put_prompt(const char *prmt_ptr)
1797 {
1798         int prmt_size = 0;
1799         char *prmt_mem_ptr = xzalloc(1);
1800 # if ENABLE_USERNAME_OR_HOMEDIR
1801         char *cwd_buf = NULL;
1802 # endif
1803         char flg_not_length = '[';
1804         char cbuf[2];
1805
1806         /*cmdedit_prmt_len = 0; - already is */
1807
1808         cbuf[1] = '\0'; /* never changes */
1809
1810         while (*prmt_ptr) {
1811                 char timebuf[sizeof("HH:MM:SS")];
1812                 char *free_me = NULL;
1813                 char *pbuf;
1814                 char c;
1815
1816                 pbuf = cbuf;
1817                 c = *prmt_ptr++;
1818                 if (c == '\\') {
1819                         const char *cp;
1820                         int l;
1821 /*
1822  * Supported via bb_process_escape_sequence:
1823  * \a   ASCII bell character (07)
1824  * \e   ASCII escape character (033)
1825  * \n   newline
1826  * \r   carriage return
1827  * \\   backslash
1828  * \nnn char with octal code nnn
1829  * Supported:
1830  * \$   if the effective UID is 0, a #, otherwise a $
1831  * \w   current working directory, with $HOME abbreviated with a tilde
1832  *      Note: we do not support $PROMPT_DIRTRIM=n feature
1833  * \W   basename of the current working directory, with $HOME abbreviated with a tilde
1834  * \h   hostname up to the first '.'
1835  * \H   hostname
1836  * \u   username
1837  * \[   begin a sequence of non-printing characters
1838  * \]   end a sequence of non-printing characters
1839  * \T   current time in 12-hour HH:MM:SS format
1840  * \@   current time in 12-hour am/pm format
1841  * \A   current time in 24-hour HH:MM format
1842  * \t   current time in 24-hour HH:MM:SS format
1843  *      (all of the above work as \A)
1844  * Not supported:
1845  * \!   history number of this command
1846  * \#   command number of this command
1847  * \j   number of jobs currently managed by the shell
1848  * \l   basename of the shell's terminal device name
1849  * \s   name of the shell, the basename of $0 (the portion following the final slash)
1850  * \V   release of bash, version + patch level (e.g., 2.00.0)
1851  * \d   date in "Weekday Month Date" format (e.g., "Tue May 26")
1852  * \D{format}
1853  *      format is passed to strftime(3).
1854  *      An empty format results in a locale-specific time representation.
1855  *      The braces are required.
1856  * Mishandled by bb_process_escape_sequence:
1857  * \v   version of bash (e.g., 2.00)
1858  */
1859                         cp = prmt_ptr;
1860                         c = *cp;
1861                         if (c != 't') /* don't treat \t as tab */
1862                                 c = bb_process_escape_sequence(&prmt_ptr);
1863                         if (prmt_ptr == cp) {
1864                                 if (*cp == '\0')
1865                                         break;
1866                                 c = *prmt_ptr++;
1867
1868                                 switch (c) {
1869 # if ENABLE_USERNAME_OR_HOMEDIR
1870                                 case 'u':
1871                                         pbuf = user_buf ? user_buf : (char*)"";
1872                                         break;
1873 # endif
1874                                 case 'H':
1875                                 case 'h':
1876                                         pbuf = free_me = safe_gethostname();
1877                                         if (c == 'h')
1878                                                 strchrnul(pbuf, '.')[0] = '\0';
1879                                         break;
1880                                 case '$':
1881                                         c = (geteuid() == 0 ? '#' : '$');
1882                                         break;
1883                                 case 'T': /* 12-hour HH:MM:SS format */
1884                                 case '@': /* 12-hour am/pm format */
1885                                 case 'A': /* 24-hour HH:MM format */
1886                                 case 't': /* 24-hour HH:MM:SS format */
1887                                         /* We show all of them as 24-hour HH:MM */
1888                                         strftime_HHMMSS(timebuf, sizeof(timebuf), NULL)[-3] = '\0';
1889                                         pbuf = timebuf;
1890                                         break;
1891 # if ENABLE_USERNAME_OR_HOMEDIR
1892                                 case 'w': /* current dir */
1893                                 case 'W': /* basename of cur dir */
1894                                         if (!cwd_buf) {
1895                                                 cwd_buf = xrealloc_getcwd_or_warn(NULL);
1896                                                 if (!cwd_buf)
1897                                                         cwd_buf = (char *)bb_msg_unknown;
1898                                                 else if (home_pwd_buf[0]) {
1899                                                         char *after_home_user;
1900
1901                                                         /* /home/user[/something] -> ~[/something] */
1902                                                         after_home_user = is_prefixed_with(cwd_buf, home_pwd_buf);
1903                                                         if (after_home_user
1904                                                          && (*after_home_user == '/' || *after_home_user == '\0')
1905                                                         ) {
1906                                                                 cwd_buf[0] = '~';
1907                                                                 overlapping_strcpy(cwd_buf + 1, after_home_user);
1908                                                         }
1909                                                 }
1910                                         }
1911                                         pbuf = cwd_buf;
1912                                         if (c == 'w')
1913                                                 break;
1914                                         cp = strrchr(pbuf, '/');
1915                                         if (cp)
1916                                                 pbuf = (char*)cp + 1;
1917                                         break;
1918 # endif
1919 // bb_process_escape_sequence does this now:
1920 //                              case 'e': case 'E':     /* \e \E = \033 */
1921 //                                      c = '\033';
1922 //                                      break;
1923                                 case 'x': case 'X': {
1924                                         char buf2[4];
1925                                         for (l = 0; l < 3;) {
1926                                                 unsigned h;
1927                                                 buf2[l++] = *prmt_ptr;
1928                                                 buf2[l] = '\0';
1929                                                 h = strtoul(buf2, &pbuf, 16);
1930                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1931                                                         buf2[--l] = '\0';
1932                                                         break;
1933                                                 }
1934                                                 prmt_ptr++;
1935                                         }
1936                                         c = (char)strtoul(buf2, NULL, 16);
1937                                         if (c == 0)
1938                                                 c = '?';
1939                                         pbuf = cbuf;
1940                                         break;
1941                                 }
1942                                 case '[': case ']':
1943                                         if (c == flg_not_length) {
1944                                                 /* Toggle '['/']' hex 5b/5d */
1945                                                 flg_not_length ^= 6;
1946                                                 continue;
1947                                         }
1948                                         break;
1949                                 } /* switch */
1950                         } /* if */
1951                 } /* if */
1952                 cbuf[0] = c;
1953                 {
1954                         int n = strlen(pbuf);
1955                         prmt_size += n;
1956                         if (c == '\n')
1957                                 cmdedit_prmt_len = 0;
1958                         else if (flg_not_length != ']') {
1959 #if 0 /*ENABLE_UNICODE_SUPPORT*/
1960 /* Won't work, pbuf is one BYTE string here instead of an one Unicode char string. */
1961 /* FIXME */
1962                                 cmdedit_prmt_len += unicode_strwidth(pbuf);
1963 #else
1964                                 cmdedit_prmt_len += n;
1965 #endif
1966                         }
1967                 }
1968                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_size+1), pbuf);
1969                 free(free_me);
1970         } /* while */
1971
1972 # if ENABLE_USERNAME_OR_HOMEDIR
1973         if (cwd_buf != (char *)bb_msg_unknown)
1974                 free(cwd_buf);
1975 # endif
1976         cmdedit_prompt = prmt_mem_ptr;
1977         put_prompt();
1978 }
1979 #endif
1980
1981 static void cmdedit_setwidth(void)
1982 {
1983         int new_y;
1984
1985         cmdedit_termw = get_terminal_width(STDIN_FILENO);
1986         /* new y for current cursor */
1987         new_y = (cursor + cmdedit_prmt_len) / cmdedit_termw;
1988         /* redraw */
1989         redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1990 }
1991
1992 static void win_changed(int nsig UNUSED_PARAM)
1993 {
1994         if (S.ok_to_redraw) {
1995                 /* We are in read_key(), safe to redraw immediately */
1996                 int sv_errno = errno;
1997                 cmdedit_setwidth();
1998                 fflush_all();
1999                 errno = sv_errno;
2000         } else {
2001                 /* Signal main loop that redraw is necessary */
2002                 S.SIGWINCH_count++;
2003         }
2004 }
2005
2006 static int lineedit_read_key(char *read_key_buffer, int timeout)
2007 {
2008         int64_t ic;
2009 #if ENABLE_UNICODE_SUPPORT
2010         char unicode_buf[MB_CUR_MAX + 1];
2011         int unicode_idx = 0;
2012 #endif
2013
2014         fflush_all();
2015         while (1) {
2016                 /* Wait for input. TIMEOUT = -1 makes read_key wait even
2017                  * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
2018                  * insist on full MB_CUR_MAX buffer to declare input like
2019                  * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
2020                  *
2021                  * Note: read_key sets errno to 0 on success.
2022                  */
2023                 S.ok_to_redraw = 1;
2024                 ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
2025                 S.ok_to_redraw = 0;
2026                 if (errno) {
2027 #if ENABLE_UNICODE_SUPPORT
2028                         if (errno == EAGAIN && unicode_idx != 0)
2029                                 goto pushback;
2030 #endif
2031                         break;
2032                 }
2033
2034 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2035                 if ((int32_t)ic == KEYCODE_CURSOR_POS
2036                  && S.sent_ESC_br6n
2037                 ) {
2038                         S.sent_ESC_br6n = 0;
2039                         if (cursor == 0) { /* otherwise it may be bogus */
2040                                 int col = ((ic >> 32) & 0x7fff) - 1;
2041                                 /*
2042                                  * Is col > cmdedit_prmt_len?
2043                                  * If yes (terminal says cursor is farther to the right
2044                                  * of where we think it should be),
2045                                  * the prompt wasn't printed starting at col 1,
2046                                  * there was additional text before it.
2047                                  */
2048                                 if ((int)(col - cmdedit_prmt_len) > 0) {
2049                                         /* Fix our understanding of current x position */
2050                                         cmdedit_x += (col - cmdedit_prmt_len);
2051                                         while (cmdedit_x >= cmdedit_termw) {
2052                                                 cmdedit_x -= cmdedit_termw;
2053                                                 cmdedit_y++;
2054                                         }
2055                                 }
2056                         }
2057                         continue;
2058                 }
2059 #endif
2060
2061 #if ENABLE_UNICODE_SUPPORT
2062                 if (unicode_status == UNICODE_ON) {
2063                         wchar_t wc;
2064
2065                         if ((int32_t)ic < 0) /* KEYCODE_xxx */
2066                                 break;
2067                         // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
2068
2069                         unicode_buf[unicode_idx++] = ic;
2070                         unicode_buf[unicode_idx] = '\0';
2071                         if (mbstowcs(&wc, unicode_buf, 1) != 1) {
2072                                 /* Not (yet?) a valid unicode char */
2073                                 if (unicode_idx < MB_CUR_MAX) {
2074                                         timeout = 50;
2075                                         continue;
2076                                 }
2077  pushback:
2078                                 /* Invalid sequence. Save all "bad bytes" except first */
2079                                 read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
2080 # if !ENABLE_UNICODE_PRESERVE_BROKEN
2081                                 ic = CONFIG_SUBST_WCHAR;
2082 # else
2083                                 ic = unicode_mark_raw_byte(unicode_buf[0]);
2084 # endif
2085                         } else {
2086                                 /* Valid unicode char, return its code */
2087                                 ic = wc;
2088                         }
2089                 }
2090 #endif
2091                 break;
2092         }
2093
2094         return ic;
2095 }
2096
2097 #if ENABLE_UNICODE_BIDI_SUPPORT
2098 static int isrtl_str(void)
2099 {
2100         int idx = cursor;
2101
2102         while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
2103                 idx++;
2104         return unicode_bidi_isrtl(command_ps[idx]);
2105 }
2106 #else
2107 # define isrtl_str() 0
2108 #endif
2109
2110 /* leave out the "vi-mode"-only case labels if vi editing isn't
2111  * configured. */
2112 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
2113
2114 /* convert uppercase ascii to equivalent control char, for readability */
2115 #undef CTRL
2116 #define CTRL(a) ((a) & ~0x40)
2117
2118 enum {
2119         VI_CMDMODE_BIT = 0x40000000,
2120         /* 0x80000000 bit flags KEYCODE_xxx */
2121 };
2122
2123 #if ENABLE_FEATURE_REVERSE_SEARCH
2124 /* Mimic readline Ctrl-R reverse history search.
2125  * When invoked, it shows the following prompt:
2126  * (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R]
2127  * and typing results in search being performed:
2128  * (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp]
2129  * Search is performed by looking at progressively older lines in history.
2130  * Ctrl-R again searches for the next match in history.
2131  * Backspace deletes last matched char.
2132  * Control keys exit search and return to normal editing (at current history line).
2133  */
2134 static int32_t reverse_i_search(int timeout)
2135 {
2136         char match_buf[128]; /* for user input */
2137         char read_key_buffer[KEYCODE_BUFFER_SIZE];
2138         const char *matched_history_line;
2139         const char *saved_prompt;
2140         unsigned saved_prmt_len;
2141         int32_t ic;
2142
2143         matched_history_line = NULL;
2144         read_key_buffer[0] = 0;
2145         match_buf[0] = '\0';
2146
2147         /* Save and replace the prompt */
2148         saved_prompt = cmdedit_prompt;
2149         saved_prmt_len = cmdedit_prmt_len;
2150         goto set_prompt;
2151
2152         while (1) {
2153                 int h;
2154                 unsigned match_buf_len = strlen(match_buf);
2155
2156 //FIXME: correct timeout? (i.e. count it down?)
2157                 ic = lineedit_read_key(read_key_buffer, timeout);
2158
2159                 switch (ic) {
2160                 case CTRL('R'): /* searching for the next match */
2161                         break;
2162
2163                 case '\b':
2164                 case '\x7f':
2165                         /* Backspace */
2166                         if (unicode_status == UNICODE_ON) {
2167                                 while (match_buf_len != 0) {
2168                                         uint8_t c = match_buf[--match_buf_len];
2169                                         if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */
2170                                                 break; /* yes */
2171                                 }
2172                         } else {
2173                                 if (match_buf_len != 0)
2174                                         match_buf_len--;
2175                         }
2176                         match_buf[match_buf_len] = '\0';
2177                         break;
2178
2179                 default:
2180                         if (ic < ' '
2181                          || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2182                          || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2183                         ) {
2184                                 goto ret;
2185                         }
2186
2187                         /* Append this char */
2188 #if ENABLE_UNICODE_SUPPORT
2189                         if (unicode_status == UNICODE_ON) {
2190                                 mbstate_t mbstate = { 0 };
2191                                 char buf[MB_CUR_MAX + 1];
2192                                 int len = wcrtomb(buf, ic, &mbstate);
2193                                 if (len > 0) {
2194                                         buf[len] = '\0';
2195                                         if (match_buf_len + len < sizeof(match_buf))
2196                                                 strcpy(match_buf + match_buf_len, buf);
2197                                 }
2198                         } else
2199 #endif
2200                         if (match_buf_len < sizeof(match_buf) - 1) {
2201                                 match_buf[match_buf_len] = ic;
2202                                 match_buf[match_buf_len + 1] = '\0';
2203                         }
2204                         break;
2205                 } /* switch (ic) */
2206
2207                 /* Search in history for match_buf */
2208                 h = state->cur_history;
2209                 if (ic == CTRL('R'))
2210                         h--;
2211                 while (h >= 0) {
2212                         if (state->history[h]) {
2213                                 char *match = strstr(state->history[h], match_buf);
2214                                 if (match) {
2215                                         state->cur_history = h;
2216                                         matched_history_line = state->history[h];
2217                                         command_len = load_string(matched_history_line);
2218                                         cursor = match - matched_history_line;
2219 //FIXME: cursor position for Unicode case
2220
2221                                         free((char*)cmdedit_prompt);
2222  set_prompt:
2223                                         cmdedit_prompt = xasprintf("(reverse-i-search)'%s': ", match_buf);
2224                                         cmdedit_prmt_len = unicode_strwidth(cmdedit_prompt);
2225                                         goto do_redraw;
2226                                 }
2227                         }
2228                         h--;
2229                 }
2230
2231                 /* Not found */
2232                 match_buf[match_buf_len] = '\0';
2233                 beep();
2234                 continue;
2235
2236  do_redraw:
2237                 redraw(cmdedit_y, command_len - cursor);
2238         } /* while (1) */
2239
2240  ret:
2241         if (matched_history_line)
2242                 command_len = load_string(matched_history_line);
2243
2244         free((char*)cmdedit_prompt);
2245         cmdedit_prompt = saved_prompt;
2246         cmdedit_prmt_len = saved_prmt_len;
2247         redraw(cmdedit_y, command_len - cursor);
2248
2249         return ic;
2250 }
2251 #endif
2252
2253 /* maxsize must be >= 2.
2254  * Returns:
2255  * -1 on read errors or EOF, or on bare Ctrl-D,
2256  * 0  on ctrl-C (the line entered is still returned in 'command'),
2257  * (in both cases the cursor remains on the input line, '\n' is not printed)
2258  * >0 length of input string, including terminating '\n'
2259  */
2260 int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize)
2261 {
2262         int len;
2263         int timeout;
2264 #if ENABLE_FEATURE_TAB_COMPLETION
2265         smallint lastWasTab = 0;
2266 #endif
2267         smallint break_out = 0;
2268 #if ENABLE_FEATURE_EDITING_VI
2269         smallint vi_cmdmode = 0;
2270 #endif
2271         struct termios initial_settings;
2272         struct termios new_settings;
2273         char read_key_buffer[KEYCODE_BUFFER_SIZE];
2274
2275         INIT_S();
2276
2277         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
2278          || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON
2279         ) {
2280                 /* Happens when e.g. stty -echo was run before.
2281                  * But if ICANON is not set, we don't come here.
2282                  * (example: interactive python ^Z-backgrounded,
2283                  * tty is still in "raw mode").
2284                  */
2285                 parse_and_put_prompt(prompt);
2286                 fflush_all();
2287                 if (fgets(command, maxsize, stdin) == NULL)
2288                         len = -1; /* EOF or error */
2289                 else
2290                         len = strlen(command);
2291                 DEINIT_S();
2292                 return len;
2293         }
2294
2295         init_unicode();
2296
2297 // FIXME: audit & improve this
2298         if (maxsize > MAX_LINELEN)
2299                 maxsize = MAX_LINELEN;
2300         S.maxsize = maxsize;
2301
2302         timeout = -1;
2303         /* Make state->flags == 0 if st is NULL.
2304          * With zeroed flags, no other fields are ever referenced.
2305          */
2306         state = (line_input_t*) &const_int_0;
2307         if (st) {
2308                 state = st;
2309                 timeout = st->timeout;
2310         }
2311 #if MAX_HISTORY > 0
2312 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
2313         if (state->hist_file)
2314                 if (state->cnt_history == 0)
2315                         load_history(state);
2316 # endif
2317         if (state->flags & DO_HISTORY)
2318                 state->cur_history = state->cnt_history;
2319 #endif
2320
2321         /* prepare before init handlers */
2322         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
2323         command_len = 0;
2324 #if ENABLE_UNICODE_SUPPORT
2325         command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
2326 #else
2327         command_ps = command;
2328         command[0] = '\0';
2329 #endif
2330 #define command command_must_not_be_used
2331
2332         new_settings = initial_settings;
2333         /* ~ICANON: unbuffered input (most c_cc[] are disabled, VMIN/VTIME are enabled) */
2334         /* ~ECHO, ~ECHONL: turn off echoing, including newline echoing */
2335         /* ~ISIG: turn off INTR (ctrl-C), QUIT, SUSP */
2336         new_settings.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG);
2337         /* reads will block only if < 1 char is available */
2338         new_settings.c_cc[VMIN] = 1;
2339         /* no timeout (reads block forever) */
2340         new_settings.c_cc[VTIME] = 0;
2341         /* Should be not needed if ISIG is off: */
2342         /* Turn off CTRL-C */
2343         /* new_settings.c_cc[VINTR] = _POSIX_VDISABLE; */
2344         tcsetattr_stdin_TCSANOW(&new_settings);
2345
2346 #if ENABLE_USERNAME_OR_HOMEDIR
2347         {
2348                 struct passwd *entry;
2349
2350                 entry = getpwuid(geteuid());
2351                 if (entry) {
2352                         user_buf = xstrdup(entry->pw_name);
2353                         home_pwd_buf = xstrdup(entry->pw_dir);
2354                 }
2355         }
2356 #endif
2357
2358 #if 0
2359         for (i = 0; i <= state->max_history; i++)
2360                 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
2361         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
2362 #endif
2363
2364         /* Print out the command prompt, optionally ask where cursor is */
2365         parse_and_put_prompt(prompt);
2366         ask_terminal();
2367
2368         /* Install window resize handler (NB: after *all* init is complete) */
2369         S.SIGWINCH_handler.sa_handler = win_changed;
2370         S.SIGWINCH_handler.sa_flags = SA_RESTART;
2371         sigaction(SIGWINCH, &S.SIGWINCH_handler, &S.SIGWINCH_handler);
2372
2373         cmdedit_termw = get_terminal_width(STDIN_FILENO);
2374
2375         read_key_buffer[0] = 0;
2376         while (1) {
2377                 /*
2378                  * The emacs and vi modes share much of the code in the big
2379                  * command loop.  Commands entered when in vi's command mode
2380                  * (aka "escape mode") get an extra bit added to distinguish
2381                  * them - this keeps them from being self-inserted. This
2382                  * clutters the big switch a bit, but keeps all the code
2383                  * in one place.
2384                  */
2385                 int32_t ic, ic_raw;
2386                 unsigned count;
2387
2388                 count = S.SIGWINCH_count;
2389                 if (S.SIGWINCH_saved != count) {
2390                         S.SIGWINCH_saved = count;
2391                         cmdedit_setwidth();
2392                 }
2393
2394                 ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
2395
2396 #if ENABLE_FEATURE_REVERSE_SEARCH
2397  again:
2398 #endif
2399 #if ENABLE_FEATURE_EDITING_VI
2400                 newdelflag = 1;
2401                 if (vi_cmdmode) {
2402                         /* btw, since KEYCODE_xxx are all < 0, this doesn't
2403                          * change ic if it contains one of them: */
2404                         ic |= VI_CMDMODE_BIT;
2405                 }
2406 #endif
2407
2408                 switch (ic) {
2409                 case '\n':
2410                 case '\r':
2411                 vi_case('\n'|VI_CMDMODE_BIT:)
2412                 vi_case('\r'|VI_CMDMODE_BIT:)
2413                         /* Enter */
2414                         goto_new_line();
2415                         break_out = 1;
2416                         break;
2417                 case CTRL('A'):
2418                 vi_case('0'|VI_CMDMODE_BIT:)
2419                         /* Control-a -- Beginning of line */
2420                         input_backward(cursor);
2421                         break;
2422                 case CTRL('B'):
2423                 vi_case('h'|VI_CMDMODE_BIT:)
2424                 vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
2425                 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
2426                         input_backward(1); /* Move back one character */
2427                         break;
2428                 case CTRL('E'):
2429                 vi_case('$'|VI_CMDMODE_BIT:)
2430                         /* Control-e -- End of line */
2431                         put_till_end_and_adv_cursor();
2432                         break;
2433                 case CTRL('F'):
2434                 vi_case('l'|VI_CMDMODE_BIT:)
2435                 vi_case(' '|VI_CMDMODE_BIT:)
2436                         input_forward(); /* Move forward one character */
2437                         break;
2438                 case '\b':   /* ^H */
2439                 case '\x7f': /* DEL */
2440                         if (!isrtl_str())
2441                                 input_backspace();
2442                         else
2443                                 input_delete(0);
2444                         break;
2445                 case KEYCODE_DELETE:
2446                         if (!isrtl_str())
2447                                 input_delete(0);
2448                         else
2449                                 input_backspace();
2450                         break;
2451 #if ENABLE_FEATURE_TAB_COMPLETION
2452                 case '\t':
2453                         input_tab(&lastWasTab);
2454                         break;
2455 #endif
2456                 case CTRL('K'):
2457                         /* Control-k -- clear to end of line */
2458                         command_ps[cursor] = BB_NUL;
2459                         command_len = cursor;
2460                         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
2461                         break;
2462                 case CTRL('L'):
2463                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
2464                         /* Control-l -- clear screen */
2465                         printf(ESC"[H"); /* cursor to top,left */
2466                         redraw(0, command_len - cursor);
2467                         break;
2468 #if MAX_HISTORY > 0
2469                 case CTRL('N'):
2470                 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
2471                 vi_case('j'|VI_CMDMODE_BIT:)
2472                         /* Control-n -- Get next command in history */
2473                         if (get_next_history())
2474                                 goto rewrite_line;
2475                         break;
2476                 case CTRL('P'):
2477                 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
2478                 vi_case('k'|VI_CMDMODE_BIT:)
2479                         /* Control-p -- Get previous command from history */
2480                         if (get_previous_history())
2481                                 goto rewrite_line;
2482                         break;
2483 #endif
2484                 case CTRL('U'):
2485                 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
2486                         /* Control-U -- Clear line before cursor */
2487                         if (cursor) {
2488                                 command_len -= cursor;
2489                                 memmove(command_ps, command_ps + cursor,
2490                                         (command_len + 1) * sizeof(command_ps[0]));
2491                                 redraw(cmdedit_y, command_len);
2492                         }
2493                         break;
2494                 case CTRL('W'):
2495                 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
2496                         /* Control-W -- Remove the last word */
2497                         while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
2498                                 input_backspace();
2499                         while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
2500                                 input_backspace();
2501                         break;
2502                 case KEYCODE_ALT_D: {
2503                         /* Delete word forward */
2504                         int nc, sc = cursor;
2505                         ctrl_right();
2506                         nc = cursor - sc;
2507                         input_backward(nc);
2508                         while (--nc >= 0)
2509                                 input_delete(1);
2510                         break;
2511                 }
2512                 case KEYCODE_ALT_BACKSPACE: {
2513                         /* Delete word backward */
2514                         int sc = cursor;
2515                         ctrl_left();
2516                         while (sc-- > cursor)
2517                                 input_delete(1);
2518                         break;
2519                 }
2520 #if ENABLE_FEATURE_REVERSE_SEARCH
2521                 case CTRL('R'):
2522                         ic = ic_raw = reverse_i_search(timeout);
2523                         goto again;
2524 #endif
2525
2526 #if ENABLE_FEATURE_EDITING_VI
2527                 case 'i'|VI_CMDMODE_BIT:
2528                         vi_cmdmode = 0;
2529                         break;
2530                 case 'I'|VI_CMDMODE_BIT:
2531                         input_backward(cursor);
2532                         vi_cmdmode = 0;
2533                         break;
2534                 case 'a'|VI_CMDMODE_BIT:
2535                         input_forward();
2536                         vi_cmdmode = 0;
2537                         break;
2538                 case 'A'|VI_CMDMODE_BIT:
2539                         put_till_end_and_adv_cursor();
2540                         vi_cmdmode = 0;
2541                         break;
2542                 case 'x'|VI_CMDMODE_BIT:
2543                         input_delete(1);
2544                         break;
2545                 case 'X'|VI_CMDMODE_BIT:
2546                         if (cursor > 0) {
2547                                 input_backward(1);
2548                                 input_delete(1);
2549                         }
2550                         break;
2551                 case 'W'|VI_CMDMODE_BIT:
2552                         vi_Word_motion(1);
2553                         break;
2554                 case 'w'|VI_CMDMODE_BIT:
2555                         vi_word_motion(1);
2556                         break;
2557                 case 'E'|VI_CMDMODE_BIT:
2558                         vi_End_motion();
2559                         break;
2560                 case 'e'|VI_CMDMODE_BIT:
2561                         vi_end_motion();
2562                         break;
2563                 case 'B'|VI_CMDMODE_BIT:
2564                         vi_Back_motion();
2565                         break;
2566                 case 'b'|VI_CMDMODE_BIT:
2567                         vi_back_motion();
2568                         break;
2569                 case 'C'|VI_CMDMODE_BIT:
2570                         vi_cmdmode = 0;
2571                         /* fall through */
2572                 case 'D'|VI_CMDMODE_BIT:
2573                         goto clear_to_eol;
2574
2575                 case 'c'|VI_CMDMODE_BIT:
2576                         vi_cmdmode = 0;
2577                         /* fall through */
2578                 case 'd'|VI_CMDMODE_BIT: {
2579                         int nc, sc;
2580
2581                         ic = lineedit_read_key(read_key_buffer, timeout);
2582                         if (errno) /* error */
2583                                 goto return_error_indicator;
2584                         if (ic == ic_raw) { /* "cc", "dd" */
2585                                 input_backward(cursor);
2586                                 goto clear_to_eol;
2587                                 break;
2588                         }
2589
2590                         sc = cursor;
2591                         switch (ic) {
2592                         case 'w':
2593                         case 'W':
2594                         case 'e':
2595                         case 'E':
2596                                 switch (ic) {
2597                                 case 'w':   /* "dw", "cw" */
2598                                         vi_word_motion(vi_cmdmode);
2599                                         break;
2600                                 case 'W':   /* 'dW', 'cW' */
2601                                         vi_Word_motion(vi_cmdmode);
2602                                         break;
2603                                 case 'e':   /* 'de', 'ce' */
2604                                         vi_end_motion();
2605                                         input_forward();
2606                                         break;
2607                                 case 'E':   /* 'dE', 'cE' */
2608                                         vi_End_motion();
2609                                         input_forward();
2610                                         break;
2611                                 }
2612                                 nc = cursor;
2613                                 input_backward(cursor - sc);
2614                                 while (nc-- > cursor)
2615                                         input_delete(1);
2616                                 break;
2617                         case 'b':  /* "db", "cb" */
2618                         case 'B':  /* implemented as B */
2619                                 if (ic == 'b')
2620                                         vi_back_motion();
2621                                 else
2622                                         vi_Back_motion();
2623                                 while (sc-- > cursor)
2624                                         input_delete(1);
2625                                 break;
2626                         case ' ':  /* "d ", "c " */
2627                                 input_delete(1);
2628                                 break;
2629                         case '$':  /* "d$", "c$" */
2630  clear_to_eol:
2631                                 while (cursor < command_len)
2632                                         input_delete(1);
2633                                 break;
2634                         }
2635                         break;
2636                 }
2637                 case 'p'|VI_CMDMODE_BIT:
2638                         input_forward();
2639                         /* fallthrough */
2640                 case 'P'|VI_CMDMODE_BIT:
2641                         put();
2642                         break;
2643                 case 'r'|VI_CMDMODE_BIT:
2644 //FIXME: unicode case?
2645                         ic = lineedit_read_key(read_key_buffer, timeout);
2646                         if (errno) /* error */
2647                                 goto return_error_indicator;
2648                         if (ic < ' ' || ic > 255) {
2649                                 beep();
2650                         } else {
2651                                 command_ps[cursor] = ic;
2652                                 bb_putchar(ic);
2653                                 bb_putchar('\b');
2654                         }
2655                         break;
2656                 case '\x1b': /* ESC */
2657                         if (state->flags & VI_MODE) {
2658                                 /* insert mode --> command mode */
2659                                 vi_cmdmode = 1;
2660                                 input_backward(1);
2661                         }
2662                         break;
2663 #endif /* FEATURE_COMMAND_EDITING_VI */
2664
2665 #if MAX_HISTORY > 0
2666                 case KEYCODE_UP:
2667                         if (get_previous_history())
2668                                 goto rewrite_line;
2669                         beep();
2670                         break;
2671                 case KEYCODE_DOWN:
2672                         if (!get_next_history())
2673                                 break;
2674  rewrite_line:
2675                         /* Rewrite the line with the selected history item */
2676                         /* change command */
2677                         command_len = load_string(state->history[state->cur_history] ?
2678                                         state->history[state->cur_history] : "");
2679                         /* redraw and go to eol (bol, in vi) */
2680                         redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2681                         break;
2682 #endif
2683                 case KEYCODE_RIGHT:
2684                         input_forward();
2685                         break;
2686                 case KEYCODE_LEFT:
2687                         input_backward(1);
2688                         break;
2689                 case KEYCODE_CTRL_LEFT:
2690                 case KEYCODE_ALT_LEFT: /* bash doesn't do it */
2691                         ctrl_left();
2692                         break;
2693                 case KEYCODE_CTRL_RIGHT:
2694                 case KEYCODE_ALT_RIGHT: /* bash doesn't do it */
2695                         ctrl_right();
2696                         break;
2697                 case KEYCODE_HOME:
2698                         input_backward(cursor);
2699                         break;
2700                 case KEYCODE_END:
2701                         put_till_end_and_adv_cursor();
2702                         break;
2703
2704                 default:
2705                         if (initial_settings.c_cc[VINTR] != 0
2706                          && ic_raw == initial_settings.c_cc[VINTR]
2707                         ) {
2708                                 /* Ctrl-C (usually) - stop gathering input */
2709                                 command_len = 0;
2710                                 break_out = -1; /* "do not append '\n'" */
2711                                 break;
2712                         }
2713                         if (initial_settings.c_cc[VEOF] != 0
2714                          && ic_raw == initial_settings.c_cc[VEOF]
2715                         ) {
2716                                 /* Ctrl-D (usually) - delete one character,
2717                                  * or exit if len=0 and no chars to delete */
2718                                 if (command_len == 0) {
2719                                         errno = 0;
2720
2721                 case -1: /* error (e.g. EIO when tty is destroyed) */
2722  IF_FEATURE_EDITING_VI(return_error_indicator:)
2723                                         break_out = command_len = -1;
2724                                         break;
2725                                 }
2726                                 input_delete(0);
2727                                 break;
2728                         }
2729 //                      /* Control-V -- force insert of next char */
2730 //                      if (c == CTRL('V')) {
2731 //                              if (safe_read(STDIN_FILENO, &c, 1) < 1)
2732 //                                      goto return_error_indicator;
2733 //                              if (c == 0) {
2734 //                                      beep();
2735 //                                      break;
2736 //                              }
2737 //                      }
2738                         if (ic < ' '
2739                          || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2740                          || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2741                         ) {
2742                                 /* If VI_CMDMODE_BIT is set, ic is >= 256
2743                                  * and vi mode ignores unexpected chars.
2744                                  * Otherwise, we are here if ic is a
2745                                  * control char or an unhandled ESC sequence,
2746                                  * which is also ignored.
2747                                  */
2748                                 break;
2749                         }
2750                         if ((int)command_len >= (maxsize - 2)) {
2751                                 /* Not enough space for the char and EOL */
2752                                 break;
2753                         }
2754
2755                         command_len++;
2756                         if (cursor == (command_len - 1)) {
2757                                 /* We are at the end, append */
2758                                 command_ps[cursor] = ic;
2759                                 command_ps[cursor + 1] = BB_NUL;
2760                                 put_cur_glyph_and_inc_cursor();
2761                                 if (unicode_bidi_isrtl(ic))
2762                                         input_backward(1);
2763                         } else {
2764                                 /* In the middle, insert */
2765                                 int sc = cursor;
2766
2767                                 memmove(command_ps + sc + 1, command_ps + sc,
2768                                         (command_len - sc) * sizeof(command_ps[0]));
2769                                 command_ps[sc] = ic;
2770                                 /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
2771                                 if (!isrtl_str())
2772                                         sc++; /* no */
2773                                 put_till_end_and_adv_cursor();
2774                                 /* to prev x pos + 1 */
2775                                 input_backward(cursor - sc);
2776                         }
2777                         break;
2778                 } /* switch (ic) */
2779
2780                 if (break_out)
2781                         break;
2782
2783 #if ENABLE_FEATURE_TAB_COMPLETION
2784                 if (ic_raw != '\t')
2785                         lastWasTab = 0;
2786 #endif
2787         } /* while (1) */
2788
2789 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2790         if (S.sent_ESC_br6n) {
2791                 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2792                  * We sent "ESC [ 6 n", but got '\n' first, and
2793                  * KEYCODE_CURSOR_POS response is now buffered from terminal.
2794                  * It's bad already and not much can be done with it
2795                  * (it _will_ be visible for the next process to read stdin),
2796                  * but without this delay it even shows up on the screen
2797                  * as garbage because we restore echo settings with tcsetattr
2798                  * before it comes in. UGLY!
2799                  */
2800                 usleep(20*1000);
2801         }
2802 #endif
2803
2804 /* End of bug-catching "command_must_not_be_used" trick */
2805 #undef command
2806
2807 #if ENABLE_UNICODE_SUPPORT
2808         command[0] = '\0';
2809         if (command_len > 0)
2810                 command_len = save_string(command, maxsize - 1);
2811         free(command_ps);
2812 #endif
2813
2814         if (command_len > 0) {
2815                 remember_in_history(command);
2816         }
2817
2818         if (break_out > 0) {
2819                 command[command_len++] = '\n';
2820                 command[command_len] = '\0';
2821         }
2822
2823 #if ENABLE_FEATURE_TAB_COMPLETION
2824         free_tab_completion_data();
2825 #endif
2826
2827         /* restore initial_settings */
2828         tcsetattr_stdin_TCSANOW(&initial_settings);
2829         /* restore SIGWINCH handler */
2830         sigaction_set(SIGWINCH, &S.SIGWINCH_handler);
2831         fflush_all();
2832
2833         len = command_len;
2834         DEINIT_S();
2835
2836         return len; /* can't return command_len, DEINIT_S() destroys it */
2837 }
2838
2839 #else  /* !FEATURE_EDITING */
2840
2841 #undef read_line_input
2842 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2843 {
2844         fputs(prompt, stdout);
2845         fflush_all();
2846         if (!fgets(command, maxsize, stdin))
2847                 return -1;
2848         return strlen(command);
2849 }
2850
2851 #endif  /* !FEATURE_EDITING */
2852
2853
2854 /*
2855  * Testing
2856  */
2857
2858 #ifdef TEST
2859
2860 #include <locale.h>
2861
2862 const char *applet_name = "debug stuff usage";
2863
2864 int main(int argc, char **argv)
2865 {
2866         char buff[MAX_LINELEN];
2867         char *prompt =
2868 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2869                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2870                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2871                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2872 #else
2873                 "% ";
2874 #endif
2875
2876         while (1) {
2877                 int l;
2878                 l = read_line_input(prompt, buff);
2879                 if (l <= 0 || buff[l-1] != '\n')
2880                         break;
2881                 buff[l-1] = '\0';
2882                 printf("*** read_line_input() returned line =%s=\n", buff);
2883         }
2884         printf("*** read_line_input() detect ^D\n");
2885         return 0;
2886 }
2887
2888 #endif  /* TEST */