1 /* vi: set sw=4 ts=4: */
3 * Command line editing.
5 * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
6 * Written by: Vladimir Oleynik <dzo@simtreas.ru>
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)
14 * This code is 'as is' with no warranty.
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.
24 * The following readline-like commands are not implemented:
25 * CTL-t -- Transpose two characters
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:
36 * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
38 * Unicode in PS1 is not fully supported: prompt length calulation is wrong,
39 * resulting in line wrap problems with long (multi-line) input.
42 #include "NUM_APPLETS.h"
44 #ifndef _POSIX_VDISABLE
45 # define _POSIX_VDISABLE '\0'
50 # define ENABLE_FEATURE_EDITING 0
51 # define ENABLE_FEATURE_TAB_COMPLETION 0
52 # define ENABLE_FEATURE_USERNAME_COMPLETION 0
56 /* Entire file (except TESTing part) sits inside this #if */
57 #if ENABLE_FEATURE_EDITING
60 #define ENABLE_USERNAME_OR_HOMEDIR \
61 (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
62 #define IF_USERNAME_OR_HOMEDIR(...)
63 #if ENABLE_USERNAME_OR_HOMEDIR
64 # undef IF_USERNAME_OR_HOMEDIR
65 # define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
70 #if ENABLE_UNICODE_SUPPORT
71 # define BB_NUL ((wchar_t)0)
72 # define CHAR_T wchar_t
73 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
74 # if ENABLE_FEATURE_EDITING_VI
75 static bool BB_isalnum_or_underscore(CHAR_T c) {
76 return ((unsigned)c < 256 && isalnum(c)) || c == '_';
79 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
84 # define isspace isspace_must_not_be_used
85 # define isalnum isalnum_must_not_be_used
86 # define ispunct ispunct_must_not_be_used
87 # define isprint isprint_must_not_be_used
91 # define BB_isspace(c) isspace(c)
92 # if ENABLE_FEATURE_EDITING_VI
93 static bool BB_isalnum_or_underscore(CHAR_T c)
95 return ((unsigned)c < 256 && isalnum(c)) || c == '_';
98 # define BB_ispunct(c) ispunct(c)
100 #if ENABLE_UNICODE_PRESERVE_BROKEN
101 # define unicode_mark_raw_byte(wc) ((wc) | 0x20000000)
102 # define unicode_is_raw_byte(wc) ((wc) & 0x20000000)
104 # define unicode_is_raw_byte(wc) 0
110 #define SEQ_CLEAR_TILL_END_OF_SCREEN ESC"[J"
111 //#define SEQ_CLEAR_TILL_END_OF_LINE ESC"[K"
115 MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
116 ? CONFIG_FEATURE_EDITING_MAX_LEN
120 #if ENABLE_USERNAME_OR_HOMEDIR
121 static const char null_str[] ALIGN1 = "";
124 /* We try to minimize both static and stack usage. */
125 struct lineedit_statics {
128 unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
130 unsigned cmdedit_x; /* real x (col) terminal position */
131 unsigned cmdedit_y; /* pseudoreal y (row) terminal position */
132 unsigned cmdedit_prmt_len; /* on-screen length of last/sole prompt line */
135 int command_len; /* must be signed */
136 /* signed maxsize: we want x in "if (x > S.maxsize)"
137 * to _not_ be promoted to unsigned */
141 const char *cmdedit_prompt;
142 const char *prompt_last_line; /* last/sole prompt line */
144 #if ENABLE_USERNAME_OR_HOMEDIR
146 char *home_pwd_buf; /* = (char*)null_str; */
149 #if ENABLE_FEATURE_TAB_COMPLETION
151 unsigned num_matches;
154 #if ENABLE_FEATURE_EDITING_WINCH
155 unsigned SIGWINCH_saved;
156 volatile unsigned SIGWINCH_count;
157 volatile smallint ok_to_redraw;
160 #if ENABLE_FEATURE_EDITING_VI
161 # define DELBUFSIZ 128
162 smallint newdelflag; /* whether delbuf should be reused yet */
164 CHAR_T delbuf[DELBUFSIZ]; /* a place to store deleted characters */
166 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
167 smallint sent_ESC_br6n;
170 #if ENABLE_FEATURE_EDITING_WINCH
171 /* Largish struct, keeping it last results in smaller code */
172 struct sigaction SIGWINCH_handler;
176 /* See lineedit_ptr_hack.c */
177 extern struct lineedit_statics *const lineedit_ptr_to_statics;
179 #define S (*lineedit_ptr_to_statics)
180 #define state (S.state )
181 #define cmdedit_termw (S.cmdedit_termw )
182 #define cmdedit_x (S.cmdedit_x )
183 #define cmdedit_y (S.cmdedit_y )
184 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
185 #define cursor (S.cursor )
186 #define command_len (S.command_len )
187 #define command_ps (S.command_ps )
188 #define cmdedit_prompt (S.cmdedit_prompt )
189 #define prompt_last_line (S.prompt_last_line)
190 #define user_buf (S.user_buf )
191 #define home_pwd_buf (S.home_pwd_buf )
192 #define matches (S.matches )
193 #define num_matches (S.num_matches )
194 #define delptr (S.delptr )
195 #define newdelflag (S.newdelflag )
196 #define delbuf (S.delbuf )
198 #define INIT_S() do { \
199 (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
201 cmdedit_termw = 80; \
202 IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
203 IF_FEATURE_EDITING_VI(delptr = delbuf;) \
206 static void deinit_S(void)
208 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
209 /* This one is allocated only if FANCY_PROMPT is on
210 * (otherwise it points to verbatim prompt (NOT malloced)) */
211 free((char*)cmdedit_prompt);
213 #if ENABLE_USERNAME_OR_HOMEDIR
215 if (home_pwd_buf != null_str)
218 free(lineedit_ptr_to_statics);
220 #define DEINIT_S() deinit_S()
223 #if ENABLE_UNICODE_SUPPORT
224 static size_t load_string(const char *src)
226 if (unicode_status == UNICODE_ON) {
227 ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1);
230 command_ps[len] = BB_NUL;
234 while (src[i] && i < S.maxsize - 1) {
235 command_ps[i] = src[i];
238 command_ps[i] = BB_NUL;
242 static unsigned save_string(char *dst, unsigned maxsize)
244 if (unicode_status == UNICODE_ON) {
245 # if !ENABLE_UNICODE_PRESERVE_BROKEN
246 ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
256 while (dstpos < maxsize) {
260 /* Convert up to 1st invalid byte (or up to end) */
261 while ((wc = command_ps[srcpos]) != BB_NUL
262 && !unicode_is_raw_byte(wc)
266 command_ps[srcpos] = BB_NUL;
267 n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
268 if (n < 0) /* should not happen */
271 if (wc == BB_NUL) /* usually is */
274 /* We do have invalid byte here! */
275 command_ps[srcpos] = wc; /* restore it */
277 if (dstpos == maxsize)
279 dst[dstpos++] = (char) wc;
286 while ((dst[i] = command_ps[i]) != 0)
291 /* I thought just fputwc(c, stdout) would work. But no... */
292 static void BB_PUTCHAR(wchar_t c)
294 if (unicode_status == UNICODE_ON) {
295 char buf[MB_CUR_MAX + 1];
296 mbstate_t mbst = { 0 };
297 ssize_t len = wcrtomb(buf, c, &mbst);
303 /* In this case, c is always one byte */
307 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
308 static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
310 static wchar_t adjust_width_and_validate_wc(wchar_t wc)
311 # define adjust_width_and_validate_wc(width_adj, wc) \
312 ((*(width_adj))++, adjust_width_and_validate_wc(wc))
317 if (unicode_status == UNICODE_ON) {
318 if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
319 /* note: also true for unicode_is_raw_byte(wc) */
323 if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
324 || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
325 || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
329 wc = CONFIG_SUBST_WCHAR;
333 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
339 static size_t load_string(const char *src)
341 safe_strncpy(command_ps, src, S.maxsize);
342 return strlen(command_ps);
344 # if ENABLE_FEATURE_TAB_COMPLETION
345 static void save_string(char *dst, unsigned maxsize)
347 safe_strncpy(dst, command_ps, maxsize);
350 # define BB_PUTCHAR(c) bb_putchar(c)
351 /* Should never be called: */
352 int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
356 /* Put 'command_ps[cursor]', cursor++.
357 * Advance cursor on screen. If we reached right margin, scroll text up
358 * and remove terminal margin effect by printing 'next_char' */
359 #define HACK_FOR_WRONG_WIDTH 1
360 static void put_cur_glyph_and_inc_cursor(void)
362 CHAR_T c = command_ps[cursor];
367 /* erase character after end of input string */
370 /* advance cursor only if we aren't at the end yet */
372 if (unicode_status == UNICODE_ON) {
373 IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
374 c = adjust_width_and_validate_wc(&cmdedit_x, c);
375 IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
381 ofs_to_right = cmdedit_x - cmdedit_termw;
382 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
383 /* c fits on this line */
387 if (ofs_to_right >= 0) {
388 /* we go to the next line */
389 #if HACK_FOR_WRONG_WIDTH
390 /* This works better if our idea of term width is wrong
391 * and it is actually wider (often happens on serial lines).
392 * Printing CR,LF *forces* cursor to next line.
393 * OTOH if terminal width is correct AND terminal does NOT
394 * have automargin (IOW: it is moving cursor to next line
395 * by itself (which is wrong for VT-10x terminals)),
396 * this will break things: there will be one extra empty line */
397 puts("\r"); /* + implicit '\n' */
399 /* VT-10x terminals don't wrap cursor to next line when last char
400 * on the line is printed - cursor stays "over" this char.
401 * Need to print _next_ char too (first one to appear on next line)
402 * to make cursor move down to next line.
404 /* Works ok only if cmdedit_termw is correct. */
405 c = command_ps[cursor];
412 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
414 } else { /* ofs_to_right > 0 */
415 /* wide char c didn't fit on prev line */
422 /* Move to end of line (by printing all chars till the end) */
423 static void put_till_end_and_adv_cursor(void)
425 while (cursor < command_len)
426 put_cur_glyph_and_inc_cursor();
429 /* Go to the next line */
430 static void goto_new_line(void)
432 put_till_end_and_adv_cursor();
433 /* "cursor == 0" is only if prompt is "" and user input is empty */
434 if (cursor == 0 || cmdedit_x != 0)
438 static void beep(void)
443 /* Full or last/sole prompt line, reset edit cursor, calculate terminal cursor.
444 * cmdedit_y is always calculated for the last/sole prompt line.
446 static void put_prompt_custom(bool is_full)
448 fputs((is_full ? cmdedit_prompt : prompt_last_line), stdout);
450 cmdedit_y = cmdedit_prmt_len / cmdedit_termw; /* new quasireal y */
451 cmdedit_x = cmdedit_prmt_len % cmdedit_termw;
454 #define put_prompt_last_line() put_prompt_custom(0)
455 #define put_prompt() put_prompt_custom(1)
457 /* Move back one character */
458 /* (optimized for slow terminals) */
459 static void input_backward(unsigned num)
467 if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
468 && unicode_status == UNICODE_ON
470 /* correct NUM to be equal to _screen_ width */
474 adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
479 if (cmdedit_x >= num) {
482 /* This is longer by 5 bytes on x86.
483 * Also gets miscompiled for ARM users
484 * (busybox.net/bugs/view.php?id=2274).
485 * printf(("\b\b\b\b" + 4) - num);
493 printf(ESC"[%uD", num);
497 /* Need to go one or more lines up */
498 if (ENABLE_UNICODE_WIDE_WCHARS) {
499 /* With wide chars, it is hard to "backtrack"
500 * and reliably figure out where to put cursor.
501 * Example (<> is a wide char; # is an ordinary char, _ cursor):
505 * and user presses left arrow. num = 1, cmdedit_x = 0,
506 * We need to go up one line, and then - how do we know that
507 * we need to go *10* positions to the right? Because
511 * in this situation we need to go *11* positions to the right.
513 * A simpler thing to do is to redraw everything from the start
514 * up to new cursor position (which is already known):
517 /* go to 1st column; go up to first line */
518 printf("\r" ESC"[%uA", cmdedit_y);
521 put_prompt_last_line(); /* sets cursor to 0 */
522 while (cursor < sv_cursor)
523 put_cur_glyph_and_inc_cursor();
526 /* num = chars to go back from the beginning of current line: */
528 /* num=1...w: one line up, w+1...2w: two, etc: */
529 lines_up = 1 + (num - 1) / cmdedit_termw;
530 cmdedit_x = (cmdedit_termw * cmdedit_y - num) % cmdedit_termw;
531 cmdedit_y -= lines_up;
532 /* go to 1st column; go up */
533 printf("\r" ESC"[%uA", lines_up);
534 /* go to correct column.
535 * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
536 * need to *make sure* we skip it if cmdedit_x == 0 */
538 printf(ESC"[%uC", cmdedit_x);
542 /* See redraw and draw_full below */
543 static void draw_custom(int y, int back_cursor, bool is_full)
545 if (y > 0) /* up y lines */
546 printf(ESC"[%uA", y);
548 put_prompt_custom(is_full);
549 put_till_end_and_adv_cursor();
550 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
551 input_backward(back_cursor);
554 /* Move y lines up, draw last/sole prompt line, editor line[s], and clear tail.
555 * goal: redraw the prompt+input+cursor in-place, overwriting the previous */
556 #define redraw(y, back_cursor) draw_custom((y), (back_cursor), 0)
558 /* Like above, but without moving up, and while using all the prompt lines.
559 * goal: draw a full prompt+input+cursor unrelated to a previous position.
560 * note: cmdedit_y always ends up relating to the last/sole prompt line */
561 #define draw_full(back_cursor) draw_custom(0, (back_cursor), 1)
563 /* Delete the char in front of the cursor, optionally saving it
564 * for later putback */
565 #if !ENABLE_FEATURE_EDITING_VI
566 static void input_delete(void)
567 #define input_delete(save) input_delete()
569 static void input_delete(int save)
574 if (j == (int)command_len)
577 #if ENABLE_FEATURE_EDITING_VI
583 if ((delptr - delbuf) < DELBUFSIZ)
584 *delptr++ = command_ps[j];
588 memmove(command_ps + j, command_ps + j + 1,
589 /* (command_len + 1 [because of NUL]) - (j + 1)
590 * simplified into (command_len - j) */
591 (command_len - j) * sizeof(command_ps[0]));
593 put_till_end_and_adv_cursor();
594 /* Last char is still visible, erase it (and more) */
595 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
596 input_backward(cursor - j); /* back to old pos cursor */
599 #if ENABLE_FEATURE_EDITING_VI
600 static void put(void)
603 int j = delptr - delbuf;
608 /* open hole and then fill it */
609 memmove(command_ps + cursor + j, command_ps + cursor,
610 (command_len - cursor + 1) * sizeof(command_ps[0]));
611 memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
613 put_till_end_and_adv_cursor();
614 input_backward(cursor - ocursor - j + 1); /* at end of new text */
618 /* Delete the char in back of the cursor */
619 static void input_backspace(void)
627 /* Move forward one character */
628 static void input_forward(void)
630 if (cursor < command_len)
631 put_cur_glyph_and_inc_cursor();
634 #if ENABLE_FEATURE_TAB_COMPLETION
637 //needs to be more clever: currently it thinks that "foo\ b<TAB>
638 //matches the file named "foo bar", which is untrue.
639 //Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
640 //not "foo bar <cursor>...
642 static void free_tab_completion_data(void)
646 free(matches[--num_matches]);
652 static void add_match(char *matched)
654 unsigned char *p = (unsigned char*)matched;
656 /* ESC attack fix: drop any string with control chars */
658 || (!ENABLE_UNICODE_SUPPORT && *p >= 0x7f)
659 || (ENABLE_UNICODE_SUPPORT && *p == 0x7f)
666 matches = xrealloc_vector(matches, 4, num_matches);
667 matches[num_matches] = matched;
671 # if ENABLE_FEATURE_USERNAME_COMPLETION
672 /* Replace "~user/..." with "/homedir/...".
673 * The parameter is malloced, free it or return it
674 * unchanged if no user is matched.
676 static char *username_path_completion(char *ud)
678 struct passwd *entry;
679 char *tilde_name = ud;
683 if (*ud == '/') { /* "~/..." */
687 ud = strchr(ud, '/');
688 *ud = '\0'; /* "~user" */
689 entry = getpwnam(tilde_name + 1);
690 *ud = '/'; /* restore "~user/..." */
692 home = entry->pw_dir;
695 ud = concat_path_file(home, ud);
702 /* ~use<tab> - find all users with this prefix.
703 * Return the length of the prefix used for matching.
705 static NOINLINE unsigned complete_username(const char *ud)
711 userlen = strlen(ud);
714 while ((pw = getpwent()) != NULL) {
715 /* Null usernames should result in all users as possible completions. */
716 if (/* !ud[0] || */ is_prefixed_with(pw->pw_name, ud)) {
717 add_match(xasprintf("~%s/", pw->pw_name));
720 endpwent(); /* don't keep password file open */
724 # endif /* FEATURE_USERNAME_COMPLETION */
732 static int path_parse(char ***p)
739 if (state->flags & WITH_PATH_LOOKUP)
740 pth = state->path_lookup;
742 pth = getenv("PATH");
744 /* PATH="" or PATH=":"? */
745 if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
749 npth = 1; /* path component count */
751 tmp = strchr(tmp, ':');
756 break; /* :<empty> */
760 *p = res = xmalloc(npth * sizeof(res[0]));
761 res[0] = tmp = xstrdup(pth);
764 tmp = strchr(tmp, ':');
767 *tmp++ = '\0'; /* ':' -> '\0' */
769 break; /* :<empty> */
775 /* Complete command, directory or file name.
776 * Return the length of the prefix used for matching.
778 static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
781 char **paths = path1;
789 path1[0] = (char*)".";
791 pfind = strrchr(command, '/');
793 if (type == FIND_EXE_ONLY)
794 npaths = path_parse(&paths);
797 /* point to 'l' in "..../last_component" */
799 /* dirbuf = ".../.../.../" */
800 dirbuf = xstrndup(command, pfind - command);
801 # if ENABLE_FEATURE_USERNAME_COMPLETION
802 if (dirbuf[0] == '~') /* ~/... or ~user/... */
803 dirbuf = username_path_completion(dirbuf);
807 pf_len = strlen(pfind);
809 # if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
810 if (type == FIND_EXE_ONLY && !dirbuf) {
811 const char *p = applet_names;
814 if (strncmp(pfind, p, pf_len) == 0)
815 add_match(xstrdup(p));
822 for (i = 0; i < npaths; i++) {
828 dir = opendir(paths[i]);
830 continue; /* don't print an error */
832 while ((next = readdir(dir)) != NULL) {
834 const char *name_found = next->d_name;
836 /* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
837 if (!pfind[0] && DOT_OR_DOTDOT(name_found))
840 if (!is_prefixed_with(name_found, pfind))
843 found = concat_path_file(paths[i], name_found);
844 /* NB: stat() first so that we see is it a directory;
845 * but if that fails, use lstat() so that
846 * we still match dangling links */
847 if (stat(found, &st) && lstat(found, &st))
848 goto cont; /* hmm, remove in progress? */
851 len = strlen(name_found);
852 found = xrealloc(found, len + 2); /* +2: for slash and NUL */
853 strcpy(found, name_found);
855 if (S_ISDIR(st.st_mode)) {
856 /* name is a directory, add slash */
858 found[len + 1] = '\0';
860 /* skip files if looking for dirs only (example: cd) */
861 if (type == FIND_DIR_ONLY)
864 /* add it to the list */
871 } /* for every path */
873 if (paths != path1) {
874 free(paths[0]); /* allocated memory is only in first member */
882 /* build_match_prefix:
883 * On entry, match_buf contains everything up to cursor at the moment <tab>
884 * was pressed. This function looks at it, figures out what part of it
885 * constitutes the command/file/directory prefix to use for completion,
886 * and rewrites match_buf to contain only that part.
890 /* QUOT is used on elements of int_buf[], which are bytes,
891 * not Unicode chars. Therefore it works correctly even in Unicode mode.
893 #define QUOT (UCHAR_MAX+1)
894 static void remove_chunk(int16_t *int_buf, int beg, int end)
896 /* beg must be <= end */
900 while ((int_buf[beg] = int_buf[end]) != 0)
905 for (i = 0; int_buf[i]; i++)
906 bb_putchar((unsigned char)int_buf[i]);
910 /* Caller ensures that match_buf points to a malloced buffer
911 * big enough to hold strlen(match_buf)*2 + 2
913 static NOINLINE int build_match_prefix(char *match_buf)
917 int16_t *int_buf = (int16_t*)match_buf;
919 if (dbg_bmp) printf("\n%s\n", match_buf);
921 /* Copy in reverse order, since they overlap */
922 i = strlen(match_buf);
924 int_buf[i] = (unsigned char)match_buf[i];
928 /* Mark every \c as "quoted c" */
929 for (i = 0; int_buf[i]; i++) {
930 if (int_buf[i] == '\\') {
931 remove_chunk(int_buf, i, i + 1);
935 /* Quote-mark "chars" and 'chars', drop delimiters */
940 int cur = int_buf[i];
943 if (cur == '\'' || cur == '"') {
944 if (!in_quote || (cur == in_quote)) {
946 remove_chunk(int_buf, i, i + 1);
951 int_buf[i] = cur | QUOT;
956 /* Remove everything up to command delimiters:
957 * ';' ';;' '&' '|' '&&' '||',
958 * but careful with '>&' '<&' '>|'
960 for (i = 0; int_buf[i]; i++) {
961 int cur = int_buf[i];
962 if (cur == ';' || cur == '&' || cur == '|') {
963 int prev = i ? int_buf[i - 1] : 0;
964 if (cur == '&' && (prev == '>' || prev == '<')) {
966 } else if (cur == '|' && prev == '>') {
969 remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
970 i = -1; /* back to square 1 */
973 /* Remove all `cmd` */
974 for (i = 0; int_buf[i]; i++) {
975 if (int_buf[i] == '`') {
976 for (j = i + 1; int_buf[j]; j++) {
977 if (int_buf[j] == '`') {
978 /* `cmd` should count as a word:
979 * `cmd` c<tab> should search for files c*,
980 * not commands c*. Therefore we don't drop
981 * `cmd` entirely, we replace it with single `.
983 remove_chunk(int_buf, i, j);
987 /* No closing ` - command mode, remove all up to ` */
988 remove_chunk(int_buf, 0, i + 1);
994 /* Remove "cmd (" and "cmd {"
995 * Example: "if { c<tab>"
996 * In this example, c should be matched as command pfx.
998 for (i = 0; int_buf[i]; i++) {
999 if (int_buf[i] == '(' || int_buf[i] == '{') {
1000 remove_chunk(int_buf, 0, i + 1);
1001 i = -1; /* back to square 1 */
1005 /* Remove leading unquoted spaces */
1006 for (i = 0; int_buf[i]; i++)
1007 if (int_buf[i] != ' ')
1009 remove_chunk(int_buf, 0, i);
1011 /* Determine completion mode */
1012 command_mode = FIND_EXE_ONLY;
1013 for (i = 0; int_buf[i]; i++) {
1014 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
1015 if (int_buf[i] == ' '
1016 && command_mode == FIND_EXE_ONLY
1017 && (char)int_buf[0] == 'c'
1018 && (char)int_buf[1] == 'd'
1019 && i == 2 /* -> int_buf[2] == ' ' */
1021 command_mode = FIND_DIR_ONLY;
1023 command_mode = FIND_FILE_ONLY;
1028 if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);
1030 /* Remove everything except last word */
1031 for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
1033 for (--i; i >= 0; i--) {
1034 int cur = int_buf[i];
1035 if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
1036 remove_chunk(int_buf, 0, i + 1);
1041 /* Convert back to string of _chars_ */
1043 while ((match_buf[i] = int_buf[i]) != '\0')
1046 if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);
1048 return command_mode;
1052 * Display by column (original idea from ls applet,
1053 * very optimized by me [Vladimir] :)
1055 static void showfiles(void)
1058 int column_width = 0;
1059 int nfiles = num_matches;
1063 /* find the longest file name - use that as the column width */
1064 for (row = 0; row < nrows; row++) {
1065 l = unicode_strwidth(matches[row]);
1066 if (column_width < l)
1069 column_width += 2; /* min space for columns */
1070 ncols = cmdedit_termw / column_width;
1075 nrows++; /* round up fractionals */
1079 for (row = 0; row < nrows; row++) {
1083 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
1084 printf("%s%-*s", matches[n],
1085 (int)(column_width - unicode_strwidth(matches[n])), ""
1088 if (ENABLE_UNICODE_SUPPORT)
1089 puts(printable_string(NULL, matches[n]));
1095 static const char *is_special_char(char c)
1097 return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
1100 static char *quote_special_chars(char *found)
1103 char *s = xzalloc((strlen(found) + 1) * 2);
1106 if (is_special_char(*found))
1110 /* s[l] = '\0'; - already is */
1114 /* Do TAB completion */
1115 static NOINLINE void input_tab(smallint *lastWasTab)
1120 /* Length of string used for matching */
1121 unsigned match_pfx_len = match_pfx_len;
1123 # if ENABLE_UNICODE_SUPPORT
1124 /* cursor pos in command converted to multibyte form */
1127 if (!(state->flags & TAB_COMPLETION))
1131 /* The last char was a TAB too.
1132 * Print a list of all the available choices.
1134 if (num_matches > 0) {
1135 /* cursor will be changed by goto_new_line() */
1136 int sav_cursor = cursor;
1139 draw_full(command_len - sav_cursor);
1145 chosen_match = NULL;
1147 /* Make a local copy of the string up to the position of the cursor.
1148 * build_match_prefix will expand it into int16_t's, need to allocate
1149 * twice as much as the string_len+1.
1150 * (we then also (ab)use this extra space later - see (**))
1152 match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
1153 # if !ENABLE_UNICODE_SUPPORT
1154 save_string(match_buf, cursor + 1); /* +1 for NUL */
1157 CHAR_T wc = command_ps[cursor];
1158 command_ps[cursor] = BB_NUL;
1159 save_string(match_buf, MAX_LINELEN);
1160 command_ps[cursor] = wc;
1161 cursor_mb = strlen(match_buf);
1164 find_type = build_match_prefix(match_buf);
1166 /* Free up any memory already allocated */
1167 free_tab_completion_data();
1169 # if ENABLE_FEATURE_USERNAME_COMPLETION
1170 /* If the word starts with ~ and there is no slash in the word,
1171 * then try completing this word as a username. */
1172 if (state->flags & USERNAME_COMPLETION)
1173 if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
1174 match_pfx_len = complete_username(match_buf);
1176 /* If complete_username() did not match,
1177 * try to match a command in $PATH, or a directory, or a file */
1179 match_pfx_len = complete_cmd_dir_file(match_buf, find_type);
1181 /* Account for backslashes which will be inserted
1182 * by quote_special_chars() later */
1184 const char *e = match_buf + strlen(match_buf);
1185 const char *s = e - match_pfx_len;
1187 if (is_special_char(*s++))
1191 /* Remove duplicates */
1194 qsort_string_vector(matches, num_matches);
1195 for (i = 0; i < num_matches - 1; ++i) {
1196 //if (matches[i] && matches[i+1]) { /* paranoia */
1197 if (strcmp(matches[i], matches[i+1]) == 0) {
1199 //matches[i] = NULL; /* paranoia */
1201 matches[n++] = matches[i];
1205 matches[n++] = matches[i];
1209 /* Did we find exactly one match? */
1210 if (num_matches != 1) { /* no */
1214 goto ret; /* no matches at all */
1215 /* Find common prefix */
1216 chosen_match = xstrdup(matches[0]);
1217 for (cp = chosen_match; *cp; cp++) {
1219 for (n = 1; n < num_matches; n++) {
1220 if (matches[n][cp - chosen_match] != *cp) {
1226 if (cp == chosen_match) { /* have unique prefix? */
1230 cp = quote_special_chars(chosen_match);
1233 len_found = strlen(chosen_match);
1234 } else { /* exactly one match */
1235 /* Next <tab> is not a double-tab */
1238 chosen_match = quote_special_chars(matches[0]);
1239 len_found = strlen(chosen_match);
1240 if (chosen_match[len_found-1] != '/') {
1241 chosen_match[len_found] = ' ';
1242 chosen_match[++len_found] = '\0';
1246 # if !ENABLE_UNICODE_SUPPORT
1247 /* Have space to place the match? */
1248 /* The result consists of three parts with these lengths: */
1249 /* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
1250 /* it simplifies into: */
1251 if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
1254 strcpy(match_buf, &command_ps[cursor]);
1255 /* add match and tail */
1256 sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
1257 command_len = strlen(command_ps);
1259 pos = cursor + len_found - match_pfx_len;
1260 /* write out the matched command */
1261 redraw(cmdedit_y, command_len - pos);
1265 /* Use 2nd half of match_buf as scratch space - see (**) */
1266 char *command = match_buf + MAX_LINELEN;
1267 int len = save_string(command, MAX_LINELEN);
1268 /* Have space to place the match? */
1269 /* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
1270 if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
1273 strcpy(match_buf, &command[cursor_mb]);
1274 /* where do we want to have cursor after all? */
1275 strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
1276 len = load_string(command);
1277 /* add match and tail */
1278 sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
1279 command_len = load_string(command);
1280 /* write out the matched command */
1281 /* paranoia: load_string can return 0 on conv error,
1282 * prevent passing pos = (0 - 12) to redraw */
1283 pos = command_len - len;
1284 redraw(cmdedit_y, pos >= 0 ? pos : 0);
1293 #endif /* FEATURE_TAB_COMPLETION */
1296 line_input_t* FAST_FUNC new_line_input_t(int flags)
1298 line_input_t *n = xzalloc(sizeof(*n));
1302 n->max_history = MAX_HISTORY;
1310 unsigned FAST_FUNC size_from_HISTFILESIZE(const char *hp)
1312 int size = MAX_HISTORY;
1317 if (size > MAX_HISTORY)
1323 static void save_command_ps_at_cur_history(void)
1325 if (command_ps[0] != BB_NUL) {
1326 int cur = state->cur_history;
1327 free(state->history[cur]);
1329 # if ENABLE_UNICODE_SUPPORT
1331 char tbuf[MAX_LINELEN];
1332 save_string(tbuf, sizeof(tbuf));
1333 state->history[cur] = xstrdup(tbuf);
1336 state->history[cur] = xstrdup(command_ps);
1341 /* state->flags is already checked to be nonzero */
1342 static int get_previous_history(void)
1344 if ((state->flags & DO_HISTORY) && state->cur_history) {
1345 save_command_ps_at_cur_history();
1346 state->cur_history--;
1353 static int get_next_history(void)
1355 if (state->flags & DO_HISTORY) {
1356 if (state->cur_history < state->cnt_history) {
1357 save_command_ps_at_cur_history(); /* save the current history line */
1358 return ++state->cur_history;
1365 /* Lists command history. Used by shell 'history' builtins */
1366 void FAST_FUNC show_history(const line_input_t *st)
1372 for (i = 0; i < st->cnt_history; i++)
1373 printf("%4d %s\n", i, st->history[i]);
1376 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1377 /* We try to ensure that concurrent additions to the history
1378 * do not overwrite each other.
1379 * Otherwise shell users get unhappy.
1381 * History file is trimmed lazily, when it grows several times longer
1382 * than configured MAX_HISTORY lines.
1385 static void free_line_input_t(line_input_t *n)
1387 int i = n->cnt_history;
1389 free(n->history[--i]);
1393 /* state->flags is already checked to be nonzero */
1394 static void load_history(line_input_t *st_parm)
1396 char *temp_h[MAX_HISTORY];
1399 unsigned idx, i, line_len;
1401 /* NB: do not trash old history if file can't be opened */
1403 fp = fopen_for_read(st_parm->hist_file);
1405 /* clean up old history */
1406 for (idx = st_parm->cnt_history; idx > 0;) {
1408 free(st_parm->history[idx]);
1409 st_parm->history[idx] = NULL;
1412 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1413 memset(temp_h, 0, sizeof(temp_h));
1415 st_parm->cnt_history_in_file = 0;
1416 while ((line = xmalloc_fgetline(fp)) != NULL) {
1417 if (line[0] == '\0') {
1423 st_parm->cnt_history_in_file++;
1425 if (idx == st_parm->max_history)
1430 /* find first non-NULL temp_h[], if any */
1431 if (st_parm->cnt_history_in_file) {
1432 while (temp_h[idx] == NULL) {
1434 if (idx == st_parm->max_history)
1439 /* copy temp_h[] to st_parm->history[] */
1440 for (i = 0; i < st_parm->max_history;) {
1445 if (idx == st_parm->max_history)
1447 line_len = strlen(line);
1448 if (line_len >= MAX_LINELEN)
1449 line[MAX_LINELEN-1] = '\0';
1450 st_parm->history[i++] = line;
1452 st_parm->cnt_history = i;
1453 if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT)
1454 st_parm->cnt_history_in_file = i;
1458 # if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1459 void save_history(line_input_t *st)
1465 if (st->cnt_history <= st->cnt_history_in_file)
1468 fp = fopen(st->hist_file, "a");
1472 line_input_t *st_temp;
1474 for (i = st->cnt_history_in_file; i < st->cnt_history; i++)
1475 fprintf(fp, "%s\n", st->history[i]);
1478 /* we may have concurrently written entries from others.
1480 st_temp = new_line_input_t(st->flags);
1481 st_temp->hist_file = st->hist_file;
1482 st_temp->max_history = st->max_history;
1483 load_history(st_temp);
1485 /* write out temp file and replace hist_file atomically */
1486 new_name = xasprintf("%s.%u.new", st->hist_file, (int) getpid());
1487 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1489 fp = xfdopen_for_write(fd);
1490 for (i = 0; i < st_temp->cnt_history; i++)
1491 fprintf(fp, "%s\n", st_temp->history[i]);
1493 if (rename(new_name, st->hist_file) == 0)
1494 st->cnt_history_in_file = st_temp->cnt_history;
1497 free_line_input_t(st_temp);
1501 static void save_history(char *str)
1506 if (!state->hist_file)
1509 fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
1512 xlseek(fd, 0, SEEK_END); /* paranoia */
1514 str[len] = '\n'; /* we (try to) do atomic write */
1515 len2 = full_write(fd, str, len + 1);
1518 if (len2 != len + 1)
1519 return; /* "wtf?" */
1521 /* did we write so much that history file needs trimming? */
1522 state->cnt_history_in_file++;
1523 if (state->cnt_history_in_file > state->max_history * 4) {
1525 line_input_t *st_temp;
1527 /* we may have concurrently written entries from others.
1529 st_temp = new_line_input_t(state->flags);
1530 st_temp->hist_file = state->hist_file;
1531 st_temp->max_history = state->max_history;
1532 load_history(st_temp);
1534 /* write out temp file and replace hist_file atomically */
1535 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1536 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1541 fp = xfdopen_for_write(fd);
1542 for (i = 0; i < st_temp->cnt_history; i++)
1543 fprintf(fp, "%s\n", st_temp->history[i]);
1545 if (rename(new_name, state->hist_file) == 0)
1546 state->cnt_history_in_file = st_temp->cnt_history;
1549 free_line_input_t(st_temp);
1554 # define load_history(a) ((void)0)
1555 # define save_history(a) ((void)0)
1556 # endif /* FEATURE_COMMAND_SAVEHISTORY */
1558 static void remember_in_history(char *str)
1562 if (!(state->flags & DO_HISTORY))
1566 i = state->cnt_history;
1567 /* Don't save dupes */
1568 if (i && strcmp(state->history[i-1], str) == 0)
1571 free(state->history[state->max_history]); /* redundant, paranoia */
1572 state->history[state->max_history] = NULL; /* redundant, paranoia */
1574 /* If history[] is full, remove the oldest command */
1575 /* we need to keep history[state->max_history] empty, hence >=, not > */
1576 if (i >= state->max_history) {
1577 free(state->history[0]);
1578 for (i = 0; i < state->max_history-1; i++)
1579 state->history[i] = state->history[i+1];
1580 /* i == state->max_history-1 */
1581 # if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1582 if (state->cnt_history_in_file)
1583 state->cnt_history_in_file--;
1586 /* i <= state->max_history-1 */
1587 state->history[i++] = xstrdup(str);
1588 /* i <= state->max_history */
1589 state->cur_history = i;
1590 state->cnt_history = i;
1591 # if ENABLE_FEATURE_EDITING_SAVEHISTORY && !ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1596 #else /* MAX_HISTORY == 0 */
1597 # define remember_in_history(a) ((void)0)
1598 #endif /* MAX_HISTORY */
1601 #if ENABLE_FEATURE_EDITING_VI
1603 * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1606 vi_Word_motion(int eat)
1608 CHAR_T *command = command_ps;
1610 while (cursor < command_len && !BB_isspace(command[cursor]))
1612 if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1617 vi_word_motion(int eat)
1619 CHAR_T *command = command_ps;
1621 if (BB_isalnum_or_underscore(command[cursor])) {
1622 while (cursor < command_len
1623 && (BB_isalnum_or_underscore(command[cursor+1]))
1627 } else if (BB_ispunct(command[cursor])) {
1628 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1632 if (cursor < command_len)
1636 while (cursor < command_len && BB_isspace(command[cursor]))
1644 CHAR_T *command = command_ps;
1647 while (cursor < command_len && BB_isspace(command[cursor]))
1649 while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1656 CHAR_T *command = command_ps;
1658 if (cursor >= command_len-1)
1661 while (cursor < command_len-1 && BB_isspace(command[cursor]))
1663 if (cursor >= command_len-1)
1665 if (BB_isalnum_or_underscore(command[cursor])) {
1666 while (cursor < command_len-1
1667 && (BB_isalnum_or_underscore(command[cursor+1]))
1671 } else if (BB_ispunct(command[cursor])) {
1672 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1678 vi_Back_motion(void)
1680 CHAR_T *command = command_ps;
1682 while (cursor > 0 && BB_isspace(command[cursor-1]))
1684 while (cursor > 0 && !BB_isspace(command[cursor-1]))
1689 vi_back_motion(void)
1691 CHAR_T *command = command_ps;
1696 while (cursor > 0 && BB_isspace(command[cursor]))
1700 if (BB_isalnum_or_underscore(command[cursor])) {
1702 && (BB_isalnum_or_underscore(command[cursor-1]))
1706 } else if (BB_ispunct(command[cursor])) {
1707 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1713 /* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1714 static void ctrl_left(void)
1716 CHAR_T *command = command_ps;
1724 c = command[cursor];
1725 if (c != ' ' && !BB_ispunct(c)) {
1726 /* we reached a "word" delimited by spaces/punct.
1727 * go to its beginning */
1729 c = command[cursor - 1];
1730 if (c == ' ' || BB_ispunct(c))
1740 static void ctrl_right(void)
1742 CHAR_T *command = command_ps;
1747 c = command[cursor];
1750 if (c != ' ' && !BB_ispunct(c)) {
1751 /* we reached a "word" delimited by spaces/punct.
1752 * go to its end + 1 */
1755 c = command[cursor];
1756 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1767 * read_line_input and its helpers
1770 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1771 static void ask_terminal(void)
1773 /* Ask terminal where is the cursor now.
1774 * lineedit_read_key handles response and corrects
1775 * our idea of current cursor position.
1776 * Testcase: run "echo -n long_line_long_line_long_line",
1777 * then type in a long, wrapping command and try to
1778 * delete it using backspace key.
1779 * Note: we print it _after_ prompt, because
1780 * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1782 /* Problem: if there is buffered input on stdin,
1783 * the response will be delivered later,
1784 * possibly to an unsuspecting application.
1785 * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1787 * ~/srcdevel/bbox/fix/busybox.t4 #
1788 * ~/srcdevel/bbox/fix/busybox.t4 #
1789 * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 # <-- garbage
1790 * ~/srcdevel/bbox/fix/busybox.t4 #
1792 * Checking for input with poll only makes the race narrower,
1793 * I still can trigger it. Strace:
1795 * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1796 * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout) <-- no input exists
1797 * write(1, "\33[6n", 4) = 4 <-- send the ESC sequence, quick!
1798 * poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
1799 * read(0, "\n", 1) = 1 <-- oh crap, user's input got in first
1803 pfd.fd = STDIN_FILENO;
1804 pfd.events = POLLIN;
1805 if (safe_poll(&pfd, 1, 0) == 0) {
1806 S.sent_ESC_br6n = 1;
1807 fputs(ESC"[6n", stdout);
1808 fflush_all(); /* make terminal see it ASAP! */
1812 #define ask_terminal() ((void)0)
1815 /* Note about multi-line PS1 (e.g. "\n\w \u@\h\n> ") and prompt redrawing:
1817 * If the prompt has any newlines, after we print it once we use only its last
1818 * line to redraw in-place, which makes it simpler to calculate how many lines
1819 * we should move the cursor up to align the redraw (cmdedit_y). The earlier
1820 * prompt lines just stay on screen and we redraw below them.
1822 * Use cases for all prompt lines beyond the initial draw:
1823 * - After clear-screen (^L) or after displaying tab-completion choices, we
1824 * print the full prompt, as it isn't redrawn in-place.
1825 * - During terminal resize we could try to redraw all lines, but we don't,
1826 * because it requires delicate alignment, it's good enough with only the
1827 * last line, and doing it wrong is arguably worse than not doing it at all.
1829 * Terminology wise, if it doesn't mention "full", then it means the last/sole
1830 * prompt line. We use the prompt (last/sole line) while redrawing in-place,
1831 * and the full where we need a fresh one unrelated to an earlier position.
1833 * If PS1 is not multiline, the last/sole line and the full are the same string.
1836 /* Called just once at read_line_input() init time */
1837 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1838 static void parse_and_put_prompt(const char *prmt_ptr)
1841 cmdedit_prompt = prompt_last_line = prmt_ptr;
1842 p = strrchr(prmt_ptr, '\n');
1844 prompt_last_line = p + 1;
1845 cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
1849 static void parse_and_put_prompt(const char *prmt_ptr)
1852 char *prmt_mem_ptr = xzalloc(1);
1853 # if ENABLE_USERNAME_OR_HOMEDIR
1854 char *cwd_buf = NULL;
1856 char flg_not_length = '[';
1859 /*cmdedit_prmt_len = 0; - already is */
1861 cbuf[1] = '\0'; /* never changes */
1864 char timebuf[sizeof("HH:MM:SS")];
1865 char *free_me = NULL;
1875 * Supported via bb_process_escape_sequence:
1876 * \a ASCII bell character (07)
1877 * \e ASCII escape character (033)
1879 * \r carriage return
1881 * \nnn char with octal code nnn
1883 * \$ if the effective UID is 0, a #, otherwise a $
1884 * \w current working directory, with $HOME abbreviated with a tilde
1885 * Note: we do not support $PROMPT_DIRTRIM=n feature
1886 * \W basename of the current working directory, with $HOME abbreviated with a tilde
1887 * \h hostname up to the first '.'
1890 * \[ begin a sequence of non-printing characters
1891 * \] end a sequence of non-printing characters
1892 * \T current time in 12-hour HH:MM:SS format
1893 * \@ current time in 12-hour am/pm format
1894 * \A current time in 24-hour HH:MM format
1895 * \t current time in 24-hour HH:MM:SS format
1896 * (all of the above work as \A)
1898 * \! history number of this command
1899 * \# command number of this command
1900 * \j number of jobs currently managed by the shell
1901 * \l basename of the shell's terminal device name
1902 * \s name of the shell, the basename of $0 (the portion following the final slash)
1903 * \V release of bash, version + patch level (e.g., 2.00.0)
1904 * \d date in "Weekday Month Date" format (e.g., "Tue May 26")
1906 * format is passed to strftime(3).
1907 * An empty format results in a locale-specific time representation.
1908 * The braces are required.
1909 * Mishandled by bb_process_escape_sequence:
1910 * \v version of bash (e.g., 2.00)
1914 if (c != 't') /* don't treat \t as tab */
1915 c = bb_process_escape_sequence(&prmt_ptr);
1916 if (prmt_ptr == cp) {
1922 # if ENABLE_USERNAME_OR_HOMEDIR
1924 pbuf = user_buf ? user_buf : (char*)"";
1929 pbuf = free_me = safe_gethostname();
1931 strchrnul(pbuf, '.')[0] = '\0';
1934 c = (geteuid() == 0 ? '#' : '$');
1936 case 'T': /* 12-hour HH:MM:SS format */
1937 case '@': /* 12-hour am/pm format */
1938 case 'A': /* 24-hour HH:MM format */
1939 case 't': /* 24-hour HH:MM:SS format */
1940 /* We show all of them as 24-hour HH:MM */
1941 strftime_HHMMSS(timebuf, sizeof(timebuf), NULL)[-3] = '\0';
1944 # if ENABLE_USERNAME_OR_HOMEDIR
1945 case 'w': /* current dir */
1946 case 'W': /* basename of cur dir */
1948 cwd_buf = xrealloc_getcwd_or_warn(NULL);
1950 cwd_buf = (char *)bb_msg_unknown;
1951 else if (home_pwd_buf[0]) {
1952 char *after_home_user;
1954 /* /home/user[/something] -> ~[/something] */
1955 after_home_user = is_prefixed_with(cwd_buf, home_pwd_buf);
1957 && (*after_home_user == '/' || *after_home_user == '\0')
1960 overlapping_strcpy(cwd_buf + 1, after_home_user);
1967 cp = strrchr(pbuf, '/');
1969 pbuf = (char*)cp + 1;
1972 // bb_process_escape_sequence does this now:
1973 // case 'e': case 'E': /* \e \E = \033 */
1976 case 'x': case 'X': {
1978 for (l = 0; l < 3;) {
1980 buf2[l++] = *prmt_ptr;
1982 h = strtoul(buf2, &pbuf, 16);
1983 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1989 c = (char)strtoul(buf2, NULL, 16);
1996 if (c == flg_not_length) {
1997 /* Toggle '['/']' hex 5b/5d */
1998 flg_not_length ^= 6;
2007 int n = strlen(pbuf);
2010 cmdedit_prmt_len = 0;
2011 else if (flg_not_length != ']') {
2012 #if 0 /*ENABLE_UNICODE_SUPPORT*/
2013 /* Won't work, pbuf is one BYTE string here instead of an one Unicode char string. */
2015 cmdedit_prmt_len += unicode_strwidth(pbuf);
2017 cmdedit_prmt_len += n;
2021 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_size+1), pbuf);
2025 # if ENABLE_USERNAME_OR_HOMEDIR
2026 if (cwd_buf != (char *)bb_msg_unknown)
2029 /* see comment (above this function) about multiline prompt redrawing */
2030 cmdedit_prompt = prompt_last_line = prmt_mem_ptr;
2031 prmt_ptr = strrchr(cmdedit_prompt, '\n');
2033 prompt_last_line = prmt_ptr + 1;
2038 #if ENABLE_FEATURE_EDITING_WINCH
2039 static void cmdedit_setwidth(void)
2043 cmdedit_termw = get_terminal_width(STDIN_FILENO);
2044 /* new y for current cursor */
2045 new_y = (cursor + cmdedit_prmt_len) / cmdedit_termw;
2047 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
2050 static void win_changed(int nsig UNUSED_PARAM)
2052 if (S.ok_to_redraw) {
2053 /* We are in read_key(), safe to redraw immediately */
2054 int sv_errno = errno;
2059 /* Signal main loop that redraw is necessary */
2065 static int lineedit_read_key(char *read_key_buffer, int timeout)
2068 #if ENABLE_UNICODE_SUPPORT
2069 char unicode_buf[MB_CUR_MAX + 1];
2070 int unicode_idx = 0;
2075 /* Wait for input. TIMEOUT = -1 makes read_key wait even
2076 * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
2077 * insist on full MB_CUR_MAX buffer to declare input like
2078 * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
2080 * Note: read_key sets errno to 0 on success.
2082 IF_FEATURE_EDITING_WINCH(S.ok_to_redraw = 1;)
2083 ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
2084 IF_FEATURE_EDITING_WINCH(S.ok_to_redraw = 0;)
2086 #if ENABLE_UNICODE_SUPPORT
2087 if (errno == EAGAIN && unicode_idx != 0)
2093 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2094 if ((int32_t)ic == KEYCODE_CURSOR_POS
2097 S.sent_ESC_br6n = 0;
2098 if (cursor == 0) { /* otherwise it may be bogus */
2099 int col = ((ic >> 32) & 0x7fff) - 1;
2101 * Is col > cmdedit_prmt_len?
2102 * If yes (terminal says cursor is farther to the right
2103 * of where we think it should be),
2104 * the prompt wasn't printed starting at col 1,
2105 * there was additional text before it.
2107 if ((int)(col - cmdedit_prmt_len) > 0) {
2108 /* Fix our understanding of current x position */
2109 cmdedit_x += (col - cmdedit_prmt_len);
2110 while (cmdedit_x >= cmdedit_termw) {
2111 cmdedit_x -= cmdedit_termw;
2120 #if ENABLE_UNICODE_SUPPORT
2121 if (unicode_status == UNICODE_ON) {
2124 if ((int32_t)ic < 0) /* KEYCODE_xxx */
2126 // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
2128 unicode_buf[unicode_idx++] = ic;
2129 unicode_buf[unicode_idx] = '\0';
2130 if (mbstowcs(&wc, unicode_buf, 1) != 1) {
2131 /* Not (yet?) a valid unicode char */
2132 if (unicode_idx < MB_CUR_MAX) {
2137 /* Invalid sequence. Save all "bad bytes" except first */
2138 read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
2139 # if !ENABLE_UNICODE_PRESERVE_BROKEN
2140 ic = CONFIG_SUBST_WCHAR;
2142 ic = unicode_mark_raw_byte(unicode_buf[0]);
2145 /* Valid unicode char, return its code */
2156 #if ENABLE_UNICODE_BIDI_SUPPORT
2157 static int isrtl_str(void)
2161 while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
2163 return unicode_bidi_isrtl(command_ps[idx]);
2166 # define isrtl_str() 0
2169 /* leave out the "vi-mode"-only case labels if vi editing isn't
2171 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
2173 /* convert uppercase ascii to equivalent control char, for readability */
2175 #define CTRL(a) ((a) & ~0x40)
2178 VI_CMDMODE_BIT = 0x40000000,
2179 /* 0x80000000 bit flags KEYCODE_xxx */
2182 #if ENABLE_FEATURE_REVERSE_SEARCH
2183 /* Mimic readline Ctrl-R reverse history search.
2184 * When invoked, it shows the following prompt:
2185 * (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R]
2186 * and typing results in search being performed:
2187 * (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp]
2188 * Search is performed by looking at progressively older lines in history.
2189 * Ctrl-R again searches for the next match in history.
2190 * Backspace deletes last matched char.
2191 * Control keys exit search and return to normal editing (at current history line).
2193 static int32_t reverse_i_search(int timeout)
2195 char match_buf[128]; /* for user input */
2196 char read_key_buffer[KEYCODE_BUFFER_SIZE];
2197 const char *matched_history_line;
2198 const char *saved_prompt;
2199 unsigned saved_prmt_len;
2202 matched_history_line = NULL;
2203 read_key_buffer[0] = 0;
2204 match_buf[0] = '\0';
2206 /* Save and replace the prompt */
2207 saved_prompt = prompt_last_line;
2208 saved_prmt_len = cmdedit_prmt_len;
2213 unsigned match_buf_len = strlen(match_buf);
2215 //FIXME: correct timeout? (i.e. count it down?)
2216 ic = lineedit_read_key(read_key_buffer, timeout);
2219 case CTRL('R'): /* searching for the next match */
2225 if (unicode_status == UNICODE_ON) {
2226 while (match_buf_len != 0) {
2227 uint8_t c = match_buf[--match_buf_len];
2228 if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */
2232 if (match_buf_len != 0)
2235 match_buf[match_buf_len] = '\0';
2240 || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2241 || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2246 /* Append this char */
2247 #if ENABLE_UNICODE_SUPPORT
2248 if (unicode_status == UNICODE_ON) {
2249 mbstate_t mbstate = { 0 };
2250 char buf[MB_CUR_MAX + 1];
2251 int len = wcrtomb(buf, ic, &mbstate);
2254 if (match_buf_len + len < sizeof(match_buf))
2255 strcpy(match_buf + match_buf_len, buf);
2259 if (match_buf_len < sizeof(match_buf) - 1) {
2260 match_buf[match_buf_len] = ic;
2261 match_buf[match_buf_len + 1] = '\0';
2266 /* Search in history for match_buf */
2267 h = state->cur_history;
2268 if (ic == CTRL('R'))
2271 if (state->history[h]) {
2272 char *match = strstr(state->history[h], match_buf);
2274 state->cur_history = h;
2275 matched_history_line = state->history[h];
2276 command_len = load_string(matched_history_line);
2277 cursor = match - matched_history_line;
2278 //FIXME: cursor position for Unicode case
2280 free((char*)prompt_last_line);
2282 prompt_last_line = xasprintf("(reverse-i-search)'%s': ", match_buf);
2283 cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
2291 match_buf[match_buf_len] = '\0';
2296 redraw(cmdedit_y, command_len - cursor);
2300 if (matched_history_line)
2301 command_len = load_string(matched_history_line);
2303 free((char*)prompt_last_line);
2304 prompt_last_line = saved_prompt;
2305 cmdedit_prmt_len = saved_prmt_len;
2306 redraw(cmdedit_y, command_len - cursor);
2312 /* maxsize must be >= 2.
2314 * -1 on read errors or EOF, or on bare Ctrl-D,
2315 * 0 on ctrl-C (the line entered is still returned in 'command'),
2316 * (in both cases the cursor remains on the input line, '\n' is not printed)
2317 * >0 length of input string, including terminating '\n'
2319 int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize)
2323 #if ENABLE_FEATURE_TAB_COMPLETION
2324 smallint lastWasTab = 0;
2326 smallint break_out = 0;
2327 #if ENABLE_FEATURE_EDITING_VI
2328 smallint vi_cmdmode = 0;
2330 struct termios initial_settings;
2331 struct termios new_settings;
2332 char read_key_buffer[KEYCODE_BUFFER_SIZE];
2336 n = get_termios_and_make_raw(STDIN_FILENO, &new_settings, &initial_settings, 0
2337 | TERMIOS_CLEAR_ISIG /* turn off INTR (ctrl-C), QUIT, SUSP */
2339 if (n != 0 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON) {
2340 /* Happens when e.g. stty -echo was run before.
2341 * But if ICANON is not set, we don't come here.
2342 * (example: interactive python ^Z-backgrounded,
2343 * tty is still in "raw mode").
2345 parse_and_put_prompt(prompt);
2347 if (fgets(command, maxsize, stdin) == NULL)
2348 len = -1; /* EOF or error */
2350 len = strlen(command);
2357 // FIXME: audit & improve this
2358 if (maxsize > MAX_LINELEN)
2359 maxsize = MAX_LINELEN;
2360 S.maxsize = maxsize;
2363 /* Make state->flags == 0 if st is NULL.
2364 * With zeroed flags, no other fields are ever referenced.
2366 state = (line_input_t*) &const_int_0;
2369 timeout = st->timeout;
2372 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
2373 if (state->hist_file)
2374 if (state->cnt_history == 0)
2375 load_history(state);
2377 if (state->flags & DO_HISTORY)
2378 state->cur_history = state->cnt_history;
2381 /* prepare before init handlers */
2382 cmdedit_y = 0; /* quasireal y, not true if line > xt*yt */
2384 #if ENABLE_UNICODE_SUPPORT
2385 command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
2387 command_ps = command;
2390 #define command command_must_not_be_used
2392 tcsetattr_stdin_TCSANOW(&new_settings);
2394 #if ENABLE_USERNAME_OR_HOMEDIR
2396 struct passwd *entry;
2398 entry = getpwuid(geteuid());
2400 user_buf = xstrdup(entry->pw_name);
2401 home_pwd_buf = xstrdup(entry->pw_dir);
2407 for (i = 0; i <= state->max_history; i++)
2408 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
2409 bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
2412 /* Get width (before printing prompt) */
2413 cmdedit_termw = get_terminal_width(STDIN_FILENO);
2414 /* Print out the command prompt, optionally ask where cursor is */
2415 parse_and_put_prompt(prompt);
2418 #if ENABLE_FEATURE_EDITING_WINCH
2419 /* Install window resize handler (NB: after *all* init is complete) */
2420 S.SIGWINCH_handler.sa_handler = win_changed;
2421 S.SIGWINCH_handler.sa_flags = SA_RESTART;
2422 sigaction(SIGWINCH, &S.SIGWINCH_handler, &S.SIGWINCH_handler);
2424 read_key_buffer[0] = 0;
2427 * The emacs and vi modes share much of the code in the big
2428 * command loop. Commands entered when in vi's command mode
2429 * (aka "escape mode") get an extra bit added to distinguish
2430 * them - this keeps them from being self-inserted. This
2431 * clutters the big switch a bit, but keeps all the code
2435 #if ENABLE_FEATURE_EDITING_WINCH
2438 count = S.SIGWINCH_count;
2439 if (S.SIGWINCH_saved != count) {
2440 S.SIGWINCH_saved = count;
2444 ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
2446 #if ENABLE_FEATURE_REVERSE_SEARCH
2449 #if ENABLE_FEATURE_EDITING_VI
2452 /* btw, since KEYCODE_xxx are all < 0, this doesn't
2453 * change ic if it contains one of them: */
2454 ic |= VI_CMDMODE_BIT;
2461 vi_case('\n'|VI_CMDMODE_BIT:)
2462 vi_case('\r'|VI_CMDMODE_BIT:)
2468 vi_case('0'|VI_CMDMODE_BIT:)
2469 /* Control-a -- Beginning of line */
2470 input_backward(cursor);
2473 vi_case('h'|VI_CMDMODE_BIT:)
2474 vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
2475 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
2476 input_backward(1); /* Move back one character */
2479 vi_case('$'|VI_CMDMODE_BIT:)
2480 /* Control-e -- End of line */
2481 put_till_end_and_adv_cursor();
2484 vi_case('l'|VI_CMDMODE_BIT:)
2485 vi_case(' '|VI_CMDMODE_BIT:)
2486 input_forward(); /* Move forward one character */
2489 case '\x7f': /* DEL */
2495 case KEYCODE_DELETE:
2501 #if ENABLE_FEATURE_TAB_COMPLETION
2503 input_tab(&lastWasTab);
2507 /* Control-k -- clear to end of line */
2508 command_ps[cursor] = BB_NUL;
2509 command_len = cursor;
2510 printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
2513 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
2514 /* Control-l -- clear screen */
2515 /* cursor to top,left; clear to the end of screen */
2516 printf(ESC"[H" ESC"[J");
2517 draw_full(command_len - cursor);
2521 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
2522 vi_case('j'|VI_CMDMODE_BIT:)
2523 /* Control-n -- Get next command in history */
2524 if (get_next_history())
2528 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
2529 vi_case('k'|VI_CMDMODE_BIT:)
2530 /* Control-p -- Get previous command from history */
2531 if (get_previous_history())
2536 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
2537 /* Control-U -- Clear line before cursor */
2539 command_len -= cursor;
2540 memmove(command_ps, command_ps + cursor,
2541 (command_len + 1) * sizeof(command_ps[0]));
2542 redraw(cmdedit_y, command_len);
2546 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
2547 /* Control-W -- Remove the last word */
2548 while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
2550 while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
2553 case KEYCODE_ALT_D: {
2554 /* Delete word forward */
2555 int nc, sc = cursor;
2563 case KEYCODE_ALT_BACKSPACE: {
2564 /* Delete word backward */
2567 while (sc-- > cursor)
2571 #if ENABLE_FEATURE_REVERSE_SEARCH
2573 ic = ic_raw = reverse_i_search(timeout);
2577 #if ENABLE_FEATURE_EDITING_VI
2578 case 'i'|VI_CMDMODE_BIT:
2581 case 'I'|VI_CMDMODE_BIT:
2582 input_backward(cursor);
2585 case 'a'|VI_CMDMODE_BIT:
2589 case 'A'|VI_CMDMODE_BIT:
2590 put_till_end_and_adv_cursor();
2593 case 'x'|VI_CMDMODE_BIT:
2596 case 'X'|VI_CMDMODE_BIT:
2602 case 'W'|VI_CMDMODE_BIT:
2605 case 'w'|VI_CMDMODE_BIT:
2608 case 'E'|VI_CMDMODE_BIT:
2611 case 'e'|VI_CMDMODE_BIT:
2614 case 'B'|VI_CMDMODE_BIT:
2617 case 'b'|VI_CMDMODE_BIT:
2620 case 'C'|VI_CMDMODE_BIT:
2623 case 'D'|VI_CMDMODE_BIT:
2626 case 'c'|VI_CMDMODE_BIT:
2629 case 'd'|VI_CMDMODE_BIT: {
2632 ic = lineedit_read_key(read_key_buffer, timeout);
2633 if (errno) /* error */
2634 goto return_error_indicator;
2635 if (ic == ic_raw) { /* "cc", "dd" */
2636 input_backward(cursor);
2648 case 'w': /* "dw", "cw" */
2649 vi_word_motion(vi_cmdmode);
2651 case 'W': /* 'dW', 'cW' */
2652 vi_Word_motion(vi_cmdmode);
2654 case 'e': /* 'de', 'ce' */
2658 case 'E': /* 'dE', 'cE' */
2664 input_backward(cursor - sc);
2665 while (nc-- > cursor)
2668 case 'b': /* "db", "cb" */
2669 case 'B': /* implemented as B */
2674 while (sc-- > cursor)
2677 case ' ': /* "d ", "c " */
2680 case '$': /* "d$", "c$" */
2682 while (cursor < command_len)
2688 case 'p'|VI_CMDMODE_BIT:
2691 case 'P'|VI_CMDMODE_BIT:
2694 case 'r'|VI_CMDMODE_BIT:
2695 //FIXME: unicode case?
2696 ic = lineedit_read_key(read_key_buffer, timeout);
2697 if (errno) /* error */
2698 goto return_error_indicator;
2699 if (ic < ' ' || ic > 255) {
2702 command_ps[cursor] = ic;
2707 case '\x1b': /* ESC */
2708 if (state->flags & VI_MODE) {
2709 /* insert mode --> command mode */
2714 #endif /* FEATURE_COMMAND_EDITING_VI */
2718 if (get_previous_history())
2723 if (!get_next_history())
2726 /* Rewrite the line with the selected history item */
2727 /* change command */
2728 command_len = load_string(state->history[state->cur_history] ?
2729 state->history[state->cur_history] : "");
2730 /* redraw and go to eol (bol, in vi) */
2731 redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2740 case KEYCODE_CTRL_LEFT:
2741 case KEYCODE_ALT_LEFT: /* bash doesn't do it */
2744 case KEYCODE_CTRL_RIGHT:
2745 case KEYCODE_ALT_RIGHT: /* bash doesn't do it */
2749 input_backward(cursor);
2752 put_till_end_and_adv_cursor();
2756 if (initial_settings.c_cc[VINTR] != 0
2757 && ic_raw == initial_settings.c_cc[VINTR]
2759 /* Ctrl-C (usually) - stop gathering input */
2761 break_out = -1; /* "do not append '\n'" */
2764 if (initial_settings.c_cc[VEOF] != 0
2765 && ic_raw == initial_settings.c_cc[VEOF]
2767 /* Ctrl-D (usually) - delete one character,
2768 * or exit if len=0 and no chars to delete */
2769 if (command_len == 0) {
2772 case -1: /* error (e.g. EIO when tty is destroyed) */
2773 IF_FEATURE_EDITING_VI(return_error_indicator:)
2774 break_out = command_len = -1;
2780 // /* Control-V -- force insert of next char */
2781 // if (c == CTRL('V')) {
2782 // if (safe_read(STDIN_FILENO, &c, 1) < 1)
2783 // goto return_error_indicator;
2790 || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2791 || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2793 /* If VI_CMDMODE_BIT is set, ic is >= 256
2794 * and vi mode ignores unexpected chars.
2795 * Otherwise, we are here if ic is a
2796 * control char or an unhandled ESC sequence,
2797 * which is also ignored.
2801 if ((int)command_len >= (maxsize - 2)) {
2802 /* Not enough space for the char and EOL */
2807 if (cursor == (command_len - 1)) {
2808 /* We are at the end, append */
2809 command_ps[cursor] = ic;
2810 command_ps[cursor + 1] = BB_NUL;
2811 put_cur_glyph_and_inc_cursor();
2812 if (unicode_bidi_isrtl(ic))
2815 /* In the middle, insert */
2818 memmove(command_ps + sc + 1, command_ps + sc,
2819 (command_len - sc) * sizeof(command_ps[0]));
2820 command_ps[sc] = ic;
2821 /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
2824 put_till_end_and_adv_cursor();
2825 /* to prev x pos + 1 */
2826 input_backward(cursor - sc);
2834 #if ENABLE_FEATURE_TAB_COMPLETION
2840 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2841 if (S.sent_ESC_br6n) {
2842 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2843 * We sent "ESC [ 6 n", but got '\n' first, and
2844 * KEYCODE_CURSOR_POS response is now buffered from terminal.
2845 * It's bad already and not much can be done with it
2846 * (it _will_ be visible for the next process to read stdin),
2847 * but without this delay it even shows up on the screen
2848 * as garbage because we restore echo settings with tcsetattr
2849 * before it comes in. UGLY!
2855 /* End of bug-catching "command_must_not_be_used" trick */
2858 #if ENABLE_UNICODE_SUPPORT
2860 if (command_len > 0)
2861 command_len = save_string(command, maxsize - 1);
2865 if (command_len > 0) {
2866 remember_in_history(command);
2869 if (break_out > 0) {
2870 command[command_len++] = '\n';
2871 command[command_len] = '\0';
2874 #if ENABLE_FEATURE_TAB_COMPLETION
2875 free_tab_completion_data();
2878 /* restore initial_settings */
2879 tcsetattr_stdin_TCSANOW(&initial_settings);
2880 #if ENABLE_FEATURE_EDITING_WINCH
2881 /* restore SIGWINCH handler */
2882 sigaction_set(SIGWINCH, &S.SIGWINCH_handler);
2889 return len; /* can't return command_len, DEINIT_S() destroys it */
2892 #else /* !FEATURE_EDITING */
2894 #undef read_line_input
2895 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2897 fputs(prompt, stdout);
2899 if (!fgets(command, maxsize, stdin))
2901 return strlen(command);
2904 #endif /* !FEATURE_EDITING */
2915 const char *applet_name = "debug stuff usage";
2917 int main(int argc, char **argv)
2919 char buff[MAX_LINELEN];
2921 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2922 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2923 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2924 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[m\\]";
2931 l = read_line_input(prompt, buff);
2932 if (l <= 0 || buff[l-1] != '\n')
2935 printf("*** read_line_input() returned line =%s=\n", buff);
2937 printf("*** read_line_input() detect ^D\n");