libbb/lineedit.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Termios command line History and Editing.
   4  *
   5  * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
   6  * Written by:   Vladimir Oleynik <dzo@simtreas.ru>
   7  *
   8  * Used ideas:
   9  *      Adam Rogoyski    <rogoyski@cs.utexas.edu>
  10  *      Dave Cinege      <dcinege@psychosis.com>
  11  *      Jakub Jelinek (c) 1995
  12  *      Erik Andersen    <andersen@codepoet.org> (Majorly adjusted for busybox)
  13  *
  14  * This code is 'as is' with no warranty.
  15  */
  16
  17 /*
  18  * Usage and known bugs:
  19  * Terminal key codes are not extensive, more needs to be added.
  20  * This version was created on Debian GNU/Linux 2.x.
  21  * Delete, Backspace, Home, End, and the arrow keys were tested
  22  * to work in an Xterm and console. Ctrl-A also works as Home.
  23  * Ctrl-E also works as End.
  24  *
  25  * The following readline-like commands are not implemented:
  26  * ESC-b -- Move back one word
  27  * ESC-f -- Move forward one word
  28  * ESC-d -- Delete forward one word
  29  * CTL-t -- Transpose two characters
  30  *
  31  * lineedit does not know that the terminal escape sequences do not
  32  * take up space on the screen. The redisplay code assumes, unless
  33  * told otherwise, that each character in the prompt is a printable
  34  * character that takes up one character position on the screen.
  35  * You need to tell lineedit that some sequences of characters
  36  * in the prompt take up no screen space. Compatibly with readline,
  37  * use the \[ escape to begin a sequence of non-printing characters,
  38  * and the \] escape to signal the end of such a sequence. Example:
  39  *
  40  * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
  41  */
  42 #include "libbb.h"
  43 #include "unicode.h"
  44
  45 #ifdef TEST
  46 # define ENABLE_FEATURE_EDITING 0
  47 # define ENABLE_FEATURE_TAB_COMPLETION 0
  48 # define ENABLE_FEATURE_USERNAME_COMPLETION 0
  49 #endif
  50
  51
  52 /* Entire file (except TESTing part) sits inside this #if */
  53 #if ENABLE_FEATURE_EDITING
  54
  55
  56 #define ENABLE_USERNAME_OR_HOMEDIR \
  57         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  58 #define IF_USERNAME_OR_HOMEDIR(...)
  59 #if ENABLE_USERNAME_OR_HOMEDIR
  60 # undef IF_USERNAME_OR_HOMEDIR
  61 # define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
  62 #endif
  63
  64
  65 #undef CHAR_T
  66 #if ENABLE_UNICODE_SUPPORT
  67 # define BB_NUL ((wchar_t)0)
  68 # define CHAR_T wchar_t
  69 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
  70 # if ENABLE_FEATURE_EDITING_VI
  71 static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
  72 # endif
  73 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
  74 # undef isspace
  75 # undef isalnum
  76 # undef ispunct
  77 # undef isprint
  78 # define isspace isspace_must_not_be_used
  79 # define isalnum isalnum_must_not_be_used
  80 # define ispunct ispunct_must_not_be_used
  81 # define isprint isprint_must_not_be_used
  82 #else
  83 # define BB_NUL '\0'
  84 # define CHAR_T char
  85 # define BB_isspace(c) isspace(c)
  86 # define BB_isalnum(c) isalnum(c)
  87 # define BB_ispunct(c) ispunct(c)
  88 #endif
  89 #if ENABLE_UNICODE_PRESERVE_BROKEN
  90 # define unicode_mark_raw_byte(wc)   ((wc) | 0x20000000)
  91 # define unicode_is_raw_byte(wc)     ((wc) & 0x20000000)
  92 #else
  93 # define unicode_is_raw_byte(wc)     0
  94 #endif
  95
  96
  97 #define SEQ_CLEAR_TILL_END_OF_SCREEN "\033[J"
  98 //#define SEQ_CLEAR_TILL_END_OF_LINE   "\033[K"
  99
 100
 101 enum {
 102         /* We use int16_t for positions, need to limit line len */
 103         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
 104                       ? CONFIG_FEATURE_EDITING_MAX_LEN
 105                       : 0x7ff0
 106 };
 107
 108 #if ENABLE_USERNAME_OR_HOMEDIR
 109 static const char null_str[] ALIGN1 = "";
 110 #endif
 111
 112 /* We try to minimize both static and stack usage. */
 113 struct lineedit_statics {
 114         line_input_t *state;
 115
 116         volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
 117         sighandler_t previous_SIGWINCH_handler;
 118
 119         unsigned cmdedit_x;        /* real x (col) terminal position */
 120         unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
 121         unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
 122
 123         unsigned cursor;
 124         int command_len; /* must be signed */
 125         /* signed maxsize: we want x in "if (x > S.maxsize)"
 126          * to _not_ be promoted to unsigned */
 127         int maxsize;
 128         CHAR_T *command_ps;
 129
 130         const char *cmdedit_prompt;
 131 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 132         int num_ok_lines; /* = 1; */
 133 #endif
 134
 135 #if ENABLE_USERNAME_OR_HOMEDIR
 136         char *user_buf;
 137         char *home_pwd_buf; /* = (char*)null_str; */
 138 #endif
 139
 140 #if ENABLE_FEATURE_TAB_COMPLETION
 141         char **matches;
 142         unsigned num_matches;
 143 #endif
 144
 145 #if ENABLE_FEATURE_EDITING_VI
 146 # define DELBUFSIZ 128
 147         CHAR_T *delptr;
 148         smallint newdelflag;     /* whether delbuf should be reused yet */
 149         CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 150 #endif
 151 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 152         smallint sent_ESC_br6n;
 153 #endif
 154
 155         /* Formerly these were big buffers on stack: */
 156 #if ENABLE_FEATURE_TAB_COMPLETION
 157         char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
 158         char input_tab__matchBuf[MAX_LINELEN];
 159         int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
 160         int16_t find_match__pos_buf[MAX_LINELEN + 1];
 161 #endif
 162 };
 163
 164 /* See lineedit_ptr_hack.c */
 165 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 166
 167 #define S (*lineedit_ptr_to_statics)
 168 #define state            (S.state           )
 169 #define cmdedit_termw    (S.cmdedit_termw   )
 170 #define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
 171 #define cmdedit_x        (S.cmdedit_x       )
 172 #define cmdedit_y        (S.cmdedit_y       )
 173 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 174 #define cursor           (S.cursor          )
 175 #define command_len      (S.command_len     )
 176 #define command_ps       (S.command_ps      )
 177 #define cmdedit_prompt   (S.cmdedit_prompt  )
 178 #define num_ok_lines     (S.num_ok_lines    )
 179 #define user_buf         (S.user_buf        )
 180 #define home_pwd_buf     (S.home_pwd_buf    )
 181 #define matches          (S.matches         )
 182 #define num_matches      (S.num_matches     )
 183 #define delptr           (S.delptr          )
 184 #define newdelflag       (S.newdelflag      )
 185 #define delbuf           (S.delbuf          )
 186
 187 #define INIT_S() do { \
 188         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 189         barrier(); \
 190         cmdedit_termw = 80; \
 191         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
 192         IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 193 } while (0)
 194 static void deinit_S(void)
 195 {
 196 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 197         /* This one is allocated only if FANCY_PROMPT is on
 198          * (otherwise it points to verbatim prompt (NOT malloced) */
 199         free((char*)cmdedit_prompt);
 200 #endif
 201 #if ENABLE_USERNAME_OR_HOMEDIR
 202         free(user_buf);
 203         if (home_pwd_buf != null_str)
 204                 free(home_pwd_buf);
 205 #endif
 206         free(lineedit_ptr_to_statics);
 207 }
 208 #define DEINIT_S() deinit_S()
 209
 210
 211 #if ENABLE_UNICODE_SUPPORT
 212 static size_t load_string(const char *src, int maxsize)
 213 {
 214         ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
 215         if (len < 0)
 216                 len = 0;
 217         command_ps[len] = 0;
 218         return len;
 219 }
 220 static unsigned save_string(char *dst, unsigned maxsize)
 221 {
 222 # if !ENABLE_UNICODE_PRESERVE_BROKEN
 223         ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
 224         if (len < 0)
 225                 len = 0;
 226         dst[len] = '\0';
 227         return len;
 228 # else
 229         unsigned dstpos = 0;
 230         unsigned srcpos = 0;
 231
 232         maxsize--;
 233         while (dstpos < maxsize) {
 234                 wchar_t wc;
 235                 int n = srcpos;
 236                 while ((wc = command_ps[srcpos]) != 0
 237                     && !unicode_is_raw_byte(wc)
 238                 ) {
 239                         srcpos++;
 240                 }
 241                 command_ps[srcpos] = 0;
 242                 n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
 243                 if (n < 0) /* should not happen */
 244                         break;
 245                 dstpos += n;
 246                 if (wc == 0) /* usually is */
 247                         break;
 248                 /* We do have invalid byte here! */
 249                 command_ps[srcpos] = wc; /* restore it */
 250                 srcpos++;
 251                 if (dstpos == maxsize)
 252                         break;
 253                 dst[dstpos++] = (char) wc;
 254         }
 255         dst[dstpos] = '\0';
 256         return dstpos;
 257 # endif
 258 }
 259 /* I thought just fputwc(c, stdout) would work. But no... */
 260 static void BB_PUTCHAR(wchar_t c)
 261 {
 262         char buf[MB_CUR_MAX + 1];
 263         mbstate_t mbst = { 0 };
 264         ssize_t len;
 265
 266         len = wcrtomb(buf, c, &mbst);
 267         if (len > 0) {
 268                 buf[len] = '\0';
 269                 fputs(buf, stdout);
 270         }
 271 }
 272 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
 273 static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
 274 # else
 275 static wchar_t adjust_width_and_validate_wc(wchar_t wc)
 276 #  define adjust_width_and_validate_wc(width_adj, wc) \
 277         ((*(width_adj))++, adjust_width_and_validate_wc(wc))
 278 # endif
 279 {
 280         int w = 1;
 281
 282         if (unicode_status == UNICODE_ON) {
 283                 if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
 284                         /* note: also true for unicode_is_raw_byte(wc) */
 285                         goto subst;
 286                 }
 287                 w = wcwidth(wc);
 288                 if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
 289                  || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
 290                  || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
 291                 ) {
 292  subst:
 293                         w = 1;
 294                         wc = CONFIG_SUBST_WCHAR;
 295                 }
 296         }
 297
 298 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
 299         *width_adj += w;
 300 #endif
 301         return wc;
 302 }
 303 #else /* !UNICODE */
 304 static size_t load_string(const char *src, int maxsize)
 305 {
 306         safe_strncpy(command_ps, src, maxsize);
 307         return strlen(command_ps);
 308 }
 309 # if ENABLE_FEATURE_TAB_COMPLETION
 310 static void save_string(char *dst, unsigned maxsize)
 311 {
 312         safe_strncpy(dst, command_ps, maxsize);
 313 }
 314 # endif
 315 # define BB_PUTCHAR(c) bb_putchar(c)
 316 /* Should never be called: */
 317 int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
 318 #endif
 319
 320
 321 /* Put 'command_ps[cursor]', cursor++.
 322  * Advance cursor on screen. If we reached right margin, scroll text up
 323  * and remove terminal margin effect by printing 'next_char' */
 324 #define HACK_FOR_WRONG_WIDTH 1
 325 static void put_cur_glyph_and_inc_cursor(void)
 326 {
 327         CHAR_T c = command_ps[cursor];
 328         unsigned width = 0;
 329         int ofs_to_right;
 330
 331         if (c == BB_NUL) {
 332                 /* erase character after end of input string */
 333                 c = ' ';
 334         } else {
 335                 /* advance cursor only if we aren't at the end yet */
 336                 cursor++;
 337                 if (unicode_status == UNICODE_ON) {
 338                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
 339                         c = adjust_width_and_validate_wc(&cmdedit_x, c);
 340                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
 341                 } else {
 342                         cmdedit_x++;
 343                 }
 344         }
 345
 346         ofs_to_right = cmdedit_x - cmdedit_termw;
 347         if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
 348                 /* c fits on this line */
 349                 BB_PUTCHAR(c);
 350         }
 351
 352         if (ofs_to_right >= 0) {
 353                 /* we go to the next line */
 354 #if HACK_FOR_WRONG_WIDTH
 355                 /* This works better if our idea of term width is wrong
 356                  * and it is actually wider (often happens on serial lines).
 357                  * Printing CR,LF *forces* cursor to next line.
 358                  * OTOH if terminal width is correct AND terminal does NOT
 359                  * have automargin (IOW: it is moving cursor to next line
 360                  * by itself (which is wrong for VT-10x terminals)),
 361                  * this will break things: there will be one extra empty line */
 362                 puts("\r"); /* + implicit '\n' */
 363 #else
 364                 /* VT-10x terminals don't wrap cursor to next line when last char
 365                  * on the line is printed - cursor stays "over" this char.
 366                  * Need to print _next_ char too (first one to appear on next line)
 367                  * to make cursor move down to next line.
 368                  */
 369                 /* Works ok only if cmdedit_termw is correct. */
 370                 c = command_ps[cursor];
 371                 if (c == BB_NUL)
 372                         c = ' ';
 373                 BB_PUTCHAR(c);
 374                 bb_putchar('\b');
 375 #endif
 376                 cmdedit_y++;
 377                 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
 378                         width = 0;
 379                 } else { /* ofs_to_right > 0 */
 380                         /* wide char c didn't fit on prev line */
 381                         BB_PUTCHAR(c);
 382                 }
 383                 cmdedit_x = width;
 384         }
 385 }
 386
 387 /* Move to end of line (by printing all chars till the end) */
 388 static void put_till_end_and_adv_cursor(void)
 389 {
 390         while (cursor < command_len)
 391                 put_cur_glyph_and_inc_cursor();
 392 }
 393
 394 /* Go to the next line */
 395 static void goto_new_line(void)
 396 {
 397         put_till_end_and_adv_cursor();
 398         if (cmdedit_x != 0)
 399                 bb_putchar('\n');
 400 }
 401
 402 static void beep(void)
 403 {
 404         bb_putchar('\007');
 405 }
 406
 407 static void put_prompt(void)
 408 {
 409         unsigned w;
 410
 411         fputs(cmdedit_prompt, stdout);
 412         fflush_all();
 413         cursor = 0;
 414         w = cmdedit_termw; /* read volatile var once */
 415         cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
 416         cmdedit_x = cmdedit_prmt_len % w;
 417 }
 418
 419 /* Move back one character */
 420 /* (optimized for slow terminals) */
 421 static void input_backward(unsigned num)
 422 {
 423         if (num > cursor)
 424                 num = cursor;
 425         if (num == 0)
 426                 return;
 427         cursor -= num;
 428
 429         if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
 430          && unicode_status == UNICODE_ON
 431         ) {
 432                 /* correct NUM to be equal to _screen_ width */
 433                 int n = num;
 434                 num = 0;
 435                 while (--n >= 0)
 436                         adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
 437                 if (num == 0)
 438                         return;
 439         }
 440
 441         if (cmdedit_x >= num) {
 442                 cmdedit_x -= num;
 443                 if (num <= 4) {
 444                         /* This is longer by 5 bytes on x86.
 445                          * Also gets miscompiled for ARM users
 446                          * (busybox.net/bugs/view.php?id=2274).
 447                          * printf(("\b\b\b\b" + 4) - num);
 448                          * return;
 449                          */
 450                         do {
 451                                 bb_putchar('\b');
 452                         } while (--num);
 453                         return;
 454                 }
 455                 printf("\033[%uD", num);
 456                 return;
 457         }
 458
 459         /* Need to go one or more lines up */
 460         if (ENABLE_UNICODE_WIDE_WCHARS) {
 461                 /* With wide chars, it is hard to "backtrack"
 462                  * and reliably figure out where to put cursor.
 463                  * Example (<> is a wide char; # is an ordinary char, _ cursor):
 464                  * |prompt: <><> |
 465                  * |<><><><><><> |
 466                  * |_            |
 467                  * and user presses left arrow. num = 1, cmdedit_x = 0,
 468                  * We need to go up one line, and then - how do we know that
 469                  * we need to go *10* positions to the right? Because
 470                  * |prompt: <>#<>|
 471                  * |<><><>#<><><>|
 472                  * |_            |
 473                  * in this situation we need to go *11* positions to the right.
 474                  *
 475                  * A simpler thing to do is to redraw everything from the start
 476                  * up to new cursor position (which is already known):
 477                  */
 478                 unsigned sv_cursor;
 479                 /* go to 1st column; go up to first line */
 480                 printf("\r" "\033[%uA", cmdedit_y);
 481                 cmdedit_y = 0;
 482                 sv_cursor = cursor;
 483                 put_prompt(); /* sets cursor to 0 */
 484                 while (cursor < sv_cursor)
 485                         put_cur_glyph_and_inc_cursor();
 486         } else {
 487                 int lines_up;
 488                 unsigned width;
 489                 /* num = chars to go back from the beginning of current line: */
 490                 num -= cmdedit_x;
 491                 width = cmdedit_termw; /* read volatile var once */
 492                 /* num=1...w: one line up, w+1...2w: two, etc: */
 493                 lines_up = 1 + (num - 1) / width;
 494                 cmdedit_x = (width * cmdedit_y - num) % width;
 495                 cmdedit_y -= lines_up;
 496                 /* go to 1st column; go up */
 497                 printf("\r" "\033[%uA", lines_up);
 498                 /* go to correct column.
 499                  * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
 500                  * need to *make sure* we skip it if cmdedit_x == 0 */
 501                 if (cmdedit_x)
 502                         printf("\033[%uC", cmdedit_x);
 503         }
 504 }
 505
 506 /* draw prompt, editor line, and clear tail */
 507 static void redraw(int y, int back_cursor)
 508 {
 509         if (y > 0) /* up y lines */
 510                 printf("\033[%uA", y);
 511         bb_putchar('\r');
 512         put_prompt();
 513         put_till_end_and_adv_cursor();
 514         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 515         input_backward(back_cursor);
 516 }
 517
 518 /* Delete the char in front of the cursor, optionally saving it
 519  * for later putback */
 520 #if !ENABLE_FEATURE_EDITING_VI
 521 static void input_delete(void)
 522 #define input_delete(save) input_delete()
 523 #else
 524 static void input_delete(int save)
 525 #endif
 526 {
 527         int j = cursor;
 528
 529         if (j == (int)command_len)
 530                 return;
 531
 532 #if ENABLE_FEATURE_EDITING_VI
 533         if (save) {
 534                 if (newdelflag) {
 535                         delptr = delbuf;
 536                         newdelflag = 0;
 537                 }
 538                 if ((delptr - delbuf) < DELBUFSIZ)
 539                         *delptr++ = command_ps[j];
 540         }
 541 #endif
 542
 543         memmove(command_ps + j, command_ps + j + 1,
 544                         /* (command_len + 1 [because of NUL]) - (j + 1)
 545                          * simplified into (command_len - j) */
 546                         (command_len - j) * sizeof(command_ps[0]));
 547         command_len--;
 548         put_till_end_and_adv_cursor();
 549         /* Last char is still visible, erase it (and more) */
 550         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 551         input_backward(cursor - j);     /* back to old pos cursor */
 552 }
 553
 554 #if ENABLE_FEATURE_EDITING_VI
 555 static void put(void)
 556 {
 557         int ocursor;
 558         int j = delptr - delbuf;
 559
 560         if (j == 0)
 561                 return;
 562         ocursor = cursor;
 563         /* open hole and then fill it */
 564         memmove(command_ps + cursor + j, command_ps + cursor,
 565                         (command_len - cursor + 1) * sizeof(command_ps[0]));
 566         memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
 567         command_len += j;
 568         put_till_end_and_adv_cursor();
 569         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 570 }
 571 #endif
 572
 573 /* Delete the char in back of the cursor */
 574 static void input_backspace(void)
 575 {
 576         if (cursor > 0) {
 577                 input_backward(1);
 578                 input_delete(0);
 579         }
 580 }
 581
 582 /* Move forward one character */
 583 static void input_forward(void)
 584 {
 585         if (cursor < command_len)
 586                 put_cur_glyph_and_inc_cursor();
 587 }
 588
 589 #if ENABLE_FEATURE_TAB_COMPLETION
 590
 591 static void free_tab_completion_data(void)
 592 {
 593         if (matches) {
 594                 while (num_matches)
 595                         free(matches[--num_matches]);
 596                 free(matches);
 597                 matches = NULL;
 598         }
 599 }
 600
 601 static void add_match(char *matched)
 602 {
 603         matches = xrealloc_vector(matches, 4, num_matches);
 604         matches[num_matches] = matched;
 605         num_matches++;
 606 }
 607
 608 #if ENABLE_FEATURE_USERNAME_COMPLETION
 609 static void username_tab_completion(char *ud, char *with_shash_flg)
 610 {
 611         struct passwd *entry;
 612         int userlen;
 613
 614         ud++;                           /* ~user/... to user/... */
 615         userlen = strlen(ud);
 616
 617         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 618                 char *sav_ud = ud - 1;
 619                 char *home = NULL;
 620
 621                 if (*ud == '/') {       /* "~/..."     */
 622                         home = home_pwd_buf;
 623                 } else {
 624                         /* "~user/..." */
 625                         char *temp;
 626                         temp = strchr(ud, '/');
 627                         *temp = '\0';           /* ~user\0 */
 628                         entry = getpwnam(ud);
 629                         *temp = '/';            /* restore ~user/... */
 630                         ud = temp;
 631                         if (entry)
 632                                 home = entry->pw_dir;
 633                 }
 634                 if (home) {
 635                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 636                                 /* /home/user/... */
 637                                 sprintf(sav_ud, "%s%s", home, ud);
 638                         }
 639                 }
 640         } else {
 641                 /* "~[^/]*" */
 642                 /* Using _r function to avoid pulling in static buffers */
 643                 char line_buff[256];
 644                 struct passwd pwd;
 645                 struct passwd *result;
 646
 647                 setpwent();
 648                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 649                         /* Null usernames should result in all users as possible completions. */
 650                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 651                                 add_match(xasprintf("~%s/", pwd.pw_name));
 652                         }
 653                 }
 654                 endpwent();
 655         }
 656 }
 657 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 658
 659 enum {
 660         FIND_EXE_ONLY = 0,
 661         FIND_DIR_ONLY = 1,
 662         FIND_FILE_ONLY = 2,
 663 };
 664
 665 static int path_parse(char ***p, int flags)
 666 {
 667         int npth;
 668         const char *pth;
 669         char *tmp;
 670         char **res;
 671
 672         /* if not setenv PATH variable, to search cur dir "." */
 673         if (flags != FIND_EXE_ONLY)
 674                 return 1;
 675
 676         if (state->flags & WITH_PATH_LOOKUP)
 677                 pth = state->path_lookup;
 678         else
 679                 pth = getenv("PATH");
 680         /* PATH=<empty> or PATH=:<empty> */
 681         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 682                 return 1;
 683
 684         tmp = (char*)pth;
 685         npth = 1; /* path component count */
 686         while (1) {
 687                 tmp = strchr(tmp, ':');
 688                 if (!tmp)
 689                         break;
 690                 if (*++tmp == '\0')
 691                         break;  /* :<empty> */
 692                 npth++;
 693         }
 694
 695         res = xmalloc(npth * sizeof(char*));
 696         res[0] = tmp = xstrdup(pth);
 697         npth = 1;
 698         while (1) {
 699                 tmp = strchr(tmp, ':');
 700                 if (!tmp)
 701                         break;
 702                 *tmp++ = '\0'; /* ':' -> '\0' */
 703                 if (*tmp == '\0')
 704                         break; /* :<empty> */
 705                 res[npth++] = tmp;
 706         }
 707         *p = res;
 708         return npth;
 709 }
 710
 711 static void exe_n_cwd_tab_completion(char *command, int type)
 712 {
 713         DIR *dir;
 714         struct dirent *next;
 715         struct stat st;
 716         char *path1[1];
 717         char **paths = path1;
 718         int npaths;
 719         int i;
 720         char *found;
 721         char *pfind = strrchr(command, '/');
 722 /*      char dirbuf[MAX_LINELEN]; */
 723 #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
 724
 725         npaths = 1;
 726         path1[0] = (char*)".";
 727
 728         if (pfind == NULL) {
 729                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 730                 npaths = path_parse(&paths, type);
 731                 pfind = command;
 732         } else {
 733                 /* dirbuf = ".../.../.../" */
 734                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 735 #if ENABLE_FEATURE_USERNAME_COMPLETION
 736                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 737                         username_tab_completion(dirbuf, dirbuf);
 738 #endif
 739                 paths[0] = dirbuf;
 740                 /* point to 'l' in "..../last_component" */
 741                 pfind++;
 742         }
 743
 744         for (i = 0; i < npaths; i++) {
 745                 dir = opendir(paths[i]);
 746                 if (!dir)
 747                         continue; /* don't print an error */
 748
 749                 while ((next = readdir(dir)) != NULL) {
 750                         int len1;
 751                         const char *str_found = next->d_name;
 752
 753                         /* matched? */
 754                         if (strncmp(str_found, pfind, strlen(pfind)))
 755                                 continue;
 756                         /* not see .name without .match */
 757                         if (*str_found == '.' && *pfind == '\0') {
 758                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 759                                         continue;
 760                                 str_found = ""; /* only "/" */
 761                         }
 762                         found = concat_path_file(paths[i], str_found);
 763                         /* hmm, remove in progress? */
 764                         /* NB: stat() first so that we see is it a directory;
 765                          * but if that fails, use lstat() so that
 766                          * we still match dangling links */
 767                         if (stat(found, &st) && lstat(found, &st))
 768                                 goto cont;
 769                         /* find with dirs? */
 770                         if (paths[i] != dirbuf)
 771                                 strcpy(found, next->d_name); /* only name */
 772
 773                         len1 = strlen(found);
 774                         found = xrealloc(found, len1 + 2);
 775                         found[len1] = '\0';
 776                         found[len1+1] = '\0';
 777
 778                         if (S_ISDIR(st.st_mode)) {
 779                                 /* name is a directory */
 780                                 if (found[len1-1] != '/') {
 781                                         found[len1] = '/';
 782                                 }
 783                         } else {
 784                                 /* not put found file if search only dirs for cd */
 785                                 if (type == FIND_DIR_ONLY)
 786                                         goto cont;
 787                         }
 788                         /* Add it to the list */
 789                         add_match(found);
 790                         continue;
 791  cont:
 792                         free(found);
 793                 }
 794                 closedir(dir);
 795         }
 796         if (paths != path1) {
 797                 free(paths[0]); /* allocated memory is only in first member */
 798                 free(paths);
 799         }
 800 #undef dirbuf
 801 }
 802
 803 /* QUOT is used on elements of int_buf[], which are bytes,
 804  * not Unicode chars. Therefore it works correctly even in Unicode mode.
 805  */
 806 #define QUOT (UCHAR_MAX+1)
 807
 808 #define int_buf (S.find_match__int_buf)
 809 #define pos_buf (S.find_match__pos_buf)
 810 /* is must be <= in */
 811 static void collapse_pos(int is, int in)
 812 {
 813         memmove(int_buf+is, int_buf+in, (MAX_LINELEN+1-in)*sizeof(int_buf[0]));
 814         memmove(pos_buf+is, pos_buf+in, (MAX_LINELEN+1-in)*sizeof(pos_buf[0]));
 815 }
 816 static NOINLINE int find_match(char *matchBuf, int *len_with_quotes)
 817 {
 818         int i, j;
 819         int command_mode;
 820         int c, c2;
 821 /*      Were local, but it uses too much stack */
 822 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 823 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 824
 825         /* set to integer dimension characters and own positions */
 826         for (i = 0;; i++) {
 827                 int_buf[i] = (unsigned char)matchBuf[i];
 828                 if (int_buf[i] == 0) {
 829                         pos_buf[i] = -1; /* end-fo-line indicator */
 830                         break;
 831                 }
 832                 pos_buf[i] = i;
 833         }
 834
 835         /* mask \+symbol and convert '\t' to ' ' */
 836         for (i = j = 0; matchBuf[i]; i++, j++) {
 837                 if (matchBuf[i] == '\\') {
 838                         collapse_pos(j, j + 1);
 839                         int_buf[j] |= QUOT;
 840                         i++;
 841                 }
 842         }
 843         /* mask "symbols" or 'symbols' */
 844         c2 = 0;
 845         for (i = 0; int_buf[i]; i++) {
 846                 c = int_buf[i];
 847                 if (c == '\'' || c == '"') {
 848                         if (c2 == 0)
 849                                 c2 = c;
 850                         else {
 851                                 if (c == c2)
 852                                         c2 = 0;
 853                                 else
 854                                         int_buf[i] |= QUOT;
 855                         }
 856                 } else if (c2 != 0 && c != '$')
 857                         int_buf[i] |= QUOT;
 858         }
 859
 860         /* skip commands with arguments if line has commands delimiters */
 861         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 862         for (i = 0; int_buf[i]; i++) {
 863                 c = int_buf[i];
 864                 c2 = int_buf[i + 1];
 865                 j = i ? int_buf[i - 1] : -1;
 866                 command_mode = 0;
 867                 if (c == ';' || c == '&' || c == '|') {
 868                         command_mode = 1 + (c == c2);
 869                         if (c == '&') {
 870                                 if (j == '>' || j == '<')
 871                                         command_mode = 0;
 872                         } else if (c == '|' && j == '>')
 873                                 command_mode = 0;
 874                 }
 875                 if (command_mode) {
 876                         collapse_pos(0, i + command_mode);
 877                         i = -1;  /* hack incremet */
 878                 }
 879         }
 880         /* collapse `command...` */
 881         for (i = 0; int_buf[i]; i++) {
 882                 if (int_buf[i] == '`') {
 883                         for (j = i + 1; int_buf[j]; j++)
 884                                 if (int_buf[j] == '`') {
 885                                         collapse_pos(i, j + 1);
 886                                         j = 0;
 887                                         break;
 888                                 }
 889                         if (j) {
 890                                 /* not found closing ` - command mode, collapse all previous */
 891                                 collapse_pos(0, i + 1);
 892                                 break;
 893                         } else
 894                                 i--;  /* hack incremet */
 895                 }
 896         }
 897
 898         /* collapse (command...(command...)...) or {command...{command...}...} */
 899         c = 0;  /* "recursive" level */
 900         c2 = 0;
 901         for (i = 0; int_buf[i]; i++) {
 902                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 903                         if (int_buf[i] == '(')
 904                                 c++;
 905                         else
 906                                 c2++;
 907                         collapse_pos(0, i + 1);
 908                         i = -1;  /* hack incremet */
 909                 }
 910         }
 911         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) {
 912                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 913                         if (int_buf[i] == ')')
 914                                 c--;
 915                         else
 916                                 c2--;
 917                         collapse_pos(0, i + 1);
 918                         i = -1;  /* hack incremet */
 919                 }
 920         }
 921
 922         /* skip first not quote space */
 923         for (i = 0; int_buf[i]; i++)
 924                 if (int_buf[i] != ' ')
 925                         break;
 926         if (i)
 927                 collapse_pos(0, i);
 928
 929         /* set find mode for completion */
 930         command_mode = FIND_EXE_ONLY;
 931         for (i = 0; int_buf[i]; i++) {
 932                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 933                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 934                          && matchBuf[pos_buf[0]] == 'c'
 935                          && matchBuf[pos_buf[1]] == 'd'
 936                         ) {
 937                                 command_mode = FIND_DIR_ONLY;
 938                         } else {
 939                                 command_mode = FIND_FILE_ONLY;
 940                                 break;
 941                         }
 942                 }
 943         }
 944         for (i = 0; int_buf[i]; i++)
 945                 /* "strlen" */;
 946         /* find last word */
 947         for (--i; i >= 0; i--) {
 948                 c = int_buf[i];
 949                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 950                         collapse_pos(0, i + 1);
 951                         break;
 952                 }
 953         }
 954         /* skip first not quoted '\'' or '"' */
 955         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 956                 /*skip*/;
 957         /* collapse quote or unquote // or /~ */
 958         while ((int_buf[i] & ~QUOT) == '/'
 959          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 960         ) {
 961                 i++;
 962         }
 963
 964         /* set only match and destroy quotes */
 965         j = 0;
 966         for (c = 0; pos_buf[i] >= 0; i++) {
 967                 matchBuf[c++] = matchBuf[pos_buf[i]];
 968                 j = pos_buf[i] + 1;
 969         }
 970         matchBuf[c] = '\0';
 971         /* old length matchBuf with quotes symbols */
 972         *len_with_quotes = j ? j - pos_buf[0] : 0;
 973
 974         return command_mode;
 975 }
 976 #undef int_buf
 977 #undef pos_buf
 978
 979 /*
 980  * display by column (original idea from ls applet,
 981  * very optimized by me :)
 982  */
 983 static void showfiles(void)
 984 {
 985         int ncols, row;
 986         int column_width = 0;
 987         int nfiles = num_matches;
 988         int nrows = nfiles;
 989         int l;
 990
 991         /* find the longest file name - use that as the column width */
 992         for (row = 0; row < nrows; row++) {
 993                 l = unicode_strwidth(matches[row]);
 994                 if (column_width < l)
 995                         column_width = l;
 996         }
 997         column_width += 2;              /* min space for columns */
 998         ncols = cmdedit_termw / column_width;
 999
1000         if (ncols > 1) {
1001                 nrows /= ncols;
1002                 if (nfiles % ncols)
1003                         nrows++;        /* round up fractionals */
1004         } else {
1005                 ncols = 1;
1006         }
1007         for (row = 0; row < nrows; row++) {
1008                 int n = row;
1009                 int nc;
1010
1011                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
1012                         printf("%s%-*s", matches[n],
1013                                 (int)(column_width - unicode_strwidth(matches[n])), ""
1014                         );
1015                 }
1016                 if (ENABLE_UNICODE_SUPPORT)
1017                         puts(printable_string(NULL, matches[n]));
1018                 else
1019                         puts(matches[n]);
1020         }
1021 }
1022
1023 static char *add_quote_for_spec_chars(char *found)
1024 {
1025         int l = 0;
1026         char *s = xzalloc((strlen(found) + 1) * 2);
1027
1028         while (*found) {
1029                 if (strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", *found))
1030                         s[l++] = '\\';
1031                 s[l++] = *found++;
1032         }
1033         /* s[l] = '\0'; - already is */
1034         return s;
1035 }
1036
1037 /* Do TAB completion */
1038 static void input_tab(smallint *lastWasTab)
1039 {
1040         if (!(state->flags & TAB_COMPLETION))
1041                 return;
1042
1043         if (!*lastWasTab) {
1044                 char *tmp, *tmp1;
1045                 size_t len_found;
1046 /*              char matchBuf[MAX_LINELEN]; */
1047 #define matchBuf (S.input_tab__matchBuf)
1048                 int find_type;
1049                 int recalc_pos;
1050 #if ENABLE_UNICODE_SUPPORT
1051                 /* cursor pos in command converted to multibyte form */
1052                 int cursor_mb;
1053 #endif
1054
1055                 *lastWasTab = TRUE;             /* flop trigger */
1056
1057                 /* Make a local copy of the string --
1058                  * up to the position of the cursor */
1059                 save_string(matchBuf, cursor + 1);
1060 #if ENABLE_UNICODE_SUPPORT
1061                 cursor_mb = strlen(matchBuf);
1062 #endif
1063                 tmp = matchBuf;
1064
1065                 find_type = find_match(matchBuf, &recalc_pos);
1066
1067                 /* Free up any memory already allocated */
1068                 free_tab_completion_data();
1069
1070 #if ENABLE_FEATURE_USERNAME_COMPLETION
1071                 /* If the word starts with `~' and there is no slash in the word,
1072                  * then try completing this word as a username. */
1073                 if (state->flags & USERNAME_COMPLETION)
1074                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
1075                                 username_tab_completion(matchBuf, NULL);
1076 #endif
1077                 /* Try to match any executable in our path and everything
1078                  * in the current working directory */
1079                 if (!matches)
1080                         exe_n_cwd_tab_completion(matchBuf, find_type);
1081                 /* Sort, then remove any duplicates found */
1082                 if (matches) {
1083                         unsigned i;
1084                         int n = 0;
1085                         qsort_string_vector(matches, num_matches);
1086                         for (i = 0; i < num_matches - 1; ++i) {
1087                                 if (matches[i] && matches[i+1]) { /* paranoia */
1088                                         if (strcmp(matches[i], matches[i+1]) == 0) {
1089                                                 free(matches[i]);
1090                                                 matches[i] = NULL; /* paranoia */
1091                                         } else {
1092                                                 matches[n++] = matches[i];
1093                                         }
1094                                 }
1095                         }
1096                         matches[n] = matches[i];
1097                         num_matches = n + 1;
1098                 }
1099                 /* Did we find exactly one match? */
1100                 if (!matches || num_matches > 1) { /* no */
1101                         beep();
1102                         if (!matches)
1103                                 return;         /* not found */
1104                         /* find minimal match */
1105                         tmp1 = xstrdup(matches[0]);
1106                         for (tmp = tmp1; *tmp; tmp++) {
1107                                 for (len_found = 1; len_found < num_matches; len_found++) {
1108                                         if (matches[len_found][tmp - tmp1] != *tmp) {
1109                                                 *tmp = '\0';
1110                                                 break;
1111                                         }
1112                                 }
1113                         }
1114                         if (*tmp1 == '\0') {        /* have unique */
1115                                 free(tmp1);
1116                                 return;
1117                         }
1118                         tmp = add_quote_for_spec_chars(tmp1);
1119                         free(tmp1);
1120                 } else {                        /* one match */
1121                         tmp = add_quote_for_spec_chars(matches[0]);
1122                         /* for next completion current found */
1123                         *lastWasTab = FALSE;
1124
1125                         len_found = strlen(tmp);
1126                         if (tmp[len_found-1] != '/') {
1127                                 tmp[len_found] = ' ';
1128                                 tmp[len_found+1] = '\0';
1129                         }
1130                 }
1131
1132                 len_found = strlen(tmp);
1133 #if !ENABLE_UNICODE_SUPPORT
1134                 /* have space to place the match? */
1135                 /* The result consists of three parts with these lengths: */
1136                 /* (cursor - recalc_pos) + len_found + (command_len - cursor) */
1137                 /* it simplifies into: */
1138                 if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
1139                         /* save tail */
1140                         strcpy(matchBuf, command_ps + cursor);
1141                         /* add match and tail */
1142                         sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
1143                         command_len = strlen(command_ps);
1144                         /* new pos */
1145                         recalc_pos = cursor - recalc_pos + len_found;
1146                         /* write out the matched command */
1147                         redraw(cmdedit_y, command_len - recalc_pos);
1148                 }
1149 #else
1150                 {
1151                         char command[MAX_LINELEN];
1152                         int len = save_string(command, sizeof(command));
1153                         /* have space to place the match? */
1154                         /* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
1155                         if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
1156                                 /* save tail */
1157                                 strcpy(matchBuf, command + cursor_mb);
1158                                 /* where do we want to have cursor after all? */
1159                                 strcpy(&command[cursor_mb - recalc_pos], tmp);
1160                                 len = load_string(command, S.maxsize);
1161                                 /* add match and tail */
1162                                 sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
1163                                 command_len = load_string(command, S.maxsize);
1164                                 /* write out the matched command */
1165                                 redraw(cmdedit_y, command_len - len);
1166                         }
1167                 }
1168 #endif
1169                 free(tmp);
1170 #undef matchBuf
1171         } else {
1172                 /* Ok -- the last char was a TAB.  Since they
1173                  * just hit TAB again, print a list of all the
1174                  * available choices... */
1175                 if (matches && num_matches > 0) {
1176                         /* changed by goto_new_line() */
1177                         int sav_cursor = cursor;
1178
1179                         /* Go to the next line */
1180                         goto_new_line();
1181                         showfiles();
1182                         redraw(0, command_len - sav_cursor);
1183                 }
1184         }
1185 }
1186
1187 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
1188
1189
1190 line_input_t* FAST_FUNC new_line_input_t(int flags)
1191 {
1192         line_input_t *n = xzalloc(sizeof(*n));
1193         n->flags = flags;
1194         return n;
1195 }
1196
1197
1198 #if MAX_HISTORY > 0
1199
1200 static void save_command_ps_at_cur_history(void)
1201 {
1202         if (command_ps[0] != BB_NUL) {
1203                 int cur = state->cur_history;
1204                 free(state->history[cur]);
1205
1206 # if ENABLE_UNICODE_SUPPORT
1207                 {
1208                         char tbuf[MAX_LINELEN];
1209                         save_string(tbuf, sizeof(tbuf));
1210                         state->history[cur] = xstrdup(tbuf);
1211                 }
1212 # else
1213                 state->history[cur] = xstrdup(command_ps);
1214 # endif
1215         }
1216 }
1217
1218 /* state->flags is already checked to be nonzero */
1219 static int get_previous_history(void)
1220 {
1221         if ((state->flags & DO_HISTORY) && state->cur_history) {
1222                 save_command_ps_at_cur_history();
1223                 state->cur_history--;
1224                 return 1;
1225         }
1226         beep();
1227         return 0;
1228 }
1229
1230 static int get_next_history(void)
1231 {
1232         if (state->flags & DO_HISTORY) {
1233                 if (state->cur_history < state->cnt_history) {
1234                         save_command_ps_at_cur_history(); /* save the current history line */
1235                         return ++state->cur_history;
1236                 }
1237         }
1238         beep();
1239         return 0;
1240 }
1241
1242 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1243 /* We try to ensure that concurrent additions to the history
1244  * do not overwrite each other.
1245  * Otherwise shell users get unhappy.
1246  *
1247  * History file is trimmed lazily, when it grows several times longer
1248  * than configured MAX_HISTORY lines.
1249  */
1250
1251 static void free_line_input_t(line_input_t *n)
1252 {
1253         int i = n->cnt_history;
1254         while (i > 0)
1255                 free(n->history[--i]);
1256         free(n);
1257 }
1258
1259 /* state->flags is already checked to be nonzero */
1260 static void load_history(line_input_t *st_parm)
1261 {
1262         char *temp_h[MAX_HISTORY];
1263         char *line;
1264         FILE *fp;
1265         unsigned idx, i, line_len;
1266
1267         /* NB: do not trash old history if file can't be opened */
1268
1269         fp = fopen_for_read(st_parm->hist_file);
1270         if (fp) {
1271                 /* clean up old history */
1272                 for (idx = st_parm->cnt_history; idx > 0;) {
1273                         idx--;
1274                         free(st_parm->history[idx]);
1275                         st_parm->history[idx] = NULL;
1276                 }
1277
1278                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1279                 memset(temp_h, 0, sizeof(temp_h));
1280                 st_parm->cnt_history_in_file = idx = 0;
1281                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1282                         if (line[0] == '\0') {
1283                                 free(line);
1284                                 continue;
1285                         }
1286                         free(temp_h[idx]);
1287                         temp_h[idx] = line;
1288                         st_parm->cnt_history_in_file++;
1289                         idx++;
1290                         if (idx == MAX_HISTORY)
1291                                 idx = 0;
1292                 }
1293                 fclose(fp);
1294
1295                 /* find first non-NULL temp_h[], if any */
1296                 if (st_parm->cnt_history_in_file) {
1297                         while (temp_h[idx] == NULL) {
1298                                 idx++;
1299                                 if (idx == MAX_HISTORY)
1300                                         idx = 0;
1301                         }
1302                 }
1303
1304                 /* copy temp_h[] to st_parm->history[] */
1305                 for (i = 0; i < MAX_HISTORY;) {
1306                         line = temp_h[idx];
1307                         if (!line)
1308                                 break;
1309                         idx++;
1310                         if (idx == MAX_HISTORY)
1311                                 idx = 0;
1312                         line_len = strlen(line);
1313                         if (line_len >= MAX_LINELEN)
1314                                 line[MAX_LINELEN-1] = '\0';
1315                         st_parm->history[i++] = line;
1316                 }
1317                 st_parm->cnt_history = i;
1318         }
1319 }
1320
1321 /* state->flags is already checked to be nonzero */
1322 static void save_history(char *str)
1323 {
1324         int fd;
1325         int len, len2;
1326
1327         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0666);
1328         if (fd < 0)
1329                 return;
1330         xlseek(fd, 0, SEEK_END); /* paranoia */
1331         len = strlen(str);
1332         str[len] = '\n'; /* we (try to) do atomic write */
1333         len2 = full_write(fd, str, len + 1);
1334         str[len] = '\0';
1335         close(fd);
1336         if (len2 != len + 1)
1337                 return; /* "wtf?" */
1338
1339         /* did we write so much that history file needs trimming? */
1340         state->cnt_history_in_file++;
1341         if (state->cnt_history_in_file > MAX_HISTORY * 4) {
1342                 FILE *fp;
1343                 char *new_name;
1344                 line_input_t *st_temp;
1345                 int i;
1346
1347                 /* we may have concurrently written entries from others.
1348                  * load them */
1349                 st_temp = new_line_input_t(state->flags);
1350                 st_temp->hist_file = state->hist_file;
1351                 load_history(st_temp);
1352
1353                 /* write out temp file and replace hist_file atomically */
1354                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1355                 fp = fopen_for_write(new_name);
1356                 if (fp) {
1357                         for (i = 0; i < st_temp->cnt_history; i++)
1358                                 fprintf(fp, "%s\n", st_temp->history[i]);
1359                         fclose(fp);
1360                         if (rename(new_name, state->hist_file) == 0)
1361                                 state->cnt_history_in_file = st_temp->cnt_history;
1362                 }
1363                 free(new_name);
1364                 free_line_input_t(st_temp);
1365         }
1366 }
1367 # else
1368 #  define load_history(a) ((void)0)
1369 #  define save_history(a) ((void)0)
1370 # endif /* FEATURE_COMMAND_SAVEHISTORY */
1371
1372 static void remember_in_history(char *str)
1373 {
1374         int i;
1375
1376         if (!(state->flags & DO_HISTORY))
1377                 return;
1378         if (str[0] == '\0')
1379                 return;
1380         i = state->cnt_history;
1381         /* Don't save dupes */
1382         if (i && strcmp(state->history[i-1], str) == 0)
1383                 return;
1384
1385         free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1386         state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1387
1388         /* If history[] is full, remove the oldest command */
1389         /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1390         if (i >= MAX_HISTORY) {
1391                 free(state->history[0]);
1392                 for (i = 0; i < MAX_HISTORY-1; i++)
1393                         state->history[i] = state->history[i+1];
1394                 /* i == MAX_HISTORY-1 */
1395         }
1396         /* i <= MAX_HISTORY-1 */
1397         state->history[i++] = xstrdup(str);
1398         /* i <= MAX_HISTORY */
1399         state->cur_history = i;
1400         state->cnt_history = i;
1401 # if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
1402         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1403                 save_history(str);
1404 # endif
1405         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1406 }
1407
1408 #else /* MAX_HISTORY == 0 */
1409 # define remember_in_history(a) ((void)0)
1410 #endif /* MAX_HISTORY */
1411
1412
1413 #if ENABLE_FEATURE_EDITING_VI
1414 /*
1415  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1416  */
1417 static void
1418 vi_Word_motion(int eat)
1419 {
1420         CHAR_T *command = command_ps;
1421
1422         while (cursor < command_len && !BB_isspace(command[cursor]))
1423                 input_forward();
1424         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1425                 input_forward();
1426 }
1427
1428 static void
1429 vi_word_motion(int eat)
1430 {
1431         CHAR_T *command = command_ps;
1432
1433         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1434                 while (cursor < command_len
1435                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1436                 ) {
1437                         input_forward();
1438                 }
1439         } else if (BB_ispunct(command[cursor])) {
1440                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1441                         input_forward();
1442         }
1443
1444         if (cursor < command_len)
1445                 input_forward();
1446
1447         if (eat) {
1448                 while (cursor < command_len && BB_isspace(command[cursor]))
1449                         input_forward();
1450         }
1451 }
1452
1453 static void
1454 vi_End_motion(void)
1455 {
1456         CHAR_T *command = command_ps;
1457
1458         input_forward();
1459         while (cursor < command_len && BB_isspace(command[cursor]))
1460                 input_forward();
1461         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1462                 input_forward();
1463 }
1464
1465 static void
1466 vi_end_motion(void)
1467 {
1468         CHAR_T *command = command_ps;
1469
1470         if (cursor >= command_len-1)
1471                 return;
1472         input_forward();
1473         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1474                 input_forward();
1475         if (cursor >= command_len-1)
1476                 return;
1477         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1478                 while (cursor < command_len-1
1479                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1480                 ) {
1481                         input_forward();
1482                 }
1483         } else if (BB_ispunct(command[cursor])) {
1484                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1485                         input_forward();
1486         }
1487 }
1488
1489 static void
1490 vi_Back_motion(void)
1491 {
1492         CHAR_T *command = command_ps;
1493
1494         while (cursor > 0 && BB_isspace(command[cursor-1]))
1495                 input_backward(1);
1496         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1497                 input_backward(1);
1498 }
1499
1500 static void
1501 vi_back_motion(void)
1502 {
1503         CHAR_T *command = command_ps;
1504
1505         if (cursor <= 0)
1506                 return;
1507         input_backward(1);
1508         while (cursor > 0 && BB_isspace(command[cursor]))
1509                 input_backward(1);
1510         if (cursor <= 0)
1511                 return;
1512         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1513                 while (cursor > 0
1514                  && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1515                 ) {
1516                         input_backward(1);
1517                 }
1518         } else if (BB_ispunct(command[cursor])) {
1519                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1520                         input_backward(1);
1521         }
1522 }
1523 #endif
1524
1525 /* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1526 static void ctrl_left(void)
1527 {
1528         CHAR_T *command = command_ps;
1529
1530         while (1) {
1531                 CHAR_T c;
1532
1533                 input_backward(1);
1534                 if (cursor == 0)
1535                         break;
1536                 c = command[cursor];
1537                 if (c != ' ' && !BB_ispunct(c)) {
1538                         /* we reached a "word" delimited by spaces/punct.
1539                          * go to its beginning */
1540                         while (1) {
1541                                 c = command[cursor - 1];
1542                                 if (c == ' ' || BB_ispunct(c))
1543                                         break;
1544                                 input_backward(1);
1545                                 if (cursor == 0)
1546                                         break;
1547                         }
1548                         break;
1549                 }
1550         }
1551 }
1552 static void ctrl_right(void)
1553 {
1554         CHAR_T *command = command_ps;
1555
1556         while (1) {
1557                 CHAR_T c;
1558
1559                 c = command[cursor];
1560                 if (c == BB_NUL)
1561                         break;
1562                 if (c != ' ' && !BB_ispunct(c)) {
1563                         /* we reached a "word" delimited by spaces/punct.
1564                          * go to its end + 1 */
1565                         while (1) {
1566                                 input_forward();
1567                                 c = command[cursor];
1568                                 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1569                                         break;
1570                         }
1571                         break;
1572                 }
1573                 input_forward();
1574         }
1575 }
1576
1577
1578 /*
1579  * read_line_input and its helpers
1580  */
1581
1582 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1583 static void ask_terminal(void)
1584 {
1585         /* Ask terminal where is the cursor now.
1586          * lineedit_read_key handles response and corrects
1587          * our idea of current cursor position.
1588          * Testcase: run "echo -n long_line_long_line_long_line",
1589          * then type in a long, wrapping command and try to
1590          * delete it using backspace key.
1591          * Note: we print it _after_ prompt, because
1592          * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1593          */
1594         /* Problem: if there is buffered input on stdin,
1595          * the response will be delivered later,
1596          * possibly to an unsuspecting application.
1597          * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1598          * Result:
1599          * ~/srcdevel/bbox/fix/busybox.t4 #
1600          * ~/srcdevel/bbox/fix/busybox.t4 #
1601          * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
1602          * ~/srcdevel/bbox/fix/busybox.t4 #
1603          *
1604          * Checking for input with poll only makes the race narrower,
1605          * I still can trigger it. Strace:
1606          *
1607          * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1608          * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
1609          * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
1610          * poll([{fd=0, events=POLLIN}], 1, 4294967295) = 1 ([{fd=0, revents=POLLIN}])
1611          * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
1612          */
1613         struct pollfd pfd;
1614
1615         pfd.fd = STDIN_FILENO;
1616         pfd.events = POLLIN;
1617         if (safe_poll(&pfd, 1, 0) == 0) {
1618                 S.sent_ESC_br6n = 1;
1619                 fputs("\033" "[6n", stdout);
1620                 fflush_all(); /* make terminal see it ASAP! */
1621         }
1622 }
1623 #else
1624 #define ask_terminal() ((void)0)
1625 #endif
1626
1627 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1628 static void parse_and_put_prompt(const char *prmt_ptr)
1629 {
1630         cmdedit_prompt = prmt_ptr;
1631         cmdedit_prmt_len = strlen(prmt_ptr);
1632         put_prompt();
1633 }
1634 #else
1635 static void parse_and_put_prompt(const char *prmt_ptr)
1636 {
1637         int prmt_len = 0;
1638         size_t cur_prmt_len = 0;
1639         char flg_not_length = '[';
1640         char *prmt_mem_ptr = xzalloc(1);
1641         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1642         char cbuf[2];
1643         char c;
1644         char *pbuf;
1645
1646         cmdedit_prmt_len = 0;
1647
1648         if (!cwd_buf) {
1649                 cwd_buf = (char *)bb_msg_unknown;
1650         }
1651
1652         cbuf[1] = '\0'; /* never changes */
1653
1654         while (*prmt_ptr) {
1655                 char *free_me = NULL;
1656
1657                 pbuf = cbuf;
1658                 c = *prmt_ptr++;
1659                 if (c == '\\') {
1660                         const char *cp = prmt_ptr;
1661                         int l;
1662
1663                         c = bb_process_escape_sequence(&prmt_ptr);
1664                         if (prmt_ptr == cp) {
1665                                 if (*cp == '\0')
1666                                         break;
1667                                 c = *prmt_ptr++;
1668
1669                                 switch (c) {
1670 # if ENABLE_USERNAME_OR_HOMEDIR
1671                                 case 'u':
1672                                         pbuf = user_buf ? user_buf : (char*)"";
1673                                         break;
1674 # endif
1675                                 case 'h':
1676                                         pbuf = free_me = safe_gethostname();
1677                                         *strchrnul(pbuf, '.') = '\0';
1678                                         break;
1679                                 case '$':
1680                                         c = (geteuid() == 0 ? '#' : '$');
1681                                         break;
1682 # if ENABLE_USERNAME_OR_HOMEDIR
1683                                 case 'w':
1684                                         /* /home/user[/something] -> ~[/something] */
1685                                         pbuf = cwd_buf;
1686                                         l = strlen(home_pwd_buf);
1687                                         if (l != 0
1688                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1689                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1690                                          && strlen(cwd_buf + l) < PATH_MAX
1691                                         ) {
1692                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1693                                         }
1694                                         break;
1695 # endif
1696                                 case 'W':
1697                                         pbuf = cwd_buf;
1698                                         cp = strrchr(pbuf, '/');
1699                                         if (cp != NULL && cp != pbuf)
1700                                                 pbuf += (cp-pbuf) + 1;
1701                                         break;
1702                                 case '!':
1703                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1704                                         break;
1705                                 case 'e': case 'E':     /* \e \E = \033 */
1706                                         c = '\033';
1707                                         break;
1708                                 case 'x': case 'X': {
1709                                         char buf2[4];
1710                                         for (l = 0; l < 3;) {
1711                                                 unsigned h;
1712                                                 buf2[l++] = *prmt_ptr;
1713                                                 buf2[l] = '\0';
1714                                                 h = strtoul(buf2, &pbuf, 16);
1715                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1716                                                         buf2[--l] = '\0';
1717                                                         break;
1718                                                 }
1719                                                 prmt_ptr++;
1720                                         }
1721                                         c = (char)strtoul(buf2, NULL, 16);
1722                                         if (c == 0)
1723                                                 c = '?';
1724                                         pbuf = cbuf;
1725                                         break;
1726                                 }
1727                                 case '[': case ']':
1728                                         if (c == flg_not_length) {
1729                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1730                                                 continue;
1731                                         }
1732                                         break;
1733                                 } /* switch */
1734                         } /* if */
1735                 } /* if */
1736                 cbuf[0] = c;
1737                 cur_prmt_len = strlen(pbuf);
1738                 prmt_len += cur_prmt_len;
1739                 if (flg_not_length != ']')
1740                         cmdedit_prmt_len += cur_prmt_len;
1741                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1742                 free(free_me);
1743         } /* while */
1744
1745         if (cwd_buf != (char *)bb_msg_unknown)
1746                 free(cwd_buf);
1747         cmdedit_prompt = prmt_mem_ptr;
1748         put_prompt();
1749 }
1750 #endif
1751
1752 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1753 {
1754         cmdedit_termw = w;
1755         if (redraw_flg) {
1756                 /* new y for current cursor */
1757                 int new_y = (cursor + cmdedit_prmt_len) / w;
1758                 /* redraw */
1759                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1760                 fflush_all();
1761         }
1762 }
1763
1764 static void win_changed(int nsig)
1765 {
1766         int sv_errno = errno;
1767         unsigned width;
1768         get_terminal_width_height(0, &width, NULL);
1769         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1770         if (nsig == SIGWINCH)
1771                 signal(SIGWINCH, win_changed); /* rearm ourself */
1772         errno = sv_errno;
1773 }
1774
1775 static int lineedit_read_key(char *read_key_buffer)
1776 {
1777         int64_t ic;
1778         int timeout = -1;
1779 #if ENABLE_UNICODE_SUPPORT
1780         char unicode_buf[MB_CUR_MAX + 1];
1781         int unicode_idx = 0;
1782 #endif
1783
1784         while (1) {
1785                 /* Wait for input. TIMEOUT = -1 makes read_key wait even
1786                  * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
1787                  * insist on full MB_CUR_MAX buffer to declare input like
1788                  * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
1789                  *
1790                  * Note: read_key sets errno to 0 on success.
1791                  */
1792                 ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
1793                 if (errno) {
1794 #if ENABLE_UNICODE_SUPPORT
1795                         if (errno == EAGAIN && unicode_idx != 0)
1796                                 goto pushback;
1797 #endif
1798                         break;
1799                 }
1800
1801 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1802                 if ((int32_t)ic == KEYCODE_CURSOR_POS
1803                  && S.sent_ESC_br6n
1804                 ) {
1805                         S.sent_ESC_br6n = 0;
1806                         if (cursor == 0) { /* otherwise it may be bogus */
1807                                 int col = ((ic >> 32) & 0x7fff) - 1;
1808                                 if (col > cmdedit_prmt_len) {
1809                                         cmdedit_x += (col - cmdedit_prmt_len);
1810                                         while (cmdedit_x >= cmdedit_termw) {
1811                                                 cmdedit_x -= cmdedit_termw;
1812                                                 cmdedit_y++;
1813                                         }
1814                                 }
1815                         }
1816                         continue;
1817                 }
1818 #endif
1819
1820 #if ENABLE_UNICODE_SUPPORT
1821                 if (unicode_status == UNICODE_ON) {
1822                         wchar_t wc;
1823
1824                         if ((int32_t)ic < 0) /* KEYCODE_xxx */
1825                                 break;
1826                         // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
1827
1828                         unicode_buf[unicode_idx++] = ic;
1829                         unicode_buf[unicode_idx] = '\0';
1830                         if (mbstowcs(&wc, unicode_buf, 1) != 1) {
1831                                 /* Not (yet?) a valid unicode char */
1832                                 if (unicode_idx < MB_CUR_MAX) {
1833                                         timeout = 50;
1834                                         continue;
1835                                 }
1836  pushback:
1837                                 /* Invalid sequence. Save all "bad bytes" except first */
1838                                 read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
1839 # if !ENABLE_UNICODE_PRESERVE_BROKEN
1840                                 ic = CONFIG_SUBST_WCHAR;
1841 # else
1842                                 ic = unicode_mark_raw_byte(unicode_buf[0]);
1843 # endif
1844                         } else {
1845                                 /* Valid unicode char, return its code */
1846                                 ic = wc;
1847                         }
1848                 }
1849 #endif
1850                 break;
1851         }
1852
1853         return ic;
1854 }
1855
1856 #if ENABLE_UNICODE_BIDI_SUPPORT
1857 static int isrtl_str(void)
1858 {
1859         int idx = cursor;
1860
1861         while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
1862                 idx++;
1863         return unicode_bidi_isrtl(command_ps[idx]);
1864 }
1865 #else
1866 # define isrtl_str() 0
1867 #endif
1868
1869 /* leave out the "vi-mode"-only case labels if vi editing isn't
1870  * configured. */
1871 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
1872
1873 /* convert uppercase ascii to equivalent control char, for readability */
1874 #undef CTRL
1875 #define CTRL(a) ((a) & ~0x40)
1876
1877 /* maxsize must be >= 2.
1878  * Returns:
1879  * -1 on read errors or EOF, or on bare Ctrl-D,
1880  * 0  on ctrl-C (the line entered is still returned in 'command'),
1881  * >0 length of input string, including terminating '\n'
1882  */
1883 int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1884 {
1885         int len;
1886 #if ENABLE_FEATURE_TAB_COMPLETION
1887         smallint lastWasTab = FALSE;
1888 #endif
1889         smallint break_out = 0;
1890 #if ENABLE_FEATURE_EDITING_VI
1891         smallint vi_cmdmode = 0;
1892 #endif
1893         struct termios initial_settings;
1894         struct termios new_settings;
1895         char read_key_buffer[KEYCODE_BUFFER_SIZE];
1896
1897         INIT_S();
1898
1899         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1900          || !(initial_settings.c_lflag & ECHO)
1901         ) {
1902                 /* Happens when e.g. stty -echo was run before */
1903                 parse_and_put_prompt(prompt);
1904                 /* fflush_all(); - done by parse_and_put_prompt */
1905                 if (fgets(command, maxsize, stdin) == NULL)
1906                         len = -1; /* EOF or error */
1907                 else
1908                         len = strlen(command);
1909                 DEINIT_S();
1910                 return len;
1911         }
1912
1913         init_unicode();
1914
1915 // FIXME: audit & improve this
1916         if (maxsize > MAX_LINELEN)
1917                 maxsize = MAX_LINELEN;
1918         S.maxsize = maxsize;
1919
1920         /* With null flags, no other fields are ever used */
1921         state = st ? st : (line_input_t*) &const_int_0;
1922 #if MAX_HISTORY > 0
1923 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1924         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1925                 if (state->cnt_history == 0)
1926                         load_history(state);
1927 # endif
1928         if (state->flags & DO_HISTORY)
1929                 state->cur_history = state->cnt_history;
1930 #endif
1931
1932         /* prepare before init handlers */
1933         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1934         command_len = 0;
1935 #if ENABLE_UNICODE_SUPPORT
1936         command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
1937 #else
1938         command_ps = command;
1939         command[0] = '\0';
1940 #endif
1941 #define command command_must_not_be_used
1942
1943         new_settings = initial_settings;
1944         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1945         /* Turn off echoing and CTRL-C, so we can trap it */
1946         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1947         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1948         new_settings.c_cc[VMIN] = 1;
1949         new_settings.c_cc[VTIME] = 0;
1950         /* Turn off CTRL-C, so we can trap it */
1951 #ifndef _POSIX_VDISABLE
1952 # define _POSIX_VDISABLE '\0'
1953 #endif
1954         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1955         tcsetattr_stdin_TCSANOW(&new_settings);
1956
1957         /* Now initialize things */
1958         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1959         win_changed(0); /* do initial resizing */
1960 #if ENABLE_USERNAME_OR_HOMEDIR
1961         {
1962                 struct passwd *entry;
1963
1964                 entry = getpwuid(geteuid());
1965                 if (entry) {
1966                         user_buf = xstrdup(entry->pw_name);
1967                         home_pwd_buf = xstrdup(entry->pw_dir);
1968                 }
1969         }
1970 #endif
1971
1972 #if 0
1973         for (i = 0; i <= MAX_HISTORY; i++)
1974                 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
1975         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
1976 #endif
1977
1978         /* Print out the command prompt, optionally ask where cursor is */
1979         parse_and_put_prompt(prompt);
1980         ask_terminal();
1981
1982         read_key_buffer[0] = 0;
1983         while (1) {
1984                 /*
1985                  * The emacs and vi modes share much of the code in the big
1986                  * command loop.  Commands entered when in vi's command mode
1987                  * (aka "escape mode") get an extra bit added to distinguish
1988                  * them - this keeps them from being self-inserted. This
1989                  * clutters the big switch a bit, but keeps all the code
1990                  * in one place.
1991                  */
1992                 enum {
1993                         VI_CMDMODE_BIT = 0x40000000,
1994                         /* 0x80000000 bit flags KEYCODE_xxx */
1995                 };
1996                 int32_t ic, ic_raw;
1997
1998                 fflush_all();
1999                 ic = ic_raw = lineedit_read_key(read_key_buffer);
2000
2001 #if ENABLE_FEATURE_EDITING_VI
2002                 newdelflag = 1;
2003                 if (vi_cmdmode) {
2004                         /* btw, since KEYCODE_xxx are all < 0, this doesn't
2005                          * change ic if it contains one of them: */
2006                         ic |= VI_CMDMODE_BIT;
2007                 }
2008 #endif
2009
2010                 switch (ic) {
2011                 case '\n':
2012                 case '\r':
2013                 vi_case('\n'|VI_CMDMODE_BIT:)
2014                 vi_case('\r'|VI_CMDMODE_BIT:)
2015                         /* Enter */
2016                         goto_new_line();
2017                         break_out = 1;
2018                         break;
2019                 case CTRL('A'):
2020                 vi_case('0'|VI_CMDMODE_BIT:)
2021                         /* Control-a -- Beginning of line */
2022                         input_backward(cursor);
2023                         break;
2024                 case CTRL('B'):
2025                 vi_case('h'|VI_CMDMODE_BIT:)
2026                 vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
2027                 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
2028                         input_backward(1); /* Move back one character */
2029                         break;
2030                 case CTRL('E'):
2031                 vi_case('$'|VI_CMDMODE_BIT:)
2032                         /* Control-e -- End of line */
2033                         put_till_end_and_adv_cursor();
2034                         break;
2035                 case CTRL('F'):
2036                 vi_case('l'|VI_CMDMODE_BIT:)
2037                 vi_case(' '|VI_CMDMODE_BIT:)
2038                         input_forward(); /* Move forward one character */
2039                         break;
2040                 case '\b':   /* ^H */
2041                 case '\x7f': /* DEL */
2042                         if (!isrtl_str())
2043                                 input_backspace();
2044                         else
2045                                 input_delete(0);
2046                         break;
2047                 case KEYCODE_DELETE:
2048                         if (!isrtl_str())
2049                                 input_delete(0);
2050                         else
2051                                 input_backspace();
2052                         break;
2053 #if ENABLE_FEATURE_TAB_COMPLETION
2054                 case '\t':
2055                         input_tab(&lastWasTab);
2056                         break;
2057 #endif
2058                 case CTRL('K'):
2059                         /* Control-k -- clear to end of line */
2060                         command_ps[cursor] = BB_NUL;
2061                         command_len = cursor;
2062                         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
2063                         break;
2064                 case CTRL('L'):
2065                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
2066                         /* Control-l -- clear screen */
2067                         printf("\033[H"); /* cursor to top,left */
2068                         redraw(0, command_len - cursor);
2069                         break;
2070 #if MAX_HISTORY > 0
2071                 case CTRL('N'):
2072                 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
2073                 vi_case('j'|VI_CMDMODE_BIT:)
2074                         /* Control-n -- Get next command in history */
2075                         if (get_next_history())
2076                                 goto rewrite_line;
2077                         break;
2078                 case CTRL('P'):
2079                 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
2080                 vi_case('k'|VI_CMDMODE_BIT:)
2081                         /* Control-p -- Get previous command from history */
2082                         if (get_previous_history())
2083                                 goto rewrite_line;
2084                         break;
2085 #endif
2086                 case CTRL('U'):
2087                 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
2088                         /* Control-U -- Clear line before cursor */
2089                         if (cursor) {
2090                                 command_len -= cursor;
2091                                 memmove(command_ps, command_ps + cursor,
2092                                         (command_len + 1) * sizeof(command_ps[0]));
2093                                 redraw(cmdedit_y, command_len);
2094                         }
2095                         break;
2096                 case CTRL('W'):
2097                 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
2098                         /* Control-W -- Remove the last word */
2099                         while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
2100                                 input_backspace();
2101                         while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
2102                                 input_backspace();
2103                         break;
2104
2105 #if ENABLE_FEATURE_EDITING_VI
2106                 case 'i'|VI_CMDMODE_BIT:
2107                         vi_cmdmode = 0;
2108                         break;
2109                 case 'I'|VI_CMDMODE_BIT:
2110                         input_backward(cursor);
2111                         vi_cmdmode = 0;
2112                         break;
2113                 case 'a'|VI_CMDMODE_BIT:
2114                         input_forward();
2115                         vi_cmdmode = 0;
2116                         break;
2117                 case 'A'|VI_CMDMODE_BIT:
2118                         put_till_end_and_adv_cursor();
2119                         vi_cmdmode = 0;
2120                         break;
2121                 case 'x'|VI_CMDMODE_BIT:
2122                         input_delete(1);
2123                         break;
2124                 case 'X'|VI_CMDMODE_BIT:
2125                         if (cursor > 0) {
2126                                 input_backward(1);
2127                                 input_delete(1);
2128                         }
2129                         break;
2130                 case 'W'|VI_CMDMODE_BIT:
2131                         vi_Word_motion(1);
2132                         break;
2133                 case 'w'|VI_CMDMODE_BIT:
2134                         vi_word_motion(1);
2135                         break;
2136                 case 'E'|VI_CMDMODE_BIT:
2137                         vi_End_motion();
2138                         break;
2139                 case 'e'|VI_CMDMODE_BIT:
2140                         vi_end_motion();
2141                         break;
2142                 case 'B'|VI_CMDMODE_BIT:
2143                         vi_Back_motion();
2144                         break;
2145                 case 'b'|VI_CMDMODE_BIT:
2146                         vi_back_motion();
2147                         break;
2148                 case 'C'|VI_CMDMODE_BIT:
2149                         vi_cmdmode = 0;
2150                         /* fall through */
2151                 case 'D'|VI_CMDMODE_BIT:
2152                         goto clear_to_eol;
2153
2154                 case 'c'|VI_CMDMODE_BIT:
2155                         vi_cmdmode = 0;
2156                         /* fall through */
2157                 case 'd'|VI_CMDMODE_BIT: {
2158                         int nc, sc;
2159
2160                         ic = lineedit_read_key(read_key_buffer);
2161                         if (errno) /* error */
2162                                 goto prepare_to_die;
2163                         if (ic == ic_raw) { /* "cc", "dd" */
2164                                 input_backward(cursor);
2165                                 goto clear_to_eol;
2166                                 break;
2167                         }
2168
2169                         sc = cursor;
2170                         switch (ic) {
2171                         case 'w':
2172                         case 'W':
2173                         case 'e':
2174                         case 'E':
2175                                 switch (ic) {
2176                                 case 'w':   /* "dw", "cw" */
2177                                         vi_word_motion(vi_cmdmode);
2178                                         break;
2179                                 case 'W':   /* 'dW', 'cW' */
2180                                         vi_Word_motion(vi_cmdmode);
2181                                         break;
2182                                 case 'e':   /* 'de', 'ce' */
2183                                         vi_end_motion();
2184                                         input_forward();
2185                                         break;
2186                                 case 'E':   /* 'dE', 'cE' */
2187                                         vi_End_motion();
2188                                         input_forward();
2189                                         break;
2190                                 }
2191                                 nc = cursor;
2192                                 input_backward(cursor - sc);
2193                                 while (nc-- > cursor)
2194                                         input_delete(1);
2195                                 break;
2196                         case 'b':  /* "db", "cb" */
2197                         case 'B':  /* implemented as B */
2198                                 if (ic == 'b')
2199                                         vi_back_motion();
2200                                 else
2201                                         vi_Back_motion();
2202                                 while (sc-- > cursor)
2203                                         input_delete(1);
2204                                 break;
2205                         case ' ':  /* "d ", "c " */
2206                                 input_delete(1);
2207                                 break;
2208                         case '$':  /* "d$", "c$" */
2209  clear_to_eol:
2210                                 while (cursor < command_len)
2211                                         input_delete(1);
2212                                 break;
2213                         }
2214                         break;
2215                 }
2216                 case 'p'|VI_CMDMODE_BIT:
2217                         input_forward();
2218                         /* fallthrough */
2219                 case 'P'|VI_CMDMODE_BIT:
2220                         put();
2221                         break;
2222                 case 'r'|VI_CMDMODE_BIT:
2223 //FIXME: unicode case?
2224                         ic = lineedit_read_key(read_key_buffer);
2225                         if (errno) /* error */
2226                                 goto prepare_to_die;
2227                         if (ic < ' ' || ic > 255) {
2228                                 beep();
2229                         } else {
2230                                 command_ps[cursor] = ic;
2231                                 bb_putchar(ic);
2232                                 bb_putchar('\b');
2233                         }
2234                         break;
2235                 case '\x1b': /* ESC */
2236                         if (state->flags & VI_MODE) {
2237                                 /* insert mode --> command mode */
2238                                 vi_cmdmode = 1;
2239                                 input_backward(1);
2240                         }
2241                         break;
2242 #endif /* FEATURE_COMMAND_EDITING_VI */
2243
2244 #if MAX_HISTORY > 0
2245                 case KEYCODE_UP:
2246                         if (get_previous_history())
2247                                 goto rewrite_line;
2248                         beep();
2249                         break;
2250                 case KEYCODE_DOWN:
2251                         if (!get_next_history())
2252                                 break;
2253  rewrite_line:
2254                         /* Rewrite the line with the selected history item */
2255                         /* change command */
2256                         command_len = load_string(state->history[state->cur_history] ?
2257                                         state->history[state->cur_history] : "", maxsize);
2258                         /* redraw and go to eol (bol, in vi) */
2259                         redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2260                         break;
2261 #endif
2262                 case KEYCODE_RIGHT:
2263                         input_forward();
2264                         break;
2265                 case KEYCODE_LEFT:
2266                         input_backward(1);
2267                         break;
2268                 case KEYCODE_CTRL_LEFT:
2269                         ctrl_left();
2270                         break;
2271                 case KEYCODE_CTRL_RIGHT:
2272                         ctrl_right();
2273                         break;
2274                 case KEYCODE_HOME:
2275                         input_backward(cursor);
2276                         break;
2277                 case KEYCODE_END:
2278                         put_till_end_and_adv_cursor();
2279                         break;
2280
2281                 default:
2282                         if (initial_settings.c_cc[VINTR] != 0
2283                          && ic_raw == initial_settings.c_cc[VINTR]
2284                         ) {
2285                                 /* Ctrl-C (usually) - stop gathering input */
2286                                 goto_new_line();
2287                                 command_len = 0;
2288                                 break_out = -1; /* "do not append '\n'" */
2289                                 break;
2290                         }
2291                         if (initial_settings.c_cc[VEOF] != 0
2292                          && ic_raw == initial_settings.c_cc[VEOF]
2293                         ) {
2294                                 /* Ctrl-D (usually) - delete one character,
2295                                  * or exit if len=0 and no chars to delete */
2296                                 if (command_len == 0) {
2297                                         errno = 0;
2298 #if ENABLE_FEATURE_EDITING_VI
2299  prepare_to_die:
2300 #endif
2301                                         break_out = command_len = -1;
2302                                         break;
2303                                 }
2304                                 input_delete(0);
2305                                 break;
2306                         }
2307 //                      /* Control-V -- force insert of next char */
2308 //                      if (c == CTRL('V')) {
2309 //                              if (safe_read(STDIN_FILENO, &c, 1) < 1)
2310 //                                      goto prepare_to_die;
2311 //                              if (c == 0) {
2312 //                                      beep();
2313 //                                      break;
2314 //                              }
2315 //                      }
2316                         if (ic < ' '
2317                          || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2318                          || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2319                         ) {
2320                                 /* If VI_CMDMODE_BIT is set, ic is >= 256
2321                                  * and vi mode ignores unexpected chars.
2322                                  * Otherwise, we are here if ic is a
2323                                  * control char or an unhandled ESC sequence,
2324                                  * which is also ignored.
2325                                  */
2326                                 break;
2327                         }
2328                         if ((int)command_len >= (maxsize - 2)) {
2329                                 /* Not enough space for the char and EOL */
2330                                 break;
2331                         }
2332
2333                         command_len++;
2334                         if (cursor == (command_len - 1)) {
2335                                 /* We are at the end, append */
2336                                 command_ps[cursor] = ic;
2337                                 command_ps[cursor + 1] = BB_NUL;
2338                                 put_cur_glyph_and_inc_cursor();
2339                                 if (unicode_bidi_isrtl(ic))
2340                                         input_backward(1);
2341                         } else {
2342                                 /* In the middle, insert */
2343                                 int sc = cursor;
2344
2345                                 memmove(command_ps + sc + 1, command_ps + sc,
2346                                         (command_len - sc) * sizeof(command_ps[0]));
2347                                 command_ps[sc] = ic;
2348                                 /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
2349                                 if (!isrtl_str())
2350                                         sc++; /* no */
2351                                 put_till_end_and_adv_cursor();
2352                                 /* to prev x pos + 1 */
2353                                 input_backward(cursor - sc);
2354                         }
2355                         break;
2356                 } /* switch (ic) */
2357
2358                 if (break_out)
2359                         break;
2360
2361 #if ENABLE_FEATURE_TAB_COMPLETION
2362                 if (ic_raw != '\t')
2363                         lastWasTab = FALSE;
2364 #endif
2365         } /* while (1) */
2366
2367 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2368         if (S.sent_ESC_br6n) {
2369                 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2370                  * We sent "ESC [ 6 n", but got '\n' first, and
2371                  * KEYCODE_CURSOR_POS response is now buffered from terminal.
2372                  * It's bad already and not much can be done with it
2373                  * (it _will_ be visible for the next process to read stdin),
2374                  * but without this delay it even shows up on the screen
2375                  * as garbage because we restore echo settings with tcsetattr
2376                  * before it comes in. UGLY!
2377                  */
2378                 usleep(20*1000);
2379         }
2380 #endif
2381
2382 /* End of bug-catching "command_must_not_be_used" trick */
2383 #undef command
2384
2385 #if ENABLE_UNICODE_SUPPORT
2386         command[0] = '\0';
2387         if (command_len > 0)
2388                 command_len = save_string(command, maxsize - 1);
2389         free(command_ps);
2390 #endif
2391
2392         if (command_len > 0)
2393                 remember_in_history(command);
2394
2395         if (break_out > 0) {
2396                 command[command_len++] = '\n';
2397                 command[command_len] = '\0';
2398         }
2399
2400 #if ENABLE_FEATURE_TAB_COMPLETION
2401         free_tab_completion_data();
2402 #endif
2403
2404         /* restore initial_settings */
2405         tcsetattr_stdin_TCSANOW(&initial_settings);
2406         /* restore SIGWINCH handler */
2407         signal(SIGWINCH, previous_SIGWINCH_handler);
2408         fflush_all();
2409
2410         len = command_len;
2411         DEINIT_S();
2412
2413         return len; /* can't return command_len, DEINIT_S() destroys it */
2414 }
2415
2416 #else  /* !FEATURE_EDITING */
2417
2418 #undef read_line_input
2419 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2420 {
2421         fputs(prompt, stdout);
2422         fflush_all();
2423         fgets(command, maxsize, stdin);
2424         return strlen(command);
2425 }
2426
2427 #endif  /* !FEATURE_EDITING */
2428
2429
2430 /*
2431  * Testing
2432  */
2433
2434 #ifdef TEST
2435
2436 #include <locale.h>
2437
2438 const char *applet_name = "debug stuff usage";
2439
2440 int main(int argc, char **argv)
2441 {
2442         char buff[MAX_LINELEN];
2443         char *prompt =
2444 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2445                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2446                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2447                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2448 #else
2449                 "% ";
2450 #endif
2451
2452         while (1) {
2453                 int l;
2454                 l = read_line_input(prompt, buff);
2455                 if (l <= 0 || buff[l-1] != '\n')
2456                         break;
2457                 buff[l-1] = 0;
2458                 printf("*** read_line_input() returned line =%s=\n", buff);
2459         }
2460         printf("*** read_line_input() detect ^D\n");
2461         return 0;
2462 }
2463
2464 #endif  /* TEST */