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_FEATURE_GETUSERNAME_AND_HOMEDIR \
  57         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  58 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
  59 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  60 #undef IF_FEATURE_GETUSERNAME_AND_HOMEDIR
  61 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
  62 #endif
  63
  64
  65 #define SEQ_CLEAR_TILL_END_OF_SCREEN "\033[J"
  66 //#define SEQ_CLEAR_TILL_END_OF_LINE   "\033[K"
  67
  68
  69 #undef CHAR_T
  70 #if ENABLE_UNICODE_SUPPORT
  71 # define BB_NUL ((wchar_t)0)
  72 # define CHAR_T wchar_t
  73 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
  74 # if ENABLE_FEATURE_EDITING_VI
  75 static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
  76 # endif
  77 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
  78 # undef isspace
  79 # undef isalnum
  80 # undef ispunct
  81 # undef isprint
  82 # define isspace isspace_must_not_be_used
  83 # define isalnum isalnum_must_not_be_used
  84 # define ispunct ispunct_must_not_be_used
  85 # define isprint isprint_must_not_be_used
  86 #else
  87 # define BB_NUL '\0'
  88 # define CHAR_T char
  89 # define BB_isspace(c) isspace(c)
  90 # define BB_isalnum(c) isalnum(c)
  91 # define BB_ispunct(c) ispunct(c)
  92 #endif
  93
  94
  95 # if ENABLE_UNICODE_PRESERVE_BROKEN
  96 #  define unicode_mark_raw_byte(wc)   ((wc) | 0x20000000)
  97 #  define unicode_is_raw_byte(wc)     ((wc) & 0x20000000)
  98 # else
  99 #  define unicode_is_raw_byte(wc)     0
 100 # endif
 101
 102
 103 enum {
 104         /* We use int16_t for positions, need to limit line len */
 105         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
 106                       ? CONFIG_FEATURE_EDITING_MAX_LEN
 107                       : 0x7ff0
 108 };
 109
 110 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 111 static const char null_str[] ALIGN1 = "";
 112 #endif
 113
 114 /* We try to minimize both static and stack usage. */
 115 struct lineedit_statics {
 116         line_input_t *state;
 117
 118         volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
 119         sighandler_t previous_SIGWINCH_handler;
 120
 121         unsigned cmdedit_x;        /* real x (col) terminal position */
 122         unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
 123         unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
 124
 125         unsigned cursor;
 126         int command_len; /* must be signed */
 127         /* signed maxsize: we want x in "if (x > S.maxsize)"
 128          * to _not_ be promoted to unsigned */
 129         int maxsize;
 130         CHAR_T *command_ps;
 131
 132         const char *cmdedit_prompt;
 133 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 134         int num_ok_lines; /* = 1; */
 135 #endif
 136
 137 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 138         char *user_buf;
 139         char *home_pwd_buf; /* = (char*)null_str; */
 140 #endif
 141
 142 #if ENABLE_FEATURE_TAB_COMPLETION
 143         char **matches;
 144         unsigned num_matches;
 145 #endif
 146
 147 #if ENABLE_FEATURE_EDITING_VI
 148 #define DELBUFSIZ 128
 149         CHAR_T *delptr;
 150         smallint newdelflag;     /* whether delbuf should be reused yet */
 151         CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 152 #endif
 153 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 154         smallint sent_ESC_br6n;
 155 #endif
 156
 157         /* Formerly these were big buffers on stack: */
 158 #if ENABLE_FEATURE_TAB_COMPLETION
 159         char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
 160         char input_tab__matchBuf[MAX_LINELEN];
 161         int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
 162         int16_t find_match__pos_buf[MAX_LINELEN + 1];
 163 #endif
 164 };
 165
 166 /* See lineedit_ptr_hack.c */
 167 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 168
 169 #define S (*lineedit_ptr_to_statics)
 170 #define state            (S.state           )
 171 #define cmdedit_termw    (S.cmdedit_termw   )
 172 #define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
 173 #define cmdedit_x        (S.cmdedit_x       )
 174 #define cmdedit_y        (S.cmdedit_y       )
 175 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 176 #define cursor           (S.cursor          )
 177 #define command_len      (S.command_len     )
 178 #define command_ps       (S.command_ps      )
 179 #define cmdedit_prompt   (S.cmdedit_prompt  )
 180 #define num_ok_lines     (S.num_ok_lines    )
 181 #define user_buf         (S.user_buf        )
 182 #define home_pwd_buf     (S.home_pwd_buf    )
 183 #define matches          (S.matches         )
 184 #define num_matches      (S.num_matches     )
 185 #define delptr           (S.delptr          )
 186 #define newdelflag       (S.newdelflag      )
 187 #define delbuf           (S.delbuf          )
 188
 189 #define INIT_S() do { \
 190         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 191         barrier(); \
 192         cmdedit_termw = 80; \
 193         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
 194         IF_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 195 } while (0)
 196 static void deinit_S(void)
 197 {
 198 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 199         /* This one is allocated only if FANCY_PROMPT is on
 200          * (otherwise it points to verbatim prompt (NOT malloced) */
 201         free((char*)cmdedit_prompt);
 202 #endif
 203 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 204         free(user_buf);
 205         if (home_pwd_buf != null_str)
 206                 free(home_pwd_buf);
 207 #endif
 208         free(lineedit_ptr_to_statics);
 209 }
 210 #define DEINIT_S() deinit_S()
 211
 212
 213 #if ENABLE_UNICODE_SUPPORT
 214 static size_t load_string(const char *src, int maxsize)
 215 {
 216         ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
 217         if (len < 0)
 218                 len = 0;
 219         command_ps[len] = 0;
 220         return len;
 221 }
 222 static unsigned save_string(char *dst, unsigned maxsize)
 223 {
 224 # if !ENABLE_UNICODE_PRESERVE_BROKEN
 225         ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
 226         if (len < 0)
 227                 len = 0;
 228         dst[len] = '\0';
 229         return len;
 230 # else
 231         unsigned dstpos = 0;
 232         unsigned srcpos = 0;
 233
 234         maxsize--;
 235         while (dstpos < maxsize) {
 236                 wchar_t wc;
 237                 int n = srcpos;
 238                 while ((wc = command_ps[srcpos]) != 0
 239                     && !unicode_is_raw_byte(wc)
 240                 ) {
 241                         srcpos++;
 242                 }
 243                 command_ps[srcpos] = 0;
 244                 n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
 245                 if (n < 0) /* should not happen */
 246                         break;
 247                 dstpos += n;
 248                 if (wc == 0) /* usually is */
 249                         break;
 250                 /* We do have invalid byte here! */
 251                 command_ps[srcpos] = wc; /* restore it */
 252                 srcpos++;
 253                 if (dstpos == maxsize)
 254                         break;
 255                 dst[dstpos++] = (char) wc;
 256         }
 257         dst[dstpos] = '\0';
 258         return dstpos;
 259 # endif
 260 }
 261 /* I thought just fputwc(c, stdout) would work. But no... */
 262 static void BB_PUTCHAR(wchar_t c)
 263 {
 264         char buf[MB_CUR_MAX + 1];
 265         mbstate_t mbst = { 0 };
 266         ssize_t len;
 267
 268         len = wcrtomb(buf, c, &mbst);
 269         if (len > 0) {
 270                 buf[len] = '\0';
 271                 fputs(buf, stdout);
 272         }
 273 }
 274 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
 275 static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
 276 # else
 277 static wchar_t adjust_width_and_validate_wc(wchar_t wc)
 278 #  define adjust_width_and_validate_wc(width_adj, wc) \
 279         ((*(width_adj))++, adjust_width_and_validate_wc(wc))
 280 # endif
 281 {
 282         int w = 1;
 283
 284         if (unicode_status == UNICODE_ON) {
 285                 if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
 286                         /* note: also true for unicode_is_raw_byte(wc) */
 287                         goto subst;
 288                 }
 289                 w = wcwidth(wc);
 290                 if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
 291                  || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
 292                  || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
 293                 ) {
 294  subst:
 295                         w = 1;
 296                         wc = CONFIG_SUBST_WCHAR;
 297                 }
 298         }
 299
 300 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
 301         *width_adj += w;
 302 #endif
 303         return wc;
 304 }
 305 #else /* !UNICODE */
 306 static size_t load_string(const char *src, int maxsize)
 307 {
 308         safe_strncpy(command_ps, src, maxsize);
 309         return strlen(command_ps);
 310 }
 311 # if ENABLE_FEATURE_TAB_COMPLETION
 312 static void save_string(char *dst, unsigned maxsize)
 313 {
 314         safe_strncpy(dst, command_ps, maxsize);
 315 }
 316 # endif
 317 # define BB_PUTCHAR(c) bb_putchar(c)
 318 /* Should never be called: */
 319 int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
 320 #endif
 321
 322
 323 /* Put 'command_ps[cursor]', cursor++.
 324  * Advance cursor on screen. If we reached right margin, scroll text up
 325  * and remove terminal margin effect by printing 'next_char' */
 326 #define HACK_FOR_WRONG_WIDTH 1
 327 static void put_cur_glyph_and_inc_cursor(void)
 328 {
 329         CHAR_T c = command_ps[cursor];
 330         unsigned width = 0;
 331         int ofs_to_right;
 332
 333         if (c == BB_NUL) {
 334                 /* erase character after end of input string */
 335                 c = ' ';
 336         } else {
 337                 /* advance cursor only if we aren't at the end yet */
 338                 cursor++;
 339                 if (unicode_status == UNICODE_ON) {
 340                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
 341                         c = adjust_width_and_validate_wc(&cmdedit_x, c);
 342                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
 343                 } else {
 344                         cmdedit_x++;
 345                 }
 346         }
 347
 348         ofs_to_right = cmdedit_x - cmdedit_termw;
 349         if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
 350                 /* c fits on this line */
 351                 BB_PUTCHAR(c);
 352         }
 353
 354         if (ofs_to_right >= 0) {
 355                 /* we go to the next line */
 356 #if HACK_FOR_WRONG_WIDTH
 357                 /* This works better if our idea of term width is wrong
 358                  * and it is actually wider (often happens on serial lines).
 359                  * Printing CR,LF *forces* cursor to next line.
 360                  * OTOH if terminal width is correct AND terminal does NOT
 361                  * have automargin (IOW: it is moving cursor to next line
 362                  * by itself (which is wrong for VT-10x terminals)),
 363                  * this will break things: there will be one extra empty line */
 364                 puts("\r"); /* + implicit '\n' */
 365 #else
 366                 /* VT-10x terminals don't wrap cursor to next line when last char
 367                  * on the line is printed - cursor stays "over" this char.
 368                  * Need to print _next_ char too (first one to appear on next line)
 369                  * to make cursor move down to next line.
 370                  */
 371                 /* Works ok only if cmdedit_termw is correct. */
 372                 c = command_ps[cursor];
 373                 if (c == BB_NUL)
 374                         c = ' ';
 375                 BB_PUTCHAR(c);
 376                 bb_putchar('\b');
 377 #endif
 378                 cmdedit_y++;
 379                 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
 380                         width = 0;
 381                 } else { /* ofs_to_right > 0 */
 382                         /* wide char c didn't fit on prev line */
 383                         BB_PUTCHAR(c);
 384                 }
 385                 cmdedit_x = width;
 386         }
 387 }
 388
 389 /* Move to end of line (by printing all chars till the end) */
 390 static void put_till_end_and_adv_cursor(void)
 391 {
 392         while (cursor < command_len)
 393                 put_cur_glyph_and_inc_cursor();
 394 }
 395
 396 /* Go to the next line */
 397 static void goto_new_line(void)
 398 {
 399         put_till_end_and_adv_cursor();
 400         if (cmdedit_x != 0)
 401                 bb_putchar('\n');
 402 }
 403
 404 static void beep(void)
 405 {
 406         bb_putchar('\007');
 407 }
 408
 409 static void put_prompt(void)
 410 {
 411         unsigned w;
 412
 413         fputs(cmdedit_prompt, stdout);
 414         fflush_all();
 415         cursor = 0;
 416         w = cmdedit_termw; /* read volatile var once */
 417         cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
 418         cmdedit_x = cmdedit_prmt_len % w;
 419 }
 420
 421 /* Move back one character */
 422 /* (optimized for slow terminals) */
 423 static void input_backward(unsigned num)
 424 {
 425         if (num > cursor)
 426                 num = cursor;
 427         if (num == 0)
 428                 return;
 429         cursor -= num;
 430
 431         if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
 432          && unicode_status == UNICODE_ON
 433         ) {
 434                 /* correct NUM to be equal to _screen_ width */
 435                 int n = num;
 436                 num = 0;
 437                 while (--n >= 0)
 438                         adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
 439                 if (num == 0)
 440                         return;
 441         }
 442
 443         if (cmdedit_x >= num) {
 444                 cmdedit_x -= num;
 445                 if (num <= 4) {
 446                         /* This is longer by 5 bytes on x86.
 447                          * Also gets miscompiled for ARM users
 448                          * (busybox.net/bugs/view.php?id=2274).
 449                          * printf(("\b\b\b\b" + 4) - num);
 450                          * return;
 451                          */
 452                         do {
 453                                 bb_putchar('\b');
 454                         } while (--num);
 455                         return;
 456                 }
 457                 printf("\033[%uD", num);
 458                 return;
 459         }
 460
 461         /* Need to go one or more lines up */
 462         if (ENABLE_UNICODE_WIDE_WCHARS) {
 463                 /* With wide chars, it is hard to "backtrack"
 464                  * and reliably figure out where to put cursor.
 465                  * Example (<> is a wide char; # is an ordinary char, _ cursor):
 466                  * |prompt: <><> |
 467                  * |<><><><><><> |
 468                  * |_            |
 469                  * and user presses left arrow. num = 1, cmdedit_x = 0,
 470                  * We need to go up one line, and then - how do we know that
 471                  * we need to go *10* positions to the right? Because
 472                  * |prompt: <>#<>|
 473                  * |<><><>#<><><>|
 474                  * |_            |
 475                  * in this situation we need to go *11* positions to the right.
 476                  *
 477                  * A simpler thing to do is to redraw everything from the start
 478                  * up to new cursor position (which is already known):
 479                  */
 480                 unsigned sv_cursor;
 481                 /* go to 1st column; go up to first line */
 482                 printf("\r" "\033[%uA", cmdedit_y);
 483                 cmdedit_y = 0;
 484                 sv_cursor = cursor;
 485                 put_prompt(); /* sets cursor to 0 */
 486                 while (cursor < sv_cursor)
 487                         put_cur_glyph_and_inc_cursor();
 488         } else {
 489                 int lines_up;
 490                 unsigned width;
 491                 /* num = chars to go back from the beginning of current line: */
 492                 num -= cmdedit_x;
 493                 width = cmdedit_termw; /* read volatile var once */
 494                 /* num=1...w: one line up, w+1...2w: two, etc: */
 495                 lines_up = 1 + (num - 1) / width;
 496                 cmdedit_x = (width * cmdedit_y - num) % width;
 497                 cmdedit_y -= lines_up;
 498                 /* go to 1st column; go up */
 499                 printf("\r" "\033[%uA", lines_up);
 500                 /* go to correct column.
 501                  * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
 502                  * need to *make sure* we skip it if cmdedit_x == 0 */
 503                 if (cmdedit_x)
 504                         printf("\033[%uC", cmdedit_x);
 505         }
 506 }
 507
 508 /* draw prompt, editor line, and clear tail */
 509 static void redraw(int y, int back_cursor)
 510 {
 511         if (y > 0) /* up y lines */
 512                 printf("\033[%uA", y);
 513         bb_putchar('\r');
 514         put_prompt();
 515         put_till_end_and_adv_cursor();
 516         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 517         input_backward(back_cursor);
 518 }
 519
 520 /* Delete the char in front of the cursor, optionally saving it
 521  * for later putback */
 522 #if !ENABLE_FEATURE_EDITING_VI
 523 static void input_delete(void)
 524 #define input_delete(save) input_delete()
 525 #else
 526 static void input_delete(int save)
 527 #endif
 528 {
 529         int j = cursor;
 530
 531         if (j == (int)command_len)
 532                 return;
 533
 534 #if ENABLE_FEATURE_EDITING_VI
 535         if (save) {
 536                 if (newdelflag) {
 537                         delptr = delbuf;
 538                         newdelflag = 0;
 539                 }
 540                 if ((delptr - delbuf) < DELBUFSIZ)
 541                         *delptr++ = command_ps[j];
 542         }
 543 #endif
 544
 545         memmove(command_ps + j, command_ps + j + 1,
 546                         /* (command_len + 1 [because of NUL]) - (j + 1)
 547                          * simplified into (command_len - j) */
 548                         (command_len - j) * sizeof(command_ps[0]));
 549         command_len--;
 550         put_till_end_and_adv_cursor();
 551         /* Last char is still visible, erase it (and more) */
 552         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 553         input_backward(cursor - j);     /* back to old pos cursor */
 554 }
 555
 556 #if ENABLE_FEATURE_EDITING_VI
 557 static void put(void)
 558 {
 559         int ocursor;
 560         int j = delptr - delbuf;
 561
 562         if (j == 0)
 563                 return;
 564         ocursor = cursor;
 565         /* open hole and then fill it */
 566         memmove(command_ps + cursor + j, command_ps + cursor,
 567                         (command_len - cursor + 1) * sizeof(command_ps[0]));
 568         memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
 569         command_len += j;
 570         put_till_end_and_adv_cursor();
 571         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 572 }
 573 #endif
 574
 575 /* Delete the char in back of the cursor */
 576 static void input_backspace(void)
 577 {
 578         if (cursor > 0) {
 579                 input_backward(1);
 580                 input_delete(0);
 581         }
 582 }
 583
 584 /* Move forward one character */
 585 static void input_forward(void)
 586 {
 587         if (cursor < command_len)
 588                 put_cur_glyph_and_inc_cursor();
 589 }
 590
 591 #if ENABLE_FEATURE_TAB_COMPLETION
 592
 593 static void free_tab_completion_data(void)
 594 {
 595         if (matches) {
 596                 while (num_matches)
 597                         free(matches[--num_matches]);
 598                 free(matches);
 599                 matches = NULL;
 600         }
 601 }
 602
 603 static void add_match(char *matched)
 604 {
 605         matches = xrealloc_vector(matches, 4, num_matches);
 606         matches[num_matches] = matched;
 607         num_matches++;
 608 }
 609
 610 #if ENABLE_FEATURE_USERNAME_COMPLETION
 611 static void username_tab_completion(char *ud, char *with_shash_flg)
 612 {
 613         struct passwd *entry;
 614         int userlen;
 615
 616         ud++;                           /* ~user/... to user/... */
 617         userlen = strlen(ud);
 618
 619         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 620                 char *sav_ud = ud - 1;
 621                 char *home = NULL;
 622
 623                 if (*ud == '/') {       /* "~/..."     */
 624                         home = home_pwd_buf;
 625                 } else {
 626                         /* "~user/..." */
 627                         char *temp;
 628                         temp = strchr(ud, '/');
 629                         *temp = '\0';           /* ~user\0 */
 630                         entry = getpwnam(ud);
 631                         *temp = '/';            /* restore ~user/... */
 632                         ud = temp;
 633                         if (entry)
 634                                 home = entry->pw_dir;
 635                 }
 636                 if (home) {
 637                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 638                                 /* /home/user/... */
 639                                 sprintf(sav_ud, "%s%s", home, ud);
 640                         }
 641                 }
 642         } else {
 643                 /* "~[^/]*" */
 644                 /* Using _r function to avoid pulling in static buffers */
 645                 char line_buff[256];
 646                 struct passwd pwd;
 647                 struct passwd *result;
 648
 649                 setpwent();
 650                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 651                         /* Null usernames should result in all users as possible completions. */
 652                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 653                                 add_match(xasprintf("~%s/", pwd.pw_name));
 654                         }
 655                 }
 656                 endpwent();
 657         }
 658 }
 659 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 660
 661 enum {
 662         FIND_EXE_ONLY = 0,
 663         FIND_DIR_ONLY = 1,
 664         FIND_FILE_ONLY = 2,
 665 };
 666
 667 static int path_parse(char ***p, int flags)
 668 {
 669         int npth;
 670         const char *pth;
 671         char *tmp;
 672         char **res;
 673
 674         /* if not setenv PATH variable, to search cur dir "." */
 675         if (flags != FIND_EXE_ONLY)
 676                 return 1;
 677
 678         if (state->flags & WITH_PATH_LOOKUP)
 679                 pth = state->path_lookup;
 680         else
 681                 pth = getenv("PATH");
 682         /* PATH=<empty> or PATH=:<empty> */
 683         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 684                 return 1;
 685
 686         tmp = (char*)pth;
 687         npth = 1; /* path component count */
 688         while (1) {
 689                 tmp = strchr(tmp, ':');
 690                 if (!tmp)
 691                         break;
 692                 if (*++tmp == '\0')
 693                         break;  /* :<empty> */
 694                 npth++;
 695         }
 696
 697         res = xmalloc(npth * sizeof(char*));
 698         res[0] = tmp = xstrdup(pth);
 699         npth = 1;
 700         while (1) {
 701                 tmp = strchr(tmp, ':');
 702                 if (!tmp)
 703                         break;
 704                 *tmp++ = '\0'; /* ':' -> '\0' */
 705                 if (*tmp == '\0')
 706                         break; /* :<empty> */
 707                 res[npth++] = tmp;
 708         }
 709         *p = res;
 710         return npth;
 711 }
 712
 713 static void exe_n_cwd_tab_completion(char *command, int type)
 714 {
 715         DIR *dir;
 716         struct dirent *next;
 717         struct stat st;
 718         char *path1[1];
 719         char **paths = path1;
 720         int npaths;
 721         int i;
 722         char *found;
 723         char *pfind = strrchr(command, '/');
 724 /*      char dirbuf[MAX_LINELEN]; */
 725 #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
 726
 727         npaths = 1;
 728         path1[0] = (char*)".";
 729
 730         if (pfind == NULL) {
 731                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 732                 npaths = path_parse(&paths, type);
 733                 pfind = command;
 734         } else {
 735                 /* dirbuf = ".../.../.../" */
 736                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 737 #if ENABLE_FEATURE_USERNAME_COMPLETION
 738                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 739                         username_tab_completion(dirbuf, dirbuf);
 740 #endif
 741                 paths[0] = dirbuf;
 742                 /* point to 'l' in "..../last_component" */
 743                 pfind++;
 744         }
 745
 746         for (i = 0; i < npaths; i++) {
 747                 dir = opendir(paths[i]);
 748                 if (!dir)
 749                         continue; /* don't print an error */
 750
 751                 while ((next = readdir(dir)) != NULL) {
 752                         int len1;
 753                         const char *str_found = next->d_name;
 754
 755                         /* matched? */
 756                         if (strncmp(str_found, pfind, strlen(pfind)))
 757                                 continue;
 758                         /* not see .name without .match */
 759                         if (*str_found == '.' && *pfind == '\0') {
 760                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 761                                         continue;
 762                                 str_found = ""; /* only "/" */
 763                         }
 764                         found = concat_path_file(paths[i], str_found);
 765                         /* hmm, remove in progress? */
 766                         /* NB: stat() first so that we see is it a directory;
 767                          * but if that fails, use lstat() so that
 768                          * we still match dangling links */
 769                         if (stat(found, &st) && lstat(found, &st))
 770                                 goto cont;
 771                         /* find with dirs? */
 772                         if (paths[i] != dirbuf)
 773                                 strcpy(found, next->d_name); /* only name */
 774
 775                         len1 = strlen(found);
 776                         found = xrealloc(found, len1 + 2);
 777                         found[len1] = '\0';
 778                         found[len1+1] = '\0';
 779
 780                         if (S_ISDIR(st.st_mode)) {
 781                                 /* name is a directory */
 782                                 if (found[len1-1] != '/') {
 783                                         found[len1] = '/';
 784                                 }
 785                         } else {
 786                                 /* not put found file if search only dirs for cd */
 787                                 if (type == FIND_DIR_ONLY)
 788                                         goto cont;
 789                         }
 790                         /* Add it to the list */
 791                         add_match(found);
 792                         continue;
 793  cont:
 794                         free(found);
 795                 }
 796                 closedir(dir);
 797         }
 798         if (paths != path1) {
 799                 free(paths[0]); /* allocated memory is only in first member */
 800                 free(paths);
 801         }
 802 #undef dirbuf
 803 }
 804
 805 /* QUOT is used on elements of int_buf[], which are bytes,
 806  * not Unicode chars. Therefore it works correctly even in Unicode mode.
 807  */
 808 #define QUOT (UCHAR_MAX+1)
 809
 810 #define int_buf (S.find_match__int_buf)
 811 #define pos_buf (S.find_match__pos_buf)
 812 /* is must be <= in */
 813 static void collapse_pos(int is, int in)
 814 {
 815         memmove(int_buf+is, int_buf+in, (MAX_LINELEN+1-in)*sizeof(int_buf[0]));
 816         memmove(pos_buf+is, pos_buf+in, (MAX_LINELEN+1-in)*sizeof(pos_buf[0]));
 817 }
 818 static NOINLINE int find_match(char *matchBuf, int *len_with_quotes)
 819 {
 820         int i, j;
 821         int command_mode;
 822         int c, c2;
 823 /*      Were local, but it uses too much stack */
 824 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 825 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 826
 827         /* set to integer dimension characters and own positions */
 828         for (i = 0;; i++) {
 829                 int_buf[i] = (unsigned char)matchBuf[i];
 830                 if (int_buf[i] == 0) {
 831                         pos_buf[i] = -1; /* end-fo-line indicator */
 832                         break;
 833                 }
 834                 pos_buf[i] = i;
 835         }
 836
 837         /* mask \+symbol and convert '\t' to ' ' */
 838         for (i = j = 0; matchBuf[i]; i++, j++) {
 839                 if (matchBuf[i] == '\\') {
 840                         collapse_pos(j, j + 1);
 841                         int_buf[j] |= QUOT;
 842                         i++;
 843                 }
 844         }
 845         /* mask "symbols" or 'symbols' */
 846         c2 = 0;
 847         for (i = 0; int_buf[i]; i++) {
 848                 c = int_buf[i];
 849                 if (c == '\'' || c == '"') {
 850                         if (c2 == 0)
 851                                 c2 = c;
 852                         else {
 853                                 if (c == c2)
 854                                         c2 = 0;
 855                                 else
 856                                         int_buf[i] |= QUOT;
 857                         }
 858                 } else if (c2 != 0 && c != '$')
 859                         int_buf[i] |= QUOT;
 860         }
 861
 862         /* skip commands with arguments if line has commands delimiters */
 863         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 864         for (i = 0; int_buf[i]; i++) {
 865                 c = int_buf[i];
 866                 c2 = int_buf[i + 1];
 867                 j = i ? int_buf[i - 1] : -1;
 868                 command_mode = 0;
 869                 if (c == ';' || c == '&' || c == '|') {
 870                         command_mode = 1 + (c == c2);
 871                         if (c == '&') {
 872                                 if (j == '>' || j == '<')
 873                                         command_mode = 0;
 874                         } else if (c == '|' && j == '>')
 875                                 command_mode = 0;
 876                 }
 877                 if (command_mode) {
 878                         collapse_pos(0, i + command_mode);
 879                         i = -1;  /* hack incremet */
 880                 }
 881         }
 882         /* collapse `command...` */
 883         for (i = 0; int_buf[i]; i++) {
 884                 if (int_buf[i] == '`') {
 885                         for (j = i + 1; int_buf[j]; j++)
 886                                 if (int_buf[j] == '`') {
 887                                         collapse_pos(i, j + 1);
 888                                         j = 0;
 889                                         break;
 890                                 }
 891                         if (j) {
 892                                 /* not found closing ` - command mode, collapse all previous */
 893                                 collapse_pos(0, i + 1);
 894                                 break;
 895                         } else
 896                                 i--;  /* hack incremet */
 897                 }
 898         }
 899
 900         /* collapse (command...(command...)...) or {command...{command...}...} */
 901         c = 0;  /* "recursive" level */
 902         c2 = 0;
 903         for (i = 0; int_buf[i]; i++) {
 904                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 905                         if (int_buf[i] == '(')
 906                                 c++;
 907                         else
 908                                 c2++;
 909                         collapse_pos(0, i + 1);
 910                         i = -1;  /* hack incremet */
 911                 }
 912         }
 913         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) {
 914                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 915                         if (int_buf[i] == ')')
 916                                 c--;
 917                         else
 918                                 c2--;
 919                         collapse_pos(0, i + 1);
 920                         i = -1;  /* hack incremet */
 921                 }
 922         }
 923
 924         /* skip first not quote space */
 925         for (i = 0; int_buf[i]; i++)
 926                 if (int_buf[i] != ' ')
 927                         break;
 928         if (i)
 929                 collapse_pos(0, i);
 930
 931         /* set find mode for completion */
 932         command_mode = FIND_EXE_ONLY;
 933         for (i = 0; int_buf[i]; i++) {
 934                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 935                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 936                          && matchBuf[pos_buf[0]] == 'c'
 937                          && matchBuf[pos_buf[1]] == 'd'
 938                         ) {
 939                                 command_mode = FIND_DIR_ONLY;
 940                         } else {
 941                                 command_mode = FIND_FILE_ONLY;
 942                                 break;
 943                         }
 944                 }
 945         }
 946         for (i = 0; int_buf[i]; i++)
 947                 /* "strlen" */;
 948         /* find last word */
 949         for (--i; i >= 0; i--) {
 950                 c = int_buf[i];
 951                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 952                         collapse_pos(0, i + 1);
 953                         break;
 954                 }
 955         }
 956         /* skip first not quoted '\'' or '"' */
 957         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 958                 /*skip*/;
 959         /* collapse quote or unquote // or /~ */
 960         while ((int_buf[i] & ~QUOT) == '/'
 961          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 962         ) {
 963                 i++;
 964         }
 965
 966         /* set only match and destroy quotes */
 967         j = 0;
 968         for (c = 0; pos_buf[i] >= 0; i++) {
 969                 matchBuf[c++] = matchBuf[pos_buf[i]];
 970                 j = pos_buf[i] + 1;
 971         }
 972         matchBuf[c] = '\0';
 973         /* old length matchBuf with quotes symbols */
 974         *len_with_quotes = j ? j - pos_buf[0] : 0;
 975
 976         return command_mode;
 977 }
 978 #undef int_buf
 979 #undef pos_buf
 980
 981 /*
 982  * display by column (original idea from ls applet,
 983  * very optimized by me :)
 984  */
 985 static void showfiles(void)
 986 {
 987         int ncols, row;
 988         int column_width = 0;
 989         int nfiles = num_matches;
 990         int nrows = nfiles;
 991         int l;
 992
 993         /* find the longest file name - use that as the column width */
 994         for (row = 0; row < nrows; row++) {
 995                 l = unicode_strwidth(matches[row]);
 996                 if (column_width < l)
 997                         column_width = l;
 998         }
 999         column_width += 2;              /* min space for columns */
1000         ncols = cmdedit_termw / column_width;
1001
1002         if (ncols > 1) {
1003                 nrows /= ncols;
1004                 if (nfiles % ncols)
1005                         nrows++;        /* round up fractionals */
1006         } else {
1007                 ncols = 1;
1008         }
1009         for (row = 0; row < nrows; row++) {
1010                 int n = row;
1011                 int nc;
1012
1013                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
1014                         printf("%s%-*s", matches[n],
1015                                 (int)(column_width - unicode_strwidth(matches[n])), ""
1016                         );
1017                 }
1018                 if (ENABLE_UNICODE_SUPPORT)
1019                         puts(printable_string(NULL, matches[n]));
1020                 else
1021                         puts(matches[n]);
1022         }
1023 }
1024
1025 static char *add_quote_for_spec_chars(char *found)
1026 {
1027         int l = 0;
1028         char *s = xzalloc((strlen(found) + 1) * 2);
1029
1030         while (*found) {
1031                 if (strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", *found))
1032                         s[l++] = '\\';
1033                 s[l++] = *found++;
1034         }
1035         /* s[l] = '\0'; - already is */
1036         return s;
1037 }
1038
1039 /* Do TAB completion */
1040 static void input_tab(smallint *lastWasTab)
1041 {
1042         if (!(state->flags & TAB_COMPLETION))
1043                 return;
1044
1045         if (!*lastWasTab) {
1046                 char *tmp, *tmp1;
1047                 size_t len_found;
1048 /*              char matchBuf[MAX_LINELEN]; */
1049 #define matchBuf (S.input_tab__matchBuf)
1050                 int find_type;
1051                 int recalc_pos;
1052 #if ENABLE_UNICODE_SUPPORT
1053                 /* cursor pos in command converted to multibyte form */
1054                 int cursor_mb;
1055 #endif
1056
1057                 *lastWasTab = TRUE;             /* flop trigger */
1058
1059                 /* Make a local copy of the string --
1060                  * up to the position of the cursor */
1061                 save_string(matchBuf, cursor + 1);
1062 #if ENABLE_UNICODE_SUPPORT
1063                 cursor_mb = strlen(matchBuf);
1064 #endif
1065                 tmp = matchBuf;
1066
1067                 find_type = find_match(matchBuf, &recalc_pos);
1068
1069                 /* Free up any memory already allocated */
1070                 free_tab_completion_data();
1071
1072 #if ENABLE_FEATURE_USERNAME_COMPLETION
1073                 /* If the word starts with `~' and there is no slash in the word,
1074                  * then try completing this word as a username. */
1075                 if (state->flags & USERNAME_COMPLETION)
1076                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
1077                                 username_tab_completion(matchBuf, NULL);
1078 #endif
1079                 /* Try to match any executable in our path and everything
1080                  * in the current working directory */
1081                 if (!matches)
1082                         exe_n_cwd_tab_completion(matchBuf, find_type);
1083                 /* Sort, then remove any duplicates found */
1084                 if (matches) {
1085                         unsigned i;
1086                         int n = 0;
1087                         qsort_string_vector(matches, num_matches);
1088                         for (i = 0; i < num_matches - 1; ++i) {
1089                                 if (matches[i] && matches[i+1]) { /* paranoia */
1090                                         if (strcmp(matches[i], matches[i+1]) == 0) {
1091                                                 free(matches[i]);
1092                                                 matches[i] = NULL; /* paranoia */
1093                                         } else {
1094                                                 matches[n++] = matches[i];
1095                                         }
1096                                 }
1097                         }
1098                         matches[n] = matches[i];
1099                         num_matches = n + 1;
1100                 }
1101                 /* Did we find exactly one match? */
1102                 if (!matches || num_matches > 1) { /* no */
1103                         beep();
1104                         if (!matches)
1105                                 return;         /* not found */
1106                         /* find minimal match */
1107                         tmp1 = xstrdup(matches[0]);
1108                         for (tmp = tmp1; *tmp; tmp++) {
1109                                 for (len_found = 1; len_found < num_matches; len_found++) {
1110                                         if (matches[len_found][tmp - tmp1] != *tmp) {
1111                                                 *tmp = '\0';
1112                                                 break;
1113                                         }
1114                                 }
1115                         }
1116                         if (*tmp1 == '\0') {        /* have unique */
1117                                 free(tmp1);
1118                                 return;
1119                         }
1120                         tmp = add_quote_for_spec_chars(tmp1);
1121                         free(tmp1);
1122                 } else {                        /* one match */
1123                         tmp = add_quote_for_spec_chars(matches[0]);
1124                         /* for next completion current found */
1125                         *lastWasTab = FALSE;
1126
1127                         len_found = strlen(tmp);
1128                         if (tmp[len_found-1] != '/') {
1129                                 tmp[len_found] = ' ';
1130                                 tmp[len_found+1] = '\0';
1131                         }
1132                 }
1133
1134                 len_found = strlen(tmp);
1135 #if !ENABLE_UNICODE_SUPPORT
1136                 /* have space to place the match? */
1137                 /* The result consists of three parts with these lengths: */
1138                 /* (cursor - recalc_pos) + len_found + (command_len - cursor) */
1139                 /* it simplifies into: */
1140                 if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
1141                         /* save tail */
1142                         strcpy(matchBuf, command_ps + cursor);
1143                         /* add match and tail */
1144                         sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
1145                         command_len = strlen(command_ps);
1146                         /* new pos */
1147                         recalc_pos = cursor - recalc_pos + len_found;
1148                         /* write out the matched command */
1149                         redraw(cmdedit_y, command_len - recalc_pos);
1150                 }
1151 #else
1152                 {
1153                         char command[MAX_LINELEN];
1154                         int len = save_string(command, sizeof(command));
1155                         /* have space to place the match? */
1156                         /* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
1157                         if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
1158                                 /* save tail */
1159                                 strcpy(matchBuf, command + cursor_mb);
1160                                 /* where do we want to have cursor after all? */
1161                                 strcpy(&command[cursor_mb - recalc_pos], tmp);
1162                                 len = load_string(command, S.maxsize);
1163                                 /* add match and tail */
1164                                 sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
1165                                 command_len = load_string(command, S.maxsize);
1166                                 /* write out the matched command */
1167                                 redraw(cmdedit_y, command_len - len);
1168                         }
1169                 }
1170 #endif
1171                 free(tmp);
1172 #undef matchBuf
1173         } else {
1174                 /* Ok -- the last char was a TAB.  Since they
1175                  * just hit TAB again, print a list of all the
1176                  * available choices... */
1177                 if (matches && num_matches > 0) {
1178                         /* changed by goto_new_line() */
1179                         int sav_cursor = cursor;
1180
1181                         /* Go to the next line */
1182                         goto_new_line();
1183                         showfiles();
1184                         redraw(0, command_len - sav_cursor);
1185                 }
1186         }
1187 }
1188
1189 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
1190
1191
1192 line_input_t* FAST_FUNC new_line_input_t(int flags)
1193 {
1194         line_input_t *n = xzalloc(sizeof(*n));
1195         n->flags = flags;
1196         return n;
1197 }
1198
1199
1200 #if MAX_HISTORY > 0
1201
1202 static void save_command_ps_at_cur_history(void)
1203 {
1204         if (command_ps[0] != BB_NUL) {
1205                 int cur = state->cur_history;
1206                 free(state->history[cur]);
1207
1208 # if ENABLE_UNICODE_SUPPORT
1209                 {
1210                         char tbuf[MAX_LINELEN];
1211                         save_string(tbuf, sizeof(tbuf));
1212                         state->history[cur] = xstrdup(tbuf);
1213                 }
1214 # else
1215                 state->history[cur] = xstrdup(command_ps);
1216 # endif
1217         }
1218 }
1219
1220 /* state->flags is already checked to be nonzero */
1221 static int get_previous_history(void)
1222 {
1223         if ((state->flags & DO_HISTORY) && state->cur_history) {
1224                 save_command_ps_at_cur_history();
1225                 state->cur_history--;
1226                 return 1;
1227         }
1228         beep();
1229         return 0;
1230 }
1231
1232 static int get_next_history(void)
1233 {
1234         if (state->flags & DO_HISTORY) {
1235                 if (state->cur_history < state->cnt_history) {
1236                         save_command_ps_at_cur_history(); /* save the current history line */
1237                         return ++state->cur_history;
1238                 }
1239         }
1240         beep();
1241         return 0;
1242 }
1243
1244 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1245 /* We try to ensure that concurrent additions to the history
1246  * do not overwrite each other.
1247  * Otherwise shell users get unhappy.
1248  *
1249  * History file is trimmed lazily, when it grows several times longer
1250  * than configured MAX_HISTORY lines.
1251  */
1252
1253 static void free_line_input_t(line_input_t *n)
1254 {
1255         int i = n->cnt_history;
1256         while (i > 0)
1257                 free(n->history[--i]);
1258         free(n);
1259 }
1260
1261 /* state->flags is already checked to be nonzero */
1262 static void load_history(line_input_t *st_parm)
1263 {
1264         char *temp_h[MAX_HISTORY];
1265         char *line;
1266         FILE *fp;
1267         unsigned idx, i, line_len;
1268
1269         /* NB: do not trash old history if file can't be opened */
1270
1271         fp = fopen_for_read(st_parm->hist_file);
1272         if (fp) {
1273                 /* clean up old history */
1274                 for (idx = st_parm->cnt_history; idx > 0;) {
1275                         idx--;
1276                         free(st_parm->history[idx]);
1277                         st_parm->history[idx] = NULL;
1278                 }
1279
1280                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1281                 memset(temp_h, 0, sizeof(temp_h));
1282                 st_parm->cnt_history_in_file = idx = 0;
1283                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1284                         if (line[0] == '\0') {
1285                                 free(line);
1286                                 continue;
1287                         }
1288                         free(temp_h[idx]);
1289                         temp_h[idx] = line;
1290                         st_parm->cnt_history_in_file++;
1291                         idx++;
1292                         if (idx == MAX_HISTORY)
1293                                 idx = 0;
1294                 }
1295                 fclose(fp);
1296
1297                 /* find first non-NULL temp_h[], if any */
1298                 if (st_parm->cnt_history_in_file) {
1299                         while (temp_h[idx] == NULL) {
1300                                 idx++;
1301                                 if (idx == MAX_HISTORY)
1302                                         idx = 0;
1303                         }
1304                 }
1305
1306                 /* copy temp_h[] to st_parm->history[] */
1307                 for (i = 0; i < MAX_HISTORY;) {
1308                         line = temp_h[idx];
1309                         if (!line)
1310                                 break;
1311                         idx++;
1312                         if (idx == MAX_HISTORY)
1313                                 idx = 0;
1314                         line_len = strlen(line);
1315                         if (line_len >= MAX_LINELEN)
1316                                 line[MAX_LINELEN-1] = '\0';
1317                         st_parm->history[i++] = line;
1318                 }
1319                 st_parm->cnt_history = i;
1320         }
1321 }
1322
1323 /* state->flags is already checked to be nonzero */
1324 static void save_history(char *str)
1325 {
1326         int fd;
1327         int len, len2;
1328
1329         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0666);
1330         if (fd < 0)
1331                 return;
1332         xlseek(fd, 0, SEEK_END); /* paranoia */
1333         len = strlen(str);
1334         str[len] = '\n'; /* we (try to) do atomic write */
1335         len2 = full_write(fd, str, len + 1);
1336         str[len] = '\0';
1337         close(fd);
1338         if (len2 != len + 1)
1339                 return; /* "wtf?" */
1340
1341         /* did we write so much that history file needs trimming? */
1342         state->cnt_history_in_file++;
1343         if (state->cnt_history_in_file > MAX_HISTORY * 4) {
1344                 FILE *fp;
1345                 char *new_name;
1346                 line_input_t *st_temp;
1347                 int i;
1348
1349                 /* we may have concurrently written entries from others.
1350                  * load them */
1351                 st_temp = new_line_input_t(state->flags);
1352                 st_temp->hist_file = state->hist_file;
1353                 load_history(st_temp);
1354
1355                 /* write out temp file and replace hist_file atomically */
1356                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1357                 fp = fopen_for_write(new_name);
1358                 if (fp) {
1359                         for (i = 0; i < st_temp->cnt_history; i++)
1360                                 fprintf(fp, "%s\n", st_temp->history[i]);
1361                         fclose(fp);
1362                         if (rename(new_name, state->hist_file) == 0)
1363                                 state->cnt_history_in_file = st_temp->cnt_history;
1364                 }
1365                 free(new_name);
1366                 free_line_input_t(st_temp);
1367         }
1368 }
1369 # else
1370 #  define load_history(a) ((void)0)
1371 #  define save_history(a) ((void)0)
1372 # endif /* FEATURE_COMMAND_SAVEHISTORY */
1373
1374 static void remember_in_history(char *str)
1375 {
1376         int i;
1377
1378         if (!(state->flags & DO_HISTORY))
1379                 return;
1380         if (str[0] == '\0')
1381                 return;
1382         i = state->cnt_history;
1383         /* Don't save dupes */
1384         if (i && strcmp(state->history[i-1], str) == 0)
1385                 return;
1386
1387         free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1388         state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1389
1390         /* If history[] is full, remove the oldest command */
1391         /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1392         if (i >= MAX_HISTORY) {
1393                 free(state->history[0]);
1394                 for (i = 0; i < MAX_HISTORY-1; i++)
1395                         state->history[i] = state->history[i+1];
1396                 /* i == MAX_HISTORY-1 */
1397         }
1398         /* i <= MAX_HISTORY-1 */
1399         state->history[i++] = xstrdup(str);
1400         /* i <= MAX_HISTORY */
1401         state->cur_history = i;
1402         state->cnt_history = i;
1403 # if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
1404         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1405                 save_history(str);
1406 # endif
1407         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1408 }
1409
1410 #else /* MAX_HISTORY == 0 */
1411 # define remember_in_history(a) ((void)0)
1412 #endif /* MAX_HISTORY */
1413
1414
1415 #if ENABLE_FEATURE_EDITING_VI
1416 /*
1417  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1418  */
1419 static void
1420 vi_Word_motion(int eat)
1421 {
1422         CHAR_T *command = command_ps;
1423
1424         while (cursor < command_len && !BB_isspace(command[cursor]))
1425                 input_forward();
1426         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1427                 input_forward();
1428 }
1429
1430 static void
1431 vi_word_motion(int eat)
1432 {
1433         CHAR_T *command = command_ps;
1434
1435         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1436                 while (cursor < command_len
1437                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1438                 ) {
1439                         input_forward();
1440                 }
1441         } else if (BB_ispunct(command[cursor])) {
1442                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1443                         input_forward();
1444         }
1445
1446         if (cursor < command_len)
1447                 input_forward();
1448
1449         if (eat) {
1450                 while (cursor < command_len && BB_isspace(command[cursor]))
1451                         input_forward();
1452         }
1453 }
1454
1455 static void
1456 vi_End_motion(void)
1457 {
1458         CHAR_T *command = command_ps;
1459
1460         input_forward();
1461         while (cursor < command_len && BB_isspace(command[cursor]))
1462                 input_forward();
1463         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1464                 input_forward();
1465 }
1466
1467 static void
1468 vi_end_motion(void)
1469 {
1470         CHAR_T *command = command_ps;
1471
1472         if (cursor >= command_len-1)
1473                 return;
1474         input_forward();
1475         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1476                 input_forward();
1477         if (cursor >= command_len-1)
1478                 return;
1479         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1480                 while (cursor < command_len-1
1481                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1482                 ) {
1483                         input_forward();
1484                 }
1485         } else if (BB_ispunct(command[cursor])) {
1486                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1487                         input_forward();
1488         }
1489 }
1490
1491 static void
1492 vi_Back_motion(void)
1493 {
1494         CHAR_T *command = command_ps;
1495
1496         while (cursor > 0 && BB_isspace(command[cursor-1]))
1497                 input_backward(1);
1498         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1499                 input_backward(1);
1500 }
1501
1502 static void
1503 vi_back_motion(void)
1504 {
1505         CHAR_T *command = command_ps;
1506
1507         if (cursor <= 0)
1508                 return;
1509         input_backward(1);
1510         while (cursor > 0 && BB_isspace(command[cursor]))
1511                 input_backward(1);
1512         if (cursor <= 0)
1513                 return;
1514         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1515                 while (cursor > 0
1516                  && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1517                 ) {
1518                         input_backward(1);
1519                 }
1520         } else if (BB_ispunct(command[cursor])) {
1521                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1522                         input_backward(1);
1523         }
1524 }
1525 #endif
1526
1527 /* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1528 static void ctrl_left(void)
1529 {
1530         CHAR_T *command = command_ps;
1531
1532         while (1) {
1533                 CHAR_T c;
1534
1535                 input_backward(1);
1536                 if (cursor == 0)
1537                         break;
1538                 c = command[cursor];
1539                 if (c != ' ' && !BB_ispunct(c)) {
1540                         /* we reached a "word" delimited by spaces/punct.
1541                          * go to its beginning */
1542                         while (1) {
1543                                 c = command[cursor - 1];
1544                                 if (c == ' ' || BB_ispunct(c))
1545                                         break;
1546                                 input_backward(1);
1547                                 if (cursor == 0)
1548                                         break;
1549                         }
1550                         break;
1551                 }
1552         }
1553 }
1554 static void ctrl_right(void)
1555 {
1556         CHAR_T *command = command_ps;
1557
1558         while (1) {
1559                 CHAR_T c;
1560
1561                 c = command[cursor];
1562                 if (c == BB_NUL)
1563                         break;
1564                 if (c != ' ' && !BB_ispunct(c)) {
1565                         /* we reached a "word" delimited by spaces/punct.
1566                          * go to its end + 1 */
1567                         while (1) {
1568                                 input_forward();
1569                                 c = command[cursor];
1570                                 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1571                                         break;
1572                         }
1573                         break;
1574                 }
1575                 input_forward();
1576         }
1577 }
1578
1579
1580 /*
1581  * read_line_input and its helpers
1582  */
1583
1584 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1585 static void ask_terminal(void)
1586 {
1587         /* Ask terminal where is the cursor now.
1588          * lineedit_read_key handles response and corrects
1589          * our idea of current cursor position.
1590          * Testcase: run "echo -n long_line_long_line_long_line",
1591          * then type in a long, wrapping command and try to
1592          * delete it using backspace key.
1593          * Note: we print it _after_ prompt, because
1594          * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1595          */
1596         /* Problem: if there is buffered input on stdin,
1597          * the response will be delivered later,
1598          * possibly to an unsuspecting application.
1599          * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1600          * Result:
1601          * ~/srcdevel/bbox/fix/busybox.t4 #
1602          * ~/srcdevel/bbox/fix/busybox.t4 #
1603          * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
1604          * ~/srcdevel/bbox/fix/busybox.t4 #
1605          *
1606          * Checking for input with poll only makes the race narrower,
1607          * I still can trigger it. Strace:
1608          *
1609          * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1610          * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
1611          * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
1612          * poll([{fd=0, events=POLLIN}], 1, 4294967295) = 1 ([{fd=0, revents=POLLIN}])
1613          * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
1614          */
1615         struct pollfd pfd;
1616
1617         pfd.fd = STDIN_FILENO;
1618         pfd.events = POLLIN;
1619         if (safe_poll(&pfd, 1, 0) == 0) {
1620                 S.sent_ESC_br6n = 1;
1621                 fputs("\033" "[6n", stdout);
1622                 fflush_all(); /* make terminal see it ASAP! */
1623         }
1624 }
1625 #else
1626 #define ask_terminal() ((void)0)
1627 #endif
1628
1629 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1630 static void parse_and_put_prompt(const char *prmt_ptr)
1631 {
1632         cmdedit_prompt = prmt_ptr;
1633         cmdedit_prmt_len = strlen(prmt_ptr);
1634         put_prompt();
1635 }
1636 #else
1637 static void parse_and_put_prompt(const char *prmt_ptr)
1638 {
1639         int prmt_len = 0;
1640         size_t cur_prmt_len = 0;
1641         char flg_not_length = '[';
1642         char *prmt_mem_ptr = xzalloc(1);
1643         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1644         char cbuf[2];
1645         char c;
1646         char *pbuf;
1647
1648         cmdedit_prmt_len = 0;
1649
1650         if (!cwd_buf) {
1651                 cwd_buf = (char *)bb_msg_unknown;
1652         }
1653
1654         cbuf[1] = '\0'; /* never changes */
1655
1656         while (*prmt_ptr) {
1657                 char *free_me = NULL;
1658
1659                 pbuf = cbuf;
1660                 c = *prmt_ptr++;
1661                 if (c == '\\') {
1662                         const char *cp = prmt_ptr;
1663                         int l;
1664
1665                         c = bb_process_escape_sequence(&prmt_ptr);
1666                         if (prmt_ptr == cp) {
1667                                 if (*cp == '\0')
1668                                         break;
1669                                 c = *prmt_ptr++;
1670
1671                                 switch (c) {
1672 # if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1673                                 case 'u':
1674                                         pbuf = user_buf ? user_buf : (char*)"";
1675                                         break;
1676 # endif
1677                                 case 'h':
1678                                         pbuf = free_me = safe_gethostname();
1679                                         *strchrnul(pbuf, '.') = '\0';
1680                                         break;
1681                                 case '$':
1682                                         c = (geteuid() == 0 ? '#' : '$');
1683                                         break;
1684 # if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1685                                 case 'w':
1686                                         /* /home/user[/something] -> ~[/something] */
1687                                         pbuf = cwd_buf;
1688                                         l = strlen(home_pwd_buf);
1689                                         if (l != 0
1690                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1691                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1692                                          && strlen(cwd_buf + l) < PATH_MAX
1693                                         ) {
1694                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1695                                         }
1696                                         break;
1697 # endif
1698                                 case 'W':
1699                                         pbuf = cwd_buf;
1700                                         cp = strrchr(pbuf, '/');
1701                                         if (cp != NULL && cp != pbuf)
1702                                                 pbuf += (cp-pbuf) + 1;
1703                                         break;
1704                                 case '!':
1705                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1706                                         break;
1707                                 case 'e': case 'E':     /* \e \E = \033 */
1708                                         c = '\033';
1709                                         break;
1710                                 case 'x': case 'X': {
1711                                         char buf2[4];
1712                                         for (l = 0; l < 3;) {
1713                                                 unsigned h;
1714                                                 buf2[l++] = *prmt_ptr;
1715                                                 buf2[l] = '\0';
1716                                                 h = strtoul(buf2, &pbuf, 16);
1717                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1718                                                         buf2[--l] = '\0';
1719                                                         break;
1720                                                 }
1721                                                 prmt_ptr++;
1722                                         }
1723                                         c = (char)strtoul(buf2, NULL, 16);
1724                                         if (c == 0)
1725                                                 c = '?';
1726                                         pbuf = cbuf;
1727                                         break;
1728                                 }
1729                                 case '[': case ']':
1730                                         if (c == flg_not_length) {
1731                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1732                                                 continue;
1733                                         }
1734                                         break;
1735                                 } /* switch */
1736                         } /* if */
1737                 } /* if */
1738                 cbuf[0] = c;
1739                 cur_prmt_len = strlen(pbuf);
1740                 prmt_len += cur_prmt_len;
1741                 if (flg_not_length != ']')
1742                         cmdedit_prmt_len += cur_prmt_len;
1743                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1744                 free(free_me);
1745         } /* while */
1746
1747         if (cwd_buf != (char *)bb_msg_unknown)
1748                 free(cwd_buf);
1749         cmdedit_prompt = prmt_mem_ptr;
1750         put_prompt();
1751 }
1752 #endif
1753
1754 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1755 {
1756         cmdedit_termw = w;
1757         if (redraw_flg) {
1758                 /* new y for current cursor */
1759                 int new_y = (cursor + cmdedit_prmt_len) / w;
1760                 /* redraw */
1761                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1762                 fflush_all();
1763         }
1764 }
1765
1766 static void win_changed(int nsig)
1767 {
1768         unsigned width;
1769         get_terminal_width_height(0, &width, NULL);
1770         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1771         if (nsig == SIGWINCH)
1772                 signal(SIGWINCH, win_changed); /* rearm ourself */
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_FEATURE_GETUSERNAME_AND_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 /* Stop bug catching using "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
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 */