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 /* FIXME: obsolete CONFIG item? */
  46 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  47
  48 #ifdef TEST
  49 # define ENABLE_FEATURE_EDITING 0
  50 # define ENABLE_FEATURE_TAB_COMPLETION 0
  51 # define ENABLE_FEATURE_USERNAME_COMPLETION 0
  52 # define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  53 #endif
  54
  55
  56 /* Entire file (except TESTing part) sits inside this #if */
  57 #if ENABLE_FEATURE_EDITING
  58
  59
  60 #define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
  61         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  62 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
  63 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  64 #undef IF_FEATURE_GETUSERNAME_AND_HOMEDIR
  65 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
  66 #endif
  67
  68
  69 #define SEQ_CLEAR_TILL_END_OF_SCREEN "\033[J"
  70 //#define SEQ_CLEAR_TILL_END_OF_LINE   "\033[K"
  71
  72
  73 #undef CHAR_T
  74 #if ENABLE_UNICODE_SUPPORT
  75 # define BB_NUL ((wchar_t)0)
  76 # define CHAR_T wchar_t
  77 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
  78 # if ENABLE_FEATURE_EDITING_VI
  79 static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
  80 # endif
  81 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
  82 # undef isspace
  83 # undef isalnum
  84 # undef ispunct
  85 # undef isprint
  86 # define isspace isspace_must_not_be_used
  87 # define isalnum isalnum_must_not_be_used
  88 # define ispunct ispunct_must_not_be_used
  89 # define isprint isprint_must_not_be_used
  90 #else
  91 # define BB_NUL '\0'
  92 # define CHAR_T char
  93 # define BB_isspace(c) isspace(c)
  94 # define BB_isalnum(c) isalnum(c)
  95 # define BB_ispunct(c) ispunct(c)
  96 #endif
  97
  98
  99 # if ENABLE_UNICODE_PRESERVE_BROKEN
 100 #  define unicode_mark_inv_wchar(wc)   ((wc) | 0x20000000)
 101 #  define unicode_is_inv_wchar(wc)     ((wc) & 0x20000000)
 102 # else
 103 #  define unicode_is_inv_wchar(wc)     0
 104 # endif
 105
 106
 107 enum {
 108         /* We use int16_t for positions, need to limit line len */
 109         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
 110                       ? CONFIG_FEATURE_EDITING_MAX_LEN
 111                       : 0x7ff0
 112 };
 113
 114 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 115 static const char null_str[] ALIGN1 = "";
 116 #endif
 117
 118 /* We try to minimize both static and stack usage. */
 119 struct lineedit_statics {
 120         line_input_t *state;
 121
 122         volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
 123         sighandler_t previous_SIGWINCH_handler;
 124
 125         unsigned cmdedit_x;        /* real x (col) terminal position */
 126         unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
 127         unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
 128
 129         unsigned cursor;
 130         int command_len; /* must be signed */
 131         /* signed maxsize: we want x in "if (x > S.maxsize)"
 132          * to _not_ be promoted to unsigned */
 133         int maxsize;
 134         CHAR_T *command_ps;
 135
 136         const char *cmdedit_prompt;
 137 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 138         int num_ok_lines; /* = 1; */
 139 #endif
 140
 141 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 142         char *user_buf;
 143         char *home_pwd_buf; /* = (char*)null_str; */
 144 #endif
 145
 146 #if ENABLE_FEATURE_TAB_COMPLETION
 147         char **matches;
 148         unsigned num_matches;
 149 #endif
 150
 151 #if ENABLE_FEATURE_EDITING_VI
 152 #define DELBUFSIZ 128
 153         CHAR_T *delptr;
 154         smallint newdelflag;     /* whether delbuf should be reused yet */
 155         CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 156 #endif
 157 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 158         smallint sent_ESC_br6n;
 159 #endif
 160
 161         /* Formerly these were big buffers on stack: */
 162 #if ENABLE_FEATURE_TAB_COMPLETION
 163         char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
 164         char input_tab__matchBuf[MAX_LINELEN];
 165         int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
 166         int16_t find_match__pos_buf[MAX_LINELEN + 1];
 167 #endif
 168 };
 169
 170 /* See lineedit_ptr_hack.c */
 171 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 172
 173 #define S (*lineedit_ptr_to_statics)
 174 #define state            (S.state           )
 175 #define cmdedit_termw    (S.cmdedit_termw   )
 176 #define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
 177 #define cmdedit_x        (S.cmdedit_x       )
 178 #define cmdedit_y        (S.cmdedit_y       )
 179 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 180 #define cursor           (S.cursor          )
 181 #define command_len      (S.command_len     )
 182 #define command_ps       (S.command_ps      )
 183 #define cmdedit_prompt   (S.cmdedit_prompt  )
 184 #define num_ok_lines     (S.num_ok_lines    )
 185 #define user_buf         (S.user_buf        )
 186 #define home_pwd_buf     (S.home_pwd_buf    )
 187 #define matches          (S.matches         )
 188 #define num_matches      (S.num_matches     )
 189 #define delptr           (S.delptr          )
 190 #define newdelflag       (S.newdelflag      )
 191 #define delbuf           (S.delbuf          )
 192
 193 #define INIT_S() do { \
 194         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 195         barrier(); \
 196         cmdedit_termw = 80; \
 197         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
 198         IF_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 199 } while (0)
 200 static void deinit_S(void)
 201 {
 202 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 203         /* This one is allocated only if FANCY_PROMPT is on
 204          * (otherwise it points to verbatim prompt (NOT malloced) */
 205         free((char*)cmdedit_prompt);
 206 #endif
 207 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 208         free(user_buf);
 209         if (home_pwd_buf != null_str)
 210                 free(home_pwd_buf);
 211 #endif
 212         free(lineedit_ptr_to_statics);
 213 }
 214 #define DEINIT_S() deinit_S()
 215
 216
 217 #if ENABLE_UNICODE_SUPPORT
 218 static size_t load_string(const char *src, int maxsize)
 219 {
 220         ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
 221         if (len < 0)
 222                 len = 0;
 223         command_ps[len] = 0;
 224         return len;
 225 }
 226 static unsigned save_string(char *dst, unsigned maxsize)
 227 {
 228 # if !ENABLE_UNICODE_PRESERVE_BROKEN
 229         ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
 230         if (len < 0)
 231                 len = 0;
 232         dst[len] = '\0';
 233         return len;
 234 # else
 235         unsigned dstpos = 0;
 236         unsigned srcpos = 0;
 237
 238         maxsize--;
 239         while (dstpos < maxsize) {
 240                 wchar_t wc;
 241                 int n = srcpos;
 242                 while ((wc = command_ps[srcpos]) != 0
 243                     && !unicode_is_inv_wchar(wc)
 244                 ) {
 245                         srcpos++;
 246                 }
 247                 command_ps[srcpos] = 0;
 248                 n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
 249                 if (n < 0) /* should not happen */
 250                         break;
 251                 dstpos += n;
 252                 if (wc == 0) /* usually is */
 253                         break;
 254                 /* We do have invalid byte here! */
 255                 command_ps[srcpos] = wc; /* restore it */
 256                 srcpos++;
 257                 if (dstpos == maxsize)
 258                         break;
 259                 dst[dstpos++] = (char) wc;
 260         }
 261         dst[dstpos] = '\0';
 262         return dstpos;
 263 # endif
 264 }
 265 /* I thought just fputwc(c, stdout) would work. But no... */
 266 static void BB_PUTCHAR(wchar_t c)
 267 {
 268         char buf[MB_CUR_MAX + 1];
 269         mbstate_t mbst = { 0 };
 270         ssize_t len;
 271
 272         if (unicode_is_inv_wchar(c))
 273                 c = CONFIG_SUBST_WCHAR;
 274         len = wcrtomb(buf, c, &mbst);
 275         if (len > 0) {
 276                 buf[len] = '\0';
 277                 fputs(buf, stdout);
 278         }
 279 }
 280 #else
 281 static size_t load_string(const char *src, int maxsize)
 282 {
 283         safe_strncpy(command_ps, src, maxsize);
 284         return strlen(command_ps);
 285 }
 286 # if ENABLE_FEATURE_TAB_COMPLETION
 287 static void save_string(char *dst, unsigned maxsize)
 288 {
 289         safe_strncpy(dst, command_ps, maxsize);
 290 }
 291 # endif
 292 # define BB_PUTCHAR(c) bb_putchar(c)
 293 #endif
 294
 295
 296 /* Put 'command_ps[cursor]', cursor++.
 297  * Advance cursor on screen. If we reached right margin, scroll text up
 298  * and remove terminal margin effect by printing 'next_char' */
 299 #define HACK_FOR_WRONG_WIDTH 1
 300 static void put_cur_glyph_and_inc_cursor(void)
 301 {
 302         CHAR_T c = command_ps[cursor];
 303
 304         if (c == BB_NUL) {
 305                 /* erase character after end of input string */
 306                 c = ' ';
 307         } else {
 308                 /* advance cursor only if we aren't at the end yet */
 309                 cursor++;
 310                 cmdedit_x++;
 311         }
 312
 313 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 314         /* Display non-printable characters in reverse */
 315         if (!BB_isprint(c)) {
 316                 if (c >= 128)
 317                         c -= 128;
 318                 if (c < ' ')
 319                         c += '@';
 320                 if (c == 127)
 321                         c = '?';
 322                 printf("\033[7m%c\033[0m", c);
 323         } else
 324 #endif
 325         {
 326                 BB_PUTCHAR(c);
 327         }
 328         if (cmdedit_x >= cmdedit_termw) {
 329                 /* terminal is scrolled down */
 330                 cmdedit_y++;
 331                 cmdedit_x = 0;
 332 #if HACK_FOR_WRONG_WIDTH
 333                 /* This works better if our idea of term width is wrong
 334                  * and it is actually wider (often happens on serial lines).
 335                  * Printing CR,LF *forces* cursor to next line.
 336                  * OTOH if terminal width is correct AND terminal does NOT
 337                  * have automargin (IOW: it is moving cursor to next line
 338                  * by itself (which is wrong for VT-10x terminals)),
 339                  * this will break things: there will be one extra empty line */
 340                 puts("\r"); /* + implicit '\n' */
 341 #else
 342                 /* VT-10x terminals don't wrap cursor to next line when last char
 343                  * on the line is printed - cursor stays "over" this char.
 344                  * Need to print _next_ char too (first one to appear on next line)
 345                  * to make cursor move down to next line.
 346                  */
 347                 /* Works ok only if cmdedit_termw is correct. */
 348                 c = command_ps[cursor];
 349                 if (c == BB_NUL)
 350                         c = ' ';
 351                 BB_PUTCHAR(c);
 352                 bb_putchar('\b');
 353 #endif
 354         }
 355 }
 356
 357 /* Move to end of line (by printing all chars till the end) */
 358 static void put_till_end_and_adv_cursor(void)
 359 {
 360         while (cursor < command_len)
 361                 put_cur_glyph_and_inc_cursor();
 362 }
 363
 364 /* Go to the next line */
 365 static void goto_new_line(void)
 366 {
 367         put_till_end_and_adv_cursor();
 368         if (cmdedit_x)
 369                 bb_putchar('\n');
 370 }
 371
 372
 373 static void out1str(const char *s)
 374 {
 375         if (s)
 376                 fputs(s, stdout);
 377 }
 378
 379 static void beep(void)
 380 {
 381         bb_putchar('\007');
 382 }
 383
 384 /* Move back one character */
 385 /* (optimized for slow terminals) */
 386 static void input_backward(unsigned num)
 387 {
 388         int count_y;
 389
 390         if (num > cursor)
 391                 num = cursor;
 392         if (!num)
 393                 return;
 394         cursor -= num;
 395
 396         if (cmdedit_x >= num) {
 397                 cmdedit_x -= num;
 398                 if (num <= 4) {
 399                         /* This is longer by 5 bytes on x86.
 400                          * Also gets miscompiled for ARM users
 401                          * (busybox.net/bugs/view.php?id=2274).
 402                          * printf(("\b\b\b\b" + 4) - num);
 403                          * return;
 404                          */
 405                         do {
 406                                 bb_putchar('\b');
 407                         } while (--num);
 408                         return;
 409                 }
 410                 printf("\033[%uD", num);
 411                 return;
 412         }
 413
 414         /* Need to go one or more lines up */
 415         num -= cmdedit_x;
 416         {
 417                 unsigned w = cmdedit_termw; /* volatile var */
 418                 count_y = 1 + (num / w);
 419                 cmdedit_y -= count_y;
 420                 cmdedit_x = w * count_y - num;
 421         }
 422         /* go to 1st column; go up; go to correct column */
 423         printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
 424 }
 425
 426 static void put_prompt(void)
 427 {
 428         unsigned w;
 429
 430         out1str(cmdedit_prompt);
 431         fflush_all();
 432         cursor = 0;
 433         w = cmdedit_termw; /* read volatile var once */
 434         cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
 435         cmdedit_x = cmdedit_prmt_len % w;
 436 }
 437
 438 /* draw prompt, editor line, and clear tail */
 439 static void redraw(int y, int back_cursor)
 440 {
 441         if (y > 0)  /* up to start y */
 442                 printf("\033[%uA", y);
 443         bb_putchar('\r');
 444         put_prompt();
 445         put_till_end_and_adv_cursor();
 446         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 447         input_backward(back_cursor);
 448 }
 449
 450 /* Delete the char in front of the cursor, optionally saving it
 451  * for later putback */
 452 #if !ENABLE_FEATURE_EDITING_VI
 453 static void input_delete(void)
 454 #define input_delete(save) input_delete()
 455 #else
 456 static void input_delete(int save)
 457 #endif
 458 {
 459         int j = cursor;
 460
 461         if (j == (int)command_len)
 462                 return;
 463
 464 #if ENABLE_FEATURE_EDITING_VI
 465         if (save) {
 466                 if (newdelflag) {
 467                         delptr = delbuf;
 468                         newdelflag = 0;
 469                 }
 470                 if ((delptr - delbuf) < DELBUFSIZ)
 471                         *delptr++ = command_ps[j];
 472         }
 473 #endif
 474
 475         memmove(command_ps + j, command_ps + j + 1,
 476                         /* (command_len + 1 [because of NUL]) - (j + 1)
 477                          * simplified into (command_len - j) */
 478                         (command_len - j) * sizeof(command_ps[0]));
 479         command_len--;
 480         put_till_end_and_adv_cursor();
 481         /* Last char is still visible, erase it (and more) */
 482         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 483         input_backward(cursor - j);     /* back to old pos cursor */
 484 }
 485
 486 #if ENABLE_FEATURE_EDITING_VI
 487 static void put(void)
 488 {
 489         int ocursor;
 490         int j = delptr - delbuf;
 491
 492         if (j == 0)
 493                 return;
 494         ocursor = cursor;
 495         /* open hole and then fill it */
 496         memmove(command_ps + cursor + j, command_ps + cursor,
 497                         (command_len - cursor + 1) * sizeof(command_ps[0]));
 498         memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
 499         command_len += j;
 500         put_till_end_and_adv_cursor();
 501         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 502 }
 503 #endif
 504
 505 /* Delete the char in back of the cursor */
 506 static void input_backspace(void)
 507 {
 508         if (cursor > 0) {
 509                 input_backward(1);
 510                 input_delete(0);
 511         }
 512 }
 513
 514 /* Move forward one character */
 515 static void input_forward(void)
 516 {
 517         if (cursor < command_len)
 518                 put_cur_glyph_and_inc_cursor();
 519 }
 520
 521 #if ENABLE_FEATURE_TAB_COMPLETION
 522
 523 static void free_tab_completion_data(void)
 524 {
 525         if (matches) {
 526                 while (num_matches)
 527                         free(matches[--num_matches]);
 528                 free(matches);
 529                 matches = NULL;
 530         }
 531 }
 532
 533 static void add_match(char *matched)
 534 {
 535         matches = xrealloc_vector(matches, 4, num_matches);
 536         matches[num_matches] = matched;
 537         num_matches++;
 538 }
 539
 540 #if ENABLE_FEATURE_USERNAME_COMPLETION
 541 static void username_tab_completion(char *ud, char *with_shash_flg)
 542 {
 543         struct passwd *entry;
 544         int userlen;
 545
 546         ud++;                           /* ~user/... to user/... */
 547         userlen = strlen(ud);
 548
 549         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 550                 char *sav_ud = ud - 1;
 551                 char *home = NULL;
 552
 553                 if (*ud == '/') {       /* "~/..."     */
 554                         home = home_pwd_buf;
 555                 } else {
 556                         /* "~user/..." */
 557                         char *temp;
 558                         temp = strchr(ud, '/');
 559                         *temp = '\0';           /* ~user\0 */
 560                         entry = getpwnam(ud);
 561                         *temp = '/';            /* restore ~user/... */
 562                         ud = temp;
 563                         if (entry)
 564                                 home = entry->pw_dir;
 565                 }
 566                 if (home) {
 567                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 568                                 /* /home/user/... */
 569                                 sprintf(sav_ud, "%s%s", home, ud);
 570                         }
 571                 }
 572         } else {
 573                 /* "~[^/]*" */
 574                 /* Using _r function to avoid pulling in static buffers */
 575                 char line_buff[256];
 576                 struct passwd pwd;
 577                 struct passwd *result;
 578
 579                 setpwent();
 580                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 581                         /* Null usernames should result in all users as possible completions. */
 582                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 583                                 add_match(xasprintf("~%s/", pwd.pw_name));
 584                         }
 585                 }
 586                 endpwent();
 587         }
 588 }
 589 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 590
 591 enum {
 592         FIND_EXE_ONLY = 0,
 593         FIND_DIR_ONLY = 1,
 594         FIND_FILE_ONLY = 2,
 595 };
 596
 597 static int path_parse(char ***p, int flags)
 598 {
 599         int npth;
 600         const char *pth;
 601         char *tmp;
 602         char **res;
 603
 604         /* if not setenv PATH variable, to search cur dir "." */
 605         if (flags != FIND_EXE_ONLY)
 606                 return 1;
 607
 608         if (state->flags & WITH_PATH_LOOKUP)
 609                 pth = state->path_lookup;
 610         else
 611                 pth = getenv("PATH");
 612         /* PATH=<empty> or PATH=:<empty> */
 613         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 614                 return 1;
 615
 616         tmp = (char*)pth;
 617         npth = 1; /* path component count */
 618         while (1) {
 619                 tmp = strchr(tmp, ':');
 620                 if (!tmp)
 621                         break;
 622                 if (*++tmp == '\0')
 623                         break;  /* :<empty> */
 624                 npth++;
 625         }
 626
 627         res = xmalloc(npth * sizeof(char*));
 628         res[0] = tmp = xstrdup(pth);
 629         npth = 1;
 630         while (1) {
 631                 tmp = strchr(tmp, ':');
 632                 if (!tmp)
 633                         break;
 634                 *tmp++ = '\0'; /* ':' -> '\0' */
 635                 if (*tmp == '\0')
 636                         break; /* :<empty> */
 637                 res[npth++] = tmp;
 638         }
 639         *p = res;
 640         return npth;
 641 }
 642
 643 static void exe_n_cwd_tab_completion(char *command, int type)
 644 {
 645         DIR *dir;
 646         struct dirent *next;
 647         struct stat st;
 648         char *path1[1];
 649         char **paths = path1;
 650         int npaths;
 651         int i;
 652         char *found;
 653         char *pfind = strrchr(command, '/');
 654 /*      char dirbuf[MAX_LINELEN]; */
 655 #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
 656
 657         npaths = 1;
 658         path1[0] = (char*)".";
 659
 660         if (pfind == NULL) {
 661                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 662                 npaths = path_parse(&paths, type);
 663                 pfind = command;
 664         } else {
 665                 /* dirbuf = ".../.../.../" */
 666                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 667 #if ENABLE_FEATURE_USERNAME_COMPLETION
 668                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 669                         username_tab_completion(dirbuf, dirbuf);
 670 #endif
 671                 paths[0] = dirbuf;
 672                 /* point to 'l' in "..../last_component" */
 673                 pfind++;
 674         }
 675
 676         for (i = 0; i < npaths; i++) {
 677                 dir = opendir(paths[i]);
 678                 if (!dir)
 679                         continue; /* don't print an error */
 680
 681                 while ((next = readdir(dir)) != NULL) {
 682                         int len1;
 683                         const char *str_found = next->d_name;
 684
 685                         /* matched? */
 686                         if (strncmp(str_found, pfind, strlen(pfind)))
 687                                 continue;
 688                         /* not see .name without .match */
 689                         if (*str_found == '.' && *pfind == '\0') {
 690                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 691                                         continue;
 692                                 str_found = ""; /* only "/" */
 693                         }
 694                         found = concat_path_file(paths[i], str_found);
 695                         /* hmm, remove in progress? */
 696                         /* NB: stat() first so that we see is it a directory;
 697                          * but if that fails, use lstat() so that
 698                          * we still match dangling links */
 699                         if (stat(found, &st) && lstat(found, &st))
 700                                 goto cont;
 701                         /* find with dirs? */
 702                         if (paths[i] != dirbuf)
 703                                 strcpy(found, next->d_name); /* only name */
 704
 705                         len1 = strlen(found);
 706                         found = xrealloc(found, len1 + 2);
 707                         found[len1] = '\0';
 708                         found[len1+1] = '\0';
 709
 710                         if (S_ISDIR(st.st_mode)) {
 711                                 /* name is a directory */
 712                                 if (found[len1-1] != '/') {
 713                                         found[len1] = '/';
 714                                 }
 715                         } else {
 716                                 /* not put found file if search only dirs for cd */
 717                                 if (type == FIND_DIR_ONLY)
 718                                         goto cont;
 719                         }
 720                         /* Add it to the list */
 721                         add_match(found);
 722                         continue;
 723  cont:
 724                         free(found);
 725                 }
 726                 closedir(dir);
 727         }
 728         if (paths != path1) {
 729                 free(paths[0]); /* allocated memory is only in first member */
 730                 free(paths);
 731         }
 732 #undef dirbuf
 733 }
 734
 735 /* QUOT is used on elements of int_buf[], which are bytes,
 736  * not Unicode chars. Therefore it works correctly even in Unicode mode.
 737  */
 738 #define QUOT (UCHAR_MAX+1)
 739
 740 #define int_buf (S.find_match__int_buf)
 741 #define pos_buf (S.find_match__pos_buf)
 742 /* is must be <= in */
 743 static void collapse_pos(int is, int in)
 744 {
 745         memmove(int_buf+is, int_buf+in, (MAX_LINELEN+1-in)*sizeof(int_buf[0]));
 746         memmove(pos_buf+is, pos_buf+in, (MAX_LINELEN+1-in)*sizeof(pos_buf[0]));
 747 }
 748 static NOINLINE int find_match(char *matchBuf, int *len_with_quotes)
 749 {
 750         int i, j;
 751         int command_mode;
 752         int c, c2;
 753 /*      Were local, but it uses too much stack */
 754 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 755 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 756
 757         /* set to integer dimension characters and own positions */
 758         for (i = 0;; i++) {
 759                 int_buf[i] = (unsigned char)matchBuf[i];
 760                 if (int_buf[i] == 0) {
 761                         pos_buf[i] = -1; /* end-fo-line indicator */
 762                         break;
 763                 }
 764                 pos_buf[i] = i;
 765         }
 766
 767         /* mask \+symbol and convert '\t' to ' ' */
 768         for (i = j = 0; matchBuf[i]; i++, j++)
 769                 if (matchBuf[i] == '\\') {
 770                         collapse_pos(j, j + 1);
 771                         int_buf[j] |= QUOT;
 772                         i++;
 773 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 774                         if (matchBuf[i] == '\t')  /* algorithm equivalent */
 775                                 int_buf[j] = ' ' | QUOT;
 776 #endif
 777                 }
 778 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 779                 else if (matchBuf[i] == '\t')
 780                         int_buf[j] = ' ';
 781 #endif
 782
 783         /* mask "symbols" or 'symbols' */
 784         c2 = 0;
 785         for (i = 0; int_buf[i]; i++) {
 786                 c = int_buf[i];
 787                 if (c == '\'' || c == '"') {
 788                         if (c2 == 0)
 789                                 c2 = c;
 790                         else {
 791                                 if (c == c2)
 792                                         c2 = 0;
 793                                 else
 794                                         int_buf[i] |= QUOT;
 795                         }
 796                 } else if (c2 != 0 && c != '$')
 797                         int_buf[i] |= QUOT;
 798         }
 799
 800         /* skip commands with arguments if line has commands delimiters */
 801         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 802         for (i = 0; int_buf[i]; i++) {
 803                 c = int_buf[i];
 804                 c2 = int_buf[i + 1];
 805                 j = i ? int_buf[i - 1] : -1;
 806                 command_mode = 0;
 807                 if (c == ';' || c == '&' || c == '|') {
 808                         command_mode = 1 + (c == c2);
 809                         if (c == '&') {
 810                                 if (j == '>' || j == '<')
 811                                         command_mode = 0;
 812                         } else if (c == '|' && j == '>')
 813                                 command_mode = 0;
 814                 }
 815                 if (command_mode) {
 816                         collapse_pos(0, i + command_mode);
 817                         i = -1;  /* hack incremet */
 818                 }
 819         }
 820         /* collapse `command...` */
 821         for (i = 0; int_buf[i]; i++) {
 822                 if (int_buf[i] == '`') {
 823                         for (j = i + 1; int_buf[j]; j++)
 824                                 if (int_buf[j] == '`') {
 825                                         collapse_pos(i, j + 1);
 826                                         j = 0;
 827                                         break;
 828                                 }
 829                         if (j) {
 830                                 /* not found closing ` - command mode, collapse all previous */
 831                                 collapse_pos(0, i + 1);
 832                                 break;
 833                         } else
 834                                 i--;  /* hack incremet */
 835                 }
 836         }
 837
 838         /* collapse (command...(command...)...) or {command...{command...}...} */
 839         c = 0;  /* "recursive" level */
 840         c2 = 0;
 841         for (i = 0; int_buf[i]; i++) {
 842                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 843                         if (int_buf[i] == '(')
 844                                 c++;
 845                         else
 846                                 c2++;
 847                         collapse_pos(0, i + 1);
 848                         i = -1;  /* hack incremet */
 849                 }
 850         }
 851         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) {
 852                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 853                         if (int_buf[i] == ')')
 854                                 c--;
 855                         else
 856                                 c2--;
 857                         collapse_pos(0, i + 1);
 858                         i = -1;  /* hack incremet */
 859                 }
 860         }
 861
 862         /* skip first not quote space */
 863         for (i = 0; int_buf[i]; i++)
 864                 if (int_buf[i] != ' ')
 865                         break;
 866         if (i)
 867                 collapse_pos(0, i);
 868
 869         /* set find mode for completion */
 870         command_mode = FIND_EXE_ONLY;
 871         for (i = 0; int_buf[i]; i++) {
 872                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 873                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 874                          && matchBuf[pos_buf[0]] == 'c'
 875                          && matchBuf[pos_buf[1]] == 'd'
 876                         ) {
 877                                 command_mode = FIND_DIR_ONLY;
 878                         } else {
 879                                 command_mode = FIND_FILE_ONLY;
 880                                 break;
 881                         }
 882                 }
 883         }
 884         for (i = 0; int_buf[i]; i++)
 885                 /* "strlen" */;
 886         /* find last word */
 887         for (--i; i >= 0; i--) {
 888                 c = int_buf[i];
 889                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 890                         collapse_pos(0, i + 1);
 891                         break;
 892                 }
 893         }
 894         /* skip first not quoted '\'' or '"' */
 895         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 896                 /*skip*/;
 897         /* collapse quote or unquote // or /~ */
 898         while ((int_buf[i] & ~QUOT) == '/'
 899          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 900         ) {
 901                 i++;
 902         }
 903
 904         /* set only match and destroy quotes */
 905         j = 0;
 906         for (c = 0; pos_buf[i] >= 0; i++) {
 907                 matchBuf[c++] = matchBuf[pos_buf[i]];
 908                 j = pos_buf[i] + 1;
 909         }
 910         matchBuf[c] = '\0';
 911         /* old length matchBuf with quotes symbols */
 912         *len_with_quotes = j ? j - pos_buf[0] : 0;
 913
 914         return command_mode;
 915 }
 916 #undef int_buf
 917 #undef pos_buf
 918
 919 /*
 920  * display by column (original idea from ls applet,
 921  * very optimized by me :)
 922  */
 923 static void showfiles(void)
 924 {
 925         int ncols, row;
 926         int column_width = 0;
 927         int nfiles = num_matches;
 928         int nrows = nfiles;
 929         int l;
 930
 931         /* find the longest file name - use that as the column width */
 932         for (row = 0; row < nrows; row++) {
 933                 l = unicode_strlen(matches[row]);
 934                 if (column_width < l)
 935                         column_width = l;
 936         }
 937         column_width += 2;              /* min space for columns */
 938         ncols = cmdedit_termw / column_width;
 939
 940         if (ncols > 1) {
 941                 nrows /= ncols;
 942                 if (nfiles % ncols)
 943                         nrows++;        /* round up fractionals */
 944         } else {
 945                 ncols = 1;
 946         }
 947         for (row = 0; row < nrows; row++) {
 948                 int n = row;
 949                 int nc;
 950
 951                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
 952                         printf("%s%-*s", matches[n],
 953                                 (int)(column_width - unicode_strlen(matches[n])), ""
 954                         );
 955                 }
 956                 puts(matches[n]);
 957         }
 958 }
 959
 960 static char *add_quote_for_spec_chars(char *found)
 961 {
 962         int l = 0;
 963         char *s = xzalloc((strlen(found) + 1) * 2);
 964
 965         while (*found) {
 966                 if (strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", *found))
 967                         s[l++] = '\\';
 968                 s[l++] = *found++;
 969         }
 970         /* s[l] = '\0'; - already is */
 971         return s;
 972 }
 973
 974 /* Do TAB completion */
 975 static void input_tab(smallint *lastWasTab)
 976 {
 977         if (!(state->flags & TAB_COMPLETION))
 978                 return;
 979
 980         if (!*lastWasTab) {
 981                 char *tmp, *tmp1;
 982                 size_t len_found;
 983 /*              char matchBuf[MAX_LINELEN]; */
 984 #define matchBuf (S.input_tab__matchBuf)
 985                 int find_type;
 986                 int recalc_pos;
 987 #if ENABLE_UNICODE_SUPPORT
 988                 /* cursor pos in command converted to multibyte form */
 989                 int cursor_mb;
 990 #endif
 991
 992                 *lastWasTab = TRUE;             /* flop trigger */
 993
 994                 /* Make a local copy of the string --
 995                  * up to the position of the cursor */
 996                 save_string(matchBuf, cursor + 1);
 997 #if ENABLE_UNICODE_SUPPORT
 998                 cursor_mb = strlen(matchBuf);
 999 #endif
1000                 tmp = matchBuf;
1001
1002                 find_type = find_match(matchBuf, &recalc_pos);
1003
1004                 /* Free up any memory already allocated */
1005                 free_tab_completion_data();
1006
1007 #if ENABLE_FEATURE_USERNAME_COMPLETION
1008                 /* If the word starts with `~' and there is no slash in the word,
1009                  * then try completing this word as a username. */
1010                 if (state->flags & USERNAME_COMPLETION)
1011                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
1012                                 username_tab_completion(matchBuf, NULL);
1013 #endif
1014                 /* Try to match any executable in our path and everything
1015                  * in the current working directory */
1016                 if (!matches)
1017                         exe_n_cwd_tab_completion(matchBuf, find_type);
1018                 /* Sort, then remove any duplicates found */
1019                 if (matches) {
1020                         unsigned i;
1021                         int n = 0;
1022                         qsort_string_vector(matches, num_matches);
1023                         for (i = 0; i < num_matches - 1; ++i) {
1024                                 if (matches[i] && matches[i+1]) { /* paranoia */
1025                                         if (strcmp(matches[i], matches[i+1]) == 0) {
1026                                                 free(matches[i]);
1027                                                 matches[i] = NULL; /* paranoia */
1028                                         } else {
1029                                                 matches[n++] = matches[i];
1030                                         }
1031                                 }
1032                         }
1033                         matches[n] = matches[i];
1034                         num_matches = n + 1;
1035                 }
1036                 /* Did we find exactly one match? */
1037                 if (!matches || num_matches > 1) { /* no */
1038                         beep();
1039                         if (!matches)
1040                                 return;         /* not found */
1041                         /* find minimal match */
1042                         tmp1 = xstrdup(matches[0]);
1043                         for (tmp = tmp1; *tmp; tmp++) {
1044                                 for (len_found = 1; len_found < num_matches; len_found++) {
1045                                         if (matches[len_found][tmp - tmp1] != *tmp) {
1046                                                 *tmp = '\0';
1047                                                 break;
1048                                         }
1049                                 }
1050                         }
1051                         if (*tmp1 == '\0') {        /* have unique */
1052                                 free(tmp1);
1053                                 return;
1054                         }
1055                         tmp = add_quote_for_spec_chars(tmp1);
1056                         free(tmp1);
1057                 } else {                        /* one match */
1058                         tmp = add_quote_for_spec_chars(matches[0]);
1059                         /* for next completion current found */
1060                         *lastWasTab = FALSE;
1061
1062                         len_found = strlen(tmp);
1063                         if (tmp[len_found-1] != '/') {
1064                                 tmp[len_found] = ' ';
1065                                 tmp[len_found+1] = '\0';
1066                         }
1067                 }
1068
1069                 len_found = strlen(tmp);
1070 #if !ENABLE_UNICODE_SUPPORT
1071                 /* have space to place the match? */
1072                 /* The result consists of three parts with these lengths: */
1073                 /* (cursor - recalc_pos) + len_found + (command_len - cursor) */
1074                 /* it simplifies into: */
1075                 if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
1076                         /* save tail */
1077                         strcpy(matchBuf, command_ps + cursor);
1078                         /* add match and tail */
1079                         sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
1080                         command_len = strlen(command_ps);
1081                         /* new pos */
1082                         recalc_pos = cursor - recalc_pos + len_found;
1083                         /* write out the matched command */
1084                         redraw(cmdedit_y, command_len - recalc_pos);
1085                 }
1086 #else
1087                 {
1088                         char command[MAX_LINELEN];
1089                         int len = save_string(command, sizeof(command));
1090                         /* have space to place the match? */
1091                         /* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
1092                         if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
1093                                 /* save tail */
1094                                 strcpy(matchBuf, command + cursor_mb);
1095                                 /* where do we want to have cursor after all? */
1096                                 strcpy(&command[cursor_mb - recalc_pos], tmp);
1097                                 len = load_string(command, S.maxsize);
1098                                 /* add match and tail */
1099                                 sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
1100                                 command_len = load_string(command, S.maxsize);
1101                                 /* write out the matched command */
1102                                 redraw(cmdedit_y, command_len - len);
1103                         }
1104                 }
1105 #endif
1106                 free(tmp);
1107 #undef matchBuf
1108         } else {
1109                 /* Ok -- the last char was a TAB.  Since they
1110                  * just hit TAB again, print a list of all the
1111                  * available choices... */
1112                 if (matches && num_matches > 0) {
1113                         /* changed by goto_new_line() */
1114                         int sav_cursor = cursor;
1115
1116                         /* Go to the next line */
1117                         goto_new_line();
1118                         showfiles();
1119                         redraw(0, command_len - sav_cursor);
1120                 }
1121         }
1122 }
1123
1124 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
1125
1126
1127 line_input_t* FAST_FUNC new_line_input_t(int flags)
1128 {
1129         line_input_t *n = xzalloc(sizeof(*n));
1130         n->flags = flags;
1131         return n;
1132 }
1133
1134
1135 #if MAX_HISTORY > 0
1136
1137 static void save_command_ps_at_cur_history(void)
1138 {
1139         if (command_ps[0] != BB_NUL) {
1140                 int cur = state->cur_history;
1141                 free(state->history[cur]);
1142
1143 # if ENABLE_UNICODE_SUPPORT
1144                 {
1145                         char tbuf[MAX_LINELEN];
1146                         save_string(tbuf, sizeof(tbuf));
1147                         state->history[cur] = xstrdup(tbuf);
1148                 }
1149 # else
1150                 state->history[cur] = xstrdup(command_ps);
1151 # endif
1152         }
1153 }
1154
1155 /* state->flags is already checked to be nonzero */
1156 static int get_previous_history(void)
1157 {
1158         if ((state->flags & DO_HISTORY) && state->cur_history) {
1159                 save_command_ps_at_cur_history();
1160                 state->cur_history--;
1161                 return 1;
1162         }
1163         beep();
1164         return 0;
1165 }
1166
1167 static int get_next_history(void)
1168 {
1169         if (state->flags & DO_HISTORY) {
1170                 if (state->cur_history < state->cnt_history) {
1171                         save_command_ps_at_cur_history(); /* save the current history line */
1172                         return ++state->cur_history;
1173                 }
1174         }
1175         beep();
1176         return 0;
1177 }
1178
1179 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1180 /* We try to ensure that concurrent additions to the history
1181  * do not overwrite each other.
1182  * Otherwise shell users get unhappy.
1183  *
1184  * History file is trimmed lazily, when it grows several times longer
1185  * than configured MAX_HISTORY lines.
1186  */
1187
1188 static void free_line_input_t(line_input_t *n)
1189 {
1190         int i = n->cnt_history;
1191         while (i > 0)
1192                 free(n->history[--i]);
1193         free(n);
1194 }
1195
1196 /* state->flags is already checked to be nonzero */
1197 static void load_history(line_input_t *st_parm)
1198 {
1199         char *temp_h[MAX_HISTORY];
1200         char *line;
1201         FILE *fp;
1202         unsigned idx, i, line_len;
1203
1204         /* NB: do not trash old history if file can't be opened */
1205
1206         fp = fopen_for_read(st_parm->hist_file);
1207         if (fp) {
1208                 /* clean up old history */
1209                 for (idx = st_parm->cnt_history; idx > 0;) {
1210                         idx--;
1211                         free(st_parm->history[idx]);
1212                         st_parm->history[idx] = NULL;
1213                 }
1214
1215                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1216                 memset(temp_h, 0, sizeof(temp_h));
1217                 st_parm->cnt_history_in_file = idx = 0;
1218                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1219                         if (line[0] == '\0') {
1220                                 free(line);
1221                                 continue;
1222                         }
1223                         free(temp_h[idx]);
1224                         temp_h[idx] = line;
1225                         st_parm->cnt_history_in_file++;
1226                         idx++;
1227                         if (idx == MAX_HISTORY)
1228                                 idx = 0;
1229                 }
1230                 fclose(fp);
1231
1232                 /* find first non-NULL temp_h[], if any */
1233                 if (st_parm->cnt_history_in_file) {
1234                         while (temp_h[idx] == NULL) {
1235                                 idx++;
1236                                 if (idx == MAX_HISTORY)
1237                                         idx = 0;
1238                         }
1239                 }
1240
1241                 /* copy temp_h[] to st_parm->history[] */
1242                 for (i = 0; i < MAX_HISTORY;) {
1243                         line = temp_h[idx];
1244                         if (!line)
1245                                 break;
1246                         idx++;
1247                         if (idx == MAX_HISTORY)
1248                                 idx = 0;
1249                         line_len = strlen(line);
1250                         if (line_len >= MAX_LINELEN)
1251                                 line[MAX_LINELEN-1] = '\0';
1252                         st_parm->history[i++] = line;
1253                 }
1254                 st_parm->cnt_history = i;
1255         }
1256 }
1257
1258 /* state->flags is already checked to be nonzero */
1259 static void save_history(char *str)
1260 {
1261         int fd;
1262         int len, len2;
1263
1264         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0666);
1265         if (fd < 0)
1266                 return;
1267         xlseek(fd, 0, SEEK_END); /* paranoia */
1268         len = strlen(str);
1269         str[len] = '\n'; /* we (try to) do atomic write */
1270         len2 = full_write(fd, str, len + 1);
1271         str[len] = '\0';
1272         close(fd);
1273         if (len2 != len + 1)
1274                 return; /* "wtf?" */
1275
1276         /* did we write so much that history file needs trimming? */
1277         state->cnt_history_in_file++;
1278         if (state->cnt_history_in_file > MAX_HISTORY * 4) {
1279                 FILE *fp;
1280                 char *new_name;
1281                 line_input_t *st_temp;
1282                 int i;
1283
1284                 /* we may have concurrently written entries from others.
1285                  * load them */
1286                 st_temp = new_line_input_t(state->flags);
1287                 st_temp->hist_file = state->hist_file;
1288                 load_history(st_temp);
1289
1290                 /* write out temp file and replace hist_file atomically */
1291                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1292                 fp = fopen_for_write(new_name);
1293                 if (fp) {
1294                         for (i = 0; i < st_temp->cnt_history; i++)
1295                                 fprintf(fp, "%s\n", st_temp->history[i]);
1296                         fclose(fp);
1297                         if (rename(new_name, state->hist_file) == 0)
1298                                 state->cnt_history_in_file = st_temp->cnt_history;
1299                 }
1300                 free(new_name);
1301                 free_line_input_t(st_temp);
1302         }
1303 }
1304 # else
1305 #  define load_history(a) ((void)0)
1306 #  define save_history(a) ((void)0)
1307 # endif /* FEATURE_COMMAND_SAVEHISTORY */
1308
1309 static void remember_in_history(char *str)
1310 {
1311         int i;
1312
1313         if (!(state->flags & DO_HISTORY))
1314                 return;
1315         if (str[0] == '\0')
1316                 return;
1317         i = state->cnt_history;
1318         /* Don't save dupes */
1319         if (i && strcmp(state->history[i-1], str) == 0)
1320                 return;
1321
1322         free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1323         state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1324
1325         /* If history[] is full, remove the oldest command */
1326         /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1327         if (i >= MAX_HISTORY) {
1328                 free(state->history[0]);
1329                 for (i = 0; i < MAX_HISTORY-1; i++)
1330                         state->history[i] = state->history[i+1];
1331                 /* i == MAX_HISTORY-1 */
1332         }
1333         /* i <= MAX_HISTORY-1 */
1334         state->history[i++] = xstrdup(str);
1335         /* i <= MAX_HISTORY */
1336         state->cur_history = i;
1337         state->cnt_history = i;
1338 # if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
1339         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1340                 save_history(str);
1341 # endif
1342         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1343 }
1344
1345 #else /* MAX_HISTORY == 0 */
1346 # define remember_in_history(a) ((void)0)
1347 #endif /* MAX_HISTORY */
1348
1349
1350 #if ENABLE_FEATURE_EDITING_VI
1351 /*
1352  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1353  */
1354 static void
1355 vi_Word_motion(int eat)
1356 {
1357         CHAR_T *command = command_ps;
1358
1359         while (cursor < command_len && !BB_isspace(command[cursor]))
1360                 input_forward();
1361         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1362                 input_forward();
1363 }
1364
1365 static void
1366 vi_word_motion(int eat)
1367 {
1368         CHAR_T *command = command_ps;
1369
1370         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1371                 while (cursor < command_len
1372                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1373                 ) {
1374                         input_forward();
1375                 }
1376         } else if (BB_ispunct(command[cursor])) {
1377                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1378                         input_forward();
1379         }
1380
1381         if (cursor < command_len)
1382                 input_forward();
1383
1384         if (eat) {
1385                 while (cursor < command_len && BB_isspace(command[cursor]))
1386                         input_forward();
1387         }
1388 }
1389
1390 static void
1391 vi_End_motion(void)
1392 {
1393         CHAR_T *command = command_ps;
1394
1395         input_forward();
1396         while (cursor < command_len && BB_isspace(command[cursor]))
1397                 input_forward();
1398         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1399                 input_forward();
1400 }
1401
1402 static void
1403 vi_end_motion(void)
1404 {
1405         CHAR_T *command = command_ps;
1406
1407         if (cursor >= command_len-1)
1408                 return;
1409         input_forward();
1410         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1411                 input_forward();
1412         if (cursor >= command_len-1)
1413                 return;
1414         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1415                 while (cursor < command_len-1
1416                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1417                 ) {
1418                         input_forward();
1419                 }
1420         } else if (BB_ispunct(command[cursor])) {
1421                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1422                         input_forward();
1423         }
1424 }
1425
1426 static void
1427 vi_Back_motion(void)
1428 {
1429         CHAR_T *command = command_ps;
1430
1431         while (cursor > 0 && BB_isspace(command[cursor-1]))
1432                 input_backward(1);
1433         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1434                 input_backward(1);
1435 }
1436
1437 static void
1438 vi_back_motion(void)
1439 {
1440         CHAR_T *command = command_ps;
1441
1442         if (cursor <= 0)
1443                 return;
1444         input_backward(1);
1445         while (cursor > 0 && BB_isspace(command[cursor]))
1446                 input_backward(1);
1447         if (cursor <= 0)
1448                 return;
1449         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1450                 while (cursor > 0
1451                  && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1452                 ) {
1453                         input_backward(1);
1454                 }
1455         } else if (BB_ispunct(command[cursor])) {
1456                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1457                         input_backward(1);
1458         }
1459 }
1460 #endif
1461
1462 /* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1463 static void ctrl_left(void)
1464 {
1465         CHAR_T *command = command_ps;
1466
1467         while (1) {
1468                 CHAR_T c;
1469
1470                 input_backward(1);
1471                 if (cursor == 0)
1472                         break;
1473                 c = command[cursor];
1474                 if (c != ' ' && !BB_ispunct(c)) {
1475                         /* we reached a "word" delimited by spaces/punct.
1476                          * go to its beginning */
1477                         while (1) {
1478                                 c = command[cursor - 1];
1479                                 if (c == ' ' || BB_ispunct(c))
1480                                         break;
1481                                 input_backward(1);
1482                                 if (cursor == 0)
1483                                         break;
1484                         }
1485                         break;
1486                 }
1487         }
1488 }
1489 static void ctrl_right(void)
1490 {
1491         CHAR_T *command = command_ps;
1492
1493         while (1) {
1494                 CHAR_T c;
1495
1496                 c = command[cursor];
1497                 if (c == BB_NUL)
1498                         break;
1499                 if (c != ' ' && !BB_ispunct(c)) {
1500                         /* we reached a "word" delimited by spaces/punct.
1501                          * go to its end + 1 */
1502                         while (1) {
1503                                 input_forward();
1504                                 c = command[cursor];
1505                                 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1506                                         break;
1507                         }
1508                         break;
1509                 }
1510                 input_forward();
1511         }
1512 }
1513
1514
1515 /*
1516  * read_line_input and its helpers
1517  */
1518
1519 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1520 static void ask_terminal(void)
1521 {
1522         /* Ask terminal where is the cursor now.
1523          * lineedit_read_key handles response and corrects
1524          * our idea of current cursor position.
1525          * Testcase: run "echo -n long_line_long_line_long_line",
1526          * then type in a long, wrapping command and try to
1527          * delete it using backspace key.
1528          * Note: we print it _after_ prompt, because
1529          * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1530          */
1531         /* Problem: if there is buffered input on stdin,
1532          * the response will be delivered later,
1533          * possibly to an unsuspecting application.
1534          * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1535          * Result:
1536          * ~/srcdevel/bbox/fix/busybox.t4 #
1537          * ~/srcdevel/bbox/fix/busybox.t4 #
1538          * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
1539          * ~/srcdevel/bbox/fix/busybox.t4 #
1540          *
1541          * Checking for input with poll only makes the race narrower,
1542          * I still can trigger it. Strace:
1543          *
1544          * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1545          * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
1546          * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
1547          * poll([{fd=0, events=POLLIN}], 1, 4294967295) = 1 ([{fd=0, revents=POLLIN}])
1548          * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
1549          */
1550         struct pollfd pfd;
1551
1552         pfd.fd = STDIN_FILENO;
1553         pfd.events = POLLIN;
1554         if (safe_poll(&pfd, 1, 0) == 0) {
1555                 S.sent_ESC_br6n = 1;
1556                 out1str("\033" "[6n");
1557                 fflush_all(); /* make terminal see it ASAP! */
1558         }
1559 }
1560 #else
1561 #define ask_terminal() ((void)0)
1562 #endif
1563
1564 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1565 static void parse_and_put_prompt(const char *prmt_ptr)
1566 {
1567         cmdedit_prompt = prmt_ptr;
1568         cmdedit_prmt_len = strlen(prmt_ptr);
1569         put_prompt();
1570 }
1571 #else
1572 static void parse_and_put_prompt(const char *prmt_ptr)
1573 {
1574         int prmt_len = 0;
1575         size_t cur_prmt_len = 0;
1576         char flg_not_length = '[';
1577         char *prmt_mem_ptr = xzalloc(1);
1578         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1579         char cbuf[2];
1580         char c;
1581         char *pbuf;
1582
1583         cmdedit_prmt_len = 0;
1584
1585         if (!cwd_buf) {
1586                 cwd_buf = (char *)bb_msg_unknown;
1587         }
1588
1589         cbuf[1] = '\0'; /* never changes */
1590
1591         while (*prmt_ptr) {
1592                 char *free_me = NULL;
1593
1594                 pbuf = cbuf;
1595                 c = *prmt_ptr++;
1596                 if (c == '\\') {
1597                         const char *cp = prmt_ptr;
1598                         int l;
1599
1600                         c = bb_process_escape_sequence(&prmt_ptr);
1601                         if (prmt_ptr == cp) {
1602                                 if (*cp == '\0')
1603                                         break;
1604                                 c = *prmt_ptr++;
1605
1606                                 switch (c) {
1607 # if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1608                                 case 'u':
1609                                         pbuf = user_buf ? user_buf : (char*)"";
1610                                         break;
1611 # endif
1612                                 case 'h':
1613                                         pbuf = free_me = safe_gethostname();
1614                                         *strchrnul(pbuf, '.') = '\0';
1615                                         break;
1616                                 case '$':
1617                                         c = (geteuid() == 0 ? '#' : '$');
1618                                         break;
1619 # if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1620                                 case 'w':
1621                                         /* /home/user[/something] -> ~[/something] */
1622                                         pbuf = cwd_buf;
1623                                         l = strlen(home_pwd_buf);
1624                                         if (l != 0
1625                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1626                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1627                                          && strlen(cwd_buf + l) < PATH_MAX
1628                                         ) {
1629                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1630                                         }
1631                                         break;
1632 # endif
1633                                 case 'W':
1634                                         pbuf = cwd_buf;
1635                                         cp = strrchr(pbuf, '/');
1636                                         if (cp != NULL && cp != pbuf)
1637                                                 pbuf += (cp-pbuf) + 1;
1638                                         break;
1639                                 case '!':
1640                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1641                                         break;
1642                                 case 'e': case 'E':     /* \e \E = \033 */
1643                                         c = '\033';
1644                                         break;
1645                                 case 'x': case 'X': {
1646                                         char buf2[4];
1647                                         for (l = 0; l < 3;) {
1648                                                 unsigned h;
1649                                                 buf2[l++] = *prmt_ptr;
1650                                                 buf2[l] = '\0';
1651                                                 h = strtoul(buf2, &pbuf, 16);
1652                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1653                                                         buf2[--l] = '\0';
1654                                                         break;
1655                                                 }
1656                                                 prmt_ptr++;
1657                                         }
1658                                         c = (char)strtoul(buf2, NULL, 16);
1659                                         if (c == 0)
1660                                                 c = '?';
1661                                         pbuf = cbuf;
1662                                         break;
1663                                 }
1664                                 case '[': case ']':
1665                                         if (c == flg_not_length) {
1666                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1667                                                 continue;
1668                                         }
1669                                         break;
1670                                 } /* switch */
1671                         } /* if */
1672                 } /* if */
1673                 cbuf[0] = c;
1674                 cur_prmt_len = strlen(pbuf);
1675                 prmt_len += cur_prmt_len;
1676                 if (flg_not_length != ']')
1677                         cmdedit_prmt_len += cur_prmt_len;
1678                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1679                 free(free_me);
1680         } /* while */
1681
1682         if (cwd_buf != (char *)bb_msg_unknown)
1683                 free(cwd_buf);
1684         cmdedit_prompt = prmt_mem_ptr;
1685         put_prompt();
1686 }
1687 #endif
1688
1689 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1690 {
1691         cmdedit_termw = w;
1692         if (redraw_flg) {
1693                 /* new y for current cursor */
1694                 int new_y = (cursor + cmdedit_prmt_len) / w;
1695                 /* redraw */
1696                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1697                 fflush_all();
1698         }
1699 }
1700
1701 static void win_changed(int nsig)
1702 {
1703         unsigned width;
1704         get_terminal_width_height(0, &width, NULL);
1705         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1706         if (nsig == SIGWINCH)
1707                 signal(SIGWINCH, win_changed); /* rearm ourself */
1708 }
1709
1710 static int lineedit_read_key(char *read_key_buffer)
1711 {
1712         int64_t ic;
1713         int timeout = -1;
1714 #if ENABLE_UNICODE_SUPPORT
1715         char unicode_buf[MB_CUR_MAX + 1];
1716         int unicode_idx = 0;
1717 #endif
1718
1719         while (1) {
1720                 /* Wait for input. TIMEOUT = -1 makes read_key wait even
1721                  * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
1722                  * insist on full MB_CUR_MAX buffer to declare input like
1723                  * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
1724                  *
1725                  * Note: read_key sets errno to 0 on success.
1726                  */
1727                 ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
1728                 if (errno) {
1729 #if ENABLE_UNICODE_SUPPORT
1730                         if (errno == EAGAIN && unicode_idx != 0)
1731                                 goto pushback;
1732 #endif
1733                         break;
1734                 }
1735
1736 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1737                 if ((int32_t)ic == KEYCODE_CURSOR_POS
1738                  && S.sent_ESC_br6n
1739                 ) {
1740                         S.sent_ESC_br6n = 0;
1741                         if (cursor == 0) { /* otherwise it may be bogus */
1742                                 int col = ((ic >> 32) & 0x7fff) - 1;
1743                                 if (col > cmdedit_prmt_len) {
1744                                         cmdedit_x += (col - cmdedit_prmt_len);
1745                                         while (cmdedit_x >= cmdedit_termw) {
1746                                                 cmdedit_x -= cmdedit_termw;
1747                                                 cmdedit_y++;
1748                                         }
1749                                 }
1750                         }
1751                         continue;
1752                 }
1753 #endif
1754
1755 #if ENABLE_UNICODE_SUPPORT
1756                 if (unicode_status == UNICODE_ON) {
1757                         wchar_t wc;
1758
1759                         if ((int32_t)ic < 0) /* KEYCODE_xxx */
1760                                 break;
1761                         // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
1762
1763                         unicode_buf[unicode_idx++] = ic;
1764                         unicode_buf[unicode_idx] = '\0';
1765                         if (mbstowcs(&wc, unicode_buf, 1) != 1) {
1766                                 /* Not (yet?) a valid unicode char */
1767                                 if (unicode_idx < MB_CUR_MAX) {
1768                                         timeout = 50;
1769                                         continue;
1770                                 }
1771  pushback:
1772                                 /* Invalid sequence. Save all "bad bytes" except first */
1773                                 read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
1774 # if !ENABLE_UNICODE_PRESERVE_BROKEN
1775                                 ic = CONFIG_SUBST_WCHAR;
1776 # else
1777                                 ic = unicode_mark_inv_wchar(unicode_buf[0]);
1778 # endif
1779                         } else {
1780                                 /* Valid unicode char, return its code */
1781                                 ic = wc;
1782                         }
1783                 }
1784 #endif
1785                 break;
1786         }
1787
1788         return ic;
1789 }
1790
1791 #if ENABLE_UNICODE_BIDI_SUPPORT
1792 static int isrtl_str(void)
1793 {
1794         int idx = cursor;
1795
1796         while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
1797                 idx++;
1798         return unicode_bidi_isrtl(command_ps[idx]);
1799 }
1800 #else
1801 # define isrtl_str() 0
1802 #endif
1803
1804 /* leave out the "vi-mode"-only case labels if vi editing isn't
1805  * configured. */
1806 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
1807
1808 /* convert uppercase ascii to equivalent control char, for readability */
1809 #undef CTRL
1810 #define CTRL(a) ((a) & ~0x40)
1811
1812 /* maxsize must be >= 2.
1813  * Returns:
1814  * -1 on read errors or EOF, or on bare Ctrl-D,
1815  * 0  on ctrl-C (the line entered is still returned in 'command'),
1816  * >0 length of input string, including terminating '\n'
1817  */
1818 int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1819 {
1820         int len;
1821 #if ENABLE_FEATURE_TAB_COMPLETION
1822         smallint lastWasTab = FALSE;
1823 #endif
1824         smallint break_out = 0;
1825 #if ENABLE_FEATURE_EDITING_VI
1826         smallint vi_cmdmode = 0;
1827 #endif
1828         struct termios initial_settings;
1829         struct termios new_settings;
1830         char read_key_buffer[KEYCODE_BUFFER_SIZE];
1831
1832         INIT_S();
1833
1834         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1835          || !(initial_settings.c_lflag & ECHO)
1836         ) {
1837                 /* Happens when e.g. stty -echo was run before */
1838                 parse_and_put_prompt(prompt);
1839                 /* fflush_all(); - done by parse_and_put_prompt */
1840                 if (fgets(command, maxsize, stdin) == NULL)
1841                         len = -1; /* EOF or error */
1842                 else
1843                         len = strlen(command);
1844                 DEINIT_S();
1845                 return len;
1846         }
1847
1848         init_unicode();
1849
1850 // FIXME: audit & improve this
1851         if (maxsize > MAX_LINELEN)
1852                 maxsize = MAX_LINELEN;
1853         S.maxsize = maxsize;
1854
1855         /* With null flags, no other fields are ever used */
1856         state = st ? st : (line_input_t*) &const_int_0;
1857 #if MAX_HISTORY > 0
1858 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1859         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1860                 if (state->cnt_history == 0)
1861                         load_history(state);
1862 # endif
1863         if (state->flags & DO_HISTORY)
1864                 state->cur_history = state->cnt_history;
1865 #endif
1866
1867         /* prepare before init handlers */
1868         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1869         command_len = 0;
1870 #if ENABLE_UNICODE_SUPPORT
1871         command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
1872 #else
1873         command_ps = command;
1874         command[0] = '\0';
1875 #endif
1876 #define command command_must_not_be_used
1877
1878         new_settings = initial_settings;
1879         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1880         /* Turn off echoing and CTRL-C, so we can trap it */
1881         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1882         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1883         new_settings.c_cc[VMIN] = 1;
1884         new_settings.c_cc[VTIME] = 0;
1885         /* Turn off CTRL-C, so we can trap it */
1886 #ifndef _POSIX_VDISABLE
1887 # define _POSIX_VDISABLE '\0'
1888 #endif
1889         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1890         tcsetattr_stdin_TCSANOW(&new_settings);
1891
1892         /* Now initialize things */
1893         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1894         win_changed(0); /* do initial resizing */
1895 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1896         {
1897                 struct passwd *entry;
1898
1899                 entry = getpwuid(geteuid());
1900                 if (entry) {
1901                         user_buf = xstrdup(entry->pw_name);
1902                         home_pwd_buf = xstrdup(entry->pw_dir);
1903                 }
1904         }
1905 #endif
1906
1907 #if 0
1908         for (i = 0; i <= MAX_HISTORY; i++)
1909                 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
1910         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
1911 #endif
1912
1913         /* Print out the command prompt, optionally ask where cursor is */
1914         parse_and_put_prompt(prompt);
1915         ask_terminal();
1916
1917         read_key_buffer[0] = 0;
1918         while (1) {
1919                 /*
1920                  * The emacs and vi modes share much of the code in the big
1921                  * command loop.  Commands entered when in vi's command mode
1922                  * (aka "escape mode") get an extra bit added to distinguish
1923                  * them - this keeps them from being self-inserted. This
1924                  * clutters the big switch a bit, but keeps all the code
1925                  * in one place.
1926                  */
1927                 enum {
1928                         VI_CMDMODE_BIT = 0x40000000,
1929                         /* 0x80000000 bit flags KEYCODE_xxx */
1930                 };
1931                 int32_t ic, ic_raw;
1932
1933                 fflush_all();
1934                 ic = ic_raw = lineedit_read_key(read_key_buffer);
1935
1936 #if ENABLE_FEATURE_EDITING_VI
1937                 newdelflag = 1;
1938                 if (vi_cmdmode) {
1939                         /* btw, since KEYCODE_xxx are all < 0, this doesn't
1940                          * change ic if it contains one of them: */
1941                         ic |= VI_CMDMODE_BIT;
1942                 }
1943 #endif
1944
1945                 switch (ic) {
1946                 case '\n':
1947                 case '\r':
1948                 vi_case('\n'|VI_CMDMODE_BIT:)
1949                 vi_case('\r'|VI_CMDMODE_BIT:)
1950                         /* Enter */
1951                         goto_new_line();
1952                         break_out = 1;
1953                         break;
1954                 case CTRL('A'):
1955                 vi_case('0'|VI_CMDMODE_BIT:)
1956                         /* Control-a -- Beginning of line */
1957                         input_backward(cursor);
1958                         break;
1959                 case CTRL('B'):
1960                 vi_case('h'|VI_CMDMODE_BIT:)
1961                 vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
1962                 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
1963                         input_backward(1); /* Move back one character */
1964                         break;
1965                 case CTRL('E'):
1966                 vi_case('$'|VI_CMDMODE_BIT:)
1967                         /* Control-e -- End of line */
1968                         put_till_end_and_adv_cursor();
1969                         break;
1970                 case CTRL('F'):
1971                 vi_case('l'|VI_CMDMODE_BIT:)
1972                 vi_case(' '|VI_CMDMODE_BIT:)
1973                         input_forward(); /* Move forward one character */
1974                         break;
1975                 case '\b':   /* ^H */
1976                 case '\x7f': /* DEL */
1977                         if (!isrtl_str())
1978                                 input_backspace();
1979                         else
1980                                 input_delete(0);
1981                         break;
1982                 case KEYCODE_DELETE:
1983                         if (!isrtl_str())
1984                                 input_delete(0);
1985                         else
1986                                 input_backspace();
1987                         break;
1988 #if ENABLE_FEATURE_TAB_COMPLETION
1989                 case '\t':
1990                         input_tab(&lastWasTab);
1991                         break;
1992 #endif
1993                 case CTRL('K'):
1994                         /* Control-k -- clear to end of line */
1995                         command_ps[cursor] = BB_NUL;
1996                         command_len = cursor;
1997                         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
1998                         break;
1999                 case CTRL('L'):
2000                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
2001                         /* Control-l -- clear screen */
2002                         printf("\033[H"); /* cursor to top,left */
2003                         redraw(0, command_len - cursor);
2004                         break;
2005 #if MAX_HISTORY > 0
2006                 case CTRL('N'):
2007                 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
2008                 vi_case('j'|VI_CMDMODE_BIT:)
2009                         /* Control-n -- Get next command in history */
2010                         if (get_next_history())
2011                                 goto rewrite_line;
2012                         break;
2013                 case CTRL('P'):
2014                 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
2015                 vi_case('k'|VI_CMDMODE_BIT:)
2016                         /* Control-p -- Get previous command from history */
2017                         if (get_previous_history())
2018                                 goto rewrite_line;
2019                         break;
2020 #endif
2021                 case CTRL('U'):
2022                 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
2023                         /* Control-U -- Clear line before cursor */
2024                         if (cursor) {
2025                                 command_len -= cursor;
2026                                 memmove(command_ps, command_ps + cursor,
2027                                         (command_len + 1) * sizeof(command_ps[0]));
2028                                 redraw(cmdedit_y, command_len);
2029                         }
2030                         break;
2031                 case CTRL('W'):
2032                 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
2033                         /* Control-W -- Remove the last word */
2034                         while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
2035                                 input_backspace();
2036                         while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
2037                                 input_backspace();
2038                         break;
2039
2040 #if ENABLE_FEATURE_EDITING_VI
2041                 case 'i'|VI_CMDMODE_BIT:
2042                         vi_cmdmode = 0;
2043                         break;
2044                 case 'I'|VI_CMDMODE_BIT:
2045                         input_backward(cursor);
2046                         vi_cmdmode = 0;
2047                         break;
2048                 case 'a'|VI_CMDMODE_BIT:
2049                         input_forward();
2050                         vi_cmdmode = 0;
2051                         break;
2052                 case 'A'|VI_CMDMODE_BIT:
2053                         put_till_end_and_adv_cursor();
2054                         vi_cmdmode = 0;
2055                         break;
2056                 case 'x'|VI_CMDMODE_BIT:
2057                         input_delete(1);
2058                         break;
2059                 case 'X'|VI_CMDMODE_BIT:
2060                         if (cursor > 0) {
2061                                 input_backward(1);
2062                                 input_delete(1);
2063                         }
2064                         break;
2065                 case 'W'|VI_CMDMODE_BIT:
2066                         vi_Word_motion(1);
2067                         break;
2068                 case 'w'|VI_CMDMODE_BIT:
2069                         vi_word_motion(1);
2070                         break;
2071                 case 'E'|VI_CMDMODE_BIT:
2072                         vi_End_motion();
2073                         break;
2074                 case 'e'|VI_CMDMODE_BIT:
2075                         vi_end_motion();
2076                         break;
2077                 case 'B'|VI_CMDMODE_BIT:
2078                         vi_Back_motion();
2079                         break;
2080                 case 'b'|VI_CMDMODE_BIT:
2081                         vi_back_motion();
2082                         break;
2083                 case 'C'|VI_CMDMODE_BIT:
2084                         vi_cmdmode = 0;
2085                         /* fall through */
2086                 case 'D'|VI_CMDMODE_BIT:
2087                         goto clear_to_eol;
2088
2089                 case 'c'|VI_CMDMODE_BIT:
2090                         vi_cmdmode = 0;
2091                         /* fall through */
2092                 case 'd'|VI_CMDMODE_BIT: {
2093                         int nc, sc;
2094
2095                         ic = lineedit_read_key(read_key_buffer);
2096                         if (errno) /* error */
2097                                 goto prepare_to_die;
2098                         if (ic == ic_raw) { /* "cc", "dd" */
2099                                 input_backward(cursor);
2100                                 goto clear_to_eol;
2101                                 break;
2102                         }
2103
2104                         sc = cursor;
2105                         switch (ic) {
2106                         case 'w':
2107                         case 'W':
2108                         case 'e':
2109                         case 'E':
2110                                 switch (ic) {
2111                                 case 'w':   /* "dw", "cw" */
2112                                         vi_word_motion(vi_cmdmode);
2113                                         break;
2114                                 case 'W':   /* 'dW', 'cW' */
2115                                         vi_Word_motion(vi_cmdmode);
2116                                         break;
2117                                 case 'e':   /* 'de', 'ce' */
2118                                         vi_end_motion();
2119                                         input_forward();
2120                                         break;
2121                                 case 'E':   /* 'dE', 'cE' */
2122                                         vi_End_motion();
2123                                         input_forward();
2124                                         break;
2125                                 }
2126                                 nc = cursor;
2127                                 input_backward(cursor - sc);
2128                                 while (nc-- > cursor)
2129                                         input_delete(1);
2130                                 break;
2131                         case 'b':  /* "db", "cb" */
2132                         case 'B':  /* implemented as B */
2133                                 if (ic == 'b')
2134                                         vi_back_motion();
2135                                 else
2136                                         vi_Back_motion();
2137                                 while (sc-- > cursor)
2138                                         input_delete(1);
2139                                 break;
2140                         case ' ':  /* "d ", "c " */
2141                                 input_delete(1);
2142                                 break;
2143                         case '$':  /* "d$", "c$" */
2144  clear_to_eol:
2145                                 while (cursor < command_len)
2146                                         input_delete(1);
2147                                 break;
2148                         }
2149                         break;
2150                 }
2151                 case 'p'|VI_CMDMODE_BIT:
2152                         input_forward();
2153                         /* fallthrough */
2154                 case 'P'|VI_CMDMODE_BIT:
2155                         put();
2156                         break;
2157                 case 'r'|VI_CMDMODE_BIT:
2158 //FIXME: unicode case?
2159                         ic = lineedit_read_key(read_key_buffer);
2160                         if (errno) /* error */
2161                                 goto prepare_to_die;
2162                         if (ic < ' ' || ic > 255) {
2163                                 beep();
2164                         } else {
2165                                 command_ps[cursor] = ic;
2166                                 bb_putchar(ic);
2167                                 bb_putchar('\b');
2168                         }
2169                         break;
2170                 case '\x1b': /* ESC */
2171                         if (state->flags & VI_MODE) {
2172                                 /* insert mode --> command mode */
2173                                 vi_cmdmode = 1;
2174                                 input_backward(1);
2175                         }
2176                         break;
2177 #endif /* FEATURE_COMMAND_EDITING_VI */
2178
2179 #if MAX_HISTORY > 0
2180                 case KEYCODE_UP:
2181                         if (get_previous_history())
2182                                 goto rewrite_line;
2183                         beep();
2184                         break;
2185                 case KEYCODE_DOWN:
2186                         if (!get_next_history())
2187                                 break;
2188  rewrite_line:
2189                         /* Rewrite the line with the selected history item */
2190                         /* change command */
2191                         command_len = load_string(state->history[state->cur_history] ?
2192                                         state->history[state->cur_history] : "", maxsize);
2193                         /* redraw and go to eol (bol, in vi) */
2194                         redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2195                         break;
2196 #endif
2197                 case KEYCODE_RIGHT:
2198                         input_forward();
2199                         break;
2200                 case KEYCODE_LEFT:
2201                         input_backward(1);
2202                         break;
2203                 case KEYCODE_CTRL_LEFT:
2204                         ctrl_left();
2205                         break;
2206                 case KEYCODE_CTRL_RIGHT:
2207                         ctrl_right();
2208                         break;
2209                 case KEYCODE_HOME:
2210                         input_backward(cursor);
2211                         break;
2212                 case KEYCODE_END:
2213                         put_till_end_and_adv_cursor();
2214                         break;
2215
2216                 default:
2217                         if (initial_settings.c_cc[VINTR] != 0
2218                          && ic_raw == initial_settings.c_cc[VINTR]
2219                         ) {
2220                                 /* Ctrl-C (usually) - stop gathering input */
2221                                 goto_new_line();
2222                                 command_len = 0;
2223                                 break_out = -1; /* "do not append '\n'" */
2224                                 break;
2225                         }
2226                         if (initial_settings.c_cc[VEOF] != 0
2227                          && ic_raw == initial_settings.c_cc[VEOF]
2228                         ) {
2229                                 /* Ctrl-D (usually) - delete one character,
2230                                  * or exit if len=0 and no chars to delete */
2231                                 if (command_len == 0) {
2232                                         errno = 0;
2233 #if ENABLE_FEATURE_EDITING_VI
2234  prepare_to_die:
2235 #endif
2236                                         break_out = command_len = -1;
2237                                         break;
2238                                 }
2239                                 input_delete(0);
2240                                 break;
2241                         }
2242 //                      /* Control-V -- force insert of next char */
2243 //                      if (c == CTRL('V')) {
2244 //                              if (safe_read(STDIN_FILENO, &c, 1) < 1)
2245 //                                      goto prepare_to_die;
2246 //                              if (c == 0) {
2247 //                                      beep();
2248 //                                      break;
2249 //                              }
2250 //                      }
2251                         if (ic < ' '
2252                          || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2253                          || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2254                         ) {
2255                                 /* If VI_CMDMODE_BIT is set, ic is >= 256
2256                                  * and vi mode ignores unexpected chars.
2257                                  * Otherwise, we are here if ic is a
2258                                  * control char or an unhandled ESC sequence,
2259                                  * which is also ignored.
2260                                  */
2261                                 break;
2262                         }
2263                         if ((int)command_len >= (maxsize - 2)) {
2264                                 /* Not enough space for the char and EOL */
2265                                 break;
2266                         }
2267
2268                         command_len++;
2269                         if (cursor == (command_len - 1)) {
2270                                 /* We are at the end, append */
2271                                 command_ps[cursor] = ic;
2272                                 command_ps[cursor + 1] = BB_NUL;
2273                                 put_cur_glyph_and_inc_cursor();
2274                                 if (unicode_bidi_isrtl(ic))
2275                                         input_backward(1);
2276                         } else {
2277                                 /* In the middle, insert */
2278                                 int sc = cursor;
2279
2280                                 memmove(command_ps + sc + 1, command_ps + sc,
2281                                         (command_len - sc) * sizeof(command_ps[0]));
2282                                 command_ps[sc] = ic;
2283                                 /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
2284                                 if (!isrtl_str())
2285                                         sc++; /* no */
2286                                 put_till_end_and_adv_cursor();
2287                                 /* to prev x pos + 1 */
2288                                 input_backward(cursor - sc);
2289                         }
2290                         break;
2291                 } /* switch (ic) */
2292
2293                 if (break_out)
2294                         break;
2295
2296 #if ENABLE_FEATURE_TAB_COMPLETION
2297                 if (ic_raw != '\t')
2298                         lastWasTab = FALSE;
2299 #endif
2300         } /* while (1) */
2301
2302 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2303         if (S.sent_ESC_br6n) {
2304                 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2305                  * We sent "ESC [ 6 n", but got '\n' first, and
2306                  * KEYCODE_CURSOR_POS response is now buffered from terminal.
2307                  * It's bad already and not much can be done with it
2308                  * (it _will_ be visible for the next process to read stdin),
2309                  * but without this delay it even shows up on the screen
2310                  * as garbage because we restore echo settings with tcsetattr
2311                  * before it comes in. UGLY!
2312                  */
2313                 usleep(20*1000);
2314         }
2315 #endif
2316
2317 /* Stop bug catching using "command_must_not_be_used" trick */
2318 #undef command
2319
2320 #if ENABLE_UNICODE_SUPPORT
2321         command[0] = '\0';
2322         if (command_len > 0)
2323                 command_len = save_string(command, maxsize - 1);
2324         free(command_ps);
2325 #endif
2326
2327         if (command_len > 0)
2328                 remember_in_history(command);
2329
2330         if (break_out > 0) {
2331                 command[command_len++] = '\n';
2332                 command[command_len] = '\0';
2333         }
2334
2335 #if ENABLE_FEATURE_TAB_COMPLETION
2336         free_tab_completion_data();
2337 #endif
2338
2339         /* restore initial_settings */
2340         tcsetattr_stdin_TCSANOW(&initial_settings);
2341         /* restore SIGWINCH handler */
2342         signal(SIGWINCH, previous_SIGWINCH_handler);
2343         fflush_all();
2344
2345         len = command_len;
2346         DEINIT_S();
2347
2348         return len; /* can't return command_len, DEINIT_S() destroys it */
2349 }
2350
2351 #else
2352
2353 #undef read_line_input
2354 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2355 {
2356         fputs(prompt, stdout);
2357         fflush_all();
2358         fgets(command, maxsize, stdin);
2359         return strlen(command);
2360 }
2361
2362 #endif  /* FEATURE_EDITING */
2363
2364
2365 /*
2366  * Testing
2367  */
2368
2369 #ifdef TEST
2370
2371 #include <locale.h>
2372
2373 const char *applet_name = "debug stuff usage";
2374
2375 int main(int argc, char **argv)
2376 {
2377         char buff[MAX_LINELEN];
2378         char *prompt =
2379 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2380                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2381                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2382                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2383 #else
2384                 "% ";
2385 #endif
2386
2387 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
2388         setlocale(LC_ALL, "");
2389 #endif
2390         while (1) {
2391                 int l;
2392                 l = read_line_input(prompt, buff);
2393                 if (l <= 0 || buff[l-1] != '\n')
2394                         break;
2395                 buff[l-1] = 0;
2396                 printf("*** read_line_input() returned line =%s=\n", buff);
2397         }
2398         printf("*** read_line_input() detect ^D\n");
2399         return 0;
2400 }
2401
2402 #endif  /* TEST */