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, and more will probably
  20  * need to be added. 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  * lineedit does not know that the terminal escape sequences do not
  26  * take up space on the screen. The redisplay code assumes, unless
  27  * told otherwise, that each character in the prompt is a printable
  28  * character that takes up one character position on the screen.
  29  * You need to tell lineedit that some sequences of characters
  30  * in the prompt take up no screen space. Compatibly with readline,
  31  * use the \[ escape to begin a sequence of non-printing characters,
  32  * and the \] escape to signal the end of such a sequence. Example:
  33  *
  34  * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
  35  */
  36 #include "libbb.h"
  37 #include "unicode.h"
  38
  39 /* FIXME: obsolete CONFIG item? */
  40 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  41
  42 #ifdef TEST
  43 # define ENABLE_FEATURE_EDITING 0
  44 # define ENABLE_FEATURE_TAB_COMPLETION 0
  45 # define ENABLE_FEATURE_USERNAME_COMPLETION 0
  46 # define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  47 #endif
  48
  49
  50 /* Entire file (except TESTing part) sits inside this #if */
  51 #if ENABLE_FEATURE_EDITING
  52
  53
  54 #define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
  55         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  56 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
  57 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  58 #undef IF_FEATURE_GETUSERNAME_AND_HOMEDIR
  59 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
  60 #endif
  61
  62
  63 #undef CHAR_T
  64 #if ENABLE_FEATURE_ASSUME_UNICODE
  65 # define BB_NUL L'\0'
  66 # define CHAR_T wchar_t
  67 # define BB_isspace(c) iswspace(c)
  68 # define BB_isalnum(c) iswalnum(c)
  69 # define BB_ispunct(c) iswpunct(c)
  70 # define BB_isprint(c) iswprint(c)
  71 /* this catches bugs */
  72 # undef isspace
  73 # undef isalnum
  74 # undef ispunct
  75 # undef isprint
  76 # define isspace isspace_must_not_be_used
  77 # define isalnum isalnum_must_not_be_used
  78 # define ispunct ispunct_must_not_be_used
  79 # define isprint isprint_must_not_be_used
  80 #else
  81 # define BB_NUL '\0'
  82 # define CHAR_T char
  83 # define BB_isspace(c) isspace(c)
  84 # define BB_isalnum(c) isalnum(c)
  85 # define BB_ispunct(c) ispunct(c)
  86 # if ENABLE_LOCALE_SUPPORT
  87 #  define BB_isprint(c) isprint(c)
  88 # else
  89 #  define BB_isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233'))
  90 # endif
  91 #endif
  92
  93
  94 enum {
  95         /* We use int16_t for positions, need to limit line len */
  96         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
  97                       ? CONFIG_FEATURE_EDITING_MAX_LEN
  98                       : 0x7ff0
  99 };
 100
 101 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 102 static const char null_str[] ALIGN1 = "";
 103 #endif
 104
 105 /* We try to minimize both static and stack usage. */
 106 struct lineedit_statics {
 107         line_input_t *state;
 108
 109         volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
 110         sighandler_t previous_SIGWINCH_handler;
 111
 112         unsigned cmdedit_x;        /* real x (col) terminal position */
 113         unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
 114         unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
 115
 116         unsigned cursor;
 117         unsigned command_len;
 118         /* *int* maxsize: we want x in "if (x > S.maxsize)"
 119          * to _not_ be promoted to unsigned */
 120         int maxsize;
 121         CHAR_T *command_ps;
 122
 123         const char *cmdedit_prompt;
 124 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 125         int num_ok_lines; /* = 1; */
 126 #endif
 127
 128 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 129         char *user_buf;
 130         char *home_pwd_buf; /* = (char*)null_str; */
 131 #endif
 132
 133 #if ENABLE_FEATURE_TAB_COMPLETION
 134         char **matches;
 135         unsigned num_matches;
 136 #endif
 137
 138 #if ENABLE_FEATURE_EDITING_VI
 139 #define DELBUFSIZ 128
 140         CHAR_T *delptr;
 141         smallint newdelflag;     /* whether delbuf should be reused yet */
 142         CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 143 #endif
 144
 145         /* Formerly these were big buffers on stack: */
 146 #if ENABLE_FEATURE_TAB_COMPLETION
 147         char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
 148         char input_tab__matchBuf[MAX_LINELEN];
 149         int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
 150         int16_t find_match__pos_buf[MAX_LINELEN + 1];
 151 #endif
 152 };
 153
 154 /* See lineedit_ptr_hack.c */
 155 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 156
 157 #define S (*lineedit_ptr_to_statics)
 158 #define state            (S.state           )
 159 #define cmdedit_termw    (S.cmdedit_termw   )
 160 #define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
 161 #define cmdedit_x        (S.cmdedit_x       )
 162 #define cmdedit_y        (S.cmdedit_y       )
 163 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 164 #define cursor           (S.cursor          )
 165 #define command_len      (S.command_len     )
 166 #define command_ps       (S.command_ps      )
 167 #define cmdedit_prompt   (S.cmdedit_prompt  )
 168 #define num_ok_lines     (S.num_ok_lines    )
 169 #define user_buf         (S.user_buf        )
 170 #define home_pwd_buf     (S.home_pwd_buf    )
 171 #define matches          (S.matches         )
 172 #define num_matches      (S.num_matches     )
 173 #define delptr           (S.delptr          )
 174 #define newdelflag       (S.newdelflag      )
 175 #define delbuf           (S.delbuf          )
 176
 177 #define INIT_S() do { \
 178         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 179         barrier(); \
 180         cmdedit_termw = 80; \
 181         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
 182         IF_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 183 } while (0)
 184 static void deinit_S(void)
 185 {
 186 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 187         /* This one is allocated only if FANCY_PROMPT is on
 188          * (otherwise it points to verbatim prompt (NOT malloced) */
 189         free((char*)cmdedit_prompt);
 190 #endif
 191 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 192         free(user_buf);
 193         if (home_pwd_buf != null_str)
 194                 free(home_pwd_buf);
 195 #endif
 196         free(lineedit_ptr_to_statics);
 197 }
 198 #define DEINIT_S() deinit_S()
 199
 200
 201 #if ENABLE_FEATURE_ASSUME_UNICODE
 202 static size_t load_string(const char *src, int maxsize)
 203 {
 204         ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
 205         if (len < 0)
 206                 len = 0;
 207         command_ps[len] = L'\0';
 208         return len;
 209 }
 210 static size_t save_string(char *dst, int maxsize)
 211 {
 212         ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
 213         if (len < 0)
 214                 len = 0;
 215         dst[len] = '\0';
 216         return len;
 217 }
 218 /* I thought just fputwc(c, stdout) would work. But no... */
 219 static void BB_PUTCHAR(wchar_t c)
 220 {
 221         char buf[MB_CUR_MAX + 1];
 222         mbstate_t mbst = { 0 };
 223         ssize_t len = wcrtomb(buf, c, &mbst);
 224
 225         if (len > 0) {
 226                 buf[len] = '\0';
 227                 fputs(buf, stdout);
 228         }
 229 }
 230 #else
 231 static size_t load_string(const char *src, int maxsize)
 232 {
 233         safe_strncpy(command_ps, src, maxsize);
 234         return strlen(command_ps);
 235 }
 236 # if ENABLE_FEATURE_TAB_COMPLETION
 237 static void save_string(char *dst, int maxsize)
 238 {
 239         safe_strncpy(dst, command_ps, maxsize);
 240 }
 241 # endif
 242 # define BB_PUTCHAR(c) bb_putchar(c)
 243 #endif
 244
 245
 246 /* Put 'command_ps[cursor]', cursor++.
 247  * Advance cursor on screen. If we reached right margin, scroll text up
 248  * and remove terminal margin effect by printing 'next_char' */
 249 #define HACK_FOR_WRONG_WIDTH 1
 250 #if HACK_FOR_WRONG_WIDTH
 251 static void cmdedit_set_out_char(void)
 252 #define cmdedit_set_out_char(next_char) cmdedit_set_out_char()
 253 #else
 254 static void cmdedit_set_out_char(int next_char)
 255 #endif
 256 {
 257         CHAR_T c = command_ps[cursor];
 258
 259         if (c == BB_NUL) {
 260                 /* erase character after end of input string */
 261                 c = ' ';
 262         }
 263 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 264         /* Display non-printable characters in reverse */
 265         if (!BB_isprint(c)) {
 266                 if (c >= 128)
 267                         c -= 128;
 268                 if (c < ' ')
 269                         c += '@';
 270                 if (c == 127)
 271                         c = '?';
 272                 printf("\033[7m%c\033[0m", c);
 273         } else
 274 #endif
 275         {
 276                 BB_PUTCHAR(c);
 277         }
 278         if (++cmdedit_x >= cmdedit_termw) {
 279                 /* terminal is scrolled down */
 280                 cmdedit_y++;
 281                 cmdedit_x = 0;
 282 #if HACK_FOR_WRONG_WIDTH
 283                 /* This works better if our idea of term width is wrong
 284                  * and it is actually wider (often happens on serial lines).
 285                  * Printing CR,LF *forces* cursor to next line.
 286                  * OTOH if terminal width is correct AND terminal does NOT
 287                  * have automargin (IOW: it is moving cursor to next line
 288                  * by itself (which is wrong for VT-10x terminals)),
 289                  * this will break things: there will be one extra empty line */
 290                 puts("\r"); /* + implicit '\n' */
 291 #else
 292                 /* Works ok only if cmdedit_termw is correct */
 293                 /* destroy "(auto)margin" */
 294                 bb_putchar(next_char);
 295                 bb_putchar('\b');
 296 #endif
 297         }
 298 // Huh? What if command_ps[cursor] == BB_NUL (we are at the end already?)
 299         cursor++;
 300 }
 301
 302 /* Move to end of line (by printing all chars till the end) */
 303 static void input_end(void)
 304 {
 305         while (cursor < command_len)
 306                 cmdedit_set_out_char(' ');
 307 }
 308
 309 /* Go to the next line */
 310 static void goto_new_line(void)
 311 {
 312         input_end();
 313         if (cmdedit_x)
 314                 bb_putchar('\n');
 315 }
 316
 317
 318 static void out1str(const char *s)
 319 {
 320         if (s)
 321                 fputs(s, stdout);
 322 }
 323
 324 static void beep(void)
 325 {
 326         bb_putchar('\007');
 327 }
 328
 329 /* Move back one character */
 330 /* (optimized for slow terminals) */
 331 static void input_backward(unsigned num)
 332 {
 333         int count_y;
 334
 335         if (num > cursor)
 336                 num = cursor;
 337         if (!num)
 338                 return;
 339         cursor -= num;
 340
 341         if (cmdedit_x >= num) {
 342                 cmdedit_x -= num;
 343                 if (num <= 4) {
 344                         /* This is longer by 5 bytes on x86.
 345                          * Also gets miscompiled for ARM users
 346                          * (busybox.net/bugs/view.php?id=2274).
 347                          * printf(("\b\b\b\b" + 4) - num);
 348                          * return;
 349                          */
 350                         do {
 351                                 bb_putchar('\b');
 352                         } while (--num);
 353                         return;
 354                 }
 355                 printf("\033[%uD", num);
 356                 return;
 357         }
 358
 359         /* Need to go one or more lines up */
 360         num -= cmdedit_x;
 361         {
 362                 unsigned w = cmdedit_termw; /* volatile var */
 363                 count_y = 1 + (num / w);
 364                 cmdedit_y -= count_y;
 365                 cmdedit_x = w * count_y - num;
 366         }
 367         /* go to 1st column; go up; go to correct column */
 368         printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
 369 }
 370
 371 static void put_prompt(void)
 372 {
 373         out1str(cmdedit_prompt);
 374         if (ENABLE_FEATURE_EDITING_ASK_TERMINAL) {
 375                 /* Ask terminal where is the cursor now.
 376                  * lineedit_read_key handles response and corrects
 377                  * our idea of current cursor position.
 378                  * Testcase: run "echo -n long_line_long_line_long_line",
 379                  * then type in a long, wrapping command and try to
 380                  * delete it using backspace key.
 381                  * Note: we print it _after_ prompt, because
 382                  * prompt may contain CR. Example: PS1='\[\r\n\]\w '
 383                  */
 384                 out1str("\033" "[6n");
 385         }
 386         cursor = 0;
 387         {
 388                 unsigned w = cmdedit_termw; /* volatile var */
 389                 cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
 390                 cmdedit_x = cmdedit_prmt_len % w;
 391         }
 392 }
 393
 394 /* draw prompt, editor line, and clear tail */
 395 static void redraw(int y, int back_cursor)
 396 {
 397         if (y > 0)  /* up to start y */
 398                 printf("\033[%uA", y);
 399         bb_putchar('\r');
 400         put_prompt();
 401         input_end();      /* rewrite */
 402         printf("\033[J"); /* erase after cursor */
 403         input_backward(back_cursor);
 404 }
 405
 406 /* Delete the char in front of the cursor, optionally saving it
 407  * for later putback */
 408 #if !ENABLE_FEATURE_EDITING_VI
 409 static void input_delete(void)
 410 #define input_delete(save) input_delete()
 411 #else
 412 static void input_delete(int save)
 413 #endif
 414 {
 415         int j = cursor;
 416
 417         if (j == (int)command_len)
 418                 return;
 419
 420 #if ENABLE_FEATURE_EDITING_VI
 421         if (save) {
 422                 if (newdelflag) {
 423                         delptr = delbuf;
 424                         newdelflag = 0;
 425                 }
 426                 if ((delptr - delbuf) < DELBUFSIZ)
 427                         *delptr++ = command_ps[j];
 428         }
 429 #endif
 430
 431         memmove(command_ps + j, command_ps + j + 1,
 432                         (command_len - j + 1) * sizeof(command_ps[0]));
 433         command_len--;
 434         input_end();                    /* rewrite new line */
 435         cmdedit_set_out_char(' ');      /* erase char */
 436         input_backward(cursor - j);     /* back to old pos cursor */
 437 }
 438
 439 #if ENABLE_FEATURE_EDITING_VI
 440 static void put(void)
 441 {
 442         int ocursor;
 443         int j = delptr - delbuf;
 444
 445         if (j == 0)
 446                 return;
 447         ocursor = cursor;
 448         /* open hole and then fill it */
 449         memmove(command_ps + cursor + j, command_ps + cursor,
 450                         (command_len - cursor + 1) * sizeof(command_ps[0]));
 451         memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
 452         command_len += j;
 453         input_end();                    /* rewrite new line */
 454         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 455 }
 456 #endif
 457
 458 /* Delete the char in back of the cursor */
 459 static void input_backspace(void)
 460 {
 461         if (cursor > 0) {
 462                 input_backward(1);
 463                 input_delete(0);
 464         }
 465 }
 466
 467 /* Move forward one character */
 468 static void input_forward(void)
 469 {
 470         if (cursor < command_len)
 471                 cmdedit_set_out_char(command_ps[cursor + 1]);
 472 }
 473
 474 #if ENABLE_FEATURE_TAB_COMPLETION
 475
 476 static void free_tab_completion_data(void)
 477 {
 478         if (matches) {
 479                 while (num_matches)
 480                         free(matches[--num_matches]);
 481                 free(matches);
 482                 matches = NULL;
 483         }
 484 }
 485
 486 static void add_match(char *matched)
 487 {
 488         matches = xrealloc_vector(matches, 4, num_matches);
 489         matches[num_matches] = matched;
 490         num_matches++;
 491 }
 492
 493 #if ENABLE_FEATURE_USERNAME_COMPLETION
 494 static void username_tab_completion(char *ud, char *with_shash_flg)
 495 {
 496         struct passwd *entry;
 497         int userlen;
 498
 499         ud++;                           /* ~user/... to user/... */
 500         userlen = strlen(ud);
 501
 502         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 503                 char *sav_ud = ud - 1;
 504                 char *home = NULL;
 505
 506                 if (*ud == '/') {       /* "~/..."     */
 507                         home = home_pwd_buf;
 508                 } else {
 509                         /* "~user/..." */
 510                         char *temp;
 511                         temp = strchr(ud, '/');
 512                         *temp = '\0';           /* ~user\0 */
 513                         entry = getpwnam(ud);
 514                         *temp = '/';            /* restore ~user/... */
 515                         ud = temp;
 516                         if (entry)
 517                                 home = entry->pw_dir;
 518                 }
 519                 if (home) {
 520                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 521                                 /* /home/user/... */
 522                                 sprintf(sav_ud, "%s%s", home, ud);
 523                         }
 524                 }
 525         } else {
 526                 /* "~[^/]*" */
 527                 /* Using _r function to avoid pulling in static buffers */
 528                 char line_buff[256];
 529                 struct passwd pwd;
 530                 struct passwd *result;
 531
 532                 setpwent();
 533                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 534                         /* Null usernames should result in all users as possible completions. */
 535                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 536                                 add_match(xasprintf("~%s/", pwd.pw_name));
 537                         }
 538                 }
 539                 endpwent();
 540         }
 541 }
 542 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 543
 544 enum {
 545         FIND_EXE_ONLY = 0,
 546         FIND_DIR_ONLY = 1,
 547         FIND_FILE_ONLY = 2,
 548 };
 549
 550 static int path_parse(char ***p, int flags)
 551 {
 552         int npth;
 553         const char *pth;
 554         char *tmp;
 555         char **res;
 556
 557         /* if not setenv PATH variable, to search cur dir "." */
 558         if (flags != FIND_EXE_ONLY)
 559                 return 1;
 560
 561         if (state->flags & WITH_PATH_LOOKUP)
 562                 pth = state->path_lookup;
 563         else
 564                 pth = getenv("PATH");
 565         /* PATH=<empty> or PATH=:<empty> */
 566         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 567                 return 1;
 568
 569         tmp = (char*)pth;
 570         npth = 1; /* path component count */
 571         while (1) {
 572                 tmp = strchr(tmp, ':');
 573                 if (!tmp)
 574                         break;
 575                 if (*++tmp == '\0')
 576                         break;  /* :<empty> */
 577                 npth++;
 578         }
 579
 580         res = xmalloc(npth * sizeof(char*));
 581         res[0] = tmp = xstrdup(pth);
 582         npth = 1;
 583         while (1) {
 584                 tmp = strchr(tmp, ':');
 585                 if (!tmp)
 586                         break;
 587                 *tmp++ = '\0'; /* ':' -> '\0' */
 588                 if (*tmp == '\0')
 589                         break; /* :<empty> */
 590                 res[npth++] = tmp;
 591         }
 592         *p = res;
 593         return npth;
 594 }
 595
 596 static void exe_n_cwd_tab_completion(char *command, int type)
 597 {
 598         DIR *dir;
 599         struct dirent *next;
 600         struct stat st;
 601         char *path1[1];
 602         char **paths = path1;
 603         int npaths;
 604         int i;
 605         char *found;
 606         char *pfind = strrchr(command, '/');
 607 /*      char dirbuf[MAX_LINELEN]; */
 608 #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
 609
 610         npaths = 1;
 611         path1[0] = (char*)".";
 612
 613         if (pfind == NULL) {
 614                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 615                 npaths = path_parse(&paths, type);
 616                 pfind = command;
 617         } else {
 618                 /* dirbuf = ".../.../.../" */
 619                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 620 #if ENABLE_FEATURE_USERNAME_COMPLETION
 621                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 622                         username_tab_completion(dirbuf, dirbuf);
 623 #endif
 624                 paths[0] = dirbuf;
 625                 /* point to 'l' in "..../last_component" */
 626                 pfind++;
 627         }
 628
 629         for (i = 0; i < npaths; i++) {
 630                 dir = opendir(paths[i]);
 631                 if (!dir)
 632                         continue; /* don't print an error */
 633
 634                 while ((next = readdir(dir)) != NULL) {
 635                         int len1;
 636                         const char *str_found = next->d_name;
 637
 638                         /* matched? */
 639                         if (strncmp(str_found, pfind, strlen(pfind)))
 640                                 continue;
 641                         /* not see .name without .match */
 642                         if (*str_found == '.' && *pfind == '\0') {
 643                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 644                                         continue;
 645                                 str_found = ""; /* only "/" */
 646                         }
 647                         found = concat_path_file(paths[i], str_found);
 648                         /* hmm, remove in progress? */
 649                         /* NB: stat() first so that we see is it a directory;
 650                          * but if that fails, use lstat() so that
 651                          * we still match dangling links */
 652                         if (stat(found, &st) && lstat(found, &st))
 653                                 goto cont;
 654                         /* find with dirs? */
 655                         if (paths[i] != dirbuf)
 656                                 strcpy(found, next->d_name); /* only name */
 657
 658                         len1 = strlen(found);
 659                         found = xrealloc(found, len1 + 2);
 660                         found[len1] = '\0';
 661                         found[len1+1] = '\0';
 662
 663                         if (S_ISDIR(st.st_mode)) {
 664                                 /* name is a directory */
 665                                 if (found[len1-1] != '/') {
 666                                         found[len1] = '/';
 667                                 }
 668                         } else {
 669                                 /* not put found file if search only dirs for cd */
 670                                 if (type == FIND_DIR_ONLY)
 671                                         goto cont;
 672                         }
 673                         /* Add it to the list */
 674                         add_match(found);
 675                         continue;
 676  cont:
 677                         free(found);
 678                 }
 679                 closedir(dir);
 680         }
 681         if (paths != path1) {
 682                 free(paths[0]); /* allocated memory is only in first member */
 683                 free(paths);
 684         }
 685 #undef dirbuf
 686 }
 687
 688 //FIXME: HUH??? How about Unicode?
 689 #define QUOT (UCHAR_MAX+1)
 690
 691 #define collapse_pos(is, in) do { \
 692         memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
 693         memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
 694 } while (0)
 695
 696 static NOINLINE int find_match(char *matchBuf, int *len_with_quotes)
 697 {
 698         int i, j;
 699         int command_mode;
 700         int c, c2;
 701 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 702 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 703 #define int_buf (S.find_match__int_buf)
 704 #define pos_buf (S.find_match__pos_buf)
 705
 706         /* set to integer dimension characters and own positions */
 707         for (i = 0;; i++) {
 708                 int_buf[i] = (unsigned char)matchBuf[i];
 709                 if (int_buf[i] == 0) {
 710                         pos_buf[i] = -1;        /* indicator end line */
 711                         break;
 712                 }
 713                 pos_buf[i] = i;
 714         }
 715
 716         /* mask \+symbol and convert '\t' to ' ' */
 717         for (i = j = 0; matchBuf[i]; i++, j++)
 718                 if (matchBuf[i] == '\\') {
 719                         collapse_pos(j, j + 1);
 720                         int_buf[j] |= QUOT;
 721                         i++;
 722 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 723                         if (matchBuf[i] == '\t')        /* algorithm equivalent */
 724                                 int_buf[j] = ' ' | QUOT;
 725 #endif
 726                 }
 727 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 728                 else if (matchBuf[i] == '\t')
 729                         int_buf[j] = ' ';
 730 #endif
 731
 732         /* mask "symbols" or 'symbols' */
 733         c2 = 0;
 734         for (i = 0; int_buf[i]; i++) {
 735                 c = int_buf[i];
 736                 if (c == '\'' || c == '"') {
 737                         if (c2 == 0)
 738                                 c2 = c;
 739                         else {
 740                                 if (c == c2)
 741                                         c2 = 0;
 742                                 else
 743                                         int_buf[i] |= QUOT;
 744                         }
 745                 } else if (c2 != 0 && c != '$')
 746                         int_buf[i] |= QUOT;
 747         }
 748
 749         /* skip commands with arguments if line has commands delimiters */
 750         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 751         for (i = 0; int_buf[i]; i++) {
 752                 c = int_buf[i];
 753                 c2 = int_buf[i + 1];
 754                 j = i ? int_buf[i - 1] : -1;
 755                 command_mode = 0;
 756                 if (c == ';' || c == '&' || c == '|') {
 757                         command_mode = 1 + (c == c2);
 758                         if (c == '&') {
 759                                 if (j == '>' || j == '<')
 760                                         command_mode = 0;
 761                         } else if (c == '|' && j == '>')
 762                                 command_mode = 0;
 763                 }
 764                 if (command_mode) {
 765                         collapse_pos(0, i + command_mode);
 766                         i = -1;                         /* hack incremet */
 767                 }
 768         }
 769         /* collapse `command...` */
 770         for (i = 0; int_buf[i]; i++)
 771                 if (int_buf[i] == '`') {
 772                         for (j = i + 1; int_buf[j]; j++)
 773                                 if (int_buf[j] == '`') {
 774                                         collapse_pos(i, j + 1);
 775                                         j = 0;
 776                                         break;
 777                                 }
 778                         if (j) {
 779                                 /* not found close ` - command mode, collapse all previous */
 780                                 collapse_pos(0, i + 1);
 781                                 break;
 782                         } else
 783                                 i--;                    /* hack incremet */
 784                 }
 785
 786         /* collapse (command...(command...)...) or {command...{command...}...} */
 787         c = 0;                                          /* "recursive" level */
 788         c2 = 0;
 789         for (i = 0; int_buf[i]; i++)
 790                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 791                         if (int_buf[i] == '(')
 792                                 c++;
 793                         else
 794                                 c2++;
 795                         collapse_pos(0, i + 1);
 796                         i = -1;                         /* hack incremet */
 797                 }
 798         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++)
 799                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 800                         if (int_buf[i] == ')')
 801                                 c--;
 802                         else
 803                                 c2--;
 804                         collapse_pos(0, i + 1);
 805                         i = -1;                         /* hack incremet */
 806                 }
 807
 808         /* skip first not quote space */
 809         for (i = 0; int_buf[i]; i++)
 810                 if (int_buf[i] != ' ')
 811                         break;
 812         if (i)
 813                 collapse_pos(0, i);
 814
 815         /* set find mode for completion */
 816         command_mode = FIND_EXE_ONLY;
 817         for (i = 0; int_buf[i]; i++)
 818                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 819                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 820                          && matchBuf[pos_buf[0]] == 'c'
 821                          && matchBuf[pos_buf[1]] == 'd'
 822                         ) {
 823                                 command_mode = FIND_DIR_ONLY;
 824                         } else {
 825                                 command_mode = FIND_FILE_ONLY;
 826                                 break;
 827                         }
 828                 }
 829         for (i = 0; int_buf[i]; i++)
 830                 /* "strlen" */;
 831         /* find last word */
 832         for (--i; i >= 0; i--) {
 833                 c = int_buf[i];
 834                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 835                         collapse_pos(0, i + 1);
 836                         break;
 837                 }
 838         }
 839         /* skip first not quoted '\'' or '"' */
 840         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 841                 /*skip*/;
 842         /* collapse quote or unquote // or /~ */
 843         while ((int_buf[i] & ~QUOT) == '/'
 844          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 845         ) {
 846                 i++;
 847         }
 848
 849         /* set only match and destroy quotes */
 850         j = 0;
 851         for (c = 0; pos_buf[i] >= 0; i++) {
 852                 matchBuf[c++] = matchBuf[pos_buf[i]];
 853                 j = pos_buf[i] + 1;
 854         }
 855         matchBuf[c] = '\0';
 856         /* old length matchBuf with quotes symbols */
 857         *len_with_quotes = j ? j - pos_buf[0] : 0;
 858
 859         return command_mode;
 860 #undef int_buf
 861 #undef pos_buf
 862 }
 863
 864 /*
 865  * display by column (original idea from ls applet,
 866  * very optimized by me :)
 867  */
 868 static void showfiles(void)
 869 {
 870         int ncols, row;
 871         int column_width = 0;
 872         int nfiles = num_matches;
 873         int nrows = nfiles;
 874         int l;
 875
 876         /* find the longest file name-  use that as the column width */
 877         for (row = 0; row < nrows; row++) {
 878                 l = strlen(matches[row]);
 879                 if (column_width < l)
 880                         column_width = l;
 881         }
 882         column_width += 2;              /* min space for columns */
 883         ncols = cmdedit_termw / column_width;
 884
 885         if (ncols > 1) {
 886                 nrows /= ncols;
 887                 if (nfiles % ncols)
 888                         nrows++;        /* round up fractionals */
 889         } else {
 890                 ncols = 1;
 891         }
 892         for (row = 0; row < nrows; row++) {
 893                 int n = row;
 894                 int nc;
 895
 896                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
 897                         printf("%s%-*s", matches[n],
 898                                 (int)(column_width - strlen(matches[n])), "");
 899                 }
 900                 puts(matches[n]);
 901         }
 902 }
 903
 904 static char *add_quote_for_spec_chars(char *found)
 905 {
 906         int l = 0;
 907         char *s = xmalloc((strlen(found) + 1) * 2);
 908
 909         while (*found) {
 910                 if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found))
 911                         s[l++] = '\\';
 912                 s[l++] = *found++;
 913         }
 914         s[l] = 0;
 915         return s;
 916 }
 917
 918 /* Do TAB completion */
 919 static void input_tab(smallint *lastWasTab)
 920 {
 921         if (!(state->flags & TAB_COMPLETION))
 922                 return;
 923
 924         if (!*lastWasTab) {
 925                 char *tmp, *tmp1;
 926                 size_t len_found;
 927 /*              char matchBuf[MAX_LINELEN]; */
 928 #define matchBuf (S.input_tab__matchBuf)
 929                 int find_type;
 930                 int recalc_pos;
 931 #if ENABLE_FEATURE_ASSUME_UNICODE
 932                 /* cursor pos in command converted to multibyte form */
 933                 int cursor_mb;
 934 #endif
 935
 936                 *lastWasTab = TRUE;             /* flop trigger */
 937
 938                 /* Make a local copy of the string --
 939                  * up to the position of the cursor */
 940                 save_string(matchBuf, cursor + 1);
 941 #if ENABLE_FEATURE_ASSUME_UNICODE
 942                 cursor_mb = strlen(matchBuf);
 943 #endif
 944                 tmp = matchBuf;
 945
 946                 find_type = find_match(matchBuf, &recalc_pos);
 947
 948                 /* Free up any memory already allocated */
 949                 free_tab_completion_data();
 950
 951 #if ENABLE_FEATURE_USERNAME_COMPLETION
 952                 /* If the word starts with `~' and there is no slash in the word,
 953                  * then try completing this word as a username. */
 954                 if (state->flags & USERNAME_COMPLETION)
 955                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
 956                                 username_tab_completion(matchBuf, NULL);
 957 #endif
 958                 /* Try to match any executable in our path and everything
 959                  * in the current working directory */
 960                 if (!matches)
 961                         exe_n_cwd_tab_completion(matchBuf, find_type);
 962                 /* Sort, then remove any duplicates found */
 963                 if (matches) {
 964                         unsigned i;
 965                         int n = 0;
 966                         qsort_string_vector(matches, num_matches);
 967                         for (i = 0; i < num_matches - 1; ++i) {
 968                                 if (matches[i] && matches[i+1]) { /* paranoia */
 969                                         if (strcmp(matches[i], matches[i+1]) == 0) {
 970                                                 free(matches[i]);
 971                                                 matches[i] = NULL; /* paranoia */
 972                                         } else {
 973                                                 matches[n++] = matches[i];
 974                                         }
 975                                 }
 976                         }
 977                         matches[n] = matches[i];
 978                         num_matches = n + 1;
 979                 }
 980                 /* Did we find exactly one match? */
 981                 if (!matches || num_matches > 1) { /* no */
 982                         beep();
 983                         if (!matches)
 984                                 return;         /* not found */
 985                         /* find minimal match */
 986                         tmp1 = xstrdup(matches[0]);
 987                         for (tmp = tmp1; *tmp; tmp++) {
 988                                 for (len_found = 1; len_found < num_matches; len_found++) {
 989                                         if (matches[len_found][tmp - tmp1] != *tmp) {
 990                                                 *tmp = '\0';
 991                                                 break;
 992                                         }
 993                                 }
 994                         }
 995                         if (*tmp1 == '\0') {        /* have unique */
 996                                 free(tmp1);
 997                                 return;
 998                         }
 999                         tmp = add_quote_for_spec_chars(tmp1);
1000                         free(tmp1);
1001                 } else {                        /* one match */
1002                         tmp = add_quote_for_spec_chars(matches[0]);
1003                         /* for next completion current found */
1004                         *lastWasTab = FALSE;
1005
1006                         len_found = strlen(tmp);
1007                         if (tmp[len_found-1] != '/') {
1008                                 tmp[len_found] = ' ';
1009                                 tmp[len_found+1] = '\0';
1010                         }
1011                 }
1012
1013                 len_found = strlen(tmp);
1014 #if !ENABLE_FEATURE_ASSUME_UNICODE
1015                 /* have space to place the match? */
1016                 /* The result consists of three parts with these lengths: */
1017                 /* (cursor - recalc_pos) + len_found + (command_len - cursor) */
1018                 /* it simplifies into: */
1019                 if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
1020                         /* save tail */
1021                         strcpy(matchBuf, command_ps + cursor);
1022                         /* add match and tail */
1023                         sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
1024                         command_len = strlen(command_ps);
1025                         /* new pos */
1026                         recalc_pos = cursor - recalc_pos + len_found;
1027                         /* write out the matched command */
1028                         redraw(cmdedit_y, command_len - recalc_pos);
1029                 }
1030 #else
1031                 {
1032                         char command[MAX_LINELEN];
1033                         int len = save_string(command, sizeof(command));
1034                         /* have space to place the match? */
1035                         /* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
1036                         if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
1037                                 /* save tail */
1038                                 strcpy(matchBuf, command + cursor_mb);
1039                                 /* where do we want to have cursor after all? */
1040                                 strcpy(&command[cursor_mb - recalc_pos], tmp);
1041                                 len = load_string(command, S.maxsize);
1042                                 /* add match and tail */
1043                                 sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
1044                                 command_len = load_string(command, S.maxsize);
1045                                 /* write out the matched command */
1046                                 redraw(cmdedit_y, command_len - len);
1047                         }
1048                 }
1049 #endif
1050                 free(tmp);
1051 #undef matchBuf
1052         } else {
1053                 /* Ok -- the last char was a TAB.  Since they
1054                  * just hit TAB again, print a list of all the
1055                  * available choices... */
1056                 if (matches && num_matches > 0) {
1057                         /* changed by goto_new_line() */
1058                         int sav_cursor = cursor;
1059
1060                         /* Go to the next line */
1061                         goto_new_line();
1062                         showfiles();
1063                         redraw(0, command_len - sav_cursor);
1064                 }
1065         }
1066 }
1067
1068 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
1069
1070
1071 line_input_t* FAST_FUNC new_line_input_t(int flags)
1072 {
1073         line_input_t *n = xzalloc(sizeof(*n));
1074         n->flags = flags;
1075         return n;
1076 }
1077
1078
1079 #if MAX_HISTORY > 0
1080
1081 static void save_command_ps_at_cur_history(void)
1082 {
1083         if (command_ps[0] != BB_NUL) {
1084                 int cur = state->cur_history;
1085                 free(state->history[cur]);
1086
1087 #if ENABLE_FEATURE_ASSUME_UNICODE
1088                 {
1089                         char tbuf[MAX_LINELEN];
1090                         save_string(tbuf, sizeof(tbuf));
1091                         state->history[cur] = xstrdup(tbuf);
1092                 }
1093 #else
1094                 state->history[cur] = xstrdup(command_ps);
1095 #endif
1096         }
1097 }
1098
1099 /* state->flags is already checked to be nonzero */
1100 static int get_previous_history(void)
1101 {
1102         if ((state->flags & DO_HISTORY) && state->cur_history) {
1103                 save_command_ps_at_cur_history();
1104                 state->cur_history--;
1105                 return 1;
1106         }
1107         beep();
1108         return 0;
1109 }
1110
1111 static int get_next_history(void)
1112 {
1113         if (state->flags & DO_HISTORY) {
1114                 if (state->cur_history < state->cnt_history) {
1115                         save_command_ps_at_cur_history(); /* save the current history line */
1116                         return ++state->cur_history;
1117                 }
1118         }
1119         beep();
1120         return 0;
1121 }
1122
1123 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1124 /* We try to ensure that concurrent additions to the history
1125  * do not overwrite each other.
1126  * Otherwise shell users get unhappy.
1127  *
1128  * History file is trimmed lazily, when it grows several times longer
1129  * than configured MAX_HISTORY lines.
1130  */
1131
1132 static void free_line_input_t(line_input_t *n)
1133 {
1134         int i = n->cnt_history;
1135         while (i > 0)
1136                 free(n->history[--i]);
1137         free(n);
1138 }
1139
1140 /* state->flags is already checked to be nonzero */
1141 static void load_history(line_input_t *st_parm)
1142 {
1143         char *temp_h[MAX_HISTORY];
1144         char *line;
1145         FILE *fp;
1146         unsigned idx, i, line_len;
1147
1148         /* NB: do not trash old history if file can't be opened */
1149
1150         fp = fopen_for_read(st_parm->hist_file);
1151         if (fp) {
1152                 /* clean up old history */
1153                 for (idx = st_parm->cnt_history; idx > 0;) {
1154                         idx--;
1155                         free(st_parm->history[idx]);
1156                         st_parm->history[idx] = NULL;
1157                 }
1158
1159                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1160                 memset(temp_h, 0, sizeof(temp_h));
1161                 st_parm->cnt_history_in_file = idx = 0;
1162                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1163                         if (line[0] == '\0') {
1164                                 free(line);
1165                                 continue;
1166                         }
1167                         free(temp_h[idx]);
1168                         temp_h[idx] = line;
1169                         st_parm->cnt_history_in_file++;
1170                         idx++;
1171                         if (idx == MAX_HISTORY)
1172                                 idx = 0;
1173                 }
1174                 fclose(fp);
1175
1176                 /* find first non-NULL temp_h[], if any */
1177                 if (st_parm->cnt_history_in_file) {
1178                         while (temp_h[idx] == NULL) {
1179                                 idx++;
1180                                 if (idx == MAX_HISTORY)
1181                                         idx = 0;
1182                         }
1183                 }
1184
1185                 /* copy temp_h[] to st_parm->history[] */
1186                 for (i = 0; i < MAX_HISTORY;) {
1187                         line = temp_h[idx];
1188                         if (!line)
1189                                 break;
1190                         idx++;
1191                         if (idx == MAX_HISTORY)
1192                                 idx = 0;
1193                         line_len = strlen(line);
1194                         if (line_len >= MAX_LINELEN)
1195                                 line[MAX_LINELEN-1] = '\0';
1196                         st_parm->history[i++] = line;
1197                 }
1198                 st_parm->cnt_history = i;
1199         }
1200 }
1201
1202 /* state->flags is already checked to be nonzero */
1203 static void save_history(char *str)
1204 {
1205         int fd;
1206         int len, len2;
1207
1208         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0666);
1209         if (fd < 0)
1210                 return;
1211         xlseek(fd, 0, SEEK_END); /* paranoia */
1212         len = strlen(str);
1213         str[len] = '\n'; /* we (try to) do atomic write */
1214         len2 = full_write(fd, str, len + 1);
1215         str[len] = '\0';
1216         close(fd);
1217         if (len2 != len + 1)
1218                 return; /* "wtf?" */
1219
1220         /* did we write so much that history file needs trimming? */
1221         state->cnt_history_in_file++;
1222         if (state->cnt_history_in_file > MAX_HISTORY * 4) {
1223                 FILE *fp;
1224                 char *new_name;
1225                 line_input_t *st_temp;
1226                 int i;
1227
1228                 /* we may have concurrently written entries from others.
1229                  * load them */
1230                 st_temp = new_line_input_t(state->flags);
1231                 st_temp->hist_file = state->hist_file;
1232                 load_history(st_temp);
1233
1234                 /* write out temp file and replace hist_file atomically */
1235                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1236                 fp = fopen_for_write(new_name);
1237                 if (fp) {
1238                         for (i = 0; i < st_temp->cnt_history; i++)
1239                                 fprintf(fp, "%s\n", st_temp->history[i]);
1240                         fclose(fp);
1241                         if (rename(new_name, state->hist_file) == 0)
1242                                 state->cnt_history_in_file = st_temp->cnt_history;
1243                 }
1244                 free(new_name);
1245                 free_line_input_t(st_temp);
1246         }
1247 }
1248 #else
1249 #define load_history(a) ((void)0)
1250 #define save_history(a) ((void)0)
1251 #endif /* FEATURE_COMMAND_SAVEHISTORY */
1252
1253 static void remember_in_history(char *str)
1254 {
1255         int i;
1256
1257         if (!(state->flags & DO_HISTORY))
1258                 return;
1259         if (str[0] == '\0')
1260                 return;
1261         i = state->cnt_history;
1262         /* Don't save dupes */
1263         if (i && strcmp(state->history[i-1], str) == 0)
1264                 return;
1265
1266         free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1267         state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1268
1269         /* If history[] is full, remove the oldest command */
1270         /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1271         if (i >= MAX_HISTORY) {
1272                 free(state->history[0]);
1273                 for (i = 0; i < MAX_HISTORY-1; i++)
1274                         state->history[i] = state->history[i+1];
1275                 /* i == MAX_HISTORY-1 */
1276         }
1277         /* i <= MAX_HISTORY-1 */
1278         state->history[i++] = xstrdup(str);
1279         /* i <= MAX_HISTORY */
1280         state->cur_history = i;
1281         state->cnt_history = i;
1282 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1283         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1284                 save_history(str);
1285 #endif
1286         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1287 }
1288
1289 #else /* MAX_HISTORY == 0 */
1290 #define remember_in_history(a) ((void)0)
1291 #endif /* MAX_HISTORY */
1292
1293
1294 /*
1295  * This function is used to grab a character buffer
1296  * from the input file descriptor and allows you to
1297  * a string with full command editing (sort of like
1298  * a mini readline).
1299  *
1300  * The following standard commands are not implemented:
1301  * ESC-b -- Move back one word
1302  * ESC-f -- Move forward one word
1303  * ESC-d -- Delete back one word
1304  * ESC-h -- Delete forward one word
1305  * CTL-t -- Transpose two characters
1306  *
1307  * Minimalist vi-style command line editing available if configured.
1308  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1309  */
1310
1311 #if ENABLE_FEATURE_EDITING_VI
1312 static void
1313 vi_Word_motion(int eat)
1314 {
1315         CHAR_T *command = command_ps;
1316
1317         while (cursor < command_len && !BB_isspace(command[cursor]))
1318                 input_forward();
1319         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1320                 input_forward();
1321 }
1322
1323 static void
1324 vi_word_motion(int eat)
1325 {
1326         CHAR_T *command = command_ps;
1327
1328         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1329                 while (cursor < command_len
1330                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1331                 ) {
1332                         input_forward();
1333                 }
1334         } else if (BB_ispunct(command[cursor])) {
1335                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1336                         input_forward();
1337         }
1338
1339         if (cursor < command_len)
1340                 input_forward();
1341
1342         if (eat) {
1343                 while (cursor < command_len && BB_isspace(command[cursor]))
1344                         input_forward();
1345         }
1346 }
1347
1348 static void
1349 vi_End_motion(void)
1350 {
1351         CHAR_T *command = command_ps;
1352
1353         input_forward();
1354         while (cursor < command_len && BB_isspace(command[cursor]))
1355                 input_forward();
1356         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1357                 input_forward();
1358 }
1359
1360 static void
1361 vi_end_motion(void)
1362 {
1363         CHAR_T *command = command_ps;
1364
1365         if (cursor >= command_len-1)
1366                 return;
1367         input_forward();
1368         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1369                 input_forward();
1370         if (cursor >= command_len-1)
1371                 return;
1372         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1373                 while (cursor < command_len-1
1374                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1375                 ) {
1376                         input_forward();
1377                 }
1378         } else if (BB_ispunct(command[cursor])) {
1379                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1380                         input_forward();
1381         }
1382 }
1383
1384 static void
1385 vi_Back_motion(void)
1386 {
1387         CHAR_T *command = command_ps;
1388
1389         while (cursor > 0 && BB_isspace(command[cursor-1]))
1390                 input_backward(1);
1391         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1392                 input_backward(1);
1393 }
1394
1395 static void
1396 vi_back_motion(void)
1397 {
1398         CHAR_T *command = command_ps;
1399
1400         if (cursor <= 0)
1401                 return;
1402         input_backward(1);
1403         while (cursor > 0 && BB_isspace(command[cursor]))
1404                 input_backward(1);
1405         if (cursor <= 0)
1406                 return;
1407         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1408                 while (cursor > 0
1409                  && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1410                 ) {
1411                         input_backward(1);
1412                 }
1413         } else if (BB_ispunct(command[cursor])) {
1414                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1415                         input_backward(1);
1416         }
1417 }
1418 #endif
1419
1420
1421 /*
1422  * read_line_input and its helpers
1423  */
1424
1425 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1426 static void parse_and_put_prompt(const char *prmt_ptr)
1427 {
1428         cmdedit_prompt = prmt_ptr;
1429         cmdedit_prmt_len = strlen(prmt_ptr);
1430         put_prompt();
1431 }
1432 #else
1433 static void parse_and_put_prompt(const char *prmt_ptr)
1434 {
1435         int prmt_len = 0;
1436         size_t cur_prmt_len = 0;
1437         char flg_not_length = '[';
1438         char *prmt_mem_ptr = xzalloc(1);
1439         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1440         char cbuf[2];
1441         char c;
1442         char *pbuf;
1443
1444         cmdedit_prmt_len = 0;
1445
1446         if (!cwd_buf) {
1447                 cwd_buf = (char *)bb_msg_unknown;
1448         }
1449
1450         cbuf[1] = '\0'; /* never changes */
1451
1452         while (*prmt_ptr) {
1453                 char *free_me = NULL;
1454
1455                 pbuf = cbuf;
1456                 c = *prmt_ptr++;
1457                 if (c == '\\') {
1458                         const char *cp = prmt_ptr;
1459                         int l;
1460
1461                         c = bb_process_escape_sequence(&prmt_ptr);
1462                         if (prmt_ptr == cp) {
1463                                 if (*cp == '\0')
1464                                         break;
1465                                 c = *prmt_ptr++;
1466
1467                                 switch (c) {
1468 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1469                                 case 'u':
1470                                         pbuf = user_buf ? user_buf : (char*)"";
1471                                         break;
1472 #endif
1473                                 case 'h':
1474                                         pbuf = free_me = safe_gethostname();
1475                                         *strchrnul(pbuf, '.') = '\0';
1476                                         break;
1477                                 case '$':
1478                                         c = (geteuid() == 0 ? '#' : '$');
1479                                         break;
1480 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1481                                 case 'w':
1482                                         /* /home/user[/something] -> ~[/something] */
1483                                         pbuf = cwd_buf;
1484                                         l = strlen(home_pwd_buf);
1485                                         if (l != 0
1486                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1487                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1488                                          && strlen(cwd_buf + l) < PATH_MAX
1489                                         ) {
1490                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1491                                         }
1492                                         break;
1493 #endif
1494                                 case 'W':
1495                                         pbuf = cwd_buf;
1496                                         cp = strrchr(pbuf, '/');
1497                                         if (cp != NULL && cp != pbuf)
1498                                                 pbuf += (cp-pbuf) + 1;
1499                                         break;
1500                                 case '!':
1501                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1502                                         break;
1503                                 case 'e': case 'E':     /* \e \E = \033 */
1504                                         c = '\033';
1505                                         break;
1506                                 case 'x': case 'X': {
1507                                         char buf2[4];
1508                                         for (l = 0; l < 3;) {
1509                                                 unsigned h;
1510                                                 buf2[l++] = *prmt_ptr;
1511                                                 buf2[l] = '\0';
1512                                                 h = strtoul(buf2, &pbuf, 16);
1513                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1514                                                         buf2[--l] = '\0';
1515                                                         break;
1516                                                 }
1517                                                 prmt_ptr++;
1518                                         }
1519                                         c = (char)strtoul(buf2, NULL, 16);
1520                                         if (c == 0)
1521                                                 c = '?';
1522                                         pbuf = cbuf;
1523                                         break;
1524                                 }
1525                                 case '[': case ']':
1526                                         if (c == flg_not_length) {
1527                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1528                                                 continue;
1529                                         }
1530                                         break;
1531                                 } /* switch */
1532                         } /* if */
1533                 } /* if */
1534                 cbuf[0] = c;
1535                 cur_prmt_len = strlen(pbuf);
1536                 prmt_len += cur_prmt_len;
1537                 if (flg_not_length != ']')
1538                         cmdedit_prmt_len += cur_prmt_len;
1539                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1540                 free(free_me);
1541         } /* while */
1542
1543         if (cwd_buf != (char *)bb_msg_unknown)
1544                 free(cwd_buf);
1545         cmdedit_prompt = prmt_mem_ptr;
1546         put_prompt();
1547 }
1548 #endif
1549
1550 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1551 {
1552         cmdedit_termw = w;
1553         if (redraw_flg) {
1554                 /* new y for current cursor */
1555                 int new_y = (cursor + cmdedit_prmt_len) / w;
1556                 /* redraw */
1557                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1558                 fflush(stdout);
1559         }
1560 }
1561
1562 static void win_changed(int nsig)
1563 {
1564         unsigned width;
1565         get_terminal_width_height(0, &width, NULL);
1566         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1567         if (nsig == SIGWINCH)
1568                 signal(SIGWINCH, win_changed); /* rearm ourself */
1569 }
1570
1571 static int lineedit_read_key(char *read_key_buffer)
1572 {
1573         int64_t ic;
1574         struct pollfd pfd;
1575         int delay = -1;
1576 #if ENABLE_FEATURE_ASSUME_UNICODE
1577         char unicode_buf[MB_CUR_MAX + 1];
1578         int unicode_idx = 0;
1579 #endif
1580
1581         pfd.fd = STDIN_FILENO;
1582         pfd.events = POLLIN;
1583         do {
1584  poll_again:
1585                 if (read_key_buffer[0] == 0) {
1586                         /* Wait for input. Can't just call read_key,
1587                          * it returns at once if stdin
1588                          * is in non-blocking mode. */
1589                         safe_poll(&pfd, 1, delay);
1590                 }
1591                 /* Note: read_key sets errno to 0 on success: */
1592                 ic = read_key(STDIN_FILENO, read_key_buffer);
1593                 if (ENABLE_FEATURE_EDITING_ASK_TERMINAL
1594                  && (int32_t)ic == KEYCODE_CURSOR_POS
1595                 ) {
1596                         int col = ((ic >> 32) & 0x7fff) - 1;
1597                         if (col > cmdedit_prmt_len) {
1598                                 cmdedit_x += (col - cmdedit_prmt_len);
1599                                 while (cmdedit_x >= cmdedit_termw) {
1600                                         cmdedit_x -= cmdedit_termw;
1601                                         cmdedit_y++;
1602                                 }
1603                         }
1604                         goto poll_again;
1605                 }
1606
1607 #if ENABLE_FEATURE_ASSUME_UNICODE
1608                 {
1609                         wchar_t wc;
1610
1611                         if ((int32_t)ic < 0) /* KEYCODE_xxx */
1612                                 return ic;
1613                         unicode_buf[unicode_idx++] = ic;
1614                         unicode_buf[unicode_idx] = '\0';
1615                         if (mbstowcs(&wc, unicode_buf, 1) != 1 && unicode_idx < MB_CUR_MAX) {
1616                                 delay = 50;
1617                                 goto poll_again;
1618                         }
1619                         ic = wc;
1620                 }
1621 #endif
1622         } while (errno == EAGAIN);
1623
1624         return ic;
1625 }
1626
1627 /* leave out the "vi-mode"-only case labels if vi editing isn't
1628  * configured. */
1629 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
1630
1631 /* convert uppercase ascii to equivalent control char, for readability */
1632 #undef CTRL
1633 #define CTRL(a) ((a) & ~0x40)
1634
1635 /* Returns:
1636  * -1 on read errors or EOF, or on bare Ctrl-D,
1637  * 0  on ctrl-C (the line entered is still returned in 'command'),
1638  * >0 length of input string, including terminating '\n'
1639  */
1640 int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1641 {
1642         int len;
1643 #if ENABLE_FEATURE_TAB_COMPLETION
1644         smallint lastWasTab = FALSE;
1645 #endif
1646         smallint break_out = 0;
1647 #if ENABLE_FEATURE_EDITING_VI
1648         smallint vi_cmdmode = 0;
1649 #endif
1650         struct termios initial_settings;
1651         struct termios new_settings;
1652         char read_key_buffer[KEYCODE_BUFFER_SIZE];
1653
1654         INIT_S();
1655
1656         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1657          || !(initial_settings.c_lflag & ECHO)
1658         ) {
1659                 /* Happens when e.g. stty -echo was run before */
1660                 parse_and_put_prompt(prompt);
1661                 fflush(stdout);
1662                 if (fgets(command, maxsize, stdin) == NULL)
1663                         len = -1; /* EOF or error */
1664                 else
1665                         len = strlen(command);
1666                 DEINIT_S();
1667                 return len;
1668         }
1669
1670         check_unicode_in_env();
1671
1672 // FIXME: audit & improve this
1673         if (maxsize > MAX_LINELEN)
1674                 maxsize = MAX_LINELEN;
1675         S.maxsize = maxsize;
1676
1677         /* With null flags, no other fields are ever used */
1678         state = st ? st : (line_input_t*) &const_int_0;
1679 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1680         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1681                 if (state->cnt_history == 0)
1682                         load_history(state);
1683 #endif
1684         if (state->flags & DO_HISTORY)
1685                 state->cur_history = state->cnt_history;
1686
1687         /* prepare before init handlers */
1688         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1689         command_len = 0;
1690 #if ENABLE_FEATURE_ASSUME_UNICODE
1691         command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
1692 #else
1693         command_ps = command;
1694         command[0] = '\0';
1695 #endif
1696 #define command command_must_not_be_used
1697
1698         new_settings = initial_settings;
1699         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1700         /* Turn off echoing and CTRL-C, so we can trap it */
1701         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1702         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1703         new_settings.c_cc[VMIN] = 1;
1704         new_settings.c_cc[VTIME] = 0;
1705         /* Turn off CTRL-C, so we can trap it */
1706 #ifndef _POSIX_VDISABLE
1707 #define _POSIX_VDISABLE '\0'
1708 #endif
1709         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1710         tcsetattr_stdin_TCSANOW(&new_settings);
1711
1712         /* Now initialize things */
1713         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1714         win_changed(0); /* do initial resizing */
1715 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1716         {
1717                 struct passwd *entry;
1718
1719                 entry = getpwuid(geteuid());
1720                 if (entry) {
1721                         user_buf = xstrdup(entry->pw_name);
1722                         home_pwd_buf = xstrdup(entry->pw_dir);
1723                 }
1724         }
1725 #endif
1726
1727 #if 0
1728         for (i = 0; i <= MAX_HISTORY; i++)
1729                 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
1730         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
1731 #endif
1732
1733         /* Print out the command prompt */
1734         parse_and_put_prompt(prompt);
1735
1736         read_key_buffer[0] = 0;
1737         while (1) {
1738                 /*
1739                  * The emacs and vi modes share much of the code in the big
1740                  * command loop.  Commands entered when in vi's command mode
1741                  * (aka "escape mode") get an extra bit added to distinguish
1742                  * them - this keeps them from being self-inserted. This
1743                  * clutters the big switch a bit, but keeps all the code
1744                  * in one place.
1745                  */
1746                 enum {
1747                         VI_CMDMODE_BIT = 0x40000000,
1748                         /* 0x80000000 bit flags KEYCODE_xxx */
1749                 };
1750                 int32_t ic;
1751
1752                 fflush(NULL);
1753                 ic = lineedit_read_key(read_key_buffer);
1754
1755 #if ENABLE_FEATURE_EDITING_VI
1756                 newdelflag = 1;
1757                 if (vi_cmdmode) {
1758                         /* btw, since KEYCODE_xxx are all < 0, this doesn't
1759                          * change ic if it contains one of them: */
1760                         ic |= VI_CMDMODE_BIT;
1761                 }
1762 #endif
1763
1764                 switch (ic) {
1765                 case '\n':
1766                 case '\r':
1767                 vi_case('\n'|VI_CMDMODE_BIT:)
1768                 vi_case('\r'|VI_CMDMODE_BIT:)
1769                         /* Enter */
1770                         goto_new_line();
1771                         break_out = 1;
1772                         break;
1773                 case CTRL('A'):
1774                 vi_case('0'|VI_CMDMODE_BIT:)
1775                         /* Control-a -- Beginning of line */
1776                         input_backward(cursor);
1777                         break;
1778                 case CTRL('B'):
1779                 vi_case('h'|VI_CMDMODE_BIT:)
1780                 vi_case('\b'|VI_CMDMODE_BIT:)
1781                 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
1782                         /* Control-b -- Move back one character */
1783                         input_backward(1);
1784                         break;
1785                 case CTRL('C'):
1786                 vi_case(CTRL('C')|VI_CMDMODE_BIT:)
1787                         /* Control-c -- stop gathering input */
1788                         goto_new_line();
1789                         command_len = 0;
1790                         break_out = -1; /* "do not append '\n'" */
1791                         break;
1792                 case CTRL('D'):
1793                         /* Control-d -- Delete one character, or exit
1794                          * if the len=0 and no chars to delete */
1795                         if (command_len == 0) {
1796                                 errno = 0;
1797 #if ENABLE_FEATURE_EDITING_VI
1798  prepare_to_die:
1799 #endif
1800                                 /* to control stopped jobs */
1801                                 break_out = command_len = -1;
1802                                 break;
1803                         }
1804                         input_delete(0);
1805                         break;
1806                 case CTRL('E'):
1807                 vi_case('$'|VI_CMDMODE_BIT:)
1808                         /* Control-e -- End of line */
1809                         input_end();
1810                         break;
1811                 case CTRL('F'):
1812                 vi_case('l'|VI_CMDMODE_BIT:)
1813                 vi_case(' '|VI_CMDMODE_BIT:)
1814                         /* Control-f -- Move forward one character */
1815                         input_forward();
1816                         break;
1817                 case '\b':
1818                 case '\x7f': /* DEL */
1819                         /* Control-h and DEL */
1820                         input_backspace();
1821                         break;
1822 #if ENABLE_FEATURE_TAB_COMPLETION
1823                 case '\t':
1824                         input_tab(&lastWasTab);
1825                         break;
1826 #endif
1827                 case CTRL('K'):
1828                         /* Control-k -- clear to end of line */
1829                         command_ps[cursor] = BB_NUL;
1830                         command_len = cursor;
1831                         printf("\033[J");
1832                         break;
1833                 case CTRL('L'):
1834                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
1835                         /* Control-l -- clear screen */
1836                         printf("\033[H");
1837                         redraw(0, command_len - cursor);
1838                         break;
1839 #if MAX_HISTORY > 0
1840                 case CTRL('N'):
1841                 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
1842                 vi_case('j'|VI_CMDMODE_BIT:)
1843                         /* Control-n -- Get next command in history */
1844                         if (get_next_history())
1845                                 goto rewrite_line;
1846                         break;
1847                 case CTRL('P'):
1848                 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
1849                 vi_case('k'|VI_CMDMODE_BIT:)
1850                         /* Control-p -- Get previous command from history */
1851                         if (get_previous_history())
1852                                 goto rewrite_line;
1853                         break;
1854 #endif
1855                 case CTRL('U'):
1856                 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
1857                         /* Control-U -- Clear line before cursor */
1858                         if (cursor) {
1859                                 command_len -= cursor;
1860                                 memmove(command_ps, command_ps + cursor,
1861                                         (command_len + 1) * sizeof(command_ps[0]));
1862                                 redraw(cmdedit_y, command_len);
1863                         }
1864                         break;
1865                 case CTRL('W'):
1866                 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
1867                         /* Control-W -- Remove the last word */
1868                         while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
1869                                 input_backspace();
1870                         while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
1871                                 input_backspace();
1872                         break;
1873
1874 #if ENABLE_FEATURE_EDITING_VI
1875                 case 'i'|VI_CMDMODE_BIT:
1876                         vi_cmdmode = 0;
1877                         break;
1878                 case 'I'|VI_CMDMODE_BIT:
1879                         input_backward(cursor);
1880                         vi_cmdmode = 0;
1881                         break;
1882                 case 'a'|VI_CMDMODE_BIT:
1883                         input_forward();
1884                         vi_cmdmode = 0;
1885                         break;
1886                 case 'A'|VI_CMDMODE_BIT:
1887                         input_end();
1888                         vi_cmdmode = 0;
1889                         break;
1890                 case 'x'|VI_CMDMODE_BIT:
1891                         input_delete(1);
1892                         break;
1893                 case 'X'|VI_CMDMODE_BIT:
1894                         if (cursor > 0) {
1895                                 input_backward(1);
1896                                 input_delete(1);
1897                         }
1898                         break;
1899                 case 'W'|VI_CMDMODE_BIT:
1900                         vi_Word_motion(1);
1901                         break;
1902                 case 'w'|VI_CMDMODE_BIT:
1903                         vi_word_motion(1);
1904                         break;
1905                 case 'E'|VI_CMDMODE_BIT:
1906                         vi_End_motion();
1907                         break;
1908                 case 'e'|VI_CMDMODE_BIT:
1909                         vi_end_motion();
1910                         break;
1911                 case 'B'|VI_CMDMODE_BIT:
1912                         vi_Back_motion();
1913                         break;
1914                 case 'b'|VI_CMDMODE_BIT:
1915                         vi_back_motion();
1916                         break;
1917                 case 'C'|VI_CMDMODE_BIT:
1918                         vi_cmdmode = 0;
1919                         /* fall through */
1920                 case 'D'|VI_CMDMODE_BIT:
1921                         goto clear_to_eol;
1922
1923                 case 'c'|VI_CMDMODE_BIT:
1924                         vi_cmdmode = 0;
1925                         /* fall through */
1926                 case 'd'|VI_CMDMODE_BIT: {
1927                         int nc, sc;
1928                         int prev_ic;
1929
1930                         sc = cursor;
1931                         prev_ic = ic;
1932
1933                         ic = lineedit_read_key(read_key_buffer);
1934                         if (errno) /* error */
1935                                 goto prepare_to_die;
1936
1937                         if ((ic | VI_CMDMODE_BIT) == prev_ic) {
1938                                 /* "cc", "dd" */
1939                                 input_backward(cursor);
1940                                 goto clear_to_eol;
1941                                 break;
1942                         }
1943                         switch (ic) {
1944                         case 'w':
1945                         case 'W':
1946                         case 'e':
1947                         case 'E':
1948                                 switch (ic) {
1949                                 case 'w':   /* "dw", "cw" */
1950                                         vi_word_motion(vi_cmdmode);
1951                                         break;
1952                                 case 'W':   /* 'dW', 'cW' */
1953                                         vi_Word_motion(vi_cmdmode);
1954                                         break;
1955                                 case 'e':   /* 'de', 'ce' */
1956                                         vi_end_motion();
1957                                         input_forward();
1958                                         break;
1959                                 case 'E':   /* 'dE', 'cE' */
1960                                         vi_End_motion();
1961                                         input_forward();
1962                                         break;
1963                                 }
1964                                 nc = cursor;
1965                                 input_backward(cursor - sc);
1966                                 while (nc-- > cursor)
1967                                         input_delete(1);
1968                                 break;
1969                         case 'b':  /* "db", "cb" */
1970                         case 'B':  /* implemented as B */
1971                                 if (ic == 'b')
1972                                         vi_back_motion();
1973                                 else
1974                                         vi_Back_motion();
1975                                 while (sc-- > cursor)
1976                                         input_delete(1);
1977                                 break;
1978                         case ' ':  /* "d ", "c " */
1979                                 input_delete(1);
1980                                 break;
1981                         case '$':  /* "d$", "c$" */
1982  clear_to_eol:
1983                                 while (cursor < command_len)
1984                                         input_delete(1);
1985                                 break;
1986                         }
1987                         break;
1988                 }
1989                 case 'p'|VI_CMDMODE_BIT:
1990                         input_forward();
1991                         /* fallthrough */
1992                 case 'P'|VI_CMDMODE_BIT:
1993                         put();
1994                         break;
1995                 case 'r'|VI_CMDMODE_BIT:
1996                         ic = lineedit_read_key(read_key_buffer);
1997                         if (errno) /* error */
1998                                 goto prepare_to_die;
1999                         if (ic < ' ' || ic > 255) {
2000                                 beep();
2001                         } else {
2002                                 command_ps[cursor] = ic;
2003                                 bb_putchar(ic);
2004                                 bb_putchar('\b');
2005                         }
2006                         break;
2007                 case '\x1b': /* ESC */
2008                         if (state->flags & VI_MODE) {
2009                                 /* insert mode --> command mode */
2010                                 vi_cmdmode = 1;
2011                                 input_backward(1);
2012                         }
2013                         break;
2014 #endif /* FEATURE_COMMAND_EDITING_VI */
2015
2016 #if MAX_HISTORY > 0
2017                 case KEYCODE_UP:
2018                         if (get_previous_history())
2019                                 goto rewrite_line;
2020                         beep();
2021                         break;
2022                 case KEYCODE_DOWN:
2023                         if (!get_next_history())
2024                                 break;
2025  rewrite_line:
2026                         /* Rewrite the line with the selected history item */
2027                         /* change command */
2028                         command_len = load_string(state->history[state->cur_history] ? : "", maxsize);
2029                         /* redraw and go to eol (bol, in vi) */
2030                         redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2031                         break;
2032 #endif
2033                 case KEYCODE_RIGHT:
2034                         input_forward();
2035                         break;
2036                 case KEYCODE_LEFT:
2037                         input_backward(1);
2038                         break;
2039                 case KEYCODE_DELETE:
2040                         input_delete(0);
2041                         break;
2042                 case KEYCODE_HOME:
2043                         input_backward(cursor);
2044                         break;
2045                 case KEYCODE_END:
2046                         input_end();
2047                         break;
2048
2049                 default:
2050 //                      /* Control-V -- force insert of next char */
2051 //                      if (c == CTRL('V')) {
2052 //                              if (safe_read(STDIN_FILENO, &c, 1) < 1)
2053 //                                      goto prepare_to_die;
2054 //                              if (c == 0) {
2055 //                                      beep();
2056 //                                      break;
2057 //                              }
2058 //                      }
2059                         if (ic < ' '
2060                          || (!ENABLE_FEATURE_ASSUME_UNICODE && ic >= 256)
2061                          || (ENABLE_FEATURE_ASSUME_UNICODE && ic >= VI_CMDMODE_BIT)
2062                         ) {
2063                                 /* If VI_CMDMODE_BIT is set, ic is >= 256
2064                                  * and command mode ignores unexpected chars.
2065                                  * Otherwise, we are here if ic is a
2066                                  * control char or an unhandled ESC sequence,
2067                                  * which is also ignored.
2068                                  */
2069                                 break;
2070                         }
2071                         if ((int)command_len >= (maxsize - 2)) {
2072                                 /* Not enough space for the char and EOL */
2073                                 break;
2074                         }
2075
2076                         command_len++;
2077                         if (cursor == (command_len - 1)) {
2078                                 /* We are at the end, append */
2079                                 command_ps[cursor] = ic;
2080                                 command_ps[cursor + 1] = BB_NUL;
2081                                 cmdedit_set_out_char(' ');
2082                         } else {
2083                                 /* In the middle, insert */
2084                                 int sc = cursor;
2085
2086                                 memmove(command_ps + sc + 1, command_ps + sc,
2087                                         (command_len - sc) * sizeof(command_ps[0]));
2088                                 command_ps[sc] = ic;
2089                                 sc++;
2090                                 /* rewrite from cursor */
2091                                 input_end();
2092                                 /* to prev x pos + 1 */
2093                                 input_backward(cursor - sc);
2094                         }
2095                         break;
2096                 } /* switch (input_key) */
2097
2098                 if (break_out)
2099                         break;
2100
2101 #if ENABLE_FEATURE_TAB_COMPLETION
2102                 ic &= ~VI_CMDMODE_BIT;
2103                 if (ic != '\t')
2104                         lastWasTab = FALSE;
2105 #endif
2106         } /* while (1) */
2107
2108 /* Stop bug catching using "command_must_not_be_used" trick */
2109 #undef command
2110
2111 #if ENABLE_FEATURE_ASSUME_UNICODE
2112         command_len = save_string(command, maxsize - 1);
2113         free(command_ps);
2114 #endif
2115
2116         if (command_len > 0)
2117                 remember_in_history(command);
2118
2119         if (break_out > 0) {
2120                 command[command_len++] = '\n';
2121                 command[command_len] = '\0';
2122         }
2123
2124 #if ENABLE_FEATURE_TAB_COMPLETION
2125         free_tab_completion_data();
2126 #endif
2127
2128         /* restore initial_settings */
2129         tcsetattr_stdin_TCSANOW(&initial_settings);
2130         /* restore SIGWINCH handler */
2131         signal(SIGWINCH, previous_SIGWINCH_handler);
2132         fflush(stdout);
2133
2134         len = command_len;
2135         DEINIT_S();
2136
2137         return len; /* can't return command_len, DEINIT_S() destroys it */
2138 }
2139
2140 #else
2141
2142 #undef read_line_input
2143 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2144 {
2145         fputs(prompt, stdout);
2146         fflush(stdout);
2147         fgets(command, maxsize, stdin);
2148         return strlen(command);
2149 }
2150
2151 #endif  /* FEATURE_EDITING */
2152
2153
2154 /*
2155  * Testing
2156  */
2157
2158 #ifdef TEST
2159
2160 #include <locale.h>
2161
2162 const char *applet_name = "debug stuff usage";
2163
2164 int main(int argc, char **argv)
2165 {
2166         char buff[MAX_LINELEN];
2167         char *prompt =
2168 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2169                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2170                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2171                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2172 #else
2173                 "% ";
2174 #endif
2175
2176 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
2177         setlocale(LC_ALL, "");
2178 #endif
2179         while (1) {
2180                 int l;
2181                 l = read_line_input(prompt, buff);
2182                 if (l <= 0 || buff[l-1] != '\n')
2183                         break;
2184                 buff[l-1] = 0;
2185                 printf("*** read_line_input() returned line =%s=\n", buff);
2186         }
2187         printf("*** read_line_input() detect ^D\n");
2188         return 0;
2189 }
2190
2191 #endif  /* TEST */