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 /* QUOT is used on elements of int_buf[], which are bytes,
 689  * not Unicode chars. Therefore it works correctly even in Unicode mode.
 690  */
 691 #define QUOT (UCHAR_MAX+1)
 692
 693 #define int_buf (S.find_match__int_buf)
 694 #define pos_buf (S.find_match__pos_buf)
 695 /* is must be <= in */
 696 static void collapse_pos(int is, int in)
 697 {
 698         memmove(int_buf+is, int_buf+in, (MAX_LINELEN+1-in)*sizeof(int_buf[0]));
 699         memmove(pos_buf+is, pos_buf+in, (MAX_LINELEN+1-in)*sizeof(pos_buf[0]));
 700 }
 701 static NOINLINE int find_match(char *matchBuf, int *len_with_quotes)
 702 {
 703         int i, j;
 704         int command_mode;
 705         int c, c2;
 706 /*      Were local, but it uses too much stack */
 707 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 708 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 709
 710         /* set to integer dimension characters and own positions */
 711         for (i = 0;; i++) {
 712                 int_buf[i] = (unsigned char)matchBuf[i];
 713                 if (int_buf[i] == 0) {
 714                         pos_buf[i] = -1; /* end-fo-line indicator */
 715                         break;
 716                 }
 717                 pos_buf[i] = i;
 718         }
 719
 720         /* mask \+symbol and convert '\t' to ' ' */
 721         for (i = j = 0; matchBuf[i]; i++, j++)
 722                 if (matchBuf[i] == '\\') {
 723                         collapse_pos(j, j + 1);
 724                         int_buf[j] |= QUOT;
 725                         i++;
 726 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 727                         if (matchBuf[i] == '\t')  /* algorithm equivalent */
 728                                 int_buf[j] = ' ' | QUOT;
 729 #endif
 730                 }
 731 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 732                 else if (matchBuf[i] == '\t')
 733                         int_buf[j] = ' ';
 734 #endif
 735
 736         /* mask "symbols" or 'symbols' */
 737         c2 = 0;
 738         for (i = 0; int_buf[i]; i++) {
 739                 c = int_buf[i];
 740                 if (c == '\'' || c == '"') {
 741                         if (c2 == 0)
 742                                 c2 = c;
 743                         else {
 744                                 if (c == c2)
 745                                         c2 = 0;
 746                                 else
 747                                         int_buf[i] |= QUOT;
 748                         }
 749                 } else if (c2 != 0 && c != '$')
 750                         int_buf[i] |= QUOT;
 751         }
 752
 753         /* skip commands with arguments if line has commands delimiters */
 754         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 755         for (i = 0; int_buf[i]; i++) {
 756                 c = int_buf[i];
 757                 c2 = int_buf[i + 1];
 758                 j = i ? int_buf[i - 1] : -1;
 759                 command_mode = 0;
 760                 if (c == ';' || c == '&' || c == '|') {
 761                         command_mode = 1 + (c == c2);
 762                         if (c == '&') {
 763                                 if (j == '>' || j == '<')
 764                                         command_mode = 0;
 765                         } else if (c == '|' && j == '>')
 766                                 command_mode = 0;
 767                 }
 768                 if (command_mode) {
 769                         collapse_pos(0, i + command_mode);
 770                         i = -1;  /* hack incremet */
 771                 }
 772         }
 773         /* collapse `command...` */
 774         for (i = 0; int_buf[i]; i++) {
 775                 if (int_buf[i] == '`') {
 776                         for (j = i + 1; int_buf[j]; j++)
 777                                 if (int_buf[j] == '`') {
 778                                         collapse_pos(i, j + 1);
 779                                         j = 0;
 780                                         break;
 781                                 }
 782                         if (j) {
 783                                 /* not found closing ` - command mode, collapse all previous */
 784                                 collapse_pos(0, i + 1);
 785                                 break;
 786                         } else
 787                                 i--;  /* hack incremet */
 788                 }
 789         }
 790
 791         /* collapse (command...(command...)...) or {command...{command...}...} */
 792         c = 0;  /* "recursive" level */
 793         c2 = 0;
 794         for (i = 0; int_buf[i]; i++) {
 795                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 796                         if (int_buf[i] == '(')
 797                                 c++;
 798                         else
 799                                 c2++;
 800                         collapse_pos(0, i + 1);
 801                         i = -1;  /* hack incremet */
 802                 }
 803         }
 804         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) {
 805                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 806                         if (int_buf[i] == ')')
 807                                 c--;
 808                         else
 809                                 c2--;
 810                         collapse_pos(0, i + 1);
 811                         i = -1;  /* hack incremet */
 812                 }
 813         }
 814
 815         /* skip first not quote space */
 816         for (i = 0; int_buf[i]; i++)
 817                 if (int_buf[i] != ' ')
 818                         break;
 819         if (i)
 820                 collapse_pos(0, i);
 821
 822         /* set find mode for completion */
 823         command_mode = FIND_EXE_ONLY;
 824         for (i = 0; int_buf[i]; i++) {
 825                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 826                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 827                          && matchBuf[pos_buf[0]] == 'c'
 828                          && matchBuf[pos_buf[1]] == 'd'
 829                         ) {
 830                                 command_mode = FIND_DIR_ONLY;
 831                         } else {
 832                                 command_mode = FIND_FILE_ONLY;
 833                                 break;
 834                         }
 835                 }
 836         }
 837         for (i = 0; int_buf[i]; i++)
 838                 /* "strlen" */;
 839         /* find last word */
 840         for (--i; i >= 0; i--) {
 841                 c = int_buf[i];
 842                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 843                         collapse_pos(0, i + 1);
 844                         break;
 845                 }
 846         }
 847         /* skip first not quoted '\'' or '"' */
 848         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 849                 /*skip*/;
 850         /* collapse quote or unquote // or /~ */
 851         while ((int_buf[i] & ~QUOT) == '/'
 852          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 853         ) {
 854                 i++;
 855         }
 856
 857         /* set only match and destroy quotes */
 858         j = 0;
 859         for (c = 0; pos_buf[i] >= 0; i++) {
 860                 matchBuf[c++] = matchBuf[pos_buf[i]];
 861                 j = pos_buf[i] + 1;
 862         }
 863         matchBuf[c] = '\0';
 864         /* old length matchBuf with quotes symbols */
 865         *len_with_quotes = j ? j - pos_buf[0] : 0;
 866
 867         return command_mode;
 868 }
 869 #undef int_buf
 870 #undef pos_buf
 871
 872 /*
 873  * display by column (original idea from ls applet,
 874  * very optimized by me :)
 875  */
 876 static void showfiles(void)
 877 {
 878         int ncols, row;
 879         int column_width = 0;
 880         int nfiles = num_matches;
 881         int nrows = nfiles;
 882         int l;
 883
 884         /* find the longest file name - use that as the column width */
 885         for (row = 0; row < nrows; row++) {
 886                 l = bb_mbstrlen(matches[row]);
 887                 if (column_width < l)
 888                         column_width = l;
 889         }
 890         column_width += 2;              /* min space for columns */
 891         ncols = cmdedit_termw / column_width;
 892
 893         if (ncols > 1) {
 894                 nrows /= ncols;
 895                 if (nfiles % ncols)
 896                         nrows++;        /* round up fractionals */
 897         } else {
 898                 ncols = 1;
 899         }
 900         for (row = 0; row < nrows; row++) {
 901                 int n = row;
 902                 int nc;
 903
 904                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
 905                         printf("%s%-*s", matches[n],
 906                                 (int)(column_width - bb_mbstrlen(matches[n])), ""
 907                         );
 908                 }
 909                 puts(matches[n]);
 910         }
 911 }
 912
 913 static char *add_quote_for_spec_chars(char *found)
 914 {
 915         int l = 0;
 916         char *s = xzalloc((strlen(found) + 1) * 2);
 917
 918         while (*found) {
 919                 if (strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", *found))
 920                         s[l++] = '\\';
 921                 s[l++] = *found++;
 922         }
 923         /* s[l] = '\0'; - already is */
 924         return s;
 925 }
 926
 927 /* Do TAB completion */
 928 static void input_tab(smallint *lastWasTab)
 929 {
 930         if (!(state->flags & TAB_COMPLETION))
 931                 return;
 932
 933         if (!*lastWasTab) {
 934                 char *tmp, *tmp1;
 935                 size_t len_found;
 936 /*              char matchBuf[MAX_LINELEN]; */
 937 #define matchBuf (S.input_tab__matchBuf)
 938                 int find_type;
 939                 int recalc_pos;
 940 #if ENABLE_FEATURE_ASSUME_UNICODE
 941                 /* cursor pos in command converted to multibyte form */
 942                 int cursor_mb;
 943 #endif
 944
 945                 *lastWasTab = TRUE;             /* flop trigger */
 946
 947                 /* Make a local copy of the string --
 948                  * up to the position of the cursor */
 949                 save_string(matchBuf, cursor + 1);
 950 #if ENABLE_FEATURE_ASSUME_UNICODE
 951                 cursor_mb = strlen(matchBuf);
 952 #endif
 953                 tmp = matchBuf;
 954
 955                 find_type = find_match(matchBuf, &recalc_pos);
 956
 957                 /* Free up any memory already allocated */
 958                 free_tab_completion_data();
 959
 960 #if ENABLE_FEATURE_USERNAME_COMPLETION
 961                 /* If the word starts with `~' and there is no slash in the word,
 962                  * then try completing this word as a username. */
 963                 if (state->flags & USERNAME_COMPLETION)
 964                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
 965                                 username_tab_completion(matchBuf, NULL);
 966 #endif
 967                 /* Try to match any executable in our path and everything
 968                  * in the current working directory */
 969                 if (!matches)
 970                         exe_n_cwd_tab_completion(matchBuf, find_type);
 971                 /* Sort, then remove any duplicates found */
 972                 if (matches) {
 973                         unsigned i;
 974                         int n = 0;
 975                         qsort_string_vector(matches, num_matches);
 976                         for (i = 0; i < num_matches - 1; ++i) {
 977                                 if (matches[i] && matches[i+1]) { /* paranoia */
 978                                         if (strcmp(matches[i], matches[i+1]) == 0) {
 979                                                 free(matches[i]);
 980                                                 matches[i] = NULL; /* paranoia */
 981                                         } else {
 982                                                 matches[n++] = matches[i];
 983                                         }
 984                                 }
 985                         }
 986                         matches[n] = matches[i];
 987                         num_matches = n + 1;
 988                 }
 989                 /* Did we find exactly one match? */
 990                 if (!matches || num_matches > 1) { /* no */
 991                         beep();
 992                         if (!matches)
 993                                 return;         /* not found */
 994                         /* find minimal match */
 995                         tmp1 = xstrdup(matches[0]);
 996                         for (tmp = tmp1; *tmp; tmp++) {
 997                                 for (len_found = 1; len_found < num_matches; len_found++) {
 998                                         if (matches[len_found][tmp - tmp1] != *tmp) {
 999                                                 *tmp = '\0';
1000                                                 break;
1001                                         }
1002                                 }
1003                         }
1004                         if (*tmp1 == '\0') {        /* have unique */
1005                                 free(tmp1);
1006                                 return;
1007                         }
1008                         tmp = add_quote_for_spec_chars(tmp1);
1009                         free(tmp1);
1010                 } else {                        /* one match */
1011                         tmp = add_quote_for_spec_chars(matches[0]);
1012                         /* for next completion current found */
1013                         *lastWasTab = FALSE;
1014
1015                         len_found = strlen(tmp);
1016                         if (tmp[len_found-1] != '/') {
1017                                 tmp[len_found] = ' ';
1018                                 tmp[len_found+1] = '\0';
1019                         }
1020                 }
1021
1022                 len_found = strlen(tmp);
1023 #if !ENABLE_FEATURE_ASSUME_UNICODE
1024                 /* have space to place the match? */
1025                 /* The result consists of three parts with these lengths: */
1026                 /* (cursor - recalc_pos) + len_found + (command_len - cursor) */
1027                 /* it simplifies into: */
1028                 if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
1029                         /* save tail */
1030                         strcpy(matchBuf, command_ps + cursor);
1031                         /* add match and tail */
1032                         sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
1033                         command_len = strlen(command_ps);
1034                         /* new pos */
1035                         recalc_pos = cursor - recalc_pos + len_found;
1036                         /* write out the matched command */
1037                         redraw(cmdedit_y, command_len - recalc_pos);
1038                 }
1039 #else
1040                 {
1041                         char command[MAX_LINELEN];
1042                         int len = save_string(command, sizeof(command));
1043                         /* have space to place the match? */
1044                         /* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
1045                         if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
1046                                 /* save tail */
1047                                 strcpy(matchBuf, command + cursor_mb);
1048                                 /* where do we want to have cursor after all? */
1049                                 strcpy(&command[cursor_mb - recalc_pos], tmp);
1050                                 len = load_string(command, S.maxsize);
1051                                 /* add match and tail */
1052                                 sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
1053                                 command_len = load_string(command, S.maxsize);
1054                                 /* write out the matched command */
1055                                 redraw(cmdedit_y, command_len - len);
1056                         }
1057                 }
1058 #endif
1059                 free(tmp);
1060 #undef matchBuf
1061         } else {
1062                 /* Ok -- the last char was a TAB.  Since they
1063                  * just hit TAB again, print a list of all the
1064                  * available choices... */
1065                 if (matches && num_matches > 0) {
1066                         /* changed by goto_new_line() */
1067                         int sav_cursor = cursor;
1068
1069                         /* Go to the next line */
1070                         goto_new_line();
1071                         showfiles();
1072                         redraw(0, command_len - sav_cursor);
1073                 }
1074         }
1075 }
1076
1077 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
1078
1079
1080 line_input_t* FAST_FUNC new_line_input_t(int flags)
1081 {
1082         line_input_t *n = xzalloc(sizeof(*n));
1083         n->flags = flags;
1084         return n;
1085 }
1086
1087
1088 #if MAX_HISTORY > 0
1089
1090 static void save_command_ps_at_cur_history(void)
1091 {
1092         if (command_ps[0] != BB_NUL) {
1093                 int cur = state->cur_history;
1094                 free(state->history[cur]);
1095
1096 #if ENABLE_FEATURE_ASSUME_UNICODE
1097                 {
1098                         char tbuf[MAX_LINELEN];
1099                         save_string(tbuf, sizeof(tbuf));
1100                         state->history[cur] = xstrdup(tbuf);
1101                 }
1102 #else
1103                 state->history[cur] = xstrdup(command_ps);
1104 #endif
1105         }
1106 }
1107
1108 /* state->flags is already checked to be nonzero */
1109 static int get_previous_history(void)
1110 {
1111         if ((state->flags & DO_HISTORY) && state->cur_history) {
1112                 save_command_ps_at_cur_history();
1113                 state->cur_history--;
1114                 return 1;
1115         }
1116         beep();
1117         return 0;
1118 }
1119
1120 static int get_next_history(void)
1121 {
1122         if (state->flags & DO_HISTORY) {
1123                 if (state->cur_history < state->cnt_history) {
1124                         save_command_ps_at_cur_history(); /* save the current history line */
1125                         return ++state->cur_history;
1126                 }
1127         }
1128         beep();
1129         return 0;
1130 }
1131
1132 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1133 /* We try to ensure that concurrent additions to the history
1134  * do not overwrite each other.
1135  * Otherwise shell users get unhappy.
1136  *
1137  * History file is trimmed lazily, when it grows several times longer
1138  * than configured MAX_HISTORY lines.
1139  */
1140
1141 static void free_line_input_t(line_input_t *n)
1142 {
1143         int i = n->cnt_history;
1144         while (i > 0)
1145                 free(n->history[--i]);
1146         free(n);
1147 }
1148
1149 /* state->flags is already checked to be nonzero */
1150 static void load_history(line_input_t *st_parm)
1151 {
1152         char *temp_h[MAX_HISTORY];
1153         char *line;
1154         FILE *fp;
1155         unsigned idx, i, line_len;
1156
1157         /* NB: do not trash old history if file can't be opened */
1158
1159         fp = fopen_for_read(st_parm->hist_file);
1160         if (fp) {
1161                 /* clean up old history */
1162                 for (idx = st_parm->cnt_history; idx > 0;) {
1163                         idx--;
1164                         free(st_parm->history[idx]);
1165                         st_parm->history[idx] = NULL;
1166                 }
1167
1168                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1169                 memset(temp_h, 0, sizeof(temp_h));
1170                 st_parm->cnt_history_in_file = idx = 0;
1171                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1172                         if (line[0] == '\0') {
1173                                 free(line);
1174                                 continue;
1175                         }
1176                         free(temp_h[idx]);
1177                         temp_h[idx] = line;
1178                         st_parm->cnt_history_in_file++;
1179                         idx++;
1180                         if (idx == MAX_HISTORY)
1181                                 idx = 0;
1182                 }
1183                 fclose(fp);
1184
1185                 /* find first non-NULL temp_h[], if any */
1186                 if (st_parm->cnt_history_in_file) {
1187                         while (temp_h[idx] == NULL) {
1188                                 idx++;
1189                                 if (idx == MAX_HISTORY)
1190                                         idx = 0;
1191                         }
1192                 }
1193
1194                 /* copy temp_h[] to st_parm->history[] */
1195                 for (i = 0; i < MAX_HISTORY;) {
1196                         line = temp_h[idx];
1197                         if (!line)
1198                                 break;
1199                         idx++;
1200                         if (idx == MAX_HISTORY)
1201                                 idx = 0;
1202                         line_len = strlen(line);
1203                         if (line_len >= MAX_LINELEN)
1204                                 line[MAX_LINELEN-1] = '\0';
1205                         st_parm->history[i++] = line;
1206                 }
1207                 st_parm->cnt_history = i;
1208         }
1209 }
1210
1211 /* state->flags is already checked to be nonzero */
1212 static void save_history(char *str)
1213 {
1214         int fd;
1215         int len, len2;
1216
1217         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0666);
1218         if (fd < 0)
1219                 return;
1220         xlseek(fd, 0, SEEK_END); /* paranoia */
1221         len = strlen(str);
1222         str[len] = '\n'; /* we (try to) do atomic write */
1223         len2 = full_write(fd, str, len + 1);
1224         str[len] = '\0';
1225         close(fd);
1226         if (len2 != len + 1)
1227                 return; /* "wtf?" */
1228
1229         /* did we write so much that history file needs trimming? */
1230         state->cnt_history_in_file++;
1231         if (state->cnt_history_in_file > MAX_HISTORY * 4) {
1232                 FILE *fp;
1233                 char *new_name;
1234                 line_input_t *st_temp;
1235                 int i;
1236
1237                 /* we may have concurrently written entries from others.
1238                  * load them */
1239                 st_temp = new_line_input_t(state->flags);
1240                 st_temp->hist_file = state->hist_file;
1241                 load_history(st_temp);
1242
1243                 /* write out temp file and replace hist_file atomically */
1244                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1245                 fp = fopen_for_write(new_name);
1246                 if (fp) {
1247                         for (i = 0; i < st_temp->cnt_history; i++)
1248                                 fprintf(fp, "%s\n", st_temp->history[i]);
1249                         fclose(fp);
1250                         if (rename(new_name, state->hist_file) == 0)
1251                                 state->cnt_history_in_file = st_temp->cnt_history;
1252                 }
1253                 free(new_name);
1254                 free_line_input_t(st_temp);
1255         }
1256 }
1257 #else
1258 #define load_history(a) ((void)0)
1259 #define save_history(a) ((void)0)
1260 #endif /* FEATURE_COMMAND_SAVEHISTORY */
1261
1262 static void remember_in_history(char *str)
1263 {
1264         int i;
1265
1266         if (!(state->flags & DO_HISTORY))
1267                 return;
1268         if (str[0] == '\0')
1269                 return;
1270         i = state->cnt_history;
1271         /* Don't save dupes */
1272         if (i && strcmp(state->history[i-1], str) == 0)
1273                 return;
1274
1275         free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1276         state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1277
1278         /* If history[] is full, remove the oldest command */
1279         /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1280         if (i >= MAX_HISTORY) {
1281                 free(state->history[0]);
1282                 for (i = 0; i < MAX_HISTORY-1; i++)
1283                         state->history[i] = state->history[i+1];
1284                 /* i == MAX_HISTORY-1 */
1285         }
1286         /* i <= MAX_HISTORY-1 */
1287         state->history[i++] = xstrdup(str);
1288         /* i <= MAX_HISTORY */
1289         state->cur_history = i;
1290         state->cnt_history = i;
1291 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1292         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1293                 save_history(str);
1294 #endif
1295         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1296 }
1297
1298 #else /* MAX_HISTORY == 0 */
1299 #define remember_in_history(a) ((void)0)
1300 #endif /* MAX_HISTORY */
1301
1302
1303 /*
1304  * This function is used to grab a character buffer
1305  * from the input file descriptor and allows you to
1306  * a string with full command editing (sort of like
1307  * a mini readline).
1308  *
1309  * The following standard commands are not implemented:
1310  * ESC-b -- Move back one word
1311  * ESC-f -- Move forward one word
1312  * ESC-d -- Delete back one word
1313  * ESC-h -- Delete forward one word
1314  * CTL-t -- Transpose two characters
1315  *
1316  * Minimalist vi-style command line editing available if configured.
1317  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1318  */
1319
1320 #if ENABLE_FEATURE_EDITING_VI
1321 static void
1322 vi_Word_motion(int eat)
1323 {
1324         CHAR_T *command = command_ps;
1325
1326         while (cursor < command_len && !BB_isspace(command[cursor]))
1327                 input_forward();
1328         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1329                 input_forward();
1330 }
1331
1332 static void
1333 vi_word_motion(int eat)
1334 {
1335         CHAR_T *command = command_ps;
1336
1337         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1338                 while (cursor < command_len
1339                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1340                 ) {
1341                         input_forward();
1342                 }
1343         } else if (BB_ispunct(command[cursor])) {
1344                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1345                         input_forward();
1346         }
1347
1348         if (cursor < command_len)
1349                 input_forward();
1350
1351         if (eat) {
1352                 while (cursor < command_len && BB_isspace(command[cursor]))
1353                         input_forward();
1354         }
1355 }
1356
1357 static void
1358 vi_End_motion(void)
1359 {
1360         CHAR_T *command = command_ps;
1361
1362         input_forward();
1363         while (cursor < command_len && BB_isspace(command[cursor]))
1364                 input_forward();
1365         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1366                 input_forward();
1367 }
1368
1369 static void
1370 vi_end_motion(void)
1371 {
1372         CHAR_T *command = command_ps;
1373
1374         if (cursor >= command_len-1)
1375                 return;
1376         input_forward();
1377         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1378                 input_forward();
1379         if (cursor >= command_len-1)
1380                 return;
1381         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1382                 while (cursor < command_len-1
1383                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1384                 ) {
1385                         input_forward();
1386                 }
1387         } else if (BB_ispunct(command[cursor])) {
1388                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1389                         input_forward();
1390         }
1391 }
1392
1393 static void
1394 vi_Back_motion(void)
1395 {
1396         CHAR_T *command = command_ps;
1397
1398         while (cursor > 0 && BB_isspace(command[cursor-1]))
1399                 input_backward(1);
1400         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1401                 input_backward(1);
1402 }
1403
1404 static void
1405 vi_back_motion(void)
1406 {
1407         CHAR_T *command = command_ps;
1408
1409         if (cursor <= 0)
1410                 return;
1411         input_backward(1);
1412         while (cursor > 0 && BB_isspace(command[cursor]))
1413                 input_backward(1);
1414         if (cursor <= 0)
1415                 return;
1416         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1417                 while (cursor > 0
1418                  && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1419                 ) {
1420                         input_backward(1);
1421                 }
1422         } else if (BB_ispunct(command[cursor])) {
1423                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1424                         input_backward(1);
1425         }
1426 }
1427 #endif
1428
1429
1430 /*
1431  * read_line_input and its helpers
1432  */
1433
1434 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1435 static void parse_and_put_prompt(const char *prmt_ptr)
1436 {
1437         cmdedit_prompt = prmt_ptr;
1438         cmdedit_prmt_len = strlen(prmt_ptr);
1439         put_prompt();
1440 }
1441 #else
1442 static void parse_and_put_prompt(const char *prmt_ptr)
1443 {
1444         int prmt_len = 0;
1445         size_t cur_prmt_len = 0;
1446         char flg_not_length = '[';
1447         char *prmt_mem_ptr = xzalloc(1);
1448         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1449         char cbuf[2];
1450         char c;
1451         char *pbuf;
1452
1453         cmdedit_prmt_len = 0;
1454
1455         if (!cwd_buf) {
1456                 cwd_buf = (char *)bb_msg_unknown;
1457         }
1458
1459         cbuf[1] = '\0'; /* never changes */
1460
1461         while (*prmt_ptr) {
1462                 char *free_me = NULL;
1463
1464                 pbuf = cbuf;
1465                 c = *prmt_ptr++;
1466                 if (c == '\\') {
1467                         const char *cp = prmt_ptr;
1468                         int l;
1469
1470                         c = bb_process_escape_sequence(&prmt_ptr);
1471                         if (prmt_ptr == cp) {
1472                                 if (*cp == '\0')
1473                                         break;
1474                                 c = *prmt_ptr++;
1475
1476                                 switch (c) {
1477 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1478                                 case 'u':
1479                                         pbuf = user_buf ? user_buf : (char*)"";
1480                                         break;
1481 #endif
1482                                 case 'h':
1483                                         pbuf = free_me = safe_gethostname();
1484                                         *strchrnul(pbuf, '.') = '\0';
1485                                         break;
1486                                 case '$':
1487                                         c = (geteuid() == 0 ? '#' : '$');
1488                                         break;
1489 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1490                                 case 'w':
1491                                         /* /home/user[/something] -> ~[/something] */
1492                                         pbuf = cwd_buf;
1493                                         l = strlen(home_pwd_buf);
1494                                         if (l != 0
1495                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1496                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1497                                          && strlen(cwd_buf + l) < PATH_MAX
1498                                         ) {
1499                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1500                                         }
1501                                         break;
1502 #endif
1503                                 case 'W':
1504                                         pbuf = cwd_buf;
1505                                         cp = strrchr(pbuf, '/');
1506                                         if (cp != NULL && cp != pbuf)
1507                                                 pbuf += (cp-pbuf) + 1;
1508                                         break;
1509                                 case '!':
1510                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1511                                         break;
1512                                 case 'e': case 'E':     /* \e \E = \033 */
1513                                         c = '\033';
1514                                         break;
1515                                 case 'x': case 'X': {
1516                                         char buf2[4];
1517                                         for (l = 0; l < 3;) {
1518                                                 unsigned h;
1519                                                 buf2[l++] = *prmt_ptr;
1520                                                 buf2[l] = '\0';
1521                                                 h = strtoul(buf2, &pbuf, 16);
1522                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1523                                                         buf2[--l] = '\0';
1524                                                         break;
1525                                                 }
1526                                                 prmt_ptr++;
1527                                         }
1528                                         c = (char)strtoul(buf2, NULL, 16);
1529                                         if (c == 0)
1530                                                 c = '?';
1531                                         pbuf = cbuf;
1532                                         break;
1533                                 }
1534                                 case '[': case ']':
1535                                         if (c == flg_not_length) {
1536                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1537                                                 continue;
1538                                         }
1539                                         break;
1540                                 } /* switch */
1541                         } /* if */
1542                 } /* if */
1543                 cbuf[0] = c;
1544                 cur_prmt_len = strlen(pbuf);
1545                 prmt_len += cur_prmt_len;
1546                 if (flg_not_length != ']')
1547                         cmdedit_prmt_len += cur_prmt_len;
1548                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1549                 free(free_me);
1550         } /* while */
1551
1552         if (cwd_buf != (char *)bb_msg_unknown)
1553                 free(cwd_buf);
1554         cmdedit_prompt = prmt_mem_ptr;
1555         put_prompt();
1556 }
1557 #endif
1558
1559 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1560 {
1561         cmdedit_termw = w;
1562         if (redraw_flg) {
1563                 /* new y for current cursor */
1564                 int new_y = (cursor + cmdedit_prmt_len) / w;
1565                 /* redraw */
1566                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1567                 fflush(stdout);
1568         }
1569 }
1570
1571 static void win_changed(int nsig)
1572 {
1573         unsigned width;
1574         get_terminal_width_height(0, &width, NULL);
1575         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1576         if (nsig == SIGWINCH)
1577                 signal(SIGWINCH, win_changed); /* rearm ourself */
1578 }
1579
1580 static int lineedit_read_key(char *read_key_buffer)
1581 {
1582         int64_t ic;
1583         struct pollfd pfd;
1584         int delay = -1;
1585 #if ENABLE_FEATURE_ASSUME_UNICODE
1586         char unicode_buf[MB_CUR_MAX + 1];
1587         int unicode_idx = 0;
1588 #endif
1589
1590         pfd.fd = STDIN_FILENO;
1591         pfd.events = POLLIN;
1592         do {
1593  poll_again:
1594                 if (read_key_buffer[0] == 0) {
1595                         /* Wait for input. Can't just call read_key,
1596                          * it returns at once if stdin
1597                          * is in non-blocking mode. */
1598                         safe_poll(&pfd, 1, delay);
1599                 }
1600                 /* Note: read_key sets errno to 0 on success: */
1601                 ic = read_key(STDIN_FILENO, read_key_buffer);
1602                 if (ENABLE_FEATURE_EDITING_ASK_TERMINAL
1603                  && (int32_t)ic == KEYCODE_CURSOR_POS
1604                 ) {
1605                         int col = ((ic >> 32) & 0x7fff) - 1;
1606                         if (col > cmdedit_prmt_len) {
1607                                 cmdedit_x += (col - cmdedit_prmt_len);
1608                                 while (cmdedit_x >= cmdedit_termw) {
1609                                         cmdedit_x -= cmdedit_termw;
1610                                         cmdedit_y++;
1611                                 }
1612                         }
1613                         goto poll_again;
1614                 }
1615
1616 #if ENABLE_FEATURE_ASSUME_UNICODE
1617                 {
1618                         wchar_t wc;
1619
1620                         if ((int32_t)ic < 0) /* KEYCODE_xxx */
1621                                 return ic;
1622                         unicode_buf[unicode_idx++] = ic;
1623                         unicode_buf[unicode_idx] = '\0';
1624                         if (mbstowcs(&wc, unicode_buf, 1) != 1 && unicode_idx < MB_CUR_MAX) {
1625                                 delay = 50;
1626                                 goto poll_again;
1627                         }
1628                         ic = wc;
1629                 }
1630 #endif
1631         } while (errno == EAGAIN);
1632
1633         return ic;
1634 }
1635
1636 /* leave out the "vi-mode"-only case labels if vi editing isn't
1637  * configured. */
1638 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
1639
1640 /* convert uppercase ascii to equivalent control char, for readability */
1641 #undef CTRL
1642 #define CTRL(a) ((a) & ~0x40)
1643
1644 /* maxsize must be >= 2.
1645  * Returns:
1646  * -1 on read errors or EOF, or on bare Ctrl-D,
1647  * 0  on ctrl-C (the line entered is still returned in 'command'),
1648  * >0 length of input string, including terminating '\n'
1649  */
1650 int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1651 {
1652         int len;
1653 #if ENABLE_FEATURE_TAB_COMPLETION
1654         smallint lastWasTab = FALSE;
1655 #endif
1656         smallint break_out = 0;
1657 #if ENABLE_FEATURE_EDITING_VI
1658         smallint vi_cmdmode = 0;
1659 #endif
1660         struct termios initial_settings;
1661         struct termios new_settings;
1662         char read_key_buffer[KEYCODE_BUFFER_SIZE];
1663
1664         INIT_S();
1665
1666         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1667          || !(initial_settings.c_lflag & ECHO)
1668         ) {
1669                 /* Happens when e.g. stty -echo was run before */
1670                 parse_and_put_prompt(prompt);
1671                 fflush(stdout);
1672                 if (fgets(command, maxsize, stdin) == NULL)
1673                         len = -1; /* EOF or error */
1674                 else
1675                         len = strlen(command);
1676                 DEINIT_S();
1677                 return len;
1678         }
1679
1680         check_unicode_in_env();
1681
1682 // FIXME: audit & improve this
1683         if (maxsize > MAX_LINELEN)
1684                 maxsize = MAX_LINELEN;
1685         S.maxsize = maxsize;
1686
1687         /* With null flags, no other fields are ever used */
1688         state = st ? st : (line_input_t*) &const_int_0;
1689 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1690         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1691                 if (state->cnt_history == 0)
1692                         load_history(state);
1693 #endif
1694         if (state->flags & DO_HISTORY)
1695                 state->cur_history = state->cnt_history;
1696
1697         /* prepare before init handlers */
1698         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1699         command_len = 0;
1700 #if ENABLE_FEATURE_ASSUME_UNICODE
1701         command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
1702 #else
1703         command_ps = command;
1704         command[0] = '\0';
1705 #endif
1706 #define command command_must_not_be_used
1707
1708         new_settings = initial_settings;
1709         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1710         /* Turn off echoing and CTRL-C, so we can trap it */
1711         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1712         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1713         new_settings.c_cc[VMIN] = 1;
1714         new_settings.c_cc[VTIME] = 0;
1715         /* Turn off CTRL-C, so we can trap it */
1716 #ifndef _POSIX_VDISABLE
1717 #define _POSIX_VDISABLE '\0'
1718 #endif
1719         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1720         tcsetattr_stdin_TCSANOW(&new_settings);
1721
1722         /* Now initialize things */
1723         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1724         win_changed(0); /* do initial resizing */
1725 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1726         {
1727                 struct passwd *entry;
1728
1729                 entry = getpwuid(geteuid());
1730                 if (entry) {
1731                         user_buf = xstrdup(entry->pw_name);
1732                         home_pwd_buf = xstrdup(entry->pw_dir);
1733                 }
1734         }
1735 #endif
1736
1737 #if 0
1738         for (i = 0; i <= MAX_HISTORY; i++)
1739                 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
1740         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
1741 #endif
1742
1743         /* Print out the command prompt */
1744         parse_and_put_prompt(prompt);
1745
1746         read_key_buffer[0] = 0;
1747         while (1) {
1748                 /*
1749                  * The emacs and vi modes share much of the code in the big
1750                  * command loop.  Commands entered when in vi's command mode
1751                  * (aka "escape mode") get an extra bit added to distinguish
1752                  * them - this keeps them from being self-inserted. This
1753                  * clutters the big switch a bit, but keeps all the code
1754                  * in one place.
1755                  */
1756                 enum {
1757                         VI_CMDMODE_BIT = 0x40000000,
1758                         /* 0x80000000 bit flags KEYCODE_xxx */
1759                 };
1760                 int32_t ic;
1761
1762                 fflush(NULL);
1763                 ic = lineedit_read_key(read_key_buffer);
1764
1765 #if ENABLE_FEATURE_EDITING_VI
1766                 newdelflag = 1;
1767                 if (vi_cmdmode) {
1768                         /* btw, since KEYCODE_xxx are all < 0, this doesn't
1769                          * change ic if it contains one of them: */
1770                         ic |= VI_CMDMODE_BIT;
1771                 }
1772 #endif
1773
1774                 switch (ic) {
1775                 case '\n':
1776                 case '\r':
1777                 vi_case('\n'|VI_CMDMODE_BIT:)
1778                 vi_case('\r'|VI_CMDMODE_BIT:)
1779                         /* Enter */
1780                         goto_new_line();
1781                         break_out = 1;
1782                         break;
1783                 case CTRL('A'):
1784                 vi_case('0'|VI_CMDMODE_BIT:)
1785                         /* Control-a -- Beginning of line */
1786                         input_backward(cursor);
1787                         break;
1788                 case CTRL('B'):
1789                 vi_case('h'|VI_CMDMODE_BIT:)
1790                 vi_case('\b'|VI_CMDMODE_BIT:)
1791                 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
1792                         /* Control-b -- Move back one character */
1793                         input_backward(1);
1794                         break;
1795                 case CTRL('C'):
1796                 vi_case(CTRL('C')|VI_CMDMODE_BIT:)
1797                         /* Control-c -- stop gathering input */
1798                         goto_new_line();
1799                         command_len = 0;
1800                         break_out = -1; /* "do not append '\n'" */
1801                         break;
1802                 case CTRL('D'):
1803                         /* Control-d -- Delete one character, or exit
1804                          * if the len=0 and no chars to delete */
1805                         if (command_len == 0) {
1806                                 errno = 0;
1807 #if ENABLE_FEATURE_EDITING_VI
1808  prepare_to_die:
1809 #endif
1810                                 /* to control stopped jobs */
1811                                 break_out = command_len = -1;
1812                                 break;
1813                         }
1814                         input_delete(0);
1815                         break;
1816                 case CTRL('E'):
1817                 vi_case('$'|VI_CMDMODE_BIT:)
1818                         /* Control-e -- End of line */
1819                         input_end();
1820                         break;
1821                 case CTRL('F'):
1822                 vi_case('l'|VI_CMDMODE_BIT:)
1823                 vi_case(' '|VI_CMDMODE_BIT:)
1824                         /* Control-f -- Move forward one character */
1825                         input_forward();
1826                         break;
1827                 case '\b':
1828                 case '\x7f': /* DEL */
1829                         /* Control-h and DEL */
1830                         input_backspace();
1831                         break;
1832 #if ENABLE_FEATURE_TAB_COMPLETION
1833                 case '\t':
1834                         input_tab(&lastWasTab);
1835                         break;
1836 #endif
1837                 case CTRL('K'):
1838                         /* Control-k -- clear to end of line */
1839                         command_ps[cursor] = BB_NUL;
1840                         command_len = cursor;
1841                         printf("\033[J");
1842                         break;
1843                 case CTRL('L'):
1844                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
1845                         /* Control-l -- clear screen */
1846                         printf("\033[H");
1847                         redraw(0, command_len - cursor);
1848                         break;
1849 #if MAX_HISTORY > 0
1850                 case CTRL('N'):
1851                 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
1852                 vi_case('j'|VI_CMDMODE_BIT:)
1853                         /* Control-n -- Get next command in history */
1854                         if (get_next_history())
1855                                 goto rewrite_line;
1856                         break;
1857                 case CTRL('P'):
1858                 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
1859                 vi_case('k'|VI_CMDMODE_BIT:)
1860                         /* Control-p -- Get previous command from history */
1861                         if (get_previous_history())
1862                                 goto rewrite_line;
1863                         break;
1864 #endif
1865                 case CTRL('U'):
1866                 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
1867                         /* Control-U -- Clear line before cursor */
1868                         if (cursor) {
1869                                 command_len -= cursor;
1870                                 memmove(command_ps, command_ps + cursor,
1871                                         (command_len + 1) * sizeof(command_ps[0]));
1872                                 redraw(cmdedit_y, command_len);
1873                         }
1874                         break;
1875                 case CTRL('W'):
1876                 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
1877                         /* Control-W -- Remove the last word */
1878                         while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
1879                                 input_backspace();
1880                         while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
1881                                 input_backspace();
1882                         break;
1883
1884 #if ENABLE_FEATURE_EDITING_VI
1885                 case 'i'|VI_CMDMODE_BIT:
1886                         vi_cmdmode = 0;
1887                         break;
1888                 case 'I'|VI_CMDMODE_BIT:
1889                         input_backward(cursor);
1890                         vi_cmdmode = 0;
1891                         break;
1892                 case 'a'|VI_CMDMODE_BIT:
1893                         input_forward();
1894                         vi_cmdmode = 0;
1895                         break;
1896                 case 'A'|VI_CMDMODE_BIT:
1897                         input_end();
1898                         vi_cmdmode = 0;
1899                         break;
1900                 case 'x'|VI_CMDMODE_BIT:
1901                         input_delete(1);
1902                         break;
1903                 case 'X'|VI_CMDMODE_BIT:
1904                         if (cursor > 0) {
1905                                 input_backward(1);
1906                                 input_delete(1);
1907                         }
1908                         break;
1909                 case 'W'|VI_CMDMODE_BIT:
1910                         vi_Word_motion(1);
1911                         break;
1912                 case 'w'|VI_CMDMODE_BIT:
1913                         vi_word_motion(1);
1914                         break;
1915                 case 'E'|VI_CMDMODE_BIT:
1916                         vi_End_motion();
1917                         break;
1918                 case 'e'|VI_CMDMODE_BIT:
1919                         vi_end_motion();
1920                         break;
1921                 case 'B'|VI_CMDMODE_BIT:
1922                         vi_Back_motion();
1923                         break;
1924                 case 'b'|VI_CMDMODE_BIT:
1925                         vi_back_motion();
1926                         break;
1927                 case 'C'|VI_CMDMODE_BIT:
1928                         vi_cmdmode = 0;
1929                         /* fall through */
1930                 case 'D'|VI_CMDMODE_BIT:
1931                         goto clear_to_eol;
1932
1933                 case 'c'|VI_CMDMODE_BIT:
1934                         vi_cmdmode = 0;
1935                         /* fall through */
1936                 case 'd'|VI_CMDMODE_BIT: {
1937                         int nc, sc;
1938                         int prev_ic;
1939
1940                         sc = cursor;
1941                         prev_ic = ic;
1942
1943                         ic = lineedit_read_key(read_key_buffer);
1944                         if (errno) /* error */
1945                                 goto prepare_to_die;
1946
1947                         if ((ic | VI_CMDMODE_BIT) == prev_ic) {
1948                                 /* "cc", "dd" */
1949                                 input_backward(cursor);
1950                                 goto clear_to_eol;
1951                                 break;
1952                         }
1953                         switch (ic) {
1954                         case 'w':
1955                         case 'W':
1956                         case 'e':
1957                         case 'E':
1958                                 switch (ic) {
1959                                 case 'w':   /* "dw", "cw" */
1960                                         vi_word_motion(vi_cmdmode);
1961                                         break;
1962                                 case 'W':   /* 'dW', 'cW' */
1963                                         vi_Word_motion(vi_cmdmode);
1964                                         break;
1965                                 case 'e':   /* 'de', 'ce' */
1966                                         vi_end_motion();
1967                                         input_forward();
1968                                         break;
1969                                 case 'E':   /* 'dE', 'cE' */
1970                                         vi_End_motion();
1971                                         input_forward();
1972                                         break;
1973                                 }
1974                                 nc = cursor;
1975                                 input_backward(cursor - sc);
1976                                 while (nc-- > cursor)
1977                                         input_delete(1);
1978                                 break;
1979                         case 'b':  /* "db", "cb" */
1980                         case 'B':  /* implemented as B */
1981                                 if (ic == 'b')
1982                                         vi_back_motion();
1983                                 else
1984                                         vi_Back_motion();
1985                                 while (sc-- > cursor)
1986                                         input_delete(1);
1987                                 break;
1988                         case ' ':  /* "d ", "c " */
1989                                 input_delete(1);
1990                                 break;
1991                         case '$':  /* "d$", "c$" */
1992  clear_to_eol:
1993                                 while (cursor < command_len)
1994                                         input_delete(1);
1995                                 break;
1996                         }
1997                         break;
1998                 }
1999                 case 'p'|VI_CMDMODE_BIT:
2000                         input_forward();
2001                         /* fallthrough */
2002                 case 'P'|VI_CMDMODE_BIT:
2003                         put();
2004                         break;
2005                 case 'r'|VI_CMDMODE_BIT:
2006                         ic = lineedit_read_key(read_key_buffer);
2007                         if (errno) /* error */
2008                                 goto prepare_to_die;
2009                         if (ic < ' ' || ic > 255) {
2010                                 beep();
2011                         } else {
2012                                 command_ps[cursor] = ic;
2013                                 bb_putchar(ic);
2014                                 bb_putchar('\b');
2015                         }
2016                         break;
2017                 case '\x1b': /* ESC */
2018                         if (state->flags & VI_MODE) {
2019                                 /* insert mode --> command mode */
2020                                 vi_cmdmode = 1;
2021                                 input_backward(1);
2022                         }
2023                         break;
2024 #endif /* FEATURE_COMMAND_EDITING_VI */
2025
2026 #if MAX_HISTORY > 0
2027                 case KEYCODE_UP:
2028                         if (get_previous_history())
2029                                 goto rewrite_line;
2030                         beep();
2031                         break;
2032                 case KEYCODE_DOWN:
2033                         if (!get_next_history())
2034                                 break;
2035  rewrite_line:
2036                         /* Rewrite the line with the selected history item */
2037                         /* change command */
2038                         command_len = load_string(state->history[state->cur_history] ? : "", maxsize);
2039                         /* redraw and go to eol (bol, in vi) */
2040                         redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2041                         break;
2042 #endif
2043                 case KEYCODE_RIGHT:
2044                         input_forward();
2045                         break;
2046                 case KEYCODE_LEFT:
2047                         input_backward(1);
2048                         break;
2049                 case KEYCODE_DELETE:
2050                         input_delete(0);
2051                         break;
2052                 case KEYCODE_HOME:
2053                         input_backward(cursor);
2054                         break;
2055                 case KEYCODE_END:
2056                         input_end();
2057                         break;
2058
2059                 default:
2060 //                      /* Control-V -- force insert of next char */
2061 //                      if (c == CTRL('V')) {
2062 //                              if (safe_read(STDIN_FILENO, &c, 1) < 1)
2063 //                                      goto prepare_to_die;
2064 //                              if (c == 0) {
2065 //                                      beep();
2066 //                                      break;
2067 //                              }
2068 //                      }
2069                         if (ic < ' '
2070                          || (!ENABLE_FEATURE_ASSUME_UNICODE && ic >= 256)
2071                          || (ENABLE_FEATURE_ASSUME_UNICODE && ic >= VI_CMDMODE_BIT)
2072                         ) {
2073                                 /* If VI_CMDMODE_BIT is set, ic is >= 256
2074                                  * and command mode ignores unexpected chars.
2075                                  * Otherwise, we are here if ic is a
2076                                  * control char or an unhandled ESC sequence,
2077                                  * which is also ignored.
2078                                  */
2079                                 break;
2080                         }
2081                         if ((int)command_len >= (maxsize - 2)) {
2082                                 /* Not enough space for the char and EOL */
2083                                 break;
2084                         }
2085
2086                         command_len++;
2087                         if (cursor == (command_len - 1)) {
2088                                 /* We are at the end, append */
2089                                 command_ps[cursor] = ic;
2090                                 command_ps[cursor + 1] = BB_NUL;
2091                                 cmdedit_set_out_char(' ');
2092                         } else {
2093                                 /* In the middle, insert */
2094                                 int sc = cursor;
2095
2096                                 memmove(command_ps + sc + 1, command_ps + sc,
2097                                         (command_len - sc) * sizeof(command_ps[0]));
2098                                 command_ps[sc] = ic;
2099                                 sc++;
2100                                 /* rewrite from cursor */
2101                                 input_end();
2102                                 /* to prev x pos + 1 */
2103                                 input_backward(cursor - sc);
2104                         }
2105                         break;
2106                 } /* switch (input_key) */
2107
2108                 if (break_out)
2109                         break;
2110
2111 #if ENABLE_FEATURE_TAB_COMPLETION
2112                 ic &= ~VI_CMDMODE_BIT;
2113                 if (ic != '\t')
2114                         lastWasTab = FALSE;
2115 #endif
2116         } /* while (1) */
2117
2118 /* Stop bug catching using "command_must_not_be_used" trick */
2119 #undef command
2120
2121 #if ENABLE_FEATURE_ASSUME_UNICODE
2122         command_len = save_string(command, maxsize - 1);
2123         free(command_ps);
2124 #endif
2125
2126         if (command_len > 0)
2127                 remember_in_history(command);
2128
2129         if (break_out > 0) {
2130                 command[command_len++] = '\n';
2131                 command[command_len] = '\0';
2132         }
2133
2134 #if ENABLE_FEATURE_TAB_COMPLETION
2135         free_tab_completion_data();
2136 #endif
2137
2138         /* restore initial_settings */
2139         tcsetattr_stdin_TCSANOW(&initial_settings);
2140         /* restore SIGWINCH handler */
2141         signal(SIGWINCH, previous_SIGWINCH_handler);
2142         fflush(stdout);
2143
2144         len = command_len;
2145         DEINIT_S();
2146
2147         return len; /* can't return command_len, DEINIT_S() destroys it */
2148 }
2149
2150 #else
2151
2152 #undef read_line_input
2153 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2154 {
2155         fputs(prompt, stdout);
2156         fflush(stdout);
2157         fgets(command, maxsize, stdin);
2158         return strlen(command);
2159 }
2160
2161 #endif  /* FEATURE_EDITING */
2162
2163
2164 /*
2165  * Testing
2166  */
2167
2168 #ifdef TEST
2169
2170 #include <locale.h>
2171
2172 const char *applet_name = "debug stuff usage";
2173
2174 int main(int argc, char **argv)
2175 {
2176         char buff[MAX_LINELEN];
2177         char *prompt =
2178 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2179                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2180                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2181                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2182 #else
2183                 "% ";
2184 #endif
2185
2186 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
2187         setlocale(LC_ALL, "");
2188 #endif
2189         while (1) {
2190                 int l;
2191                 l = read_line_input(prompt, buff);
2192                 if (l <= 0 || buff[l-1] != '\n')
2193                         break;
2194                 buff[l-1] = 0;
2195                 printf("*** read_line_input() returned line =%s=\n", buff);
2196         }
2197         printf("*** read_line_input() detect ^D\n");
2198         return 0;
2199 }
2200
2201 #endif  /* TEST */