libbb/lineedit.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Termios command line History and Editing.
   4  *
   5  * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
   6  * Written by:   Vladimir Oleynik <dzo@simtreas.ru>
   7  *
   8  * Used ideas:
   9  *      Adam Rogoyski    <rogoyski@cs.utexas.edu>
  10  *      Dave Cinege      <dcinege@psychosis.com>
  11  *      Jakub Jelinek (c) 1995
  12  *      Erik Andersen    <andersen@codepoet.org> (Majorly adjusted for busybox)
  13  *
  14  * This code is 'as is' with no warranty.
  15  */
  16
  17 /*
  18  * Usage and known bugs:
  19  * Terminal key codes are not extensive, more needs to be added.
  20  * This version was created on Debian GNU/Linux 2.x.
  21  * Delete, Backspace, Home, End, and the arrow keys were tested
  22  * to work in an Xterm and console. Ctrl-A also works as Home.
  23  * Ctrl-E also works as End.
  24  *
  25  * The following readline-like commands are not implemented:
  26  * ESC-b -- Move back one word
  27  * ESC-f -- Move forward one word
  28  * ESC-d -- Delete forward one word
  29  * CTL-t -- Transpose two characters
  30  *
  31  * lineedit does not know that the terminal escape sequences do not
  32  * take up space on the screen. The redisplay code assumes, unless
  33  * told otherwise, that each character in the prompt is a printable
  34  * character that takes up one character position on the screen.
  35  * You need to tell lineedit that some sequences of characters
  36  * in the prompt take up no screen space. Compatibly with readline,
  37  * use the \[ escape to begin a sequence of non-printing characters,
  38  * and the \] escape to signal the end of such a sequence. Example:
  39  *
  40  * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
  41  */
  42 #include "libbb.h"
  43 #include "unicode.h"
  44
  45 /* FIXME: obsolete CONFIG item? */
  46 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  47
  48 #ifdef TEST
  49 # define ENABLE_FEATURE_EDITING 0
  50 # define ENABLE_FEATURE_TAB_COMPLETION 0
  51 # define ENABLE_FEATURE_USERNAME_COMPLETION 0
  52 # define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  53 #endif
  54
  55
  56 /* Entire file (except TESTing part) sits inside this #if */
  57 #if ENABLE_FEATURE_EDITING
  58
  59
  60 #define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
  61         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  62 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
  63 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  64 #undef IF_FEATURE_GETUSERNAME_AND_HOMEDIR
  65 #define IF_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
  66 #endif
  67
  68
  69 #undef CHAR_T
  70 #if ENABLE_FEATURE_ASSUME_UNICODE
  71 # define BB_NUL L'\0'
  72 # define CHAR_T wchar_t
  73 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
  74 static bool BB_isalnum(CHAR_T c) { return ((unsigned)c < 256 && isalnum(c)); }
  75 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
  76 # undef isspace
  77 # undef isalnum
  78 # undef ispunct
  79 # undef isprint
  80 # define isspace isspace_must_not_be_used
  81 # define isalnum isalnum_must_not_be_used
  82 # define ispunct ispunct_must_not_be_used
  83 # define isprint isprint_must_not_be_used
  84 #else
  85 # define BB_NUL '\0'
  86 # define CHAR_T char
  87 # define BB_isspace(c) isspace(c)
  88 # define BB_isalnum(c) isalnum(c)
  89 # define BB_ispunct(c) ispunct(c)
  90 #endif
  91
  92
  93 enum {
  94         /* We use int16_t for positions, need to limit line len */
  95         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
  96                       ? CONFIG_FEATURE_EDITING_MAX_LEN
  97                       : 0x7ff0
  98 };
  99
 100 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 101 static const char null_str[] ALIGN1 = "";
 102 #endif
 103
 104 /* We try to minimize both static and stack usage. */
 105 struct lineedit_statics {
 106         line_input_t *state;
 107
 108         volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
 109         sighandler_t previous_SIGWINCH_handler;
 110
 111         unsigned cmdedit_x;        /* real x (col) terminal position */
 112         unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
 113         unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
 114
 115         unsigned cursor;
 116         int command_len; /* must be signed */
 117         /* signed maxsize: we want x in "if (x > S.maxsize)"
 118          * to _not_ be promoted to unsigned */
 119         int maxsize;
 120         CHAR_T *command_ps;
 121
 122         const char *cmdedit_prompt;
 123 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 124         int num_ok_lines; /* = 1; */
 125 #endif
 126
 127 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 128         char *user_buf;
 129         char *home_pwd_buf; /* = (char*)null_str; */
 130 #endif
 131
 132 #if ENABLE_FEATURE_TAB_COMPLETION
 133         char **matches;
 134         unsigned num_matches;
 135 #endif
 136
 137 #if ENABLE_FEATURE_EDITING_VI
 138 #define DELBUFSIZ 128
 139         CHAR_T *delptr;
 140         smallint newdelflag;     /* whether delbuf should be reused yet */
 141         CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 142 #endif
 143 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 144         smallint sent_ESC_br_n6;
 145 #endif
 146
 147         /* Formerly these were big buffers on stack: */
 148 #if ENABLE_FEATURE_TAB_COMPLETION
 149         char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
 150         char input_tab__matchBuf[MAX_LINELEN];
 151         int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
 152         int16_t find_match__pos_buf[MAX_LINELEN + 1];
 153 #endif
 154 };
 155
 156 /* See lineedit_ptr_hack.c */
 157 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 158
 159 #define S (*lineedit_ptr_to_statics)
 160 #define state            (S.state           )
 161 #define cmdedit_termw    (S.cmdedit_termw   )
 162 #define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
 163 #define cmdedit_x        (S.cmdedit_x       )
 164 #define cmdedit_y        (S.cmdedit_y       )
 165 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 166 #define cursor           (S.cursor          )
 167 #define command_len      (S.command_len     )
 168 #define command_ps       (S.command_ps      )
 169 #define cmdedit_prompt   (S.cmdedit_prompt  )
 170 #define num_ok_lines     (S.num_ok_lines    )
 171 #define user_buf         (S.user_buf        )
 172 #define home_pwd_buf     (S.home_pwd_buf    )
 173 #define matches          (S.matches         )
 174 #define num_matches      (S.num_matches     )
 175 #define delptr           (S.delptr          )
 176 #define newdelflag       (S.newdelflag      )
 177 #define delbuf           (S.delbuf          )
 178
 179 #define INIT_S() do { \
 180         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 181         barrier(); \
 182         cmdedit_termw = 80; \
 183         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
 184         IF_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 185 } while (0)
 186 static void deinit_S(void)
 187 {
 188 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 189         /* This one is allocated only if FANCY_PROMPT is on
 190          * (otherwise it points to verbatim prompt (NOT malloced) */
 191         free((char*)cmdedit_prompt);
 192 #endif
 193 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 194         free(user_buf);
 195         if (home_pwd_buf != null_str)
 196                 free(home_pwd_buf);
 197 #endif
 198         free(lineedit_ptr_to_statics);
 199 }
 200 #define DEINIT_S() deinit_S()
 201
 202
 203 #if ENABLE_FEATURE_ASSUME_UNICODE
 204 static size_t load_string(const char *src, int maxsize)
 205 {
 206         ssize_t len = mbstowcs(command_ps, src, maxsize - 1);
 207         if (len < 0)
 208                 len = 0;
 209         command_ps[len] = L'\0';
 210         return len;
 211 }
 212 static size_t save_string(char *dst, int maxsize)
 213 {
 214         ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
 215         if (len < 0)
 216                 len = 0;
 217         dst[len] = '\0';
 218         return len;
 219 }
 220 /* I thought just fputwc(c, stdout) would work. But no... */
 221 static void BB_PUTCHAR(wchar_t c)
 222 {
 223         char buf[MB_CUR_MAX + 1];
 224         mbstate_t mbst = { 0 };
 225         ssize_t len = wcrtomb(buf, c, &mbst);
 226
 227         if (len > 0) {
 228                 buf[len] = '\0';
 229                 fputs(buf, stdout);
 230         }
 231 }
 232 #else
 233 static size_t load_string(const char *src, int maxsize)
 234 {
 235         safe_strncpy(command_ps, src, maxsize);
 236         return strlen(command_ps);
 237 }
 238 # if ENABLE_FEATURE_TAB_COMPLETION
 239 static void save_string(char *dst, int maxsize)
 240 {
 241         safe_strncpy(dst, command_ps, maxsize);
 242 }
 243 # endif
 244 # define BB_PUTCHAR(c) bb_putchar(c)
 245 #endif
 246
 247
 248 /* Put 'command_ps[cursor]', cursor++.
 249  * Advance cursor on screen. If we reached right margin, scroll text up
 250  * and remove terminal margin effect by printing 'next_char' */
 251 #define HACK_FOR_WRONG_WIDTH 1
 252 #if HACK_FOR_WRONG_WIDTH
 253 static void cmdedit_set_out_char(void)
 254 #define cmdedit_set_out_char(next_char) cmdedit_set_out_char()
 255 #else
 256 static void cmdedit_set_out_char(int next_char)
 257 #endif
 258 {
 259         CHAR_T c = command_ps[cursor];
 260
 261         if (c == BB_NUL) {
 262                 /* erase character after end of input string */
 263                 c = ' ';
 264         }
 265 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 266         /* Display non-printable characters in reverse */
 267         if (!BB_isprint(c)) {
 268                 if (c >= 128)
 269                         c -= 128;
 270                 if (c < ' ')
 271                         c += '@';
 272                 if (c == 127)
 273                         c = '?';
 274                 printf("\033[7m%c\033[0m", c);
 275         } else
 276 #endif
 277         {
 278                 BB_PUTCHAR(c);
 279         }
 280         if (++cmdedit_x >= cmdedit_termw) {
 281                 /* terminal is scrolled down */
 282                 cmdedit_y++;
 283                 cmdedit_x = 0;
 284 #if HACK_FOR_WRONG_WIDTH
 285                 /* This works better if our idea of term width is wrong
 286                  * and it is actually wider (often happens on serial lines).
 287                  * Printing CR,LF *forces* cursor to next line.
 288                  * OTOH if terminal width is correct AND terminal does NOT
 289                  * have automargin (IOW: it is moving cursor to next line
 290                  * by itself (which is wrong for VT-10x terminals)),
 291                  * this will break things: there will be one extra empty line */
 292                 puts("\r"); /* + implicit '\n' */
 293 #else
 294                 /* Works ok only if cmdedit_termw is correct */
 295                 /* destroy "(auto)margin" */
 296                 bb_putchar(next_char);
 297                 bb_putchar('\b');
 298 #endif
 299         }
 300 // Huh? What if command_ps[cursor] == BB_NUL (we are at the end already?)
 301         cursor++;
 302 }
 303
 304 /* Move to end of line (by printing all chars till the end) */
 305 static void input_end(void)
 306 {
 307         while (cursor < command_len)
 308                 cmdedit_set_out_char(' ');
 309 }
 310
 311 /* Go to the next line */
 312 static void goto_new_line(void)
 313 {
 314         input_end();
 315         if (cmdedit_x)
 316                 bb_putchar('\n');
 317 }
 318
 319
 320 static void out1str(const char *s)
 321 {
 322         if (s)
 323                 fputs(s, stdout);
 324 }
 325
 326 static void beep(void)
 327 {
 328         bb_putchar('\007');
 329 }
 330
 331 /* Move back one character */
 332 /* (optimized for slow terminals) */
 333 static void input_backward(unsigned num)
 334 {
 335         int count_y;
 336
 337         if (num > cursor)
 338                 num = cursor;
 339         if (!num)
 340                 return;
 341         cursor -= num;
 342
 343         if (cmdedit_x >= num) {
 344                 cmdedit_x -= num;
 345                 if (num <= 4) {
 346                         /* This is longer by 5 bytes on x86.
 347                          * Also gets miscompiled for ARM users
 348                          * (busybox.net/bugs/view.php?id=2274).
 349                          * printf(("\b\b\b\b" + 4) - num);
 350                          * return;
 351                          */
 352                         do {
 353                                 bb_putchar('\b');
 354                         } while (--num);
 355                         return;
 356                 }
 357                 printf("\033[%uD", num);
 358                 return;
 359         }
 360
 361         /* Need to go one or more lines up */
 362         num -= cmdedit_x;
 363         {
 364                 unsigned w = cmdedit_termw; /* volatile var */
 365                 count_y = 1 + (num / w);
 366                 cmdedit_y -= count_y;
 367                 cmdedit_x = w * count_y - num;
 368         }
 369         /* go to 1st column; go up; go to correct column */
 370         printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
 371 }
 372
 373 static void put_prompt(void)
 374 {
 375         out1str(cmdedit_prompt);
 376         fflush(NULL);
 377 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 378         {
 379                 /* Ask terminal where is the cursor now.
 380                  * lineedit_read_key handles response and corrects
 381                  * our idea of current cursor position.
 382                  * Testcase: run "echo -n long_line_long_line_long_line",
 383                  * then type in a long, wrapping command and try to
 384                  * delete it using backspace key.
 385                  * Note: we print it _after_ prompt, because
 386                  * prompt may contain CR. Example: PS1='\[\r\n\]\w '
 387                  */
 388                 /* Problem: if there is buffered input on stdin,
 389                  * the response will be delivered later,
 390                  * possibly to an unsuspecting application.
 391                  * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
 392                  * Result:
 393                  * ~/srcdevel/bbox/fix/busybox.t4 #
 394                  * ~/srcdevel/bbox/fix/busybox.t4 #
 395                  * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
 396                  * ~/srcdevel/bbox/fix/busybox.t4 #
 397                  *
 398                  * Checking for input with poll only makes the race narrower,
 399                  * I still can trigger it. Strace:
 400                  *
 401                  * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
 402                  * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
 403                  * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
 404                  * poll([{fd=0, events=POLLIN}], 1, 4294967295) = 1 ([{fd=0, revents=POLLIN}])
 405                  * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
 406                  */
 407                 struct pollfd pfd;
 408
 409                 pfd.fd = STDIN_FILENO;
 410                 pfd.events = POLLIN;
 411                 if (safe_poll(&pfd, 1, 0) == 0) {
 412                         S.sent_ESC_br_n6 = 1;
 413                         out1str("\033" "[6n");
 414                         fflush(NULL); /* make terminal see it ASAP! */
 415                 }
 416         }
 417 #endif
 418         cursor = 0;
 419         {
 420                 unsigned w = cmdedit_termw; /* volatile var */
 421                 cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
 422                 cmdedit_x = cmdedit_prmt_len % w;
 423         }
 424 }
 425
 426 /* draw prompt, editor line, and clear tail */
 427 static void redraw(int y, int back_cursor)
 428 {
 429         if (y > 0)  /* up to start y */
 430                 printf("\033[%uA", y);
 431         bb_putchar('\r');
 432         put_prompt();
 433         input_end();      /* rewrite */
 434         printf("\033[J"); /* erase after cursor */
 435         input_backward(back_cursor);
 436 }
 437
 438 /* Delete the char in front of the cursor, optionally saving it
 439  * for later putback */
 440 #if !ENABLE_FEATURE_EDITING_VI
 441 static void input_delete(void)
 442 #define input_delete(save) input_delete()
 443 #else
 444 static void input_delete(int save)
 445 #endif
 446 {
 447         int j = cursor;
 448
 449         if (j == (int)command_len)
 450                 return;
 451
 452 #if ENABLE_FEATURE_EDITING_VI
 453         if (save) {
 454                 if (newdelflag) {
 455                         delptr = delbuf;
 456                         newdelflag = 0;
 457                 }
 458                 if ((delptr - delbuf) < DELBUFSIZ)
 459                         *delptr++ = command_ps[j];
 460         }
 461 #endif
 462
 463         memmove(command_ps + j, command_ps + j + 1,
 464                         /* (command_len + 1 [because of NUL]) - (j + 1)
 465                          * simplified into (command_len - j) */
 466                         (command_len - j) * sizeof(command_ps[0]));
 467         command_len--;
 468         input_end();                    /* rewrite new line */
 469         cmdedit_set_out_char(' ');      /* erase char */
 470         input_backward(cursor - j);     /* back to old pos cursor */
 471 }
 472
 473 #if ENABLE_FEATURE_EDITING_VI
 474 static void put(void)
 475 {
 476         int ocursor;
 477         int j = delptr - delbuf;
 478
 479         if (j == 0)
 480                 return;
 481         ocursor = cursor;
 482         /* open hole and then fill it */
 483         memmove(command_ps + cursor + j, command_ps + cursor,
 484                         (command_len - cursor + 1) * sizeof(command_ps[0]));
 485         memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
 486         command_len += j;
 487         input_end();                    /* rewrite new line */
 488         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 489 }
 490 #endif
 491
 492 /* Delete the char in back of the cursor */
 493 static void input_backspace(void)
 494 {
 495         if (cursor > 0) {
 496                 input_backward(1);
 497                 input_delete(0);
 498         }
 499 }
 500
 501 /* Move forward one character */
 502 static void input_forward(void)
 503 {
 504         if (cursor < command_len)
 505                 cmdedit_set_out_char(command_ps[cursor + 1]);
 506 }
 507
 508 #if ENABLE_FEATURE_TAB_COMPLETION
 509
 510 static void free_tab_completion_data(void)
 511 {
 512         if (matches) {
 513                 while (num_matches)
 514                         free(matches[--num_matches]);
 515                 free(matches);
 516                 matches = NULL;
 517         }
 518 }
 519
 520 static void add_match(char *matched)
 521 {
 522         matches = xrealloc_vector(matches, 4, num_matches);
 523         matches[num_matches] = matched;
 524         num_matches++;
 525 }
 526
 527 #if ENABLE_FEATURE_USERNAME_COMPLETION
 528 static void username_tab_completion(char *ud, char *with_shash_flg)
 529 {
 530         struct passwd *entry;
 531         int userlen;
 532
 533         ud++;                           /* ~user/... to user/... */
 534         userlen = strlen(ud);
 535
 536         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 537                 char *sav_ud = ud - 1;
 538                 char *home = NULL;
 539
 540                 if (*ud == '/') {       /* "~/..."     */
 541                         home = home_pwd_buf;
 542                 } else {
 543                         /* "~user/..." */
 544                         char *temp;
 545                         temp = strchr(ud, '/');
 546                         *temp = '\0';           /* ~user\0 */
 547                         entry = getpwnam(ud);
 548                         *temp = '/';            /* restore ~user/... */
 549                         ud = temp;
 550                         if (entry)
 551                                 home = entry->pw_dir;
 552                 }
 553                 if (home) {
 554                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 555                                 /* /home/user/... */
 556                                 sprintf(sav_ud, "%s%s", home, ud);
 557                         }
 558                 }
 559         } else {
 560                 /* "~[^/]*" */
 561                 /* Using _r function to avoid pulling in static buffers */
 562                 char line_buff[256];
 563                 struct passwd pwd;
 564                 struct passwd *result;
 565
 566                 setpwent();
 567                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 568                         /* Null usernames should result in all users as possible completions. */
 569                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 570                                 add_match(xasprintf("~%s/", pwd.pw_name));
 571                         }
 572                 }
 573                 endpwent();
 574         }
 575 }
 576 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 577
 578 enum {
 579         FIND_EXE_ONLY = 0,
 580         FIND_DIR_ONLY = 1,
 581         FIND_FILE_ONLY = 2,
 582 };
 583
 584 static int path_parse(char ***p, int flags)
 585 {
 586         int npth;
 587         const char *pth;
 588         char *tmp;
 589         char **res;
 590
 591         /* if not setenv PATH variable, to search cur dir "." */
 592         if (flags != FIND_EXE_ONLY)
 593                 return 1;
 594
 595         if (state->flags & WITH_PATH_LOOKUP)
 596                 pth = state->path_lookup;
 597         else
 598                 pth = getenv("PATH");
 599         /* PATH=<empty> or PATH=:<empty> */
 600         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 601                 return 1;
 602
 603         tmp = (char*)pth;
 604         npth = 1; /* path component count */
 605         while (1) {
 606                 tmp = strchr(tmp, ':');
 607                 if (!tmp)
 608                         break;
 609                 if (*++tmp == '\0')
 610                         break;  /* :<empty> */
 611                 npth++;
 612         }
 613
 614         res = xmalloc(npth * sizeof(char*));
 615         res[0] = tmp = xstrdup(pth);
 616         npth = 1;
 617         while (1) {
 618                 tmp = strchr(tmp, ':');
 619                 if (!tmp)
 620                         break;
 621                 *tmp++ = '\0'; /* ':' -> '\0' */
 622                 if (*tmp == '\0')
 623                         break; /* :<empty> */
 624                 res[npth++] = tmp;
 625         }
 626         *p = res;
 627         return npth;
 628 }
 629
 630 static void exe_n_cwd_tab_completion(char *command, int type)
 631 {
 632         DIR *dir;
 633         struct dirent *next;
 634         struct stat st;
 635         char *path1[1];
 636         char **paths = path1;
 637         int npaths;
 638         int i;
 639         char *found;
 640         char *pfind = strrchr(command, '/');
 641 /*      char dirbuf[MAX_LINELEN]; */
 642 #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
 643
 644         npaths = 1;
 645         path1[0] = (char*)".";
 646
 647         if (pfind == NULL) {
 648                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 649                 npaths = path_parse(&paths, type);
 650                 pfind = command;
 651         } else {
 652                 /* dirbuf = ".../.../.../" */
 653                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 654 #if ENABLE_FEATURE_USERNAME_COMPLETION
 655                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 656                         username_tab_completion(dirbuf, dirbuf);
 657 #endif
 658                 paths[0] = dirbuf;
 659                 /* point to 'l' in "..../last_component" */
 660                 pfind++;
 661         }
 662
 663         for (i = 0; i < npaths; i++) {
 664                 dir = opendir(paths[i]);
 665                 if (!dir)
 666                         continue; /* don't print an error */
 667
 668                 while ((next = readdir(dir)) != NULL) {
 669                         int len1;
 670                         const char *str_found = next->d_name;
 671
 672                         /* matched? */
 673                         if (strncmp(str_found, pfind, strlen(pfind)))
 674                                 continue;
 675                         /* not see .name without .match */
 676                         if (*str_found == '.' && *pfind == '\0') {
 677                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 678                                         continue;
 679                                 str_found = ""; /* only "/" */
 680                         }
 681                         found = concat_path_file(paths[i], str_found);
 682                         /* hmm, remove in progress? */
 683                         /* NB: stat() first so that we see is it a directory;
 684                          * but if that fails, use lstat() so that
 685                          * we still match dangling links */
 686                         if (stat(found, &st) && lstat(found, &st))
 687                                 goto cont;
 688                         /* find with dirs? */
 689                         if (paths[i] != dirbuf)
 690                                 strcpy(found, next->d_name); /* only name */
 691
 692                         len1 = strlen(found);
 693                         found = xrealloc(found, len1 + 2);
 694                         found[len1] = '\0';
 695                         found[len1+1] = '\0';
 696
 697                         if (S_ISDIR(st.st_mode)) {
 698                                 /* name is a directory */
 699                                 if (found[len1-1] != '/') {
 700                                         found[len1] = '/';
 701                                 }
 702                         } else {
 703                                 /* not put found file if search only dirs for cd */
 704                                 if (type == FIND_DIR_ONLY)
 705                                         goto cont;
 706                         }
 707                         /* Add it to the list */
 708                         add_match(found);
 709                         continue;
 710  cont:
 711                         free(found);
 712                 }
 713                 closedir(dir);
 714         }
 715         if (paths != path1) {
 716                 free(paths[0]); /* allocated memory is only in first member */
 717                 free(paths);
 718         }
 719 #undef dirbuf
 720 }
 721
 722 /* QUOT is used on elements of int_buf[], which are bytes,
 723  * not Unicode chars. Therefore it works correctly even in Unicode mode.
 724  */
 725 #define QUOT (UCHAR_MAX+1)
 726
 727 #define int_buf (S.find_match__int_buf)
 728 #define pos_buf (S.find_match__pos_buf)
 729 /* is must be <= in */
 730 static void collapse_pos(int is, int in)
 731 {
 732         memmove(int_buf+is, int_buf+in, (MAX_LINELEN+1-in)*sizeof(int_buf[0]));
 733         memmove(pos_buf+is, pos_buf+in, (MAX_LINELEN+1-in)*sizeof(pos_buf[0]));
 734 }
 735 static NOINLINE int find_match(char *matchBuf, int *len_with_quotes)
 736 {
 737         int i, j;
 738         int command_mode;
 739         int c, c2;
 740 /*      Were local, but it uses too much stack */
 741 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 742 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 743
 744         /* set to integer dimension characters and own positions */
 745         for (i = 0;; i++) {
 746                 int_buf[i] = (unsigned char)matchBuf[i];
 747                 if (int_buf[i] == 0) {
 748                         pos_buf[i] = -1; /* end-fo-line indicator */
 749                         break;
 750                 }
 751                 pos_buf[i] = i;
 752         }
 753
 754         /* mask \+symbol and convert '\t' to ' ' */
 755         for (i = j = 0; matchBuf[i]; i++, j++)
 756                 if (matchBuf[i] == '\\') {
 757                         collapse_pos(j, j + 1);
 758                         int_buf[j] |= QUOT;
 759                         i++;
 760 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 761                         if (matchBuf[i] == '\t')  /* algorithm equivalent */
 762                                 int_buf[j] = ' ' | QUOT;
 763 #endif
 764                 }
 765 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 766                 else if (matchBuf[i] == '\t')
 767                         int_buf[j] = ' ';
 768 #endif
 769
 770         /* mask "symbols" or 'symbols' */
 771         c2 = 0;
 772         for (i = 0; int_buf[i]; i++) {
 773                 c = int_buf[i];
 774                 if (c == '\'' || c == '"') {
 775                         if (c2 == 0)
 776                                 c2 = c;
 777                         else {
 778                                 if (c == c2)
 779                                         c2 = 0;
 780                                 else
 781                                         int_buf[i] |= QUOT;
 782                         }
 783                 } else if (c2 != 0 && c != '$')
 784                         int_buf[i] |= QUOT;
 785         }
 786
 787         /* skip commands with arguments if line has commands delimiters */
 788         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 789         for (i = 0; int_buf[i]; i++) {
 790                 c = int_buf[i];
 791                 c2 = int_buf[i + 1];
 792                 j = i ? int_buf[i - 1] : -1;
 793                 command_mode = 0;
 794                 if (c == ';' || c == '&' || c == '|') {
 795                         command_mode = 1 + (c == c2);
 796                         if (c == '&') {
 797                                 if (j == '>' || j == '<')
 798                                         command_mode = 0;
 799                         } else if (c == '|' && j == '>')
 800                                 command_mode = 0;
 801                 }
 802                 if (command_mode) {
 803                         collapse_pos(0, i + command_mode);
 804                         i = -1;  /* hack incremet */
 805                 }
 806         }
 807         /* collapse `command...` */
 808         for (i = 0; int_buf[i]; i++) {
 809                 if (int_buf[i] == '`') {
 810                         for (j = i + 1; int_buf[j]; j++)
 811                                 if (int_buf[j] == '`') {
 812                                         collapse_pos(i, j + 1);
 813                                         j = 0;
 814                                         break;
 815                                 }
 816                         if (j) {
 817                                 /* not found closing ` - command mode, collapse all previous */
 818                                 collapse_pos(0, i + 1);
 819                                 break;
 820                         } else
 821                                 i--;  /* hack incremet */
 822                 }
 823         }
 824
 825         /* collapse (command...(command...)...) or {command...{command...}...} */
 826         c = 0;  /* "recursive" level */
 827         c2 = 0;
 828         for (i = 0; int_buf[i]; i++) {
 829                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 830                         if (int_buf[i] == '(')
 831                                 c++;
 832                         else
 833                                 c2++;
 834                         collapse_pos(0, i + 1);
 835                         i = -1;  /* hack incremet */
 836                 }
 837         }
 838         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++) {
 839                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 840                         if (int_buf[i] == ')')
 841                                 c--;
 842                         else
 843                                 c2--;
 844                         collapse_pos(0, i + 1);
 845                         i = -1;  /* hack incremet */
 846                 }
 847         }
 848
 849         /* skip first not quote space */
 850         for (i = 0; int_buf[i]; i++)
 851                 if (int_buf[i] != ' ')
 852                         break;
 853         if (i)
 854                 collapse_pos(0, i);
 855
 856         /* set find mode for completion */
 857         command_mode = FIND_EXE_ONLY;
 858         for (i = 0; int_buf[i]; i++) {
 859                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 860                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 861                          && matchBuf[pos_buf[0]] == 'c'
 862                          && matchBuf[pos_buf[1]] == 'd'
 863                         ) {
 864                                 command_mode = FIND_DIR_ONLY;
 865                         } else {
 866                                 command_mode = FIND_FILE_ONLY;
 867                                 break;
 868                         }
 869                 }
 870         }
 871         for (i = 0; int_buf[i]; i++)
 872                 /* "strlen" */;
 873         /* find last word */
 874         for (--i; i >= 0; i--) {
 875                 c = int_buf[i];
 876                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 877                         collapse_pos(0, i + 1);
 878                         break;
 879                 }
 880         }
 881         /* skip first not quoted '\'' or '"' */
 882         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 883                 /*skip*/;
 884         /* collapse quote or unquote // or /~ */
 885         while ((int_buf[i] & ~QUOT) == '/'
 886          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 887         ) {
 888                 i++;
 889         }
 890
 891         /* set only match and destroy quotes */
 892         j = 0;
 893         for (c = 0; pos_buf[i] >= 0; i++) {
 894                 matchBuf[c++] = matchBuf[pos_buf[i]];
 895                 j = pos_buf[i] + 1;
 896         }
 897         matchBuf[c] = '\0';
 898         /* old length matchBuf with quotes symbols */
 899         *len_with_quotes = j ? j - pos_buf[0] : 0;
 900
 901         return command_mode;
 902 }
 903 #undef int_buf
 904 #undef pos_buf
 905
 906 /*
 907  * display by column (original idea from ls applet,
 908  * very optimized by me :)
 909  */
 910 static void showfiles(void)
 911 {
 912         int ncols, row;
 913         int column_width = 0;
 914         int nfiles = num_matches;
 915         int nrows = nfiles;
 916         int l;
 917
 918         /* find the longest file name - use that as the column width */
 919         for (row = 0; row < nrows; row++) {
 920                 l = bb_mbstrlen(matches[row]);
 921                 if (column_width < l)
 922                         column_width = l;
 923         }
 924         column_width += 2;              /* min space for columns */
 925         ncols = cmdedit_termw / column_width;
 926
 927         if (ncols > 1) {
 928                 nrows /= ncols;
 929                 if (nfiles % ncols)
 930                         nrows++;        /* round up fractionals */
 931         } else {
 932                 ncols = 1;
 933         }
 934         for (row = 0; row < nrows; row++) {
 935                 int n = row;
 936                 int nc;
 937
 938                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
 939                         printf("%s%-*s", matches[n],
 940                                 (int)(column_width - bb_mbstrlen(matches[n])), ""
 941                         );
 942                 }
 943                 puts(matches[n]);
 944         }
 945 }
 946
 947 static char *add_quote_for_spec_chars(char *found)
 948 {
 949         int l = 0;
 950         char *s = xzalloc((strlen(found) + 1) * 2);
 951
 952         while (*found) {
 953                 if (strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", *found))
 954                         s[l++] = '\\';
 955                 s[l++] = *found++;
 956         }
 957         /* s[l] = '\0'; - already is */
 958         return s;
 959 }
 960
 961 /* Do TAB completion */
 962 static void input_tab(smallint *lastWasTab)
 963 {
 964         if (!(state->flags & TAB_COMPLETION))
 965                 return;
 966
 967         if (!*lastWasTab) {
 968                 char *tmp, *tmp1;
 969                 size_t len_found;
 970 /*              char matchBuf[MAX_LINELEN]; */
 971 #define matchBuf (S.input_tab__matchBuf)
 972                 int find_type;
 973                 int recalc_pos;
 974 #if ENABLE_FEATURE_ASSUME_UNICODE
 975                 /* cursor pos in command converted to multibyte form */
 976                 int cursor_mb;
 977 #endif
 978
 979                 *lastWasTab = TRUE;             /* flop trigger */
 980
 981                 /* Make a local copy of the string --
 982                  * up to the position of the cursor */
 983                 save_string(matchBuf, cursor + 1);
 984 #if ENABLE_FEATURE_ASSUME_UNICODE
 985                 cursor_mb = strlen(matchBuf);
 986 #endif
 987                 tmp = matchBuf;
 988
 989                 find_type = find_match(matchBuf, &recalc_pos);
 990
 991                 /* Free up any memory already allocated */
 992                 free_tab_completion_data();
 993
 994 #if ENABLE_FEATURE_USERNAME_COMPLETION
 995                 /* If the word starts with `~' and there is no slash in the word,
 996                  * then try completing this word as a username. */
 997                 if (state->flags & USERNAME_COMPLETION)
 998                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == NULL)
 999                                 username_tab_completion(matchBuf, NULL);
1000 #endif
1001                 /* Try to match any executable in our path and everything
1002                  * in the current working directory */
1003                 if (!matches)
1004                         exe_n_cwd_tab_completion(matchBuf, find_type);
1005                 /* Sort, then remove any duplicates found */
1006                 if (matches) {
1007                         unsigned i;
1008                         int n = 0;
1009                         qsort_string_vector(matches, num_matches);
1010                         for (i = 0; i < num_matches - 1; ++i) {
1011                                 if (matches[i] && matches[i+1]) { /* paranoia */
1012                                         if (strcmp(matches[i], matches[i+1]) == 0) {
1013                                                 free(matches[i]);
1014                                                 matches[i] = NULL; /* paranoia */
1015                                         } else {
1016                                                 matches[n++] = matches[i];
1017                                         }
1018                                 }
1019                         }
1020                         matches[n] = matches[i];
1021                         num_matches = n + 1;
1022                 }
1023                 /* Did we find exactly one match? */
1024                 if (!matches || num_matches > 1) { /* no */
1025                         beep();
1026                         if (!matches)
1027                                 return;         /* not found */
1028                         /* find minimal match */
1029                         tmp1 = xstrdup(matches[0]);
1030                         for (tmp = tmp1; *tmp; tmp++) {
1031                                 for (len_found = 1; len_found < num_matches; len_found++) {
1032                                         if (matches[len_found][tmp - tmp1] != *tmp) {
1033                                                 *tmp = '\0';
1034                                                 break;
1035                                         }
1036                                 }
1037                         }
1038                         if (*tmp1 == '\0') {        /* have unique */
1039                                 free(tmp1);
1040                                 return;
1041                         }
1042                         tmp = add_quote_for_spec_chars(tmp1);
1043                         free(tmp1);
1044                 } else {                        /* one match */
1045                         tmp = add_quote_for_spec_chars(matches[0]);
1046                         /* for next completion current found */
1047                         *lastWasTab = FALSE;
1048
1049                         len_found = strlen(tmp);
1050                         if (tmp[len_found-1] != '/') {
1051                                 tmp[len_found] = ' ';
1052                                 tmp[len_found+1] = '\0';
1053                         }
1054                 }
1055
1056                 len_found = strlen(tmp);
1057 #if !ENABLE_FEATURE_ASSUME_UNICODE
1058                 /* have space to place the match? */
1059                 /* The result consists of three parts with these lengths: */
1060                 /* (cursor - recalc_pos) + len_found + (command_len - cursor) */
1061                 /* it simplifies into: */
1062                 if ((int)(len_found + command_len - recalc_pos) < S.maxsize) {
1063                         /* save tail */
1064                         strcpy(matchBuf, command_ps + cursor);
1065                         /* add match and tail */
1066                         sprintf(&command_ps[cursor - recalc_pos], "%s%s", tmp, matchBuf);
1067                         command_len = strlen(command_ps);
1068                         /* new pos */
1069                         recalc_pos = cursor - recalc_pos + len_found;
1070                         /* write out the matched command */
1071                         redraw(cmdedit_y, command_len - recalc_pos);
1072                 }
1073 #else
1074                 {
1075                         char command[MAX_LINELEN];
1076                         int len = save_string(command, sizeof(command));
1077                         /* have space to place the match? */
1078                         /* (cursor_mb - recalc_pos) + len_found + (len - cursor_mb) */
1079                         if ((int)(len_found + len - recalc_pos) < MAX_LINELEN) {
1080                                 /* save tail */
1081                                 strcpy(matchBuf, command + cursor_mb);
1082                                 /* where do we want to have cursor after all? */
1083                                 strcpy(&command[cursor_mb - recalc_pos], tmp);
1084                                 len = load_string(command, S.maxsize);
1085                                 /* add match and tail */
1086                                 sprintf(&command[cursor_mb - recalc_pos], "%s%s", tmp, matchBuf);
1087                                 command_len = load_string(command, S.maxsize);
1088                                 /* write out the matched command */
1089                                 redraw(cmdedit_y, command_len - len);
1090                         }
1091                 }
1092 #endif
1093                 free(tmp);
1094 #undef matchBuf
1095         } else {
1096                 /* Ok -- the last char was a TAB.  Since they
1097                  * just hit TAB again, print a list of all the
1098                  * available choices... */
1099                 if (matches && num_matches > 0) {
1100                         /* changed by goto_new_line() */
1101                         int sav_cursor = cursor;
1102
1103                         /* Go to the next line */
1104                         goto_new_line();
1105                         showfiles();
1106                         redraw(0, command_len - sav_cursor);
1107                 }
1108         }
1109 }
1110
1111 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
1112
1113
1114 line_input_t* FAST_FUNC new_line_input_t(int flags)
1115 {
1116         line_input_t *n = xzalloc(sizeof(*n));
1117         n->flags = flags;
1118         return n;
1119 }
1120
1121
1122 #if MAX_HISTORY > 0
1123
1124 static void save_command_ps_at_cur_history(void)
1125 {
1126         if (command_ps[0] != BB_NUL) {
1127                 int cur = state->cur_history;
1128                 free(state->history[cur]);
1129
1130 # if ENABLE_FEATURE_ASSUME_UNICODE
1131                 {
1132                         char tbuf[MAX_LINELEN];
1133                         save_string(tbuf, sizeof(tbuf));
1134                         state->history[cur] = xstrdup(tbuf);
1135                 }
1136 # else
1137                 state->history[cur] = xstrdup(command_ps);
1138 # endif
1139         }
1140 }
1141
1142 /* state->flags is already checked to be nonzero */
1143 static int get_previous_history(void)
1144 {
1145         if ((state->flags & DO_HISTORY) && state->cur_history) {
1146                 save_command_ps_at_cur_history();
1147                 state->cur_history--;
1148                 return 1;
1149         }
1150         beep();
1151         return 0;
1152 }
1153
1154 static int get_next_history(void)
1155 {
1156         if (state->flags & DO_HISTORY) {
1157                 if (state->cur_history < state->cnt_history) {
1158                         save_command_ps_at_cur_history(); /* save the current history line */
1159                         return ++state->cur_history;
1160                 }
1161         }
1162         beep();
1163         return 0;
1164 }
1165
1166 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1167 /* We try to ensure that concurrent additions to the history
1168  * do not overwrite each other.
1169  * Otherwise shell users get unhappy.
1170  *
1171  * History file is trimmed lazily, when it grows several times longer
1172  * than configured MAX_HISTORY lines.
1173  */
1174
1175 static void free_line_input_t(line_input_t *n)
1176 {
1177         int i = n->cnt_history;
1178         while (i > 0)
1179                 free(n->history[--i]);
1180         free(n);
1181 }
1182
1183 /* state->flags is already checked to be nonzero */
1184 static void load_history(line_input_t *st_parm)
1185 {
1186         char *temp_h[MAX_HISTORY];
1187         char *line;
1188         FILE *fp;
1189         unsigned idx, i, line_len;
1190
1191         /* NB: do not trash old history if file can't be opened */
1192
1193         fp = fopen_for_read(st_parm->hist_file);
1194         if (fp) {
1195                 /* clean up old history */
1196                 for (idx = st_parm->cnt_history; idx > 0;) {
1197                         idx--;
1198                         free(st_parm->history[idx]);
1199                         st_parm->history[idx] = NULL;
1200                 }
1201
1202                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1203                 memset(temp_h, 0, sizeof(temp_h));
1204                 st_parm->cnt_history_in_file = idx = 0;
1205                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1206                         if (line[0] == '\0') {
1207                                 free(line);
1208                                 continue;
1209                         }
1210                         free(temp_h[idx]);
1211                         temp_h[idx] = line;
1212                         st_parm->cnt_history_in_file++;
1213                         idx++;
1214                         if (idx == MAX_HISTORY)
1215                                 idx = 0;
1216                 }
1217                 fclose(fp);
1218
1219                 /* find first non-NULL temp_h[], if any */
1220                 if (st_parm->cnt_history_in_file) {
1221                         while (temp_h[idx] == NULL) {
1222                                 idx++;
1223                                 if (idx == MAX_HISTORY)
1224                                         idx = 0;
1225                         }
1226                 }
1227
1228                 /* copy temp_h[] to st_parm->history[] */
1229                 for (i = 0; i < MAX_HISTORY;) {
1230                         line = temp_h[idx];
1231                         if (!line)
1232                                 break;
1233                         idx++;
1234                         if (idx == MAX_HISTORY)
1235                                 idx = 0;
1236                         line_len = strlen(line);
1237                         if (line_len >= MAX_LINELEN)
1238                                 line[MAX_LINELEN-1] = '\0';
1239                         st_parm->history[i++] = line;
1240                 }
1241                 st_parm->cnt_history = i;
1242         }
1243 }
1244
1245 /* state->flags is already checked to be nonzero */
1246 static void save_history(char *str)
1247 {
1248         int fd;
1249         int len, len2;
1250
1251         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0666);
1252         if (fd < 0)
1253                 return;
1254         xlseek(fd, 0, SEEK_END); /* paranoia */
1255         len = strlen(str);
1256         str[len] = '\n'; /* we (try to) do atomic write */
1257         len2 = full_write(fd, str, len + 1);
1258         str[len] = '\0';
1259         close(fd);
1260         if (len2 != len + 1)
1261                 return; /* "wtf?" */
1262
1263         /* did we write so much that history file needs trimming? */
1264         state->cnt_history_in_file++;
1265         if (state->cnt_history_in_file > MAX_HISTORY * 4) {
1266                 FILE *fp;
1267                 char *new_name;
1268                 line_input_t *st_temp;
1269                 int i;
1270
1271                 /* we may have concurrently written entries from others.
1272                  * load them */
1273                 st_temp = new_line_input_t(state->flags);
1274                 st_temp->hist_file = state->hist_file;
1275                 load_history(st_temp);
1276
1277                 /* write out temp file and replace hist_file atomically */
1278                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1279                 fp = fopen_for_write(new_name);
1280                 if (fp) {
1281                         for (i = 0; i < st_temp->cnt_history; i++)
1282                                 fprintf(fp, "%s\n", st_temp->history[i]);
1283                         fclose(fp);
1284                         if (rename(new_name, state->hist_file) == 0)
1285                                 state->cnt_history_in_file = st_temp->cnt_history;
1286                 }
1287                 free(new_name);
1288                 free_line_input_t(st_temp);
1289         }
1290 }
1291 # else
1292 #  define load_history(a) ((void)0)
1293 #  define save_history(a) ((void)0)
1294 # endif /* FEATURE_COMMAND_SAVEHISTORY */
1295
1296 static void remember_in_history(char *str)
1297 {
1298         int i;
1299
1300         if (!(state->flags & DO_HISTORY))
1301                 return;
1302         if (str[0] == '\0')
1303                 return;
1304         i = state->cnt_history;
1305         /* Don't save dupes */
1306         if (i && strcmp(state->history[i-1], str) == 0)
1307                 return;
1308
1309         free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1310         state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1311
1312         /* If history[] is full, remove the oldest command */
1313         /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1314         if (i >= MAX_HISTORY) {
1315                 free(state->history[0]);
1316                 for (i = 0; i < MAX_HISTORY-1; i++)
1317                         state->history[i] = state->history[i+1];
1318                 /* i == MAX_HISTORY-1 */
1319         }
1320         /* i <= MAX_HISTORY-1 */
1321         state->history[i++] = xstrdup(str);
1322         /* i <= MAX_HISTORY */
1323         state->cur_history = i;
1324         state->cnt_history = i;
1325 # if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
1326         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1327                 save_history(str);
1328 # endif
1329         IF_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1330 }
1331
1332 #else /* MAX_HISTORY == 0 */
1333 # define remember_in_history(a) ((void)0)
1334 #endif /* MAX_HISTORY */
1335
1336
1337 #if ENABLE_FEATURE_EDITING_VI
1338 /*
1339  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1340  */
1341 static void
1342 vi_Word_motion(int eat)
1343 {
1344         CHAR_T *command = command_ps;
1345
1346         while (cursor < command_len && !BB_isspace(command[cursor]))
1347                 input_forward();
1348         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1349                 input_forward();
1350 }
1351
1352 static void
1353 vi_word_motion(int eat)
1354 {
1355         CHAR_T *command = command_ps;
1356
1357         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1358                 while (cursor < command_len
1359                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1360                 ) {
1361                         input_forward();
1362                 }
1363         } else if (BB_ispunct(command[cursor])) {
1364                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1365                         input_forward();
1366         }
1367
1368         if (cursor < command_len)
1369                 input_forward();
1370
1371         if (eat) {
1372                 while (cursor < command_len && BB_isspace(command[cursor]))
1373                         input_forward();
1374         }
1375 }
1376
1377 static void
1378 vi_End_motion(void)
1379 {
1380         CHAR_T *command = command_ps;
1381
1382         input_forward();
1383         while (cursor < command_len && BB_isspace(command[cursor]))
1384                 input_forward();
1385         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1386                 input_forward();
1387 }
1388
1389 static void
1390 vi_end_motion(void)
1391 {
1392         CHAR_T *command = command_ps;
1393
1394         if (cursor >= command_len-1)
1395                 return;
1396         input_forward();
1397         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1398                 input_forward();
1399         if (cursor >= command_len-1)
1400                 return;
1401         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1402                 while (cursor < command_len-1
1403                  && (BB_isalnum(command[cursor+1]) || command[cursor+1] == '_')
1404                 ) {
1405                         input_forward();
1406                 }
1407         } else if (BB_ispunct(command[cursor])) {
1408                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1409                         input_forward();
1410         }
1411 }
1412
1413 static void
1414 vi_Back_motion(void)
1415 {
1416         CHAR_T *command = command_ps;
1417
1418         while (cursor > 0 && BB_isspace(command[cursor-1]))
1419                 input_backward(1);
1420         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1421                 input_backward(1);
1422 }
1423
1424 static void
1425 vi_back_motion(void)
1426 {
1427         CHAR_T *command = command_ps;
1428
1429         if (cursor <= 0)
1430                 return;
1431         input_backward(1);
1432         while (cursor > 0 && BB_isspace(command[cursor]))
1433                 input_backward(1);
1434         if (cursor <= 0)
1435                 return;
1436         if (BB_isalnum(command[cursor]) || command[cursor] == '_') {
1437                 while (cursor > 0
1438                  && (BB_isalnum(command[cursor-1]) || command[cursor-1] == '_')
1439                 ) {
1440                         input_backward(1);
1441                 }
1442         } else if (BB_ispunct(command[cursor])) {
1443                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1444                         input_backward(1);
1445         }
1446 }
1447 #endif
1448
1449 /* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1450 static void ctrl_left(void)
1451 {
1452         CHAR_T *command = command_ps;
1453
1454         while (1) {
1455                 CHAR_T c;
1456
1457                 input_backward(1);
1458                 if (cursor == 0)
1459                         break;
1460                 c = command[cursor];
1461                 if (c != ' ' && !BB_ispunct(c)) {
1462                         /* we reached a "word" delimited by spaces/punct.
1463                          * go to its beginning */
1464                         while (1) {
1465                                 c = command[cursor - 1];
1466                                 if (c == ' ' || BB_ispunct(c))
1467                                         break;
1468                                 input_backward(1);
1469                                 if (cursor == 0)
1470                                         break;
1471                         }
1472                         break;
1473                 }
1474         }
1475 }
1476 static void ctrl_right(void)
1477 {
1478         CHAR_T *command = command_ps;
1479
1480         while (1) {
1481                 CHAR_T c;
1482
1483                 c = command[cursor];
1484                 if (c == BB_NUL)
1485                         break;
1486                 if (c != ' ' && !BB_ispunct(c)) {
1487                         /* we reached a "word" delimited by spaces/punct.
1488                          * go to its end + 1 */
1489                         while (1) {
1490                                 input_forward();
1491                                 c = command[cursor];
1492                                 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1493                                         break;
1494                         }
1495                         break;
1496                 }
1497                 input_forward();
1498         }
1499 }
1500
1501
1502 /*
1503  * read_line_input and its helpers
1504  */
1505
1506 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1507 static void parse_and_put_prompt(const char *prmt_ptr)
1508 {
1509         cmdedit_prompt = prmt_ptr;
1510         cmdedit_prmt_len = strlen(prmt_ptr);
1511         put_prompt();
1512 }
1513 #else
1514 static void parse_and_put_prompt(const char *prmt_ptr)
1515 {
1516         int prmt_len = 0;
1517         size_t cur_prmt_len = 0;
1518         char flg_not_length = '[';
1519         char *prmt_mem_ptr = xzalloc(1);
1520         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1521         char cbuf[2];
1522         char c;
1523         char *pbuf;
1524
1525         cmdedit_prmt_len = 0;
1526
1527         if (!cwd_buf) {
1528                 cwd_buf = (char *)bb_msg_unknown;
1529         }
1530
1531         cbuf[1] = '\0'; /* never changes */
1532
1533         while (*prmt_ptr) {
1534                 char *free_me = NULL;
1535
1536                 pbuf = cbuf;
1537                 c = *prmt_ptr++;
1538                 if (c == '\\') {
1539                         const char *cp = prmt_ptr;
1540                         int l;
1541
1542                         c = bb_process_escape_sequence(&prmt_ptr);
1543                         if (prmt_ptr == cp) {
1544                                 if (*cp == '\0')
1545                                         break;
1546                                 c = *prmt_ptr++;
1547
1548                                 switch (c) {
1549 # if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1550                                 case 'u':
1551                                         pbuf = user_buf ? user_buf : (char*)"";
1552                                         break;
1553 # endif
1554                                 case 'h':
1555                                         pbuf = free_me = safe_gethostname();
1556                                         *strchrnul(pbuf, '.') = '\0';
1557                                         break;
1558                                 case '$':
1559                                         c = (geteuid() == 0 ? '#' : '$');
1560                                         break;
1561 # if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1562                                 case 'w':
1563                                         /* /home/user[/something] -> ~[/something] */
1564                                         pbuf = cwd_buf;
1565                                         l = strlen(home_pwd_buf);
1566                                         if (l != 0
1567                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1568                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1569                                          && strlen(cwd_buf + l) < PATH_MAX
1570                                         ) {
1571                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1572                                         }
1573                                         break;
1574 # endif
1575                                 case 'W':
1576                                         pbuf = cwd_buf;
1577                                         cp = strrchr(pbuf, '/');
1578                                         if (cp != NULL && cp != pbuf)
1579                                                 pbuf += (cp-pbuf) + 1;
1580                                         break;
1581                                 case '!':
1582                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1583                                         break;
1584                                 case 'e': case 'E':     /* \e \E = \033 */
1585                                         c = '\033';
1586                                         break;
1587                                 case 'x': case 'X': {
1588                                         char buf2[4];
1589                                         for (l = 0; l < 3;) {
1590                                                 unsigned h;
1591                                                 buf2[l++] = *prmt_ptr;
1592                                                 buf2[l] = '\0';
1593                                                 h = strtoul(buf2, &pbuf, 16);
1594                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1595                                                         buf2[--l] = '\0';
1596                                                         break;
1597                                                 }
1598                                                 prmt_ptr++;
1599                                         }
1600                                         c = (char)strtoul(buf2, NULL, 16);
1601                                         if (c == 0)
1602                                                 c = '?';
1603                                         pbuf = cbuf;
1604                                         break;
1605                                 }
1606                                 case '[': case ']':
1607                                         if (c == flg_not_length) {
1608                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1609                                                 continue;
1610                                         }
1611                                         break;
1612                                 } /* switch */
1613                         } /* if */
1614                 } /* if */
1615                 cbuf[0] = c;
1616                 cur_prmt_len = strlen(pbuf);
1617                 prmt_len += cur_prmt_len;
1618                 if (flg_not_length != ']')
1619                         cmdedit_prmt_len += cur_prmt_len;
1620                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1621                 free(free_me);
1622         } /* while */
1623
1624         if (cwd_buf != (char *)bb_msg_unknown)
1625                 free(cwd_buf);
1626         cmdedit_prompt = prmt_mem_ptr;
1627         put_prompt();
1628 }
1629 #endif
1630
1631 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1632 {
1633         cmdedit_termw = w;
1634         if (redraw_flg) {
1635                 /* new y for current cursor */
1636                 int new_y = (cursor + cmdedit_prmt_len) / w;
1637                 /* redraw */
1638                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1639                 fflush(NULL);
1640         }
1641 }
1642
1643 static void win_changed(int nsig)
1644 {
1645         unsigned width;
1646         get_terminal_width_height(0, &width, NULL);
1647         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1648         if (nsig == SIGWINCH)
1649                 signal(SIGWINCH, win_changed); /* rearm ourself */
1650 }
1651
1652 static int lineedit_read_key(char *read_key_buffer)
1653 {
1654         int64_t ic;
1655         struct pollfd pfd;
1656         int delay = -1;
1657 #if ENABLE_FEATURE_ASSUME_UNICODE
1658         char unicode_buf[MB_CUR_MAX + 1];
1659         int unicode_idx = 0;
1660 #endif
1661
1662         pfd.fd = STDIN_FILENO;
1663         pfd.events = POLLIN;
1664         do {
1665  poll_again:
1666                 if (read_key_buffer[0] == 0) {
1667                         /* Wait for input. Can't just call read_key,
1668                          * it returns at once if stdin
1669                          * is in non-blocking mode. */
1670                         safe_poll(&pfd, 1, delay);
1671                 }
1672                 /* Note: read_key sets errno to 0 on success: */
1673                 ic = read_key(STDIN_FILENO, read_key_buffer);
1674
1675 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1676                 if ((int32_t)ic == KEYCODE_CURSOR_POS
1677                  && S.sent_ESC_br_n6
1678                 ) {
1679                         S.sent_ESC_br_n6 = 0;
1680                         if (cursor == 0) { /* otherwise it may be bogus */
1681                                 int col = ((ic >> 32) & 0x7fff) - 1;
1682                                 if (col > cmdedit_prmt_len) {
1683                                         cmdedit_x += (col - cmdedit_prmt_len);
1684                                         while (cmdedit_x >= cmdedit_termw) {
1685                                                 cmdedit_x -= cmdedit_termw;
1686                                                 cmdedit_y++;
1687                                         }
1688                                 }
1689                         }
1690                         goto poll_again;
1691                 }
1692 #endif
1693
1694 #if ENABLE_FEATURE_ASSUME_UNICODE
1695                 {
1696                         wchar_t wc;
1697
1698                         if ((int32_t)ic < 0) /* KEYCODE_xxx */
1699                                 return ic;
1700                         unicode_buf[unicode_idx++] = ic;
1701                         unicode_buf[unicode_idx] = '\0';
1702                         if (mbstowcs(&wc, unicode_buf, 1) != 1 && unicode_idx < MB_CUR_MAX) {
1703                                 delay = 50;
1704                                 goto poll_again;
1705                         }
1706                         ic = wc;
1707                 }
1708 #endif
1709         } while (errno == EAGAIN);
1710
1711         return ic;
1712 }
1713
1714 /* leave out the "vi-mode"-only case labels if vi editing isn't
1715  * configured. */
1716 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
1717
1718 /* convert uppercase ascii to equivalent control char, for readability */
1719 #undef CTRL
1720 #define CTRL(a) ((a) & ~0x40)
1721
1722 /* maxsize must be >= 2.
1723  * Returns:
1724  * -1 on read errors or EOF, or on bare Ctrl-D,
1725  * 0  on ctrl-C (the line entered is still returned in 'command'),
1726  * >0 length of input string, including terminating '\n'
1727  */
1728 int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1729 {
1730         int len;
1731 #if ENABLE_FEATURE_TAB_COMPLETION
1732         smallint lastWasTab = FALSE;
1733 #endif
1734         smallint break_out = 0;
1735 #if ENABLE_FEATURE_EDITING_VI
1736         smallint vi_cmdmode = 0;
1737 #endif
1738         struct termios initial_settings;
1739         struct termios new_settings;
1740         char read_key_buffer[KEYCODE_BUFFER_SIZE];
1741
1742         INIT_S();
1743
1744         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1745          || !(initial_settings.c_lflag & ECHO)
1746         ) {
1747                 /* Happens when e.g. stty -echo was run before */
1748                 parse_and_put_prompt(prompt);
1749                 /* fflush(stdout); - done by parse_and_put_prompt */
1750                 if (fgets(command, maxsize, stdin) == NULL)
1751                         len = -1; /* EOF or error */
1752                 else
1753                         len = strlen(command);
1754                 DEINIT_S();
1755                 return len;
1756         }
1757
1758         check_unicode_in_env();
1759
1760 // FIXME: audit & improve this
1761         if (maxsize > MAX_LINELEN)
1762                 maxsize = MAX_LINELEN;
1763         S.maxsize = maxsize;
1764
1765         /* With null flags, no other fields are ever used */
1766         state = st ? st : (line_input_t*) &const_int_0;
1767 #if MAX_HISTORY > 0
1768 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1769         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1770                 if (state->cnt_history == 0)
1771                         load_history(state);
1772 # endif
1773         if (state->flags & DO_HISTORY)
1774                 state->cur_history = state->cnt_history;
1775 #endif
1776
1777         /* prepare before init handlers */
1778         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1779         command_len = 0;
1780 #if ENABLE_FEATURE_ASSUME_UNICODE
1781         command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
1782 #else
1783         command_ps = command;
1784         command[0] = '\0';
1785 #endif
1786 #define command command_must_not_be_used
1787
1788         new_settings = initial_settings;
1789         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1790         /* Turn off echoing and CTRL-C, so we can trap it */
1791         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1792         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1793         new_settings.c_cc[VMIN] = 1;
1794         new_settings.c_cc[VTIME] = 0;
1795         /* Turn off CTRL-C, so we can trap it */
1796 #ifndef _POSIX_VDISABLE
1797 # define _POSIX_VDISABLE '\0'
1798 #endif
1799         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1800         tcsetattr_stdin_TCSANOW(&new_settings);
1801
1802         /* Now initialize things */
1803         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1804         win_changed(0); /* do initial resizing */
1805 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1806         {
1807                 struct passwd *entry;
1808
1809                 entry = getpwuid(geteuid());
1810                 if (entry) {
1811                         user_buf = xstrdup(entry->pw_name);
1812                         home_pwd_buf = xstrdup(entry->pw_dir);
1813                 }
1814         }
1815 #endif
1816
1817 #if 0
1818         for (i = 0; i <= MAX_HISTORY; i++)
1819                 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
1820         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
1821 #endif
1822
1823         /* Print out the command prompt */
1824         parse_and_put_prompt(prompt);
1825
1826         read_key_buffer[0] = 0;
1827         while (1) {
1828                 /*
1829                  * The emacs and vi modes share much of the code in the big
1830                  * command loop.  Commands entered when in vi's command mode
1831                  * (aka "escape mode") get an extra bit added to distinguish
1832                  * them - this keeps them from being self-inserted. This
1833                  * clutters the big switch a bit, but keeps all the code
1834                  * in one place.
1835                  */
1836                 enum {
1837                         VI_CMDMODE_BIT = 0x40000000,
1838                         /* 0x80000000 bit flags KEYCODE_xxx */
1839                 };
1840                 int32_t ic, ic_raw;
1841
1842                 fflush(NULL);
1843                 ic = ic_raw = lineedit_read_key(read_key_buffer);
1844
1845 #if ENABLE_FEATURE_EDITING_VI
1846                 newdelflag = 1;
1847                 if (vi_cmdmode) {
1848                         /* btw, since KEYCODE_xxx are all < 0, this doesn't
1849                          * change ic if it contains one of them: */
1850                         ic |= VI_CMDMODE_BIT;
1851                 }
1852 #endif
1853
1854                 switch (ic) {
1855                 case '\n':
1856                 case '\r':
1857                 vi_case('\n'|VI_CMDMODE_BIT:)
1858                 vi_case('\r'|VI_CMDMODE_BIT:)
1859                         /* Enter */
1860                         goto_new_line();
1861                         break_out = 1;
1862                         break;
1863                 case CTRL('A'):
1864                 vi_case('0'|VI_CMDMODE_BIT:)
1865                         /* Control-a -- Beginning of line */
1866                         input_backward(cursor);
1867                         break;
1868                 case CTRL('B'):
1869                 vi_case('h'|VI_CMDMODE_BIT:)
1870                 vi_case('\b'|VI_CMDMODE_BIT:)
1871                 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
1872                         /* Control-b -- Move back one character */
1873                         input_backward(1);
1874                         break;
1875                 case CTRL('E'):
1876                 vi_case('$'|VI_CMDMODE_BIT:)
1877                         /* Control-e -- End of line */
1878                         input_end();
1879                         break;
1880                 case CTRL('F'):
1881                 vi_case('l'|VI_CMDMODE_BIT:)
1882                 vi_case(' '|VI_CMDMODE_BIT:)
1883                         /* Control-f -- Move forward one character */
1884                         input_forward();
1885                         break;
1886                 case '\b':
1887                 case '\x7f': /* DEL */
1888                         /* Control-h and DEL */
1889                         input_backspace();
1890                         break;
1891 #if ENABLE_FEATURE_TAB_COMPLETION
1892                 case '\t':
1893                         input_tab(&lastWasTab);
1894                         break;
1895 #endif
1896                 case CTRL('K'):
1897                         /* Control-k -- clear to end of line */
1898                         command_ps[cursor] = BB_NUL;
1899                         command_len = cursor;
1900                         printf("\033[J");
1901                         break;
1902                 case CTRL('L'):
1903                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
1904                         /* Control-l -- clear screen */
1905                         printf("\033[H");
1906                         redraw(0, command_len - cursor);
1907                         break;
1908 #if MAX_HISTORY > 0
1909                 case CTRL('N'):
1910                 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
1911                 vi_case('j'|VI_CMDMODE_BIT:)
1912                         /* Control-n -- Get next command in history */
1913                         if (get_next_history())
1914                                 goto rewrite_line;
1915                         break;
1916                 case CTRL('P'):
1917                 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
1918                 vi_case('k'|VI_CMDMODE_BIT:)
1919                         /* Control-p -- Get previous command from history */
1920                         if (get_previous_history())
1921                                 goto rewrite_line;
1922                         break;
1923 #endif
1924                 case CTRL('U'):
1925                 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
1926                         /* Control-U -- Clear line before cursor */
1927                         if (cursor) {
1928                                 command_len -= cursor;
1929                                 memmove(command_ps, command_ps + cursor,
1930                                         (command_len + 1) * sizeof(command_ps[0]));
1931                                 redraw(cmdedit_y, command_len);
1932                         }
1933                         break;
1934                 case CTRL('W'):
1935                 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
1936                         /* Control-W -- Remove the last word */
1937                         while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
1938                                 input_backspace();
1939                         while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
1940                                 input_backspace();
1941                         break;
1942
1943 #if ENABLE_FEATURE_EDITING_VI
1944                 case 'i'|VI_CMDMODE_BIT:
1945                         vi_cmdmode = 0;
1946                         break;
1947                 case 'I'|VI_CMDMODE_BIT:
1948                         input_backward(cursor);
1949                         vi_cmdmode = 0;
1950                         break;
1951                 case 'a'|VI_CMDMODE_BIT:
1952                         input_forward();
1953                         vi_cmdmode = 0;
1954                         break;
1955                 case 'A'|VI_CMDMODE_BIT:
1956                         input_end();
1957                         vi_cmdmode = 0;
1958                         break;
1959                 case 'x'|VI_CMDMODE_BIT:
1960                         input_delete(1);
1961                         break;
1962                 case 'X'|VI_CMDMODE_BIT:
1963                         if (cursor > 0) {
1964                                 input_backward(1);
1965                                 input_delete(1);
1966                         }
1967                         break;
1968                 case 'W'|VI_CMDMODE_BIT:
1969                         vi_Word_motion(1);
1970                         break;
1971                 case 'w'|VI_CMDMODE_BIT:
1972                         vi_word_motion(1);
1973                         break;
1974                 case 'E'|VI_CMDMODE_BIT:
1975                         vi_End_motion();
1976                         break;
1977                 case 'e'|VI_CMDMODE_BIT:
1978                         vi_end_motion();
1979                         break;
1980                 case 'B'|VI_CMDMODE_BIT:
1981                         vi_Back_motion();
1982                         break;
1983                 case 'b'|VI_CMDMODE_BIT:
1984                         vi_back_motion();
1985                         break;
1986                 case 'C'|VI_CMDMODE_BIT:
1987                         vi_cmdmode = 0;
1988                         /* fall through */
1989                 case 'D'|VI_CMDMODE_BIT:
1990                         goto clear_to_eol;
1991
1992                 case 'c'|VI_CMDMODE_BIT:
1993                         vi_cmdmode = 0;
1994                         /* fall through */
1995                 case 'd'|VI_CMDMODE_BIT: {
1996                         int nc, sc;
1997
1998                         ic = lineedit_read_key(read_key_buffer);
1999                         if (errno) /* error */
2000                                 goto prepare_to_die;
2001                         if (ic == ic_raw) { /* "cc", "dd" */
2002                                 input_backward(cursor);
2003                                 goto clear_to_eol;
2004                                 break;
2005                         }
2006
2007                         sc = cursor;
2008                         switch (ic) {
2009                         case 'w':
2010                         case 'W':
2011                         case 'e':
2012                         case 'E':
2013                                 switch (ic) {
2014                                 case 'w':   /* "dw", "cw" */
2015                                         vi_word_motion(vi_cmdmode);
2016                                         break;
2017                                 case 'W':   /* 'dW', 'cW' */
2018                                         vi_Word_motion(vi_cmdmode);
2019                                         break;
2020                                 case 'e':   /* 'de', 'ce' */
2021                                         vi_end_motion();
2022                                         input_forward();
2023                                         break;
2024                                 case 'E':   /* 'dE', 'cE' */
2025                                         vi_End_motion();
2026                                         input_forward();
2027                                         break;
2028                                 }
2029                                 nc = cursor;
2030                                 input_backward(cursor - sc);
2031                                 while (nc-- > cursor)
2032                                         input_delete(1);
2033                                 break;
2034                         case 'b':  /* "db", "cb" */
2035                         case 'B':  /* implemented as B */
2036                                 if (ic == 'b')
2037                                         vi_back_motion();
2038                                 else
2039                                         vi_Back_motion();
2040                                 while (sc-- > cursor)
2041                                         input_delete(1);
2042                                 break;
2043                         case ' ':  /* "d ", "c " */
2044                                 input_delete(1);
2045                                 break;
2046                         case '$':  /* "d$", "c$" */
2047  clear_to_eol:
2048                                 while (cursor < command_len)
2049                                         input_delete(1);
2050                                 break;
2051                         }
2052                         break;
2053                 }
2054                 case 'p'|VI_CMDMODE_BIT:
2055                         input_forward();
2056                         /* fallthrough */
2057                 case 'P'|VI_CMDMODE_BIT:
2058                         put();
2059                         break;
2060                 case 'r'|VI_CMDMODE_BIT:
2061 //FIXME: unicode case?
2062                         ic = lineedit_read_key(read_key_buffer);
2063                         if (errno) /* error */
2064                                 goto prepare_to_die;
2065                         if (ic < ' ' || ic > 255) {
2066                                 beep();
2067                         } else {
2068                                 command_ps[cursor] = ic;
2069                                 bb_putchar(ic);
2070                                 bb_putchar('\b');
2071                         }
2072                         break;
2073                 case '\x1b': /* ESC */
2074                         if (state->flags & VI_MODE) {
2075                                 /* insert mode --> command mode */
2076                                 vi_cmdmode = 1;
2077                                 input_backward(1);
2078                         }
2079                         break;
2080 #endif /* FEATURE_COMMAND_EDITING_VI */
2081
2082 #if MAX_HISTORY > 0
2083                 case KEYCODE_UP:
2084                         if (get_previous_history())
2085                                 goto rewrite_line;
2086                         beep();
2087                         break;
2088                 case KEYCODE_DOWN:
2089                         if (!get_next_history())
2090                                 break;
2091  rewrite_line:
2092                         /* Rewrite the line with the selected history item */
2093                         /* change command */
2094                         command_len = load_string(state->history[state->cur_history] ?
2095                                         state->history[state->cur_history] : "", maxsize);
2096                         /* redraw and go to eol (bol, in vi) */
2097                         redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2098                         break;
2099 #endif
2100                 case KEYCODE_RIGHT:
2101                         input_forward();
2102                         break;
2103                 case KEYCODE_LEFT:
2104                         input_backward(1);
2105                         break;
2106                 case KEYCODE_CTRL_LEFT:
2107                         ctrl_left();
2108                         break;
2109                 case KEYCODE_CTRL_RIGHT:
2110                         ctrl_right();
2111                         break;
2112                 case KEYCODE_DELETE:
2113                         input_delete(0);
2114                         break;
2115                 case KEYCODE_HOME:
2116                         input_backward(cursor);
2117                         break;
2118                 case KEYCODE_END:
2119                         input_end();
2120                         break;
2121
2122                 default:
2123                         if (initial_settings.c_cc[VINTR] != 0
2124                          && ic_raw == initial_settings.c_cc[VINTR]
2125                         ) {
2126                                 /* Ctrl-C (usually) - stop gathering input */
2127                                 goto_new_line();
2128                                 command_len = 0;
2129                                 break_out = -1; /* "do not append '\n'" */
2130                                 break;
2131                         }
2132                         if (initial_settings.c_cc[VEOF] != 0
2133                          && ic_raw == initial_settings.c_cc[VEOF]
2134                         ) {
2135                                 /* Ctrl-D (usually) - delete one character,
2136                                  * or exit if len=0 and no chars to delete */
2137                                 if (command_len == 0) {
2138                                         errno = 0;
2139 #if ENABLE_FEATURE_EDITING_VI
2140  prepare_to_die:
2141 #endif
2142                                         break_out = command_len = -1;
2143                                         break;
2144                                 }
2145                                 input_delete(0);
2146                                 break;
2147                         }
2148 //                      /* Control-V -- force insert of next char */
2149 //                      if (c == CTRL('V')) {
2150 //                              if (safe_read(STDIN_FILENO, &c, 1) < 1)
2151 //                                      goto prepare_to_die;
2152 //                              if (c == 0) {
2153 //                                      beep();
2154 //                                      break;
2155 //                              }
2156 //                      }
2157                         if (ic < ' '
2158                          || (!ENABLE_FEATURE_ASSUME_UNICODE && ic >= 256)
2159                          || (ENABLE_FEATURE_ASSUME_UNICODE && ic >= VI_CMDMODE_BIT)
2160                         ) {
2161                                 /* If VI_CMDMODE_BIT is set, ic is >= 256
2162                                  * and vi mode ignores unexpected chars.
2163                                  * Otherwise, we are here if ic is a
2164                                  * control char or an unhandled ESC sequence,
2165                                  * which is also ignored.
2166                                  */
2167                                 break;
2168                         }
2169                         if ((int)command_len >= (maxsize - 2)) {
2170                                 /* Not enough space for the char and EOL */
2171                                 break;
2172                         }
2173
2174                         command_len++;
2175                         if (cursor == (command_len - 1)) {
2176                                 /* We are at the end, append */
2177                                 command_ps[cursor] = ic;
2178                                 command_ps[cursor + 1] = BB_NUL;
2179                                 cmdedit_set_out_char(' ');
2180                         } else {
2181                                 /* In the middle, insert */
2182                                 int sc = cursor;
2183
2184                                 memmove(command_ps + sc + 1, command_ps + sc,
2185                                         (command_len - sc) * sizeof(command_ps[0]));
2186                                 command_ps[sc] = ic;
2187                                 sc++;
2188                                 /* rewrite from cursor */
2189                                 input_end();
2190                                 /* to prev x pos + 1 */
2191                                 input_backward(cursor - sc);
2192                         }
2193                         break;
2194                 } /* switch (ic) */
2195
2196                 if (break_out)
2197                         break;
2198
2199 #if ENABLE_FEATURE_TAB_COMPLETION
2200                 if (ic_raw != '\t')
2201                         lastWasTab = FALSE;
2202 #endif
2203         } /* while (1) */
2204
2205 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2206         if (S.sent_ESC_br_n6) {
2207                 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2208                  * We sent "ESC [ 6 n", but got '\n' first, and
2209                  * KEYCODE_CURSOR_POS response is now buffered from terminal.
2210                  * It's bad already and not much can be done with it
2211                  * (it _will_ be visible for the next process to read stdin),
2212                  * but without this delay it even shows up on the screen
2213                  * as garbage because we restore echo settings with tcsetattr
2214                  * before it comes in. UGLY!
2215                  */
2216                 usleep(20*1000);
2217         }
2218 #endif
2219
2220 /* Stop bug catching using "command_must_not_be_used" trick */
2221 #undef command
2222
2223 #if ENABLE_FEATURE_ASSUME_UNICODE
2224         command[0] = '\0';
2225         if (command_len > 0)
2226                 command_len = save_string(command, maxsize - 1);
2227         free(command_ps);
2228 #endif
2229
2230         if (command_len > 0)
2231                 remember_in_history(command);
2232
2233         if (break_out > 0) {
2234                 command[command_len++] = '\n';
2235                 command[command_len] = '\0';
2236         }
2237
2238 #if ENABLE_FEATURE_TAB_COMPLETION
2239         free_tab_completion_data();
2240 #endif
2241
2242         /* restore initial_settings */
2243         tcsetattr_stdin_TCSANOW(&initial_settings);
2244         /* restore SIGWINCH handler */
2245         signal(SIGWINCH, previous_SIGWINCH_handler);
2246         fflush(NULL);
2247
2248         len = command_len;
2249         DEINIT_S();
2250
2251         return len; /* can't return command_len, DEINIT_S() destroys it */
2252 }
2253
2254 #else
2255
2256 #undef read_line_input
2257 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2258 {
2259         fputs(prompt, stdout);
2260         fflush(NULL);
2261         fgets(command, maxsize, stdin);
2262         return strlen(command);
2263 }
2264
2265 #endif  /* FEATURE_EDITING */
2266
2267
2268 /*
2269  * Testing
2270  */
2271
2272 #ifdef TEST
2273
2274 #include <locale.h>
2275
2276 const char *applet_name = "debug stuff usage";
2277
2278 int main(int argc, char **argv)
2279 {
2280         char buff[MAX_LINELEN];
2281         char *prompt =
2282 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2283                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2284                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2285                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
2286 #else
2287                 "% ";
2288 #endif
2289
2290 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
2291         setlocale(LC_ALL, "");
2292 #endif
2293         while (1) {
2294                 int l;
2295                 l = read_line_input(prompt, buff);
2296                 if (l <= 0 || buff[l-1] != '\n')
2297                         break;
2298                 buff[l-1] = 0;
2299                 printf("*** read_line_input() returned line =%s=\n", buff);
2300         }
2301         printf("*** read_line_input() detect ^D\n");
2302         return 0;
2303 }
2304
2305 #endif  /* TEST */