libbb/lineedit.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Command line 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  * Usage and known bugs:
  18  * Terminal key codes are not extensive, more needs to be added.
  19  * This version was created on Debian GNU/Linux 2.x.
  20  * Delete, Backspace, Home, End, and the arrow keys were tested
  21  * to work in an Xterm and console. Ctrl-A also works as Home.
  22  * Ctrl-E also works as End.
  23  *
  24  * The following readline-like commands are not implemented:
  25  * CTL-t -- Transpose two characters
  26  *
  27  * lineedit does not know that the terminal escape sequences do not
  28  * take up space on the screen. The redisplay code assumes, unless
  29  * told otherwise, that each character in the prompt is a printable
  30  * character that takes up one character position on the screen.
  31  * You need to tell lineedit that some sequences of characters
  32  * in the prompt take up no screen space. Compatibly with readline,
  33  * use the \[ escape to begin a sequence of non-printing characters,
  34  * and the \] escape to signal the end of such a sequence. Example:
  35  *
  36  * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
  37  *
  38  * Unicode in PS1 is not fully supported: prompt length calulation is wrong,
  39  * resulting in line wrap problems with long (multi-line) input.
  40  */
  41 #include "busybox.h"
  42 #include "NUM_APPLETS.h"
  43 #include "unicode.h"
  44 #ifndef _POSIX_VDISABLE
  45 # define _POSIX_VDISABLE '\0'
  46 #endif
  47
  48
  49 #ifdef TEST
  50 # define ENABLE_FEATURE_EDITING 0
  51 # define ENABLE_FEATURE_TAB_COMPLETION 0
  52 # define ENABLE_FEATURE_USERNAME_COMPLETION 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_USERNAME_OR_HOMEDIR \
  61         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  62 #define IF_USERNAME_OR_HOMEDIR(...)
  63 #if ENABLE_USERNAME_OR_HOMEDIR
  64 # undef IF_USERNAME_OR_HOMEDIR
  65 # define IF_USERNAME_OR_HOMEDIR(...) __VA_ARGS__
  66 #endif
  67
  68
  69 #undef CHAR_T
  70 #if ENABLE_UNICODE_SUPPORT
  71 # define BB_NUL ((wchar_t)0)
  72 # define CHAR_T wchar_t
  73 static bool BB_isspace(CHAR_T c) { return ((unsigned)c < 256 && isspace(c)); }
  74 # if ENABLE_FEATURE_EDITING_VI
  75 static bool BB_isalnum_or_underscore(CHAR_T c) {
  76         return ((unsigned)c < 256 && isalnum(c)) || c == '_';
  77 }
  78 # endif
  79 static bool BB_ispunct(CHAR_T c) { return ((unsigned)c < 256 && ispunct(c)); }
  80 # undef isspace
  81 # undef isalnum
  82 # undef ispunct
  83 # undef isprint
  84 # define isspace isspace_must_not_be_used
  85 # define isalnum isalnum_must_not_be_used
  86 # define ispunct ispunct_must_not_be_used
  87 # define isprint isprint_must_not_be_used
  88 #else
  89 # define BB_NUL '\0'
  90 # define CHAR_T char
  91 # define BB_isspace(c) isspace(c)
  92 # if ENABLE_FEATURE_EDITING_VI
  93 static bool BB_isalnum_or_underscore(CHAR_T c)
  94 {
  95         return ((unsigned)c < 256 && isalnum(c)) || c == '_';
  96 }
  97 # endif
  98 # define BB_ispunct(c) ispunct(c)
  99 #endif
 100 #if ENABLE_UNICODE_PRESERVE_BROKEN
 101 # define unicode_mark_raw_byte(wc)   ((wc) | 0x20000000)
 102 # define unicode_is_raw_byte(wc)     ((wc) & 0x20000000)
 103 #else
 104 # define unicode_is_raw_byte(wc)     0
 105 #endif
 106
 107
 108 #define ESC "\033"
 109
 110 #define SEQ_CLEAR_TILL_END_OF_SCREEN  ESC"[J"
 111 //#define SEQ_CLEAR_TILL_END_OF_LINE  ESC"[K"
 112
 113
 114 enum {
 115         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
 116                       ? CONFIG_FEATURE_EDITING_MAX_LEN
 117                       : 0x7ff0
 118 };
 119
 120 #if ENABLE_USERNAME_OR_HOMEDIR
 121 static const char null_str[] ALIGN1 = "";
 122 #endif
 123
 124 /* We try to minimize both static and stack usage. */
 125 struct lineedit_statics {
 126         line_input_t *state;
 127
 128         unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
 129
 130         unsigned cmdedit_x;        /* real x (col) terminal position */
 131         unsigned cmdedit_y;        /* pseudoreal y (row) terminal position */
 132         unsigned cmdedit_prmt_len; /* on-screen length of last/sole prompt line */
 133
 134         unsigned cursor;
 135         int command_len; /* must be signed */
 136         /* signed maxsize: we want x in "if (x > S.maxsize)"
 137          * to _not_ be promoted to unsigned */
 138         int maxsize;
 139         CHAR_T *command_ps;
 140
 141         const char *cmdedit_prompt;
 142         const char *prompt_last_line;  /* last/sole prompt line */
 143
 144 #if ENABLE_USERNAME_OR_HOMEDIR
 145         char *user_buf;
 146         char *home_pwd_buf; /* = (char*)null_str; */
 147 #endif
 148
 149 #if ENABLE_FEATURE_TAB_COMPLETION
 150         char **matches;
 151         unsigned num_matches;
 152 #endif
 153
 154 #if ENABLE_FEATURE_EDITING_WINCH
 155         unsigned SIGWINCH_saved;
 156         volatile unsigned SIGWINCH_count;
 157         volatile smallint ok_to_redraw;
 158 #endif
 159
 160 #if ENABLE_FEATURE_EDITING_VI
 161 # define DELBUFSIZ 128
 162         smallint newdelflag;     /* whether delbuf should be reused yet */
 163         CHAR_T *delptr;
 164         CHAR_T delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 165 #endif
 166 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
 167         smallint sent_ESC_br6n;
 168 #endif
 169
 170 #if ENABLE_FEATURE_EDITING_WINCH
 171         /* Largish struct, keeping it last results in smaller code */
 172         struct sigaction SIGWINCH_handler;
 173 #endif
 174 };
 175
 176 /* See lineedit_ptr_hack.c */
 177 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 178
 179 #define S (*lineedit_ptr_to_statics)
 180 #define state            (S.state           )
 181 #define cmdedit_termw    (S.cmdedit_termw   )
 182 #define cmdedit_x        (S.cmdedit_x       )
 183 #define cmdedit_y        (S.cmdedit_y       )
 184 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 185 #define cursor           (S.cursor          )
 186 #define command_len      (S.command_len     )
 187 #define command_ps       (S.command_ps      )
 188 #define cmdedit_prompt   (S.cmdedit_prompt  )
 189 #define prompt_last_line (S.prompt_last_line)
 190 #define user_buf         (S.user_buf        )
 191 #define home_pwd_buf     (S.home_pwd_buf    )
 192 #define matches          (S.matches         )
 193 #define num_matches      (S.num_matches     )
 194 #define delptr           (S.delptr          )
 195 #define newdelflag       (S.newdelflag      )
 196 #define delbuf           (S.delbuf          )
 197
 198 #define INIT_S() do { \
 199         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 200         barrier(); \
 201         cmdedit_termw = 80; \
 202         IF_USERNAME_OR_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 203         IF_FEATURE_EDITING_VI(delptr = delbuf;) \
 204 } while (0)
 205
 206 static void deinit_S(void)
 207 {
 208 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 209         /* This one is allocated only if FANCY_PROMPT is on
 210          * (otherwise it points to verbatim prompt (NOT malloced)) */
 211         free((char*)cmdedit_prompt);
 212 #endif
 213 #if ENABLE_USERNAME_OR_HOMEDIR
 214         free(user_buf);
 215         if (home_pwd_buf != null_str)
 216                 free(home_pwd_buf);
 217 #endif
 218         free(lineedit_ptr_to_statics);
 219 }
 220 #define DEINIT_S() deinit_S()
 221
 222
 223 #if ENABLE_UNICODE_SUPPORT
 224 static size_t load_string(const char *src)
 225 {
 226         if (unicode_status == UNICODE_ON) {
 227                 ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1);
 228                 if (len < 0)
 229                         len = 0;
 230                 command_ps[len] = BB_NUL;
 231                 return len;
 232         } else {
 233                 unsigned i = 0;
 234                 while (src[i] && i < S.maxsize - 1) {
 235                         command_ps[i] = src[i];
 236                         i++;
 237                 }
 238                 command_ps[i] = BB_NUL;
 239                 return i;
 240         }
 241 }
 242 static unsigned save_string(char *dst, unsigned maxsize)
 243 {
 244         if (unicode_status == UNICODE_ON) {
 245 # if !ENABLE_UNICODE_PRESERVE_BROKEN
 246                 ssize_t len = wcstombs(dst, command_ps, maxsize - 1);
 247                 if (len < 0)
 248                         len = 0;
 249                 dst[len] = '\0';
 250                 return len;
 251 # else
 252                 unsigned dstpos = 0;
 253                 unsigned srcpos = 0;
 254
 255                 maxsize--;
 256                 while (dstpos < maxsize) {
 257                         wchar_t wc;
 258                         int n = srcpos;
 259
 260                         /* Convert up to 1st invalid byte (or up to end) */
 261                         while ((wc = command_ps[srcpos]) != BB_NUL
 262                             && !unicode_is_raw_byte(wc)
 263                         ) {
 264                                 srcpos++;
 265                         }
 266                         command_ps[srcpos] = BB_NUL;
 267                         n = wcstombs(dst + dstpos, command_ps + n, maxsize - dstpos);
 268                         if (n < 0) /* should not happen */
 269                                 break;
 270                         dstpos += n;
 271                         if (wc == BB_NUL) /* usually is */
 272                                 break;
 273
 274                         /* We do have invalid byte here! */
 275                         command_ps[srcpos] = wc; /* restore it */
 276                         srcpos++;
 277                         if (dstpos == maxsize)
 278                                 break;
 279                         dst[dstpos++] = (char) wc;
 280                 }
 281                 dst[dstpos] = '\0';
 282                 return dstpos;
 283 # endif
 284         } else {
 285                 unsigned i = 0;
 286                 while ((dst[i] = command_ps[i]) != 0)
 287                         i++;
 288                 return i;
 289         }
 290 }
 291 /* I thought just fputwc(c, stdout) would work. But no... */
 292 static void BB_PUTCHAR(wchar_t c)
 293 {
 294         if (unicode_status == UNICODE_ON) {
 295                 char buf[MB_CUR_MAX + 1];
 296                 mbstate_t mbst = { 0 };
 297                 ssize_t len = wcrtomb(buf, c, &mbst);
 298                 if (len > 0) {
 299                         buf[len] = '\0';
 300                         fputs(buf, stdout);
 301                 }
 302         } else {
 303                 /* In this case, c is always one byte */
 304                 putchar(c);
 305         }
 306 }
 307 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
 308 static wchar_t adjust_width_and_validate_wc(unsigned *width_adj, wchar_t wc)
 309 # else
 310 static wchar_t adjust_width_and_validate_wc(wchar_t wc)
 311 #  define adjust_width_and_validate_wc(width_adj, wc) \
 312         ((*(width_adj))++, adjust_width_and_validate_wc(wc))
 313 # endif
 314 {
 315         int w = 1;
 316
 317         if (unicode_status == UNICODE_ON) {
 318                 if (wc > CONFIG_LAST_SUPPORTED_WCHAR) {
 319                         /* note: also true for unicode_is_raw_byte(wc) */
 320                         goto subst;
 321                 }
 322                 w = wcwidth(wc);
 323                 if ((ENABLE_UNICODE_COMBINING_WCHARS && w < 0)
 324                  || (!ENABLE_UNICODE_COMBINING_WCHARS && w <= 0)
 325                  || (!ENABLE_UNICODE_WIDE_WCHARS && w > 1)
 326                 ) {
 327  subst:
 328                         w = 1;
 329                         wc = CONFIG_SUBST_WCHAR;
 330                 }
 331         }
 332
 333 # if ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS
 334         *width_adj += w;
 335 #endif
 336         return wc;
 337 }
 338 #else /* !UNICODE */
 339 static size_t load_string(const char *src)
 340 {
 341         safe_strncpy(command_ps, src, S.maxsize);
 342         return strlen(command_ps);
 343 }
 344 # if ENABLE_FEATURE_TAB_COMPLETION
 345 static void save_string(char *dst, unsigned maxsize)
 346 {
 347         safe_strncpy(dst, command_ps, maxsize);
 348 }
 349 # endif
 350 # define BB_PUTCHAR(c) bb_putchar(c)
 351 /* Should never be called: */
 352 int adjust_width_and_validate_wc(unsigned *width_adj, int wc);
 353 #endif
 354
 355
 356 /* Put 'command_ps[cursor]', cursor++.
 357  * Advance cursor on screen. If we reached right margin, scroll text up
 358  * and remove terminal margin effect by printing 'next_char' */
 359 #define HACK_FOR_WRONG_WIDTH 1
 360 static void put_cur_glyph_and_inc_cursor(void)
 361 {
 362         CHAR_T c = command_ps[cursor];
 363         unsigned width = 0;
 364         int ofs_to_right;
 365
 366         if (c == BB_NUL) {
 367                 /* erase character after end of input string */
 368                 c = ' ';
 369         } else {
 370                 /* advance cursor only if we aren't at the end yet */
 371                 cursor++;
 372                 if (unicode_status == UNICODE_ON) {
 373                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x;)
 374                         c = adjust_width_and_validate_wc(&cmdedit_x, c);
 375                         IF_UNICODE_WIDE_WCHARS(width = cmdedit_x - width;)
 376                 } else {
 377                         cmdedit_x++;
 378                 }
 379         }
 380
 381         ofs_to_right = cmdedit_x - cmdedit_termw;
 382         if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right <= 0) {
 383                 /* c fits on this line */
 384                 BB_PUTCHAR(c);
 385         }
 386
 387         if (ofs_to_right >= 0) {
 388                 /* we go to the next line */
 389 #if HACK_FOR_WRONG_WIDTH
 390                 /* This works better if our idea of term width is wrong
 391                  * and it is actually wider (often happens on serial lines).
 392                  * Printing CR,LF *forces* cursor to next line.
 393                  * OTOH if terminal width is correct AND terminal does NOT
 394                  * have automargin (IOW: it is moving cursor to next line
 395                  * by itself (which is wrong for VT-10x terminals)),
 396                  * this will break things: there will be one extra empty line */
 397                 puts("\r"); /* + implicit '\n' */
 398 #else
 399                 /* VT-10x terminals don't wrap cursor to next line when last char
 400                  * on the line is printed - cursor stays "over" this char.
 401                  * Need to print _next_ char too (first one to appear on next line)
 402                  * to make cursor move down to next line.
 403                  */
 404                 /* Works ok only if cmdedit_termw is correct. */
 405                 c = command_ps[cursor];
 406                 if (c == BB_NUL)
 407                         c = ' ';
 408                 BB_PUTCHAR(c);
 409                 bb_putchar('\b');
 410 #endif
 411                 cmdedit_y++;
 412                 if (!ENABLE_UNICODE_WIDE_WCHARS || ofs_to_right == 0) {
 413                         width = 0;
 414                 } else { /* ofs_to_right > 0 */
 415                         /* wide char c didn't fit on prev line */
 416                         BB_PUTCHAR(c);
 417                 }
 418                 cmdedit_x = width;
 419         }
 420 }
 421
 422 /* Move to end of line (by printing all chars till the end) */
 423 static void put_till_end_and_adv_cursor(void)
 424 {
 425         while (cursor < command_len)
 426                 put_cur_glyph_and_inc_cursor();
 427 }
 428
 429 /* Go to the next line */
 430 static void goto_new_line(void)
 431 {
 432         put_till_end_and_adv_cursor();
 433         /* "cursor == 0" is only if prompt is "" and user input is empty */
 434         if (cursor == 0 || cmdedit_x != 0)
 435                 bb_putchar('\n');
 436 }
 437
 438 static void beep(void)
 439 {
 440         bb_putchar('\007');
 441 }
 442
 443 /* Full or last/sole prompt line, reset edit cursor, calculate terminal cursor.
 444  * cmdedit_y is always calculated for the last/sole prompt line.
 445  */
 446 static void put_prompt_custom(bool is_full)
 447 {
 448         fputs((is_full ? cmdedit_prompt : prompt_last_line), stdout);
 449         cursor = 0;
 450         cmdedit_y = cmdedit_prmt_len / cmdedit_termw; /* new quasireal y */
 451         cmdedit_x = cmdedit_prmt_len % cmdedit_termw;
 452 }
 453
 454 #define put_prompt_last_line() put_prompt_custom(0)
 455 #define put_prompt()           put_prompt_custom(1)
 456
 457 /* Move back one character */
 458 /* (optimized for slow terminals) */
 459 static void input_backward(unsigned num)
 460 {
 461         if (num > cursor)
 462                 num = cursor;
 463         if (num == 0)
 464                 return;
 465         cursor -= num;
 466
 467         if ((ENABLE_UNICODE_COMBINING_WCHARS || ENABLE_UNICODE_WIDE_WCHARS)
 468          && unicode_status == UNICODE_ON
 469         ) {
 470                 /* correct NUM to be equal to _screen_ width */
 471                 int n = num;
 472                 num = 0;
 473                 while (--n >= 0)
 474                         adjust_width_and_validate_wc(&num, command_ps[cursor + n]);
 475                 if (num == 0)
 476                         return;
 477         }
 478
 479         if (cmdedit_x >= num) {
 480                 cmdedit_x -= num;
 481                 if (num <= 4) {
 482                         /* This is longer by 5 bytes on x86.
 483                          * Also gets miscompiled for ARM users
 484                          * (busybox.net/bugs/view.php?id=2274).
 485                          * printf(("\b\b\b\b" + 4) - num);
 486                          * return;
 487                          */
 488                         do {
 489                                 bb_putchar('\b');
 490                         } while (--num);
 491                         return;
 492                 }
 493                 printf(ESC"[%uD", num);
 494                 return;
 495         }
 496
 497         /* Need to go one or more lines up */
 498         if (ENABLE_UNICODE_WIDE_WCHARS) {
 499                 /* With wide chars, it is hard to "backtrack"
 500                  * and reliably figure out where to put cursor.
 501                  * Example (<> is a wide char; # is an ordinary char, _ cursor):
 502                  * |prompt: <><> |
 503                  * |<><><><><><> |
 504                  * |_            |
 505                  * and user presses left arrow. num = 1, cmdedit_x = 0,
 506                  * We need to go up one line, and then - how do we know that
 507                  * we need to go *10* positions to the right? Because
 508                  * |prompt: <>#<>|
 509                  * |<><><>#<><><>|
 510                  * |_            |
 511                  * in this situation we need to go *11* positions to the right.
 512                  *
 513                  * A simpler thing to do is to redraw everything from the start
 514                  * up to new cursor position (which is already known):
 515                  */
 516                 unsigned sv_cursor;
 517                 /* go to 1st column; go up to first line */
 518                 printf("\r" ESC"[%uA", cmdedit_y);
 519                 cmdedit_y = 0;
 520                 sv_cursor = cursor;
 521                 put_prompt_last_line(); /* sets cursor to 0 */
 522                 while (cursor < sv_cursor)
 523                         put_cur_glyph_and_inc_cursor();
 524         } else {
 525                 int lines_up;
 526                 /* num = chars to go back from the beginning of current line: */
 527                 num -= cmdedit_x;
 528                 /* num=1...w: one line up, w+1...2w: two, etc: */
 529                 lines_up = 1 + (num - 1) / cmdedit_termw;
 530                 cmdedit_x = (cmdedit_termw * cmdedit_y - num) % cmdedit_termw;
 531                 cmdedit_y -= lines_up;
 532                 /* go to 1st column; go up */
 533                 printf("\r" ESC"[%uA", lines_up);
 534                 /* go to correct column.
 535                  * xterm, konsole, Linux VT interpret 0 as 1 below! wow.
 536                  * need to *make sure* we skip it if cmdedit_x == 0 */
 537                 if (cmdedit_x)
 538                         printf(ESC"[%uC", cmdedit_x);
 539         }
 540 }
 541
 542 /* See redraw and draw_full below */
 543 static void draw_custom(int y, int back_cursor, bool is_full)
 544 {
 545         if (y > 0) /* up y lines */
 546                 printf(ESC"[%uA", y);
 547         bb_putchar('\r');
 548         put_prompt_custom(is_full);
 549         put_till_end_and_adv_cursor();
 550         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 551         input_backward(back_cursor);
 552 }
 553
 554 /* Move y lines up, draw last/sole prompt line, editor line[s], and clear tail.
 555  * goal: redraw the prompt+input+cursor in-place, overwriting the previous */
 556 #define redraw(y, back_cursor) draw_custom((y), (back_cursor), 0)
 557
 558 /* Like above, but without moving up, and while using all the prompt lines.
 559  * goal: draw a full prompt+input+cursor unrelated to a previous position.
 560  * note: cmdedit_y always ends up relating to the last/sole prompt line */
 561 #define draw_full(back_cursor) draw_custom(0, (back_cursor), 1)
 562
 563 /* Delete the char in front of the cursor, optionally saving it
 564  * for later putback */
 565 #if !ENABLE_FEATURE_EDITING_VI
 566 static void input_delete(void)
 567 #define input_delete(save) input_delete()
 568 #else
 569 static void input_delete(int save)
 570 #endif
 571 {
 572         int j = cursor;
 573
 574         if (j == (int)command_len)
 575                 return;
 576
 577 #if ENABLE_FEATURE_EDITING_VI
 578         if (save) {
 579                 if (newdelflag) {
 580                         delptr = delbuf;
 581                         newdelflag = 0;
 582                 }
 583                 if ((delptr - delbuf) < DELBUFSIZ)
 584                         *delptr++ = command_ps[j];
 585         }
 586 #endif
 587
 588         memmove(command_ps + j, command_ps + j + 1,
 589                         /* (command_len + 1 [because of NUL]) - (j + 1)
 590                          * simplified into (command_len - j) */
 591                         (command_len - j) * sizeof(command_ps[0]));
 592         command_len--;
 593         put_till_end_and_adv_cursor();
 594         /* Last char is still visible, erase it (and more) */
 595         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
 596         input_backward(cursor - j);     /* back to old pos cursor */
 597 }
 598
 599 #if ENABLE_FEATURE_EDITING_VI
 600 static void put(void)
 601 {
 602         int ocursor;
 603         int j = delptr - delbuf;
 604
 605         if (j == 0)
 606                 return;
 607         ocursor = cursor;
 608         /* open hole and then fill it */
 609         memmove(command_ps + cursor + j, command_ps + cursor,
 610                         (command_len - cursor + 1) * sizeof(command_ps[0]));
 611         memcpy(command_ps + cursor, delbuf, j * sizeof(command_ps[0]));
 612         command_len += j;
 613         put_till_end_and_adv_cursor();
 614         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 615 }
 616 #endif
 617
 618 /* Delete the char in back of the cursor */
 619 static void input_backspace(void)
 620 {
 621         if (cursor > 0) {
 622                 input_backward(1);
 623                 input_delete(0);
 624         }
 625 }
 626
 627 /* Move forward one character */
 628 static void input_forward(void)
 629 {
 630         if (cursor < command_len)
 631                 put_cur_glyph_and_inc_cursor();
 632 }
 633
 634 #if ENABLE_FEATURE_TAB_COMPLETION
 635
 636 //FIXME:
 637 //needs to be more clever: currently it thinks that "foo\ b<TAB>
 638 //matches the file named "foo bar", which is untrue.
 639 //Also, perhaps "foo b<TAB> needs to complete to "foo bar" <cursor>,
 640 //not "foo bar <cursor>...
 641
 642 static void free_tab_completion_data(void)
 643 {
 644         if (matches) {
 645                 while (num_matches)
 646                         free(matches[--num_matches]);
 647                 free(matches);
 648                 matches = NULL;
 649         }
 650 }
 651
 652 static void add_match(char *matched)
 653 {
 654         unsigned char *p = (unsigned char*)matched;
 655         while (*p) {
 656                 /* ESC attack fix: drop any string with control chars */
 657                 if (*p < ' '
 658                  || (!ENABLE_UNICODE_SUPPORT && *p >= 0x7f)
 659                  || (ENABLE_UNICODE_SUPPORT && *p == 0x7f)
 660                 ) {
 661                         free(matched);
 662                         return;
 663                 }
 664                 p++;
 665         }
 666         matches = xrealloc_vector(matches, 4, num_matches);
 667         matches[num_matches] = matched;
 668         num_matches++;
 669 }
 670
 671 # if ENABLE_FEATURE_USERNAME_COMPLETION
 672 /* Replace "~user/..." with "/homedir/...".
 673  * The parameter is malloced, free it or return it
 674  * unchanged if no user is matched.
 675  */
 676 static char *username_path_completion(char *ud)
 677 {
 678         struct passwd *entry;
 679         char *tilde_name = ud;
 680         char *home = NULL;
 681
 682         ud++; /* skip ~ */
 683         if (*ud == '/') {       /* "~/..." */
 684                 home = home_pwd_buf;
 685         } else {
 686                 /* "~user/..." */
 687                 ud = strchr(ud, '/');
 688                 *ud = '\0';           /* "~user" */
 689                 entry = getpwnam(tilde_name + 1);
 690                 *ud = '/';            /* restore "~user/..." */
 691                 if (entry)
 692                         home = entry->pw_dir;
 693         }
 694         if (home) {
 695                 ud = concat_path_file(home, ud);
 696                 free(tilde_name);
 697                 tilde_name = ud;
 698         }
 699         return tilde_name;
 700 }
 701
 702 /* ~use<tab> - find all users with this prefix.
 703  * Return the length of the prefix used for matching.
 704  */
 705 static NOINLINE unsigned complete_username(const char *ud)
 706 {
 707         struct passwd *pw;
 708         unsigned userlen;
 709
 710         ud++; /* skip ~ */
 711         userlen = strlen(ud);
 712
 713         setpwent();
 714         while ((pw = getpwent()) != NULL) {
 715                 /* Null usernames should result in all users as possible completions. */
 716                 if (/* !ud[0] || */ is_prefixed_with(pw->pw_name, ud)) {
 717                         add_match(xasprintf("~%s/", pw->pw_name));
 718                 }
 719         }
 720         endpwent(); /* don't keep password file open */
 721
 722         return 1 + userlen;
 723 }
 724 # endif  /* FEATURE_USERNAME_COMPLETION */
 725
 726 enum {
 727         FIND_EXE_ONLY = 0,
 728         FIND_DIR_ONLY = 1,
 729         FIND_FILE_ONLY = 2,
 730 };
 731
 732 static int path_parse(char ***p)
 733 {
 734         int npth;
 735         const char *pth;
 736         char *tmp;
 737         char **res;
 738
 739         if (state->flags & WITH_PATH_LOOKUP)
 740                 pth = state->path_lookup;
 741         else
 742                 pth = getenv("PATH");
 743
 744         /* PATH="" or PATH=":"? */
 745         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 746                 return 1;
 747
 748         tmp = (char*)pth;
 749         npth = 1; /* path component count */
 750         while (1) {
 751                 tmp = strchr(tmp, ':');
 752                 if (!tmp)
 753                         break;
 754                 tmp++;
 755                 if (*tmp == '\0')
 756                         break;  /* :<empty> */
 757                 npth++;
 758         }
 759
 760         *p = res = xmalloc(npth * sizeof(res[0]));
 761         res[0] = tmp = xstrdup(pth);
 762         npth = 1;
 763         while (1) {
 764                 tmp = strchr(tmp, ':');
 765                 if (!tmp)
 766                         break;
 767                 *tmp++ = '\0'; /* ':' -> '\0' */
 768                 if (*tmp == '\0')
 769                         break; /* :<empty> */
 770                 res[npth++] = tmp;
 771         }
 772         return npth;
 773 }
 774
 775 /* Complete command, directory or file name.
 776  * Return the length of the prefix used for matching.
 777  */
 778 static NOINLINE unsigned complete_cmd_dir_file(const char *command, int type)
 779 {
 780         char *path1[1];
 781         char **paths = path1;
 782         int npaths;
 783         int i;
 784         unsigned pf_len;
 785         const char *pfind;
 786         char *dirbuf = NULL;
 787
 788         npaths = 1;
 789         path1[0] = (char*)".";
 790
 791         pfind = strrchr(command, '/');
 792         if (!pfind) {
 793                 if (type == FIND_EXE_ONLY)
 794                         npaths = path_parse(&paths);
 795                 pfind = command;
 796         } else {
 797                 /* point to 'l' in "..../last_component" */
 798                 pfind++;
 799                 /* dirbuf = ".../.../.../" */
 800                 dirbuf = xstrndup(command, pfind - command);
 801 # if ENABLE_FEATURE_USERNAME_COMPLETION
 802                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 803                         dirbuf = username_path_completion(dirbuf);
 804 # endif
 805                 path1[0] = dirbuf;
 806         }
 807         pf_len = strlen(pfind);
 808
 809 # if ENABLE_FEATURE_SH_STANDALONE && NUM_APPLETS != 1
 810         if (type == FIND_EXE_ONLY && !dirbuf) {
 811                 const char *p = applet_names;
 812
 813                 while (*p) {
 814                         if (strncmp(pfind, p, pf_len) == 0)
 815                                 add_match(xstrdup(p));
 816                         while (*p++ != '\0')
 817                                 continue;
 818                 }
 819         }
 820 # endif
 821
 822         for (i = 0; i < npaths; i++) {
 823                 DIR *dir;
 824                 struct dirent *next;
 825                 struct stat st;
 826                 char *found;
 827
 828                 dir = opendir(paths[i]);
 829                 if (!dir)
 830                         continue; /* don't print an error */
 831
 832                 while ((next = readdir(dir)) != NULL) {
 833                         unsigned len;
 834                         const char *name_found = next->d_name;
 835
 836                         /* .../<tab>: bash 3.2.0 shows dotfiles, but not . and .. */
 837                         if (!pfind[0] && DOT_OR_DOTDOT(name_found))
 838                                 continue;
 839                         /* match? */
 840                         if (!is_prefixed_with(name_found, pfind))
 841                                 continue; /* no */
 842
 843                         found = concat_path_file(paths[i], name_found);
 844                         /* NB: stat() first so that we see is it a directory;
 845                          * but if that fails, use lstat() so that
 846                          * we still match dangling links */
 847                         if (stat(found, &st) && lstat(found, &st))
 848                                 goto cont; /* hmm, remove in progress? */
 849
 850                         /* Save only name */
 851                         len = strlen(name_found);
 852                         found = xrealloc(found, len + 2); /* +2: for slash and NUL */
 853                         strcpy(found, name_found);
 854
 855                         if (S_ISDIR(st.st_mode)) {
 856                                 /* name is a directory, add slash */
 857                                 found[len] = '/';
 858                                 found[len + 1] = '\0';
 859                         } else {
 860                                 /* skip files if looking for dirs only (example: cd) */
 861                                 if (type == FIND_DIR_ONLY)
 862                                         goto cont;
 863                         }
 864                         /* add it to the list */
 865                         add_match(found);
 866                         continue;
 867  cont:
 868                         free(found);
 869                 }
 870                 closedir(dir);
 871         } /* for every path */
 872
 873         if (paths != path1) {
 874                 free(paths[0]); /* allocated memory is only in first member */
 875                 free(paths);
 876         }
 877         free(dirbuf);
 878
 879         return pf_len;
 880 }
 881
 882 /* build_match_prefix:
 883  * On entry, match_buf contains everything up to cursor at the moment <tab>
 884  * was pressed. This function looks at it, figures out what part of it
 885  * constitutes the command/file/directory prefix to use for completion,
 886  * and rewrites match_buf to contain only that part.
 887  */
 888 #define dbg_bmp 0
 889 /* Helpers: */
 890 /* QUOT is used on elements of int_buf[], which are bytes,
 891  * not Unicode chars. Therefore it works correctly even in Unicode mode.
 892  */
 893 #define QUOT (UCHAR_MAX+1)
 894 static void remove_chunk(int16_t *int_buf, int beg, int end)
 895 {
 896         /* beg must be <= end */
 897         if (beg == end)
 898                 return;
 899
 900         while ((int_buf[beg] = int_buf[end]) != 0)
 901                 beg++, end++;
 902
 903         if (dbg_bmp) {
 904                 int i;
 905                 for (i = 0; int_buf[i]; i++)
 906                         bb_putchar((unsigned char)int_buf[i]);
 907                 bb_putchar('\n');
 908         }
 909 }
 910 /* Caller ensures that match_buf points to a malloced buffer
 911  * big enough to hold strlen(match_buf)*2 + 2
 912  */
 913 static NOINLINE int build_match_prefix(char *match_buf)
 914 {
 915         int i, j;
 916         int command_mode;
 917         int16_t *int_buf = (int16_t*)match_buf;
 918
 919         if (dbg_bmp) printf("\n%s\n", match_buf);
 920
 921         /* Copy in reverse order, since they overlap */
 922         i = strlen(match_buf);
 923         do {
 924                 int_buf[i] = (unsigned char)match_buf[i];
 925                 i--;
 926         } while (i >= 0);
 927
 928         /* Mark every \c as "quoted c" */
 929         for (i = 0; int_buf[i]; i++) {
 930                 if (int_buf[i] == '\\') {
 931                         remove_chunk(int_buf, i, i + 1);
 932                         int_buf[i] |= QUOT;
 933                 }
 934         }
 935         /* Quote-mark "chars" and 'chars', drop delimiters */
 936         {
 937                 int in_quote = 0;
 938                 i = 0;
 939                 while (int_buf[i]) {
 940                         int cur = int_buf[i];
 941                         if (!cur)
 942                                 break;
 943                         if (cur == '\'' || cur == '"') {
 944                                 if (!in_quote || (cur == in_quote)) {
 945                                         in_quote ^= cur;
 946                                         remove_chunk(int_buf, i, i + 1);
 947                                         continue;
 948                                 }
 949                         }
 950                         if (in_quote)
 951                                 int_buf[i] = cur | QUOT;
 952                         i++;
 953                 }
 954         }
 955
 956         /* Remove everything up to command delimiters:
 957          * ';' ';;' '&' '|' '&&' '||',
 958          * but careful with '>&' '<&' '>|'
 959          */
 960         for (i = 0; int_buf[i]; i++) {
 961                 int cur = int_buf[i];
 962                 if (cur == ';' || cur == '&' || cur == '|') {
 963                         int prev = i ? int_buf[i - 1] : 0;
 964                         if (cur == '&' && (prev == '>' || prev == '<')) {
 965                                 continue;
 966                         } else if (cur == '|' && prev == '>') {
 967                                 continue;
 968                         }
 969                         remove_chunk(int_buf, 0, i + 1 + (cur == int_buf[i + 1]));
 970                         i = -1;  /* back to square 1 */
 971                 }
 972         }
 973         /* Remove all `cmd` */
 974         for (i = 0; int_buf[i]; i++) {
 975                 if (int_buf[i] == '`') {
 976                         for (j = i + 1; int_buf[j]; j++) {
 977                                 if (int_buf[j] == '`') {
 978                                         /* `cmd` should count as a word:
 979                                          * `cmd` c<tab> should search for files c*,
 980                                          * not commands c*. Therefore we don't drop
 981                                          * `cmd` entirely, we replace it with single `.
 982                                          */
 983                                         remove_chunk(int_buf, i, j);
 984                                         goto next;
 985                                 }
 986                         }
 987                         /* No closing ` - command mode, remove all up to ` */
 988                         remove_chunk(int_buf, 0, i + 1);
 989                         break;
 990  next: ;
 991                 }
 992         }
 993
 994         /* Remove "cmd (" and "cmd {"
 995          * Example: "if { c<tab>"
 996          * In this example, c should be matched as command pfx.
 997          */
 998         for (i = 0; int_buf[i]; i++) {
 999                 if (int_buf[i] == '(' || int_buf[i] == '{') {
1000                         remove_chunk(int_buf, 0, i + 1);
1001                         i = -1;  /* back to square 1 */
1002                 }
1003         }
1004
1005         /* Remove leading unquoted spaces */
1006         for (i = 0; int_buf[i]; i++)
1007                 if (int_buf[i] != ' ')
1008                         break;
1009         remove_chunk(int_buf, 0, i);
1010
1011         /* Determine completion mode */
1012         command_mode = FIND_EXE_ONLY;
1013         for (i = 0; int_buf[i]; i++) {
1014                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
1015                         if (int_buf[i] == ' '
1016                          && command_mode == FIND_EXE_ONLY
1017                          && (char)int_buf[0] == 'c'
1018                          && (char)int_buf[1] == 'd'
1019                          && i == 2 /* -> int_buf[2] == ' ' */
1020                         ) {
1021                                 command_mode = FIND_DIR_ONLY;
1022                         } else {
1023                                 command_mode = FIND_FILE_ONLY;
1024                                 break;
1025                         }
1026                 }
1027         }
1028         if (dbg_bmp) printf("command_mode(0:exe/1:dir/2:file):%d\n", command_mode);
1029
1030         /* Remove everything except last word */
1031         for (i = 0; int_buf[i]; i++) /* quasi-strlen(int_buf) */
1032                 continue;
1033         for (--i; i >= 0; i--) {
1034                 int cur = int_buf[i];
1035                 if (cur == ' ' || cur == '<' || cur == '>' || cur == '|' || cur == '&') {
1036                         remove_chunk(int_buf, 0, i + 1);
1037                         break;
1038                 }
1039         }
1040
1041         /* Convert back to string of _chars_ */
1042         i = 0;
1043         while ((match_buf[i] = int_buf[i]) != '\0')
1044                 i++;
1045
1046         if (dbg_bmp) printf("final match_buf:'%s'\n", match_buf);
1047
1048         return command_mode;
1049 }
1050
1051 /*
1052  * Display by column (original idea from ls applet,
1053  * very optimized by me [Vladimir] :)
1054  */
1055 static void showfiles(void)
1056 {
1057         int ncols, row;
1058         int column_width = 0;
1059         int nfiles = num_matches;
1060         int nrows = nfiles;
1061         int l;
1062
1063         /* find the longest file name - use that as the column width */
1064         for (row = 0; row < nrows; row++) {
1065                 l = unicode_strwidth(matches[row]);
1066                 if (column_width < l)
1067                         column_width = l;
1068         }
1069         column_width += 2;              /* min space for columns */
1070         ncols = cmdedit_termw / column_width;
1071
1072         if (ncols > 1) {
1073                 nrows /= ncols;
1074                 if (nfiles % ncols)
1075                         nrows++;        /* round up fractionals */
1076         } else {
1077                 ncols = 1;
1078         }
1079         for (row = 0; row < nrows; row++) {
1080                 int n = row;
1081                 int nc;
1082
1083                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
1084                         printf("%s%-*s", matches[n],
1085                                 (int)(column_width - unicode_strwidth(matches[n])), ""
1086                         );
1087                 }
1088                 if (ENABLE_UNICODE_SUPPORT)
1089                         puts(printable_string(matches[n]));
1090                 else
1091                         puts(matches[n]);
1092         }
1093 }
1094
1095 static const char *is_special_char(char c)
1096 {
1097         return strchr(" `\"#$%^&*()=+{}[]:;'|\\<>", c);
1098 }
1099
1100 static char *quote_special_chars(char *found)
1101 {
1102         int l = 0;
1103         char *s = xzalloc((strlen(found) + 1) * 2);
1104
1105         while (*found) {
1106                 if (is_special_char(*found))
1107                         s[l++] = '\\';
1108                 s[l++] = *found++;
1109         }
1110         /* s[l] = '\0'; - already is */
1111         return s;
1112 }
1113
1114 /* Do TAB completion */
1115 static NOINLINE void input_tab(smallint *lastWasTab)
1116 {
1117         char *chosen_match;
1118         char *match_buf;
1119         size_t len_found;
1120         /* Length of string used for matching */
1121         unsigned match_pfx_len = match_pfx_len;
1122         int find_type;
1123 # if ENABLE_UNICODE_SUPPORT
1124         /* cursor pos in command converted to multibyte form */
1125         int cursor_mb;
1126 # endif
1127         if (!(state->flags & TAB_COMPLETION))
1128                 return;
1129
1130         if (*lastWasTab) {
1131                 /* The last char was a TAB too.
1132                  * Print a list of all the available choices.
1133                  */
1134                 if (num_matches > 0) {
1135                         /* cursor will be changed by goto_new_line() */
1136                         int sav_cursor = cursor;
1137                         goto_new_line();
1138                         showfiles();
1139                         draw_full(command_len - sav_cursor);
1140                 }
1141                 return;
1142         }
1143
1144         *lastWasTab = 1;
1145         chosen_match = NULL;
1146
1147         /* Make a local copy of the string up to the position of the cursor.
1148          * build_match_prefix will expand it into int16_t's, need to allocate
1149          * twice as much as the string_len+1.
1150          * (we then also (ab)use this extra space later - see (**))
1151          */
1152         match_buf = xmalloc(MAX_LINELEN * sizeof(int16_t));
1153 # if !ENABLE_UNICODE_SUPPORT
1154         save_string(match_buf, cursor + 1); /* +1 for NUL */
1155 # else
1156         {
1157                 CHAR_T wc = command_ps[cursor];
1158                 command_ps[cursor] = BB_NUL;
1159                 save_string(match_buf, MAX_LINELEN);
1160                 command_ps[cursor] = wc;
1161                 cursor_mb = strlen(match_buf);
1162         }
1163 # endif
1164         find_type = build_match_prefix(match_buf);
1165
1166         /* Free up any memory already allocated */
1167         free_tab_completion_data();
1168
1169 # if ENABLE_FEATURE_USERNAME_COMPLETION
1170         /* If the word starts with ~ and there is no slash in the word,
1171          * then try completing this word as a username. */
1172         if (state->flags & USERNAME_COMPLETION)
1173                 if (match_buf[0] == '~' && strchr(match_buf, '/') == NULL)
1174                         match_pfx_len = complete_username(match_buf);
1175 # endif
1176         /* If complete_username() did not match,
1177          * try to match a command in $PATH, or a directory, or a file */
1178         if (!matches)
1179                 match_pfx_len = complete_cmd_dir_file(match_buf, find_type);
1180
1181         /* Account for backslashes which will be inserted
1182          * by quote_special_chars() later */
1183         {
1184                 const char *e = match_buf + strlen(match_buf);
1185                 const char *s = e - match_pfx_len;
1186                 while (s < e)
1187                         if (is_special_char(*s++))
1188                                 match_pfx_len++;
1189         }
1190
1191         /* Remove duplicates */
1192         if (matches) {
1193                 unsigned i, n = 0;
1194                 qsort_string_vector(matches, num_matches);
1195                 for (i = 0; i < num_matches - 1; ++i) {
1196                         //if (matches[i] && matches[i+1]) { /* paranoia */
1197                                 if (strcmp(matches[i], matches[i+1]) == 0) {
1198                                         free(matches[i]);
1199                                         //matches[i] = NULL; /* paranoia */
1200                                 } else {
1201                                         matches[n++] = matches[i];
1202                                 }
1203                         //}
1204                 }
1205                 matches[n++] = matches[i];
1206                 num_matches = n;
1207         }
1208
1209         /* Did we find exactly one match? */
1210         if (num_matches != 1) { /* no */
1211                 char *cp;
1212                 beep();
1213                 if (!matches)
1214                         goto ret; /* no matches at all */
1215                 /* Find common prefix */
1216                 chosen_match = xstrdup(matches[0]);
1217                 for (cp = chosen_match; *cp; cp++) {
1218                         unsigned n;
1219                         for (n = 1; n < num_matches; n++) {
1220                                 if (matches[n][cp - chosen_match] != *cp) {
1221                                         goto stop;
1222                                 }
1223                         }
1224                 }
1225  stop:
1226                 if (cp == chosen_match) { /* have unique prefix? */
1227                         goto ret; /* no */
1228                 }
1229                 *cp = '\0';
1230                 cp = quote_special_chars(chosen_match);
1231                 free(chosen_match);
1232                 chosen_match = cp;
1233                 len_found = strlen(chosen_match);
1234         } else {                        /* exactly one match */
1235                 /* Next <tab> is not a double-tab */
1236                 *lastWasTab = 0;
1237
1238                 chosen_match = quote_special_chars(matches[0]);
1239                 len_found = strlen(chosen_match);
1240                 if (chosen_match[len_found-1] != '/') {
1241                         chosen_match[len_found] = ' ';
1242                         chosen_match[++len_found] = '\0';
1243                 }
1244         }
1245
1246 # if !ENABLE_UNICODE_SUPPORT
1247         /* Have space to place the match? */
1248         /* The result consists of three parts with these lengths: */
1249         /* cursor + (len_found - match_pfx_len) + (command_len - cursor) */
1250         /* it simplifies into: */
1251         if ((int)(len_found - match_pfx_len + command_len) < S.maxsize) {
1252                 int pos;
1253                 /* save tail */
1254                 strcpy(match_buf, &command_ps[cursor]);
1255                 /* add match and tail */
1256                 sprintf(&command_ps[cursor], "%s%s", chosen_match + match_pfx_len, match_buf);
1257                 command_len = strlen(command_ps);
1258                 /* new pos */
1259                 pos = cursor + len_found - match_pfx_len;
1260                 /* write out the matched command */
1261                 redraw(cmdedit_y, command_len - pos);
1262         }
1263 # else
1264         {
1265                 /* Use 2nd half of match_buf as scratch space - see (**) */
1266                 char *command = match_buf + MAX_LINELEN;
1267                 int len = save_string(command, MAX_LINELEN);
1268                 /* Have space to place the match? */
1269                 /* cursor_mb + (len_found - match_pfx_len) + (len - cursor_mb) */
1270                 if ((int)(len_found - match_pfx_len + len) < MAX_LINELEN) {
1271                         int pos;
1272                         /* save tail */
1273                         strcpy(match_buf, &command[cursor_mb]);
1274                         /* where do we want to have cursor after all? */
1275                         strcpy(&command[cursor_mb], chosen_match + match_pfx_len);
1276                         len = load_string(command);
1277                         /* add match and tail */
1278                         sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf);
1279                         command_len = load_string(command);
1280                         /* write out the matched command */
1281                         /* paranoia: load_string can return 0 on conv error,
1282                          * prevent passing pos = (0 - 12) to redraw */
1283                         pos = command_len - len;
1284                         redraw(cmdedit_y, pos >= 0 ? pos : 0);
1285                 }
1286         }
1287 # endif
1288  ret:
1289         free(chosen_match);
1290         free(match_buf);
1291 }
1292
1293 #endif  /* FEATURE_TAB_COMPLETION */
1294
1295
1296 line_input_t* FAST_FUNC new_line_input_t(int flags)
1297 {
1298         line_input_t *n = xzalloc(sizeof(*n));
1299         n->flags = flags;
1300         n->timeout = -1;
1301 #if MAX_HISTORY > 0
1302         n->max_history = MAX_HISTORY;
1303 #endif
1304         return n;
1305 }
1306
1307
1308 #if MAX_HISTORY > 0
1309
1310 unsigned FAST_FUNC size_from_HISTFILESIZE(const char *hp)
1311 {
1312         int size = MAX_HISTORY;
1313         if (hp) {
1314                 size = atoi(hp);
1315                 if (size <= 0)
1316                         return 1;
1317                 if (size > MAX_HISTORY)
1318                         return MAX_HISTORY;
1319         }
1320         return size;
1321 }
1322
1323 static void save_command_ps_at_cur_history(void)
1324 {
1325         if (command_ps[0] != BB_NUL) {
1326                 int cur = state->cur_history;
1327                 free(state->history[cur]);
1328
1329 # if ENABLE_UNICODE_SUPPORT
1330                 {
1331                         char tbuf[MAX_LINELEN];
1332                         save_string(tbuf, sizeof(tbuf));
1333                         state->history[cur] = xstrdup(tbuf);
1334                 }
1335 # else
1336                 state->history[cur] = xstrdup(command_ps);
1337 # endif
1338         }
1339 }
1340
1341 /* state->flags is already checked to be nonzero */
1342 static int get_previous_history(void)
1343 {
1344         if ((state->flags & DO_HISTORY) && state->cur_history) {
1345                 save_command_ps_at_cur_history();
1346                 state->cur_history--;
1347                 return 1;
1348         }
1349         beep();
1350         return 0;
1351 }
1352
1353 static int get_next_history(void)
1354 {
1355         if (state->flags & DO_HISTORY) {
1356                 if (state->cur_history < state->cnt_history) {
1357                         save_command_ps_at_cur_history(); /* save the current history line */
1358                         return ++state->cur_history;
1359                 }
1360         }
1361         beep();
1362         return 0;
1363 }
1364
1365 /* Lists command history. Used by shell 'history' builtins */
1366 void FAST_FUNC show_history(const line_input_t *st)
1367 {
1368         int i;
1369
1370         if (!st)
1371                 return;
1372         for (i = 0; i < st->cnt_history; i++)
1373                 printf("%4d %s\n", i, st->history[i]);
1374 }
1375
1376 void FAST_FUNC free_line_input_t(line_input_t *n)
1377 {
1378 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1379         int i = n->cnt_history;
1380         while (i > 0)
1381                 free(n->history[--i]);
1382 #endif
1383         free(n);
1384 }
1385
1386 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
1387 /* We try to ensure that concurrent additions to the history
1388  * do not overwrite each other.
1389  * Otherwise shell users get unhappy.
1390  *
1391  * History file is trimmed lazily, when it grows several times longer
1392  * than configured MAX_HISTORY lines.
1393  */
1394
1395 /* state->flags is already checked to be nonzero */
1396 static void load_history(line_input_t *st_parm)
1397 {
1398         char *temp_h[MAX_HISTORY];
1399         char *line;
1400         FILE *fp;
1401         unsigned idx, i, line_len;
1402
1403         /* NB: do not trash old history if file can't be opened */
1404
1405         fp = fopen_for_read(st_parm->hist_file);
1406         if (fp) {
1407                 /* clean up old history */
1408                 for (idx = st_parm->cnt_history; idx > 0;) {
1409                         idx--;
1410                         free(st_parm->history[idx]);
1411                         st_parm->history[idx] = NULL;
1412                 }
1413
1414                 /* fill temp_h[], retaining only last MAX_HISTORY lines */
1415                 memset(temp_h, 0, sizeof(temp_h));
1416                 idx = 0;
1417                 st_parm->cnt_history_in_file = 0;
1418                 while ((line = xmalloc_fgetline(fp)) != NULL) {
1419                         if (line[0] == '\0') {
1420                                 free(line);
1421                                 continue;
1422                         }
1423                         free(temp_h[idx]);
1424                         temp_h[idx] = line;
1425                         st_parm->cnt_history_in_file++;
1426                         idx++;
1427                         if (idx == st_parm->max_history)
1428                                 idx = 0;
1429                 }
1430                 fclose(fp);
1431
1432                 /* find first non-NULL temp_h[], if any */
1433                 if (st_parm->cnt_history_in_file) {
1434                         while (temp_h[idx] == NULL) {
1435                                 idx++;
1436                                 if (idx == st_parm->max_history)
1437                                         idx = 0;
1438                         }
1439                 }
1440
1441                 /* copy temp_h[] to st_parm->history[] */
1442                 for (i = 0; i < st_parm->max_history;) {
1443                         line = temp_h[idx];
1444                         if (!line)
1445                                 break;
1446                         idx++;
1447                         if (idx == st_parm->max_history)
1448                                 idx = 0;
1449                         line_len = strlen(line);
1450                         if (line_len >= MAX_LINELEN)
1451                                 line[MAX_LINELEN-1] = '\0';
1452                         st_parm->history[i++] = line;
1453                 }
1454                 st_parm->cnt_history = i;
1455                 if (ENABLE_FEATURE_EDITING_SAVE_ON_EXIT)
1456                         st_parm->cnt_history_in_file = i;
1457         }
1458 }
1459
1460 #  if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1461 void save_history(line_input_t *st)
1462 {
1463         FILE *fp;
1464
1465         if (!st->hist_file)
1466                 return;
1467         if (st->cnt_history <= st->cnt_history_in_file)
1468                 return;
1469
1470         fp = fopen(st->hist_file, "a");
1471         if (fp) {
1472                 int i, fd;
1473                 char *new_name;
1474                 line_input_t *st_temp;
1475
1476                 for (i = st->cnt_history_in_file; i < st->cnt_history; i++)
1477                         fprintf(fp, "%s\n", st->history[i]);
1478                 fclose(fp);
1479
1480                 /* we may have concurrently written entries from others.
1481                  * load them */
1482                 st_temp = new_line_input_t(st->flags);
1483                 st_temp->hist_file = st->hist_file;
1484                 st_temp->max_history = st->max_history;
1485                 load_history(st_temp);
1486
1487                 /* write out temp file and replace hist_file atomically */
1488                 new_name = xasprintf("%s.%u.new", st->hist_file, (int) getpid());
1489                 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1490                 if (fd >= 0) {
1491                         fp = xfdopen_for_write(fd);
1492                         for (i = 0; i < st_temp->cnt_history; i++)
1493                                 fprintf(fp, "%s\n", st_temp->history[i]);
1494                         fclose(fp);
1495                         if (rename(new_name, st->hist_file) == 0)
1496                                 st->cnt_history_in_file = st_temp->cnt_history;
1497                 }
1498                 free(new_name);
1499                 free_line_input_t(st_temp);
1500         }
1501 }
1502 #  else
1503 static void save_history(char *str)
1504 {
1505         int fd;
1506         int len, len2;
1507
1508         if (!state->hist_file)
1509                 return;
1510
1511         fd = open(state->hist_file, O_WRONLY | O_CREAT | O_APPEND, 0600);
1512         if (fd < 0)
1513                 return;
1514         xlseek(fd, 0, SEEK_END); /* paranoia */
1515         len = strlen(str);
1516         str[len] = '\n'; /* we (try to) do atomic write */
1517         len2 = full_write(fd, str, len + 1);
1518         str[len] = '\0';
1519         close(fd);
1520         if (len2 != len + 1)
1521                 return; /* "wtf?" */
1522
1523         /* did we write so much that history file needs trimming? */
1524         state->cnt_history_in_file++;
1525         if (state->cnt_history_in_file > state->max_history * 4) {
1526                 char *new_name;
1527                 line_input_t *st_temp;
1528
1529                 /* we may have concurrently written entries from others.
1530                  * load them */
1531                 st_temp = new_line_input_t(state->flags);
1532                 st_temp->hist_file = state->hist_file;
1533                 st_temp->max_history = state->max_history;
1534                 load_history(st_temp);
1535
1536                 /* write out temp file and replace hist_file atomically */
1537                 new_name = xasprintf("%s.%u.new", state->hist_file, (int) getpid());
1538                 fd = open(new_name, O_WRONLY | O_CREAT | O_TRUNC, 0600);
1539                 if (fd >= 0) {
1540                         FILE *fp;
1541                         int i;
1542
1543                         fp = xfdopen_for_write(fd);
1544                         for (i = 0; i < st_temp->cnt_history; i++)
1545                                 fprintf(fp, "%s\n", st_temp->history[i]);
1546                         fclose(fp);
1547                         if (rename(new_name, state->hist_file) == 0)
1548                                 state->cnt_history_in_file = st_temp->cnt_history;
1549                 }
1550                 free(new_name);
1551                 free_line_input_t(st_temp);
1552         }
1553 }
1554 #  endif
1555 # else
1556 #  define load_history(a) ((void)0)
1557 #  define save_history(a) ((void)0)
1558 # endif /* FEATURE_COMMAND_SAVEHISTORY */
1559
1560 static void remember_in_history(char *str)
1561 {
1562         int i;
1563
1564         if (!(state->flags & DO_HISTORY))
1565                 return;
1566         if (str[0] == '\0')
1567                 return;
1568         i = state->cnt_history;
1569         /* Don't save dupes */
1570         if (i && strcmp(state->history[i-1], str) == 0)
1571                 return;
1572
1573         free(state->history[state->max_history]); /* redundant, paranoia */
1574         state->history[state->max_history] = NULL; /* redundant, paranoia */
1575
1576         /* If history[] is full, remove the oldest command */
1577         /* we need to keep history[state->max_history] empty, hence >=, not > */
1578         if (i >= state->max_history) {
1579                 free(state->history[0]);
1580                 for (i = 0; i < state->max_history-1; i++)
1581                         state->history[i] = state->history[i+1];
1582                 /* i == state->max_history-1 */
1583 # if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1584                 if (state->cnt_history_in_file)
1585                         state->cnt_history_in_file--;
1586 # endif
1587         }
1588         /* i <= state->max_history-1 */
1589         state->history[i++] = xstrdup(str);
1590         /* i <= state->max_history */
1591         state->cur_history = i;
1592         state->cnt_history = i;
1593 # if ENABLE_FEATURE_EDITING_SAVEHISTORY && !ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
1594         save_history(str);
1595 # endif
1596 }
1597
1598 #else /* MAX_HISTORY == 0 */
1599 # define remember_in_history(a) ((void)0)
1600 #endif /* MAX_HISTORY */
1601
1602
1603 #if ENABLE_FEATURE_EDITING_VI
1604 /*
1605  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1606  */
1607 static void
1608 vi_Word_motion(int eat)
1609 {
1610         CHAR_T *command = command_ps;
1611
1612         while (cursor < command_len && !BB_isspace(command[cursor]))
1613                 input_forward();
1614         if (eat) while (cursor < command_len && BB_isspace(command[cursor]))
1615                 input_forward();
1616 }
1617
1618 static void
1619 vi_word_motion(int eat)
1620 {
1621         CHAR_T *command = command_ps;
1622
1623         if (BB_isalnum_or_underscore(command[cursor])) {
1624                 while (cursor < command_len
1625                  && (BB_isalnum_or_underscore(command[cursor+1]))
1626                 ) {
1627                         input_forward();
1628                 }
1629         } else if (BB_ispunct(command[cursor])) {
1630                 while (cursor < command_len && BB_ispunct(command[cursor+1]))
1631                         input_forward();
1632         }
1633
1634         if (cursor < command_len)
1635                 input_forward();
1636
1637         if (eat) {
1638                 while (cursor < command_len && BB_isspace(command[cursor]))
1639                         input_forward();
1640         }
1641 }
1642
1643 static void
1644 vi_End_motion(void)
1645 {
1646         CHAR_T *command = command_ps;
1647
1648         input_forward();
1649         while (cursor < command_len && BB_isspace(command[cursor]))
1650                 input_forward();
1651         while (cursor < command_len-1 && !BB_isspace(command[cursor+1]))
1652                 input_forward();
1653 }
1654
1655 static void
1656 vi_end_motion(void)
1657 {
1658         CHAR_T *command = command_ps;
1659
1660         if (cursor >= command_len-1)
1661                 return;
1662         input_forward();
1663         while (cursor < command_len-1 && BB_isspace(command[cursor]))
1664                 input_forward();
1665         if (cursor >= command_len-1)
1666                 return;
1667         if (BB_isalnum_or_underscore(command[cursor])) {
1668                 while (cursor < command_len-1
1669                  && (BB_isalnum_or_underscore(command[cursor+1]))
1670                 ) {
1671                         input_forward();
1672                 }
1673         } else if (BB_ispunct(command[cursor])) {
1674                 while (cursor < command_len-1 && BB_ispunct(command[cursor+1]))
1675                         input_forward();
1676         }
1677 }
1678
1679 static void
1680 vi_Back_motion(void)
1681 {
1682         CHAR_T *command = command_ps;
1683
1684         while (cursor > 0 && BB_isspace(command[cursor-1]))
1685                 input_backward(1);
1686         while (cursor > 0 && !BB_isspace(command[cursor-1]))
1687                 input_backward(1);
1688 }
1689
1690 static void
1691 vi_back_motion(void)
1692 {
1693         CHAR_T *command = command_ps;
1694
1695         if (cursor <= 0)
1696                 return;
1697         input_backward(1);
1698         while (cursor > 0 && BB_isspace(command[cursor]))
1699                 input_backward(1);
1700         if (cursor <= 0)
1701                 return;
1702         if (BB_isalnum_or_underscore(command[cursor])) {
1703                 while (cursor > 0
1704                  && (BB_isalnum_or_underscore(command[cursor-1]))
1705                 ) {
1706                         input_backward(1);
1707                 }
1708         } else if (BB_ispunct(command[cursor])) {
1709                 while (cursor > 0 && BB_ispunct(command[cursor-1]))
1710                         input_backward(1);
1711         }
1712 }
1713 #endif
1714
1715 /* Modelled after bash 4.0 behavior of Ctrl-<arrow> */
1716 static void ctrl_left(void)
1717 {
1718         CHAR_T *command = command_ps;
1719
1720         while (1) {
1721                 CHAR_T c;
1722
1723                 input_backward(1);
1724                 if (cursor == 0)
1725                         break;
1726                 c = command[cursor];
1727                 if (c != ' ' && !BB_ispunct(c)) {
1728                         /* we reached a "word" delimited by spaces/punct.
1729                          * go to its beginning */
1730                         while (1) {
1731                                 c = command[cursor - 1];
1732                                 if (c == ' ' || BB_ispunct(c))
1733                                         break;
1734                                 input_backward(1);
1735                                 if (cursor == 0)
1736                                         break;
1737                         }
1738                         break;
1739                 }
1740         }
1741 }
1742 static void ctrl_right(void)
1743 {
1744         CHAR_T *command = command_ps;
1745
1746         while (1) {
1747                 CHAR_T c;
1748
1749                 c = command[cursor];
1750                 if (c == BB_NUL)
1751                         break;
1752                 if (c != ' ' && !BB_ispunct(c)) {
1753                         /* we reached a "word" delimited by spaces/punct.
1754                          * go to its end + 1 */
1755                         while (1) {
1756                                 input_forward();
1757                                 c = command[cursor];
1758                                 if (c == BB_NUL || c == ' ' || BB_ispunct(c))
1759                                         break;
1760                         }
1761                         break;
1762                 }
1763                 input_forward();
1764         }
1765 }
1766
1767
1768 /*
1769  * read_line_input and its helpers
1770  */
1771
1772 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
1773 static void ask_terminal(void)
1774 {
1775         /* Ask terminal where is the cursor now.
1776          * lineedit_read_key handles response and corrects
1777          * our idea of current cursor position.
1778          * Testcase: run "echo -n long_line_long_line_long_line",
1779          * then type in a long, wrapping command and try to
1780          * delete it using backspace key.
1781          * Note: we print it _after_ prompt, because
1782          * prompt may contain CR. Example: PS1='\[\r\n\]\w '
1783          */
1784         /* Problem: if there is buffered input on stdin,
1785          * the response will be delivered later,
1786          * possibly to an unsuspecting application.
1787          * Testcase: "sleep 1; busybox ash" + press and hold [Enter].
1788          * Result:
1789          * ~/srcdevel/bbox/fix/busybox.t4 #
1790          * ~/srcdevel/bbox/fix/busybox.t4 #
1791          * ^[[59;34~/srcdevel/bbox/fix/busybox.t4 #  <-- garbage
1792          * ~/srcdevel/bbox/fix/busybox.t4 #
1793          *
1794          * Checking for input with poll only makes the race narrower,
1795          * I still can trigger it. Strace:
1796          *
1797          * write(1, "~/srcdevel/bbox/fix/busybox.t4 # ", 33) = 33
1798          * poll([{fd=0, events=POLLIN}], 1, 0) = 0 (Timeout)  <-- no input exists
1799          * write(1, "\33[6n", 4) = 4  <-- send the ESC sequence, quick!
1800          * poll([{fd=0, events=POLLIN}], 1, -1) = 1 ([{fd=0, revents=POLLIN}])
1801          * read(0, "\n", 1)      = 1  <-- oh crap, user's input got in first
1802          */
1803         struct pollfd pfd;
1804
1805         pfd.fd = STDIN_FILENO;
1806         pfd.events = POLLIN;
1807         if (safe_poll(&pfd, 1, 0) == 0) {
1808                 S.sent_ESC_br6n = 1;
1809                 fputs(ESC"[6n", stdout);
1810                 fflush_all(); /* make terminal see it ASAP! */
1811         }
1812 }
1813 #else
1814 #define ask_terminal() ((void)0)
1815 #endif
1816
1817 /* Note about multi-line PS1 (e.g. "\n\w \u@\h\n> ") and prompt redrawing:
1818  *
1819  * If the prompt has any newlines, after we print it once we use only its last
1820  * line to redraw in-place, which makes it simpler to calculate how many lines
1821  * we should move the cursor up to align the redraw (cmdedit_y). The earlier
1822  * prompt lines just stay on screen and we redraw below them.
1823  *
1824  * Use cases for all prompt lines beyond the initial draw:
1825  * - After clear-screen (^L) or after displaying tab-completion choices, we
1826  *   print the full prompt, as it isn't redrawn in-place.
1827  * - During terminal resize we could try to redraw all lines, but we don't,
1828  *   because it requires delicate alignment, it's good enough with only the
1829  *   last line, and doing it wrong is arguably worse than not doing it at all.
1830  *
1831  * Terminology wise, if it doesn't mention "full", then it means the last/sole
1832  * prompt line. We use the prompt (last/sole line) while redrawing in-place,
1833  * and the full where we need a fresh one unrelated to an earlier position.
1834  *
1835  * If PS1 is not multiline, the last/sole line and the full are the same string.
1836  */
1837
1838 /* Called just once at read_line_input() init time */
1839 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1840 static void parse_and_put_prompt(const char *prmt_ptr)
1841 {
1842         const char *p;
1843         cmdedit_prompt = prompt_last_line = prmt_ptr;
1844         p = strrchr(prmt_ptr, '\n');
1845         if (p)
1846                 prompt_last_line = p + 1;
1847         cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
1848         put_prompt();
1849 }
1850 #else
1851 static void parse_and_put_prompt(const char *prmt_ptr)
1852 {
1853         int prmt_size = 0;
1854         char *prmt_mem_ptr = xzalloc(1);
1855 # if ENABLE_USERNAME_OR_HOMEDIR
1856         char *cwd_buf = NULL;
1857 # endif
1858         char flg_not_length = '[';
1859         char cbuf[2];
1860
1861         /*cmdedit_prmt_len = 0; - already is */
1862
1863         cbuf[1] = '\0'; /* never changes */
1864
1865         while (*prmt_ptr) {
1866                 char timebuf[sizeof("HH:MM:SS")];
1867                 char *free_me = NULL;
1868                 char *pbuf;
1869                 char c;
1870
1871                 pbuf = cbuf;
1872                 c = *prmt_ptr++;
1873                 if (c == '\\') {
1874                         const char *cp;
1875                         int l;
1876 /*
1877  * Supported via bb_process_escape_sequence:
1878  * \a   ASCII bell character (07)
1879  * \e   ASCII escape character (033)
1880  * \n   newline
1881  * \r   carriage return
1882  * \\   backslash
1883  * \nnn char with octal code nnn
1884  * Supported:
1885  * \$   if the effective UID is 0, a #, otherwise a $
1886  * \w   current working directory, with $HOME abbreviated with a tilde
1887  *      Note: we do not support $PROMPT_DIRTRIM=n feature
1888  * \W   basename of the current working directory, with $HOME abbreviated with a tilde
1889  * \h   hostname up to the first '.'
1890  * \H   hostname
1891  * \u   username
1892  * \[   begin a sequence of non-printing characters
1893  * \]   end a sequence of non-printing characters
1894  * \T   current time in 12-hour HH:MM:SS format
1895  * \@   current time in 12-hour am/pm format
1896  * \A   current time in 24-hour HH:MM format
1897  * \t   current time in 24-hour HH:MM:SS format
1898  *      (all of the above work as \A)
1899  * Not supported:
1900  * \!   history number of this command
1901  * \#   command number of this command
1902  * \j   number of jobs currently managed by the shell
1903  * \l   basename of the shell's terminal device name
1904  * \s   name of the shell, the basename of $0 (the portion following the final slash)
1905  * \V   release of bash, version + patch level (e.g., 2.00.0)
1906  * \d   date in "Weekday Month Date" format (e.g., "Tue May 26")
1907  * \D{format}
1908  *      format is passed to strftime(3).
1909  *      An empty format results in a locale-specific time representation.
1910  *      The braces are required.
1911  * Mishandled by bb_process_escape_sequence:
1912  * \v   version of bash (e.g., 2.00)
1913  */
1914                         cp = prmt_ptr;
1915                         c = *cp;
1916                         if (c != 't') /* don't treat \t as tab */
1917                                 c = bb_process_escape_sequence(&prmt_ptr);
1918                         if (prmt_ptr == cp) {
1919                                 if (*cp == '\0')
1920                                         break;
1921                                 c = *prmt_ptr++;
1922
1923                                 switch (c) {
1924 # if ENABLE_USERNAME_OR_HOMEDIR
1925                                 case 'u':
1926                                         pbuf = user_buf ? user_buf : (char*)"";
1927                                         break;
1928 # endif
1929                                 case 'H':
1930                                 case 'h':
1931                                         pbuf = free_me = safe_gethostname();
1932                                         if (c == 'h')
1933                                                 strchrnul(pbuf, '.')[0] = '\0';
1934                                         break;
1935                                 case '$':
1936                                         c = (geteuid() == 0 ? '#' : '$');
1937                                         break;
1938                                 case 'T': /* 12-hour HH:MM:SS format */
1939                                 case '@': /* 12-hour am/pm format */
1940                                 case 'A': /* 24-hour HH:MM format */
1941                                 case 't': /* 24-hour HH:MM:SS format */
1942                                         /* We show all of them as 24-hour HH:MM */
1943                                         strftime_HHMMSS(timebuf, sizeof(timebuf), NULL)[-3] = '\0';
1944                                         pbuf = timebuf;
1945                                         break;
1946 # if ENABLE_USERNAME_OR_HOMEDIR
1947                                 case 'w': /* current dir */
1948                                 case 'W': /* basename of cur dir */
1949                                         if (!cwd_buf) {
1950                                                 cwd_buf = xrealloc_getcwd_or_warn(NULL);
1951                                                 if (!cwd_buf)
1952                                                         cwd_buf = (char *)bb_msg_unknown;
1953                                                 else if (home_pwd_buf[0]) {
1954                                                         char *after_home_user;
1955
1956                                                         /* /home/user[/something] -> ~[/something] */
1957                                                         after_home_user = is_prefixed_with(cwd_buf, home_pwd_buf);
1958                                                         if (after_home_user
1959                                                          && (*after_home_user == '/' || *after_home_user == '\0')
1960                                                         ) {
1961                                                                 cwd_buf[0] = '~';
1962                                                                 overlapping_strcpy(cwd_buf + 1, after_home_user);
1963                                                         }
1964                                                 }
1965                                         }
1966                                         pbuf = cwd_buf;
1967                                         if (c == 'w')
1968                                                 break;
1969                                         cp = strrchr(pbuf, '/');
1970                                         if (cp)
1971                                                 pbuf = (char*)cp + 1;
1972                                         break;
1973 # endif
1974 // bb_process_escape_sequence does this now:
1975 //                              case 'e': case 'E':     /* \e \E = \033 */
1976 //                                      c = '\033';
1977 //                                      break;
1978                                 case 'x': case 'X': {
1979                                         char buf2[4];
1980                                         for (l = 0; l < 3;) {
1981                                                 unsigned h;
1982                                                 buf2[l++] = *prmt_ptr;
1983                                                 buf2[l] = '\0';
1984                                                 h = strtoul(buf2, &pbuf, 16);
1985                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1986                                                         buf2[--l] = '\0';
1987                                                         break;
1988                                                 }
1989                                                 prmt_ptr++;
1990                                         }
1991                                         c = (char)strtoul(buf2, NULL, 16);
1992                                         if (c == 0)
1993                                                 c = '?';
1994                                         pbuf = cbuf;
1995                                         break;
1996                                 }
1997                                 case '[': case ']':
1998                                         if (c == flg_not_length) {
1999                                                 /* Toggle '['/']' hex 5b/5d */
2000                                                 flg_not_length ^= 6;
2001                                                 continue;
2002                                         }
2003                                         break;
2004                                 } /* switch */
2005                         } /* if */
2006                 } /* if */
2007                 cbuf[0] = c;
2008                 {
2009                         int n = strlen(pbuf);
2010                         prmt_size += n;
2011                         if (c == '\n')
2012                                 cmdedit_prmt_len = 0;
2013                         else if (flg_not_length != ']') {
2014 #if 0 /*ENABLE_UNICODE_SUPPORT*/
2015 /* Won't work, pbuf is one BYTE string here instead of an one Unicode char string. */
2016 /* FIXME */
2017                                 cmdedit_prmt_len += unicode_strwidth(pbuf);
2018 #else
2019                                 cmdedit_prmt_len += n;
2020 #endif
2021                         }
2022                 }
2023                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_size+1), pbuf);
2024                 free(free_me);
2025         } /* while */
2026
2027 # if ENABLE_USERNAME_OR_HOMEDIR
2028         if (cwd_buf != (char *)bb_msg_unknown)
2029                 free(cwd_buf);
2030 # endif
2031         /* see comment (above this function) about multiline prompt redrawing */
2032         cmdedit_prompt = prompt_last_line = prmt_mem_ptr;
2033         prmt_ptr = strrchr(cmdedit_prompt, '\n');
2034         if (prmt_ptr)
2035                 prompt_last_line = prmt_ptr + 1;
2036         put_prompt();
2037 }
2038 #endif
2039
2040 #if ENABLE_FEATURE_EDITING_WINCH
2041 static void cmdedit_setwidth(void)
2042 {
2043         int new_y;
2044
2045         cmdedit_termw = get_terminal_width(STDIN_FILENO);
2046         /* new y for current cursor */
2047         new_y = (cursor + cmdedit_prmt_len) / cmdedit_termw;
2048         /* redraw */
2049         redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
2050 }
2051
2052 static void win_changed(int nsig UNUSED_PARAM)
2053 {
2054         if (S.ok_to_redraw) {
2055                 /* We are in read_key(), safe to redraw immediately */
2056                 int sv_errno = errno;
2057                 cmdedit_setwidth();
2058                 fflush_all();
2059                 errno = sv_errno;
2060         } else {
2061                 /* Signal main loop that redraw is necessary */
2062                 S.SIGWINCH_count++;
2063         }
2064 }
2065 #endif
2066
2067 static int lineedit_read_key(char *read_key_buffer, int timeout)
2068 {
2069         int64_t ic;
2070 #if ENABLE_UNICODE_SUPPORT
2071         char unicode_buf[MB_CUR_MAX + 1];
2072         int unicode_idx = 0;
2073 #endif
2074
2075         fflush_all();
2076         while (1) {
2077                 /* Wait for input. TIMEOUT = -1 makes read_key wait even
2078                  * on nonblocking stdin, TIMEOUT = 50 makes sure we won't
2079                  * insist on full MB_CUR_MAX buffer to declare input like
2080                  * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls".
2081                  *
2082                  * Note: read_key sets errno to 0 on success.
2083                  */
2084                 IF_FEATURE_EDITING_WINCH(S.ok_to_redraw = 1;)
2085                 ic = read_key(STDIN_FILENO, read_key_buffer, timeout);
2086                 IF_FEATURE_EDITING_WINCH(S.ok_to_redraw = 0;)
2087                 if (errno) {
2088 #if ENABLE_UNICODE_SUPPORT
2089                         if (errno == EAGAIN && unicode_idx != 0)
2090                                 goto pushback;
2091 #endif
2092                         break;
2093                 }
2094
2095 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2096                 if ((int32_t)ic == KEYCODE_CURSOR_POS
2097                  && S.sent_ESC_br6n
2098                 ) {
2099                         S.sent_ESC_br6n = 0;
2100                         if (cursor == 0) { /* otherwise it may be bogus */
2101                                 int col = ((ic >> 32) & 0x7fff) - 1;
2102                                 /*
2103                                  * Is col > cmdedit_prmt_len?
2104                                  * If yes (terminal says cursor is farther to the right
2105                                  * of where we think it should be),
2106                                  * the prompt wasn't printed starting at col 1,
2107                                  * there was additional text before it.
2108                                  */
2109                                 if ((int)(col - cmdedit_prmt_len) > 0) {
2110                                         /* Fix our understanding of current x position */
2111                                         cmdedit_x += (col - cmdedit_prmt_len);
2112                                         while (cmdedit_x >= cmdedit_termw) {
2113                                                 cmdedit_x -= cmdedit_termw;
2114                                                 cmdedit_y++;
2115                                         }
2116                                 }
2117                         }
2118                         continue;
2119                 }
2120 #endif
2121
2122 #if ENABLE_UNICODE_SUPPORT
2123                 if (unicode_status == UNICODE_ON) {
2124                         wchar_t wc;
2125
2126                         if ((int32_t)ic < 0) /* KEYCODE_xxx */
2127                                 break;
2128                         // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff...
2129
2130                         unicode_buf[unicode_idx++] = ic;
2131                         unicode_buf[unicode_idx] = '\0';
2132                         if (mbstowcs(&wc, unicode_buf, 1) != 1) {
2133                                 /* Not (yet?) a valid unicode char */
2134                                 if (unicode_idx < MB_CUR_MAX) {
2135                                         timeout = 50;
2136                                         continue;
2137                                 }
2138  pushback:
2139                                 /* Invalid sequence. Save all "bad bytes" except first */
2140                                 read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1);
2141 # if !ENABLE_UNICODE_PRESERVE_BROKEN
2142                                 ic = CONFIG_SUBST_WCHAR;
2143 # else
2144                                 ic = unicode_mark_raw_byte(unicode_buf[0]);
2145 # endif
2146                         } else {
2147                                 /* Valid unicode char, return its code */
2148                                 ic = wc;
2149                         }
2150                 }
2151 #endif
2152                 break;
2153         }
2154
2155         return ic;
2156 }
2157
2158 #if ENABLE_UNICODE_BIDI_SUPPORT
2159 static int isrtl_str(void)
2160 {
2161         int idx = cursor;
2162
2163         while (idx < command_len && unicode_bidi_is_neutral_wchar(command_ps[idx]))
2164                 idx++;
2165         return unicode_bidi_isrtl(command_ps[idx]);
2166 }
2167 #else
2168 # define isrtl_str() 0
2169 #endif
2170
2171 /* leave out the "vi-mode"-only case labels if vi editing isn't
2172  * configured. */
2173 #define vi_case(caselabel) IF_FEATURE_EDITING_VI(case caselabel)
2174
2175 /* convert uppercase ascii to equivalent control char, for readability */
2176 #undef CTRL
2177 #define CTRL(a) ((a) & ~0x40)
2178
2179 enum {
2180         VI_CMDMODE_BIT = 0x40000000,
2181         /* 0x80000000 bit flags KEYCODE_xxx */
2182 };
2183
2184 #if ENABLE_FEATURE_REVERSE_SEARCH
2185 /* Mimic readline Ctrl-R reverse history search.
2186  * When invoked, it shows the following prompt:
2187  * (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R]
2188  * and typing results in search being performed:
2189  * (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp]
2190  * Search is performed by looking at progressively older lines in history.
2191  * Ctrl-R again searches for the next match in history.
2192  * Backspace deletes last matched char.
2193  * Control keys exit search and return to normal editing (at current history line).
2194  */
2195 static int32_t reverse_i_search(int timeout)
2196 {
2197         char match_buf[128]; /* for user input */
2198         char read_key_buffer[KEYCODE_BUFFER_SIZE];
2199         const char *matched_history_line;
2200         const char *saved_prompt;
2201         unsigned saved_prmt_len;
2202         int32_t ic;
2203
2204         matched_history_line = NULL;
2205         read_key_buffer[0] = 0;
2206         match_buf[0] = '\0';
2207
2208         /* Save and replace the prompt */
2209         saved_prompt = prompt_last_line;
2210         saved_prmt_len = cmdedit_prmt_len;
2211         goto set_prompt;
2212
2213         while (1) {
2214                 int h;
2215                 unsigned match_buf_len = strlen(match_buf);
2216
2217 //FIXME: correct timeout? (i.e. count it down?)
2218                 ic = lineedit_read_key(read_key_buffer, timeout);
2219
2220                 switch (ic) {
2221                 case CTRL('R'): /* searching for the next match */
2222                         break;
2223
2224                 case '\b':
2225                 case '\x7f':
2226                         /* Backspace */
2227                         if (unicode_status == UNICODE_ON) {
2228                                 while (match_buf_len != 0) {
2229                                         uint8_t c = match_buf[--match_buf_len];
2230                                         if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */
2231                                                 break; /* yes */
2232                                 }
2233                         } else {
2234                                 if (match_buf_len != 0)
2235                                         match_buf_len--;
2236                         }
2237                         match_buf[match_buf_len] = '\0';
2238                         break;
2239
2240                 default:
2241                         if (ic < ' '
2242                          || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2243                          || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2244                         ) {
2245                                 goto ret;
2246                         }
2247
2248                         /* Append this char */
2249 #if ENABLE_UNICODE_SUPPORT
2250                         if (unicode_status == UNICODE_ON) {
2251                                 mbstate_t mbstate = { 0 };
2252                                 char buf[MB_CUR_MAX + 1];
2253                                 int len = wcrtomb(buf, ic, &mbstate);
2254                                 if (len > 0) {
2255                                         buf[len] = '\0';
2256                                         if (match_buf_len + len < sizeof(match_buf))
2257                                                 strcpy(match_buf + match_buf_len, buf);
2258                                 }
2259                         } else
2260 #endif
2261                         if (match_buf_len < sizeof(match_buf) - 1) {
2262                                 match_buf[match_buf_len] = ic;
2263                                 match_buf[match_buf_len + 1] = '\0';
2264                         }
2265                         break;
2266                 } /* switch (ic) */
2267
2268                 /* Search in history for match_buf */
2269                 h = state->cur_history;
2270                 if (ic == CTRL('R'))
2271                         h--;
2272                 while (h >= 0) {
2273                         if (state->history[h]) {
2274                                 char *match = strstr(state->history[h], match_buf);
2275                                 if (match) {
2276                                         state->cur_history = h;
2277                                         matched_history_line = state->history[h];
2278                                         command_len = load_string(matched_history_line);
2279                                         cursor = match - matched_history_line;
2280 //FIXME: cursor position for Unicode case
2281
2282                                         free((char*)prompt_last_line);
2283  set_prompt:
2284                                         prompt_last_line = xasprintf("(reverse-i-search)'%s': ", match_buf);
2285                                         cmdedit_prmt_len = unicode_strwidth(prompt_last_line);
2286                                         goto do_redraw;
2287                                 }
2288                         }
2289                         h--;
2290                 }
2291
2292                 /* Not found */
2293                 match_buf[match_buf_len] = '\0';
2294                 beep();
2295                 continue;
2296
2297  do_redraw:
2298                 redraw(cmdedit_y, command_len - cursor);
2299         } /* while (1) */
2300
2301  ret:
2302         if (matched_history_line)
2303                 command_len = load_string(matched_history_line);
2304
2305         free((char*)prompt_last_line);
2306         prompt_last_line = saved_prompt;
2307         cmdedit_prmt_len = saved_prmt_len;
2308         redraw(cmdedit_y, command_len - cursor);
2309
2310         return ic;
2311 }
2312 #endif
2313
2314 #if ENABLE_FEATURE_EDITING_WINCH
2315 static void sigaction2(int sig, struct sigaction *act)
2316 {
2317         // Grr... gcc 8.1.1:
2318         // "passing argument 3 to restrict-qualified parameter aliases with argument 2"
2319         // dance around that...
2320         struct sigaction *oact FIX_ALIASING;
2321         oact = act;
2322         sigaction(sig, act, oact);
2323 }
2324 #endif
2325
2326 /* maxsize must be >= 2.
2327  * Returns:
2328  * -1 on read errors or EOF, or on bare Ctrl-D,
2329  * 0  on ctrl-C (the line entered is still returned in 'command'),
2330  * (in both cases the cursor remains on the input line, '\n' is not printed)
2331  * >0 length of input string, including terminating '\n'
2332  */
2333 int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *command, int maxsize)
2334 {
2335         int len, n;
2336         int timeout;
2337 #if ENABLE_FEATURE_TAB_COMPLETION
2338         smallint lastWasTab = 0;
2339 #endif
2340         smallint break_out = 0;
2341 #if ENABLE_FEATURE_EDITING_VI
2342         smallint vi_cmdmode = 0;
2343 #endif
2344         struct termios initial_settings;
2345         struct termios new_settings;
2346         char read_key_buffer[KEYCODE_BUFFER_SIZE];
2347
2348         INIT_S();
2349
2350         n = get_termios_and_make_raw(STDIN_FILENO, &new_settings, &initial_settings, 0
2351                 | TERMIOS_CLEAR_ISIG /* turn off INTR (ctrl-C), QUIT, SUSP */
2352         );
2353         if (n != 0 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON) {
2354                 /* Happens when e.g. stty -echo was run before.
2355                  * But if ICANON is not set, we don't come here.
2356                  * (example: interactive python ^Z-backgrounded,
2357                  * tty is still in "raw mode").
2358                  */
2359                 parse_and_put_prompt(prompt);
2360                 fflush_all();
2361                 if (fgets(command, maxsize, stdin) == NULL)
2362                         len = -1; /* EOF or error */
2363                 else
2364                         len = strlen(command);
2365                 DEINIT_S();
2366                 return len;
2367         }
2368
2369         init_unicode();
2370
2371 // FIXME: audit & improve this
2372         if (maxsize > MAX_LINELEN)
2373                 maxsize = MAX_LINELEN;
2374         S.maxsize = maxsize;
2375
2376         timeout = -1;
2377         /* Make state->flags == 0 if st is NULL.
2378          * With zeroed flags, no other fields are ever referenced.
2379          */
2380         state = (line_input_t*) &const_int_0;
2381         if (st) {
2382                 state = st;
2383                 timeout = st->timeout;
2384         }
2385 #if MAX_HISTORY > 0
2386 # if ENABLE_FEATURE_EDITING_SAVEHISTORY
2387         if (state->hist_file)
2388                 if (state->cnt_history == 0)
2389                         load_history(state);
2390 # endif
2391         if (state->flags & DO_HISTORY)
2392                 state->cur_history = state->cnt_history;
2393 #endif
2394
2395         /* prepare before init handlers */
2396         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
2397         command_len = 0;
2398 #if ENABLE_UNICODE_SUPPORT
2399         command_ps = xzalloc(maxsize * sizeof(command_ps[0]));
2400 #else
2401         command_ps = command;
2402         command[0] = '\0';
2403 #endif
2404 #define command command_must_not_be_used
2405
2406         tcsetattr_stdin_TCSANOW(&new_settings);
2407
2408 #if ENABLE_USERNAME_OR_HOMEDIR
2409         {
2410                 struct passwd *entry;
2411
2412                 entry = getpwuid(geteuid());
2413                 if (entry) {
2414                         user_buf = xstrdup(entry->pw_name);
2415                         home_pwd_buf = xstrdup(entry->pw_dir);
2416                 }
2417         }
2418 #endif
2419
2420 #if 0
2421         for (i = 0; i <= state->max_history; i++)
2422                 bb_error_msg("history[%d]:'%s'", i, state->history[i]);
2423         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
2424 #endif
2425
2426         /* Get width (before printing prompt) */
2427         cmdedit_termw = get_terminal_width(STDIN_FILENO);
2428         /* Print out the command prompt, optionally ask where cursor is */
2429         parse_and_put_prompt(prompt);
2430         ask_terminal();
2431
2432 #if ENABLE_FEATURE_EDITING_WINCH
2433         /* Install window resize handler (NB: after *all* init is complete) */
2434         S.SIGWINCH_handler.sa_handler = win_changed;
2435         S.SIGWINCH_handler.sa_flags = SA_RESTART;
2436         sigaction2(SIGWINCH, &S.SIGWINCH_handler);
2437 #endif
2438         read_key_buffer[0] = 0;
2439         while (1) {
2440                 /*
2441                  * The emacs and vi modes share much of the code in the big
2442                  * command loop.  Commands entered when in vi's command mode
2443                  * (aka "escape mode") get an extra bit added to distinguish
2444                  * them - this keeps them from being self-inserted. This
2445                  * clutters the big switch a bit, but keeps all the code
2446                  * in one place.
2447                  */
2448                 int32_t ic, ic_raw;
2449 #if ENABLE_FEATURE_EDITING_WINCH
2450                 unsigned count;
2451
2452                 count = S.SIGWINCH_count;
2453                 if (S.SIGWINCH_saved != count) {
2454                         S.SIGWINCH_saved = count;
2455                         cmdedit_setwidth();
2456                 }
2457 #endif
2458                 ic = ic_raw = lineedit_read_key(read_key_buffer, timeout);
2459
2460 #if ENABLE_FEATURE_REVERSE_SEARCH
2461  again:
2462 #endif
2463 #if ENABLE_FEATURE_EDITING_VI
2464                 newdelflag = 1;
2465                 if (vi_cmdmode) {
2466                         /* btw, since KEYCODE_xxx are all < 0, this doesn't
2467                          * change ic if it contains one of them: */
2468                         ic |= VI_CMDMODE_BIT;
2469                 }
2470 #endif
2471
2472                 switch (ic) {
2473                 case '\n':
2474                 case '\r':
2475                 vi_case('\n'|VI_CMDMODE_BIT:)
2476                 vi_case('\r'|VI_CMDMODE_BIT:)
2477                         /* Enter */
2478                         goto_new_line();
2479                         break_out = 1;
2480                         break;
2481                 case CTRL('A'):
2482                 vi_case('0'|VI_CMDMODE_BIT:)
2483                         /* Control-a -- Beginning of line */
2484                         input_backward(cursor);
2485                         break;
2486                 case CTRL('B'):
2487                 vi_case('h'|VI_CMDMODE_BIT:)
2488                 vi_case('\b'|VI_CMDMODE_BIT:) /* ^H */
2489                 vi_case('\x7f'|VI_CMDMODE_BIT:) /* DEL */
2490                         input_backward(1); /* Move back one character */
2491                         break;
2492                 case CTRL('E'):
2493                 vi_case('$'|VI_CMDMODE_BIT:)
2494                         /* Control-e -- End of line */
2495                         put_till_end_and_adv_cursor();
2496                         break;
2497                 case CTRL('F'):
2498                 vi_case('l'|VI_CMDMODE_BIT:)
2499                 vi_case(' '|VI_CMDMODE_BIT:)
2500                         input_forward(); /* Move forward one character */
2501                         break;
2502                 case '\b':   /* ^H */
2503                 case '\x7f': /* DEL */
2504                         if (!isrtl_str())
2505                                 input_backspace();
2506                         else
2507                                 input_delete(0);
2508                         break;
2509                 case KEYCODE_DELETE:
2510                         if (!isrtl_str())
2511                                 input_delete(0);
2512                         else
2513                                 input_backspace();
2514                         break;
2515 #if ENABLE_FEATURE_TAB_COMPLETION
2516                 case '\t':
2517                         input_tab(&lastWasTab);
2518                         break;
2519 #endif
2520                 case CTRL('K'):
2521                         /* Control-k -- clear to end of line */
2522                         command_ps[cursor] = BB_NUL;
2523                         command_len = cursor;
2524                         printf(SEQ_CLEAR_TILL_END_OF_SCREEN);
2525                         break;
2526                 case CTRL('L'):
2527                 vi_case(CTRL('L')|VI_CMDMODE_BIT:)
2528                         /* Control-l -- clear screen */
2529                         /* cursor to top,left; clear to the end of screen */
2530                         printf(ESC"[H" ESC"[J");
2531                         draw_full(command_len - cursor);
2532                         break;
2533 #if MAX_HISTORY > 0
2534                 case CTRL('N'):
2535                 vi_case(CTRL('N')|VI_CMDMODE_BIT:)
2536                 vi_case('j'|VI_CMDMODE_BIT:)
2537                         /* Control-n -- Get next command in history */
2538                         if (get_next_history())
2539                                 goto rewrite_line;
2540                         break;
2541                 case CTRL('P'):
2542                 vi_case(CTRL('P')|VI_CMDMODE_BIT:)
2543                 vi_case('k'|VI_CMDMODE_BIT:)
2544                         /* Control-p -- Get previous command from history */
2545                         if (get_previous_history())
2546                                 goto rewrite_line;
2547                         break;
2548 #endif
2549                 case CTRL('U'):
2550                 vi_case(CTRL('U')|VI_CMDMODE_BIT:)
2551                         /* Control-U -- Clear line before cursor */
2552                         if (cursor) {
2553                                 command_len -= cursor;
2554                                 memmove(command_ps, command_ps + cursor,
2555                                         (command_len + 1) * sizeof(command_ps[0]));
2556                                 redraw(cmdedit_y, command_len);
2557                         }
2558                         break;
2559                 case CTRL('W'):
2560                 vi_case(CTRL('W')|VI_CMDMODE_BIT:)
2561                         /* Control-W -- Remove the last word */
2562                         while (cursor > 0 && BB_isspace(command_ps[cursor-1]))
2563                                 input_backspace();
2564                         while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
2565                                 input_backspace();
2566                         break;
2567                 case KEYCODE_ALT_D: {
2568                         /* Delete word forward */
2569                         int nc, sc = cursor;
2570                         ctrl_right();
2571                         nc = cursor - sc;
2572                         input_backward(nc);
2573                         while (--nc >= 0)
2574                                 input_delete(1);
2575                         break;
2576                 }
2577                 case KEYCODE_ALT_BACKSPACE: {
2578                         /* Delete word backward */
2579                         int sc = cursor;
2580                         ctrl_left();
2581                         while (sc-- > cursor)
2582                                 input_delete(1);
2583                         break;
2584                 }
2585 #if ENABLE_FEATURE_REVERSE_SEARCH
2586                 case CTRL('R'):
2587                         ic = ic_raw = reverse_i_search(timeout);
2588                         goto again;
2589 #endif
2590
2591 #if ENABLE_FEATURE_EDITING_VI
2592                 case 'i'|VI_CMDMODE_BIT:
2593                         vi_cmdmode = 0;
2594                         break;
2595                 case 'I'|VI_CMDMODE_BIT:
2596                         input_backward(cursor);
2597                         vi_cmdmode = 0;
2598                         break;
2599                 case 'a'|VI_CMDMODE_BIT:
2600                         input_forward();
2601                         vi_cmdmode = 0;
2602                         break;
2603                 case 'A'|VI_CMDMODE_BIT:
2604                         put_till_end_and_adv_cursor();
2605                         vi_cmdmode = 0;
2606                         break;
2607                 case 'x'|VI_CMDMODE_BIT:
2608                         input_delete(1);
2609                         break;
2610                 case 'X'|VI_CMDMODE_BIT:
2611                         if (cursor > 0) {
2612                                 input_backward(1);
2613                                 input_delete(1);
2614                         }
2615                         break;
2616                 case 'W'|VI_CMDMODE_BIT:
2617                         vi_Word_motion(1);
2618                         break;
2619                 case 'w'|VI_CMDMODE_BIT:
2620                         vi_word_motion(1);
2621                         break;
2622                 case 'E'|VI_CMDMODE_BIT:
2623                         vi_End_motion();
2624                         break;
2625                 case 'e'|VI_CMDMODE_BIT:
2626                         vi_end_motion();
2627                         break;
2628                 case 'B'|VI_CMDMODE_BIT:
2629                         vi_Back_motion();
2630                         break;
2631                 case 'b'|VI_CMDMODE_BIT:
2632                         vi_back_motion();
2633                         break;
2634                 case 'C'|VI_CMDMODE_BIT:
2635                         vi_cmdmode = 0;
2636                         /* fall through */
2637                 case 'D'|VI_CMDMODE_BIT:
2638                         goto clear_to_eol;
2639
2640                 case 'c'|VI_CMDMODE_BIT:
2641                         vi_cmdmode = 0;
2642                         /* fall through */
2643                 case 'd'|VI_CMDMODE_BIT: {
2644                         int nc, sc;
2645
2646                         ic = lineedit_read_key(read_key_buffer, timeout);
2647                         if (errno) /* error */
2648                                 goto return_error_indicator;
2649                         if (ic == ic_raw) { /* "cc", "dd" */
2650                                 input_backward(cursor);
2651                                 goto clear_to_eol;
2652                                 break;
2653                         }
2654
2655                         sc = cursor;
2656                         switch (ic) {
2657                         case 'w':
2658                         case 'W':
2659                         case 'e':
2660                         case 'E':
2661                                 switch (ic) {
2662                                 case 'w':   /* "dw", "cw" */
2663                                         vi_word_motion(vi_cmdmode);
2664                                         break;
2665                                 case 'W':   /* 'dW', 'cW' */
2666                                         vi_Word_motion(vi_cmdmode);
2667                                         break;
2668                                 case 'e':   /* 'de', 'ce' */
2669                                         vi_end_motion();
2670                                         input_forward();
2671                                         break;
2672                                 case 'E':   /* 'dE', 'cE' */
2673                                         vi_End_motion();
2674                                         input_forward();
2675                                         break;
2676                                 }
2677                                 nc = cursor;
2678                                 input_backward(cursor - sc);
2679                                 while (nc-- > cursor)
2680                                         input_delete(1);
2681                                 break;
2682                         case 'b':  /* "db", "cb" */
2683                         case 'B':  /* implemented as B */
2684                                 if (ic == 'b')
2685                                         vi_back_motion();
2686                                 else
2687                                         vi_Back_motion();
2688                                 while (sc-- > cursor)
2689                                         input_delete(1);
2690                                 break;
2691                         case ' ':  /* "d ", "c " */
2692                                 input_delete(1);
2693                                 break;
2694                         case '$':  /* "d$", "c$" */
2695  clear_to_eol:
2696                                 while (cursor < command_len)
2697                                         input_delete(1);
2698                                 break;
2699                         }
2700                         break;
2701                 }
2702                 case 'p'|VI_CMDMODE_BIT:
2703                         input_forward();
2704                         /* fallthrough */
2705                 case 'P'|VI_CMDMODE_BIT:
2706                         put();
2707                         break;
2708                 case 'r'|VI_CMDMODE_BIT:
2709 //FIXME: unicode case?
2710                         ic = lineedit_read_key(read_key_buffer, timeout);
2711                         if (errno) /* error */
2712                                 goto return_error_indicator;
2713                         if (ic < ' ' || ic > 255) {
2714                                 beep();
2715                         } else {
2716                                 command_ps[cursor] = ic;
2717                                 bb_putchar(ic);
2718                                 bb_putchar('\b');
2719                         }
2720                         break;
2721                 case '\x1b': /* ESC */
2722                         if (state->flags & VI_MODE) {
2723                                 /* insert mode --> command mode */
2724                                 vi_cmdmode = 1;
2725                                 input_backward(1);
2726                         }
2727                         break;
2728 #endif /* FEATURE_COMMAND_EDITING_VI */
2729
2730 #if MAX_HISTORY > 0
2731                 case KEYCODE_UP:
2732                         if (get_previous_history())
2733                                 goto rewrite_line;
2734                         beep();
2735                         break;
2736                 case KEYCODE_DOWN:
2737                         if (!get_next_history())
2738                                 break;
2739  rewrite_line:
2740                         /* Rewrite the line with the selected history item */
2741                         /* change command */
2742                         command_len = load_string(state->history[state->cur_history] ?
2743                                         state->history[state->cur_history] : "");
2744                         /* redraw and go to eol (bol, in vi) */
2745                         redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
2746                         break;
2747 #endif
2748                 case KEYCODE_RIGHT:
2749                         input_forward();
2750                         break;
2751                 case KEYCODE_LEFT:
2752                         input_backward(1);
2753                         break;
2754                 case KEYCODE_CTRL_LEFT:
2755                 case KEYCODE_ALT_LEFT: /* bash doesn't do it */
2756                         ctrl_left();
2757                         break;
2758                 case KEYCODE_CTRL_RIGHT:
2759                 case KEYCODE_ALT_RIGHT: /* bash doesn't do it */
2760                         ctrl_right();
2761                         break;
2762                 case KEYCODE_HOME:
2763                         input_backward(cursor);
2764                         break;
2765                 case KEYCODE_END:
2766                         put_till_end_and_adv_cursor();
2767                         break;
2768
2769                 default:
2770                         if (initial_settings.c_cc[VINTR] != 0
2771                          && ic_raw == initial_settings.c_cc[VINTR]
2772                         ) {
2773                                 /* Ctrl-C (usually) - stop gathering input */
2774                                 command_len = 0;
2775                                 break_out = -1; /* "do not append '\n'" */
2776                                 break;
2777                         }
2778                         if (initial_settings.c_cc[VEOF] != 0
2779                          && ic_raw == initial_settings.c_cc[VEOF]
2780                         ) {
2781                                 /* Ctrl-D (usually) - delete one character,
2782                                  * or exit if len=0 and no chars to delete */
2783                                 if (command_len == 0) {
2784                                         errno = 0;
2785
2786                 case -1: /* error (e.g. EIO when tty is destroyed) */
2787  IF_FEATURE_EDITING_VI(return_error_indicator:)
2788                                         break_out = command_len = -1;
2789                                         break;
2790                                 }
2791                                 input_delete(0);
2792                                 break;
2793                         }
2794 //                      /* Control-V -- force insert of next char */
2795 //                      if (c == CTRL('V')) {
2796 //                              if (safe_read(STDIN_FILENO, &c, 1) < 1)
2797 //                                      goto return_error_indicator;
2798 //                              if (c == 0) {
2799 //                                      beep();
2800 //                                      break;
2801 //                              }
2802 //                      }
2803                         if (ic < ' '
2804                          || (!ENABLE_UNICODE_SUPPORT && ic >= 256)
2805                          || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT)
2806                         ) {
2807                                 /* If VI_CMDMODE_BIT is set, ic is >= 256
2808                                  * and vi mode ignores unexpected chars.
2809                                  * Otherwise, we are here if ic is a
2810                                  * control char or an unhandled ESC sequence,
2811                                  * which is also ignored.
2812                                  */
2813                                 break;
2814                         }
2815                         if ((int)command_len >= (maxsize - 2)) {
2816                                 /* Not enough space for the char and EOL */
2817                                 break;
2818                         }
2819
2820                         command_len++;
2821                         if (cursor == (command_len - 1)) {
2822                                 /* We are at the end, append */
2823                                 command_ps[cursor] = ic;
2824                                 command_ps[cursor + 1] = BB_NUL;
2825                                 put_cur_glyph_and_inc_cursor();
2826                                 if (unicode_bidi_isrtl(ic))
2827                                         input_backward(1);
2828                         } else {
2829                                 /* In the middle, insert */
2830                                 int sc = cursor;
2831
2832                                 memmove(command_ps + sc + 1, command_ps + sc,
2833                                         (command_len - sc) * sizeof(command_ps[0]));
2834                                 command_ps[sc] = ic;
2835                                 /* is right-to-left char, or neutral one (e.g. comma) was just added to rtl text? */
2836                                 if (!isrtl_str())
2837                                         sc++; /* no */
2838                                 put_till_end_and_adv_cursor();
2839                                 /* to prev x pos + 1 */
2840                                 input_backward(cursor - sc);
2841                         }
2842                         break;
2843                 } /* switch (ic) */
2844
2845                 if (break_out)
2846                         break;
2847
2848 #if ENABLE_FEATURE_TAB_COMPLETION
2849                 if (ic_raw != '\t')
2850                         lastWasTab = 0;
2851 #endif
2852         } /* while (1) */
2853
2854 #if ENABLE_FEATURE_EDITING_ASK_TERMINAL
2855         if (S.sent_ESC_br6n) {
2856                 /* "sleep 1; busybox ash" + hold [Enter] to trigger.
2857                  * We sent "ESC [ 6 n", but got '\n' first, and
2858                  * KEYCODE_CURSOR_POS response is now buffered from terminal.
2859                  * It's bad already and not much can be done with it
2860                  * (it _will_ be visible for the next process to read stdin),
2861                  * but without this delay it even shows up on the screen
2862                  * as garbage because we restore echo settings with tcsetattr
2863                  * before it comes in. UGLY!
2864                  */
2865                 usleep(20*1000);
2866         }
2867 #endif
2868
2869 /* End of bug-catching "command_must_not_be_used" trick */
2870 #undef command
2871
2872 #if ENABLE_UNICODE_SUPPORT
2873         command[0] = '\0';
2874         if (command_len > 0)
2875                 command_len = save_string(command, maxsize - 1);
2876         free(command_ps);
2877 #endif
2878
2879         if (command_len > 0) {
2880                 remember_in_history(command);
2881         }
2882
2883         if (break_out > 0) {
2884                 command[command_len++] = '\n';
2885                 command[command_len] = '\0';
2886         }
2887
2888 #if ENABLE_FEATURE_TAB_COMPLETION
2889         free_tab_completion_data();
2890 #endif
2891
2892         /* restore initial_settings */
2893         tcsetattr_stdin_TCSANOW(&initial_settings);
2894 #if ENABLE_FEATURE_EDITING_WINCH
2895         /* restore SIGWINCH handler */
2896         sigaction_set(SIGWINCH, &S.SIGWINCH_handler);
2897 #endif
2898         fflush_all();
2899
2900         len = command_len;
2901         DEINIT_S();
2902
2903         return len; /* can't return command_len, DEINIT_S() destroys it */
2904 }
2905
2906 #else  /* !FEATURE_EDITING */
2907
2908 #undef read_line_input
2909 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
2910 {
2911         fputs(prompt, stdout);
2912         fflush_all();
2913         if (!fgets(command, maxsize, stdin))
2914                 return -1;
2915         return strlen(command);
2916 }
2917
2918 #endif  /* !FEATURE_EDITING */
2919
2920
2921 /*
2922  * Testing
2923  */
2924
2925 #ifdef TEST
2926
2927 #include <locale.h>
2928
2929 const char *applet_name = "debug stuff usage";
2930
2931 int main(int argc, char **argv)
2932 {
2933         char buff[MAX_LINELEN];
2934         char *prompt =
2935 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
2936                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
2937                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
2938                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[m\\]";
2939 #else
2940                 "% ";
2941 #endif
2942
2943         while (1) {
2944                 int l;
2945                 l = read_line_input(prompt, buff);
2946                 if (l <= 0 || buff[l-1] != '\n')
2947                         break;
2948                 buff[l-1] = '\0';
2949                 printf("*** read_line_input() returned line =%s=\n", buff);
2950         }
2951         printf("*** read_line_input() detect ^D\n");
2952         return 0;
2953 }
2954
2955 #endif  /* TEST */