libbb/lineedit.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Termios command line History and Editing.
   4  *
   5  * Copyright (c) 1986-2003 may safely be consumed by a BSD or GPL license.
   6  * Written by:   Vladimir Oleynik <dzo@simtreas.ru>
   7  *
   8  * Used ideas:
   9  *      Adam Rogoyski    <rogoyski@cs.utexas.edu>
  10  *      Dave Cinege      <dcinege@psychosis.com>
  11  *      Jakub Jelinek (c) 1995
  12  *      Erik Andersen    <andersen@codepoet.org> (Majorly adjusted for busybox)
  13  *
  14  * This code is 'as is' with no warranty.
  15  */
  16
  17 /*
  18    Usage and known bugs:
  19    Terminal key codes are not extensive, and more will probably
  20    need to be added. This version was created on Debian GNU/Linux 2.x.
  21    Delete, Backspace, Home, End, and the arrow keys were tested
  22    to work in an Xterm and console. Ctrl-A also works as Home.
  23    Ctrl-E also works as End.
  24
  25    Small bugs (simple effect):
  26    - not true viewing if terminal size (x*y symbols) less
  27      size (prompt + editor's line + 2 symbols)
  28    - not true viewing if length prompt less terminal width
  29  */
  30
  31 #include "libbb.h"
  32
  33
  34 /* FIXME: obsolete CONFIG item? */
  35 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  36
  37
  38 #ifdef TEST
  39
  40 #define ENABLE_FEATURE_EDITING 0
  41 #define ENABLE_FEATURE_TAB_COMPLETION 0
  42 #define ENABLE_FEATURE_USERNAME_COMPLETION 0
  43 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  44
  45 #endif  /* TEST */
  46
  47
  48 /* Entire file (except TESTing part) sits inside this #if */
  49 #if ENABLE_FEATURE_EDITING
  50
  51 #if ENABLE_LOCALE_SUPPORT
  52 #define Isprint(c) isprint(c)
  53 #else
  54 #define Isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233'))
  55 #endif
  56
  57 #define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
  58         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  59 #define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
  60 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  61 #undef USE_FEATURE_GETUSERNAME_AND_HOMEDIR
  62 #define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
  63 #endif
  64
  65 enum {
  66         /* We use int16_t for positions, need to limit line len */
  67         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
  68                       ? CONFIG_FEATURE_EDITING_MAX_LEN
  69                       : 0x7ff0
  70 };
  71
  72 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  73 static const char null_str[] ALIGN1 = "";
  74 #endif
  75
  76 /* We try to minimize both static and stack usage. */
  77 struct lineedit_statics {
  78         line_input_t *state;
  79
  80         volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
  81         sighandler_t previous_SIGWINCH_handler;
  82
  83
  84         int cmdedit_x;           /* real x terminal position */
  85         int cmdedit_y;           /* pseudoreal y terminal position */
  86         int cmdedit_prmt_len;    /* length of prompt (without colors etc) */
  87
  88         unsigned cursor;
  89         unsigned command_len;
  90         char *command_ps;
  91
  92         const char *cmdedit_prompt;
  93 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
  94         int num_ok_lines; /* = 1; */
  95 #endif
  96
  97 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  98         char *user_buf;
  99         char *home_pwd_buf; /* = (char*)null_str; */
 100 #endif
 101
 102 #if ENABLE_FEATURE_TAB_COMPLETION
 103         char **matches;
 104         unsigned num_matches;
 105 #endif
 106
 107 #if ENABLE_FEATURE_EDITING_VI
 108 #define DELBUFSIZ 128
 109         char *delptr;
 110         smallint newdelflag;     /* whether delbuf should be reused yet */
 111         char delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 112 #endif
 113
 114         /* Formerly these were big buffers on stack: */
 115 #if ENABLE_FEATURE_TAB_COMPLETION
 116         char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
 117         char input_tab__matchBuf[MAX_LINELEN];
 118         int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
 119         int16_t find_match__pos_buf[MAX_LINELEN + 1];
 120 #endif
 121 };
 122
 123 /* See lineedit_ptr_hack.c */
 124 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 125
 126 #define S (*lineedit_ptr_to_statics)
 127 #define state            (S.state           )
 128 #define cmdedit_termw    (S.cmdedit_termw   )
 129 #define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
 130 #define cmdedit_x        (S.cmdedit_x       )
 131 #define cmdedit_y        (S.cmdedit_y       )
 132 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 133 #define cursor           (S.cursor          )
 134 #define command_len      (S.command_len     )
 135 #define command_ps       (S.command_ps      )
 136 #define cmdedit_prompt   (S.cmdedit_prompt  )
 137 #define num_ok_lines     (S.num_ok_lines    )
 138 #define user_buf         (S.user_buf        )
 139 #define home_pwd_buf     (S.home_pwd_buf    )
 140 #define matches          (S.matches         )
 141 #define num_matches      (S.num_matches     )
 142 #define delptr           (S.delptr          )
 143 #define newdelflag       (S.newdelflag      )
 144 #define delbuf           (S.delbuf          )
 145
 146 #define INIT_S() do { \
 147         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 148         barrier(); \
 149         cmdedit_termw = 80; \
 150         USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
 151         USE_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 152 } while (0)
 153 static void deinit_S(void)
 154 {
 155 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 156         /* This one is allocated only if FANCY_PROMPT is on
 157          * (otherwise it points to verbatim prompt (NOT malloced) */
 158         free((char*)cmdedit_prompt);
 159 #endif
 160 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 161         free(user_buf);
 162         if (home_pwd_buf != null_str)
 163                 free(home_pwd_buf);
 164 #endif
 165         free(lineedit_ptr_to_statics);
 166 }
 167 #define DEINIT_S() deinit_S()
 168
 169
 170 /* Put 'command_ps[cursor]', cursor++.
 171  * Advance cursor on screen. If we reached right margin, scroll text up
 172  * and remove terminal margin effect by printing 'next_char' */
 173 #define HACK_FOR_WRONG_WIDTH 1
 174 #if HACK_FOR_WRONG_WIDTH
 175 static void cmdedit_set_out_char(void)
 176 #define cmdedit_set_out_char(next_char) cmdedit_set_out_char()
 177 #else
 178 static void cmdedit_set_out_char(int next_char)
 179 #endif
 180 {
 181         int c = (unsigned char)command_ps[cursor];
 182
 183         if (c == '\0') {
 184                 /* erase character after end of input string */
 185                 c = ' ';
 186         }
 187 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 188         /* Display non-printable characters in reverse */
 189         if (!Isprint(c)) {
 190                 if (c >= 128)
 191                         c -= 128;
 192                 if (c < ' ')
 193                         c += '@';
 194                 if (c == 127)
 195                         c = '?';
 196                 printf("\033[7m%c\033[0m", c);
 197         } else
 198 #endif
 199         {
 200                 bb_putchar(c);
 201         }
 202         if (++cmdedit_x >= cmdedit_termw) {
 203                 /* terminal is scrolled down */
 204                 cmdedit_y++;
 205                 cmdedit_x = 0;
 206 #if HACK_FOR_WRONG_WIDTH
 207                 /* This works better if our idea of term width is wrong
 208                  * and it is actually wider (often happens on serial lines).
 209                  * Printing CR,LF *forces* cursor to next line.
 210                  * OTOH if terminal width is correct AND terminal does NOT
 211                  * have automargin (IOW: it is moving cursor to next line
 212                  * by itself (which is wrong for VT-10x terminals)),
 213                  * this will break things: there will be one extra empty line */
 214                 puts("\r"); /* + implicit '\n' */
 215 #else
 216                 /* Works ok only if cmdedit_termw is correct */
 217                 /* destroy "(auto)margin" */
 218                 bb_putchar(next_char);
 219                 bb_putchar('\b');
 220 #endif
 221         }
 222 // Huh? What if command_ps[cursor] == '\0' (we are at the end already?)
 223         cursor++;
 224 }
 225
 226 /* Move to end of line (by printing all chars till the end) */
 227 static void input_end(void)
 228 {
 229         while (cursor < command_len)
 230                 cmdedit_set_out_char(' ');
 231 }
 232
 233 /* Go to the next line */
 234 static void goto_new_line(void)
 235 {
 236         input_end();
 237         if (cmdedit_x)
 238                 bb_putchar('\n');
 239 }
 240
 241
 242 static void out1str(const char *s)
 243 {
 244         if (s)
 245                 fputs(s, stdout);
 246 }
 247
 248 static void beep(void)
 249 {
 250         bb_putchar('\007');
 251 }
 252
 253 /* Move back one character */
 254 /* (optimized for slow terminals) */
 255 static void input_backward(unsigned num)
 256 {
 257         int count_y;
 258
 259         if (num > cursor)
 260                 num = cursor;
 261         if (!num)
 262                 return;
 263         cursor -= num;
 264
 265         if ((unsigned)cmdedit_x >= num) {
 266                 cmdedit_x -= num;
 267                 if (num <= 4) {
 268                         /* This is longer by 5 bytes on x86.
 269                          * Also gets mysteriously
 270                          * miscompiled for some ARM users.
 271                          * printf(("\b\b\b\b" + 4) - num);
 272                          * return;
 273                          */
 274                         do {
 275                                 bb_putchar('\b');
 276                         } while (--num);
 277                         return;
 278                 }
 279                 printf("\033[%uD", num);
 280                 return;
 281         }
 282
 283         /* Need to go one or more lines up */
 284         num -= cmdedit_x;
 285         count_y = 1 + (num / cmdedit_termw);
 286         cmdedit_y -= count_y;
 287         cmdedit_x = cmdedit_termw * count_y - num;
 288         /* go to 1st column; go up; go to correct column */
 289         printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
 290 }
 291
 292 static void put_prompt(void)
 293 {
 294         out1str(cmdedit_prompt);
 295         cmdedit_x = cmdedit_prmt_len;
 296         cursor = 0;
 297 // Huh? what if cmdedit_prmt_len >= width?
 298         cmdedit_y = 0;                  /* new quasireal y */
 299 }
 300
 301 /* draw prompt, editor line, and clear tail */
 302 static void redraw(int y, int back_cursor)
 303 {
 304         if (y > 0)                              /* up to start y */
 305                 printf("\033[%dA", y);
 306         bb_putchar('\r');
 307         put_prompt();
 308         input_end();                            /* rewrite */
 309         printf("\033[J");                       /* erase after cursor */
 310         input_backward(back_cursor);
 311 }
 312
 313 /* Delete the char in front of the cursor, optionally saving it
 314  * for later putback */
 315 #if !ENABLE_FEATURE_EDITING_VI
 316 static void input_delete(void)
 317 #define input_delete(save) input_delete()
 318 #else
 319 static void input_delete(int save)
 320 #endif
 321 {
 322         int j = cursor;
 323
 324         if (j == (int)command_len)
 325                 return;
 326
 327 #if ENABLE_FEATURE_EDITING_VI
 328         if (save) {
 329                 if (newdelflag) {
 330                         delptr = delbuf;
 331                         newdelflag = 0;
 332                 }
 333                 if ((delptr - delbuf) < DELBUFSIZ)
 334                         *delptr++ = command_ps[j];
 335         }
 336 #endif
 337
 338         strcpy(command_ps + j, command_ps + j + 1);
 339         command_len--;
 340         input_end();                    /* rewrite new line */
 341         cmdedit_set_out_char(' ');      /* erase char */
 342         input_backward(cursor - j);     /* back to old pos cursor */
 343 }
 344
 345 #if ENABLE_FEATURE_EDITING_VI
 346 static void put(void)
 347 {
 348         int ocursor;
 349         int j = delptr - delbuf;
 350
 351         if (j == 0)
 352                 return;
 353         ocursor = cursor;
 354         /* open hole and then fill it */
 355         memmove(command_ps + cursor + j, command_ps + cursor, command_len - cursor + 1);
 356         strncpy(command_ps + cursor, delbuf, j);
 357         command_len += j;
 358         input_end();                    /* rewrite new line */
 359         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 360 }
 361 #endif
 362
 363 /* Delete the char in back of the cursor */
 364 static void input_backspace(void)
 365 {
 366         if (cursor > 0) {
 367                 input_backward(1);
 368                 input_delete(0);
 369         }
 370 }
 371
 372 /* Move forward one character */
 373 static void input_forward(void)
 374 {
 375         if (cursor < command_len)
 376                 cmdedit_set_out_char(command_ps[cursor + 1]);
 377 }
 378
 379 #if ENABLE_FEATURE_TAB_COMPLETION
 380
 381 static void free_tab_completion_data(void)
 382 {
 383         if (matches) {
 384                 while (num_matches)
 385                         free(matches[--num_matches]);
 386                 free(matches);
 387                 matches = NULL;
 388         }
 389 }
 390
 391 static void add_match(char *matched)
 392 {
 393         int nm = num_matches;
 394         int nm1 = nm + 1;
 395
 396         matches = xrealloc(matches, nm1 * sizeof(char *));
 397         matches[nm] = matched;
 398         num_matches++;
 399 }
 400
 401 #if ENABLE_FEATURE_USERNAME_COMPLETION
 402 static void username_tab_completion(char *ud, char *with_shash_flg)
 403 {
 404         struct passwd *entry;
 405         int userlen;
 406
 407         ud++;                           /* ~user/... to user/... */
 408         userlen = strlen(ud);
 409
 410         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 411                 char *sav_ud = ud - 1;
 412                 char *home = NULL;
 413
 414                 if (*ud == '/') {       /* "~/..."     */
 415                         home = home_pwd_buf;
 416                 } else {
 417                         /* "~user/..." */
 418                         char *temp;
 419                         temp = strchr(ud, '/');
 420                         *temp = '\0';           /* ~user\0 */
 421                         entry = getpwnam(ud);
 422                         *temp = '/';            /* restore ~user/... */
 423                         ud = temp;
 424                         if (entry)
 425                                 home = entry->pw_dir;
 426                 }
 427                 if (home) {
 428                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 429                                 /* /home/user/... */
 430                                 sprintf(sav_ud, "%s%s", home, ud);
 431                         }
 432                 }
 433         } else {
 434                 /* "~[^/]*" */
 435                 /* Using _r function to avoid pulling in static buffers */
 436                 char line_buff[256];
 437                 struct passwd pwd;
 438                 struct passwd *result;
 439
 440                 setpwent();
 441                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 442                         /* Null usernames should result in all users as possible completions. */
 443                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 444                                 add_match(xasprintf("~%s/", pwd.pw_name));
 445                         }
 446                 }
 447                 endpwent();
 448         }
 449 }
 450 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 451
 452 enum {
 453         FIND_EXE_ONLY = 0,
 454         FIND_DIR_ONLY = 1,
 455         FIND_FILE_ONLY = 2,
 456 };
 457
 458 static int path_parse(char ***p, int flags)
 459 {
 460         int npth;
 461         const char *pth;
 462         char *tmp;
 463         char **res;
 464
 465         /* if not setenv PATH variable, to search cur dir "." */
 466         if (flags != FIND_EXE_ONLY)
 467                 return 1;
 468
 469         if (state->flags & WITH_PATH_LOOKUP)
 470                 pth = state->path_lookup;
 471         else
 472                 pth = getenv("PATH");
 473         /* PATH=<empty> or PATH=:<empty> */
 474         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 475                 return 1;
 476
 477         tmp = (char*)pth;
 478         npth = 1; /* path component count */
 479         while (1) {
 480                 tmp = strchr(tmp, ':');
 481                 if (!tmp)
 482                         break;
 483                 if (*++tmp == '\0')
 484                         break;  /* :<empty> */
 485                 npth++;
 486         }
 487
 488         res = xmalloc(npth * sizeof(char*));
 489         res[0] = tmp = xstrdup(pth);
 490         npth = 1;
 491         while (1) {
 492                 tmp = strchr(tmp, ':');
 493                 if (!tmp)
 494                         break;
 495                 *tmp++ = '\0'; /* ':' -> '\0' */
 496                 if (*tmp == '\0')
 497                         break; /* :<empty> */
 498                 res[npth++] = tmp;
 499         }
 500         *p = res;
 501         return npth;
 502 }
 503
 504 static void exe_n_cwd_tab_completion(char *command, int type)
 505 {
 506         DIR *dir;
 507         struct dirent *next;
 508         struct stat st;
 509         char *path1[1];
 510         char **paths = path1;
 511         int npaths;
 512         int i;
 513         char *found;
 514         char *pfind = strrchr(command, '/');
 515 /*      char dirbuf[MAX_LINELEN]; */
 516 #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
 517
 518         npaths = 1;
 519         path1[0] = (char*)".";
 520
 521         if (pfind == NULL) {
 522                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 523                 npaths = path_parse(&paths, type);
 524                 pfind = command;
 525         } else {
 526                 /* dirbuf = ".../.../.../" */
 527                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 528 #if ENABLE_FEATURE_USERNAME_COMPLETION
 529                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 530                         username_tab_completion(dirbuf, dirbuf);
 531 #endif
 532                 paths[0] = dirbuf;
 533                 /* point to 'l' in "..../last_component" */
 534                 pfind++;
 535         }
 536
 537         for (i = 0; i < npaths; i++) {
 538                 dir = opendir(paths[i]);
 539                 if (!dir)
 540                         continue; /* don't print an error */
 541
 542                 while ((next = readdir(dir)) != NULL) {
 543                         int len1;
 544                         const char *str_found = next->d_name;
 545
 546                         /* matched? */
 547                         if (strncmp(str_found, pfind, strlen(pfind)))
 548                                 continue;
 549                         /* not see .name without .match */
 550                         if (*str_found == '.' && *pfind == '\0') {
 551                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 552                                         continue;
 553                                 str_found = ""; /* only "/" */
 554                         }
 555                         found = concat_path_file(paths[i], str_found);
 556                         /* hmm, remove in progress? */
 557                         /* NB: stat() first so that we see is it a directory;
 558                          * but if that fails, use lstat() so that
 559                          * we still match dangling links */
 560                         if (stat(found, &st) && lstat(found, &st))
 561                                 goto cont;
 562                         /* find with dirs? */
 563                         if (paths[i] != dirbuf)
 564                                 strcpy(found, next->d_name); /* only name */
 565
 566                         len1 = strlen(found);
 567                         found = xrealloc(found, len1 + 2);
 568                         found[len1] = '\0';
 569                         found[len1+1] = '\0';
 570
 571                         if (S_ISDIR(st.st_mode)) {
 572                                 /* name is a directory */
 573                                 if (found[len1-1] != '/') {
 574                                         found[len1] = '/';
 575                                 }
 576                         } else {
 577                                 /* not put found file if search only dirs for cd */
 578                                 if (type == FIND_DIR_ONLY)
 579                                         goto cont;
 580                         }
 581                         /* Add it to the list */
 582                         add_match(found);
 583                         continue;
 584  cont:
 585                         free(found);
 586                 }
 587                 closedir(dir);
 588         }
 589         if (paths != path1) {
 590                 free(paths[0]); /* allocated memory is only in first member */
 591                 free(paths);
 592         }
 593 #undef dirbuf
 594 }
 595
 596 #define QUOT (UCHAR_MAX+1)
 597
 598 #define collapse_pos(is, in) do { \
 599         memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
 600         memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
 601 } while (0)
 602
 603 static int find_match(char *matchBuf, int *len_with_quotes)
 604 {
 605         int i, j;
 606         int command_mode;
 607         int c, c2;
 608 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 609 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 610 #define int_buf (S.find_match__int_buf)
 611 #define pos_buf (S.find_match__pos_buf)
 612
 613         /* set to integer dimension characters and own positions */
 614         for (i = 0;; i++) {
 615                 int_buf[i] = (unsigned char)matchBuf[i];
 616                 if (int_buf[i] == 0) {
 617                         pos_buf[i] = -1;        /* indicator end line */
 618                         break;
 619                 }
 620                 pos_buf[i] = i;
 621         }
 622
 623         /* mask \+symbol and convert '\t' to ' ' */
 624         for (i = j = 0; matchBuf[i]; i++, j++)
 625                 if (matchBuf[i] == '\\') {
 626                         collapse_pos(j, j + 1);
 627                         int_buf[j] |= QUOT;
 628                         i++;
 629 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 630                         if (matchBuf[i] == '\t')        /* algorithm equivalent */
 631                                 int_buf[j] = ' ' | QUOT;
 632 #endif
 633                 }
 634 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 635                 else if (matchBuf[i] == '\t')
 636                         int_buf[j] = ' ';
 637 #endif
 638
 639         /* mask "symbols" or 'symbols' */
 640         c2 = 0;
 641         for (i = 0; int_buf[i]; i++) {
 642                 c = int_buf[i];
 643                 if (c == '\'' || c == '"') {
 644                         if (c2 == 0)
 645                                 c2 = c;
 646                         else {
 647                                 if (c == c2)
 648                                         c2 = 0;
 649                                 else
 650                                         int_buf[i] |= QUOT;
 651                         }
 652                 } else if (c2 != 0 && c != '$')
 653                         int_buf[i] |= QUOT;
 654         }
 655
 656         /* skip commands with arguments if line has commands delimiters */
 657         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 658         for (i = 0; int_buf[i]; i++) {
 659                 c = int_buf[i];
 660                 c2 = int_buf[i + 1];
 661                 j = i ? int_buf[i - 1] : -1;
 662                 command_mode = 0;
 663                 if (c == ';' || c == '&' || c == '|') {
 664                         command_mode = 1 + (c == c2);
 665                         if (c == '&') {
 666                                 if (j == '>' || j == '<')
 667                                         command_mode = 0;
 668                         } else if (c == '|' && j == '>')
 669                                 command_mode = 0;
 670                 }
 671                 if (command_mode) {
 672                         collapse_pos(0, i + command_mode);
 673                         i = -1;                         /* hack incremet */
 674                 }
 675         }
 676         /* collapse `command...` */
 677         for (i = 0; int_buf[i]; i++)
 678                 if (int_buf[i] == '`') {
 679                         for (j = i + 1; int_buf[j]; j++)
 680                                 if (int_buf[j] == '`') {
 681                                         collapse_pos(i, j + 1);
 682                                         j = 0;
 683                                         break;
 684                                 }
 685                         if (j) {
 686                                 /* not found close ` - command mode, collapse all previous */
 687                                 collapse_pos(0, i + 1);
 688                                 break;
 689                         } else
 690                                 i--;                    /* hack incremet */
 691                 }
 692
 693         /* collapse (command...(command...)...) or {command...{command...}...} */
 694         c = 0;                                          /* "recursive" level */
 695         c2 = 0;
 696         for (i = 0; int_buf[i]; i++)
 697                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 698                         if (int_buf[i] == '(')
 699                                 c++;
 700                         else
 701                                 c2++;
 702                         collapse_pos(0, i + 1);
 703                         i = -1;                         /* hack incremet */
 704                 }
 705         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++)
 706                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 707                         if (int_buf[i] == ')')
 708                                 c--;
 709                         else
 710                                 c2--;
 711                         collapse_pos(0, i + 1);
 712                         i = -1;                         /* hack incremet */
 713                 }
 714
 715         /* skip first not quote space */
 716         for (i = 0; int_buf[i]; i++)
 717                 if (int_buf[i] != ' ')
 718                         break;
 719         if (i)
 720                 collapse_pos(0, i);
 721
 722         /* set find mode for completion */
 723         command_mode = FIND_EXE_ONLY;
 724         for (i = 0; int_buf[i]; i++)
 725                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 726                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 727                          && matchBuf[pos_buf[0]] == 'c'
 728                          && matchBuf[pos_buf[1]] == 'd'
 729                         ) {
 730                                 command_mode = FIND_DIR_ONLY;
 731                         } else {
 732                                 command_mode = FIND_FILE_ONLY;
 733                                 break;
 734                         }
 735                 }
 736         for (i = 0; int_buf[i]; i++)
 737                 /* "strlen" */;
 738         /* find last word */
 739         for (--i; i >= 0; i--) {
 740                 c = int_buf[i];
 741                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 742                         collapse_pos(0, i + 1);
 743                         break;
 744                 }
 745         }
 746         /* skip first not quoted '\'' or '"' */
 747         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 748                 /*skip*/;
 749         /* collapse quote or unquote // or /~ */
 750         while ((int_buf[i] & ~QUOT) == '/'
 751          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 752         ) {
 753                 i++;
 754         }
 755
 756         /* set only match and destroy quotes */
 757         j = 0;
 758         for (c = 0; pos_buf[i] >= 0; i++) {
 759                 matchBuf[c++] = matchBuf[pos_buf[i]];
 760                 j = pos_buf[i] + 1;
 761         }
 762         matchBuf[c] = '\0';
 763         /* old length matchBuf with quotes symbols */
 764         *len_with_quotes = j ? j - pos_buf[0] : 0;
 765
 766         return command_mode;
 767 #undef int_buf
 768 #undef pos_buf
 769 }
 770
 771 /*
 772  * display by column (original idea from ls applet,
 773  * very optimized by me :)
 774  */
 775 static void showfiles(void)
 776 {
 777         int ncols, row;
 778         int column_width = 0;
 779         int nfiles = num_matches;
 780         int nrows = nfiles;
 781         int l;
 782
 783         /* find the longest file name-  use that as the column width */
 784         for (row = 0; row < nrows; row++) {
 785                 l = strlen(matches[row]);
 786                 if (column_width < l)
 787                         column_width = l;
 788         }
 789         column_width += 2;              /* min space for columns */
 790         ncols = cmdedit_termw / column_width;
 791
 792         if (ncols > 1) {
 793                 nrows /= ncols;
 794                 if (nfiles % ncols)
 795                         nrows++;        /* round up fractionals */
 796         } else {
 797                 ncols = 1;
 798         }
 799         for (row = 0; row < nrows; row++) {
 800                 int n = row;
 801                 int nc;
 802
 803                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
 804                         printf("%s%-*s", matches[n],
 805                                 (int)(column_width - strlen(matches[n])), "");
 806                 }
 807                 puts(matches[n]);
 808         }
 809 }
 810
 811 static char *add_quote_for_spec_chars(char *found)
 812 {
 813         int l = 0;
 814         char *s = xmalloc((strlen(found) + 1) * 2);
 815
 816         while (*found) {
 817                 if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found))
 818                         s[l++] = '\\';
 819                 s[l++] = *found++;
 820         }
 821         s[l] = 0;
 822         return s;
 823 }
 824
 825 /* Do TAB completion */
 826 static void input_tab(smallint *lastWasTab)
 827 {
 828         if (!(state->flags & TAB_COMPLETION))
 829                 return;
 830
 831         if (!*lastWasTab) {
 832                 char *tmp, *tmp1;
 833                 size_t len_found;
 834 /*              char matchBuf[MAX_LINELEN]; */
 835 #define matchBuf (S.input_tab__matchBuf)
 836                 int find_type;
 837                 int recalc_pos;
 838
 839                 *lastWasTab = TRUE;             /* flop trigger */
 840
 841                 /* Make a local copy of the string -- up
 842                  * to the position of the cursor */
 843                 tmp = strncpy(matchBuf, command_ps, cursor);
 844                 tmp[cursor] = '\0';
 845
 846                 find_type = find_match(matchBuf, &recalc_pos);
 847
 848                 /* Free up any memory already allocated */
 849                 free_tab_completion_data();
 850
 851 #if ENABLE_FEATURE_USERNAME_COMPLETION
 852                 /* If the word starts with `~' and there is no slash in the word,
 853                  * then try completing this word as a username. */
 854                 if (state->flags & USERNAME_COMPLETION)
 855                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == 0)
 856                                 username_tab_completion(matchBuf, NULL);
 857 #endif
 858                 /* Try to match any executable in our path and everything
 859                  * in the current working directory */
 860                 if (!matches)
 861                         exe_n_cwd_tab_completion(matchBuf, find_type);
 862                 /* Sort, then remove any duplicates found */
 863                 if (matches) {
 864                         int i, n = 0;
 865                         qsort_string_vector(matches, num_matches);
 866                         for (i = 0; i < num_matches - 1; ++i) {
 867                                 if (matches[i] && matches[i+1]) { /* paranoia */
 868                                         if (strcmp(matches[i], matches[i+1]) == 0) {
 869                                                 free(matches[i]);
 870                                                 matches[i] = NULL; /* paranoia */
 871                                         } else {
 872                                                 matches[n++] = matches[i];
 873                                         }
 874                                 }
 875                         }
 876                         matches[n] = matches[i];
 877                         num_matches = n + 1;
 878                 }
 879                 /* Did we find exactly one match? */
 880                 if (!matches || num_matches > 1) {
 881                         beep();
 882                         if (!matches)
 883                                 return;         /* not found */
 884                         /* find minimal match */
 885                         tmp1 = xstrdup(matches[0]);
 886                         for (tmp = tmp1; *tmp; tmp++)
 887                                 for (len_found = 1; len_found < num_matches; len_found++)
 888                                         if (matches[len_found][(tmp - tmp1)] != *tmp) {
 889                                                 *tmp = '\0';
 890                                                 break;
 891                                         }
 892                         if (*tmp1 == '\0') {        /* have unique */
 893                                 free(tmp1);
 894                                 return;
 895                         }
 896                         tmp = add_quote_for_spec_chars(tmp1);
 897                         free(tmp1);
 898                 } else {                        /* one match */
 899                         tmp = add_quote_for_spec_chars(matches[0]);
 900                         /* for next completion current found */
 901                         *lastWasTab = FALSE;
 902
 903                         len_found = strlen(tmp);
 904                         if (tmp[len_found-1] != '/') {
 905                                 tmp[len_found] = ' ';
 906                                 tmp[len_found+1] = '\0';
 907                         }
 908                 }
 909                 len_found = strlen(tmp);
 910                 /* have space to placed match? */
 911                 if ((len_found - strlen(matchBuf) + command_len) < MAX_LINELEN) {
 912                         /* before word for match   */
 913                         command_ps[cursor - recalc_pos] = '\0';
 914                         /* save   tail line        */
 915                         strcpy(matchBuf, command_ps + cursor);
 916                         /* add    match            */
 917                         strcat(command_ps, tmp);
 918                         /* add    tail             */
 919                         strcat(command_ps, matchBuf);
 920                         /* back to begin word for match    */
 921                         input_backward(recalc_pos);
 922                         /* new pos                         */
 923                         recalc_pos = cursor + len_found;
 924                         /* new len                         */
 925                         command_len = strlen(command_ps);
 926                         /* write out the matched command   */
 927                         redraw(cmdedit_y, command_len - recalc_pos);
 928                 }
 929                 free(tmp);
 930 #undef matchBuf
 931         } else {
 932                 /* Ok -- the last char was a TAB.  Since they
 933                  * just hit TAB again, print a list of all the
 934                  * available choices... */
 935                 if (matches && num_matches > 0) {
 936                         int sav_cursor = cursor;        /* change goto_new_line() */
 937
 938                         /* Go to the next line */
 939                         goto_new_line();
 940                         showfiles();
 941                         redraw(0, command_len - sav_cursor);
 942                 }
 943         }
 944 }
 945
 946 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
 947
 948
 949 #if MAX_HISTORY > 0
 950
 951 /* state->flags is already checked to be nonzero */
 952 static void get_previous_history(void)
 953 {
 954         if (command_ps[0] != '\0' || state->history[state->cur_history] == NULL) {
 955                 free(state->history[state->cur_history]);
 956                 state->history[state->cur_history] = xstrdup(command_ps);
 957         }
 958         state->cur_history--;
 959 }
 960
 961 static int get_next_history(void)
 962 {
 963         if (state->flags & DO_HISTORY) {
 964                 int ch = state->cur_history;
 965                 if (ch < state->cnt_history) {
 966                         get_previous_history(); /* save the current history line */
 967                         state->cur_history = ch + 1;
 968                         return state->cur_history;
 969                 }
 970         }
 971         beep();
 972         return 0;
 973 }
 974
 975 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
 976 /* state->flags is already checked to be nonzero */
 977 static void load_history(const char *fromfile)
 978 {
 979         FILE *fp;
 980         int hi;
 981
 982         /* NB: do not trash old history if file can't be opened */
 983
 984         fp = fopen(fromfile, "r");
 985         if (fp) {
 986                 /* clean up old history */
 987                 for (hi = state->cnt_history; hi > 0;) {
 988                         hi--;
 989                         free(state->history[hi]);
 990                 }
 991
 992                 for (hi = 0; hi < MAX_HISTORY;) {
 993                         char *hl = xmalloc_fgetline(fp);
 994                         int l;
 995
 996                         if (!hl)
 997                                 break;
 998                         l = strlen(hl);
 999                         if (l >= MAX_LINELEN)
1000                                 hl[MAX_LINELEN-1] = '\0';
1001                         if (l == 0 || hl[0] == ' ') {
1002                                 free(hl);
1003                                 continue;
1004                         }
1005                         state->history[hi++] = hl;
1006                 }
1007                 fclose(fp);
1008                 state->cur_history = state->cnt_history = hi;
1009         }
1010 }
1011
1012 /* state->flags is already checked to be nonzero */
1013 static void save_history(const char *tofile)
1014 {
1015         FILE *fp;
1016
1017         fp = fopen(tofile, "w");
1018         if (fp) {
1019                 int i;
1020
1021                 for (i = 0; i < state->cnt_history; i++) {
1022                         fprintf(fp, "%s\n", state->history[i]);
1023                 }
1024                 fclose(fp);
1025         }
1026 }
1027 #else
1028 #define load_history(a) ((void)0)
1029 #define save_history(a) ((void)0)
1030 #endif /* FEATURE_COMMAND_SAVEHISTORY */
1031
1032 static void remember_in_history(const char *str)
1033 {
1034         int i;
1035
1036         if (!(state->flags & DO_HISTORY))
1037                 return;
1038
1039         i = state->cnt_history;
1040         free(state->history[MAX_HISTORY]);
1041         state->history[MAX_HISTORY] = NULL;
1042         /* After max history, remove the oldest command */
1043         if (i >= MAX_HISTORY) {
1044                 free(state->history[0]);
1045                 for (i = 0; i < MAX_HISTORY-1; i++)
1046                         state->history[i] = state->history[i+1];
1047         }
1048 // Maybe "if (!i || strcmp(history[i-1], command) != 0) ..."
1049 // (i.e. do not save dups?)
1050         state->history[i++] = xstrdup(str);
1051         state->cur_history = i;
1052         state->cnt_history = i;
1053 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1054         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1055                 save_history(state->hist_file);
1056 #endif
1057         USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1058 }
1059
1060 #else /* MAX_HISTORY == 0 */
1061 #define remember_in_history(a) ((void)0)
1062 #endif /* MAX_HISTORY */
1063
1064
1065 /*
1066  * This function is used to grab a character buffer
1067  * from the input file descriptor and allows you to
1068  * a string with full command editing (sort of like
1069  * a mini readline).
1070  *
1071  * The following standard commands are not implemented:
1072  * ESC-b -- Move back one word
1073  * ESC-f -- Move forward one word
1074  * ESC-d -- Delete back one word
1075  * ESC-h -- Delete forward one word
1076  * CTL-t -- Transpose two characters
1077  *
1078  * Minimalist vi-style command line editing available if configured.
1079  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1080  */
1081
1082 #if ENABLE_FEATURE_EDITING_VI
1083 static void
1084 vi_Word_motion(char *command, int eat)
1085 {
1086         while (cursor < command_len && !isspace(command[cursor]))
1087                 input_forward();
1088         if (eat) while (cursor < command_len && isspace(command[cursor]))
1089                 input_forward();
1090 }
1091
1092 static void
1093 vi_word_motion(char *command, int eat)
1094 {
1095         if (isalnum(command[cursor]) || command[cursor] == '_') {
1096                 while (cursor < command_len
1097                  && (isalnum(command[cursor+1]) || command[cursor+1] == '_'))
1098                         input_forward();
1099         } else if (ispunct(command[cursor])) {
1100                 while (cursor < command_len && ispunct(command[cursor+1]))
1101                         input_forward();
1102         }
1103
1104         if (cursor < command_len)
1105                 input_forward();
1106
1107         if (eat && cursor < command_len && isspace(command[cursor]))
1108                 while (cursor < command_len && isspace(command[cursor]))
1109                         input_forward();
1110 }
1111
1112 static void
1113 vi_End_motion(char *command)
1114 {
1115         input_forward();
1116         while (cursor < command_len && isspace(command[cursor]))
1117                 input_forward();
1118         while (cursor < command_len-1 && !isspace(command[cursor+1]))
1119                 input_forward();
1120 }
1121
1122 static void
1123 vi_end_motion(char *command)
1124 {
1125         if (cursor >= command_len-1)
1126                 return;
1127         input_forward();
1128         while (cursor < command_len-1 && isspace(command[cursor]))
1129                 input_forward();
1130         if (cursor >= command_len-1)
1131                 return;
1132         if (isalnum(command[cursor]) || command[cursor] == '_') {
1133                 while (cursor < command_len-1
1134                  && (isalnum(command[cursor+1]) || command[cursor+1] == '_')
1135                 ) {
1136                         input_forward();
1137                 }
1138         } else if (ispunct(command[cursor])) {
1139                 while (cursor < command_len-1 && ispunct(command[cursor+1]))
1140                         input_forward();
1141         }
1142 }
1143
1144 static void
1145 vi_Back_motion(char *command)
1146 {
1147         while (cursor > 0 && isspace(command[cursor-1]))
1148                 input_backward(1);
1149         while (cursor > 0 && !isspace(command[cursor-1]))
1150                 input_backward(1);
1151 }
1152
1153 static void
1154 vi_back_motion(char *command)
1155 {
1156         if (cursor <= 0)
1157                 return;
1158         input_backward(1);
1159         while (cursor > 0 && isspace(command[cursor]))
1160                 input_backward(1);
1161         if (cursor <= 0)
1162                 return;
1163         if (isalnum(command[cursor]) || command[cursor] == '_') {
1164                 while (cursor > 0
1165                  && (isalnum(command[cursor-1]) || command[cursor-1] == '_')
1166                 ) {
1167                         input_backward(1);
1168                 }
1169         } else if (ispunct(command[cursor])) {
1170                 while (cursor > 0 && ispunct(command[cursor-1]))
1171                         input_backward(1);
1172         }
1173 }
1174 #endif
1175
1176
1177 /*
1178  * read_line_input and its helpers
1179  */
1180
1181 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1182 static void parse_and_put_prompt(const char *prmt_ptr)
1183 {
1184         cmdedit_prompt = prmt_ptr;
1185         cmdedit_prmt_len = strlen(prmt_ptr);
1186         put_prompt();
1187 }
1188 #else
1189 static void parse_and_put_prompt(const char *prmt_ptr)
1190 {
1191         int prmt_len = 0;
1192         size_t cur_prmt_len = 0;
1193         char flg_not_length = '[';
1194         char *prmt_mem_ptr = xzalloc(1);
1195         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1196         char cbuf[2];
1197         char c;
1198         char *pbuf;
1199
1200         cmdedit_prmt_len = 0;
1201
1202         if (!cwd_buf) {
1203                 cwd_buf = (char *)bb_msg_unknown;
1204         }
1205
1206         cbuf[1] = '\0'; /* never changes */
1207
1208         while (*prmt_ptr) {
1209                 char *free_me = NULL;
1210
1211                 pbuf = cbuf;
1212                 c = *prmt_ptr++;
1213                 if (c == '\\') {
1214                         const char *cp = prmt_ptr;
1215                         int l;
1216
1217                         c = bb_process_escape_sequence(&prmt_ptr);
1218                         if (prmt_ptr == cp) {
1219                                 if (*cp == '\0')
1220                                         break;
1221                                 c = *prmt_ptr++;
1222
1223                                 switch (c) {
1224 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1225                                 case 'u':
1226                                         pbuf = user_buf ? user_buf : (char*)"";
1227                                         break;
1228 #endif
1229                                 case 'h':
1230                                         pbuf = free_me = safe_gethostname();
1231                                         *strchrnul(pbuf, '.') = '\0';
1232                                         break;
1233                                 case '$':
1234                                         c = (geteuid() == 0 ? '#' : '$');
1235                                         break;
1236 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1237                                 case 'w':
1238                                         /* /home/user[/something] -> ~[/something] */
1239                                         pbuf = cwd_buf;
1240                                         l = strlen(home_pwd_buf);
1241                                         if (l != 0
1242                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1243                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1244                                          && strlen(cwd_buf + l) < PATH_MAX
1245                                         ) {
1246                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1247                                         }
1248                                         break;
1249 #endif
1250                                 case 'W':
1251                                         pbuf = cwd_buf;
1252                                         cp = strrchr(pbuf, '/');
1253                                         if (cp != NULL && cp != pbuf)
1254                                                 pbuf += (cp-pbuf) + 1;
1255                                         break;
1256                                 case '!':
1257                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1258                                         break;
1259                                 case 'e': case 'E':     /* \e \E = \033 */
1260                                         c = '\033';
1261                                         break;
1262                                 case 'x': case 'X': {
1263                                         char buf2[4];
1264                                         for (l = 0; l < 3;) {
1265                                                 unsigned h;
1266                                                 buf2[l++] = *prmt_ptr;
1267                                                 buf2[l] = '\0';
1268                                                 h = strtoul(buf2, &pbuf, 16);
1269                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1270                                                         buf2[--l] = '\0';
1271                                                         break;
1272                                                 }
1273                                                 prmt_ptr++;
1274                                         }
1275                                         c = (char)strtoul(buf2, NULL, 16);
1276                                         if (c == 0)
1277                                                 c = '?';
1278                                         pbuf = cbuf;
1279                                         break;
1280                                 }
1281                                 case '[': case ']':
1282                                         if (c == flg_not_length) {
1283                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1284                                                 continue;
1285                                         }
1286                                         break;
1287                                 } /* switch */
1288                         } /* if */
1289                 } /* if */
1290                 cbuf[0] = c;
1291                 cur_prmt_len = strlen(pbuf);
1292                 prmt_len += cur_prmt_len;
1293                 if (flg_not_length != ']')
1294                         cmdedit_prmt_len += cur_prmt_len;
1295                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1296                 free(free_me);
1297         } /* while */
1298
1299         if (cwd_buf != (char *)bb_msg_unknown)
1300                 free(cwd_buf);
1301         cmdedit_prompt = prmt_mem_ptr;
1302         put_prompt();
1303 }
1304 #endif
1305
1306 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1307 {
1308         cmdedit_termw = w;
1309         if (redraw_flg) {
1310                 /* new y for current cursor */
1311                 int new_y = (cursor + cmdedit_prmt_len) / w;
1312                 /* redraw */
1313                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1314                 fflush(stdout);
1315         }
1316 }
1317
1318 static void win_changed(int nsig)
1319 {
1320         int width;
1321         get_terminal_width_height(0, &width, NULL);
1322         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1323         if (nsig == SIGWINCH)
1324                 signal(SIGWINCH, win_changed); /* rearm ourself */
1325 }
1326
1327 /*
1328  * The emacs and vi modes share much of the code in the big
1329  * command loop.  Commands entered when in vi's command mode (aka
1330  * "escape mode") get an extra bit added to distinguish them --
1331  * this keeps them from being self-inserted.  This clutters the
1332  * big switch a bit, but keeps all the code in one place.
1333  */
1334
1335 #define vbit 0x100
1336
1337 /* leave out the "vi-mode"-only case labels if vi editing isn't
1338  * configured. */
1339 #define vi_case(caselabel) USE_FEATURE_EDITING(case caselabel)
1340
1341 /* convert uppercase ascii to equivalent control char, for readability */
1342 #undef CTRL
1343 #define CTRL(a) ((a) & ~0x40)
1344
1345 /* Returns:
1346  * -1 on read errors or EOF, or on bare Ctrl-D,
1347  * 0  on ctrl-C (the line entered is still returned in 'command'),
1348  * >0 length of input string, including terminating '\n'
1349  */
1350 int read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1351 {
1352 #if ENABLE_FEATURE_TAB_COMPLETION
1353         smallint lastWasTab = FALSE;
1354 #endif
1355         unsigned int ic;
1356         unsigned char c;
1357         smallint break_out = 0;
1358 #if ENABLE_FEATURE_EDITING_VI
1359         smallint vi_cmdmode = 0;
1360         smalluint prevc;
1361 #endif
1362         struct termios initial_settings;
1363         struct termios new_settings;
1364
1365         INIT_S();
1366
1367         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1368          || !(initial_settings.c_lflag & ECHO)
1369         ) {
1370                 /* Happens when e.g. stty -echo was run before */
1371                 int len;
1372                 parse_and_put_prompt(prompt);
1373                 fflush(stdout);
1374                 if (fgets(command, maxsize, stdin) == NULL)
1375                         len = -1; /* EOF or error */
1376                 else
1377                         len = strlen(command);
1378                 DEINIT_S();
1379                 return len;
1380         }
1381
1382 // FIXME: audit & improve this
1383         if (maxsize > MAX_LINELEN)
1384                 maxsize = MAX_LINELEN;
1385
1386         /* With null flags, no other fields are ever used */
1387         state = st ? st : (line_input_t*) &const_int_0;
1388 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1389         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1390                 load_history(state->hist_file);
1391 #endif
1392
1393         /* prepare before init handlers */
1394         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1395         command_len = 0;
1396         command_ps = command;
1397         command[0] = '\0';
1398
1399         new_settings = initial_settings;
1400         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1401         /* Turn off echoing and CTRL-C, so we can trap it */
1402         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1403         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1404         new_settings.c_cc[VMIN] = 1;
1405         new_settings.c_cc[VTIME] = 0;
1406         /* Turn off CTRL-C, so we can trap it */
1407 #ifndef _POSIX_VDISABLE
1408 #define _POSIX_VDISABLE '\0'
1409 #endif
1410         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1411         tcsetattr(STDIN_FILENO, TCSANOW, &new_settings);
1412
1413         /* Now initialize things */
1414         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1415         win_changed(0); /* do initial resizing */
1416 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1417         {
1418                 struct passwd *entry;
1419
1420                 entry = getpwuid(geteuid());
1421                 if (entry) {
1422                         user_buf = xstrdup(entry->pw_name);
1423                         home_pwd_buf = xstrdup(entry->pw_dir);
1424                 }
1425         }
1426 #endif
1427         /* Print out the command prompt */
1428         parse_and_put_prompt(prompt);
1429
1430         while (1) {
1431                 fflush(NULL);
1432
1433                 if (nonblock_safe_read(STDIN_FILENO, &c, 1) < 1) {
1434                         /* if we can't read input then exit */
1435                         goto prepare_to_die;
1436                 }
1437
1438                 ic = c;
1439
1440 #if ENABLE_FEATURE_EDITING_VI
1441                 newdelflag = 1;
1442                 if (vi_cmdmode)
1443                         ic |= vbit;
1444 #endif
1445                 switch (ic) {
1446                 case '\n':
1447                 case '\r':
1448                 vi_case('\n'|vbit:)
1449                 vi_case('\r'|vbit:)
1450                         /* Enter */
1451                         goto_new_line();
1452                         break_out = 1;
1453                         break;
1454                 case CTRL('A'):
1455                 vi_case('0'|vbit:)
1456                         /* Control-a -- Beginning of line */
1457                         input_backward(cursor);
1458                         break;
1459                 case CTRL('B'):
1460                 vi_case('h'|vbit:)
1461                 vi_case('\b'|vbit:)
1462                 vi_case('\x7f'|vbit:) /* DEL */
1463                         /* Control-b -- Move back one character */
1464                         input_backward(1);
1465                         break;
1466                 case CTRL('C'):
1467                 vi_case(CTRL('C')|vbit:)
1468                         /* Control-c -- stop gathering input */
1469                         goto_new_line();
1470                         command_len = 0;
1471                         break_out = -1; /* "do not append '\n'" */
1472                         break;
1473                 case CTRL('D'):
1474                         /* Control-d -- Delete one character, or exit
1475                          * if the len=0 and no chars to delete */
1476                         if (command_len == 0) {
1477                                 errno = 0;
1478  prepare_to_die:
1479                                 /* to control stopped jobs */
1480                                 break_out = command_len = -1;
1481                                 break;
1482                         }
1483                         input_delete(0);
1484                         break;
1485
1486                 case CTRL('E'):
1487                 vi_case('$'|vbit:)
1488                         /* Control-e -- End of line */
1489                         input_end();
1490                         break;
1491                 case CTRL('F'):
1492                 vi_case('l'|vbit:)
1493                 vi_case(' '|vbit:)
1494                         /* Control-f -- Move forward one character */
1495                         input_forward();
1496                         break;
1497
1498                 case '\b':
1499                 case '\x7f': /* DEL */
1500                         /* Control-h and DEL */
1501                         input_backspace();
1502                         break;
1503
1504 #if ENABLE_FEATURE_TAB_COMPLETION
1505                 case '\t':
1506                         input_tab(&lastWasTab);
1507                         break;
1508 #endif
1509
1510                 case CTRL('K'):
1511                         /* Control-k -- clear to end of line */
1512                         command[cursor] = 0;
1513                         command_len = cursor;
1514                         printf("\033[J");
1515                         break;
1516                 case CTRL('L'):
1517                 vi_case(CTRL('L')|vbit:)
1518                         /* Control-l -- clear screen */
1519                         printf("\033[H");
1520                         redraw(0, command_len - cursor);
1521                         break;
1522
1523 #if MAX_HISTORY > 0
1524                 case CTRL('N'):
1525                 vi_case(CTRL('N')|vbit:)
1526                 vi_case('j'|vbit:)
1527                         /* Control-n -- Get next command in history */
1528                         if (get_next_history())
1529                                 goto rewrite_line;
1530                         break;
1531                 case CTRL('P'):
1532                 vi_case(CTRL('P')|vbit:)
1533                 vi_case('k'|vbit:)
1534                         /* Control-p -- Get previous command from history */
1535                         if ((state->flags & DO_HISTORY) && state->cur_history > 0) {
1536                                 get_previous_history();
1537                                 goto rewrite_line;
1538                         }
1539                         beep();
1540                         break;
1541 #endif
1542
1543                 case CTRL('U'):
1544                 vi_case(CTRL('U')|vbit:)
1545                         /* Control-U -- Clear line before cursor */
1546                         if (cursor) {
1547                                 strcpy(command, command + cursor);
1548                                 command_len -= cursor;
1549                                 redraw(cmdedit_y, command_len);
1550                         }
1551                         break;
1552                 case CTRL('W'):
1553                 vi_case(CTRL('W')|vbit:)
1554                         /* Control-W -- Remove the last word */
1555                         while (cursor > 0 && isspace(command[cursor-1]))
1556                                 input_backspace();
1557                         while (cursor > 0 && !isspace(command[cursor-1]))
1558                                 input_backspace();
1559                         break;
1560
1561 #if ENABLE_FEATURE_EDITING_VI
1562                 case 'i'|vbit:
1563                         vi_cmdmode = 0;
1564                         break;
1565                 case 'I'|vbit:
1566                         input_backward(cursor);
1567                         vi_cmdmode = 0;
1568                         break;
1569                 case 'a'|vbit:
1570                         input_forward();
1571                         vi_cmdmode = 0;
1572                         break;
1573                 case 'A'|vbit:
1574                         input_end();
1575                         vi_cmdmode = 0;
1576                         break;
1577                 case 'x'|vbit:
1578                         input_delete(1);
1579                         break;
1580                 case 'X'|vbit:
1581                         if (cursor > 0) {
1582                                 input_backward(1);
1583                                 input_delete(1);
1584                         }
1585                         break;
1586                 case 'W'|vbit:
1587                         vi_Word_motion(command, 1);
1588                         break;
1589                 case 'w'|vbit:
1590                         vi_word_motion(command, 1);
1591                         break;
1592                 case 'E'|vbit:
1593                         vi_End_motion(command);
1594                         break;
1595                 case 'e'|vbit:
1596                         vi_end_motion(command);
1597                         break;
1598                 case 'B'|vbit:
1599                         vi_Back_motion(command);
1600                         break;
1601                 case 'b'|vbit:
1602                         vi_back_motion(command);
1603                         break;
1604                 case 'C'|vbit:
1605                         vi_cmdmode = 0;
1606                         /* fall through */
1607                 case 'D'|vbit:
1608                         goto clear_to_eol;
1609
1610                 case 'c'|vbit:
1611                         vi_cmdmode = 0;
1612                         /* fall through */
1613                 case 'd'|vbit: {
1614                         int nc, sc;
1615                         sc = cursor;
1616                         prevc = ic;
1617                         if (safe_read(STDIN_FILENO, &c, 1) < 1)
1618                                 goto prepare_to_die;
1619                         if (c == (prevc & 0xff)) {
1620                                 /* "cc", "dd" */
1621                                 input_backward(cursor);
1622                                 goto clear_to_eol;
1623                                 break;
1624                         }
1625                         switch (c) {
1626                         case 'w':
1627                         case 'W':
1628                         case 'e':
1629                         case 'E':
1630                                 switch (c) {
1631                                 case 'w':   /* "dw", "cw" */
1632                                         vi_word_motion(command, vi_cmdmode);
1633                                         break;
1634                                 case 'W':   /* 'dW', 'cW' */
1635                                         vi_Word_motion(command, vi_cmdmode);
1636                                         break;
1637                                 case 'e':   /* 'de', 'ce' */
1638                                         vi_end_motion(command);
1639                                         input_forward();
1640                                         break;
1641                                 case 'E':   /* 'dE', 'cE' */
1642                                         vi_End_motion(command);
1643                                         input_forward();
1644                                         break;
1645                                 }
1646                                 nc = cursor;
1647                                 input_backward(cursor - sc);
1648                                 while (nc-- > cursor)
1649                                         input_delete(1);
1650                                 break;
1651                         case 'b':  /* "db", "cb" */
1652                         case 'B':  /* implemented as B */
1653                                 if (c == 'b')
1654                                         vi_back_motion(command);
1655                                 else
1656                                         vi_Back_motion(command);
1657                                 while (sc-- > cursor)
1658                                         input_delete(1);
1659                                 break;
1660                         case ' ':  /* "d ", "c " */
1661                                 input_delete(1);
1662                                 break;
1663                         case '$':  /* "d$", "c$" */
1664                         clear_to_eol:
1665                                 while (cursor < command_len)
1666                                         input_delete(1);
1667                                 break;
1668                         }
1669                         break;
1670                 }
1671                 case 'p'|vbit:
1672                         input_forward();
1673                         /* fallthrough */
1674                 case 'P'|vbit:
1675                         put();
1676                         break;
1677                 case 'r'|vbit:
1678                         if (safe_read(STDIN_FILENO, &c, 1) < 1)
1679                                 goto prepare_to_die;
1680                         if (c == 0)
1681                                 beep();
1682                         else {
1683                                 *(command + cursor) = c;
1684                                 bb_putchar(c);
1685                                 bb_putchar('\b');
1686                         }
1687                         break;
1688 #endif /* FEATURE_COMMAND_EDITING_VI */
1689
1690                 case '\x1b': /* ESC */
1691
1692 #if ENABLE_FEATURE_EDITING_VI
1693                         if (state->flags & VI_MODE) {
1694                                 /* ESC: insert mode --> command mode */
1695                                 vi_cmdmode = 1;
1696                                 input_backward(1);
1697                                 break;
1698                         }
1699 #endif
1700                         /* escape sequence follows */
1701                         if (safe_read(STDIN_FILENO, &c, 1) < 1)
1702                                 goto prepare_to_die;
1703                         /* different vt100 emulations */
1704                         if (c == '[' || c == 'O') {
1705                 vi_case('['|vbit:)
1706                 vi_case('O'|vbit:)
1707                                 if (safe_read(STDIN_FILENO, &c, 1) < 1)
1708                                         goto prepare_to_die;
1709                         }
1710                         if (c >= '1' && c <= '9') {
1711                                 unsigned char dummy;
1712
1713                                 if (safe_read(STDIN_FILENO, &dummy, 1) < 1)
1714                                         goto prepare_to_die;
1715                                 if (dummy != '~')
1716                                         c = '\0';
1717                         }
1718
1719                         switch (c) {
1720 #if ENABLE_FEATURE_TAB_COMPLETION
1721                         case '\t':                      /* Alt-Tab */
1722                                 input_tab(&lastWasTab);
1723                                 break;
1724 #endif
1725 #if MAX_HISTORY > 0
1726                         case 'A':
1727                                 /* Up Arrow -- Get previous command from history */
1728                                 if ((state->flags & DO_HISTORY) && state->cur_history > 0) {
1729                                         get_previous_history();
1730                                         goto rewrite_line;
1731                                 }
1732                                 beep();
1733                                 break;
1734                         case 'B':
1735                                 /* Down Arrow -- Get next command in history */
1736                                 if (!get_next_history())
1737                                         break;
1738  rewrite_line:
1739                                 /* Rewrite the line with the selected history item */
1740                                 /* change command */
1741                                 command_len = strlen(strcpy(command, state->history[state->cur_history]));
1742                                 /* redraw and go to eol (bol, in vi */
1743                                 redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
1744                                 break;
1745 #endif
1746                         case 'C':
1747                                 /* Right Arrow -- Move forward one character */
1748                                 input_forward();
1749                                 break;
1750                         case 'D':
1751                                 /* Left Arrow -- Move back one character */
1752                                 input_backward(1);
1753                                 break;
1754                         case '3':
1755                                 /* Delete */
1756                                 input_delete(0);
1757                                 break;
1758                         case '1': // vt100? linux vt? or what?
1759                         case '7': // vt100? linux vt? or what?
1760                         case 'H': /* xterm's <Home> */
1761                                 input_backward(cursor);
1762                                 break;
1763                         case '4': // vt100? linux vt? or what?
1764                         case '8': // vt100? linux vt? or what?
1765                         case 'F': /* xterm's <End> */
1766                                 input_end();
1767                                 break;
1768                         default:
1769                                 c = '\0';
1770                                 beep();
1771                         }
1772                         break;
1773
1774                 default:        /* If it's regular input, do the normal thing */
1775
1776                         /* Control-V -- force insert of next char */
1777                         if (c == CTRL('V')) {
1778                                 if (safe_read(STDIN_FILENO, &c, 1) < 1)
1779                                         goto prepare_to_die;
1780                                 if (c == 0) {
1781                                         beep();
1782                                         break;
1783                                 }
1784                         }
1785
1786 #if ENABLE_FEATURE_EDITING_VI
1787                         if (vi_cmdmode)  /* Don't self-insert */
1788                                 break;
1789 #endif
1790                         if ((int)command_len >= (maxsize - 2))        /* Need to leave space for enter */
1791                                 break;
1792
1793                         command_len++;
1794                         if (cursor == (command_len - 1)) {      /* Append if at the end of the line */
1795                                 command[cursor] = c;
1796                                 command[cursor+1] = '\0';
1797                                 cmdedit_set_out_char(' ');
1798                         } else {                        /* Insert otherwise */
1799                                 int sc = cursor;
1800
1801                                 memmove(command + sc + 1, command + sc, command_len - sc);
1802                                 command[sc] = c;
1803                                 sc++;
1804                                 /* rewrite from cursor */
1805                                 input_end();
1806                                 /* to prev x pos + 1 */
1807                                 input_backward(cursor - sc);
1808                         }
1809                         break;
1810                 }
1811                 if (break_out)                  /* Enter is the command terminator, no more input. */
1812                         break;
1813
1814 #if ENABLE_FEATURE_TAB_COMPLETION
1815                 if (c != '\t')
1816                         lastWasTab = FALSE;
1817 #endif
1818         }
1819
1820         if (command_len > 0)
1821                 remember_in_history(command);
1822
1823         if (break_out > 0) {
1824                 command[command_len++] = '\n';
1825                 command[command_len] = '\0';
1826         }
1827
1828 #if ENABLE_FEATURE_TAB_COMPLETION
1829         free_tab_completion_data();
1830 #endif
1831
1832         /* restore initial_settings */
1833         tcsetattr(STDIN_FILENO, TCSANOW, &initial_settings);
1834         /* restore SIGWINCH handler */
1835         signal(SIGWINCH, previous_SIGWINCH_handler);
1836         fflush(stdout);
1837
1838         DEINIT_S();
1839
1840         return command_len;
1841 }
1842
1843 line_input_t *new_line_input_t(int flags)
1844 {
1845         line_input_t *n = xzalloc(sizeof(*n));
1846         n->flags = flags;
1847         return n;
1848 }
1849
1850 #else
1851
1852 #undef read_line_input
1853 int read_line_input(const char* prompt, char* command, int maxsize)
1854 {
1855         fputs(prompt, stdout);
1856         fflush(stdout);
1857         fgets(command, maxsize, stdin);
1858         return strlen(command);
1859 }
1860
1861 #endif  /* FEATURE_COMMAND_EDITING */
1862
1863
1864 /*
1865  * Testing
1866  */
1867
1868 #ifdef TEST
1869
1870 #include <locale.h>
1871
1872 const char *applet_name = "debug stuff usage";
1873
1874 int main(int argc, char **argv)
1875 {
1876         char buff[MAX_LINELEN];
1877         char *prompt =
1878 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
1879                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
1880                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
1881                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
1882 #else
1883                 "% ";
1884 #endif
1885
1886 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
1887         setlocale(LC_ALL, "");
1888 #endif
1889         while (1) {
1890                 int l;
1891                 l = read_line_input(prompt, buff);
1892                 if (l <= 0 || buff[l-1] != '\n')
1893                         break;
1894                 buff[l-1] = 0;
1895                 printf("*** read_line_input() returned line =%s=\n", buff);
1896         }
1897         printf("*** read_line_input() detect ^D\n");
1898         return 0;
1899 }
1900
1901 #endif  /* TEST */