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