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