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