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 #define ENABLE_FEATURE_CLEAN_UP 0
  45
  46 #endif  /* TEST */
  47
  48
  49 /* Entire file (except TESTing part) sits inside this #if */
  50 #if ENABLE_FEATURE_EDITING
  51
  52 #if ENABLE_LOCALE_SUPPORT
  53 #define Isprint(c) isprint(c)
  54 #else
  55 #define Isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233'))
  56 #endif
  57
  58 #define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
  59 (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  60
  61 enum { MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN };
  62
  63 static line_input_t *state;
  64
  65 static struct termios initial_settings, new_settings;
  66
  67 static volatile unsigned cmdedit_termw = 80;        /* actual terminal width */
  68
  69 static int cmdedit_x;           /* real x terminal position */
  70 static int cmdedit_y;           /* pseudoreal y terminal position */
  71 static int cmdedit_prmt_len;    /* length of prompt (without colors etc) */
  72
  73 static unsigned cursor;
  74 static unsigned command_len;
  75 static char *command_ps;
  76 static const char *cmdedit_prompt;
  77
  78 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
  79 static char *hostname_buf;
  80 static int num_ok_lines = 1;
  81 #endif
  82
  83 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  84 static char *user_buf = (char*)"";
  85 static char *home_pwd_buf = (char*)"";
  86 #endif
  87
  88 /* Put 'command_ps[cursor]', cursor++.
  89  * Advance cursor on screen. If we reached right margin, scroll text up
  90  * and remove terminal margin effect by printing 'next_char' */
  91 static void cmdedit_set_out_char(int next_char)
  92 {
  93         int c = (unsigned char)command_ps[cursor];
  94
  95         if (c == '\0') {
  96                 /* erase character after end of input string */
  97                 c = ' ';
  98         }
  99 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 100         /* Display non-printable characters in reverse */
 101         if (!Isprint(c)) {
 102                 if (c >= 128)
 103                         c -= 128;
 104                 if (c < ' ')
 105                         c += '@';
 106                 if (c == 127)
 107                         c = '?';
 108                 printf("\033[7m%c\033[0m", c);
 109         } else
 110 #endif
 111         {
 112                 if (initial_settings.c_lflag & ECHO)
 113                         putchar(c);
 114         }
 115         if (++cmdedit_x >= cmdedit_termw) {
 116                 /* terminal is scrolled down */
 117                 cmdedit_y++;
 118                 cmdedit_x = 0;
 119                 /* destroy "(auto)margin" */
 120                 putchar(next_char);
 121                 putchar('\b');
 122         }
 123 // Huh? What if command_ps[cursor] == '\0' (we are at the end already?)
 124         cursor++;
 125 }
 126
 127 /* Move to end of line (by printing all chars till the end) */
 128 static void input_end(void)
 129 {
 130         while (cursor < command_len)
 131                 cmdedit_set_out_char(' ');
 132 }
 133
 134 /* Go to the next line */
 135 static void goto_new_line(void)
 136 {
 137         input_end();
 138         if (cmdedit_x)
 139                 putchar('\n');
 140 }
 141
 142
 143 static void out1str(const char *s)
 144 {
 145         if (s)
 146                 fputs(s, stdout);
 147 }
 148
 149 static void beep(void)
 150 {
 151         putchar('\007');
 152 }
 153
 154 /* Move back one character */
 155 /* (optimized for slow terminals) */
 156 static void input_backward(unsigned num)
 157 {
 158         int count_y;
 159
 160         if (num > cursor)
 161                 num = cursor;
 162         if (!num)
 163                 return;
 164         cursor -= num;
 165
 166         if (cmdedit_x >= num) {
 167                 cmdedit_x -= num;
 168                 if (num <= 4) {
 169                         printf("\b\b\b\b" + (4-num));
 170                         return;
 171                 }
 172                 printf("\033[%uD", num);
 173                 return;
 174         }
 175
 176         /* Need to go one or more lines up */
 177         num -= cmdedit_x;
 178         count_y = 1 + (num / cmdedit_termw);
 179         cmdedit_y -= count_y;
 180         cmdedit_x = cmdedit_termw * count_y - num;
 181         /* go to 1st column; go up; go to correct column */
 182         printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
 183 }
 184
 185 static void put_prompt(void)
 186 {
 187         out1str(cmdedit_prompt);
 188         cmdedit_x = cmdedit_prmt_len;
 189         cursor = 0;
 190 // Huh? what if cmdedit_prmt_len >= width?
 191         cmdedit_y = 0;                  /* new quasireal y */
 192 }
 193
 194 /* draw prompt, editor line, and clear tail */
 195 static void redraw(int y, int back_cursor)
 196 {
 197         if (y > 0)                              /* up to start y */
 198                 printf("\033[%dA", y);
 199         putchar('\r');
 200         put_prompt();
 201         input_end();                            /* rewrite */
 202         printf("\033[J");                       /* erase after cursor */
 203         input_backward(back_cursor);
 204 }
 205
 206 #if ENABLE_FEATURE_EDITING_VI
 207 #define DELBUFSIZ 128
 208 static char *delbuf;  /* a (malloced) place to store deleted characters */
 209 static char *delp;
 210 static char newdelflag;      /* whether delbuf should be reused yet */
 211 #endif
 212
 213 /* Delete the char in front of the cursor, optionally saving it
 214  * for later putback */
 215 static void input_delete(int save)
 216 {
 217         int j = cursor;
 218
 219         if (j == command_len)
 220                 return;
 221
 222 #if ENABLE_FEATURE_EDITING_VI
 223         if (save) {
 224                 if (newdelflag) {
 225                         if (!delbuf)
 226                                 delbuf = malloc(DELBUFSIZ);
 227                         /* safe if malloc fails */
 228                         delp = delbuf;
 229                         newdelflag = 0;
 230                 }
 231                 if (delbuf && (delp - delbuf < DELBUFSIZ))
 232                         *delp++ = command_ps[j];
 233         }
 234 #endif
 235
 236         strcpy(command_ps + j, command_ps + j + 1);
 237         command_len--;
 238         input_end();                    /* rewrite new line */
 239         cmdedit_set_out_char(' ');      /* erase char */
 240         input_backward(cursor - j);     /* back to old pos cursor */
 241 }
 242
 243 #if ENABLE_FEATURE_EDITING_VI
 244 static void put(void)
 245 {
 246         int ocursor;
 247         int j = delp - delbuf;
 248
 249         if (j == 0)
 250                 return;
 251         ocursor = cursor;
 252         /* open hole and then fill it */
 253         memmove(command_ps + cursor + j, command_ps + cursor, command_len - cursor + 1);
 254         strncpy(command_ps + cursor, delbuf, j);
 255         command_len += j;
 256         input_end();                    /* rewrite new line */
 257         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 258 }
 259 #endif
 260
 261 /* Delete the char in back of the cursor */
 262 static void input_backspace(void)
 263 {
 264         if (cursor > 0) {
 265                 input_backward(1);
 266                 input_delete(0);
 267         }
 268 }
 269
 270 /* Move forward one character */
 271 static void input_forward(void)
 272 {
 273         if (cursor < command_len)
 274                 cmdedit_set_out_char(command_ps[cursor + 1]);
 275 }
 276
 277
 278 #if ENABLE_FEATURE_TAB_COMPLETION
 279
 280 static char **matches;
 281 static unsigned num_matches;
 282
 283 static void free_tab_completion_data(void)
 284 {
 285         if (matches) {
 286                 while (num_matches)
 287                         free(matches[--num_matches]);
 288                 free(matches);
 289                 matches = NULL;
 290         }
 291 }
 292
 293 static void add_match(char *matched)
 294 {
 295         int nm = num_matches;
 296         int nm1 = nm + 1;
 297
 298         matches = xrealloc(matches, nm1 * sizeof(char *));
 299         matches[nm] = matched;
 300         num_matches++;
 301 }
 302
 303 #if ENABLE_FEATURE_USERNAME_COMPLETION
 304 static void username_tab_completion(char *ud, char *with_shash_flg)
 305 {
 306         struct passwd *entry;
 307         int userlen;
 308
 309         ud++;                           /* ~user/... to user/... */
 310         userlen = strlen(ud);
 311
 312         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 313                 char *sav_ud = ud - 1;
 314                 char *home = 0;
 315                 char *temp;
 316
 317                 if (*ud == '/') {       /* "~/..."     */
 318                         home = home_pwd_buf;
 319                 } else {
 320                         /* "~user/..." */
 321                         temp = strchr(ud, '/');
 322                         *temp = 0;              /* ~user\0 */
 323                         entry = getpwnam(ud);
 324                         *temp = '/';            /* restore ~user/... */
 325                         ud = temp;
 326                         if (entry)
 327                                 home = entry->pw_dir;
 328                 }
 329                 if (home) {
 330                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 331                                 char temp2[MAX_LINELEN];     /* argument size */
 332
 333                                 /* /home/user/... */
 334                                 sprintf(temp2, "%s%s", home, ud);
 335                                 strcpy(sav_ud, temp2);
 336                         }
 337                 }
 338         } else {
 339                 /* "~[^/]*" */
 340                 /* Using _r function to avoid pulling in static buffers */
 341                 char line_buff[256];
 342                 struct passwd pwd;
 343                 struct passwd *result;
 344
 345                 setpwent();
 346                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 347                         /* Null usernames should result in all users as possible completions. */
 348                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 349                                 add_match(xasprintf("~%s/", pwd.pw_name));
 350                         }
 351                 }
 352                 endpwent();
 353         }
 354 }
 355 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 356
 357 enum {
 358         FIND_EXE_ONLY = 0,
 359         FIND_DIR_ONLY = 1,
 360         FIND_FILE_ONLY = 2,
 361 };
 362
 363 static int path_parse(char ***p, int flags)
 364 {
 365         int npth;
 366         const char *pth;
 367         char *tmp;
 368         char **res;
 369
 370         /* if not setenv PATH variable, to search cur dir "." */
 371         if (flags != FIND_EXE_ONLY)
 372                 return 1;
 373
 374         if (state->flags & WITH_PATH_LOOKUP)
 375                 pth = state->path_lookup;
 376         else
 377                 pth = getenv("PATH");
 378         /* PATH=<empty> or PATH=:<empty> */
 379         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 380                 return 1;
 381
 382         tmp = (char*)pth;
 383         npth = 1; /* path component count */
 384         while (1) {
 385                 tmp = strchr(tmp, ':');
 386                 if (!tmp)
 387                         break;
 388                 if (*++tmp == '\0')
 389                         break;  /* :<empty> */
 390                 npth++;
 391         }
 392
 393         res = xmalloc(npth * sizeof(char*));
 394         res[0] = tmp = xstrdup(pth);
 395         npth = 1;
 396         while (1) {
 397                 tmp = strchr(tmp, ':');
 398                 if (!tmp)
 399                         break;
 400                 *tmp++ = '\0'; /* ':' -> '\0' */
 401                 if (*tmp == '\0')
 402                         break; /* :<empty> */
 403                 res[npth++] = tmp;
 404         }
 405         *p = res;
 406         return npth;
 407 }
 408
 409 static void exe_n_cwd_tab_completion(char *command, int type)
 410 {
 411         DIR *dir;
 412         struct dirent *next;
 413         char dirbuf[MAX_LINELEN];
 414         struct stat st;
 415         char *path1[1];
 416         char **paths = path1;
 417         int npaths;
 418         int i;
 419         char *found;
 420         char *pfind = strrchr(command, '/');
 421
 422         npaths = 1;
 423         path1[0] = (char*)".";
 424
 425         if (pfind == NULL) {
 426                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 427                 npaths = path_parse(&paths, type);
 428                 pfind = command;
 429         } else {
 430                 /* dirbuf = ".../.../.../" */
 431                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 432 #if ENABLE_FEATURE_USERNAME_COMPLETION
 433                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 434                         username_tab_completion(dirbuf, dirbuf);
 435 #endif
 436                 paths[0] = dirbuf;
 437                 /* point to 'l' in "..../last_component" */
 438                 pfind++;
 439         }
 440
 441         for (i = 0; i < npaths; i++) {
 442                 dir = opendir(paths[i]);
 443                 if (!dir)                       /* Don't print an error */
 444                         continue;
 445
 446                 while ((next = readdir(dir)) != NULL) {
 447                         int len1;
 448                         const char *str_found = next->d_name;
 449
 450                         /* matched? */
 451                         if (strncmp(str_found, pfind, strlen(pfind)))
 452                                 continue;
 453                         /* not see .name without .match */
 454                         if (*str_found == '.' && *pfind == 0) {
 455                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 456                                         continue;
 457                                 str_found = ""; /* only "/" */
 458                         }
 459                         found = concat_path_file(paths[i], str_found);
 460                         /* hmm, remover in progress? */
 461                         if (stat(found, &st) < 0)
 462                                 goto cont;
 463                         /* find with dirs? */
 464                         if (paths[i] != dirbuf)
 465                                 strcpy(found, next->d_name);    /* only name */
 466
 467                         len1 = strlen(found);
 468                         found = xrealloc(found, len1 + 2);
 469                         found[len1] = '\0';
 470                         found[len1+1] = '\0';
 471
 472                         if (S_ISDIR(st.st_mode)) {
 473                                 /* name is directory      */
 474                                 if (found[len1-1] != '/') {
 475                                         found[len1] = '/';
 476                                 }
 477                         } else {
 478                                 /* not put found file if search only dirs for cd */
 479                                 if (type == FIND_DIR_ONLY)
 480                                         goto cont;
 481                         }
 482                         /* Add it to the list */
 483                         add_match(found);
 484                         continue;
 485  cont:
 486                         free(found);
 487                 }
 488                 closedir(dir);
 489         }
 490         if (paths != path1) {
 491                 free(paths[0]);                 /* allocated memory only in first member */
 492                 free(paths);
 493         }
 494 }
 495
 496 #define QUOT (UCHAR_MAX+1)
 497
 498 #define collapse_pos(is, in) { \
 499         memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in))*sizeof(int)); \
 500         memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in))*sizeof(int)); }
 501
 502 static int find_match(char *matchBuf, int *len_with_quotes)
 503 {
 504         int i, j;
 505         int command_mode;
 506         int c, c2;
 507         int int_buf[MAX_LINELEN + 1];
 508         int pos_buf[MAX_LINELEN + 1];
 509
 510         /* set to integer dimension characters and own positions */
 511         for (i = 0;; i++) {
 512                 int_buf[i] = (unsigned char)matchBuf[i];
 513                 if (int_buf[i] == 0) {
 514                         pos_buf[i] = -1;        /* indicator end line */
 515                         break;
 516                 }
 517                 pos_buf[i] = i;
 518         }
 519
 520         /* mask \+symbol and convert '\t' to ' ' */
 521         for (i = j = 0; matchBuf[i]; i++, j++)
 522                 if (matchBuf[i] == '\\') {
 523                         collapse_pos(j, j + 1);
 524                         int_buf[j] |= QUOT;
 525                         i++;
 526 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 527                         if (matchBuf[i] == '\t')        /* algorithm equivalent */
 528                                 int_buf[j] = ' ' | QUOT;
 529 #endif
 530                 }
 531 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 532                 else if (matchBuf[i] == '\t')
 533                         int_buf[j] = ' ';
 534 #endif
 535
 536         /* mask "symbols" or 'symbols' */
 537         c2 = 0;
 538         for (i = 0; int_buf[i]; i++) {
 539                 c = int_buf[i];
 540                 if (c == '\'' || c == '"') {
 541                         if (c2 == 0)
 542                                 c2 = c;
 543                         else {
 544                                 if (c == c2)
 545                                         c2 = 0;
 546                                 else
 547                                         int_buf[i] |= QUOT;
 548                         }
 549                 } else if (c2 != 0 && c != '$')
 550                         int_buf[i] |= QUOT;
 551         }
 552
 553         /* skip commands with arguments if line has commands delimiters */
 554         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 555         for (i = 0; int_buf[i]; i++) {
 556                 c = int_buf[i];
 557                 c2 = int_buf[i + 1];
 558                 j = i ? int_buf[i - 1] : -1;
 559                 command_mode = 0;
 560                 if (c == ';' || c == '&' || c == '|') {
 561                         command_mode = 1 + (c == c2);
 562                         if (c == '&') {
 563                                 if (j == '>' || j == '<')
 564                                         command_mode = 0;
 565                         } else if (c == '|' && j == '>')
 566                                 command_mode = 0;
 567                 }
 568                 if (command_mode) {
 569                         collapse_pos(0, i + command_mode);
 570                         i = -1;                         /* hack incremet */
 571                 }
 572         }
 573         /* collapse `command...` */
 574         for (i = 0; int_buf[i]; i++)
 575                 if (int_buf[i] == '`') {
 576                         for (j = i + 1; int_buf[j]; j++)
 577                                 if (int_buf[j] == '`') {
 578                                         collapse_pos(i, j + 1);
 579                                         j = 0;
 580                                         break;
 581                                 }
 582                         if (j) {
 583                                 /* not found close ` - command mode, collapse all previous */
 584                                 collapse_pos(0, i + 1);
 585                                 break;
 586                         } else
 587                                 i--;                    /* hack incremet */
 588                 }
 589
 590         /* collapse (command...(command...)...) or {command...{command...}...} */
 591         c = 0;                                          /* "recursive" level */
 592         c2 = 0;
 593         for (i = 0; int_buf[i]; i++)
 594                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 595                         if (int_buf[i] == '(')
 596                                 c++;
 597                         else
 598                                 c2++;
 599                         collapse_pos(0, i + 1);
 600                         i = -1;                         /* hack incremet */
 601                 }
 602         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++)
 603                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 604                         if (int_buf[i] == ')')
 605                                 c--;
 606                         else
 607                                 c2--;
 608                         collapse_pos(0, i + 1);
 609                         i = -1;                         /* hack incremet */
 610                 }
 611
 612         /* skip first not quote space */
 613         for (i = 0; int_buf[i]; i++)
 614                 if (int_buf[i] != ' ')
 615                         break;
 616         if (i)
 617                 collapse_pos(0, i);
 618
 619         /* set find mode for completion */
 620         command_mode = FIND_EXE_ONLY;
 621         for (i = 0; int_buf[i]; i++)
 622                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 623                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 624                          && matchBuf[pos_buf[0]]=='c'
 625                          && matchBuf[pos_buf[1]]=='d'
 626                         ) {
 627                                 command_mode = FIND_DIR_ONLY;
 628                         } else {
 629                                 command_mode = FIND_FILE_ONLY;
 630                                 break;
 631                         }
 632                 }
 633         for (i = 0; int_buf[i]; i++)
 634                 /* "strlen" */;
 635         /* find last word */
 636         for (--i; i >= 0; i--) {
 637                 c = int_buf[i];
 638                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 639                         collapse_pos(0, i + 1);
 640                         break;
 641                 }
 642         }
 643         /* skip first not quoted '\'' or '"' */
 644         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 645                 /*skip*/;
 646         /* collapse quote or unquote // or /~ */
 647         while ((int_buf[i] & ~QUOT) == '/'
 648          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 649         ) {
 650                 i++;
 651         }
 652
 653         /* set only match and destroy quotes */
 654         j = 0;
 655         for (c = 0; pos_buf[i] >= 0; i++) {
 656                 matchBuf[c++] = matchBuf[pos_buf[i]];
 657                 j = pos_buf[i] + 1;
 658         }
 659         matchBuf[c] = 0;
 660         /* old lenght matchBuf with quotes symbols */
 661         *len_with_quotes = j ? j - pos_buf[0] : 0;
 662
 663         return command_mode;
 664 }
 665
 666 /*
 667  * display by column (original idea from ls applet,
 668  * very optimized by me :)
 669  */
 670 static void showfiles(void)
 671 {
 672         int ncols, row;
 673         int column_width = 0;
 674         int nfiles = num_matches;
 675         int nrows = nfiles;
 676         int l;
 677
 678         /* find the longest file name-  use that as the column width */
 679         for (row = 0; row < nrows; row++) {
 680                 l = strlen(matches[row]);
 681                 if (column_width < l)
 682                         column_width = l;
 683         }
 684         column_width += 2;              /* min space for columns */
 685         ncols = cmdedit_termw / column_width;
 686
 687         if (ncols > 1) {
 688                 nrows /= ncols;
 689                 if (nfiles % ncols)
 690                         nrows++;        /* round up fractionals */
 691         } else {
 692                 ncols = 1;
 693         }
 694         for (row = 0; row < nrows; row++) {
 695                 int n = row;
 696                 int nc;
 697
 698                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
 699                         printf("%s%-*s", matches[n],
 700                                 (int)(column_width - strlen(matches[n])), "");
 701                 }
 702                 printf("%s\n", matches[n]);
 703         }
 704 }
 705
 706 static char *add_quote_for_spec_chars(char *found)
 707 {
 708         int l = 0;
 709         char *s = xmalloc((strlen(found) + 1) * 2);
 710
 711         while (*found) {
 712                 if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found))
 713                         s[l++] = '\\';
 714                 s[l++] = *found++;
 715         }
 716         s[l] = 0;
 717         return s;
 718 }
 719
 720 static int match_compare(const void *a, const void *b)
 721 {
 722         return strcmp(*(char**)a, *(char**)b);
 723 }
 724
 725 /* Do TAB completion */
 726 static void input_tab(int *lastWasTab)
 727 {
 728         if (!(state->flags & TAB_COMPLETION))
 729                 return;
 730
 731         if (!*lastWasTab) {
 732                 char *tmp, *tmp1;
 733                 int len_found;
 734                 char matchBuf[MAX_LINELEN];
 735                 int find_type;
 736                 int recalc_pos;
 737
 738                 *lastWasTab = TRUE;             /* flop trigger */
 739
 740                 /* Make a local copy of the string -- up
 741                  * to the position of the cursor */
 742                 tmp = strncpy(matchBuf, command_ps, cursor);
 743                 tmp[cursor] = '\0';
 744
 745                 find_type = find_match(matchBuf, &recalc_pos);
 746
 747                 /* Free up any memory already allocated */
 748                 free_tab_completion_data();
 749
 750 #if ENABLE_FEATURE_USERNAME_COMPLETION
 751                 /* If the word starts with `~' and there is no slash in the word,
 752                  * then try completing this word as a username. */
 753                 if (state->flags & USERNAME_COMPLETION)
 754                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == 0)
 755                                 username_tab_completion(matchBuf, NULL);
 756 #endif
 757                 /* Try to match any executable in our path and everything
 758                  * in the current working directory */
 759                 if (!matches)
 760                         exe_n_cwd_tab_completion(matchBuf, find_type);
 761                 /* Sort, then remove any duplicates found */
 762                 if (matches) {
 763                         int i, n = 0;
 764                         qsort(matches, num_matches, sizeof(char*), match_compare);
 765                         for (i = 0; i < num_matches - 1; ++i) {
 766                                 if (matches[i] && matches[i+1]) { /* paranoia */
 767                                         if (strcmp(matches[i], matches[i+1]) == 0) {
 768                                                 free(matches[i]);
 769                                                 matches[i] = NULL; /* paranoia */
 770                                         } else {
 771                                                 matches[n++] = matches[i];
 772                                         }
 773                                 }
 774                         }
 775                         matches[n] = matches[i];
 776                         num_matches = n + 1;
 777                 }
 778                 /* Did we find exactly one match? */
 779                 if (!matches || num_matches > 1) {
 780                         beep();
 781                         if (!matches)
 782                                 return;         /* not found */
 783                         /* find minimal match */
 784                 // ash: yet another failure in trying to achieve "we don't die on OOM"
 785                         tmp1 = xstrdup(matches[0]);
 786                         for (tmp = tmp1; *tmp; tmp++)
 787                                 for (len_found = 1; len_found < num_matches; len_found++)
 788                                         if (matches[len_found][(tmp - tmp1)] != *tmp) {
 789                                                 *tmp = '\0';
 790                                                 break;
 791                                         }
 792                         if (*tmp1 == '\0') {        /* have unique */
 793                                 free(tmp1);
 794                                 return;
 795                         }
 796                         tmp = add_quote_for_spec_chars(tmp1);
 797                         free(tmp1);
 798                 } else {                        /* one match */
 799                         tmp = add_quote_for_spec_chars(matches[0]);
 800                         /* for next completion current found */
 801                         *lastWasTab = FALSE;
 802
 803                         len_found = strlen(tmp);
 804                         if (tmp[len_found-1] != '/') {
 805                                 tmp[len_found] = ' ';
 806                                 tmp[len_found+1] = '\0';
 807                         }
 808                 }
 809                 len_found = strlen(tmp);
 810                 /* have space to placed match? */
 811                 if ((len_found - strlen(matchBuf) + command_len) < MAX_LINELEN) {
 812                         /* before word for match   */
 813                         command_ps[cursor - recalc_pos] = 0;
 814                         /* save   tail line        */
 815                         strcpy(matchBuf, command_ps + cursor);
 816                         /* add    match            */
 817                         strcat(command_ps, tmp);
 818                         /* add    tail             */
 819                         strcat(command_ps, matchBuf);
 820                         /* back to begin word for match    */
 821                         input_backward(recalc_pos);
 822                         /* new pos                         */
 823                         recalc_pos = cursor + len_found;
 824                         /* new len                         */
 825                         command_len = strlen(command_ps);
 826                         /* write out the matched command   */
 827                         redraw(cmdedit_y, command_len - recalc_pos);
 828                 }
 829                 free(tmp);
 830         } else {
 831                 /* Ok -- the last char was a TAB.  Since they
 832                  * just hit TAB again, print a list of all the
 833                  * available choices... */
 834                 if (matches && num_matches > 0) {
 835                         int sav_cursor = cursor;        /* change goto_new_line() */
 836
 837                         /* Go to the next line */
 838                         goto_new_line();
 839                         showfiles();
 840                         redraw(0, command_len - sav_cursor);
 841                 }
 842         }
 843 }
 844
 845 #else
 846 #define input_tab(a) ((void)0)
 847 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
 848
 849
 850 #if MAX_HISTORY > 0
 851
 852 /* state->flags is already checked to be nonzero */
 853 static void get_previous_history(void)
 854 {
 855         if (command_ps[0] != '\0' || state->history[state->cur_history] == NULL) {
 856                 free(state->history[state->cur_history]);
 857                 state->history[state->cur_history] = xstrdup(command_ps);
 858         }
 859         state->cur_history--;
 860 }
 861
 862 static int get_next_history(void)
 863 {
 864         if (state->flags & DO_HISTORY) {
 865                 int ch = state->cur_history;
 866                 if (ch < state->cnt_history) {
 867                         get_previous_history(); /* save the current history line */
 868                         state->cur_history = ch + 1;
 869                         return state->cur_history;
 870                 }
 871         }
 872         beep();
 873         return 0;
 874 }
 875
 876 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
 877 /* state->flags is already checked to be nonzero */
 878 static void load_history(const char *fromfile)
 879 {
 880         FILE *fp;
 881         int hi;
 882
 883         /* cleanup old */
 884         for (hi = state->cnt_history; hi > 0;) {
 885                 hi--;
 886                 free(state->history[hi]);
 887         }
 888
 889         fp = fopen(fromfile, "r");
 890         if (fp) {
 891                 for (hi = 0; hi < MAX_HISTORY;) {
 892                         char *hl = xmalloc_getline(fp);
 893                         int l;
 894
 895                         if (!hl)
 896                                 break;
 897                         l = strlen(hl);
 898                         if (l >= MAX_LINELEN)
 899                                 hl[MAX_LINELEN-1] = '\0';
 900                         if (l == 0 || hl[0] == ' ') {
 901                                 free(hl);
 902                                 continue;
 903                         }
 904                         state->history[hi++] = hl;
 905                 }
 906                 fclose(fp);
 907         }
 908         state->cur_history = state->cnt_history = hi;
 909 }
 910
 911 /* state->flags is already checked to be nonzero */
 912 static void save_history(const char *tofile)
 913 {
 914         FILE *fp;
 915
 916         fp = fopen(tofile, "w");
 917         if (fp) {
 918                 int i;
 919
 920                 for (i = 0; i < state->cnt_history; i++) {
 921                         fprintf(fp, "%s\n", state->history[i]);
 922                 }
 923                 fclose(fp);
 924         }
 925 }
 926 #else
 927 #define load_history(a) ((void)0)
 928 #define save_history(a) ((void)0)
 929 #endif /* FEATURE_COMMAND_SAVEHISTORY */
 930
 931 static void remember_in_history(const char *str)
 932 {
 933         int i;
 934
 935         if (!(state->flags & DO_HISTORY))
 936                 return;
 937
 938         i = state->cnt_history;
 939         free(state->history[MAX_HISTORY]);
 940         state->history[MAX_HISTORY] = NULL;
 941         /* After max history, remove the oldest command */
 942         if (i >= MAX_HISTORY) {
 943                 free(state->history[0]);
 944                 for (i = 0; i < MAX_HISTORY-1; i++)
 945                         state->history[i] = state->history[i+1];
 946         }
 947 // Maybe "if (!i || strcmp(history[i-1], command) != 0) ..."
 948 // (i.e. do not save dups?)
 949         state->history[i++] = xstrdup(str);
 950         state->cur_history = i;
 951         state->cnt_history = i;
 952 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
 953         if ((state->flags & SAVE_HISTORY) && state->hist_file)
 954                 save_history(state->hist_file);
 955 #endif
 956         USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
 957 }
 958
 959 #else /* MAX_HISTORY == 0 */
 960 #define remember_in_history(a) ((void)0)
 961 #endif /* MAX_HISTORY */
 962
 963
 964 /*
 965  * This function is used to grab a character buffer
 966  * from the input file descriptor and allows you to
 967  * a string with full command editing (sort of like
 968  * a mini readline).
 969  *
 970  * The following standard commands are not implemented:
 971  * ESC-b -- Move back one word
 972  * ESC-f -- Move forward one word
 973  * ESC-d -- Delete back one word
 974  * ESC-h -- Delete forward one word
 975  * CTL-t -- Transpose two characters
 976  *
 977  * Minimalist vi-style command line editing available if configured.
 978  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
 979  */
 980
 981 #if ENABLE_FEATURE_EDITING_VI
 982 static void
 983 vi_Word_motion(char *command, int eat)
 984 {
 985         while (cursor < command_len && !isspace(command[cursor]))
 986                 input_forward();
 987         if (eat) while (cursor < command_len && isspace(command[cursor]))
 988                 input_forward();
 989 }
 990
 991 static void
 992 vi_word_motion(char *command, int eat)
 993 {
 994         if (isalnum(command[cursor]) || command[cursor] == '_') {
 995                 while (cursor < command_len
 996                  && (isalnum(command[cursor+1]) || command[cursor+1] == '_'))
 997                         input_forward();
 998         } else if (ispunct(command[cursor])) {
 999                 while (cursor < command_len && ispunct(command[cursor+1]))
1000                         input_forward();
1001         }
1002
1003         if (cursor < command_len)
1004                 input_forward();
1005
1006         if (eat && cursor < command_len && isspace(command[cursor]))
1007                 while (cursor < command_len && isspace(command[cursor]))
1008                         input_forward();
1009 }
1010
1011 static void
1012 vi_End_motion(char *command)
1013 {
1014         input_forward();
1015         while (cursor < command_len && isspace(command[cursor]))
1016                 input_forward();
1017         while (cursor < command_len-1 && !isspace(command[cursor+1]))
1018                 input_forward();
1019 }
1020
1021 static void
1022 vi_end_motion(char *command)
1023 {
1024         if (cursor >= command_len-1)
1025                 return;
1026         input_forward();
1027         while (cursor < command_len-1 && isspace(command[cursor]))
1028                 input_forward();
1029         if (cursor >= command_len-1)
1030                 return;
1031         if (isalnum(command[cursor]) || command[cursor] == '_') {
1032                 while (cursor < command_len-1
1033                  && (isalnum(command[cursor+1]) || command[cursor+1] == '_')
1034                 ) {
1035                         input_forward();
1036                 }
1037         } else if (ispunct(command[cursor])) {
1038                 while (cursor < command_len-1 && ispunct(command[cursor+1]))
1039                         input_forward();
1040         }
1041 }
1042
1043 static void
1044 vi_Back_motion(char *command)
1045 {
1046         while (cursor > 0 && isspace(command[cursor-1]))
1047                 input_backward(1);
1048         while (cursor > 0 && !isspace(command[cursor-1]))
1049                 input_backward(1);
1050 }
1051
1052 static void
1053 vi_back_motion(char *command)
1054 {
1055         if (cursor <= 0)
1056                 return;
1057         input_backward(1);
1058         while (cursor > 0 && isspace(command[cursor]))
1059                 input_backward(1);
1060         if (cursor <= 0)
1061                 return;
1062         if (isalnum(command[cursor]) || command[cursor] == '_') {
1063                 while (cursor > 0
1064                  && (isalnum(command[cursor-1]) || command[cursor-1] == '_')
1065                 ) {
1066                         input_backward(1);
1067                 }
1068         } else if (ispunct(command[cursor])) {
1069                 while (cursor > 0 && ispunct(command[cursor-1]))
1070                         input_backward(1);
1071         }
1072 }
1073 #endif
1074
1075
1076 /*
1077  * read_line_input and its helpers
1078  */
1079
1080 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1081 static void parse_prompt(const char *prmt_ptr)
1082 {
1083         cmdedit_prompt = prmt_ptr;
1084         cmdedit_prmt_len = strlen(prmt_ptr);
1085         put_prompt();
1086 }
1087 #else
1088 static void parse_prompt(const char *prmt_ptr)
1089 {
1090         int prmt_len = 0;
1091         size_t cur_prmt_len = 0;
1092         char flg_not_length = '[';
1093         char *prmt_mem_ptr = xzalloc(1);
1094         char *pwd_buf = xrealloc_getcwd_or_warn(NULL);
1095         char buf2[PATH_MAX + 1];
1096         char buf[2];
1097         char c;
1098         char *pbuf;
1099
1100         cmdedit_prmt_len = 0;
1101
1102         if (!pwd_buf) {
1103                 pwd_buf = (char *)bb_msg_unknown;
1104         }
1105
1106         while (*prmt_ptr) {
1107                 pbuf = buf;
1108                 pbuf[1] = 0;
1109                 c = *prmt_ptr++;
1110                 if (c == '\\') {
1111                         const char *cp = prmt_ptr;
1112                         int l;
1113
1114                         c = bb_process_escape_sequence(&prmt_ptr);
1115                         if (prmt_ptr == cp) {
1116                                 if (*cp == 0)
1117                                         break;
1118                                 c = *prmt_ptr++;
1119                                 switch (c) {
1120 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1121                                 case 'u':
1122                                         pbuf = user_buf;
1123                                         break;
1124 #endif
1125                                 case 'h':
1126                                         pbuf = hostname_buf;
1127                                         if (!pbuf) {
1128                                                 pbuf = xzalloc(256);
1129                                                 if (gethostname(pbuf, 255) < 0) {
1130                                                         strcpy(pbuf, "?");
1131                                                 } else {
1132                                                         char *s = strchr(pbuf, '.');
1133                                                         if (s)
1134                                                                 *s = '\0';
1135                                                 }
1136                                                 hostname_buf = pbuf;
1137                                         }
1138                                         break;
1139                                 case '$':
1140                                         c = (geteuid() == 0 ? '#' : '$');
1141                                         break;
1142 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1143                                 case 'w':
1144                                         pbuf = pwd_buf;
1145                                         l = strlen(home_pwd_buf);
1146                                         if (home_pwd_buf[0] != 0
1147                                          && strncmp(home_pwd_buf, pbuf, l) == 0
1148                                          && (pbuf[l]=='/' || pbuf[l]=='\0')
1149                                          && strlen(pwd_buf+l)<PATH_MAX
1150                                         ) {
1151                                                 pbuf = buf2;
1152                                                 *pbuf = '~';
1153                                                 strcpy(pbuf+1, pwd_buf+l);
1154                                         }
1155                                         break;
1156 #endif
1157                                 case 'W':
1158                                         pbuf = pwd_buf;
1159                                         cp = strrchr(pbuf, '/');
1160                                         if (cp != NULL && cp != pbuf)
1161                                                 pbuf += (cp-pbuf) + 1;
1162                                         break;
1163                                 case '!':
1164                                         pbuf = buf2;
1165                                         snprintf(buf2, sizeof(buf2), "%d", num_ok_lines);
1166                                         break;
1167                                 case 'e': case 'E':     /* \e \E = \033 */
1168                                         c = '\033';
1169                                         break;
1170                                 case 'x': case 'X':
1171                                         for (l = 0; l < 3;) {
1172                                                 int h;
1173                                                 buf2[l++] = *prmt_ptr;
1174                                                 buf2[l] = 0;
1175                                                 h = strtol(buf2, &pbuf, 16);
1176                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1177                                                         l--;
1178                                                         break;
1179                                                 }
1180                                                 prmt_ptr++;
1181                                         }
1182                                         buf2[l] = 0;
1183                                         c = (char)strtol(buf2, NULL, 16);
1184                                         if (c == 0)
1185                                                 c = '?';
1186                                         pbuf = buf;
1187                                         break;
1188                                 case '[': case ']':
1189                                         if (c == flg_not_length) {
1190                                                 flg_not_length = flg_not_length == '[' ? ']' : '[';
1191                                                 continue;
1192                                         }
1193                                         break;
1194                                 }
1195                         }
1196                 }
1197                 if (pbuf == buf)
1198                         *pbuf = c;
1199                 cur_prmt_len = strlen(pbuf);
1200                 prmt_len += cur_prmt_len;
1201                 if (flg_not_length != ']')
1202                         cmdedit_prmt_len += cur_prmt_len;
1203                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1204         }
1205         if (pwd_buf != (char *)bb_msg_unknown)
1206                 free(pwd_buf);
1207         cmdedit_prompt = prmt_mem_ptr;
1208         put_prompt();
1209 }
1210 #endif
1211
1212 #define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
1213 #define getTermSettings(fd, argp) tcgetattr(fd, argp);
1214
1215 static sighandler_t previous_SIGWINCH_handler;
1216
1217 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1218 {
1219         cmdedit_termw = w;
1220         if (redraw_flg) {
1221                 /* new y for current cursor */
1222                 int new_y = (cursor + cmdedit_prmt_len) / w;
1223                 /* redraw */
1224                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1225                 fflush(stdout);
1226         }
1227 }
1228
1229 static void win_changed(int nsig)
1230 {
1231         int width;
1232         get_terminal_width_height(0, &width, NULL);
1233         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1234         if (nsig == SIGWINCH)
1235                 signal(SIGWINCH, win_changed); /* rearm ourself */
1236 }
1237
1238 /*
1239  * The emacs and vi modes share much of the code in the big
1240  * command loop.  Commands entered when in vi's command mode (aka
1241  * "escape mode") get an extra bit added to distinguish them --
1242  * this keeps them from being self-inserted.  This clutters the
1243  * big switch a bit, but keeps all the code in one place.
1244  */
1245
1246 #define vbit 0x100
1247
1248 /* leave out the "vi-mode"-only case labels if vi editing isn't
1249  * configured. */
1250 #define vi_case(caselabel) USE_FEATURE_EDITING(case caselabel)
1251
1252 /* convert uppercase ascii to equivalent control char, for readability */
1253 #undef CTRL
1254 #define CTRL(a) ((a) & ~0x40)
1255
1256 int read_line_input(const char* prompt, char* command, int maxsize, line_input_t *st)
1257 {
1258         int lastWasTab = FALSE;
1259         unsigned int ic;
1260         unsigned char c;
1261         smallint break_out = 0;
1262 #if ENABLE_FEATURE_EDITING_VI
1263         smallint vi_cmdmode = 0;
1264         smalluint prevc;
1265 #endif
1266
1267 // FIXME: audit & improve this
1268         if (maxsize > MAX_LINELEN)
1269                 maxsize = MAX_LINELEN;
1270
1271         /* With null flags, no other fields are ever used */
1272         state = st ? st : (line_input_t*) &const_int_0;
1273 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1274         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1275                 load_history(state->hist_file);
1276 #endif
1277
1278         /* prepare before init handlers */
1279         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1280         command_len = 0;
1281         command_ps = command;
1282         command[0] = '\0';
1283
1284         getTermSettings(0, (void *) &initial_settings);
1285         memcpy(&new_settings, &initial_settings, sizeof(new_settings));
1286         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1287         /* Turn off echoing and CTRL-C, so we can trap it */
1288         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1289         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1290         new_settings.c_cc[VMIN] = 1;
1291         new_settings.c_cc[VTIME] = 0;
1292         /* Turn off CTRL-C, so we can trap it */
1293 #ifndef _POSIX_VDISABLE
1294 #define _POSIX_VDISABLE '\0'
1295 #endif
1296         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1297         setTermSettings(0, (void *) &new_settings);
1298
1299         /* Now initialize things */
1300         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1301         win_changed(0); /* do initial resizing */
1302 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1303         {
1304                 struct passwd *entry;
1305
1306                 entry = getpwuid(geteuid());
1307                 if (entry) {
1308                         user_buf = xstrdup(entry->pw_name);
1309                         home_pwd_buf = xstrdup(entry->pw_dir);
1310                 }
1311         }
1312 #endif
1313         /* Print out the command prompt */
1314         parse_prompt(prompt);
1315
1316         while (1) {
1317                 fflush(stdout);
1318
1319                 if (safe_read(0, &c, 1) < 1) {
1320                         /* if we can't read input then exit */
1321                         goto prepare_to_die;
1322                 }
1323
1324                 ic = c;
1325
1326 #if ENABLE_FEATURE_EDITING_VI
1327                 newdelflag = 1;
1328                 if (vi_cmdmode)
1329                         ic |= vbit;
1330 #endif
1331                 switch (ic) {
1332                 case '\n':
1333                 case '\r':
1334                 vi_case('\n'|vbit:)
1335                 vi_case('\r'|vbit:)
1336                         /* Enter */
1337                         goto_new_line();
1338                         break_out = 1;
1339                         break;
1340 #if ENABLE_FEATURE_EDITING_FANCY_KEYS
1341                 case CTRL('A'):
1342                 vi_case('0'|vbit:)
1343                         /* Control-a -- Beginning of line */
1344                         input_backward(cursor);
1345                         break;
1346                 case CTRL('B'):
1347                 vi_case('h'|vbit:)
1348                 vi_case('\b'|vbit:)
1349                 vi_case('\x7f'|vbit:) /* DEL */
1350                         /* Control-b -- Move back one character */
1351                         input_backward(1);
1352                         break;
1353 #endif
1354                 case CTRL('C'):
1355                 vi_case(CTRL('C')|vbit:)
1356                         /* Control-c -- stop gathering input */
1357                         goto_new_line();
1358                         command_len = 0;
1359                         break_out = -1; /* "do not append '\n'" */
1360                         break;
1361                 case CTRL('D'):
1362                         /* Control-d -- Delete one character, or exit
1363                          * if the len=0 and no chars to delete */
1364                         if (command_len == 0) {
1365                                 errno = 0;
1366  prepare_to_die:
1367                                 /* to control stopped jobs */
1368                                 break_out = command_len = -1;
1369                                 break;
1370                         }
1371                         input_delete(0);
1372                         break;
1373
1374 #if ENABLE_FEATURE_EDITING_FANCY_KEYS
1375                 case CTRL('E'):
1376                 vi_case('$'|vbit:)
1377                         /* Control-e -- End of line */
1378                         input_end();
1379                         break;
1380                 case CTRL('F'):
1381                 vi_case('l'|vbit:)
1382                 vi_case(' '|vbit:)
1383                         /* Control-f -- Move forward one character */
1384                         input_forward();
1385                         break;
1386 #endif
1387
1388                 case '\b':
1389                 case '\x7f': /* DEL */
1390                         /* Control-h and DEL */
1391                         input_backspace();
1392                         break;
1393
1394                 case '\t':
1395                         input_tab(&lastWasTab);
1396                         break;
1397
1398 #if ENABLE_FEATURE_EDITING_FANCY_KEYS
1399                 case CTRL('K'):
1400                         /* Control-k -- clear to end of line */
1401                         command[cursor] = 0;
1402                         command_len = cursor;
1403                         printf("\033[J");
1404                         break;
1405                 case CTRL('L'):
1406                 vi_case(CTRL('L')|vbit:)
1407                         /* Control-l -- clear screen */
1408                         printf("\033[H");
1409                         redraw(0, command_len - cursor);
1410                         break;
1411 #endif
1412
1413 #if MAX_HISTORY > 0
1414                 case CTRL('N'):
1415                 vi_case(CTRL('N')|vbit:)
1416                 vi_case('j'|vbit:)
1417                         /* Control-n -- Get next command in history */
1418                         if (get_next_history())
1419                                 goto rewrite_line;
1420                         break;
1421                 case CTRL('P'):
1422                 vi_case(CTRL('P')|vbit:)
1423                 vi_case('k'|vbit:)
1424                         /* Control-p -- Get previous command from history */
1425                         if ((state->flags & DO_HISTORY) && state->cur_history > 0) {
1426                                 get_previous_history();
1427                                 goto rewrite_line;
1428                         }
1429                         beep();
1430                         break;
1431 #endif
1432
1433 #if ENABLE_FEATURE_EDITING_FANCY_KEYS
1434                 case CTRL('U'):
1435                 vi_case(CTRL('U')|vbit:)
1436                         /* Control-U -- Clear line before cursor */
1437                         if (cursor) {
1438                                 strcpy(command, command + cursor);
1439                                 command_len -= cursor;
1440                                 redraw(cmdedit_y, command_len);
1441                         }
1442                         break;
1443 #endif
1444                 case CTRL('W'):
1445                 vi_case(CTRL('W')|vbit:)
1446                         /* Control-W -- Remove the last word */
1447                         while (cursor > 0 && isspace(command[cursor-1]))
1448                                 input_backspace();
1449                         while (cursor > 0 && !isspace(command[cursor-1]))
1450                                 input_backspace();
1451                         break;
1452
1453 #if ENABLE_FEATURE_EDITING_VI
1454                 case 'i'|vbit:
1455                         vi_cmdmode = 0;
1456                         break;
1457                 case 'I'|vbit:
1458                         input_backward(cursor);
1459                         vi_cmdmode = 0;
1460                         break;
1461                 case 'a'|vbit:
1462                         input_forward();
1463                         vi_cmdmode = 0;
1464                         break;
1465                 case 'A'|vbit:
1466                         input_end();
1467                         vi_cmdmode = 0;
1468                         break;
1469                 case 'x'|vbit:
1470                         input_delete(1);
1471                         break;
1472                 case 'X'|vbit:
1473                         if (cursor > 0) {
1474                                 input_backward(1);
1475                                 input_delete(1);
1476                         }
1477                         break;
1478                 case 'W'|vbit:
1479                         vi_Word_motion(command, 1);
1480                         break;
1481                 case 'w'|vbit:
1482                         vi_word_motion(command, 1);
1483                         break;
1484                 case 'E'|vbit:
1485                         vi_End_motion(command);
1486                         break;
1487                 case 'e'|vbit:
1488                         vi_end_motion(command);
1489                         break;
1490                 case 'B'|vbit:
1491                         vi_Back_motion(command);
1492                         break;
1493                 case 'b'|vbit:
1494                         vi_back_motion(command);
1495                         break;
1496                 case 'C'|vbit:
1497                         vi_cmdmode = 0;
1498                         /* fall through */
1499                 case 'D'|vbit:
1500                         goto clear_to_eol;
1501
1502                 case 'c'|vbit:
1503                         vi_cmdmode = 0;
1504                         /* fall through */
1505                 case 'd'|vbit: {
1506                         int nc, sc;
1507                         sc = cursor;
1508                         prevc = ic;
1509                         if (safe_read(0, &c, 1) < 1)
1510                                 goto prepare_to_die;
1511                         if (c == (prevc & 0xff)) {
1512                                 /* "cc", "dd" */
1513                                 input_backward(cursor);
1514                                 goto clear_to_eol;
1515                                 break;
1516                         }
1517                         switch (c) {
1518                         case 'w':
1519                         case 'W':
1520                         case 'e':
1521                         case 'E':
1522                                 switch (c) {
1523                                 case 'w':   /* "dw", "cw" */
1524                                         vi_word_motion(command, vi_cmdmode);
1525                                         break;
1526                                 case 'W':   /* 'dW', 'cW' */
1527                                         vi_Word_motion(command, vi_cmdmode);
1528                                         break;
1529                                 case 'e':   /* 'de', 'ce' */
1530                                         vi_end_motion(command);
1531                                         input_forward();
1532                                         break;
1533                                 case 'E':   /* 'dE', 'cE' */
1534                                         vi_End_motion(command);
1535                                         input_forward();
1536                                         break;
1537                                 }
1538                                 nc = cursor;
1539                                 input_backward(cursor - sc);
1540                                 while (nc-- > cursor)
1541                                         input_delete(1);
1542                                 break;
1543                         case 'b':  /* "db", "cb" */
1544                         case 'B':  /* implemented as B */
1545                                 if (c == 'b')
1546                                         vi_back_motion(command);
1547                                 else
1548                                         vi_Back_motion(command);
1549                                 while (sc-- > cursor)
1550                                         input_delete(1);
1551                                 break;
1552                         case ' ':  /* "d ", "c " */
1553                                 input_delete(1);
1554                                 break;
1555                         case '$':  /* "d$", "c$" */
1556                         clear_to_eol:
1557                                 while (cursor < command_len)
1558                                         input_delete(1);
1559                                 break;
1560                         }
1561                         break;
1562                 }
1563                 case 'p'|vbit:
1564                         input_forward();
1565                         /* fallthrough */
1566                 case 'P'|vbit:
1567                         put();
1568                         break;
1569                 case 'r'|vbit:
1570                         if (safe_read(0, &c, 1) < 1)
1571                                 goto prepare_to_die;
1572                         if (c == 0)
1573                                 beep();
1574                         else {
1575                                 *(command + cursor) = c;
1576                                 putchar(c);
1577                                 putchar('\b');
1578                         }
1579                         break;
1580 #endif /* FEATURE_COMMAND_EDITING_VI */
1581
1582                 case '\x1b': /* ESC */
1583
1584 #if ENABLE_FEATURE_EDITING_VI
1585                         if (state->flags & VI_MODE) {
1586                                 /* ESC: insert mode --> command mode */
1587                                 vi_cmdmode = 1;
1588                                 input_backward(1);
1589                                 break;
1590                         }
1591 #endif
1592                         /* escape sequence follows */
1593                         if (safe_read(0, &c, 1) < 1)
1594                                 goto prepare_to_die;
1595                         /* different vt100 emulations */
1596                         if (c == '[' || c == 'O') {
1597                 vi_case('['|vbit:)
1598                 vi_case('O'|vbit:)
1599                                 if (safe_read(0, &c, 1) < 1)
1600                                         goto prepare_to_die;
1601                         }
1602                         if (c >= '1' && c <= '9') {
1603                                 unsigned char dummy;
1604
1605                                 if (safe_read(0, &dummy, 1) < 1)
1606                                         goto prepare_to_die;
1607                                 if (dummy != '~')
1608                                         c = '\0';
1609                         }
1610
1611                         switch (c) {
1612 #if ENABLE_FEATURE_TAB_COMPLETION
1613                         case '\t':                      /* Alt-Tab */
1614                                 input_tab(&lastWasTab);
1615                                 break;
1616 #endif
1617 #if MAX_HISTORY > 0
1618                         case 'A':
1619                                 /* Up Arrow -- Get previous command from history */
1620                                 if ((state->flags & DO_HISTORY) && state->cur_history > 0) {
1621                                         get_previous_history();
1622                                         goto rewrite_line;
1623                                 }
1624                                 beep();
1625                                 break;
1626                         case 'B':
1627                                 /* Down Arrow -- Get next command in history */
1628                                 if (!get_next_history())
1629                                         break;
1630  rewrite_line:
1631                                 /* Rewrite the line with the selected history item */
1632                                 /* change command */
1633                                 command_len = strlen(strcpy(command, state->history[state->cur_history]));
1634                                 /* redraw and go to eol (bol, in vi */
1635                                 redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
1636                                 break;
1637 #endif
1638                         case 'C':
1639                                 /* Right Arrow -- Move forward one character */
1640                                 input_forward();
1641                                 break;
1642                         case 'D':
1643                                 /* Left Arrow -- Move back one character */
1644                                 input_backward(1);
1645                                 break;
1646                         case '3':
1647                                 /* Delete */
1648                                 input_delete(0);
1649                                 break;
1650                         case '1': // vt100? linux vt? or what?
1651                         case '7': // vt100? linux vt? or what?
1652                         case 'H': /* xterm's <Home> */
1653                                 input_backward(cursor);
1654                                 break;
1655                         case '4': // vt100? linux vt? or what?
1656                         case '8': // vt100? linux vt? or what?
1657                         case 'F': /* xterm's <End> */
1658                                 input_end();
1659                                 break;
1660                         default:
1661                                 c = '\0';
1662                                 beep();
1663                         }
1664                         break;
1665
1666                 default:        /* If it's regular input, do the normal thing */
1667 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
1668                         /* Control-V -- Add non-printable symbol */
1669                         if (c == CTRL('V')) {
1670                                 if (safe_read(0, &c, 1) < 1)
1671                                         goto prepare_to_die;
1672                                 if (c == 0) {
1673                                         beep();
1674                                         break;
1675                                 }
1676                         } else
1677 #endif
1678
1679 #if ENABLE_FEATURE_EDITING_VI
1680                         if (vi_cmdmode)  /* Don't self-insert */
1681                                 break;
1682 #endif
1683                         if (!Isprint(c)) /* Skip non-printable characters */
1684                                 break;
1685
1686                         if (command_len >= (maxsize - 2))        /* Need to leave space for enter */
1687                                 break;
1688
1689                         command_len++;
1690                         if (cursor == (command_len - 1)) {      /* Append if at the end of the line */
1691                                 command[cursor] = c;
1692                                 command[cursor+1] = '\0';
1693                                 cmdedit_set_out_char(' ');
1694                         } else {                        /* Insert otherwise */
1695                                 int sc = cursor;
1696
1697                                 memmove(command + sc + 1, command + sc, command_len - sc);
1698                                 command[sc] = c;
1699                                 sc++;
1700                                 /* rewrite from cursor */
1701                                 input_end();
1702                                 /* to prev x pos + 1 */
1703                                 input_backward(cursor - sc);
1704                         }
1705                         break;
1706                 }
1707                 if (break_out)                  /* Enter is the command terminator, no more input. */
1708                         break;
1709
1710                 if (c != '\t')
1711                         lastWasTab = FALSE;
1712         }
1713
1714         if (command_len > 0)
1715                 remember_in_history(command);
1716
1717         if (break_out > 0) {
1718                 command[command_len++] = '\n';
1719                 command[command_len] = '\0';
1720         }
1721
1722 #if ENABLE_FEATURE_CLEAN_UP && ENABLE_FEATURE_TAB_COMPLETION
1723         free_tab_completion_data();
1724 #endif
1725
1726 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
1727         free((char*)cmdedit_prompt);
1728 #endif
1729         /* restore initial_settings */
1730         setTermSettings(STDIN_FILENO, (void *) &initial_settings);
1731         /* restore SIGWINCH handler */
1732         signal(SIGWINCH, previous_SIGWINCH_handler);
1733         fflush(stdout);
1734         return command_len;
1735 }
1736
1737 line_input_t *new_line_input_t(int flags)
1738 {
1739         line_input_t *n = xzalloc(sizeof(*n));
1740         n->flags = flags;
1741         return n;
1742 }
1743
1744 #else
1745
1746 #undef read_line_input
1747 int read_line_input(const char* prompt, char* command, int maxsize)
1748 {
1749         fputs(prompt, stdout);
1750         fflush(stdout);
1751         fgets(command, maxsize, stdin);
1752         return strlen(command);
1753 }
1754
1755 #endif  /* FEATURE_COMMAND_EDITING */
1756
1757
1758 /*
1759  * Testing
1760  */
1761
1762 #ifdef TEST
1763
1764 #include <locale.h>
1765
1766 const char *applet_name = "debug stuff usage";
1767
1768 int main(int argc, char **argv)
1769 {
1770         char buff[MAX_LINELEN];
1771         char *prompt =
1772 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
1773                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
1774                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
1775                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
1776 #else
1777                 "% ";
1778 #endif
1779
1780 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
1781         setlocale(LC_ALL, "");
1782 #endif
1783         while (1) {
1784                 int l;
1785                 l = read_line_input(prompt, buff);
1786                 if (l <= 0 || buff[l-1] != '\n')
1787                         break;
1788                 buff[l-1] = 0;
1789                 printf("*** read_line_input() returned line =%s=\n", buff);
1790         }
1791         printf("*** read_line_input() detect ^D\n");
1792         return 0;
1793 }
1794
1795 #endif  /* TEST */