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  * lineedit does not know that the terminal escape sequences do not
  26  * take up space on the screen. The redisplay code assumes, unless
  27  * told otherwise, that each character in the prompt is a printable
  28  * character that takes up one character position on the screen.
  29  * You need to tell lineedit that some sequences of characters
  30  * in the prompt take up no screen space. Compatibly with readline,
  31  * use the \[ escape to begin a sequence of non-printing characters,
  32  * and the \] escape to signal the end of such a sequence. Example:
  33  *
  34  * PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
  35  */
  36
  37 #include "libbb.h"
  38
  39
  40 /* FIXME: obsolete CONFIG item? */
  41 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  42
  43
  44 #ifdef TEST
  45
  46 #define ENABLE_FEATURE_EDITING 0
  47 #define ENABLE_FEATURE_TAB_COMPLETION 0
  48 #define ENABLE_FEATURE_USERNAME_COMPLETION 0
  49 #define ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT 0
  50
  51 #endif  /* TEST */
  52
  53
  54 /* Entire file (except TESTing part) sits inside this #if */
  55 #if ENABLE_FEATURE_EDITING
  56
  57 #if ENABLE_LOCALE_SUPPORT
  58 #define Isprint(c) isprint(c)
  59 #else
  60 #define Isprint(c) ((c) >= ' ' && (c) != ((unsigned char)'\233'))
  61 #endif
  62
  63 #define ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR \
  64         (ENABLE_FEATURE_USERNAME_COMPLETION || ENABLE_FEATURE_EDITING_FANCY_PROMPT)
  65 #define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...)
  66 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  67 #undef USE_FEATURE_GETUSERNAME_AND_HOMEDIR
  68 #define USE_FEATURE_GETUSERNAME_AND_HOMEDIR(...) __VA_ARGS__
  69 #endif
  70
  71 enum {
  72         /* We use int16_t for positions, need to limit line len */
  73         MAX_LINELEN = CONFIG_FEATURE_EDITING_MAX_LEN < 0x7ff0
  74                       ? CONFIG_FEATURE_EDITING_MAX_LEN
  75                       : 0x7ff0
  76 };
  77
  78 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
  79 static const char null_str[] ALIGN1 = "";
  80 #endif
  81
  82 /* We try to minimize both static and stack usage. */
  83 struct lineedit_statics {
  84         line_input_t *state;
  85
  86         volatile unsigned cmdedit_termw; /* = 80; */ /* actual terminal width */
  87         sighandler_t previous_SIGWINCH_handler;
  88
  89         unsigned cmdedit_x;        /* real x terminal position */
  90         unsigned cmdedit_y;        /* pseudoreal y terminal position */
  91         unsigned cmdedit_prmt_len; /* length of prompt (without colors etc) */
  92
  93         unsigned cursor;
  94         unsigned command_len;
  95         char *command_ps;
  96
  97         const char *cmdedit_prompt;
  98 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
  99         int num_ok_lines; /* = 1; */
 100 #endif
 101
 102 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 103         char *user_buf;
 104         char *home_pwd_buf; /* = (char*)null_str; */
 105 #endif
 106
 107 #if ENABLE_FEATURE_TAB_COMPLETION
 108         char **matches;
 109         unsigned num_matches;
 110 #endif
 111
 112 #if ENABLE_FEATURE_EDITING_VI
 113 #define DELBUFSIZ 128
 114         char *delptr;
 115         smallint newdelflag;     /* whether delbuf should be reused yet */
 116         char delbuf[DELBUFSIZ];  /* a place to store deleted characters */
 117 #endif
 118
 119         /* Formerly these were big buffers on stack: */
 120 #if ENABLE_FEATURE_TAB_COMPLETION
 121         char exe_n_cwd_tab_completion__dirbuf[MAX_LINELEN];
 122         char input_tab__matchBuf[MAX_LINELEN];
 123         int16_t find_match__int_buf[MAX_LINELEN + 1]; /* need to have 9 bits at least */
 124         int16_t find_match__pos_buf[MAX_LINELEN + 1];
 125 #endif
 126 };
 127
 128 /* See lineedit_ptr_hack.c */
 129 extern struct lineedit_statics *const lineedit_ptr_to_statics;
 130
 131 #define S (*lineedit_ptr_to_statics)
 132 #define state            (S.state           )
 133 #define cmdedit_termw    (S.cmdedit_termw   )
 134 #define previous_SIGWINCH_handler (S.previous_SIGWINCH_handler)
 135 #define cmdedit_x        (S.cmdedit_x       )
 136 #define cmdedit_y        (S.cmdedit_y       )
 137 #define cmdedit_prmt_len (S.cmdedit_prmt_len)
 138 #define cursor           (S.cursor          )
 139 #define command_len      (S.command_len     )
 140 #define command_ps       (S.command_ps      )
 141 #define cmdedit_prompt   (S.cmdedit_prompt  )
 142 #define num_ok_lines     (S.num_ok_lines    )
 143 #define user_buf         (S.user_buf        )
 144 #define home_pwd_buf     (S.home_pwd_buf    )
 145 #define matches          (S.matches         )
 146 #define num_matches      (S.num_matches     )
 147 #define delptr           (S.delptr          )
 148 #define newdelflag       (S.newdelflag      )
 149 #define delbuf           (S.delbuf          )
 150
 151 #define INIT_S() do { \
 152         (*(struct lineedit_statics**)&lineedit_ptr_to_statics) = xzalloc(sizeof(S)); \
 153         barrier(); \
 154         cmdedit_termw = 80; \
 155         USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines = 1;) \
 156         USE_FEATURE_GETUSERNAME_AND_HOMEDIR(home_pwd_buf = (char*)null_str;) \
 157 } while (0)
 158 static void deinit_S(void)
 159 {
 160 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
 161         /* This one is allocated only if FANCY_PROMPT is on
 162          * (otherwise it points to verbatim prompt (NOT malloced) */
 163         free((char*)cmdedit_prompt);
 164 #endif
 165 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 166         free(user_buf);
 167         if (home_pwd_buf != null_str)
 168                 free(home_pwd_buf);
 169 #endif
 170         free(lineedit_ptr_to_statics);
 171 }
 172 #define DEINIT_S() deinit_S()
 173
 174
 175 /* Put 'command_ps[cursor]', cursor++.
 176  * Advance cursor on screen. If we reached right margin, scroll text up
 177  * and remove terminal margin effect by printing 'next_char' */
 178 #define HACK_FOR_WRONG_WIDTH 1
 179 #if HACK_FOR_WRONG_WIDTH
 180 static void cmdedit_set_out_char(void)
 181 #define cmdedit_set_out_char(next_char) cmdedit_set_out_char()
 182 #else
 183 static void cmdedit_set_out_char(int next_char)
 184 #endif
 185 {
 186         int c = (unsigned char)command_ps[cursor];
 187
 188         if (c == '\0') {
 189                 /* erase character after end of input string */
 190                 c = ' ';
 191         }
 192 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 193         /* Display non-printable characters in reverse */
 194         if (!Isprint(c)) {
 195                 if (c >= 128)
 196                         c -= 128;
 197                 if (c < ' ')
 198                         c += '@';
 199                 if (c == 127)
 200                         c = '?';
 201                 printf("\033[7m%c\033[0m", c);
 202         } else
 203 #endif
 204         {
 205                 bb_putchar(c);
 206         }
 207         if (++cmdedit_x >= cmdedit_termw) {
 208                 /* terminal is scrolled down */
 209                 cmdedit_y++;
 210                 cmdedit_x = 0;
 211 #if HACK_FOR_WRONG_WIDTH
 212                 /* This works better if our idea of term width is wrong
 213                  * and it is actually wider (often happens on serial lines).
 214                  * Printing CR,LF *forces* cursor to next line.
 215                  * OTOH if terminal width is correct AND terminal does NOT
 216                  * have automargin (IOW: it is moving cursor to next line
 217                  * by itself (which is wrong for VT-10x terminals)),
 218                  * this will break things: there will be one extra empty line */
 219                 puts("\r"); /* + implicit '\n' */
 220 #else
 221                 /* Works ok only if cmdedit_termw is correct */
 222                 /* destroy "(auto)margin" */
 223                 bb_putchar(next_char);
 224                 bb_putchar('\b');
 225 #endif
 226         }
 227 // Huh? What if command_ps[cursor] == '\0' (we are at the end already?)
 228         cursor++;
 229 }
 230
 231 /* Move to end of line (by printing all chars till the end) */
 232 static void input_end(void)
 233 {
 234         while (cursor < command_len)
 235                 cmdedit_set_out_char(' ');
 236 }
 237
 238 /* Go to the next line */
 239 static void goto_new_line(void)
 240 {
 241         input_end();
 242         if (cmdedit_x)
 243                 bb_putchar('\n');
 244 }
 245
 246
 247 static void out1str(const char *s)
 248 {
 249         if (s)
 250                 fputs(s, stdout);
 251 }
 252
 253 static void beep(void)
 254 {
 255         bb_putchar('\007');
 256 }
 257
 258 /* Move back one character */
 259 /* (optimized for slow terminals) */
 260 static void input_backward(unsigned num)
 261 {
 262         int count_y;
 263
 264         if (num > cursor)
 265                 num = cursor;
 266         if (!num)
 267                 return;
 268         cursor -= num;
 269
 270         if (cmdedit_x >= num) {
 271                 cmdedit_x -= num;
 272                 if (num <= 4) {
 273                         /* This is longer by 5 bytes on x86.
 274                          * Also gets miscompiled for ARM users
 275                          * (busybox.net/bugs/view.php?id=2274).
 276                          * printf(("\b\b\b\b" + 4) - num);
 277                          * return;
 278                          */
 279                         do {
 280                                 bb_putchar('\b');
 281                         } while (--num);
 282                         return;
 283                 }
 284                 printf("\033[%uD", num);
 285                 return;
 286         }
 287
 288         /* Need to go one or more lines up */
 289         num -= cmdedit_x;
 290         {
 291                 unsigned w = cmdedit_termw; /* volatile var */
 292                 count_y = 1 + (num / w);
 293                 cmdedit_y -= count_y;
 294                 cmdedit_x = w * count_y - num;
 295         }
 296         /* go to 1st column; go up; go to correct column */
 297         printf("\r" "\033[%dA" "\033[%dC", count_y, cmdedit_x);
 298 }
 299
 300 static void put_prompt(void)
 301 {
 302         out1str(cmdedit_prompt);
 303         cursor = 0;
 304         {
 305                 unsigned w = cmdedit_termw; /* volatile var */
 306                 cmdedit_y = cmdedit_prmt_len / w; /* new quasireal y */
 307                 cmdedit_x = cmdedit_prmt_len % w;
 308         }
 309 }
 310
 311 /* draw prompt, editor line, and clear tail */
 312 static void redraw(int y, int back_cursor)
 313 {
 314         if (y > 0)                              /* up to start y */
 315                 printf("\033[%dA", y);
 316         bb_putchar('\r');
 317         put_prompt();
 318         input_end();                            /* rewrite */
 319         printf("\033[J");                       /* erase after cursor */
 320         input_backward(back_cursor);
 321 }
 322
 323 /* Delete the char in front of the cursor, optionally saving it
 324  * for later putback */
 325 #if !ENABLE_FEATURE_EDITING_VI
 326 static void input_delete(void)
 327 #define input_delete(save) input_delete()
 328 #else
 329 static void input_delete(int save)
 330 #endif
 331 {
 332         int j = cursor;
 333
 334         if (j == (int)command_len)
 335                 return;
 336
 337 #if ENABLE_FEATURE_EDITING_VI
 338         if (save) {
 339                 if (newdelflag) {
 340                         delptr = delbuf;
 341                         newdelflag = 0;
 342                 }
 343                 if ((delptr - delbuf) < DELBUFSIZ)
 344                         *delptr++ = command_ps[j];
 345         }
 346 #endif
 347
 348         overlapping_strcpy(command_ps + j, command_ps + j + 1);
 349         command_len--;
 350         input_end();                    /* rewrite new line */
 351         cmdedit_set_out_char(' ');      /* erase char */
 352         input_backward(cursor - j);     /* back to old pos cursor */
 353 }
 354
 355 #if ENABLE_FEATURE_EDITING_VI
 356 static void put(void)
 357 {
 358         int ocursor;
 359         int j = delptr - delbuf;
 360
 361         if (j == 0)
 362                 return;
 363         ocursor = cursor;
 364         /* open hole and then fill it */
 365         memmove(command_ps + cursor + j, command_ps + cursor, command_len - cursor + 1);
 366         strncpy(command_ps + cursor, delbuf, j);
 367         command_len += j;
 368         input_end();                    /* rewrite new line */
 369         input_backward(cursor - ocursor - j + 1); /* at end of new text */
 370 }
 371 #endif
 372
 373 /* Delete the char in back of the cursor */
 374 static void input_backspace(void)
 375 {
 376         if (cursor > 0) {
 377                 input_backward(1);
 378                 input_delete(0);
 379         }
 380 }
 381
 382 /* Move forward one character */
 383 static void input_forward(void)
 384 {
 385         if (cursor < command_len)
 386                 cmdedit_set_out_char(command_ps[cursor + 1]);
 387 }
 388
 389 #if ENABLE_FEATURE_TAB_COMPLETION
 390
 391 static void free_tab_completion_data(void)
 392 {
 393         if (matches) {
 394                 while (num_matches)
 395                         free(matches[--num_matches]);
 396                 free(matches);
 397                 matches = NULL;
 398         }
 399 }
 400
 401 static void add_match(char *matched)
 402 {
 403         matches = xrealloc_vector(matches, 4, num_matches);
 404         matches[num_matches] = matched;
 405         num_matches++;
 406 }
 407
 408 #if ENABLE_FEATURE_USERNAME_COMPLETION
 409 static void username_tab_completion(char *ud, char *with_shash_flg)
 410 {
 411         struct passwd *entry;
 412         int userlen;
 413
 414         ud++;                           /* ~user/... to user/... */
 415         userlen = strlen(ud);
 416
 417         if (with_shash_flg) {           /* "~/..." or "~user/..." */
 418                 char *sav_ud = ud - 1;
 419                 char *home = NULL;
 420
 421                 if (*ud == '/') {       /* "~/..."     */
 422                         home = home_pwd_buf;
 423                 } else {
 424                         /* "~user/..." */
 425                         char *temp;
 426                         temp = strchr(ud, '/');
 427                         *temp = '\0';           /* ~user\0 */
 428                         entry = getpwnam(ud);
 429                         *temp = '/';            /* restore ~user/... */
 430                         ud = temp;
 431                         if (entry)
 432                                 home = entry->pw_dir;
 433                 }
 434                 if (home) {
 435                         if ((userlen + strlen(home) + 1) < MAX_LINELEN) {
 436                                 /* /home/user/... */
 437                                 sprintf(sav_ud, "%s%s", home, ud);
 438                         }
 439                 }
 440         } else {
 441                 /* "~[^/]*" */
 442                 /* Using _r function to avoid pulling in static buffers */
 443                 char line_buff[256];
 444                 struct passwd pwd;
 445                 struct passwd *result;
 446
 447                 setpwent();
 448                 while (!getpwent_r(&pwd, line_buff, sizeof(line_buff), &result)) {
 449                         /* Null usernames should result in all users as possible completions. */
 450                         if (/*!userlen || */ strncmp(ud, pwd.pw_name, userlen) == 0) {
 451                                 add_match(xasprintf("~%s/", pwd.pw_name));
 452                         }
 453                 }
 454                 endpwent();
 455         }
 456 }
 457 #endif  /* FEATURE_COMMAND_USERNAME_COMPLETION */
 458
 459 enum {
 460         FIND_EXE_ONLY = 0,
 461         FIND_DIR_ONLY = 1,
 462         FIND_FILE_ONLY = 2,
 463 };
 464
 465 static int path_parse(char ***p, int flags)
 466 {
 467         int npth;
 468         const char *pth;
 469         char *tmp;
 470         char **res;
 471
 472         /* if not setenv PATH variable, to search cur dir "." */
 473         if (flags != FIND_EXE_ONLY)
 474                 return 1;
 475
 476         if (state->flags & WITH_PATH_LOOKUP)
 477                 pth = state->path_lookup;
 478         else
 479                 pth = getenv("PATH");
 480         /* PATH=<empty> or PATH=:<empty> */
 481         if (!pth || !pth[0] || LONE_CHAR(pth, ':'))
 482                 return 1;
 483
 484         tmp = (char*)pth;
 485         npth = 1; /* path component count */
 486         while (1) {
 487                 tmp = strchr(tmp, ':');
 488                 if (!tmp)
 489                         break;
 490                 if (*++tmp == '\0')
 491                         break;  /* :<empty> */
 492                 npth++;
 493         }
 494
 495         res = xmalloc(npth * sizeof(char*));
 496         res[0] = tmp = xstrdup(pth);
 497         npth = 1;
 498         while (1) {
 499                 tmp = strchr(tmp, ':');
 500                 if (!tmp)
 501                         break;
 502                 *tmp++ = '\0'; /* ':' -> '\0' */
 503                 if (*tmp == '\0')
 504                         break; /* :<empty> */
 505                 res[npth++] = tmp;
 506         }
 507         *p = res;
 508         return npth;
 509 }
 510
 511 static void exe_n_cwd_tab_completion(char *command, int type)
 512 {
 513         DIR *dir;
 514         struct dirent *next;
 515         struct stat st;
 516         char *path1[1];
 517         char **paths = path1;
 518         int npaths;
 519         int i;
 520         char *found;
 521         char *pfind = strrchr(command, '/');
 522 /*      char dirbuf[MAX_LINELEN]; */
 523 #define dirbuf (S.exe_n_cwd_tab_completion__dirbuf)
 524
 525         npaths = 1;
 526         path1[0] = (char*)".";
 527
 528         if (pfind == NULL) {
 529                 /* no dir, if flags==EXE_ONLY - get paths, else "." */
 530                 npaths = path_parse(&paths, type);
 531                 pfind = command;
 532         } else {
 533                 /* dirbuf = ".../.../.../" */
 534                 safe_strncpy(dirbuf, command, (pfind - command) + 2);
 535 #if ENABLE_FEATURE_USERNAME_COMPLETION
 536                 if (dirbuf[0] == '~')   /* ~/... or ~user/... */
 537                         username_tab_completion(dirbuf, dirbuf);
 538 #endif
 539                 paths[0] = dirbuf;
 540                 /* point to 'l' in "..../last_component" */
 541                 pfind++;
 542         }
 543
 544         for (i = 0; i < npaths; i++) {
 545                 dir = opendir(paths[i]);
 546                 if (!dir)
 547                         continue; /* don't print an error */
 548
 549                 while ((next = readdir(dir)) != NULL) {
 550                         int len1;
 551                         const char *str_found = next->d_name;
 552
 553                         /* matched? */
 554                         if (strncmp(str_found, pfind, strlen(pfind)))
 555                                 continue;
 556                         /* not see .name without .match */
 557                         if (*str_found == '.' && *pfind == '\0') {
 558                                 if (NOT_LONE_CHAR(paths[i], '/') || str_found[1])
 559                                         continue;
 560                                 str_found = ""; /* only "/" */
 561                         }
 562                         found = concat_path_file(paths[i], str_found);
 563                         /* hmm, remove in progress? */
 564                         /* NB: stat() first so that we see is it a directory;
 565                          * but if that fails, use lstat() so that
 566                          * we still match dangling links */
 567                         if (stat(found, &st) && lstat(found, &st))
 568                                 goto cont;
 569                         /* find with dirs? */
 570                         if (paths[i] != dirbuf)
 571                                 strcpy(found, next->d_name); /* only name */
 572
 573                         len1 = strlen(found);
 574                         found = xrealloc(found, len1 + 2);
 575                         found[len1] = '\0';
 576                         found[len1+1] = '\0';
 577
 578                         if (S_ISDIR(st.st_mode)) {
 579                                 /* name is a directory */
 580                                 if (found[len1-1] != '/') {
 581                                         found[len1] = '/';
 582                                 }
 583                         } else {
 584                                 /* not put found file if search only dirs for cd */
 585                                 if (type == FIND_DIR_ONLY)
 586                                         goto cont;
 587                         }
 588                         /* Add it to the list */
 589                         add_match(found);
 590                         continue;
 591  cont:
 592                         free(found);
 593                 }
 594                 closedir(dir);
 595         }
 596         if (paths != path1) {
 597                 free(paths[0]); /* allocated memory is only in first member */
 598                 free(paths);
 599         }
 600 #undef dirbuf
 601 }
 602
 603 #define QUOT (UCHAR_MAX+1)
 604
 605 #define collapse_pos(is, in) do { \
 606         memmove(int_buf+(is), int_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
 607         memmove(pos_buf+(is), pos_buf+(in), (MAX_LINELEN+1-(is)-(in)) * sizeof(pos_buf[0])); \
 608 } while (0)
 609
 610 static int find_match(char *matchBuf, int *len_with_quotes)
 611 {
 612         int i, j;
 613         int command_mode;
 614         int c, c2;
 615 /*      int16_t int_buf[MAX_LINELEN + 1]; */
 616 /*      int16_t pos_buf[MAX_LINELEN + 1]; */
 617 #define int_buf (S.find_match__int_buf)
 618 #define pos_buf (S.find_match__pos_buf)
 619
 620         /* set to integer dimension characters and own positions */
 621         for (i = 0;; i++) {
 622                 int_buf[i] = (unsigned char)matchBuf[i];
 623                 if (int_buf[i] == 0) {
 624                         pos_buf[i] = -1;        /* indicator end line */
 625                         break;
 626                 }
 627                 pos_buf[i] = i;
 628         }
 629
 630         /* mask \+symbol and convert '\t' to ' ' */
 631         for (i = j = 0; matchBuf[i]; i++, j++)
 632                 if (matchBuf[i] == '\\') {
 633                         collapse_pos(j, j + 1);
 634                         int_buf[j] |= QUOT;
 635                         i++;
 636 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 637                         if (matchBuf[i] == '\t')        /* algorithm equivalent */
 638                                 int_buf[j] = ' ' | QUOT;
 639 #endif
 640                 }
 641 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
 642                 else if (matchBuf[i] == '\t')
 643                         int_buf[j] = ' ';
 644 #endif
 645
 646         /* mask "symbols" or 'symbols' */
 647         c2 = 0;
 648         for (i = 0; int_buf[i]; i++) {
 649                 c = int_buf[i];
 650                 if (c == '\'' || c == '"') {
 651                         if (c2 == 0)
 652                                 c2 = c;
 653                         else {
 654                                 if (c == c2)
 655                                         c2 = 0;
 656                                 else
 657                                         int_buf[i] |= QUOT;
 658                         }
 659                 } else if (c2 != 0 && c != '$')
 660                         int_buf[i] |= QUOT;
 661         }
 662
 663         /* skip commands with arguments if line has commands delimiters */
 664         /* ';' ';;' '&' '|' '&&' '||' but `>&' `<&' `>|' */
 665         for (i = 0; int_buf[i]; i++) {
 666                 c = int_buf[i];
 667                 c2 = int_buf[i + 1];
 668                 j = i ? int_buf[i - 1] : -1;
 669                 command_mode = 0;
 670                 if (c == ';' || c == '&' || c == '|') {
 671                         command_mode = 1 + (c == c2);
 672                         if (c == '&') {
 673                                 if (j == '>' || j == '<')
 674                                         command_mode = 0;
 675                         } else if (c == '|' && j == '>')
 676                                 command_mode = 0;
 677                 }
 678                 if (command_mode) {
 679                         collapse_pos(0, i + command_mode);
 680                         i = -1;                         /* hack incremet */
 681                 }
 682         }
 683         /* collapse `command...` */
 684         for (i = 0; int_buf[i]; i++)
 685                 if (int_buf[i] == '`') {
 686                         for (j = i + 1; int_buf[j]; j++)
 687                                 if (int_buf[j] == '`') {
 688                                         collapse_pos(i, j + 1);
 689                                         j = 0;
 690                                         break;
 691                                 }
 692                         if (j) {
 693                                 /* not found close ` - command mode, collapse all previous */
 694                                 collapse_pos(0, i + 1);
 695                                 break;
 696                         } else
 697                                 i--;                    /* hack incremet */
 698                 }
 699
 700         /* collapse (command...(command...)...) or {command...{command...}...} */
 701         c = 0;                                          /* "recursive" level */
 702         c2 = 0;
 703         for (i = 0; int_buf[i]; i++)
 704                 if (int_buf[i] == '(' || int_buf[i] == '{') {
 705                         if (int_buf[i] == '(')
 706                                 c++;
 707                         else
 708                                 c2++;
 709                         collapse_pos(0, i + 1);
 710                         i = -1;                         /* hack incremet */
 711                 }
 712         for (i = 0; pos_buf[i] >= 0 && (c > 0 || c2 > 0); i++)
 713                 if ((int_buf[i] == ')' && c > 0) || (int_buf[i] == '}' && c2 > 0)) {
 714                         if (int_buf[i] == ')')
 715                                 c--;
 716                         else
 717                                 c2--;
 718                         collapse_pos(0, i + 1);
 719                         i = -1;                         /* hack incremet */
 720                 }
 721
 722         /* skip first not quote space */
 723         for (i = 0; int_buf[i]; i++)
 724                 if (int_buf[i] != ' ')
 725                         break;
 726         if (i)
 727                 collapse_pos(0, i);
 728
 729         /* set find mode for completion */
 730         command_mode = FIND_EXE_ONLY;
 731         for (i = 0; int_buf[i]; i++)
 732                 if (int_buf[i] == ' ' || int_buf[i] == '<' || int_buf[i] == '>') {
 733                         if (int_buf[i] == ' ' && command_mode == FIND_EXE_ONLY
 734                          && matchBuf[pos_buf[0]] == 'c'
 735                          && matchBuf[pos_buf[1]] == 'd'
 736                         ) {
 737                                 command_mode = FIND_DIR_ONLY;
 738                         } else {
 739                                 command_mode = FIND_FILE_ONLY;
 740                                 break;
 741                         }
 742                 }
 743         for (i = 0; int_buf[i]; i++)
 744                 /* "strlen" */;
 745         /* find last word */
 746         for (--i; i >= 0; i--) {
 747                 c = int_buf[i];
 748                 if (c == ' ' || c == '<' || c == '>' || c == '|' || c == '&') {
 749                         collapse_pos(0, i + 1);
 750                         break;
 751                 }
 752         }
 753         /* skip first not quoted '\'' or '"' */
 754         for (i = 0; int_buf[i] == '\'' || int_buf[i] == '"'; i++)
 755                 /*skip*/;
 756         /* collapse quote or unquote // or /~ */
 757         while ((int_buf[i] & ~QUOT) == '/'
 758          && ((int_buf[i+1] & ~QUOT) == '/' || (int_buf[i+1] & ~QUOT) == '~')
 759         ) {
 760                 i++;
 761         }
 762
 763         /* set only match and destroy quotes */
 764         j = 0;
 765         for (c = 0; pos_buf[i] >= 0; i++) {
 766                 matchBuf[c++] = matchBuf[pos_buf[i]];
 767                 j = pos_buf[i] + 1;
 768         }
 769         matchBuf[c] = '\0';
 770         /* old length matchBuf with quotes symbols */
 771         *len_with_quotes = j ? j - pos_buf[0] : 0;
 772
 773         return command_mode;
 774 #undef int_buf
 775 #undef pos_buf
 776 }
 777
 778 /*
 779  * display by column (original idea from ls applet,
 780  * very optimized by me :)
 781  */
 782 static void showfiles(void)
 783 {
 784         int ncols, row;
 785         int column_width = 0;
 786         int nfiles = num_matches;
 787         int nrows = nfiles;
 788         int l;
 789
 790         /* find the longest file name-  use that as the column width */
 791         for (row = 0; row < nrows; row++) {
 792                 l = strlen(matches[row]);
 793                 if (column_width < l)
 794                         column_width = l;
 795         }
 796         column_width += 2;              /* min space for columns */
 797         ncols = cmdedit_termw / column_width;
 798
 799         if (ncols > 1) {
 800                 nrows /= ncols;
 801                 if (nfiles % ncols)
 802                         nrows++;        /* round up fractionals */
 803         } else {
 804                 ncols = 1;
 805         }
 806         for (row = 0; row < nrows; row++) {
 807                 int n = row;
 808                 int nc;
 809
 810                 for (nc = 1; nc < ncols && n+nrows < nfiles; n += nrows, nc++) {
 811                         printf("%s%-*s", matches[n],
 812                                 (int)(column_width - strlen(matches[n])), "");
 813                 }
 814                 puts(matches[n]);
 815         }
 816 }
 817
 818 static char *add_quote_for_spec_chars(char *found)
 819 {
 820         int l = 0;
 821         char *s = xmalloc((strlen(found) + 1) * 2);
 822
 823         while (*found) {
 824                 if (strchr(" `\"#$%^&*()=+{}[]:;\'|\\<>", *found))
 825                         s[l++] = '\\';
 826                 s[l++] = *found++;
 827         }
 828         s[l] = 0;
 829         return s;
 830 }
 831
 832 /* Do TAB completion */
 833 static void input_tab(smallint *lastWasTab)
 834 {
 835         if (!(state->flags & TAB_COMPLETION))
 836                 return;
 837
 838         if (!*lastWasTab) {
 839                 char *tmp, *tmp1;
 840                 size_t len_found;
 841 /*              char matchBuf[MAX_LINELEN]; */
 842 #define matchBuf (S.input_tab__matchBuf)
 843                 int find_type;
 844                 int recalc_pos;
 845
 846                 *lastWasTab = TRUE;             /* flop trigger */
 847
 848                 /* Make a local copy of the string -- up
 849                  * to the position of the cursor */
 850                 tmp = strncpy(matchBuf, command_ps, cursor);
 851                 tmp[cursor] = '\0';
 852
 853                 find_type = find_match(matchBuf, &recalc_pos);
 854
 855                 /* Free up any memory already allocated */
 856                 free_tab_completion_data();
 857
 858 #if ENABLE_FEATURE_USERNAME_COMPLETION
 859                 /* If the word starts with `~' and there is no slash in the word,
 860                  * then try completing this word as a username. */
 861                 if (state->flags & USERNAME_COMPLETION)
 862                         if (matchBuf[0] == '~' && strchr(matchBuf, '/') == 0)
 863                                 username_tab_completion(matchBuf, NULL);
 864 #endif
 865                 /* Try to match any executable in our path and everything
 866                  * in the current working directory */
 867                 if (!matches)
 868                         exe_n_cwd_tab_completion(matchBuf, find_type);
 869                 /* Sort, then remove any duplicates found */
 870                 if (matches) {
 871                         unsigned i;
 872                         int n = 0;
 873                         qsort_string_vector(matches, num_matches);
 874                         for (i = 0; i < num_matches - 1; ++i) {
 875                                 if (matches[i] && matches[i+1]) { /* paranoia */
 876                                         if (strcmp(matches[i], matches[i+1]) == 0) {
 877                                                 free(matches[i]);
 878                                                 matches[i] = NULL; /* paranoia */
 879                                         } else {
 880                                                 matches[n++] = matches[i];
 881                                         }
 882                                 }
 883                         }
 884                         matches[n] = matches[i];
 885                         num_matches = n + 1;
 886                 }
 887                 /* Did we find exactly one match? */
 888                 if (!matches || num_matches > 1) {
 889                         beep();
 890                         if (!matches)
 891                                 return;         /* not found */
 892                         /* find minimal match */
 893                         tmp1 = xstrdup(matches[0]);
 894                         for (tmp = tmp1; *tmp; tmp++)
 895                                 for (len_found = 1; len_found < num_matches; len_found++)
 896                                         if (matches[len_found][(tmp - tmp1)] != *tmp) {
 897                                                 *tmp = '\0';
 898                                                 break;
 899                                         }
 900                         if (*tmp1 == '\0') {        /* have unique */
 901                                 free(tmp1);
 902                                 return;
 903                         }
 904                         tmp = add_quote_for_spec_chars(tmp1);
 905                         free(tmp1);
 906                 } else {                        /* one match */
 907                         tmp = add_quote_for_spec_chars(matches[0]);
 908                         /* for next completion current found */
 909                         *lastWasTab = FALSE;
 910
 911                         len_found = strlen(tmp);
 912                         if (tmp[len_found-1] != '/') {
 913                                 tmp[len_found] = ' ';
 914                                 tmp[len_found+1] = '\0';
 915                         }
 916                 }
 917                 len_found = strlen(tmp);
 918                 /* have space to placed match? */
 919                 if ((len_found - strlen(matchBuf) + command_len) < MAX_LINELEN) {
 920                         /* before word for match   */
 921                         command_ps[cursor - recalc_pos] = '\0';
 922                         /* save   tail line        */
 923                         strcpy(matchBuf, command_ps + cursor);
 924                         /* add    match            */
 925                         strcat(command_ps, tmp);
 926                         /* add    tail             */
 927                         strcat(command_ps, matchBuf);
 928                         /* back to begin word for match    */
 929                         input_backward(recalc_pos);
 930                         /* new pos                         */
 931                         recalc_pos = cursor + len_found;
 932                         /* new len                         */
 933                         command_len = strlen(command_ps);
 934                         /* write out the matched command   */
 935                         redraw(cmdedit_y, command_len - recalc_pos);
 936                 }
 937                 free(tmp);
 938 #undef matchBuf
 939         } else {
 940                 /* Ok -- the last char was a TAB.  Since they
 941                  * just hit TAB again, print a list of all the
 942                  * available choices... */
 943                 if (matches && num_matches > 0) {
 944                         int sav_cursor = cursor;        /* change goto_new_line() */
 945
 946                         /* Go to the next line */
 947                         goto_new_line();
 948                         showfiles();
 949                         redraw(0, command_len - sav_cursor);
 950                 }
 951         }
 952 }
 953
 954 #endif  /* FEATURE_COMMAND_TAB_COMPLETION */
 955
 956
 957 #if MAX_HISTORY > 0
 958
 959 static void save_command_ps_at_cur_history(void)
 960 {
 961         if (command_ps[0] != '\0') {
 962                 int cur = state->cur_history;
 963                 free(state->history[cur]);
 964                 state->history[cur] = xstrdup(command_ps);
 965         }
 966 }
 967
 968 /* state->flags is already checked to be nonzero */
 969 static int get_previous_history(void)
 970 {
 971         if ((state->flags & DO_HISTORY) && state->cur_history) {
 972                 save_command_ps_at_cur_history();
 973                 state->cur_history--;
 974                 return 1;
 975         }
 976         beep();
 977         return 0;
 978 }
 979
 980 static int get_next_history(void)
 981 {
 982         if (state->flags & DO_HISTORY) {
 983                 if (state->cur_history < state->cnt_history) {
 984                         save_command_ps_at_cur_history(); /* save the current history line */
 985                         return ++state->cur_history;
 986                 }
 987         }
 988         beep();
 989         return 0;
 990 }
 991
 992 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
 993 /* state->flags is already checked to be nonzero */
 994 static void load_history(const char *fromfile)
 995 {
 996         FILE *fp;
 997         int hi;
 998
 999         /* NB: do not trash old history if file can't be opened */
1000
1001         fp = fopen_for_read(fromfile);
1002         if (fp) {
1003                 /* clean up old history */
1004                 for (hi = state->cnt_history; hi > 0;) {
1005                         hi--;
1006                         free(state->history[hi]);
1007                         state->history[hi] = NULL;
1008                 }
1009
1010                 for (hi = 0; hi < MAX_HISTORY;) {
1011                         char *hl = xmalloc_fgetline(fp);
1012                         int l;
1013
1014                         if (!hl)
1015                                 break;
1016                         l = strlen(hl);
1017                         if (l >= MAX_LINELEN)
1018                                 hl[MAX_LINELEN-1] = '\0';
1019                         if (l == 0) {
1020                                 free(hl);
1021                                 continue;
1022                         }
1023                         state->history[hi++] = hl;
1024                 }
1025                 fclose(fp);
1026                 state->cnt_history = hi;
1027         }
1028 }
1029
1030 /* state->flags is already checked to be nonzero */
1031 static void save_history(const char *tofile)
1032 {
1033         FILE *fp;
1034
1035         fp = fopen_for_write(tofile);
1036         if (fp) {
1037                 int i;
1038
1039                 for (i = 0; i < state->cnt_history; i++) {
1040                         fprintf(fp, "%s\n", state->history[i]);
1041                 }
1042                 fclose(fp);
1043         }
1044 }
1045 #else
1046 #define load_history(a) ((void)0)
1047 #define save_history(a) ((void)0)
1048 #endif /* FEATURE_COMMAND_SAVEHISTORY */
1049
1050 static void remember_in_history(const char *str)
1051 {
1052         int i;
1053
1054         if (!(state->flags & DO_HISTORY))
1055                 return;
1056         if (str[0] == '\0')
1057                 return;
1058         i = state->cnt_history;
1059         /* Don't save dupes */
1060         if (i && strcmp(state->history[i-1], str) == 0)
1061                 return;
1062
1063         free(state->history[MAX_HISTORY]); /* redundant, paranoia */
1064         state->history[MAX_HISTORY] = NULL; /* redundant, paranoia */
1065
1066         /* If history[] is full, remove the oldest command */
1067         /* we need to keep history[MAX_HISTORY] empty, hence >=, not > */
1068         if (i >= MAX_HISTORY) {
1069                 free(state->history[0]);
1070                 for (i = 0; i < MAX_HISTORY-1; i++)
1071                         state->history[i] = state->history[i+1];
1072                 /* i == MAX_HISTORY-1 */
1073         }
1074         /* i <= MAX_HISTORY-1 */
1075         state->history[i++] = xstrdup(str);
1076         /* i <= MAX_HISTORY */
1077         state->cur_history = i;
1078         state->cnt_history = i;
1079 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1080         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1081                 save_history(state->hist_file);
1082 #endif
1083         USE_FEATURE_EDITING_FANCY_PROMPT(num_ok_lines++;)
1084 }
1085
1086 #else /* MAX_HISTORY == 0 */
1087 #define remember_in_history(a) ((void)0)
1088 #endif /* MAX_HISTORY */
1089
1090
1091 /*
1092  * This function is used to grab a character buffer
1093  * from the input file descriptor and allows you to
1094  * a string with full command editing (sort of like
1095  * a mini readline).
1096  *
1097  * The following standard commands are not implemented:
1098  * ESC-b -- Move back one word
1099  * ESC-f -- Move forward one word
1100  * ESC-d -- Delete back one word
1101  * ESC-h -- Delete forward one word
1102  * CTL-t -- Transpose two characters
1103  *
1104  * Minimalist vi-style command line editing available if configured.
1105  * vi mode implemented 2005 by Paul Fox <pgf@foxharp.boston.ma.us>
1106  */
1107
1108 #if ENABLE_FEATURE_EDITING_VI
1109 static void
1110 vi_Word_motion(char *command, int eat)
1111 {
1112         while (cursor < command_len && !isspace(command[cursor]))
1113                 input_forward();
1114         if (eat) while (cursor < command_len && isspace(command[cursor]))
1115                 input_forward();
1116 }
1117
1118 static void
1119 vi_word_motion(char *command, int eat)
1120 {
1121         if (isalnum(command[cursor]) || command[cursor] == '_') {
1122                 while (cursor < command_len
1123                  && (isalnum(command[cursor+1]) || command[cursor+1] == '_'))
1124                         input_forward();
1125         } else if (ispunct(command[cursor])) {
1126                 while (cursor < command_len && ispunct(command[cursor+1]))
1127                         input_forward();
1128         }
1129
1130         if (cursor < command_len)
1131                 input_forward();
1132
1133         if (eat && cursor < command_len && isspace(command[cursor]))
1134                 while (cursor < command_len && isspace(command[cursor]))
1135                         input_forward();
1136 }
1137
1138 static void
1139 vi_End_motion(char *command)
1140 {
1141         input_forward();
1142         while (cursor < command_len && isspace(command[cursor]))
1143                 input_forward();
1144         while (cursor < command_len-1 && !isspace(command[cursor+1]))
1145                 input_forward();
1146 }
1147
1148 static void
1149 vi_end_motion(char *command)
1150 {
1151         if (cursor >= command_len-1)
1152                 return;
1153         input_forward();
1154         while (cursor < command_len-1 && isspace(command[cursor]))
1155                 input_forward();
1156         if (cursor >= command_len-1)
1157                 return;
1158         if (isalnum(command[cursor]) || command[cursor] == '_') {
1159                 while (cursor < command_len-1
1160                  && (isalnum(command[cursor+1]) || command[cursor+1] == '_')
1161                 ) {
1162                         input_forward();
1163                 }
1164         } else if (ispunct(command[cursor])) {
1165                 while (cursor < command_len-1 && ispunct(command[cursor+1]))
1166                         input_forward();
1167         }
1168 }
1169
1170 static void
1171 vi_Back_motion(char *command)
1172 {
1173         while (cursor > 0 && isspace(command[cursor-1]))
1174                 input_backward(1);
1175         while (cursor > 0 && !isspace(command[cursor-1]))
1176                 input_backward(1);
1177 }
1178
1179 static void
1180 vi_back_motion(char *command)
1181 {
1182         if (cursor <= 0)
1183                 return;
1184         input_backward(1);
1185         while (cursor > 0 && isspace(command[cursor]))
1186                 input_backward(1);
1187         if (cursor <= 0)
1188                 return;
1189         if (isalnum(command[cursor]) || command[cursor] == '_') {
1190                 while (cursor > 0
1191                  && (isalnum(command[cursor-1]) || command[cursor-1] == '_')
1192                 ) {
1193                         input_backward(1);
1194                 }
1195         } else if (ispunct(command[cursor])) {
1196                 while (cursor > 0 && ispunct(command[cursor-1]))
1197                         input_backward(1);
1198         }
1199 }
1200 #endif
1201
1202
1203 /*
1204  * read_line_input and its helpers
1205  */
1206
1207 #if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
1208 static void parse_and_put_prompt(const char *prmt_ptr)
1209 {
1210         cmdedit_prompt = prmt_ptr;
1211         cmdedit_prmt_len = strlen(prmt_ptr);
1212         put_prompt();
1213 }
1214 #else
1215 static void parse_and_put_prompt(const char *prmt_ptr)
1216 {
1217         int prmt_len = 0;
1218         size_t cur_prmt_len = 0;
1219         char flg_not_length = '[';
1220         char *prmt_mem_ptr = xzalloc(1);
1221         char *cwd_buf = xrealloc_getcwd_or_warn(NULL);
1222         char cbuf[2];
1223         char c;
1224         char *pbuf;
1225
1226         cmdedit_prmt_len = 0;
1227
1228         if (!cwd_buf) {
1229                 cwd_buf = (char *)bb_msg_unknown;
1230         }
1231
1232         cbuf[1] = '\0'; /* never changes */
1233
1234         while (*prmt_ptr) {
1235                 char *free_me = NULL;
1236
1237                 pbuf = cbuf;
1238                 c = *prmt_ptr++;
1239                 if (c == '\\') {
1240                         const char *cp = prmt_ptr;
1241                         int l;
1242
1243                         c = bb_process_escape_sequence(&prmt_ptr);
1244                         if (prmt_ptr == cp) {
1245                                 if (*cp == '\0')
1246                                         break;
1247                                 c = *prmt_ptr++;
1248
1249                                 switch (c) {
1250 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1251                                 case 'u':
1252                                         pbuf = user_buf ? user_buf : (char*)"";
1253                                         break;
1254 #endif
1255                                 case 'h':
1256                                         pbuf = free_me = safe_gethostname();
1257                                         *strchrnul(pbuf, '.') = '\0';
1258                                         break;
1259                                 case '$':
1260                                         c = (geteuid() == 0 ? '#' : '$');
1261                                         break;
1262 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1263                                 case 'w':
1264                                         /* /home/user[/something] -> ~[/something] */
1265                                         pbuf = cwd_buf;
1266                                         l = strlen(home_pwd_buf);
1267                                         if (l != 0
1268                                          && strncmp(home_pwd_buf, cwd_buf, l) == 0
1269                                          && (cwd_buf[l]=='/' || cwd_buf[l]=='\0')
1270                                          && strlen(cwd_buf + l) < PATH_MAX
1271                                         ) {
1272                                                 pbuf = free_me = xasprintf("~%s", cwd_buf + l);
1273                                         }
1274                                         break;
1275 #endif
1276                                 case 'W':
1277                                         pbuf = cwd_buf;
1278                                         cp = strrchr(pbuf, '/');
1279                                         if (cp != NULL && cp != pbuf)
1280                                                 pbuf += (cp-pbuf) + 1;
1281                                         break;
1282                                 case '!':
1283                                         pbuf = free_me = xasprintf("%d", num_ok_lines);
1284                                         break;
1285                                 case 'e': case 'E':     /* \e \E = \033 */
1286                                         c = '\033';
1287                                         break;
1288                                 case 'x': case 'X': {
1289                                         char buf2[4];
1290                                         for (l = 0; l < 3;) {
1291                                                 unsigned h;
1292                                                 buf2[l++] = *prmt_ptr;
1293                                                 buf2[l] = '\0';
1294                                                 h = strtoul(buf2, &pbuf, 16);
1295                                                 if (h > UCHAR_MAX || (pbuf - buf2) < l) {
1296                                                         buf2[--l] = '\0';
1297                                                         break;
1298                                                 }
1299                                                 prmt_ptr++;
1300                                         }
1301                                         c = (char)strtoul(buf2, NULL, 16);
1302                                         if (c == 0)
1303                                                 c = '?';
1304                                         pbuf = cbuf;
1305                                         break;
1306                                 }
1307                                 case '[': case ']':
1308                                         if (c == flg_not_length) {
1309                                                 flg_not_length = (flg_not_length == '[' ? ']' : '[');
1310                                                 continue;
1311                                         }
1312                                         break;
1313                                 } /* switch */
1314                         } /* if */
1315                 } /* if */
1316                 cbuf[0] = c;
1317                 cur_prmt_len = strlen(pbuf);
1318                 prmt_len += cur_prmt_len;
1319                 if (flg_not_length != ']')
1320                         cmdedit_prmt_len += cur_prmt_len;
1321                 prmt_mem_ptr = strcat(xrealloc(prmt_mem_ptr, prmt_len+1), pbuf);
1322                 free(free_me);
1323         } /* while */
1324
1325         if (cwd_buf != (char *)bb_msg_unknown)
1326                 free(cwd_buf);
1327         cmdedit_prompt = prmt_mem_ptr;
1328         put_prompt();
1329 }
1330 #endif
1331
1332 static void cmdedit_setwidth(unsigned w, int redraw_flg)
1333 {
1334         cmdedit_termw = w;
1335         if (redraw_flg) {
1336                 /* new y for current cursor */
1337                 int new_y = (cursor + cmdedit_prmt_len) / w;
1338                 /* redraw */
1339                 redraw((new_y >= cmdedit_y ? new_y : cmdedit_y), command_len - cursor);
1340                 fflush(stdout);
1341         }
1342 }
1343
1344 static void win_changed(int nsig)
1345 {
1346         unsigned width;
1347         get_terminal_width_height(0, &width, NULL);
1348         cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
1349         if (nsig == SIGWINCH)
1350                 signal(SIGWINCH, win_changed); /* rearm ourself */
1351 }
1352
1353 /*
1354  * The emacs and vi modes share much of the code in the big
1355  * command loop.  Commands entered when in vi's command mode (aka
1356  * "escape mode") get an extra bit added to distinguish them --
1357  * this keeps them from being self-inserted.  This clutters the
1358  * big switch a bit, but keeps all the code in one place.
1359  */
1360
1361 #define vbit 0x100
1362
1363 /* leave out the "vi-mode"-only case labels if vi editing isn't
1364  * configured. */
1365 #define vi_case(caselabel) USE_FEATURE_EDITING(case caselabel)
1366
1367 /* convert uppercase ascii to equivalent control char, for readability */
1368 #undef CTRL
1369 #define CTRL(a) ((a) & ~0x40)
1370
1371 /* Returns:
1372  * -1 on read errors or EOF, or on bare Ctrl-D,
1373  * 0  on ctrl-C (the line entered is still returned in 'command'),
1374  * >0 length of input string, including terminating '\n'
1375  */
1376 int FAST_FUNC read_line_input(const char *prompt, char *command, int maxsize, line_input_t *st)
1377 {
1378         int len;
1379 #if ENABLE_FEATURE_TAB_COMPLETION
1380         smallint lastWasTab = FALSE;
1381 #endif
1382         unsigned ic;
1383         unsigned char c;
1384         smallint break_out = 0;
1385 #if ENABLE_FEATURE_EDITING_VI
1386         smallint vi_cmdmode = 0;
1387         smalluint prevc;
1388 #endif
1389         struct termios initial_settings;
1390         struct termios new_settings;
1391
1392         INIT_S();
1393
1394         if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
1395          || !(initial_settings.c_lflag & ECHO)
1396         ) {
1397                 /* Happens when e.g. stty -echo was run before */
1398                 parse_and_put_prompt(prompt);
1399                 fflush(stdout);
1400                 if (fgets(command, maxsize, stdin) == NULL)
1401                         len = -1; /* EOF or error */
1402                 else
1403                         len = strlen(command);
1404                 DEINIT_S();
1405                 return len;
1406         }
1407
1408 // FIXME: audit & improve this
1409         if (maxsize > MAX_LINELEN)
1410                 maxsize = MAX_LINELEN;
1411
1412         /* With null flags, no other fields are ever used */
1413         state = st ? st : (line_input_t*) &const_int_0;
1414 #if ENABLE_FEATURE_EDITING_SAVEHISTORY
1415         if ((state->flags & SAVE_HISTORY) && state->hist_file)
1416                 load_history(state->hist_file);
1417 #endif
1418         if (state->flags & DO_HISTORY)
1419                 state->cur_history = state->cnt_history;
1420
1421         /* prepare before init handlers */
1422         cmdedit_y = 0;  /* quasireal y, not true if line > xt*yt */
1423         command_len = 0;
1424         command_ps = command;
1425         command[0] = '\0';
1426
1427         new_settings = initial_settings;
1428         new_settings.c_lflag &= ~ICANON;        /* unbuffered input */
1429         /* Turn off echoing and CTRL-C, so we can trap it */
1430         new_settings.c_lflag &= ~(ECHO | ECHONL | ISIG);
1431         /* Hmm, in linux c_cc[] is not parsed if ICANON is off */
1432         new_settings.c_cc[VMIN] = 1;
1433         new_settings.c_cc[VTIME] = 0;
1434         /* Turn off CTRL-C, so we can trap it */
1435 #ifndef _POSIX_VDISABLE
1436 #define _POSIX_VDISABLE '\0'
1437 #endif
1438         new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
1439         tcsetattr_stdin_TCSANOW(&new_settings);
1440
1441         /* Now initialize things */
1442         previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
1443         win_changed(0); /* do initial resizing */
1444 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
1445         {
1446                 struct passwd *entry;
1447
1448                 entry = getpwuid(geteuid());
1449                 if (entry) {
1450                         user_buf = xstrdup(entry->pw_name);
1451                         home_pwd_buf = xstrdup(entry->pw_dir);
1452                 }
1453         }
1454 #endif
1455
1456 #if 0
1457         for (ic = 0; ic <= MAX_HISTORY; ic++)
1458                 bb_error_msg("history[%d]:'%s'", ic, state->history[ic]);
1459         bb_error_msg("cur_history:%d cnt_history:%d", state->cur_history, state->cnt_history);
1460 #endif
1461
1462         /* Print out the command prompt */
1463         parse_and_put_prompt(prompt);
1464
1465         while (1) {
1466                 fflush(NULL);
1467
1468                 if (nonblock_safe_read(STDIN_FILENO, &c, 1) < 1) {
1469                         /* if we can't read input then exit */
1470                         goto prepare_to_die;
1471                 }
1472
1473                 ic = c;
1474
1475 #if ENABLE_FEATURE_EDITING_VI
1476                 newdelflag = 1;
1477                 if (vi_cmdmode)
1478                         ic |= vbit;
1479 #endif
1480                 switch (ic) {
1481                 case '\n':
1482                 case '\r':
1483                 vi_case('\n'|vbit:)
1484                 vi_case('\r'|vbit:)
1485                         /* Enter */
1486                         goto_new_line();
1487                         break_out = 1;
1488                         break;
1489                 case CTRL('A'):
1490                 vi_case('0'|vbit:)
1491                         /* Control-a -- Beginning of line */
1492                         input_backward(cursor);
1493                         break;
1494                 case CTRL('B'):
1495                 vi_case('h'|vbit:)
1496                 vi_case('\b'|vbit:)
1497                 vi_case('\x7f'|vbit:) /* DEL */
1498                         /* Control-b -- Move back one character */
1499                         input_backward(1);
1500                         break;
1501                 case CTRL('C'):
1502                 vi_case(CTRL('C')|vbit:)
1503                         /* Control-c -- stop gathering input */
1504                         goto_new_line();
1505                         command_len = 0;
1506                         break_out = -1; /* "do not append '\n'" */
1507                         break;
1508                 case CTRL('D'):
1509                         /* Control-d -- Delete one character, or exit
1510                          * if the len=0 and no chars to delete */
1511                         if (command_len == 0) {
1512                                 errno = 0;
1513  prepare_to_die:
1514                                 /* to control stopped jobs */
1515                                 break_out = command_len = -1;
1516                                 break;
1517                         }
1518                         input_delete(0);
1519                         break;
1520
1521                 case CTRL('E'):
1522                 vi_case('$'|vbit:)
1523                         /* Control-e -- End of line */
1524                         input_end();
1525                         break;
1526                 case CTRL('F'):
1527                 vi_case('l'|vbit:)
1528                 vi_case(' '|vbit:)
1529                         /* Control-f -- Move forward one character */
1530                         input_forward();
1531                         break;
1532
1533                 case '\b':
1534                 case '\x7f': /* DEL */
1535                         /* Control-h and DEL */
1536                         input_backspace();
1537                         break;
1538
1539 #if ENABLE_FEATURE_TAB_COMPLETION
1540                 case '\t':
1541                         input_tab(&lastWasTab);
1542                         break;
1543 #endif
1544
1545                 case CTRL('K'):
1546                         /* Control-k -- clear to end of line */
1547                         command[cursor] = 0;
1548                         command_len = cursor;
1549                         printf("\033[J");
1550                         break;
1551                 case CTRL('L'):
1552                 vi_case(CTRL('L')|vbit:)
1553                         /* Control-l -- clear screen */
1554                         printf("\033[H");
1555                         redraw(0, command_len - cursor);
1556                         break;
1557
1558 #if MAX_HISTORY > 0
1559                 case CTRL('N'):
1560                 vi_case(CTRL('N')|vbit:)
1561                 vi_case('j'|vbit:)
1562                         /* Control-n -- Get next command in history */
1563                         if (get_next_history())
1564                                 goto rewrite_line;
1565                         break;
1566                 case CTRL('P'):
1567                 vi_case(CTRL('P')|vbit:)
1568                 vi_case('k'|vbit:)
1569                         /* Control-p -- Get previous command from history */
1570                         if (get_previous_history())
1571                                 goto rewrite_line;
1572                         break;
1573 #endif
1574
1575                 case CTRL('U'):
1576                 vi_case(CTRL('U')|vbit:)
1577                         /* Control-U -- Clear line before cursor */
1578                         if (cursor) {
1579                                 overlapping_strcpy(command, command + cursor);
1580                                 command_len -= cursor;
1581                                 redraw(cmdedit_y, command_len);
1582                         }
1583                         break;
1584                 case CTRL('W'):
1585                 vi_case(CTRL('W')|vbit:)
1586                         /* Control-W -- Remove the last word */
1587                         while (cursor > 0 && isspace(command[cursor-1]))
1588                                 input_backspace();
1589                         while (cursor > 0 && !isspace(command[cursor-1]))
1590                                 input_backspace();
1591                         break;
1592
1593 #if ENABLE_FEATURE_EDITING_VI
1594                 case 'i'|vbit:
1595                         vi_cmdmode = 0;
1596                         break;
1597                 case 'I'|vbit:
1598                         input_backward(cursor);
1599                         vi_cmdmode = 0;
1600                         break;
1601                 case 'a'|vbit:
1602                         input_forward();
1603                         vi_cmdmode = 0;
1604                         break;
1605                 case 'A'|vbit:
1606                         input_end();
1607                         vi_cmdmode = 0;
1608                         break;
1609                 case 'x'|vbit:
1610                         input_delete(1);
1611                         break;
1612                 case 'X'|vbit:
1613                         if (cursor > 0) {
1614                                 input_backward(1);
1615                                 input_delete(1);
1616                         }
1617                         break;
1618                 case 'W'|vbit:
1619                         vi_Word_motion(command, 1);
1620                         break;
1621                 case 'w'|vbit:
1622                         vi_word_motion(command, 1);
1623                         break;
1624                 case 'E'|vbit:
1625                         vi_End_motion(command);
1626                         break;
1627                 case 'e'|vbit:
1628                         vi_end_motion(command);
1629                         break;
1630                 case 'B'|vbit:
1631                         vi_Back_motion(command);
1632                         break;
1633                 case 'b'|vbit:
1634                         vi_back_motion(command);
1635                         break;
1636                 case 'C'|vbit:
1637                         vi_cmdmode = 0;
1638                         /* fall through */
1639                 case 'D'|vbit:
1640                         goto clear_to_eol;
1641
1642                 case 'c'|vbit:
1643                         vi_cmdmode = 0;
1644                         /* fall through */
1645                 case 'd'|vbit: {
1646                         int nc, sc;
1647                         sc = cursor;
1648                         prevc = ic;
1649                         if (safe_read(STDIN_FILENO, &c, 1) < 1)
1650                                 goto prepare_to_die;
1651                         if (c == (prevc & 0xff)) {
1652                                 /* "cc", "dd" */
1653                                 input_backward(cursor);
1654                                 goto clear_to_eol;
1655                                 break;
1656                         }
1657                         switch (c) {
1658                         case 'w':
1659                         case 'W':
1660                         case 'e':
1661                         case 'E':
1662                                 switch (c) {
1663                                 case 'w':   /* "dw", "cw" */
1664                                         vi_word_motion(command, vi_cmdmode);
1665                                         break;
1666                                 case 'W':   /* 'dW', 'cW' */
1667                                         vi_Word_motion(command, vi_cmdmode);
1668                                         break;
1669                                 case 'e':   /* 'de', 'ce' */
1670                                         vi_end_motion(command);
1671                                         input_forward();
1672                                         break;
1673                                 case 'E':   /* 'dE', 'cE' */
1674                                         vi_End_motion(command);
1675                                         input_forward();
1676                                         break;
1677                                 }
1678                                 nc = cursor;
1679                                 input_backward(cursor - sc);
1680                                 while (nc-- > cursor)
1681                                         input_delete(1);
1682                                 break;
1683                         case 'b':  /* "db", "cb" */
1684                         case 'B':  /* implemented as B */
1685                                 if (c == 'b')
1686                                         vi_back_motion(command);
1687                                 else
1688                                         vi_Back_motion(command);
1689                                 while (sc-- > cursor)
1690                                         input_delete(1);
1691                                 break;
1692                         case ' ':  /* "d ", "c " */
1693                                 input_delete(1);
1694                                 break;
1695                         case '$':  /* "d$", "c$" */
1696                         clear_to_eol:
1697                                 while (cursor < command_len)
1698                                         input_delete(1);
1699                                 break;
1700                         }
1701                         break;
1702                 }
1703                 case 'p'|vbit:
1704                         input_forward();
1705                         /* fallthrough */
1706                 case 'P'|vbit:
1707                         put();
1708                         break;
1709                 case 'r'|vbit:
1710                         if (safe_read(STDIN_FILENO, &c, 1) < 1)
1711                                 goto prepare_to_die;
1712                         if (c == 0)
1713                                 beep();
1714                         else {
1715                                 *(command + cursor) = c;
1716                                 bb_putchar(c);
1717                                 bb_putchar('\b');
1718                         }
1719                         break;
1720 #endif /* FEATURE_COMMAND_EDITING_VI */
1721
1722                 case '\x1b': /* ESC */
1723
1724 #if ENABLE_FEATURE_EDITING_VI
1725                         if (state->flags & VI_MODE) {
1726                                 /* ESC: insert mode --> command mode */
1727                                 vi_cmdmode = 1;
1728                                 input_backward(1);
1729                                 break;
1730                         }
1731 #endif
1732                         /* escape sequence follows */
1733                         if (safe_read(STDIN_FILENO, &c, 1) < 1)
1734                                 goto prepare_to_die;
1735                         /* different vt100 emulations */
1736                         if (c == '[' || c == 'O') {
1737                 vi_case('['|vbit:)
1738                 vi_case('O'|vbit:)
1739                                 if (safe_read(STDIN_FILENO, &c, 1) < 1)
1740                                         goto prepare_to_die;
1741                         }
1742                         if (c >= '1' && c <= '9') {
1743                                 unsigned char dummy;
1744
1745                                 if (safe_read(STDIN_FILENO, &dummy, 1) < 1)
1746                                         goto prepare_to_die;
1747                                 if (dummy != '~')
1748                                         c = '\0';
1749                         }
1750
1751                         switch (c) {
1752 #if ENABLE_FEATURE_TAB_COMPLETION
1753                         case '\t':                      /* Alt-Tab */
1754                                 input_tab(&lastWasTab);
1755                                 break;
1756 #endif
1757 #if MAX_HISTORY > 0
1758                         case 'A':
1759                                 /* Up Arrow -- Get previous command from history */
1760                                 if (get_previous_history())
1761                                         goto rewrite_line;
1762                                 beep();
1763                                 break;
1764                         case 'B':
1765                                 /* Down Arrow -- Get next command in history */
1766                                 if (!get_next_history())
1767                                         break;
1768  rewrite_line:
1769                                 /* Rewrite the line with the selected history item */
1770                                 /* change command */
1771                                 command_len = strlen(strcpy(command, state->history[state->cur_history] ? : ""));
1772                                 /* redraw and go to eol (bol, in vi */
1773                                 redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0);
1774                                 break;
1775 #endif
1776                         case 'C':
1777                                 /* Right Arrow -- Move forward one character */
1778                                 input_forward();
1779                                 break;
1780                         case 'D':
1781                                 /* Left Arrow -- Move back one character */
1782                                 input_backward(1);
1783                                 break;
1784                         case '3':
1785                                 /* Delete */
1786                                 input_delete(0);
1787                                 break;
1788                         case '1': // vt100? linux vt? or what?
1789                         case '7': // vt100? linux vt? or what?
1790                         case 'H': /* xterm's <Home> */
1791                                 input_backward(cursor);
1792                                 break;
1793                         case '4': // vt100? linux vt? or what?
1794                         case '8': // vt100? linux vt? or what?
1795                         case 'F': /* xterm's <End> */
1796                                 input_end();
1797                                 break;
1798                         default:
1799                                 c = '\0';
1800                                 beep();
1801                         }
1802                         break;
1803
1804                 default:        /* If it's regular input, do the normal thing */
1805
1806                         /* Control-V -- force insert of next char */
1807                         if (c == CTRL('V')) {
1808                                 if (safe_read(STDIN_FILENO, &c, 1) < 1)
1809                                         goto prepare_to_die;
1810                                 if (c == 0) {
1811                                         beep();
1812                                         break;
1813                                 }
1814                         }
1815
1816 #if ENABLE_FEATURE_EDITING_VI
1817                         if (vi_cmdmode)  /* Don't self-insert */
1818                                 break;
1819 #endif
1820                         if ((int)command_len >= (maxsize - 2))        /* Need to leave space for enter */
1821                                 break;
1822
1823                         command_len++;
1824                         if (cursor == (command_len - 1)) {      /* Append if at the end of the line */
1825                                 command[cursor] = c;
1826                                 command[cursor+1] = '\0';
1827                                 cmdedit_set_out_char(' ');
1828                         } else {                        /* Insert otherwise */
1829                                 int sc = cursor;
1830
1831                                 memmove(command + sc + 1, command + sc, command_len - sc);
1832                                 command[sc] = c;
1833                                 sc++;
1834                                 /* rewrite from cursor */
1835                                 input_end();
1836                                 /* to prev x pos + 1 */
1837                                 input_backward(cursor - sc);
1838                         }
1839                         break;
1840                 }
1841                 if (break_out)                  /* Enter is the command terminator, no more input. */
1842                         break;
1843
1844 #if ENABLE_FEATURE_TAB_COMPLETION
1845                 if (c != '\t')
1846                         lastWasTab = FALSE;
1847 #endif
1848         }
1849
1850         if (command_len > 0)
1851                 remember_in_history(command);
1852
1853         if (break_out > 0) {
1854                 command[command_len++] = '\n';
1855                 command[command_len] = '\0';
1856         }
1857
1858 #if ENABLE_FEATURE_TAB_COMPLETION
1859         free_tab_completion_data();
1860 #endif
1861
1862         /* restore initial_settings */
1863         tcsetattr_stdin_TCSANOW(&initial_settings);
1864         /* restore SIGWINCH handler */
1865         signal(SIGWINCH, previous_SIGWINCH_handler);
1866         fflush(stdout);
1867
1868         len = command_len;
1869         DEINIT_S();
1870
1871         return len; /* can't return command_len, DEINIT_S() destroys it */
1872 }
1873
1874 line_input_t* FAST_FUNC new_line_input_t(int flags)
1875 {
1876         line_input_t *n = xzalloc(sizeof(*n));
1877         n->flags = flags;
1878         return n;
1879 }
1880
1881 #else
1882
1883 #undef read_line_input
1884 int FAST_FUNC read_line_input(const char* prompt, char* command, int maxsize)
1885 {
1886         fputs(prompt, stdout);
1887         fflush(stdout);
1888         fgets(command, maxsize, stdin);
1889         return strlen(command);
1890 }
1891
1892 #endif  /* FEATURE_COMMAND_EDITING */
1893
1894
1895 /*
1896  * Testing
1897  */
1898
1899 #ifdef TEST
1900
1901 #include <locale.h>
1902
1903 const char *applet_name = "debug stuff usage";
1904
1905 int main(int argc, char **argv)
1906 {
1907         char buff[MAX_LINELEN];
1908         char *prompt =
1909 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
1910                 "\\[\\033[32;1m\\]\\u@\\[\\x1b[33;1m\\]\\h:"
1911                 "\\[\\033[34;1m\\]\\w\\[\\033[35;1m\\] "
1912                 "\\!\\[\\e[36;1m\\]\\$ \\[\\E[0m\\]";
1913 #else
1914                 "% ";
1915 #endif
1916
1917 #if ENABLE_FEATURE_NONPRINTABLE_INVERSE_PUT
1918         setlocale(LC_ALL, "");
1919 #endif
1920         while (1) {
1921                 int l;
1922                 l = read_line_input(prompt, buff);
1923                 if (l <= 0 || buff[l-1] != '\n')
1924                         break;
1925                 buff[l-1] = 0;
1926                 printf("*** read_line_input() returned line =%s=\n", buff);
1927         }
1928         printf("*** read_line_input() detect ^D\n");
1929         return 0;
1930 }
1931
1932 #endif  /* TEST */