contrib/libedit/readline.c

   1 /*      $NetBSD: readline.c,v 1.159 2019/10/09 14:31:07 christos Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jaromir Dolecek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "config.h"
  33 #if !defined(lint) && !defined(SCCSID)
  34 __RCSID("$NetBSD: readline.c,v 1.159 2019/10/09 14:31:07 christos Exp $");
  35 #endif /* not lint && not SCCSID */
  36
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <ctype.h>
  40 #include <dirent.h>
  41 #include <errno.h>
  42 #include <fcntl.h>
  43 #include <limits.h>
  44 #include <pwd.h>
  45 #include <setjmp.h>
  46 #include <stdint.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <vis.h>
  52
  53 #include "readline/readline.h"
  54 #include "el.h"
  55 #include "fcns.h"
  56 #include "filecomplete.h"
  57
  58 void rl_prep_terminal(int);
  59 void rl_deprep_terminal(void);
  60
  61 /* for rl_complete() */
  62 #define TAB             '\r'
  63
  64 /* see comment at the #ifdef for sense of this */
  65 /* #define GDB_411_HACK */
  66
  67 /* readline compatibility stuff - look at readline sources/documentation */
  68 /* to see what these variables mean */
  69 const char *rl_library_version = "EditLine wrapper";
  70 int rl_readline_version = RL_READLINE_VERSION;
  71 static char empty[] = { '\0' };
  72 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  73 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  74     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  75 const char *rl_readline_name = empty;
  76 FILE *rl_instream = NULL;
  77 FILE *rl_outstream = NULL;
  78 int rl_point = 0;
  79 int rl_end = 0;
  80 char *rl_line_buffer = NULL;
  81 rl_vcpfunc_t *rl_linefunc = NULL;
  82 int rl_done = 0;
  83 rl_hook_func_t *rl_event_hook = NULL;
  84 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  85     emacs_meta_keymap,
  86     emacs_ctlx_keymap;
  87 /*
  88  * The following is not implemented; we always catch signals in the
  89  * libedit fashion: set handlers on entry to el_gets() and clear them
  90  * on the way out. This simplistic approach works for most cases; if
  91  * it does not work for your application, please let us know.
  92  */
  93 int rl_catch_signals = 1;
  94 int rl_catch_sigwinch = 1;
  95
  96 int history_base = 1;           /* probably never subject to change */
  97 int history_length = 0;
  98 int history_offset = 0;
  99 int max_input_history = 0;
 100 char history_expansion_char = '!';
 101 char history_subst_char = '^';
 102 char *history_no_expand_chars = expand_chars;
 103 Function *history_inhibit_expansion_function = NULL;
 104 char *history_arg_extract(int start, int end, const char *str);
 105
 106 int rl_inhibit_completion = 0;
 107 int rl_attempted_completion_over = 0;
 108 const char *rl_basic_word_break_characters = break_chars;
 109 char *rl_completer_word_break_characters = NULL;
 110 const char *rl_completer_quote_characters = NULL;
 111 rl_compentry_func_t *rl_completion_entry_function = NULL;
 112 char *(*rl_completion_word_break_hook)(void) = NULL;
 113 rl_completion_func_t *rl_attempted_completion_function = NULL;
 114 Function *rl_pre_input_hook = NULL;
 115 Function *rl_startup1_hook = NULL;
 116 int (*rl_getc_function)(FILE *) = NULL;
 117 char *rl_terminal_name = NULL;
 118 int rl_already_prompted = 0;
 119 int rl_filename_completion_desired = 0;
 120 int rl_ignore_completion_duplicates = 0;
 121 int readline_echoing_p = 1;
 122 int _rl_print_completions_horizontally = 0;
 123 VFunction *rl_redisplay_function = NULL;
 124 Function *rl_startup_hook = NULL;
 125 int rl_did_startup_hook = 0;
 126 VFunction *rl_completion_display_matches_hook = NULL;
 127 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 128 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 129 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 130
 131 /*
 132  * The current prompt string.
 133  */
 134 char *rl_prompt = NULL;
 135 /*
 136  * This is set to character indicating type of completion being done by
 137  * rl_complete_internal(); this is available for application completion
 138  * functions.
 139  */
 140 int rl_completion_type = 0;
 141
 142 /*
 143  * If more than this number of items results from query for possible
 144  * completions, we ask user if they are sure to really display the list.
 145  */
 146 int rl_completion_query_items = 100;
 147
 148 /*
 149  * List of characters which are word break characters, but should be left
 150  * in the parsed text when it is passed to the completion function.
 151  * Shell uses this to help determine what kind of completing to do.
 152  */
 153 const char *rl_special_prefixes = NULL;
 154
 155 /*
 156  * This is the character appended to the completed words if at the end of
 157  * the line. Default is ' ' (a space).
 158  */
 159 int rl_completion_append_character = ' ';
 160
 161 /* stuff below is used internally by libedit for readline emulation */
 162
 163 static History *h = NULL;
 164 static EditLine *e = NULL;
 165 static rl_command_func_t *map[256];
 166 static jmp_buf topbuf;
 167
 168 /* internal functions */
 169 static unsigned char     _el_rl_complete(EditLine *, int);
 170 static unsigned char     _el_rl_tstp(EditLine *, int);
 171 static char             *_get_prompt(EditLine *);
 172 static int               _getc_function(EditLine *, wchar_t *);
 173 static int               _history_expand_command(const char *, size_t, size_t,
 174     char **);
 175 static char             *_rl_compat_sub(const char *, const char *,
 176     const char *, int);
 177 static int               _rl_event_read_char(EditLine *, wchar_t *);
 178 static void              _rl_update_pos(void);
 179
 180 static HIST_ENTRY rl_he;
 181
 182 /* ARGSUSED */
 183 static char *
 184 _get_prompt(EditLine *el __attribute__((__unused__)))
 185 {
 186         rl_already_prompted = 1;
 187         return rl_prompt;
 188 }
 189
 190
 191 /*
 192  * read one key from user defined input function
 193  */
 194 static int
 195 /*ARGSUSED*/
 196 _getc_function(EditLine *el __attribute__((__unused__)), wchar_t *c)
 197 {
 198         int i;
 199
 200         i = (*rl_getc_function)(rl_instream);
 201         if (i == -1)
 202                 return 0;
 203         *c = (wchar_t)i;
 204         return 1;
 205 }
 206
 207 static void
 208 _resize_fun(EditLine *el, void *a)
 209 {
 210         const LineInfo *li;
 211         char **ap = a;
 212
 213         li = el_line(el);
 214         /* a cheesy way to get rid of const cast. */
 215         *ap = memchr(li->buffer, *li->buffer, (size_t)1);
 216 }
 217
 218 static const char *
 219 _default_history_file(void)
 220 {
 221         struct passwd *p;
 222         static char *path;
 223         size_t len;
 224
 225         if (path)
 226                 return path;
 227
 228         if ((p = getpwuid(getuid())) == NULL)
 229                 return NULL;
 230
 231         len = strlen(p->pw_dir) + sizeof("/.history");
 232         if ((path = malloc(len)) == NULL)
 233                 return NULL;
 234
 235         (void)snprintf(path, len, "%s/.history", p->pw_dir);
 236         return path;
 237 }
 238
 239 /*
 240  * READLINE compatibility stuff
 241  */
 242
 243 /*
 244  * Set the prompt
 245  */
 246 int
 247 rl_set_prompt(const char *prompt)
 248 {
 249         char *p;
 250
 251         if (!prompt)
 252                 prompt = "";
 253         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 254                 return 0;
 255         if (rl_prompt)
 256                 el_free(rl_prompt);
 257         rl_prompt = strdup(prompt);
 258         if (rl_prompt == NULL)
 259                 return -1;
 260
 261         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL) {
 262                 /* Remove adjacent end/start markers to avoid double-escapes. */
 263                 if (p[1] == RL_PROMPT_START_IGNORE) {
 264                         memmove(p, p + 2, 1 + strlen(p + 2));
 265                 } else {
 266                         *p = RL_PROMPT_START_IGNORE;
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272
 273 /*
 274  * initialize rl compat stuff
 275  */
 276 int
 277 rl_initialize(void)
 278 {
 279         HistEvent ev;
 280         int editmode = 1;
 281         struct termios t;
 282
 283         if (e != NULL)
 284                 el_end(e);
 285         if (h != NULL)
 286                 history_end(h);
 287
 288         if (!rl_instream)
 289                 rl_instream = stdin;
 290         if (!rl_outstream)
 291                 rl_outstream = stdout;
 292
 293         /*
 294          * See if we don't really want to run the editor
 295          */
 296         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 297                 editmode = 0;
 298
 299         e = el_init_internal(rl_readline_name, rl_instream, rl_outstream,
 300             stderr, fileno(rl_instream), fileno(rl_outstream), fileno(stderr),
 301             NO_RESET);
 302
 303         if (!editmode)
 304                 el_set(e, EL_EDITMODE, 0);
 305
 306         h = history_init();
 307         if (!e || !h)
 308                 return -1;
 309
 310         history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
 311         history_length = 0;
 312         max_input_history = INT_MAX;
 313         el_set(e, EL_HIST, history, h);
 314
 315         /* Setup resize function */
 316         el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
 317
 318         /* setup getc function if valid */
 319         if (rl_getc_function)
 320                 el_set(e, EL_GETCFN, _getc_function);
 321
 322         /* for proper prompt printing in readline() */
 323         if (rl_set_prompt("") == -1) {
 324                 history_end(h);
 325                 el_end(e);
 326                 return -1;
 327         }
 328         el_set(e, EL_PROMPT_ESC, _get_prompt, RL_PROMPT_START_IGNORE);
 329         el_set(e, EL_SIGNAL, rl_catch_signals);
 330
 331         /* set default mode to "emacs"-style and read setting afterwards */
 332         /* so this can be overridden */
 333         el_set(e, EL_EDITOR, "emacs");
 334         if (rl_terminal_name != NULL)
 335                 el_set(e, EL_TERMINAL, rl_terminal_name);
 336         else
 337                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 338
 339         /*
 340          * Word completion - this has to go AFTER rebinding keys
 341          * to emacs-style.
 342          */
 343         el_set(e, EL_ADDFN, "rl_complete",
 344             "ReadLine compatible completion function",
 345             _el_rl_complete);
 346         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 347
 348         /*
 349          * Send TSTP when ^Z is pressed.
 350          */
 351         el_set(e, EL_ADDFN, "rl_tstp",
 352             "ReadLine compatible suspend function",
 353             _el_rl_tstp);
 354         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 355
 356         /*
 357          * Set some readline compatible key-bindings.
 358          */
 359         el_set(e, EL_BIND, "^R", "em-inc-search-prev", NULL);
 360
 361         /*
 362          * Allow the use of Home/End keys.
 363          */
 364         el_set(e, EL_BIND, "\\e[1~", "ed-move-to-beg", NULL);
 365         el_set(e, EL_BIND, "\\e[4~", "ed-move-to-end", NULL);
 366         el_set(e, EL_BIND, "\\e[7~", "ed-move-to-beg", NULL);
 367         el_set(e, EL_BIND, "\\e[8~", "ed-move-to-end", NULL);
 368         el_set(e, EL_BIND, "\\e[H", "ed-move-to-beg", NULL);
 369         el_set(e, EL_BIND, "\\e[F", "ed-move-to-end", NULL);
 370
 371         /*
 372          * Allow the use of the Delete/Insert keys.
 373          */
 374         el_set(e, EL_BIND, "\\e[3~", "ed-delete-next-char", NULL);
 375         el_set(e, EL_BIND, "\\e[2~", "ed-quoted-insert", NULL);
 376
 377         /*
 378          * Ctrl-left-arrow and Ctrl-right-arrow for word moving.
 379          */
 380         el_set(e, EL_BIND, "\\e[1;5C", "em-next-word", NULL);
 381         el_set(e, EL_BIND, "\\e[1;5D", "ed-prev-word", NULL);
 382         el_set(e, EL_BIND, "\\e[5C", "em-next-word", NULL);
 383         el_set(e, EL_BIND, "\\e[5D", "ed-prev-word", NULL);
 384         el_set(e, EL_BIND, "\\e\\e[C", "em-next-word", NULL);
 385         el_set(e, EL_BIND, "\\e\\e[D", "ed-prev-word", NULL);
 386
 387         /* read settings from configuration file */
 388         el_source(e, NULL);
 389
 390         /*
 391          * Unfortunately, some applications really do use rl_point
 392          * and rl_line_buffer directly.
 393          */
 394         _resize_fun(e, &rl_line_buffer);
 395         _rl_update_pos();
 396
 397         tty_end(e, TCSADRAIN);
 398
 399         return 0;
 400 }
 401
 402
 403 /*
 404  * read one line from input stream and return it, chomping
 405  * trailing newline (if there is any)
 406  */
 407 char *
 408 readline(const char *p)
 409 {
 410         HistEvent ev;
 411         const char * volatile prompt = p;
 412         int count;
 413         const char *ret;
 414         char *buf;
 415         static int used_event_hook;
 416
 417         if (e == NULL || h == NULL)
 418                 rl_initialize();
 419         if (rl_did_startup_hook == 0 && rl_startup_hook) {
 420                 rl_did_startup_hook = 1;
 421                 (*rl_startup_hook)(NULL, 0);
 422         }
 423         tty_init(e);
 424
 425
 426         rl_done = 0;
 427
 428         (void)setjmp(topbuf);
 429         buf = NULL;
 430
 431         /* update prompt accordingly to what has been passed */
 432         if (rl_set_prompt(prompt) == -1)
 433                 goto out;
 434
 435         if (rl_pre_input_hook)
 436                 (*rl_pre_input_hook)(NULL, 0);
 437
 438         if (rl_event_hook && !(e->el_flags & NO_TTY)) {
 439                 el_set(e, EL_GETCFN, _rl_event_read_char);
 440                 used_event_hook = 1;
 441         }
 442
 443         if (!rl_event_hook && used_event_hook) {
 444                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 445                 used_event_hook = 0;
 446         }
 447
 448         rl_already_prompted = 0;
 449
 450         /* get one line from input stream */
 451         ret = el_gets(e, &count);
 452
 453         if (ret && count > 0) {
 454                 int lastidx;
 455
 456                 buf = strdup(ret);
 457                 if (buf == NULL)
 458                         goto out;
 459                 lastidx = count - 1;
 460                 if (buf[lastidx] == '\n')
 461                         buf[lastidx] = '\0';
 462         } else
 463                 buf = NULL;
 464
 465         history(h, &ev, H_GETSIZE);
 466         history_length = ev.num;
 467
 468 out:
 469         tty_end(e, TCSADRAIN);
 470         return buf;
 471 }
 472
 473 /*
 474  * history functions
 475  */
 476
 477 /*
 478  * is normally called before application starts to use
 479  * history expansion functions
 480  */
 481 void
 482 using_history(void)
 483 {
 484         if (h == NULL || e == NULL)
 485                 rl_initialize();
 486         history_offset = history_length;
 487 }
 488
 489
 490 /*
 491  * substitute ``what'' with ``with'', returning resulting string; if
 492  * globally == 1, substitutes all occurrences of what, otherwise only the
 493  * first one
 494  */
 495 static char *
 496 _rl_compat_sub(const char *str, const char *what, const char *with,
 497     int globally)
 498 {
 499         const   char    *s;
 500         char    *r, *result;
 501         size_t  len, with_len, what_len;
 502
 503         len = strlen(str);
 504         with_len = strlen(with);
 505         what_len = strlen(what);
 506
 507         /* calculate length we need for result */
 508         s = str;
 509         while (*s) {
 510                 if (*s == *what && !strncmp(s, what, what_len)) {
 511                         len += with_len - what_len;
 512                         if (!globally)
 513                                 break;
 514                         s += what_len;
 515                 } else
 516                         s++;
 517         }
 518         r = result = el_calloc(len + 1, sizeof(*r));
 519         if (result == NULL)
 520                 return NULL;
 521         s = str;
 522         while (*s) {
 523                 if (*s == *what && !strncmp(s, what, what_len)) {
 524                         memcpy(r, with, with_len);
 525                         r += with_len;
 526                         s += what_len;
 527                         if (!globally) {
 528                                 (void)strcpy(r, s);
 529                                 return result;
 530                         }
 531                 } else
 532                         *r++ = *s++;
 533         }
 534         *r = '\0';
 535         return result;
 536 }
 537
 538 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 539 static  char    *last_search_match;     /* last !?pat[?] that matched */
 540
 541 const char *
 542 get_history_event(const char *cmd, int *cindex, int qchar)
 543 {
 544         int idx, sign, sub, num, begin, ret;
 545         size_t len;
 546         char    *pat;
 547         const char *rptr;
 548         HistEvent ev;
 549
 550         idx = *cindex;
 551         if (cmd[idx++] != history_expansion_char)
 552                 return NULL;
 553
 554         /* find out which event to take */
 555         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 556                 if (history(h, &ev, H_FIRST) != 0)
 557                         return NULL;
 558                 *cindex = cmd[idx]? (idx + 1):idx;
 559                 return ev.str;
 560         }
 561         sign = 0;
 562         if (cmd[idx] == '-') {
 563                 sign = 1;
 564                 idx++;
 565         }
 566
 567         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 568                 HIST_ENTRY *he;
 569
 570                 num = 0;
 571                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 572                         num = num * 10 + cmd[idx] - '0';
 573                         idx++;
 574                 }
 575                 if (sign)
 576                         num = history_length - num + history_base;
 577
 578                 if (!(he = history_get(num)))
 579                         return NULL;
 580
 581                 *cindex = idx;
 582                 return he->line;
 583         }
 584         sub = 0;
 585         if (cmd[idx] == '?') {
 586                 sub = 1;
 587                 idx++;
 588         }
 589         begin = idx;
 590         while (cmd[idx]) {
 591                 if (cmd[idx] == '\n')
 592                         break;
 593                 if (sub && cmd[idx] == '?')
 594                         break;
 595                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 596                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 597                         break;
 598                 idx++;
 599         }
 600         len = (size_t)idx - (size_t)begin;
 601         if (sub && cmd[idx] == '?')
 602                 idx++;
 603         if (sub && len == 0 && last_search_pat && *last_search_pat)
 604                 pat = last_search_pat;
 605         else if (len == 0)
 606                 return NULL;
 607         else {
 608                 if ((pat = el_calloc(len + 1, sizeof(*pat))) == NULL)
 609                         return NULL;
 610                 (void)strlcpy(pat, cmd + begin, len + 1);
 611         }
 612
 613         if (history(h, &ev, H_CURR) != 0) {
 614                 if (pat != last_search_pat)
 615                         el_free(pat);
 616                 return NULL;
 617         }
 618         num = ev.num;
 619
 620         if (sub) {
 621                 if (pat != last_search_pat) {
 622                         if (last_search_pat)
 623                                 el_free(last_search_pat);
 624                         last_search_pat = pat;
 625                 }
 626                 ret = history_search(pat, -1);
 627         } else
 628                 ret = history_search_prefix(pat, -1);
 629
 630         if (ret == -1) {
 631                 /* restore to end of list on failed search */
 632                 history(h, &ev, H_FIRST);
 633                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 634                 if (pat != last_search_pat)
 635                         el_free(pat);
 636                 return NULL;
 637         }
 638
 639         if (sub && len) {
 640                 if (last_search_match && last_search_match != pat)
 641                         el_free(last_search_match);
 642                 last_search_match = pat;
 643         }
 644
 645         if (pat != last_search_pat)
 646                 el_free(pat);
 647
 648         if (history(h, &ev, H_CURR) != 0)
 649                 return NULL;
 650         *cindex = idx;
 651         rptr = ev.str;
 652
 653         /* roll back to original position */
 654         (void)history(h, &ev, H_SET, num);
 655
 656         return rptr;
 657 }
 658
 659 /*
 660  * the real function doing history expansion - takes as argument command
 661  * to do and data upon which the command should be executed
 662  * does expansion the way I've understood readline documentation
 663  *
 664  * returns 0 if data was not modified, 1 if it was and 2 if the string
 665  * should be only printed and not executed; in case of error,
 666  * returns -1 and *result points to NULL
 667  * it's the caller's responsibility to free() the string returned in *result
 668  */
 669 static int
 670 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 671     char **result)
 672 {
 673         char *tmp, *search = NULL, *aptr;
 674         const char *ptr, *cmd;
 675         static char *from = NULL, *to = NULL;
 676         int start, end, idx, has_mods = 0;
 677         int p_on = 0, g_on = 0;
 678
 679         *result = NULL;
 680         aptr = NULL;
 681         ptr = NULL;
 682
 683         /* First get event specifier */
 684         idx = 0;
 685
 686         if (strchr(":^*$", command[offs + 1])) {
 687                 char str[4];
 688                 /*
 689                 * "!:" is shorthand for "!!:".
 690                 * "!^", "!*" and "!$" are shorthand for
 691                 * "!!:^", "!!:*" and "!!:$" respectively.
 692                 */
 693                 str[0] = str[1] = '!';
 694                 str[2] = '0';
 695                 ptr = get_history_event(str, &idx, 0);
 696                 idx = (command[offs + 1] == ':')? 1:0;
 697                 has_mods = 1;
 698         } else {
 699                 if (command[offs + 1] == '#') {
 700                         /* use command so far */
 701                         if ((aptr = el_calloc(offs + 1, sizeof(*aptr)))
 702                             == NULL)
 703                                 return -1;
 704                         (void)strlcpy(aptr, command, offs + 1);
 705                         idx = 1;
 706                 } else {
 707                         int     qchar;
 708
 709                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 710                         ptr = get_history_event(command + offs, &idx, qchar);
 711                 }
 712                 has_mods = command[offs + (size_t)idx] == ':';
 713         }
 714
 715         if (ptr == NULL && aptr == NULL)
 716                 return -1;
 717
 718         if (!has_mods) {
 719                 *result = strdup(aptr ? aptr : ptr);
 720                 if (aptr)
 721                         el_free(aptr);
 722                 if (*result == NULL)
 723                         return -1;
 724                 return 1;
 725         }
 726
 727         cmd = command + offs + idx + 1;
 728
 729         /* Now parse any word designators */
 730
 731         if (*cmd == '%')        /* last word matched by ?pat? */
 732                 tmp = strdup(last_search_match? last_search_match:"");
 733         else if (strchr("^*$-0123456789", *cmd)) {
 734                 start = end = -1;
 735                 if (*cmd == '^')
 736                         start = end = 1, cmd++;
 737                 else if (*cmd == '$')
 738                         start = -1, cmd++;
 739                 else if (*cmd == '*')
 740                         start = 1, cmd++;
 741                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 742                         start = 0;
 743                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 744                                 start = start * 10 + *cmd++ - '0';
 745
 746                         if (*cmd == '-') {
 747                                 if (isdigit((unsigned char) cmd[1])) {
 748                                         cmd++;
 749                                         end = 0;
 750                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 751                                                 end = end * 10 + *cmd++ - '0';
 752                                 } else if (cmd[1] == '$') {
 753                                         cmd += 2;
 754                                         end = -1;
 755                                 } else {
 756                                         cmd++;
 757                                         end = -2;
 758                                 }
 759                         } else if (*cmd == '*')
 760                                 end = -1, cmd++;
 761                         else
 762                                 end = start;
 763                 }
 764                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 765                 if (tmp == NULL) {
 766                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 767                             command + offs + idx);
 768                         if (aptr)
 769                                 el_free(aptr);
 770                         return -1;
 771                 }
 772         } else
 773                 tmp = strdup(aptr? aptr:ptr);
 774
 775         if (aptr)
 776                 el_free(aptr);
 777
 778         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 779                 *result = tmp;
 780                 return 1;
 781         }
 782
 783         for (; *cmd; cmd++) {
 784                 if (*cmd == ':')
 785                         continue;
 786                 else if (*cmd == 'h') {         /* remove trailing path */
 787                         if ((aptr = strrchr(tmp, '/')) != NULL)
 788                                 *aptr = '\0';
 789                 } else if (*cmd == 't') {       /* remove leading path */
 790                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 791                                 aptr = strdup(aptr + 1);
 792                                 el_free(tmp);
 793                                 tmp = aptr;
 794                         }
 795                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 796                         if ((aptr = strrchr(tmp, '.')) != NULL)
 797                                 *aptr = '\0';
 798                 } else if (*cmd == 'e') {       /* remove all but suffix */
 799                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 800                                 aptr = strdup(aptr);
 801                                 el_free(tmp);
 802                                 tmp = aptr;
 803                         }
 804                 } else if (*cmd == 'p')         /* print only */
 805                         p_on = 1;
 806                 else if (*cmd == 'g')
 807                         g_on = 2;
 808                 else if (*cmd == 's' || *cmd == '&') {
 809                         char *what, *with, delim;
 810                         size_t len, from_len;
 811                         size_t size;
 812
 813                         if (*cmd == '&' && (from == NULL || to == NULL))
 814                                 continue;
 815                         else if (*cmd == 's') {
 816                                 delim = *(++cmd), cmd++;
 817                                 size = 16;
 818                                 what = el_realloc(from, size * sizeof(*what));
 819                                 if (what == NULL) {
 820                                         el_free(from);
 821                                         el_free(tmp);
 822                                         return 0;
 823                                 }
 824                                 len = 0;
 825                                 for (; *cmd && *cmd != delim; cmd++) {
 826                                         if (*cmd == '\\' && cmd[1] == delim)
 827                                                 cmd++;
 828                                         if (len >= size) {
 829                                                 char *nwhat;
 830                                                 nwhat = el_realloc(what,
 831                                                     (size <<= 1) *
 832                                                     sizeof(*nwhat));
 833                                                 if (nwhat == NULL) {
 834                                                         el_free(what);
 835                                                         el_free(tmp);
 836                                                         return 0;
 837                                                 }
 838                                                 what = nwhat;
 839                                         }
 840                                         what[len++] = *cmd;
 841                                 }
 842                                 what[len] = '\0';
 843                                 from = what;
 844                                 if (*what == '\0') {
 845                                         el_free(what);
 846                                         if (search) {
 847                                                 from = strdup(search);
 848                                                 if (from == NULL) {
 849                                                         el_free(tmp);
 850                                                         return 0;
 851                                                 }
 852                                         } else {
 853                                                 from = NULL;
 854                                                 el_free(tmp);
 855                                                 return -1;
 856                                         }
 857                                 }
 858                                 cmd++;  /* shift after delim */
 859                                 if (!*cmd)
 860                                         continue;
 861
 862                                 size = 16;
 863                                 with = el_realloc(to, size * sizeof(*with));
 864                                 if (with == NULL) {
 865                                         el_free(to);
 866                                         el_free(tmp);
 867                                         return -1;
 868                                 }
 869                                 len = 0;
 870                                 from_len = strlen(from);
 871                                 for (; *cmd && *cmd != delim; cmd++) {
 872                                         if (len + from_len + 1 >= size) {
 873                                                 char *nwith;
 874                                                 size += from_len + 1;
 875                                                 nwith = el_realloc(with,
 876                                                     size * sizeof(*nwith));
 877                                                 if (nwith == NULL) {
 878                                                         el_free(with);
 879                                                         el_free(tmp);
 880                                                         return -1;
 881                                                 }
 882                                                 with = nwith;
 883                                         }
 884                                         if (*cmd == '&') {
 885                                                 /* safe */
 886                                                 (void)strcpy(&with[len], from);
 887                                                 len += from_len;
 888                                                 continue;
 889                                         }
 890                                         if (*cmd == '\\'
 891                                             && (*(cmd + 1) == delim
 892                                                 || *(cmd + 1) == '&'))
 893                                                 cmd++;
 894                                         with[len++] = *cmd;
 895                                 }
 896                                 with[len] = '\0';
 897                                 to = with;
 898                         }
 899
 900                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 901                         if (aptr) {
 902                                 el_free(tmp);
 903                                 tmp = aptr;
 904                         }
 905                         g_on = 0;
 906                 }
 907         }
 908         *result = tmp;
 909         return p_on? 2:1;
 910 }
 911
 912
 913 /*
 914  * csh-style history expansion
 915  */
 916 int
 917 history_expand(char *str, char **output)
 918 {
 919         int ret = 0;
 920         size_t idx, i, size;
 921         char *tmp, *result;
 922
 923         if (h == NULL || e == NULL)
 924                 rl_initialize();
 925
 926         if (history_expansion_char == 0) {
 927                 *output = strdup(str);
 928                 return 0;
 929         }
 930
 931         *output = NULL;
 932         if (str[0] == history_subst_char) {
 933                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 934                 *output = el_calloc(strlen(str) + 4 + 1, sizeof(**output));
 935                 if (*output == NULL)
 936                         return 0;
 937                 (*output)[0] = (*output)[1] = history_expansion_char;
 938                 (*output)[2] = ':';
 939                 (*output)[3] = 's';
 940                 (void)strcpy((*output) + 4, str);
 941                 str = *output;
 942         } else {
 943                 *output = strdup(str);
 944                 if (*output == NULL)
 945                         return 0;
 946         }
 947
 948 #define ADD_STRING(what, len, fr)                                       \
 949         {                                                               \
 950                 if (idx + len + 1 > size) {                             \
 951                         char *nresult = el_realloc(result,              \
 952                             (size += len + 1) * sizeof(*nresult));      \
 953                         if (nresult == NULL) {                          \
 954                                 el_free(*output);                       \
 955                                 if (/*CONSTCOND*/fr)                    \
 956                                         el_free(tmp);                   \
 957                                 return 0;                               \
 958                         }                                               \
 959                         result = nresult;                               \
 960                 }                                                       \
 961                 (void)strlcpy(&result[idx], what, len + 1);             \
 962                 idx += len;                                             \
 963         }
 964
 965         result = NULL;
 966         size = idx = 0;
 967         tmp = NULL;
 968         for (i = 0; str[i];) {
 969                 int qchar, loop_again;
 970                 size_t len, start, j;
 971
 972                 qchar = 0;
 973                 loop_again = 1;
 974                 start = j = i;
 975 loop:
 976                 for (; str[j]; j++) {
 977                         if (str[j] == '\\' &&
 978                             str[j + 1] == history_expansion_char) {
 979                                 len = strlen(&str[j + 1]) + 1;
 980                                 memmove(&str[j], &str[j + 1], len);
 981                                 continue;
 982                         }
 983                         if (!loop_again) {
 984                                 if (isspace((unsigned char) str[j])
 985                                     || str[j] == qchar)
 986                                         break;
 987                         }
 988                         if (str[j] == history_expansion_char
 989                             && !strchr(history_no_expand_chars, str[j + 1])
 990                             && (!history_inhibit_expansion_function ||
 991                             (*history_inhibit_expansion_function)(str,
 992                             (int)j) == 0))
 993                                 break;
 994                 }
 995
 996                 if (str[j] && loop_again) {
 997                         i = j;
 998                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
 999                         j++;
1000                         if (str[j] == history_expansion_char)
1001                                 j++;
1002                         loop_again = 0;
1003                         goto loop;
1004                 }
1005                 len = i - start;
1006                 ADD_STRING(&str[start], len, 0);
1007
1008                 if (str[i] == '\0' || str[i] != history_expansion_char) {
1009                         len = j - i;
1010                         ADD_STRING(&str[i], len, 0);
1011                         if (start == 0)
1012                                 ret = 0;
1013                         else
1014                                 ret = 1;
1015                         break;
1016                 }
1017                 ret = _history_expand_command (str, i, (j - i), &tmp);
1018                 if (ret > 0 && tmp) {
1019                         len = strlen(tmp);
1020                         ADD_STRING(tmp, len, 1);
1021                 }
1022                 if (tmp) {
1023                         el_free(tmp);
1024                         tmp = NULL;
1025                 }
1026                 i = j;
1027         }
1028
1029         /* ret is 2 for "print only" option */
1030         if (ret == 2) {
1031                 add_history(result);
1032 #ifdef GDB_411_HACK
1033                 /* gdb 4.11 has been shipped with readline, where */
1034                 /* history_expand() returned -1 when the line     */
1035                 /* should not be executed; in readline 2.1+       */
1036                 /* it should return 2 in such a case              */
1037                 ret = -1;
1038 #endif
1039         }
1040         el_free(*output);
1041         *output = result;
1042
1043         return ret;
1044 }
1045
1046 /*
1047 * Return a string consisting of arguments of "str" from "start" to "end".
1048 */
1049 char *
1050 history_arg_extract(int start, int end, const char *str)
1051 {
1052         size_t  i, len, max;
1053         char    **arr, *result = NULL;
1054
1055         arr = history_tokenize(str);
1056         if (!arr)
1057                 return NULL;
1058         if (arr && *arr == NULL)
1059                 goto out;
1060
1061         for (max = 0; arr[max]; max++)
1062                 continue;
1063         max--;
1064
1065         if (start == '$')
1066                 start = (int)max;
1067         if (end == '$')
1068                 end = (int)max;
1069         if (end < 0)
1070                 end = (int)max + end + 1;
1071         if (start < 0)
1072                 start = end;
1073
1074         if (start < 0 || end < 0 || (size_t)start > max ||
1075             (size_t)end > max || start > end)
1076                 goto out;
1077
1078         for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1079                 len += strlen(arr[i]) + 1;
1080         len++;
1081         result = el_calloc(len, sizeof(*result));
1082         if (result == NULL)
1083                 goto out;
1084
1085         for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1086                 (void)strcpy(result + len, arr[i]);
1087                 len += strlen(arr[i]);
1088                 if (i < (size_t)end)
1089                         result[len++] = ' ';
1090         }
1091         result[len] = '\0';
1092
1093 out:
1094         for (i = 0; arr[i]; i++)
1095                 el_free(arr[i]);
1096         el_free(arr);
1097
1098         return result;
1099 }
1100
1101 /*
1102  * Parse the string into individual tokens,
1103  * similar to how shell would do it.
1104  */
1105 char **
1106 history_tokenize(const char *str)
1107 {
1108         int size = 1, idx = 0, i, start;
1109         size_t len;
1110         char **result = NULL, *temp, delim = '\0';
1111
1112         for (i = 0; str[i];) {
1113                 while (isspace((unsigned char) str[i]))
1114                         i++;
1115                 start = i;
1116                 for (; str[i];) {
1117                         if (str[i] == '\\') {
1118                                 if (str[i+1] != '\0')
1119                                         i++;
1120                         } else if (str[i] == delim)
1121                                 delim = '\0';
1122                         else if (!delim &&
1123                                     (isspace((unsigned char) str[i]) ||
1124                                 strchr("()<>;&|$", str[i])))
1125                                 break;
1126                         else if (!delim && strchr("'`\"", str[i]))
1127                                 delim = str[i];
1128                         if (str[i])
1129                                 i++;
1130                 }
1131
1132                 if (idx + 2 >= size) {
1133                         char **nresult;
1134                         size <<= 1;
1135                         nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1136                         if (nresult == NULL) {
1137                                 el_free(result);
1138                                 return NULL;
1139                         }
1140                         result = nresult;
1141                 }
1142                 len = (size_t)i - (size_t)start;
1143                 temp = el_calloc(len + 1, sizeof(*temp));
1144                 if (temp == NULL) {
1145                         for (i = 0; i < idx; i++)
1146                                 el_free(result[i]);
1147                         el_free(result);
1148                         return NULL;
1149                 }
1150                 (void)strlcpy(temp, &str[start], len + 1);
1151                 result[idx++] = temp;
1152                 result[idx] = NULL;
1153                 if (str[i])
1154                         i++;
1155         }
1156         return result;
1157 }
1158
1159
1160 /*
1161  * limit size of history record to ``max'' events
1162  */
1163 void
1164 stifle_history(int max)
1165 {
1166         HistEvent ev;
1167         HIST_ENTRY *he;
1168
1169         if (h == NULL || e == NULL)
1170                 rl_initialize();
1171
1172         if (history(h, &ev, H_SETSIZE, max) == 0) {
1173                 max_input_history = max;
1174                 if (history_length > max)
1175                         history_base = history_length - max;
1176                 while (history_length > max) {
1177                         he = remove_history(0);
1178                         el_free(he->data);
1179                         el_free((void *)(unsigned long)he->line);
1180                         el_free(he);
1181                 }
1182         }
1183 }
1184
1185
1186 /*
1187  * "unlimit" size of history - set the limit to maximum allowed int value
1188  */
1189 int
1190 unstifle_history(void)
1191 {
1192         HistEvent ev;
1193         int omax;
1194
1195         history(h, &ev, H_SETSIZE, INT_MAX);
1196         omax = max_input_history;
1197         max_input_history = INT_MAX;
1198         return omax;            /* some value _must_ be returned */
1199 }
1200
1201
1202 int
1203 history_is_stifled(void)
1204 {
1205
1206         /* cannot return true answer */
1207         return max_input_history != INT_MAX;
1208 }
1209
1210 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1211
1212 int
1213 history_truncate_file (const char *filename, int nlines)
1214 {
1215         int ret = 0;
1216         FILE *fp, *tp;
1217         char template[sizeof(_history_tmp_template)];
1218         char buf[4096];
1219         int fd;
1220         char *cp;
1221         off_t off;
1222         int count = 0;
1223         ssize_t left = 0;
1224
1225         if (filename == NULL && (filename = _default_history_file()) == NULL)
1226                 return errno;
1227         if ((fp = fopen(filename, "r+")) == NULL)
1228                 return errno;
1229         strcpy(template, _history_tmp_template);
1230         if ((fd = mkstemp(template)) == -1) {
1231                 ret = errno;
1232                 goto out1;
1233         }
1234
1235         if ((tp = fdopen(fd, "r+")) == NULL) {
1236                 close(fd);
1237                 ret = errno;
1238                 goto out2;
1239         }
1240
1241         for(;;) {
1242                 if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1243                         if (ferror(fp)) {
1244                                 ret = errno;
1245                                 break;
1246                         }
1247                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1248                             (off_t)-1) {
1249                                 ret = errno;
1250                                 break;
1251                         }
1252                         left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1253                         if (ferror(fp)) {
1254                                 ret = errno;
1255                                 break;
1256                         }
1257                         if (left == 0) {
1258                                 count--;
1259                                 left = sizeof(buf);
1260                         } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1261                             != 1) {
1262                                 ret = errno;
1263                                 break;
1264                         }
1265                         fflush(tp);
1266                         break;
1267                 }
1268                 if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1269                         ret = errno;
1270                         break;
1271                 }
1272                 count++;
1273         }
1274         if (ret)
1275                 goto out3;
1276         cp = buf + left - 1;
1277         if(*cp != '\n')
1278                 cp++;
1279         for(;;) {
1280                 while (--cp >= buf) {
1281                         if (*cp == '\n') {
1282                                 if (--nlines == 0) {
1283                                         if (++cp >= buf + sizeof(buf)) {
1284                                                 count++;
1285                                                 cp = buf;
1286                                         }
1287                                         break;
1288                                 }
1289                         }
1290                 }
1291                 if (nlines <= 0 || count == 0)
1292                         break;
1293                 count--;
1294                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1295                         ret = errno;
1296                         break;
1297                 }
1298                 if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1299                         if (ferror(tp)) {
1300                                 ret = errno;
1301                                 break;
1302                         }
1303                         ret = EAGAIN;
1304                         break;
1305                 }
1306                 cp = buf + sizeof(buf);
1307         }
1308
1309         if (ret || nlines > 0)
1310                 goto out3;
1311
1312         if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1313                 ret = errno;
1314                 goto out3;
1315         }
1316
1317         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1318             (off_t)-1) {
1319                 ret = errno;
1320                 goto out3;
1321         }
1322
1323         for(;;) {
1324                 if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1325                         if (ferror(fp))
1326                                 ret = errno;
1327                         break;
1328                 }
1329                 if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1330                         ret = errno;
1331                         break;
1332                 }
1333         }
1334         fflush(fp);
1335         if((off = ftello(fp)) > 0)
1336                 (void)ftruncate(fileno(fp), off);
1337 out3:
1338         fclose(tp);
1339 out2:
1340         unlink(template);
1341 out1:
1342         fclose(fp);
1343
1344         return ret;
1345 }
1346
1347
1348 /*
1349  * read history from a file given
1350  */
1351 int
1352 read_history(const char *filename)
1353 {
1354         HistEvent ev;
1355
1356         if (h == NULL || e == NULL)
1357                 rl_initialize();
1358         if (filename == NULL && (filename = _default_history_file()) == NULL)
1359                 return errno;
1360         errno = 0;
1361         if (history(h, &ev, H_LOAD, filename) == -1)
1362             return errno ? errno : EINVAL;
1363         if (history(h, &ev, H_GETSIZE) == 0)
1364                 history_length = ev.num;
1365         if (history_length < 0)
1366                 return EINVAL;
1367         return 0;
1368 }
1369
1370
1371 /*
1372  * write history to a file given
1373  */
1374 int
1375 write_history(const char *filename)
1376 {
1377         HistEvent ev;
1378
1379         if (h == NULL || e == NULL)
1380                 rl_initialize();
1381         if (filename == NULL && (filename = _default_history_file()) == NULL)
1382                 return errno;
1383         return history(h, &ev, H_SAVE, filename) == -1 ?
1384             (errno ? errno : EINVAL) : 0;
1385 }
1386
1387 int
1388 append_history(int n, const char *filename)
1389 {
1390         HistEvent ev;
1391         FILE *fp;
1392
1393         if (h == NULL || e == NULL)
1394                 rl_initialize();
1395         if (filename == NULL && (filename = _default_history_file()) == NULL)
1396                 return errno;
1397
1398         if ((fp = fopen(filename, "a")) == NULL)
1399                 return errno;
1400
1401         if (history(h, &ev, H_NSAVE_FP, (size_t)n,  fp) == -1) {
1402                 int serrno = errno ? errno : EINVAL;
1403                 fclose(fp);
1404                 return serrno;
1405         }
1406         fclose(fp);
1407         return 0;
1408 }
1409
1410 /*
1411  * returns history ``num''th event
1412  *
1413  * returned pointer points to static variable
1414  */
1415 HIST_ENTRY *
1416 history_get(int num)
1417 {
1418         static HIST_ENTRY she;
1419         HistEvent ev;
1420         int curr_num;
1421
1422         if (h == NULL || e == NULL)
1423                 rl_initialize();
1424
1425         if (num < history_base)
1426                 return NULL;
1427
1428         /* save current position */
1429         if (history(h, &ev, H_CURR) != 0)
1430                 return NULL;
1431         curr_num = ev.num;
1432
1433         /*
1434          * use H_DELDATA to set to nth history (without delete) by passing
1435          * (void **)-1  -- as in history_set_pos
1436          */
1437         if (history(h, &ev, H_DELDATA, num - history_base, (void **)-1) != 0)
1438                 goto out;
1439
1440         /* get current entry */
1441         if (history(h, &ev, H_CURR) != 0)
1442                 goto out;
1443         if (history(h, &ev, H_NEXT_EVDATA, ev.num, &she.data) != 0)
1444                 goto out;
1445         she.line = ev.str;
1446
1447         /* restore pointer to where it was */
1448         (void)history(h, &ev, H_SET, curr_num);
1449
1450         return &she;
1451
1452 out:
1453         /* restore pointer to where it was */
1454         (void)history(h, &ev, H_SET, curr_num);
1455         return NULL;
1456 }
1457
1458
1459 /*
1460  * add the line to history table
1461  */
1462 int
1463 add_history(const char *line)
1464 {
1465         HistEvent ev;
1466
1467         if (h == NULL || e == NULL)
1468                 rl_initialize();
1469
1470         if (history(h, &ev, H_ENTER, line) == -1)
1471                 return 0;
1472
1473         (void)history(h, &ev, H_GETSIZE);
1474         if (ev.num == history_length)
1475                 history_base++;
1476         else {
1477                 history_offset++;
1478                 history_length = ev.num;
1479         }
1480         return 0;
1481 }
1482
1483
1484 /*
1485  * remove the specified entry from the history list and return it.
1486  */
1487 HIST_ENTRY *
1488 remove_history(int num)
1489 {
1490         HIST_ENTRY *he;
1491         HistEvent ev;
1492
1493         if (h == NULL || e == NULL)
1494                 rl_initialize();
1495
1496         if ((he = el_malloc(sizeof(*he))) == NULL)
1497                 return NULL;
1498
1499         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1500                 el_free(he);
1501                 return NULL;
1502         }
1503
1504         he->line = ev.str;
1505         if (history(h, &ev, H_GETSIZE) == 0)
1506                 history_length = ev.num;
1507
1508         return he;
1509 }
1510
1511
1512 /*
1513  * replace the line and data of the num-th entry
1514  */
1515 HIST_ENTRY *
1516 replace_history_entry(int num, const char *line, histdata_t data)
1517 {
1518         HIST_ENTRY *he;
1519         HistEvent ev;
1520         int curr_num;
1521
1522         if (h == NULL || e == NULL)
1523                 rl_initialize();
1524
1525         /* save current position */
1526         if (history(h, &ev, H_CURR) != 0)
1527                 return NULL;
1528         curr_num = ev.num;
1529
1530         /* start from the oldest */
1531         if (history(h, &ev, H_LAST) != 0)
1532                 return NULL;    /* error */
1533
1534         if ((he = el_malloc(sizeof(*he))) == NULL)
1535                 return NULL;
1536
1537         /* look forwards for event matching specified offset */
1538         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1539                 goto out;
1540
1541         he->line = strdup(ev.str);
1542         if (he->line == NULL)
1543                 goto out;
1544
1545         if (history(h, &ev, H_REPLACE, line, data))
1546                 goto out;
1547
1548         /* restore pointer to where it was */
1549         if (history(h, &ev, H_SET, curr_num))
1550                 goto out;
1551
1552         return he;
1553 out:
1554         el_free(he);
1555         return NULL;
1556 }
1557
1558 /*
1559  * clear the history list - delete all entries
1560  */
1561 void
1562 clear_history(void)
1563 {
1564         HistEvent ev;
1565
1566         if (h == NULL || e == NULL)
1567                 rl_initialize();
1568
1569         (void)history(h, &ev, H_CLEAR);
1570         history_offset = history_length = 0;
1571 }
1572
1573
1574 /*
1575  * returns offset of the current history event
1576  */
1577 int
1578 where_history(void)
1579 {
1580         return history_offset;
1581 }
1582
1583 static HIST_ENTRY **_history_listp;
1584 static HIST_ENTRY *_history_list;
1585
1586 HIST_ENTRY **
1587 history_list(void)
1588 {
1589         HistEvent ev;
1590         HIST_ENTRY **nlp, *nl;
1591         int i;
1592
1593         if (history(h, &ev, H_LAST) != 0)
1594                 return NULL;
1595
1596         if ((nlp = el_realloc(_history_listp,
1597             ((size_t)history_length + 1) * sizeof(*nlp))) == NULL)
1598                 return NULL;
1599         _history_listp = nlp;
1600
1601         if ((nl = el_realloc(_history_list,
1602             (size_t)history_length * sizeof(*nl))) == NULL)
1603                 return NULL;
1604         _history_list = nl;
1605
1606         i = 0;
1607         do {
1608                 _history_listp[i] = &_history_list[i];
1609                 _history_list[i].line = ev.str;
1610                 _history_list[i].data = NULL;
1611                 if (i++ == history_length)
1612                         abort();
1613         } while (history(h, &ev, H_PREV) == 0);
1614         _history_listp[i] = NULL;
1615         return _history_listp;
1616 }
1617
1618 /*
1619  * returns current history event or NULL if there is no such event
1620  */
1621 HIST_ENTRY *
1622 current_history(void)
1623 {
1624         HistEvent ev;
1625
1626         if (history(h, &ev, H_PREV_EVENT, history_offset + 1) != 0)
1627                 return NULL;
1628
1629         rl_he.line = ev.str;
1630         rl_he.data = NULL;
1631         return &rl_he;
1632 }
1633
1634
1635 /*
1636  * returns total number of bytes history events' data are using
1637  */
1638 int
1639 history_total_bytes(void)
1640 {
1641         HistEvent ev;
1642         int curr_num;
1643         size_t size;
1644
1645         if (history(h, &ev, H_CURR) != 0)
1646                 return -1;
1647         curr_num = ev.num;
1648
1649         (void)history(h, &ev, H_FIRST);
1650         size = 0;
1651         do
1652                 size += strlen(ev.str) * sizeof(*ev.str);
1653         while (history(h, &ev, H_NEXT) == 0);
1654
1655         /* get to the same position as before */
1656         history(h, &ev, H_PREV_EVENT, curr_num);
1657
1658         return (int)size;
1659 }
1660
1661
1662 /*
1663  * sets the position in the history list to ``pos''
1664  */
1665 int
1666 history_set_pos(int pos)
1667 {
1668         if (pos >= history_length || pos < 0)
1669                 return 0;
1670
1671         history_offset = pos;
1672         return 1;
1673 }
1674
1675
1676 /*
1677  * returns previous event in history and shifts pointer accordingly
1678  * Note that readline and editline define directions in opposite ways.
1679  */
1680 HIST_ENTRY *
1681 previous_history(void)
1682 {
1683         HistEvent ev;
1684
1685         if (history_offset == 0)
1686                 return NULL;
1687
1688         if (history(h, &ev, H_LAST) != 0)
1689                 return NULL;
1690
1691         history_offset--;
1692         return current_history();
1693 }
1694
1695
1696 /*
1697  * returns next event in history and shifts pointer accordingly
1698  */
1699 HIST_ENTRY *
1700 next_history(void)
1701 {
1702         HistEvent ev;
1703
1704         if (history_offset >= history_length)
1705                 return NULL;
1706
1707         if (history(h, &ev, H_LAST) != 0)
1708                 return NULL;
1709
1710         history_offset++;
1711         return current_history();
1712 }
1713
1714
1715 /*
1716  * searches for first history event containing the str
1717  */
1718 int
1719 history_search(const char *str, int direction)
1720 {
1721         HistEvent ev;
1722         const char *strp;
1723         int curr_num;
1724
1725         if (history(h, &ev, H_CURR) != 0)
1726                 return -1;
1727         curr_num = ev.num;
1728
1729         for (;;) {
1730                 if ((strp = strstr(ev.str, str)) != NULL)
1731                         return (int)(strp - ev.str);
1732                 if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1733                         break;
1734         }
1735         (void)history(h, &ev, H_SET, curr_num);
1736         return -1;
1737 }
1738
1739
1740 /*
1741  * searches for first history event beginning with str
1742  */
1743 int
1744 history_search_prefix(const char *str, int direction)
1745 {
1746         HistEvent ev;
1747
1748         return (history(h, &ev, direction < 0 ?
1749             H_PREV_STR : H_NEXT_STR, str));
1750 }
1751
1752
1753 /*
1754  * search for event in history containing str, starting at offset
1755  * abs(pos); continue backward, if pos<0, forward otherwise
1756  */
1757 /* ARGSUSED */
1758 int
1759 history_search_pos(const char *str,
1760                    int direction __attribute__((__unused__)), int pos)
1761 {
1762         HistEvent ev;
1763         int curr_num, off;
1764
1765         off = (pos > 0) ? pos : -pos;
1766         pos = (pos > 0) ? 1 : -1;
1767
1768         if (history(h, &ev, H_CURR) != 0)
1769                 return -1;
1770         curr_num = ev.num;
1771
1772         if (!history_set_pos(off) || history(h, &ev, H_CURR) != 0)
1773                 return -1;
1774
1775         for (;;) {
1776                 if (strstr(ev.str, str))
1777                         return off;
1778                 if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1779                         break;
1780         }
1781
1782         /* set "current" pointer back to previous state */
1783         (void)history(h, &ev,
1784             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1785
1786         return -1;
1787 }
1788
1789
1790 /********************************/
1791 /* completion functions */
1792
1793 char *
1794 tilde_expand(char *name)
1795 {
1796         return fn_tilde_expand(name);
1797 }
1798
1799 char *
1800 filename_completion_function(const char *name, int state)
1801 {
1802         return fn_filename_completion_function(name, state);
1803 }
1804
1805 /*
1806  * a completion generator for usernames; returns _first_ username
1807  * which starts with supplied text
1808  * text contains a partial username preceded by random character
1809  * (usually '~'); state resets search from start (??? should we do that anyway)
1810  * it's the caller's responsibility to free the returned value
1811  */
1812 char *
1813 username_completion_function(const char *text, int state)
1814 {
1815 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1816         struct passwd pwres;
1817         char pwbuf[1024];
1818 #endif
1819         struct passwd *pass = NULL;
1820
1821         if (text[0] == '\0')
1822                 return NULL;
1823
1824         if (*text == '~')
1825                 text++;
1826
1827         if (state == 0)
1828                 setpwent();
1829
1830         while (
1831 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1832             getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pass) == 0 && pass != NULL
1833 #else
1834             (pass = getpwent()) != NULL
1835 #endif
1836             && text[0] == pass->pw_name[0]
1837             && strcmp(text, pass->pw_name) == 0)
1838                 continue;
1839
1840         if (pass == NULL) {
1841                 endpwent();
1842                 return NULL;
1843         }
1844         return strdup(pass->pw_name);
1845 }
1846
1847
1848 /*
1849  * el-compatible wrapper to send TSTP on ^Z
1850  */
1851 /* ARGSUSED */
1852 static unsigned char
1853 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1854 {
1855         (void)kill(0, SIGTSTP);
1856         return CC_NORM;
1857 }
1858
1859 static const char *
1860 /*ARGSUSED*/
1861 _rl_completion_append_character_function(const char *dummy
1862     __attribute__((__unused__)))
1863 {
1864         static char buf[2];
1865         buf[0] = (char)rl_completion_append_character;
1866         buf[1] = '\0';
1867         return buf;
1868 }
1869
1870
1871 /*
1872  * Display list of strings in columnar format on readline's output stream.
1873  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1874  * 'max' is maximum length of string in 'matches'.
1875  */
1876 void
1877 rl_display_match_list(char **matches, int len, int max)
1878 {
1879
1880         fn_display_match_list(e, matches, (size_t)len, (size_t)max,
1881                 _rl_completion_append_character_function);
1882 }
1883
1884 /*
1885  * complete word at current point
1886  */
1887 /* ARGSUSED */
1888 int
1889 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1890 {
1891         static ct_buffer_t wbreak_conv, sprefix_conv;
1892         const char *breakchars;
1893
1894         if (h == NULL || e == NULL)
1895                 rl_initialize();
1896
1897         if (rl_inhibit_completion) {
1898                 char arr[2];
1899                 arr[0] = (char)invoking_key;
1900                 arr[1] = '\0';
1901                 el_insertstr(e, arr);
1902                 return CC_REFRESH;
1903         }
1904
1905         if (rl_completion_word_break_hook != NULL)
1906                 breakchars = (*rl_completion_word_break_hook)();
1907         else
1908                 breakchars = rl_basic_word_break_characters;
1909
1910         _rl_update_pos();
1911
1912         /* Just look at how many global variables modify this operation! */
1913         return fn_complete(e,
1914             (rl_compentry_func_t *)rl_completion_entry_function,
1915             rl_attempted_completion_function,
1916             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1917             ct_decode_string(breakchars, &sprefix_conv),
1918             _rl_completion_append_character_function,
1919             (size_t)rl_completion_query_items,
1920             &rl_completion_type, &rl_attempted_completion_over,
1921             &rl_point, &rl_end);
1922
1923
1924 }
1925
1926
1927 /* ARGSUSED */
1928 static unsigned char
1929 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1930 {
1931         return (unsigned char)rl_complete(0, ch);
1932 }
1933
1934 /*
1935  * misc other functions
1936  */
1937
1938 /*
1939  * bind key c to readline-type function func
1940  */
1941 int
1942 rl_bind_key(int c, rl_command_func_t *func)
1943 {
1944         int retval = -1;
1945
1946         if (h == NULL || e == NULL)
1947                 rl_initialize();
1948
1949         if (func == rl_insert) {
1950                 /* XXX notice there is no range checking of ``c'' */
1951                 e->el_map.key[c] = ED_INSERT;
1952                 retval = 0;
1953         }
1954         return retval;
1955 }
1956
1957
1958 /*
1959  * read one key from input - handles chars pushed back
1960  * to input stream also
1961  */
1962 int
1963 rl_read_key(void)
1964 {
1965         char fooarr[2 * sizeof(int)];
1966
1967         if (e == NULL || h == NULL)
1968                 rl_initialize();
1969
1970         return el_getc(e, fooarr);
1971 }
1972
1973
1974 /*
1975  * reset the terminal
1976  */
1977 /* ARGSUSED */
1978 int
1979 rl_reset_terminal(const char *p __attribute__((__unused__)))
1980 {
1981
1982         if (h == NULL || e == NULL)
1983                 rl_initialize();
1984         el_reset(e);
1985         return 0;
1986 }
1987
1988
1989 /*
1990  * insert character ``c'' back into input stream, ``count'' times
1991  */
1992 int
1993 rl_insert(int count, int c)
1994 {
1995         char arr[2];
1996
1997         if (h == NULL || e == NULL)
1998                 rl_initialize();
1999
2000         /* XXX - int -> char conversion can lose on multichars */
2001         arr[0] = (char)c;
2002         arr[1] = '\0';
2003
2004         for (; count > 0; count--)
2005                 el_push(e, arr);
2006
2007         return 0;
2008 }
2009
2010 int
2011 rl_insert_text(const char *text)
2012 {
2013         if (!text || *text == 0)
2014                 return 0;
2015
2016         if (h == NULL || e == NULL)
2017                 rl_initialize();
2018
2019         if (el_insertstr(e, text) < 0)
2020                 return 0;
2021         return (int)strlen(text);
2022 }
2023
2024 /*ARGSUSED*/
2025 int
2026 rl_newline(int count __attribute__((__unused__)),
2027     int c __attribute__((__unused__)))
2028 {
2029         /*
2030          * Readline-4.0 appears to ignore the args.
2031          */
2032         return rl_insert(1, '\n');
2033 }
2034
2035 /*ARGSUSED*/
2036 static unsigned char
2037 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
2038 {
2039         if (map[c] == NULL)
2040             return CC_ERROR;
2041
2042         _rl_update_pos();
2043
2044         (*map[c])(1, c);
2045
2046         /* If rl_done was set by the above call, deal with it here */
2047         if (rl_done)
2048                 return CC_EOF;
2049
2050         return CC_NORM;
2051 }
2052
2053 int
2054 rl_add_defun(const char *name, rl_command_func_t *fun, int c)
2055 {
2056         char dest[8];
2057         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
2058                 return -1;
2059         map[(unsigned char)c] = fun;
2060         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
2061         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
2062         el_set(e, EL_BIND, dest, name, NULL);
2063         return 0;
2064 }
2065
2066 void
2067 rl_callback_read_char(void)
2068 {
2069         int count = 0, done = 0;
2070         const char *buf = el_gets(e, &count);
2071         char *wbuf;
2072
2073         if (buf == NULL || count-- <= 0)
2074                 return;
2075         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
2076                 done = 1;
2077         if (buf[count] == '\n' || buf[count] == '\r')
2078                 done = 2;
2079
2080         if (done && rl_linefunc != NULL) {
2081                 el_set(e, EL_UNBUFFERED, 0);
2082                 if (done == 2) {
2083                         if ((wbuf = strdup(buf)) != NULL)
2084                                 wbuf[count] = '\0';
2085                 } else
2086                         wbuf = NULL;
2087                 (*(void (*)(const char *))rl_linefunc)(wbuf);
2088                 el_set(e, EL_UNBUFFERED, 1);
2089         }
2090 }
2091
2092 void
2093 rl_callback_handler_install(const char *prompt, rl_vcpfunc_t *linefunc)
2094 {
2095         if (e == NULL) {
2096                 rl_initialize();
2097         }
2098         (void)rl_set_prompt(prompt);
2099         rl_linefunc = linefunc;
2100         el_set(e, EL_UNBUFFERED, 1);
2101 }
2102
2103 void
2104 rl_callback_handler_remove(void)
2105 {
2106         rl_linefunc = NULL;
2107         el_end(e);
2108         e = NULL;
2109 }
2110
2111 void
2112 rl_redisplay(void)
2113 {
2114         char a[2];
2115         a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2116         a[1] = '\0';
2117         el_push(e, a);
2118 }
2119
2120 int
2121 rl_get_previous_history(int count, int key)
2122 {
2123         char a[2];
2124         a[0] = (char)key;
2125         a[1] = '\0';
2126         while (count--)
2127                 el_push(e, a);
2128         return 0;
2129 }
2130
2131 void
2132 /*ARGSUSED*/
2133 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2134 {
2135         el_set(e, EL_PREP_TERM, 1);
2136 }
2137
2138 void
2139 rl_deprep_terminal(void)
2140 {
2141         el_set(e, EL_PREP_TERM, 0);
2142 }
2143
2144 int
2145 rl_read_init_file(const char *s)
2146 {
2147         return el_source(e, s);
2148 }
2149
2150 int
2151 rl_parse_and_bind(const char *line)
2152 {
2153         const char **argv;
2154         int argc;
2155         Tokenizer *tok;
2156
2157         tok = tok_init(NULL);
2158         tok_str(tok, line, &argc, &argv);
2159         argc = el_parse(e, argc, argv);
2160         tok_end(tok);
2161         return argc ? 1 : 0;
2162 }
2163
2164 int
2165 rl_variable_bind(const char *var, const char *value)
2166 {
2167         /*
2168          * The proper return value is undocument, but this is what the
2169          * readline source seems to do.
2170          */
2171         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2172 }
2173
2174 int
2175 rl_stuff_char(int c)
2176 {
2177         char buf[2];
2178
2179         buf[0] = (char)c;
2180         buf[1] = '\0';
2181         el_insertstr(e, buf);
2182         return 1;
2183 }
2184
2185 static int
2186 _rl_event_read_char(EditLine *el, wchar_t *wc)
2187 {
2188         char    ch;
2189         int     n;
2190         ssize_t num_read = 0;
2191
2192         ch = '\0';
2193         *wc = L'\0';
2194         while (rl_event_hook) {
2195
2196                 (*rl_event_hook)();
2197
2198 #if defined(FIONREAD)
2199                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2200                         return -1;
2201                 if (n)
2202                         num_read = read(el->el_infd, &ch, (size_t)1);
2203                 else
2204                         num_read = 0;
2205 #elif defined(F_SETFL) && defined(O_NDELAY)
2206                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2207                         return -1;
2208                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2209                         return -1;
2210                 num_read = read(el->el_infd, &ch, 1);
2211                 if (fcntl(el->el_infd, F_SETFL, n))
2212                         return -1;
2213 #else
2214                 /* not non-blocking, but what you gonna do? */
2215                 num_read = read(el->el_infd, &ch, 1);
2216                 return -1;
2217 #endif
2218
2219                 if (num_read < 0 && errno == EAGAIN)
2220                         continue;
2221                 if (num_read == 0)
2222                         continue;
2223                 break;
2224         }
2225         if (!rl_event_hook)
2226                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2227         *wc = (wchar_t)ch;
2228         return (int)num_read;
2229 }
2230
2231 static void
2232 _rl_update_pos(void)
2233 {
2234         const LineInfo *li = el_line(e);
2235
2236         rl_point = (int)(li->cursor - li->buffer);
2237         rl_end = (int)(li->lastchar - li->buffer);
2238         rl_line_buffer[rl_end] = '\0';
2239 }
2240
2241 void
2242 rl_get_screen_size(int *rows, int *cols)
2243 {
2244         if (rows)
2245                 el_get(e, EL_GETTC, "li", rows);
2246         if (cols)
2247                 el_get(e, EL_GETTC, "co", cols);
2248 }
2249
2250 void
2251 rl_set_screen_size(int rows, int cols)
2252 {
2253         char buf[64];
2254         (void)snprintf(buf, sizeof(buf), "%d", rows);
2255         el_set(e, EL_SETTC, "li", buf, NULL);
2256         (void)snprintf(buf, sizeof(buf), "%d", cols);
2257         el_set(e, EL_SETTC, "co", buf, NULL);
2258 }
2259
2260 char **
2261 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2262 {
2263         size_t len, max, i, j, min;
2264         char **list, *match, *a, *b;
2265
2266         len = 1;
2267         max = 10;
2268         if ((list = el_calloc(max, sizeof(*list))) == NULL)
2269                 return NULL;
2270
2271         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2272                 list[len++] = match;
2273                 if (len == max) {
2274                         char **nl;
2275                         max += 10;
2276                         if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2277                                 goto out;
2278                         list = nl;
2279                 }
2280         }
2281         if (len == 1)
2282                 goto out;
2283         list[len] = NULL;
2284         if (len == 2) {
2285                 if ((list[0] = strdup(list[1])) == NULL)
2286                         goto out;
2287                 return list;
2288         }
2289         qsort(&list[1], len - 1, sizeof(*list),
2290             (int (*)(const void *, const void *)) strcmp);
2291         min = SIZE_MAX;
2292         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2293                 b = list[i + 1];
2294                 for (j = 0; a[j] && a[j] == b[j]; j++)
2295                         continue;
2296                 if (min > j)
2297                         min = j;
2298         }
2299         if (min == 0 && *str) {
2300                 if ((list[0] = strdup(str)) == NULL)
2301                         goto out;
2302         } else {
2303                 if ((list[0] = el_calloc(min + 1, sizeof(*list[0]))) == NULL)
2304                         goto out;
2305                 (void)memcpy(list[0], list[1], min);
2306                 list[0][min] = '\0';
2307         }
2308         return list;
2309
2310 out:
2311         el_free(list);
2312         return NULL;
2313 }
2314
2315 char *
2316 rl_filename_completion_function (const char *text, int state)
2317 {
2318         return fn_filename_completion_function(text, state);
2319 }
2320
2321 void
2322 rl_forced_update_display(void)
2323 {
2324         el_set(e, EL_REFRESH);
2325 }
2326
2327 int
2328 _rl_abort_internal(void)
2329 {
2330         el_beep(e);
2331         longjmp(topbuf, 1);
2332         /*NOTREACHED*/
2333 }
2334
2335 int
2336 _rl_qsort_string_compare(char **s1, char **s2)
2337 {
2338         return strcoll(*s1, *s2);
2339 }
2340
2341 HISTORY_STATE *
2342 history_get_history_state(void)
2343 {
2344         HISTORY_STATE *hs;
2345
2346         if ((hs = el_malloc(sizeof(*hs))) == NULL)
2347                 return NULL;
2348         hs->length = history_length;
2349         return hs;
2350 }
2351
2352 int
2353 /*ARGSUSED*/
2354 rl_kill_text(int from __attribute__((__unused__)),
2355     int to __attribute__((__unused__)))
2356 {
2357         return 0;
2358 }
2359
2360 Keymap
2361 rl_make_bare_keymap(void)
2362 {
2363         return NULL;
2364 }
2365
2366 Keymap
2367 rl_get_keymap(void)
2368 {
2369         return NULL;
2370 }
2371
2372 void
2373 /*ARGSUSED*/
2374 rl_set_keymap(Keymap k __attribute__((__unused__)))
2375 {
2376 }
2377
2378 int
2379 /*ARGSUSED*/
2380 rl_generic_bind(int type __attribute__((__unused__)),
2381     const char * keyseq __attribute__((__unused__)),
2382     const char * data __attribute__((__unused__)),
2383     Keymap k __attribute__((__unused__)))
2384 {
2385         return 0;
2386 }
2387
2388 int
2389 /*ARGSUSED*/
2390 rl_bind_key_in_map(int key __attribute__((__unused__)),
2391     rl_command_func_t *fun __attribute__((__unused__)),
2392     Keymap k __attribute__((__unused__)))
2393 {
2394         return 0;
2395 }
2396
2397 /* unsupported, but needed by python */
2398 void
2399 rl_cleanup_after_signal(void)
2400 {
2401 }
2402
2403 int
2404 rl_on_new_line(void)
2405 {
2406         return 0;
2407 }
2408
2409 void
2410 rl_free_line_state(void)
2411 {
2412 }
2413
2414 int
2415 /*ARGSUSED*/
2416 rl_set_keyboard_input_timeout(int u __attribute__((__unused__)))
2417 {
2418         return 0;
2419 }
2420
2421 void
2422 rl_resize_terminal(void)
2423 {
2424         el_resize(e);
2425 }
2426
2427 void
2428 rl_reset_after_signal(void)
2429 {
2430         if (rl_prep_term_function)
2431                 (*rl_prep_term_function)();
2432 }
2433
2434 void
2435 rl_echo_signal_char(int sig)
2436 {
2437         int c = tty_get_signal_character(e, sig);
2438         if (c == -1)
2439                 return;
2440         re_putc(e, c, 0);
2441 }