contrib/libedit/readline.c

   1 /*      $NetBSD: readline.c,v 1.157 2019/08/21 11:11:48 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 1.157 2019/08/21 11:11:48 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                         (void)strncpy(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)strncpy(pat, cmd + begin, len);
 611                 pat[len] = '\0';
 612         }
 613
 614         if (history(h, &ev, H_CURR) != 0) {
 615                 if (pat != last_search_pat)
 616                         el_free(pat);
 617                 return NULL;
 618         }
 619         num = ev.num;
 620
 621         if (sub) {
 622                 if (pat != last_search_pat) {
 623                         if (last_search_pat)
 624                                 el_free(last_search_pat);
 625                         last_search_pat = pat;
 626                 }
 627                 ret = history_search(pat, -1);
 628         } else
 629                 ret = history_search_prefix(pat, -1);
 630
 631         if (ret == -1) {
 632                 /* restore to end of list on failed search */
 633                 history(h, &ev, H_FIRST);
 634                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 635                 if (pat != last_search_pat)
 636                         el_free(pat);
 637                 return NULL;
 638         }
 639
 640         if (sub && len) {
 641                 if (last_search_match && last_search_match != pat)
 642                         el_free(last_search_match);
 643                 last_search_match = pat;
 644         }
 645
 646         if (pat != last_search_pat)
 647                 el_free(pat);
 648
 649         if (history(h, &ev, H_CURR) != 0)
 650                 return NULL;
 651         *cindex = idx;
 652         rptr = ev.str;
 653
 654         /* roll back to original position */
 655         (void)history(h, &ev, H_SET, num);
 656
 657         return rptr;
 658 }
 659
 660 /*
 661  * the real function doing history expansion - takes as argument command
 662  * to do and data upon which the command should be executed
 663  * does expansion the way I've understood readline documentation
 664  *
 665  * returns 0 if data was not modified, 1 if it was and 2 if the string
 666  * should be only printed and not executed; in case of error,
 667  * returns -1 and *result points to NULL
 668  * it's the caller's responsibility to free() the string returned in *result
 669  */
 670 static int
 671 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 672     char **result)
 673 {
 674         char *tmp, *search = NULL, *aptr;
 675         const char *ptr, *cmd;
 676         static char *from = NULL, *to = NULL;
 677         int start, end, idx, has_mods = 0;
 678         int p_on = 0, g_on = 0;
 679
 680         *result = NULL;
 681         aptr = NULL;
 682         ptr = NULL;
 683
 684         /* First get event specifier */
 685         idx = 0;
 686
 687         if (strchr(":^*$", command[offs + 1])) {
 688                 char str[4];
 689                 /*
 690                 * "!:" is shorthand for "!!:".
 691                 * "!^", "!*" and "!$" are shorthand for
 692                 * "!!:^", "!!:*" and "!!:$" respectively.
 693                 */
 694                 str[0] = str[1] = '!';
 695                 str[2] = '0';
 696                 ptr = get_history_event(str, &idx, 0);
 697                 idx = (command[offs + 1] == ':')? 1:0;
 698                 has_mods = 1;
 699         } else {
 700                 if (command[offs + 1] == '#') {
 701                         /* use command so far */
 702                         if ((aptr = el_calloc(offs + 1, sizeof(*aptr)))
 703                             == NULL)
 704                                 return -1;
 705                         (void)strncpy(aptr, command, offs);
 706                         aptr[offs] = '\0';
 707                         idx = 1;
 708                 } else {
 709                         int     qchar;
 710
 711                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 712                         ptr = get_history_event(command + offs, &idx, qchar);
 713                 }
 714                 has_mods = command[offs + (size_t)idx] == ':';
 715         }
 716
 717         if (ptr == NULL && aptr == NULL)
 718                 return -1;
 719
 720         if (!has_mods) {
 721                 *result = strdup(aptr ? aptr : ptr);
 722                 if (aptr)
 723                         el_free(aptr);
 724                 if (*result == NULL)
 725                         return -1;
 726                 return 1;
 727         }
 728
 729         cmd = command + offs + idx + 1;
 730
 731         /* Now parse any word designators */
 732
 733         if (*cmd == '%')        /* last word matched by ?pat? */
 734                 tmp = strdup(last_search_match? last_search_match:"");
 735         else if (strchr("^*$-0123456789", *cmd)) {
 736                 start = end = -1;
 737                 if (*cmd == '^')
 738                         start = end = 1, cmd++;
 739                 else if (*cmd == '$')
 740                         start = -1, cmd++;
 741                 else if (*cmd == '*')
 742                         start = 1, cmd++;
 743                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 744                         start = 0;
 745                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 746                                 start = start * 10 + *cmd++ - '0';
 747
 748                         if (*cmd == '-') {
 749                                 if (isdigit((unsigned char) cmd[1])) {
 750                                         cmd++;
 751                                         end = 0;
 752                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 753                                                 end = end * 10 + *cmd++ - '0';
 754                                 } else if (cmd[1] == '$') {
 755                                         cmd += 2;
 756                                         end = -1;
 757                                 } else {
 758                                         cmd++;
 759                                         end = -2;
 760                                 }
 761                         } else if (*cmd == '*')
 762                                 end = -1, cmd++;
 763                         else
 764                                 end = start;
 765                 }
 766                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 767                 if (tmp == NULL) {
 768                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 769                             command + offs + idx);
 770                         if (aptr)
 771                                 el_free(aptr);
 772                         return -1;
 773                 }
 774         } else
 775                 tmp = strdup(aptr? aptr:ptr);
 776
 777         if (aptr)
 778                 el_free(aptr);
 779
 780         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 781                 *result = tmp;
 782                 return 1;
 783         }
 784
 785         for (; *cmd; cmd++) {
 786                 if (*cmd == ':')
 787                         continue;
 788                 else if (*cmd == 'h') {         /* remove trailing path */
 789                         if ((aptr = strrchr(tmp, '/')) != NULL)
 790                                 *aptr = '\0';
 791                 } else if (*cmd == 't') {       /* remove leading path */
 792                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 793                                 aptr = strdup(aptr + 1);
 794                                 el_free(tmp);
 795                                 tmp = aptr;
 796                         }
 797                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 798                         if ((aptr = strrchr(tmp, '.')) != NULL)
 799                                 *aptr = '\0';
 800                 } else if (*cmd == 'e') {       /* remove all but suffix */
 801                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 802                                 aptr = strdup(aptr);
 803                                 el_free(tmp);
 804                                 tmp = aptr;
 805                         }
 806                 } else if (*cmd == 'p')         /* print only */
 807                         p_on = 1;
 808                 else if (*cmd == 'g')
 809                         g_on = 2;
 810                 else if (*cmd == 's' || *cmd == '&') {
 811                         char *what, *with, delim;
 812                         size_t len, from_len;
 813                         size_t size;
 814
 815                         if (*cmd == '&' && (from == NULL || to == NULL))
 816                                 continue;
 817                         else if (*cmd == 's') {
 818                                 delim = *(++cmd), cmd++;
 819                                 size = 16;
 820                                 what = el_realloc(from, size * sizeof(*what));
 821                                 if (what == NULL) {
 822                                         el_free(from);
 823                                         el_free(tmp);
 824                                         return 0;
 825                                 }
 826                                 len = 0;
 827                                 for (; *cmd && *cmd != delim; cmd++) {
 828                                         if (*cmd == '\\' && cmd[1] == delim)
 829                                                 cmd++;
 830                                         if (len >= size) {
 831                                                 char *nwhat;
 832                                                 nwhat = el_realloc(what,
 833                                                     (size <<= 1) *
 834                                                     sizeof(*nwhat));
 835                                                 if (nwhat == NULL) {
 836                                                         el_free(what);
 837                                                         el_free(tmp);
 838                                                         return 0;
 839                                                 }
 840                                                 what = nwhat;
 841                                         }
 842                                         what[len++] = *cmd;
 843                                 }
 844                                 what[len] = '\0';
 845                                 from = what;
 846                                 if (*what == '\0') {
 847                                         el_free(what);
 848                                         if (search) {
 849                                                 from = strdup(search);
 850                                                 if (from == NULL) {
 851                                                         el_free(tmp);
 852                                                         return 0;
 853                                                 }
 854                                         } else {
 855                                                 from = NULL;
 856                                                 el_free(tmp);
 857                                                 return -1;
 858                                         }
 859                                 }
 860                                 cmd++;  /* shift after delim */
 861                                 if (!*cmd)
 862                                         continue;
 863
 864                                 size = 16;
 865                                 with = el_realloc(to, size * sizeof(*with));
 866                                 if (with == NULL) {
 867                                         el_free(to);
 868                                         el_free(tmp);
 869                                         return -1;
 870                                 }
 871                                 len = 0;
 872                                 from_len = strlen(from);
 873                                 for (; *cmd && *cmd != delim; cmd++) {
 874                                         if (len + from_len + 1 >= size) {
 875                                                 char *nwith;
 876                                                 size += from_len + 1;
 877                                                 nwith = el_realloc(with,
 878                                                     size * sizeof(*nwith));
 879                                                 if (nwith == NULL) {
 880                                                         el_free(with);
 881                                                         el_free(tmp);
 882                                                         return -1;
 883                                                 }
 884                                                 with = nwith;
 885                                         }
 886                                         if (*cmd == '&') {
 887                                                 /* safe */
 888                                                 (void)strcpy(&with[len], from);
 889                                                 len += from_len;
 890                                                 continue;
 891                                         }
 892                                         if (*cmd == '\\'
 893                                             && (*(cmd + 1) == delim
 894                                                 || *(cmd + 1) == '&'))
 895                                                 cmd++;
 896                                         with[len++] = *cmd;
 897                                 }
 898                                 with[len] = '\0';
 899                                 to = with;
 900                         }
 901
 902                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 903                         if (aptr) {
 904                                 el_free(tmp);
 905                                 tmp = aptr;
 906                         }
 907                         g_on = 0;
 908                 }
 909         }
 910         *result = tmp;
 911         return p_on? 2:1;
 912 }
 913
 914
 915 /*
 916  * csh-style history expansion
 917  */
 918 int
 919 history_expand(char *str, char **output)
 920 {
 921         int ret = 0;
 922         size_t idx, i, size;
 923         char *tmp, *result;
 924
 925         if (h == NULL || e == NULL)
 926                 rl_initialize();
 927
 928         if (history_expansion_char == 0) {
 929                 *output = strdup(str);
 930                 return 0;
 931         }
 932
 933         *output = NULL;
 934         if (str[0] == history_subst_char) {
 935                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 936                 *output = el_calloc(strlen(str) + 4 + 1, sizeof(**output));
 937                 if (*output == NULL)
 938                         return 0;
 939                 (*output)[0] = (*output)[1] = history_expansion_char;
 940                 (*output)[2] = ':';
 941                 (*output)[3] = 's';
 942                 (void)strcpy((*output) + 4, str);
 943                 str = *output;
 944         } else {
 945                 *output = strdup(str);
 946                 if (*output == NULL)
 947                         return 0;
 948         }
 949
 950 #define ADD_STRING(what, len, fr)                                       \
 951         {                                                               \
 952                 if (idx + len + 1 > size) {                             \
 953                         char *nresult = el_realloc(result,              \
 954                             (size += len + 1) * sizeof(*nresult));      \
 955                         if (nresult == NULL) {                          \
 956                                 el_free(*output);                       \
 957                                 if (/*CONSTCOND*/fr)                    \
 958                                         el_free(tmp);                   \
 959                                 return 0;                               \
 960                         }                                               \
 961                         result = nresult;                               \
 962                 }                                                       \
 963                 (void)strncpy(&result[idx], what, len);                 \
 964                 idx += len;                                             \
 965                 result[idx] = '\0';                                     \
 966         }
 967
 968         result = NULL;
 969         size = idx = 0;
 970         tmp = NULL;
 971         for (i = 0; str[i];) {
 972                 int qchar, loop_again;
 973                 size_t len, start, j;
 974
 975                 qchar = 0;
 976                 loop_again = 1;
 977                 start = j = i;
 978 loop:
 979                 for (; str[j]; j++) {
 980                         if (str[j] == '\\' &&
 981                             str[j + 1] == history_expansion_char) {
 982                                 len = strlen(&str[j + 1]) + 1;
 983                                 memmove(&str[j], &str[j + 1], len);
 984                                 continue;
 985                         }
 986                         if (!loop_again) {
 987                                 if (isspace((unsigned char) str[j])
 988                                     || str[j] == qchar)
 989                                         break;
 990                         }
 991                         if (str[j] == history_expansion_char
 992                             && !strchr(history_no_expand_chars, str[j + 1])
 993                             && (!history_inhibit_expansion_function ||
 994                             (*history_inhibit_expansion_function)(str,
 995                             (int)j) == 0))
 996                                 break;
 997                 }
 998
 999                 if (str[j] && loop_again) {
1000                         i = j;
1001                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
1002                         j++;
1003                         if (str[j] == history_expansion_char)
1004                                 j++;
1005                         loop_again = 0;
1006                         goto loop;
1007                 }
1008                 len = i - start;
1009                 ADD_STRING(&str[start], len, 0);
1010
1011                 if (str[i] == '\0' || str[i] != history_expansion_char) {
1012                         len = j - i;
1013                         ADD_STRING(&str[i], len, 0);
1014                         if (start == 0)
1015                                 ret = 0;
1016                         else
1017                                 ret = 1;
1018                         break;
1019                 }
1020                 ret = _history_expand_command (str, i, (j - i), &tmp);
1021                 if (ret > 0 && tmp) {
1022                         len = strlen(tmp);
1023                         ADD_STRING(tmp, len, 1);
1024                 }
1025                 if (tmp) {
1026                         el_free(tmp);
1027                         tmp = NULL;
1028                 }
1029                 i = j;
1030         }
1031
1032         /* ret is 2 for "print only" option */
1033         if (ret == 2) {
1034                 add_history(result);
1035 #ifdef GDB_411_HACK
1036                 /* gdb 4.11 has been shipped with readline, where */
1037                 /* history_expand() returned -1 when the line     */
1038                 /* should not be executed; in readline 2.1+       */
1039                 /* it should return 2 in such a case              */
1040                 ret = -1;
1041 #endif
1042         }
1043         el_free(*output);
1044         *output = result;
1045
1046         return ret;
1047 }
1048
1049 /*
1050 * Return a string consisting of arguments of "str" from "start" to "end".
1051 */
1052 char *
1053 history_arg_extract(int start, int end, const char *str)
1054 {
1055         size_t  i, len, max;
1056         char    **arr, *result = NULL;
1057
1058         arr = history_tokenize(str);
1059         if (!arr)
1060                 return NULL;
1061         if (arr && *arr == NULL)
1062                 goto out;
1063
1064         for (max = 0; arr[max]; max++)
1065                 continue;
1066         max--;
1067
1068         if (start == '$')
1069                 start = (int)max;
1070         if (end == '$')
1071                 end = (int)max;
1072         if (end < 0)
1073                 end = (int)max + end + 1;
1074         if (start < 0)
1075                 start = end;
1076
1077         if (start < 0 || end < 0 || (size_t)start > max ||
1078             (size_t)end > max || start > end)
1079                 goto out;
1080
1081         for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1082                 len += strlen(arr[i]) + 1;
1083         len++;
1084         result = el_calloc(len, sizeof(*result));
1085         if (result == NULL)
1086                 goto out;
1087
1088         for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1089                 (void)strcpy(result + len, arr[i]);
1090                 len += strlen(arr[i]);
1091                 if (i < (size_t)end)
1092                         result[len++] = ' ';
1093         }
1094         result[len] = '\0';
1095
1096 out:
1097         for (i = 0; arr[i]; i++)
1098                 el_free(arr[i]);
1099         el_free(arr);
1100
1101         return result;
1102 }
1103
1104 /*
1105  * Parse the string into individual tokens,
1106  * similar to how shell would do it.
1107  */
1108 char **
1109 history_tokenize(const char *str)
1110 {
1111         int size = 1, idx = 0, i, start;
1112         size_t len;
1113         char **result = NULL, *temp, delim = '\0';
1114
1115         for (i = 0; str[i];) {
1116                 while (isspace((unsigned char) str[i]))
1117                         i++;
1118                 start = i;
1119                 for (; str[i];) {
1120                         if (str[i] == '\\') {
1121                                 if (str[i+1] != '\0')
1122                                         i++;
1123                         } else if (str[i] == delim)
1124                                 delim = '\0';
1125                         else if (!delim &&
1126                                     (isspace((unsigned char) str[i]) ||
1127                                 strchr("()<>;&|$", str[i])))
1128                                 break;
1129                         else if (!delim && strchr("'`\"", str[i]))
1130                                 delim = str[i];
1131                         if (str[i])
1132                                 i++;
1133                 }
1134
1135                 if (idx + 2 >= size) {
1136                         char **nresult;
1137                         size <<= 1;
1138                         nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1139                         if (nresult == NULL) {
1140                                 el_free(result);
1141                                 return NULL;
1142                         }
1143                         result = nresult;
1144                 }
1145                 len = (size_t)i - (size_t)start;
1146                 temp = el_calloc(len + 1, sizeof(*temp));
1147                 if (temp == NULL) {
1148                         for (i = 0; i < idx; i++)
1149                                 el_free(result[i]);
1150                         el_free(result);
1151                         return NULL;
1152                 }
1153                 (void)strncpy(temp, &str[start], len);
1154                 temp[len] = '\0';
1155                 result[idx++] = temp;
1156                 result[idx] = NULL;
1157                 if (str[i])
1158                         i++;
1159         }
1160         return result;
1161 }
1162
1163
1164 /*
1165  * limit size of history record to ``max'' events
1166  */
1167 void
1168 stifle_history(int max)
1169 {
1170         HistEvent ev;
1171         HIST_ENTRY *he;
1172
1173         if (h == NULL || e == NULL)
1174                 rl_initialize();
1175
1176         if (history(h, &ev, H_SETSIZE, max) == 0) {
1177                 max_input_history = max;
1178                 if (history_length > max)
1179                         history_base = history_length - max;
1180                 while (history_length > max) {
1181                         he = remove_history(0);
1182                         el_free(he->data);
1183                         el_free((void *)(unsigned long)he->line);
1184                         el_free(he);
1185                 }
1186         }
1187 }
1188
1189
1190 /*
1191  * "unlimit" size of history - set the limit to maximum allowed int value
1192  */
1193 int
1194 unstifle_history(void)
1195 {
1196         HistEvent ev;
1197         int omax;
1198
1199         history(h, &ev, H_SETSIZE, INT_MAX);
1200         omax = max_input_history;
1201         max_input_history = INT_MAX;
1202         return omax;            /* some value _must_ be returned */
1203 }
1204
1205
1206 int
1207 history_is_stifled(void)
1208 {
1209
1210         /* cannot return true answer */
1211         return max_input_history != INT_MAX;
1212 }
1213
1214 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1215
1216 int
1217 history_truncate_file (const char *filename, int nlines)
1218 {
1219         int ret = 0;
1220         FILE *fp, *tp;
1221         char template[sizeof(_history_tmp_template)];
1222         char buf[4096];
1223         int fd;
1224         char *cp;
1225         off_t off;
1226         int count = 0;
1227         ssize_t left = 0;
1228
1229         if (filename == NULL && (filename = _default_history_file()) == NULL)
1230                 return errno;
1231         if ((fp = fopen(filename, "r+")) == NULL)
1232                 return errno;
1233         strcpy(template, _history_tmp_template);
1234         if ((fd = mkstemp(template)) == -1) {
1235                 ret = errno;
1236                 goto out1;
1237         }
1238
1239         if ((tp = fdopen(fd, "r+")) == NULL) {
1240                 close(fd);
1241                 ret = errno;
1242                 goto out2;
1243         }
1244
1245         for(;;) {
1246                 if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1247                         if (ferror(fp)) {
1248                                 ret = errno;
1249                                 break;
1250                         }
1251                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1252                             (off_t)-1) {
1253                                 ret = errno;
1254                                 break;
1255                         }
1256                         left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1257                         if (ferror(fp)) {
1258                                 ret = errno;
1259                                 break;
1260                         }
1261                         if (left == 0) {
1262                                 count--;
1263                                 left = sizeof(buf);
1264                         } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1265                             != 1) {
1266                                 ret = errno;
1267                                 break;
1268                         }
1269                         fflush(tp);
1270                         break;
1271                 }
1272                 if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1273                         ret = errno;
1274                         break;
1275                 }
1276                 count++;
1277         }
1278         if (ret)
1279                 goto out3;
1280         cp = buf + left - 1;
1281         if(*cp != '\n')
1282                 cp++;
1283         for(;;) {
1284                 while (--cp >= buf) {
1285                         if (*cp == '\n') {
1286                                 if (--nlines == 0) {
1287                                         if (++cp >= buf + sizeof(buf)) {
1288                                                 count++;
1289                                                 cp = buf;
1290                                         }
1291                                         break;
1292                                 }
1293                         }
1294                 }
1295                 if (nlines <= 0 || count == 0)
1296                         break;
1297                 count--;
1298                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1299                         ret = errno;
1300                         break;
1301                 }
1302                 if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1303                         if (ferror(tp)) {
1304                                 ret = errno;
1305                                 break;
1306                         }
1307                         ret = EAGAIN;
1308                         break;
1309                 }
1310                 cp = buf + sizeof(buf);
1311         }
1312
1313         if (ret || nlines > 0)
1314                 goto out3;
1315
1316         if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1317                 ret = errno;
1318                 goto out3;
1319         }
1320
1321         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1322             (off_t)-1) {
1323                 ret = errno;
1324                 goto out3;
1325         }
1326
1327         for(;;) {
1328                 if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1329                         if (ferror(fp))
1330                                 ret = errno;
1331                         break;
1332                 }
1333                 if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1334                         ret = errno;
1335                         break;
1336                 }
1337         }
1338         fflush(fp);
1339         if((off = ftello(fp)) > 0)
1340                 (void)ftruncate(fileno(fp), off);
1341 out3:
1342         fclose(tp);
1343 out2:
1344         unlink(template);
1345 out1:
1346         fclose(fp);
1347
1348         return ret;
1349 }
1350
1351
1352 /*
1353  * read history from a file given
1354  */
1355 int
1356 read_history(const char *filename)
1357 {
1358         HistEvent ev;
1359
1360         if (h == NULL || e == NULL)
1361                 rl_initialize();
1362         if (filename == NULL && (filename = _default_history_file()) == NULL)
1363                 return errno;
1364         errno = 0;
1365         if (history(h, &ev, H_LOAD, filename) == -1)
1366             return errno ? errno : EINVAL;
1367         if (history(h, &ev, H_GETSIZE) == 0)
1368                 history_length = ev.num;
1369         if (history_length < 0)
1370                 return EINVAL;
1371         return 0;
1372 }
1373
1374
1375 /*
1376  * write history to a file given
1377  */
1378 int
1379 write_history(const char *filename)
1380 {
1381         HistEvent ev;
1382
1383         if (h == NULL || e == NULL)
1384                 rl_initialize();
1385         if (filename == NULL && (filename = _default_history_file()) == NULL)
1386                 return errno;
1387         return history(h, &ev, H_SAVE, filename) == -1 ?
1388             (errno ? errno : EINVAL) : 0;
1389 }
1390
1391 int
1392 append_history(int n, const char *filename)
1393 {
1394         HistEvent ev;
1395         FILE *fp;
1396
1397         if (h == NULL || e == NULL)
1398                 rl_initialize();
1399         if (filename == NULL && (filename = _default_history_file()) == NULL)
1400                 return errno;
1401
1402         if ((fp = fopen(filename, "a")) == NULL)
1403                 return errno;
1404
1405         if (history(h, &ev, H_NSAVE_FP, (size_t)n,  fp) == -1) {
1406                 int serrno = errno ? errno : EINVAL;
1407                 fclose(fp);
1408                 return serrno;
1409         }
1410         fclose(fp);
1411         return 0;
1412 }
1413
1414 /*
1415  * returns history ``num''th event
1416  *
1417  * returned pointer points to static variable
1418  */
1419 HIST_ENTRY *
1420 history_get(int num)
1421 {
1422         static HIST_ENTRY she;
1423         HistEvent ev;
1424         int curr_num;
1425
1426         if (h == NULL || e == NULL)
1427                 rl_initialize();
1428
1429         if (num < history_base)
1430                 return NULL;
1431
1432         /* save current position */
1433         if (history(h, &ev, H_CURR) != 0)
1434                 return NULL;
1435         curr_num = ev.num;
1436
1437         /*
1438          * use H_DELDATA to set to nth history (without delete) by passing
1439          * (void **)-1  -- as in history_set_pos
1440          */
1441         if (history(h, &ev, H_DELDATA, num - history_base, (void **)-1) != 0)
1442                 goto out;
1443
1444         /* get current entry */
1445         if (history(h, &ev, H_CURR) != 0)
1446                 goto out;
1447         if (history(h, &ev, H_NEXT_EVDATA, ev.num, &she.data) != 0)
1448                 goto out;
1449         she.line = ev.str;
1450
1451         /* restore pointer to where it was */
1452         (void)history(h, &ev, H_SET, curr_num);
1453
1454         return &she;
1455
1456 out:
1457         /* restore pointer to where it was */
1458         (void)history(h, &ev, H_SET, curr_num);
1459         return NULL;
1460 }
1461
1462
1463 /*
1464  * add the line to history table
1465  */
1466 int
1467 add_history(const char *line)
1468 {
1469         HistEvent ev;
1470
1471         if (h == NULL || e == NULL)
1472                 rl_initialize();
1473
1474         if (history(h, &ev, H_ENTER, line) == -1)
1475                 return 0;
1476
1477         (void)history(h, &ev, H_GETSIZE);
1478         if (ev.num == history_length)
1479                 history_base++;
1480         else {
1481                 history_offset++;
1482                 history_length = ev.num;
1483         }
1484         return 0;
1485 }
1486
1487
1488 /*
1489  * remove the specified entry from the history list and return it.
1490  */
1491 HIST_ENTRY *
1492 remove_history(int num)
1493 {
1494         HIST_ENTRY *he;
1495         HistEvent ev;
1496
1497         if (h == NULL || e == NULL)
1498                 rl_initialize();
1499
1500         if ((he = el_malloc(sizeof(*he))) == NULL)
1501                 return NULL;
1502
1503         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1504                 el_free(he);
1505                 return NULL;
1506         }
1507
1508         he->line = ev.str;
1509         if (history(h, &ev, H_GETSIZE) == 0)
1510                 history_length = ev.num;
1511
1512         return he;
1513 }
1514
1515
1516 /*
1517  * replace the line and data of the num-th entry
1518  */
1519 HIST_ENTRY *
1520 replace_history_entry(int num, const char *line, histdata_t data)
1521 {
1522         HIST_ENTRY *he;
1523         HistEvent ev;
1524         int curr_num;
1525
1526         if (h == NULL || e == NULL)
1527                 rl_initialize();
1528
1529         /* save current position */
1530         if (history(h, &ev, H_CURR) != 0)
1531                 return NULL;
1532         curr_num = ev.num;
1533
1534         /* start from the oldest */
1535         if (history(h, &ev, H_LAST) != 0)
1536                 return NULL;    /* error */
1537
1538         if ((he = el_malloc(sizeof(*he))) == NULL)
1539                 return NULL;
1540
1541         /* look forwards for event matching specified offset */
1542         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1543                 goto out;
1544
1545         he->line = strdup(ev.str);
1546         if (he->line == NULL)
1547                 goto out;
1548
1549         if (history(h, &ev, H_REPLACE, line, data))
1550                 goto out;
1551
1552         /* restore pointer to where it was */
1553         if (history(h, &ev, H_SET, curr_num))
1554                 goto out;
1555
1556         return he;
1557 out:
1558         el_free(he);
1559         return NULL;
1560 }
1561
1562 /*
1563  * clear the history list - delete all entries
1564  */
1565 void
1566 clear_history(void)
1567 {
1568         HistEvent ev;
1569
1570         if (h == NULL || e == NULL)
1571                 rl_initialize();
1572
1573         (void)history(h, &ev, H_CLEAR);
1574         history_offset = history_length = 0;
1575 }
1576
1577
1578 /*
1579  * returns offset of the current history event
1580  */
1581 int
1582 where_history(void)
1583 {
1584         return history_offset;
1585 }
1586
1587 static HIST_ENTRY **_history_listp;
1588 static HIST_ENTRY *_history_list;
1589
1590 HIST_ENTRY **
1591 history_list(void)
1592 {
1593         HistEvent ev;
1594         HIST_ENTRY **nlp, *nl;
1595         int i;
1596
1597         if (history(h, &ev, H_LAST) != 0)
1598                 return NULL;
1599
1600         if ((nlp = el_realloc(_history_listp,
1601             ((size_t)history_length + 1) * sizeof(*nlp))) == NULL)
1602                 return NULL;
1603         _history_listp = nlp;
1604
1605         if ((nl = el_realloc(_history_list,
1606             (size_t)history_length * sizeof(*nl))) == NULL)
1607                 return NULL;
1608         _history_list = nl;
1609
1610         i = 0;
1611         do {
1612                 _history_listp[i] = &_history_list[i];
1613                 _history_list[i].line = ev.str;
1614                 _history_list[i].data = NULL;
1615                 if (i++ == history_length)
1616                         abort();
1617         } while (history(h, &ev, H_PREV) == 0);
1618         _history_listp[i] = NULL;
1619         return _history_listp;
1620 }
1621
1622 /*
1623  * returns current history event or NULL if there is no such event
1624  */
1625 HIST_ENTRY *
1626 current_history(void)
1627 {
1628         HistEvent ev;
1629
1630         if (history(h, &ev, H_PREV_EVENT, history_offset + 1) != 0)
1631                 return NULL;
1632
1633         rl_he.line = ev.str;
1634         rl_he.data = NULL;
1635         return &rl_he;
1636 }
1637
1638
1639 /*
1640  * returns total number of bytes history events' data are using
1641  */
1642 int
1643 history_total_bytes(void)
1644 {
1645         HistEvent ev;
1646         int curr_num;
1647         size_t size;
1648
1649         if (history(h, &ev, H_CURR) != 0)
1650                 return -1;
1651         curr_num = ev.num;
1652
1653         (void)history(h, &ev, H_FIRST);
1654         size = 0;
1655         do
1656                 size += strlen(ev.str) * sizeof(*ev.str);
1657         while (history(h, &ev, H_NEXT) == 0);
1658
1659         /* get to the same position as before */
1660         history(h, &ev, H_PREV_EVENT, curr_num);
1661
1662         return (int)size;
1663 }
1664
1665
1666 /*
1667  * sets the position in the history list to ``pos''
1668  */
1669 int
1670 history_set_pos(int pos)
1671 {
1672         if (pos >= history_length || pos < 0)
1673                 return 0;
1674
1675         history_offset = pos;
1676         return 1;
1677 }
1678
1679
1680 /*
1681  * returns previous event in history and shifts pointer accordingly
1682  * Note that readline and editline define directions in opposite ways.
1683  */
1684 HIST_ENTRY *
1685 previous_history(void)
1686 {
1687         HistEvent ev;
1688
1689         if (history_offset == 0)
1690                 return NULL;
1691
1692         if (history(h, &ev, H_LAST) != 0)
1693                 return NULL;
1694
1695         history_offset--;
1696         return current_history();
1697 }
1698
1699
1700 /*
1701  * returns next event in history and shifts pointer accordingly
1702  */
1703 HIST_ENTRY *
1704 next_history(void)
1705 {
1706         HistEvent ev;
1707
1708         if (history_offset >= history_length)
1709                 return NULL;
1710
1711         if (history(h, &ev, H_LAST) != 0)
1712                 return NULL;
1713
1714         history_offset++;
1715         return current_history();
1716 }
1717
1718
1719 /*
1720  * searches for first history event containing the str
1721  */
1722 int
1723 history_search(const char *str, int direction)
1724 {
1725         HistEvent ev;
1726         const char *strp;
1727         int curr_num;
1728
1729         if (history(h, &ev, H_CURR) != 0)
1730                 return -1;
1731         curr_num = ev.num;
1732
1733         for (;;) {
1734                 if ((strp = strstr(ev.str, str)) != NULL)
1735                         return (int)(strp - ev.str);
1736                 if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1737                         break;
1738         }
1739         (void)history(h, &ev, H_SET, curr_num);
1740         return -1;
1741 }
1742
1743
1744 /*
1745  * searches for first history event beginning with str
1746  */
1747 int
1748 history_search_prefix(const char *str, int direction)
1749 {
1750         HistEvent ev;
1751
1752         return (history(h, &ev, direction < 0 ?
1753             H_PREV_STR : H_NEXT_STR, str));
1754 }
1755
1756
1757 /*
1758  * search for event in history containing str, starting at offset
1759  * abs(pos); continue backward, if pos<0, forward otherwise
1760  */
1761 /* ARGSUSED */
1762 int
1763 history_search_pos(const char *str,
1764                    int direction __attribute__((__unused__)), int pos)
1765 {
1766         HistEvent ev;
1767         int curr_num, off;
1768
1769         off = (pos > 0) ? pos : -pos;
1770         pos = (pos > 0) ? 1 : -1;
1771
1772         if (history(h, &ev, H_CURR) != 0)
1773                 return -1;
1774         curr_num = ev.num;
1775
1776         if (!history_set_pos(off) || history(h, &ev, H_CURR) != 0)
1777                 return -1;
1778
1779         for (;;) {
1780                 if (strstr(ev.str, str))
1781                         return off;
1782                 if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1783                         break;
1784         }
1785
1786         /* set "current" pointer back to previous state */
1787         (void)history(h, &ev,
1788             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1789
1790         return -1;
1791 }
1792
1793
1794 /********************************/
1795 /* completion functions */
1796
1797 char *
1798 tilde_expand(char *name)
1799 {
1800         return fn_tilde_expand(name);
1801 }
1802
1803 char *
1804 filename_completion_function(const char *name, int state)
1805 {
1806         return fn_filename_completion_function(name, state);
1807 }
1808
1809 /*
1810  * a completion generator for usernames; returns _first_ username
1811  * which starts with supplied text
1812  * text contains a partial username preceded by random character
1813  * (usually '~'); state resets search from start (??? should we do that anyway)
1814  * it's the caller's responsibility to free the returned value
1815  */
1816 char *
1817 username_completion_function(const char *text, int state)
1818 {
1819 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1820         struct passwd pwres;
1821         char pwbuf[1024];
1822 #endif
1823         struct passwd *pass = NULL;
1824
1825         if (text[0] == '\0')
1826                 return NULL;
1827
1828         if (*text == '~')
1829                 text++;
1830
1831         if (state == 0)
1832                 setpwent();
1833
1834         while (
1835 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1836             getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pass) == 0 && pass != NULL
1837 #else
1838             (pass = getpwent()) != NULL
1839 #endif
1840             && text[0] == pass->pw_name[0]
1841             && strcmp(text, pass->pw_name) == 0)
1842                 continue;
1843
1844         if (pass == NULL) {
1845                 endpwent();
1846                 return NULL;
1847         }
1848         return strdup(pass->pw_name);
1849 }
1850
1851
1852 /*
1853  * el-compatible wrapper to send TSTP on ^Z
1854  */
1855 /* ARGSUSED */
1856 static unsigned char
1857 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1858 {
1859         (void)kill(0, SIGTSTP);
1860         return CC_NORM;
1861 }
1862
1863 static const char *
1864 /*ARGSUSED*/
1865 _rl_completion_append_character_function(const char *dummy
1866     __attribute__((__unused__)))
1867 {
1868         static char buf[2];
1869         buf[0] = (char)rl_completion_append_character;
1870         buf[1] = '\0';
1871         return buf;
1872 }
1873
1874
1875 /*
1876  * Display list of strings in columnar format on readline's output stream.
1877  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1878  * 'max' is maximum length of string in 'matches'.
1879  */
1880 void
1881 rl_display_match_list(char **matches, int len, int max)
1882 {
1883
1884         fn_display_match_list(e, matches, (size_t)len, (size_t)max,
1885                 _rl_completion_append_character_function);
1886 }
1887
1888 /*
1889  * complete word at current point
1890  */
1891 /* ARGSUSED */
1892 int
1893 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1894 {
1895         static ct_buffer_t wbreak_conv, sprefix_conv;
1896         const char *breakchars;
1897
1898         if (h == NULL || e == NULL)
1899                 rl_initialize();
1900
1901         if (rl_inhibit_completion) {
1902                 char arr[2];
1903                 arr[0] = (char)invoking_key;
1904                 arr[1] = '\0';
1905                 el_insertstr(e, arr);
1906                 return CC_REFRESH;
1907         }
1908
1909         if (rl_completion_word_break_hook != NULL)
1910                 breakchars = (*rl_completion_word_break_hook)();
1911         else
1912                 breakchars = rl_basic_word_break_characters;
1913
1914         _rl_update_pos();
1915
1916         /* Just look at how many global variables modify this operation! */
1917         return fn_complete(e,
1918             (rl_compentry_func_t *)rl_completion_entry_function,
1919             rl_attempted_completion_function,
1920             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1921             ct_decode_string(breakchars, &sprefix_conv),
1922             _rl_completion_append_character_function,
1923             (size_t)rl_completion_query_items,
1924             &rl_completion_type, &rl_attempted_completion_over,
1925             &rl_point, &rl_end);
1926
1927
1928 }
1929
1930
1931 /* ARGSUSED */
1932 static unsigned char
1933 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1934 {
1935         return (unsigned char)rl_complete(0, ch);
1936 }
1937
1938 /*
1939  * misc other functions
1940  */
1941
1942 /*
1943  * bind key c to readline-type function func
1944  */
1945 int
1946 rl_bind_key(int c, rl_command_func_t *func)
1947 {
1948         int retval = -1;
1949
1950         if (h == NULL || e == NULL)
1951                 rl_initialize();
1952
1953         if (func == rl_insert) {
1954                 /* XXX notice there is no range checking of ``c'' */
1955                 e->el_map.key[c] = ED_INSERT;
1956                 retval = 0;
1957         }
1958         return retval;
1959 }
1960
1961
1962 /*
1963  * read one key from input - handles chars pushed back
1964  * to input stream also
1965  */
1966 int
1967 rl_read_key(void)
1968 {
1969         char fooarr[2 * sizeof(int)];
1970
1971         if (e == NULL || h == NULL)
1972                 rl_initialize();
1973
1974         return el_getc(e, fooarr);
1975 }
1976
1977
1978 /*
1979  * reset the terminal
1980  */
1981 /* ARGSUSED */
1982 int
1983 rl_reset_terminal(const char *p __attribute__((__unused__)))
1984 {
1985
1986         if (h == NULL || e == NULL)
1987                 rl_initialize();
1988         el_reset(e);
1989         return 0;
1990 }
1991
1992
1993 /*
1994  * insert character ``c'' back into input stream, ``count'' times
1995  */
1996 int
1997 rl_insert(int count, int c)
1998 {
1999         char arr[2];
2000
2001         if (h == NULL || e == NULL)
2002                 rl_initialize();
2003
2004         /* XXX - int -> char conversion can lose on multichars */
2005         arr[0] = (char)c;
2006         arr[1] = '\0';
2007
2008         for (; count > 0; count--)
2009                 el_push(e, arr);
2010
2011         return 0;
2012 }
2013
2014 int
2015 rl_insert_text(const char *text)
2016 {
2017         if (!text || *text == 0)
2018                 return 0;
2019
2020         if (h == NULL || e == NULL)
2021                 rl_initialize();
2022
2023         if (el_insertstr(e, text) < 0)
2024                 return 0;
2025         return (int)strlen(text);
2026 }
2027
2028 /*ARGSUSED*/
2029 int
2030 rl_newline(int count __attribute__((__unused__)),
2031     int c __attribute__((__unused__)))
2032 {
2033         /*
2034          * Readline-4.0 appears to ignore the args.
2035          */
2036         return rl_insert(1, '\n');
2037 }
2038
2039 /*ARGSUSED*/
2040 static unsigned char
2041 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
2042 {
2043         if (map[c] == NULL)
2044             return CC_ERROR;
2045
2046         _rl_update_pos();
2047
2048         (*map[c])(1, c);
2049
2050         /* If rl_done was set by the above call, deal with it here */
2051         if (rl_done)
2052                 return CC_EOF;
2053
2054         return CC_NORM;
2055 }
2056
2057 int
2058 rl_add_defun(const char *name, rl_command_func_t *fun, int c)
2059 {
2060         char dest[8];
2061         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
2062                 return -1;
2063         map[(unsigned char)c] = fun;
2064         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
2065         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
2066         el_set(e, EL_BIND, dest, name, NULL);
2067         return 0;
2068 }
2069
2070 void
2071 rl_callback_read_char(void)
2072 {
2073         int count = 0, done = 0;
2074         const char *buf = el_gets(e, &count);
2075         char *wbuf;
2076
2077         if (buf == NULL || count-- <= 0)
2078                 return;
2079         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
2080                 done = 1;
2081         if (buf[count] == '\n' || buf[count] == '\r')
2082                 done = 2;
2083
2084         if (done && rl_linefunc != NULL) {
2085                 el_set(e, EL_UNBUFFERED, 0);
2086                 if (done == 2) {
2087                         if ((wbuf = strdup(buf)) != NULL)
2088                                 wbuf[count] = '\0';
2089                 } else
2090                         wbuf = NULL;
2091                 (*(void (*)(const char *))rl_linefunc)(wbuf);
2092                 el_set(e, EL_UNBUFFERED, 1);
2093         }
2094 }
2095
2096 void
2097 rl_callback_handler_install(const char *prompt, rl_vcpfunc_t *linefunc)
2098 {
2099         if (e == NULL) {
2100                 rl_initialize();
2101         }
2102         (void)rl_set_prompt(prompt);
2103         rl_linefunc = linefunc;
2104         el_set(e, EL_UNBUFFERED, 1);
2105 }
2106
2107 void
2108 rl_callback_handler_remove(void)
2109 {
2110         rl_linefunc = NULL;
2111         el_end(e);
2112         e = NULL;
2113 }
2114
2115 void
2116 rl_redisplay(void)
2117 {
2118         char a[2];
2119         a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2120         a[1] = '\0';
2121         el_push(e, a);
2122 }
2123
2124 int
2125 rl_get_previous_history(int count, int key)
2126 {
2127         char a[2];
2128         a[0] = (char)key;
2129         a[1] = '\0';
2130         while (count--)
2131                 el_push(e, a);
2132         return 0;
2133 }
2134
2135 void
2136 /*ARGSUSED*/
2137 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2138 {
2139         el_set(e, EL_PREP_TERM, 1);
2140 }
2141
2142 void
2143 rl_deprep_terminal(void)
2144 {
2145         el_set(e, EL_PREP_TERM, 0);
2146 }
2147
2148 int
2149 rl_read_init_file(const char *s)
2150 {
2151         return el_source(e, s);
2152 }
2153
2154 int
2155 rl_parse_and_bind(const char *line)
2156 {
2157         const char **argv;
2158         int argc;
2159         Tokenizer *tok;
2160
2161         tok = tok_init(NULL);
2162         tok_str(tok, line, &argc, &argv);
2163         argc = el_parse(e, argc, argv);
2164         tok_end(tok);
2165         return argc ? 1 : 0;
2166 }
2167
2168 int
2169 rl_variable_bind(const char *var, const char *value)
2170 {
2171         /*
2172          * The proper return value is undocument, but this is what the
2173          * readline source seems to do.
2174          */
2175         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2176 }
2177
2178 int
2179 rl_stuff_char(int c)
2180 {
2181         char buf[2];
2182
2183         buf[0] = (char)c;
2184         buf[1] = '\0';
2185         el_insertstr(e, buf);
2186         return 1;
2187 }
2188
2189 static int
2190 _rl_event_read_char(EditLine *el, wchar_t *wc)
2191 {
2192         char    ch;
2193         int     n;
2194         ssize_t num_read = 0;
2195
2196         ch = '\0';
2197         *wc = L'\0';
2198         while (rl_event_hook) {
2199
2200                 (*rl_event_hook)();
2201
2202 #if defined(FIONREAD)
2203                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2204                         return -1;
2205                 if (n)
2206                         num_read = read(el->el_infd, &ch, (size_t)1);
2207                 else
2208                         num_read = 0;
2209 #elif defined(F_SETFL) && defined(O_NDELAY)
2210                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2211                         return -1;
2212                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2213                         return -1;
2214                 num_read = read(el->el_infd, &ch, 1);
2215                 if (fcntl(el->el_infd, F_SETFL, n))
2216                         return -1;
2217 #else
2218                 /* not non-blocking, but what you gonna do? */
2219                 num_read = read(el->el_infd, &ch, 1);
2220                 return -1;
2221 #endif
2222
2223                 if (num_read < 0 && errno == EAGAIN)
2224                         continue;
2225                 if (num_read == 0)
2226                         continue;
2227                 break;
2228         }
2229         if (!rl_event_hook)
2230                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2231         *wc = (wchar_t)ch;
2232         return (int)num_read;
2233 }
2234
2235 static void
2236 _rl_update_pos(void)
2237 {
2238         const LineInfo *li = el_line(e);
2239
2240         rl_point = (int)(li->cursor - li->buffer);
2241         rl_end = (int)(li->lastchar - li->buffer);
2242         rl_line_buffer[rl_end] = '\0';
2243 }
2244
2245 void
2246 rl_get_screen_size(int *rows, int *cols)
2247 {
2248         if (rows)
2249                 el_get(e, EL_GETTC, "li", rows);
2250         if (cols)
2251                 el_get(e, EL_GETTC, "co", cols);
2252 }
2253
2254 void
2255 rl_set_screen_size(int rows, int cols)
2256 {
2257         char buf[64];
2258         (void)snprintf(buf, sizeof(buf), "%d", rows);
2259         el_set(e, EL_SETTC, "li", buf, NULL);
2260         (void)snprintf(buf, sizeof(buf), "%d", cols);
2261         el_set(e, EL_SETTC, "co", buf, NULL);
2262 }
2263
2264 char **
2265 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2266 {
2267         size_t len, max, i, j, min;
2268         char **list, *match, *a, *b;
2269
2270         len = 1;
2271         max = 10;
2272         if ((list = el_calloc(max, sizeof(*list))) == NULL)
2273                 return NULL;
2274
2275         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2276                 list[len++] = match;
2277                 if (len == max) {
2278                         char **nl;
2279                         max += 10;
2280                         if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2281                                 goto out;
2282                         list = nl;
2283                 }
2284         }
2285         if (len == 1)
2286                 goto out;
2287         list[len] = NULL;
2288         if (len == 2) {
2289                 if ((list[0] = strdup(list[1])) == NULL)
2290                         goto out;
2291                 return list;
2292         }
2293         qsort(&list[1], len - 1, sizeof(*list),
2294             (int (*)(const void *, const void *)) strcmp);
2295         min = SIZE_MAX;
2296         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2297                 b = list[i + 1];
2298                 for (j = 0; a[j] && a[j] == b[j]; j++)
2299                         continue;
2300                 if (min > j)
2301                         min = j;
2302         }
2303         if (min == 0 && *str) {
2304                 if ((list[0] = strdup(str)) == NULL)
2305                         goto out;
2306         } else {
2307                 if ((list[0] = el_calloc(min + 1, sizeof(*list[0]))) == NULL)
2308                         goto out;
2309                 (void)memcpy(list[0], list[1], min);
2310                 list[0][min] = '\0';
2311         }
2312         return list;
2313
2314 out:
2315         el_free(list);
2316         return NULL;
2317 }
2318
2319 char *
2320 rl_filename_completion_function (const char *text, int state)
2321 {
2322         return fn_filename_completion_function(text, state);
2323 }
2324
2325 void
2326 rl_forced_update_display(void)
2327 {
2328         el_set(e, EL_REFRESH);
2329 }
2330
2331 int
2332 _rl_abort_internal(void)
2333 {
2334         el_beep(e);
2335         longjmp(topbuf, 1);
2336         /*NOTREACHED*/
2337 }
2338
2339 int
2340 _rl_qsort_string_compare(char **s1, char **s2)
2341 {
2342         return strcoll(*s1, *s2);
2343 }
2344
2345 HISTORY_STATE *
2346 history_get_history_state(void)
2347 {
2348         HISTORY_STATE *hs;
2349
2350         if ((hs = el_malloc(sizeof(*hs))) == NULL)
2351                 return NULL;
2352         hs->length = history_length;
2353         return hs;
2354 }
2355
2356 int
2357 /*ARGSUSED*/
2358 rl_kill_text(int from __attribute__((__unused__)),
2359     int to __attribute__((__unused__)))
2360 {
2361         return 0;
2362 }
2363
2364 Keymap
2365 rl_make_bare_keymap(void)
2366 {
2367         return NULL;
2368 }
2369
2370 Keymap
2371 rl_get_keymap(void)
2372 {
2373         return NULL;
2374 }
2375
2376 void
2377 /*ARGSUSED*/
2378 rl_set_keymap(Keymap k __attribute__((__unused__)))
2379 {
2380 }
2381
2382 int
2383 /*ARGSUSED*/
2384 rl_generic_bind(int type __attribute__((__unused__)),
2385     const char * keyseq __attribute__((__unused__)),
2386     const char * data __attribute__((__unused__)),
2387     Keymap k __attribute__((__unused__)))
2388 {
2389         return 0;
2390 }
2391
2392 int
2393 /*ARGSUSED*/
2394 rl_bind_key_in_map(int key __attribute__((__unused__)),
2395     rl_command_func_t *fun __attribute__((__unused__)),
2396     Keymap k __attribute__((__unused__)))
2397 {
2398         return 0;
2399 }
2400
2401 /* unsupported, but needed by python */
2402 void
2403 rl_cleanup_after_signal(void)
2404 {
2405 }
2406
2407 int
2408 rl_on_new_line(void)
2409 {
2410         return 0;
2411 }
2412
2413 void
2414 rl_free_line_state(void)
2415 {
2416 }
2417
2418 int
2419 /*ARGSUSED*/
2420 rl_set_keyboard_input_timeout(int u __attribute__((__unused__)))
2421 {
2422         return 0;
2423 }
2424
2425 void
2426 rl_resize_terminal(void)
2427 {
2428         el_resize(e);
2429 }
2430
2431 void
2432 rl_reset_after_signal(void)
2433 {
2434         if (rl_prep_term_function)
2435                 (*rl_prep_term_function)();
2436 }
2437
2438 void
2439 rl_echo_signal_char(int sig)
2440 {
2441         int c = tty_get_signal_character(e, sig);
2442         if (c == -1)
2443                 return;
2444         re_putc(e, c, 0);
2445 }