lib/libedit/readline.c

   1 /*      $NetBSD: readline.c,v 1.126 2016/02/24 17:13:22 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 1.126 2016/02/24 17:13:22 christos Exp $");
  35 #endif /* not lint && not SCCSID */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <ctype.h>
  42 #include <dirent.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <limits.h>
  46 #include <pwd.h>
  47 #include <setjmp.h>
  48 #include <stdint.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <vis.h>
  54
  55 #include "readline/readline.h"
  56 #include "el.h"
  57 #include "filecomplete.h"
  58
  59 void rl_prep_terminal(int);
  60 void rl_deprep_terminal(void);
  61
  62 /* for rl_complete() */
  63 #define TAB             '\r'
  64
  65 /* see comment at the #ifdef for sense of this */
  66 /* #define GDB_411_HACK */
  67
  68 /* readline compatibility stuff - look at readline sources/documentation */
  69 /* to see what these variables mean */
  70 const char *rl_library_version = "EditLine wrapper";
  71 int rl_readline_version = RL_READLINE_VERSION;
  72 static char empty[] = { '\0' };
  73 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  74 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  75     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  76 char *rl_readline_name = empty;
  77 FILE *rl_instream = NULL;
  78 FILE *rl_outstream = NULL;
  79 int rl_point = 0;
  80 int rl_end = 0;
  81 char *rl_line_buffer = NULL;
  82 rl_vcpfunc_t *rl_linefunc = NULL;
  83 int rl_done = 0;
  84 VFunction *rl_event_hook = NULL;
  85 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  86     emacs_meta_keymap,
  87     emacs_ctlx_keymap;
  88 /*
  89  * The following is not implemented; we always catch signals in the
  90  * libedit fashion: set handlers on entry to el_gets() and clear them
  91  * on the way out. This simplistic approach works for most cases; if
  92  * it does not work for your application, please let us know.
  93  */
  94 int rl_catch_signals = 1;
  95 int rl_catch_sigwinch = 1;
  96
  97 int history_base = 1;           /* probably never subject to change */
  98 int history_length = 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 char *rl_basic_word_break_characters = break_chars;
 109 char *rl_completer_word_break_characters = NULL;
 110 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 VFunction *rl_completion_display_matches_hook = NULL;
 126 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 127 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 128 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 129
 130 /*
 131  * The current prompt string.
 132  */
 133 char *rl_prompt = NULL;
 134 /*
 135  * This is set to character indicating type of completion being done by
 136  * rl_complete_internal(); this is available for application completion
 137  * functions.
 138  */
 139 int rl_completion_type = 0;
 140
 141 /*
 142  * If more than this number of items results from query for possible
 143  * completions, we ask user if they are sure to really display the list.
 144  */
 145 int rl_completion_query_items = 100;
 146
 147 /*
 148  * List of characters which are word break characters, but should be left
 149  * in the parsed text when it is passed to the completion function.
 150  * Shell uses this to help determine what kind of completing to do.
 151  */
 152 char *rl_special_prefixes = NULL;
 153
 154 /*
 155  * This is the character appended to the completed words if at the end of
 156  * the line. Default is ' ' (a space).
 157  */
 158 int rl_completion_append_character = ' ';
 159
 160 /* stuff below is used internally by libedit for readline emulation */
 161
 162 static History *h = NULL;
 163 static EditLine *e = NULL;
 164 static rl_command_func_t *map[256];
 165 static jmp_buf topbuf;
 166
 167 /* internal functions */
 168 static unsigned char     _el_rl_complete(EditLine *, int);
 169 static unsigned char     _el_rl_tstp(EditLine *, int);
 170 static char             *_get_prompt(EditLine *);
 171 static int               _getc_function(EditLine *, wchar_t *);
 172 static HIST_ENTRY       *_move_history(int);
 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
 181 /* ARGSUSED */
 182 static char *
 183 _get_prompt(EditLine *el __attribute__((__unused__)))
 184 {
 185         rl_already_prompted = 1;
 186         return rl_prompt;
 187 }
 188
 189
 190 /*
 191  * generic function for moving around history
 192  */
 193 static HIST_ENTRY *
 194 _move_history(int op)
 195 {
 196         HistEvent ev;
 197         static HIST_ENTRY rl_he;
 198
 199         if (history(h, &ev, op) != 0)
 200                 return NULL;
 201
 202         rl_he.line = ev.str;
 203         rl_he.data = NULL;
 204
 205         return &rl_he;
 206 }
 207
 208
 209 /*
 210  * read one key from user defined input function
 211  */
 212 static int
 213 /*ARGSUSED*/
 214 _getc_function(EditLine *el __attribute__((__unused__)), wchar_t *c)
 215 {
 216         int i;
 217
 218         i = (*rl_getc_function)(NULL);
 219         if (i == -1)
 220                 return 0;
 221         *c = (wchar_t)i;
 222         return 1;
 223 }
 224
 225 static void
 226 _resize_fun(EditLine *el, void *a)
 227 {
 228         const LineInfo *li;
 229         char **ap = a;
 230
 231         li = el_line(el);
 232         /* a cheesy way to get rid of const cast. */
 233         *ap = memchr(li->buffer, *li->buffer, (size_t)1);
 234 }
 235
 236 static const char *
 237 _default_history_file(void)
 238 {
 239         struct passwd *p;
 240         static char *path;
 241         size_t len;
 242
 243         if (path)
 244                 return path;
 245
 246         if ((p = getpwuid(getuid())) == NULL)
 247                 return NULL;
 248
 249         len = strlen(p->pw_dir) + sizeof("/.history");
 250         if ((path = malloc(len)) == NULL)
 251                 return NULL;
 252
 253         (void)snprintf(path, len, "%s/.history", p->pw_dir);
 254         return path;
 255 }
 256
 257 /*
 258  * READLINE compatibility stuff
 259  */
 260
 261 /*
 262  * Set the prompt
 263  */
 264 int
 265 rl_set_prompt(const char *prompt)
 266 {
 267         char *p;
 268
 269         if (!prompt)
 270                 prompt = "";
 271         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 272                 return 0;
 273         if (rl_prompt)
 274                 el_free(rl_prompt);
 275         rl_prompt = strdup(prompt);
 276         if (rl_prompt == NULL)
 277                 return -1;
 278
 279         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 280                 *p = RL_PROMPT_START_IGNORE;
 281
 282         return 0;
 283 }
 284
 285 /*
 286  * initialize rl compat stuff
 287  */
 288 int
 289 rl_initialize(void)
 290 {
 291         HistEvent ev;
 292         int editmode = 1;
 293         struct termios t;
 294
 295         if (e != NULL)
 296                 el_end(e);
 297         if (h != NULL)
 298                 history_end(h);
 299
 300         if (!rl_instream)
 301                 rl_instream = stdin;
 302         if (!rl_outstream)
 303                 rl_outstream = stdout;
 304
 305         /*
 306          * See if we don't really want to run the editor
 307          */
 308         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 309                 editmode = 0;
 310
 311         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 312
 313         if (!editmode)
 314                 el_set(e, EL_EDITMODE, 0);
 315
 316         h = history_init();
 317         if (!e || !h)
 318                 return -1;
 319
 320         history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
 321         history_length = 0;
 322         max_input_history = INT_MAX;
 323         el_set(e, EL_HIST, history, h);
 324
 325         /* Setup resize function */
 326         el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
 327
 328         /* setup getc function if valid */
 329         if (rl_getc_function)
 330                 el_set(e, EL_GETCFN, _getc_function);
 331
 332         /* for proper prompt printing in readline() */
 333         if (rl_set_prompt("") == -1) {
 334                 history_end(h);
 335                 el_end(e);
 336                 return -1;
 337         }
 338         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 339         el_set(e, EL_SIGNAL, rl_catch_signals);
 340
 341         /* set default mode to "emacs"-style and read setting afterwards */
 342         /* so this can be overridden */
 343         el_set(e, EL_EDITOR, "emacs");
 344         if (rl_terminal_name != NULL)
 345                 el_set(e, EL_TERMINAL, rl_terminal_name);
 346         else
 347                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 348
 349         /*
 350          * Word completion - this has to go AFTER rebinding keys
 351          * to emacs-style.
 352          */
 353         el_set(e, EL_ADDFN, "rl_complete",
 354             "ReadLine compatible completion function",
 355             _el_rl_complete);
 356         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 357
 358         /*
 359          * Send TSTP when ^Z is pressed.
 360          */
 361         el_set(e, EL_ADDFN, "rl_tstp",
 362             "ReadLine compatible suspend function",
 363             _el_rl_tstp);
 364         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 365
 366         /*
 367          * Set some readline compatible key-bindings.
 368          */
 369         el_set(e, EL_BIND, "^R", "em-inc-search-prev", NULL);
 370
 371         /*
 372          * Allow the use of Home/End keys.
 373          */
 374         el_set(e, EL_BIND, "\\e[1~", "ed-move-to-beg", NULL);
 375         el_set(e, EL_BIND, "\\e[4~", "ed-move-to-end", NULL);
 376         el_set(e, EL_BIND, "\\e[7~", "ed-move-to-beg", NULL);
 377         el_set(e, EL_BIND, "\\e[8~", "ed-move-to-end", NULL);
 378         el_set(e, EL_BIND, "\\e[H", "ed-move-to-beg", NULL);
 379         el_set(e, EL_BIND, "\\e[F", "ed-move-to-end", NULL);
 380
 381         /*
 382          * Allow the use of the Delete/Insert keys.
 383          */
 384         el_set(e, EL_BIND, "\\e[3~", "ed-delete-next-char", NULL);
 385         el_set(e, EL_BIND, "\\e[2~", "ed-quoted-insert", NULL);
 386
 387         /*
 388          * Ctrl-left-arrow and Ctrl-right-arrow for word moving.
 389          */
 390         el_set(e, EL_BIND, "\\e[1;5C", "em-next-word", NULL);
 391         el_set(e, EL_BIND, "\\e[1;5D", "ed-prev-word", NULL);
 392         el_set(e, EL_BIND, "\\e[5C", "em-next-word", NULL);
 393         el_set(e, EL_BIND, "\\e[5D", "ed-prev-word", NULL);
 394         el_set(e, EL_BIND, "\\e\\e[C", "em-next-word", NULL);
 395         el_set(e, EL_BIND, "\\e\\e[D", "ed-prev-word", NULL);
 396
 397         /* read settings from configuration file */
 398         el_source(e, NULL);
 399
 400         /*
 401          * Unfortunately, some applications really do use rl_point
 402          * and rl_line_buffer directly.
 403          */
 404         _resize_fun(e, &rl_line_buffer);
 405         _rl_update_pos();
 406
 407         if (rl_startup_hook)
 408                 (*rl_startup_hook)(NULL, 0);
 409
 410         return 0;
 411 }
 412
 413
 414 /*
 415  * read one line from input stream and return it, chomping
 416  * trailing newline (if there is any)
 417  */
 418 char *
 419 readline(const char *p)
 420 {
 421         HistEvent ev;
 422         const char * volatile prompt = p;
 423         int count;
 424         const char *ret;
 425         char *buf;
 426         static int used_event_hook;
 427
 428         if (e == NULL || h == NULL)
 429                 rl_initialize();
 430
 431         rl_done = 0;
 432
 433         (void)setjmp(topbuf);
 434
 435         /* update prompt accordingly to what has been passed */
 436         if (rl_set_prompt(prompt) == -1)
 437                 return NULL;
 438
 439         if (rl_pre_input_hook)
 440                 (*rl_pre_input_hook)(NULL, 0);
 441
 442         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 443                 el_set(e, EL_GETCFN, _rl_event_read_char);
 444                 used_event_hook = 1;
 445         }
 446
 447         if (!rl_event_hook && used_event_hook) {
 448                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 449                 used_event_hook = 0;
 450         }
 451
 452         rl_already_prompted = 0;
 453
 454         /* get one line from input stream */
 455         ret = el_gets(e, &count);
 456
 457         if (ret && count > 0) {
 458                 int lastidx;
 459
 460                 buf = strdup(ret);
 461                 if (buf == NULL)
 462                         return NULL;
 463                 lastidx = count - 1;
 464                 if (buf[lastidx] == '\n')
 465                         buf[lastidx] = '\0';
 466         } else
 467                 buf = NULL;
 468
 469         history(h, &ev, H_GETSIZE);
 470         history_length = ev.num;
 471
 472         return buf;
 473 }
 474
 475 /*
 476  * history functions
 477  */
 478
 479 /*
 480  * is normally called before application starts to use
 481  * history expansion functions
 482  */
 483 void
 484 using_history(void)
 485 {
 486         if (h == NULL || e == NULL)
 487                 rl_initialize();
 488 }
 489
 490
 491 /*
 492  * substitute ``what'' with ``with'', returning resulting string; if
 493  * globally == 1, substitutes all occurrences of what, otherwise only the
 494  * first one
 495  */
 496 static char *
 497 _rl_compat_sub(const char *str, const char *what, const char *with,
 498     int globally)
 499 {
 500         const   char    *s;
 501         char    *r, *result;
 502         size_t  len, with_len, what_len;
 503
 504         len = strlen(str);
 505         with_len = strlen(with);
 506         what_len = strlen(what);
 507
 508         /* calculate length we need for result */
 509         s = str;
 510         while (*s) {
 511                 if (*s == *what && !strncmp(s, what, what_len)) {
 512                         len += with_len - what_len;
 513                         if (!globally)
 514                                 break;
 515                         s += what_len;
 516                 } else
 517                         s++;
 518         }
 519         r = result = el_malloc((len + 1) * sizeof(*r));
 520         if (result == NULL)
 521                 return NULL;
 522         s = str;
 523         while (*s) {
 524                 if (*s == *what && !strncmp(s, what, what_len)) {
 525                         (void)strncpy(r, with, with_len);
 526                         r += with_len;
 527                         s += what_len;
 528                         if (!globally) {
 529                                 (void)strcpy(r, s);
 530                                 return result;
 531                         }
 532                 } else
 533                         *r++ = *s++;
 534         }
 535         *r = '\0';
 536         return result;
 537 }
 538
 539 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 540 static  char    *last_search_match;     /* last !?pat[?] that matched */
 541
 542 const char *
 543 get_history_event(const char *cmd, int *cindex, int qchar)
 544 {
 545         int idx, sign, sub, num, begin, ret;
 546         size_t len;
 547         char    *pat;
 548         const char *rptr;
 549         HistEvent ev;
 550
 551         idx = *cindex;
 552         if (cmd[idx++] != history_expansion_char)
 553                 return NULL;
 554
 555         /* find out which event to take */
 556         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 557                 if (history(h, &ev, H_FIRST) != 0)
 558                         return NULL;
 559                 *cindex = cmd[idx]? (idx + 1):idx;
 560                 return ev.str;
 561         }
 562         sign = 0;
 563         if (cmd[idx] == '-') {
 564                 sign = 1;
 565                 idx++;
 566         }
 567
 568         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 569                 HIST_ENTRY *rl_he;
 570
 571                 num = 0;
 572                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 573                         num = num * 10 + cmd[idx] - '0';
 574                         idx++;
 575                 }
 576                 if (sign)
 577                         num = history_length - num + 1;
 578
 579                 if (!(rl_he = history_get(num)))
 580                         return NULL;
 581
 582                 *cindex = idx;
 583                 return rl_he->line;
 584         }
 585         sub = 0;
 586         if (cmd[idx] == '?') {
 587                 sub = 1;
 588                 idx++;
 589         }
 590         begin = idx;
 591         while (cmd[idx]) {
 592                 if (cmd[idx] == '\n')
 593                         break;
 594                 if (sub && cmd[idx] == '?')
 595                         break;
 596                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 597                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 598                         break;
 599                 idx++;
 600         }
 601         len = (size_t)idx - (size_t)begin;
 602         if (sub && cmd[idx] == '?')
 603                 idx++;
 604         if (sub && len == 0 && last_search_pat && *last_search_pat)
 605                 pat = last_search_pat;
 606         else if (len == 0)
 607                 return NULL;
 608         else {
 609                 if ((pat = el_malloc((len + 1) * sizeof(*pat))) == NULL)
 610                         return NULL;
 611                 (void)strncpy(pat, cmd + begin, len);
 612                 pat[len] = '\0';
 613         }
 614
 615         if (history(h, &ev, H_CURR) != 0) {
 616                 if (pat != last_search_pat)
 617                         el_free(pat);
 618                 return NULL;
 619         }
 620         num = ev.num;
 621
 622         if (sub) {
 623                 if (pat != last_search_pat) {
 624                         if (last_search_pat)
 625                                 el_free(last_search_pat);
 626                         last_search_pat = pat;
 627                 }
 628                 ret = history_search(pat, -1);
 629         } else
 630                 ret = history_search_prefix(pat, -1);
 631
 632         if (ret == -1) {
 633                 /* restore to end of list on failed search */
 634                 history(h, &ev, H_FIRST);
 635                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 636                 if (pat != last_search_pat)
 637                         el_free(pat);
 638                 return NULL;
 639         }
 640
 641         if (sub && len) {
 642                 if (last_search_match && last_search_match != pat)
 643                         el_free(last_search_match);
 644                 last_search_match = pat;
 645         }
 646
 647         if (pat != last_search_pat)
 648                 el_free(pat);
 649
 650         if (history(h, &ev, H_CURR) != 0)
 651                 return NULL;
 652         *cindex = idx;
 653         rptr = ev.str;
 654
 655         /* roll back to original position */
 656         (void)history(h, &ev, H_SET, num);
 657
 658         return rptr;
 659 }
 660
 661 /*
 662  * the real function doing history expansion - takes as argument command
 663  * to do and data upon which the command should be executed
 664  * does expansion the way I've understood readline documentation
 665  *
 666  * returns 0 if data was not modified, 1 if it was and 2 if the string
 667  * should be only printed and not executed; in case of error,
 668  * returns -1 and *result points to NULL
 669  * it's the caller's responsibility to free() the string returned in *result
 670  */
 671 static int
 672 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 673     char **result)
 674 {
 675         char *tmp, *search = NULL, *aptr;
 676         const char *ptr, *cmd;
 677         static char *from = NULL, *to = NULL;
 678         int start, end, idx, has_mods = 0;
 679         int p_on = 0, g_on = 0;
 680
 681         *result = NULL;
 682         aptr = NULL;
 683         ptr = NULL;
 684
 685         /* First get event specifier */
 686         idx = 0;
 687
 688         if (strchr(":^*$", command[offs + 1])) {
 689                 char str[4];
 690                 /*
 691                 * "!:" is shorthand for "!!:".
 692                 * "!^", "!*" and "!$" are shorthand for
 693                 * "!!:^", "!!:*" and "!!:$" respectively.
 694                 */
 695                 str[0] = str[1] = '!';
 696                 str[2] = '0';
 697                 ptr = get_history_event(str, &idx, 0);
 698                 idx = (command[offs + 1] == ':')? 1:0;
 699                 has_mods = 1;
 700         } else {
 701                 if (command[offs + 1] == '#') {
 702                         /* use command so far */
 703                         if ((aptr = el_malloc((offs + 1) * sizeof(*aptr)))
 704                             == NULL)
 705                                 return -1;
 706                         (void)strncpy(aptr, command, offs);
 707                         aptr[offs] = '\0';
 708                         idx = 1;
 709                 } else {
 710                         int     qchar;
 711
 712                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 713                         ptr = get_history_event(command + offs, &idx, qchar);
 714                 }
 715                 has_mods = command[offs + (size_t)idx] == ':';
 716         }
 717
 718         if (ptr == NULL && aptr == NULL)
 719                 return -1;
 720
 721         if (!has_mods) {
 722                 *result = strdup(aptr ? aptr : ptr);
 723                 if (aptr)
 724                         el_free(aptr);
 725                 if (*result == NULL)
 726                         return -1;
 727                 return 1;
 728         }
 729
 730         cmd = command + offs + idx + 1;
 731
 732         /* Now parse any word designators */
 733
 734         if (*cmd == '%')        /* last word matched by ?pat? */
 735                 tmp = strdup(last_search_match? last_search_match:"");
 736         else if (strchr("^*$-0123456789", *cmd)) {
 737                 start = end = -1;
 738                 if (*cmd == '^')
 739                         start = end = 1, cmd++;
 740                 else if (*cmd == '$')
 741                         start = -1, cmd++;
 742                 else if (*cmd == '*')
 743                         start = 1, cmd++;
 744                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 745                         start = 0;
 746                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 747                                 start = start * 10 + *cmd++ - '0';
 748
 749                         if (*cmd == '-') {
 750                                 if (isdigit((unsigned char) cmd[1])) {
 751                                         cmd++;
 752                                         end = 0;
 753                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 754                                                 end = end * 10 + *cmd++ - '0';
 755                                 } else if (cmd[1] == '$') {
 756                                         cmd += 2;
 757                                         end = -1;
 758                                 } else {
 759                                         cmd++;
 760                                         end = -2;
 761                                 }
 762                         } else if (*cmd == '*')
 763                                 end = -1, cmd++;
 764                         else
 765                                 end = start;
 766                 }
 767                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 768                 if (tmp == NULL) {
 769                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 770                             command + offs + idx);
 771                         if (aptr)
 772                                 el_free(aptr);
 773                         return -1;
 774                 }
 775         } else
 776                 tmp = strdup(aptr? aptr:ptr);
 777
 778         if (aptr)
 779                 el_free(aptr);
 780
 781         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 782                 *result = tmp;
 783                 return 1;
 784         }
 785
 786         for (; *cmd; cmd++) {
 787                 if (*cmd == ':')
 788                         continue;
 789                 else if (*cmd == 'h') {         /* remove trailing path */
 790                         if ((aptr = strrchr(tmp, '/')) != NULL)
 791                                 *aptr = '\0';
 792                 } else if (*cmd == 't') {       /* remove leading path */
 793                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 794                                 aptr = strdup(aptr + 1);
 795                                 el_free(tmp);
 796                                 tmp = aptr;
 797                         }
 798                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 799                         if ((aptr = strrchr(tmp, '.')) != NULL)
 800                                 *aptr = '\0';
 801                 } else if (*cmd == 'e') {       /* remove all but suffix */
 802                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 803                                 aptr = strdup(aptr);
 804                                 el_free(tmp);
 805                                 tmp = aptr;
 806                         }
 807                 } else if (*cmd == 'p')         /* print only */
 808                         p_on = 1;
 809                 else if (*cmd == 'g')
 810                         g_on = 2;
 811                 else if (*cmd == 's' || *cmd == '&') {
 812                         char *what, *with, delim;
 813                         size_t len, from_len;
 814                         size_t size;
 815
 816                         if (*cmd == '&' && (from == NULL || to == NULL))
 817                                 continue;
 818                         else if (*cmd == 's') {
 819                                 delim = *(++cmd), cmd++;
 820                                 size = 16;
 821                                 what = el_realloc(from, size * sizeof(*what));
 822                                 if (what == NULL) {
 823                                         el_free(from);
 824                                         el_free(tmp);
 825                                         return 0;
 826                                 }
 827                                 len = 0;
 828                                 for (; *cmd && *cmd != delim; cmd++) {
 829                                         if (*cmd == '\\' && cmd[1] == delim)
 830                                                 cmd++;
 831                                         if (len >= size) {
 832                                                 char *nwhat;
 833                                                 nwhat = el_realloc(what,
 834                                                     (size <<= 1) *
 835                                                     sizeof(*nwhat));
 836                                                 if (nwhat == NULL) {
 837                                                         el_free(what);
 838                                                         el_free(tmp);
 839                                                         return 0;
 840                                                 }
 841                                                 what = nwhat;
 842                                         }
 843                                         what[len++] = *cmd;
 844                                 }
 845                                 what[len] = '\0';
 846                                 from = what;
 847                                 if (*what == '\0') {
 848                                         el_free(what);
 849                                         if (search) {
 850                                                 from = strdup(search);
 851                                                 if (from == NULL) {
 852                                                         el_free(tmp);
 853                                                         return 0;
 854                                                 }
 855                                         } else {
 856                                                 from = NULL;
 857                                                 el_free(tmp);
 858                                                 return -1;
 859                                         }
 860                                 }
 861                                 cmd++;  /* shift after delim */
 862                                 if (!*cmd)
 863                                         continue;
 864
 865                                 size = 16;
 866                                 with = el_realloc(to, size * sizeof(*with));
 867                                 if (with == NULL) {
 868                                         el_free(to);
 869                                         el_free(tmp);
 870                                         return -1;
 871                                 }
 872                                 len = 0;
 873                                 from_len = strlen(from);
 874                                 for (; *cmd && *cmd != delim; cmd++) {
 875                                         if (len + from_len + 1 >= size) {
 876                                                 char *nwith;
 877                                                 size += from_len + 1;
 878                                                 nwith = el_realloc(with,
 879                                                     size * sizeof(*nwith));
 880                                                 if (nwith == NULL) {
 881                                                         el_free(with);
 882                                                         el_free(tmp);
 883                                                         return -1;
 884                                                 }
 885                                                 with = nwith;
 886                                         }
 887                                         if (*cmd == '&') {
 888                                                 /* safe */
 889                                                 (void)strcpy(&with[len], from);
 890                                                 len += from_len;
 891                                                 continue;
 892                                         }
 893                                         if (*cmd == '\\'
 894                                             && (*(cmd + 1) == delim
 895                                                 || *(cmd + 1) == '&'))
 896                                                 cmd++;
 897                                         with[len++] = *cmd;
 898                                 }
 899                                 with[len] = '\0';
 900                                 to = with;
 901                         }
 902
 903                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 904                         if (aptr) {
 905                                 el_free(tmp);
 906                                 tmp = aptr;
 907                         }
 908                         g_on = 0;
 909                 }
 910         }
 911         *result = tmp;
 912         return p_on? 2:1;
 913 }
 914
 915
 916 /*
 917  * csh-style history expansion
 918  */
 919 int
 920 history_expand(char *str, char **output)
 921 {
 922         int ret = 0;
 923         size_t idx, i, size;
 924         char *tmp, *result;
 925
 926         if (h == NULL || e == NULL)
 927                 rl_initialize();
 928
 929         if (history_expansion_char == 0) {
 930                 *output = strdup(str);
 931                 return 0;
 932         }
 933
 934         *output = NULL;
 935         if (str[0] == history_subst_char) {
 936                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 937                 *output = el_malloc((strlen(str) + 4 + 1) * sizeof(**output));
 938                 if (*output == NULL)
 939                         return 0;
 940                 (*output)[0] = (*output)[1] = history_expansion_char;
 941                 (*output)[2] = ':';
 942                 (*output)[3] = 's';
 943                 (void)strcpy((*output) + 4, str);
 944                 str = *output;
 945         } else {
 946                 *output = strdup(str);
 947                 if (*output == NULL)
 948                         return 0;
 949         }
 950
 951 #define ADD_STRING(what, len, fr)                                       \
 952         {                                                               \
 953                 if (idx + len + 1 > size) {                             \
 954                         char *nresult = el_realloc(result,              \
 955                             (size += len + 1) * sizeof(*nresult));      \
 956                         if (nresult == NULL) {                          \
 957                                 el_free(*output);                       \
 958                                 if (/*CONSTCOND*/fr)                    \
 959                                         el_free(tmp);                   \
 960                                 return 0;                               \
 961                         }                                               \
 962                         result = nresult;                               \
 963                 }                                                       \
 964                 (void)strncpy(&result[idx], what, len);                 \
 965                 idx += len;                                             \
 966                 result[idx] = '\0';                                     \
 967         }
 968
 969         result = NULL;
 970         size = idx = 0;
 971         tmp = NULL;
 972         for (i = 0; str[i];) {
 973                 int qchar, loop_again;
 974                 size_t len, start, j;
 975
 976                 qchar = 0;
 977                 loop_again = 1;
 978                 start = j = i;
 979 loop:
 980                 for (; str[j]; j++) {
 981                         if (str[j] == '\\' &&
 982                             str[j + 1] == history_expansion_char) {
 983                                 len = strlen(&str[j + 1]) + 1;
 984                                 memmove(&str[j], &str[j + 1], len);
 985                                 continue;
 986                         }
 987                         if (!loop_again) {
 988                                 if (isspace((unsigned char) str[j])
 989                                     || str[j] == qchar)
 990                                         break;
 991                         }
 992                         if (str[j] == history_expansion_char
 993                             && !strchr(history_no_expand_chars, str[j + 1])
 994                             && (!history_inhibit_expansion_function ||
 995                             (*history_inhibit_expansion_function)(str,
 996                             (int)j) == 0))
 997                                 break;
 998                 }
 999
1000                 if (str[j] && loop_again) {
1001                         i = j;
1002                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
1003                         j++;
1004                         if (str[j] == history_expansion_char)
1005                                 j++;
1006                         loop_again = 0;
1007                         goto loop;
1008                 }
1009                 len = i - start;
1010                 ADD_STRING(&str[start], len, 0);
1011
1012                 if (str[i] == '\0' || str[i] != history_expansion_char) {
1013                         len = j - i;
1014                         ADD_STRING(&str[i], len, 0);
1015                         if (start == 0)
1016                                 ret = 0;
1017                         else
1018                                 ret = 1;
1019                         break;
1020                 }
1021                 ret = _history_expand_command (str, i, (j - i), &tmp);
1022                 if (ret > 0 && tmp) {
1023                         len = strlen(tmp);
1024                         ADD_STRING(tmp, len, 1);
1025                 }
1026                 if (tmp) {
1027                         el_free(tmp);
1028                         tmp = NULL;
1029                 }
1030                 i = j;
1031         }
1032
1033         /* ret is 2 for "print only" option */
1034         if (ret == 2) {
1035                 add_history(result);
1036 #ifdef GDB_411_HACK
1037                 /* gdb 4.11 has been shipped with readline, where */
1038                 /* history_expand() returned -1 when the line     */
1039                 /* should not be executed; in readline 2.1+       */
1040                 /* it should return 2 in such a case              */
1041                 ret = -1;
1042 #endif
1043         }
1044         el_free(*output);
1045         *output = result;
1046
1047         return ret;
1048 }
1049
1050 /*
1051 * Return a string consisting of arguments of "str" from "start" to "end".
1052 */
1053 char *
1054 history_arg_extract(int start, int end, const char *str)
1055 {
1056         size_t  i, len, max;
1057         char    **arr, *result = NULL;
1058
1059         arr = history_tokenize(str);
1060         if (!arr)
1061                 return NULL;
1062         if (arr && *arr == NULL)
1063                 goto out;
1064
1065         for (max = 0; arr[max]; max++)
1066                 continue;
1067         max--;
1068
1069         if (start == '$')
1070                 start = (int)max;
1071         if (end == '$')
1072                 end = (int)max;
1073         if (end < 0)
1074                 end = (int)max + end + 1;
1075         if (start < 0)
1076                 start = end;
1077
1078         if (start < 0 || end < 0 || (size_t)start > max ||
1079             (size_t)end > max || start > end)
1080                 goto out;
1081
1082         for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1083                 len += strlen(arr[i]) + 1;
1084         len++;
1085         result = el_malloc(len * sizeof(*result));
1086         if (result == NULL)
1087                 goto out;
1088
1089         for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1090                 (void)strcpy(result + len, arr[i]);
1091                 len += strlen(arr[i]);
1092                 if (i < (size_t)end)
1093                         result[len++] = ' ';
1094         }
1095         result[len] = '\0';
1096
1097 out:
1098         for (i = 0; arr[i]; i++)
1099                 el_free(arr[i]);
1100         el_free(arr);
1101
1102         return result;
1103 }
1104
1105 /*
1106  * Parse the string into individual tokens,
1107  * similar to how shell would do it.
1108  */
1109 char **
1110 history_tokenize(const char *str)
1111 {
1112         int size = 1, idx = 0, i, start;
1113         size_t len;
1114         char **result = NULL, *temp, delim = '\0';
1115
1116         for (i = 0; str[i];) {
1117                 while (isspace((unsigned char) str[i]))
1118                         i++;
1119                 start = i;
1120                 for (; str[i];) {
1121                         if (str[i] == '\\') {
1122                                 if (str[i+1] != '\0')
1123                                         i++;
1124                         } else if (str[i] == delim)
1125                                 delim = '\0';
1126                         else if (!delim &&
1127                                     (isspace((unsigned char) str[i]) ||
1128                                 strchr("()<>;&|$", str[i])))
1129                                 break;
1130                         else if (!delim && strchr("'`\"", str[i]))
1131                                 delim = str[i];
1132                         if (str[i])
1133                                 i++;
1134                 }
1135
1136                 if (idx + 2 >= size) {
1137                         char **nresult;
1138                         size <<= 1;
1139                         nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1140                         if (nresult == NULL) {
1141                                 el_free(result);
1142                                 return NULL;
1143                         }
1144                         result = nresult;
1145                 }
1146                 len = (size_t)i - (size_t)start;
1147                 temp = el_malloc((size_t)(len + 1) * sizeof(*temp));
1148                 if (temp == NULL) {
1149                         for (i = 0; i < idx; i++)
1150                                 el_free(result[i]);
1151                         el_free(result);
1152                         return NULL;
1153                 }
1154                 (void)strncpy(temp, &str[start], len);
1155                 temp[len] = '\0';
1156                 result[idx++] = temp;
1157                 result[idx] = NULL;
1158                 if (str[i])
1159                         i++;
1160         }
1161         return result;
1162 }
1163
1164
1165 /*
1166  * limit size of history record to ``max'' events
1167  */
1168 void
1169 stifle_history(int max)
1170 {
1171         HistEvent ev;
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 }
1179
1180
1181 /*
1182  * "unlimit" size of history - set the limit to maximum allowed int value
1183  */
1184 int
1185 unstifle_history(void)
1186 {
1187         HistEvent ev;
1188         int omax;
1189
1190         history(h, &ev, H_SETSIZE, INT_MAX);
1191         omax = max_input_history;
1192         max_input_history = INT_MAX;
1193         return omax;            /* some value _must_ be returned */
1194 }
1195
1196
1197 int
1198 history_is_stifled(void)
1199 {
1200
1201         /* cannot return true answer */
1202         return max_input_history != INT_MAX;
1203 }
1204
1205 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1206
1207 int
1208 history_truncate_file (const char *filename, int nlines)
1209 {
1210         int ret = 0;
1211         FILE *fp, *tp;
1212         char template[sizeof(_history_tmp_template)];
1213         char buf[4096];
1214         int fd;
1215         char *cp;
1216         off_t off;
1217         int count = 0;
1218         ssize_t left = 0;
1219
1220         if (filename == NULL && (filename = _default_history_file()) == NULL)
1221                 return errno;
1222         if ((fp = fopen(filename, "r+")) == NULL)
1223                 return errno;
1224         strcpy(template, _history_tmp_template);
1225         if ((fd = mkstemp(template)) == -1) {
1226                 ret = errno;
1227                 goto out1;
1228         }
1229
1230         if ((tp = fdopen(fd, "r+")) == NULL) {
1231                 close(fd);
1232                 ret = errno;
1233                 goto out2;
1234         }
1235
1236         for(;;) {
1237                 if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1238                         if (ferror(fp)) {
1239                                 ret = errno;
1240                                 break;
1241                         }
1242                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1243                             (off_t)-1) {
1244                                 ret = errno;
1245                                 break;
1246                         }
1247                         left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1248                         if (ferror(fp)) {
1249                                 ret = errno;
1250                                 break;
1251                         }
1252                         if (left == 0) {
1253                                 count--;
1254                                 left = sizeof(buf);
1255                         } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1256                             != 1) {
1257                                 ret = errno;
1258                                 break;
1259                         }
1260                         fflush(tp);
1261                         break;
1262                 }
1263                 if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1264                         ret = errno;
1265                         break;
1266                 }
1267                 count++;
1268         }
1269         if (ret)
1270                 goto out3;
1271         cp = buf + left - 1;
1272         if(*cp != '\n')
1273                 cp++;
1274         for(;;) {
1275                 while (--cp >= buf) {
1276                         if (*cp == '\n') {
1277                                 if (--nlines == 0) {
1278                                         if (++cp >= buf + sizeof(buf)) {
1279                                                 count++;
1280                                                 cp = buf;
1281                                         }
1282                                         break;
1283                                 }
1284                         }
1285                 }
1286                 if (nlines <= 0 || count == 0)
1287                         break;
1288                 count--;
1289                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1290                         ret = errno;
1291                         break;
1292                 }
1293                 if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1294                         if (ferror(tp)) {
1295                                 ret = errno;
1296                                 break;
1297                         }
1298                         ret = EAGAIN;
1299                         break;
1300                 }
1301                 cp = buf + sizeof(buf);
1302         }
1303
1304         if (ret || nlines > 0)
1305                 goto out3;
1306
1307         if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1308                 ret = errno;
1309                 goto out3;
1310         }
1311
1312         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1313             (off_t)-1) {
1314                 ret = errno;
1315                 goto out3;
1316         }
1317
1318         for(;;) {
1319                 if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1320                         if (ferror(fp))
1321                                 ret = errno;
1322                         break;
1323                 }
1324                 if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1325                         ret = errno;
1326                         break;
1327                 }
1328         }
1329         fflush(fp);
1330         if((off = ftello(fp)) > 0)
1331                 (void)ftruncate(fileno(fp), off);
1332 out3:
1333         fclose(tp);
1334 out2:
1335         unlink(template);
1336 out1:
1337         fclose(fp);
1338
1339         return ret;
1340 }
1341
1342
1343 /*
1344  * read history from a file given
1345  */
1346 int
1347 read_history(const char *filename)
1348 {
1349         HistEvent ev;
1350
1351         if (h == NULL || e == NULL)
1352                 rl_initialize();
1353         if (filename == NULL && (filename = _default_history_file()) == NULL)
1354                 return errno;
1355         return history(h, &ev, H_LOAD, filename) == -1 ?
1356             (errno ? errno : EINVAL) : 0;
1357 }
1358
1359
1360 /*
1361  * write history to a file given
1362  */
1363 int
1364 write_history(const char *filename)
1365 {
1366         HistEvent ev;
1367
1368         if (h == NULL || e == NULL)
1369                 rl_initialize();
1370         if (filename == NULL && (filename = _default_history_file()) == NULL)
1371                 return errno;
1372         return history(h, &ev, H_SAVE, filename) == -1 ?
1373             (errno ? errno : EINVAL) : 0;
1374 }
1375
1376
1377 /*
1378  * returns history ``num''th event
1379  *
1380  * returned pointer points to static variable
1381  */
1382 HIST_ENTRY *
1383 history_get(int num)
1384 {
1385         static HIST_ENTRY she;
1386         HistEvent ev;
1387         int curr_num;
1388
1389         if (h == NULL || e == NULL)
1390                 rl_initialize();
1391
1392         /* save current position */
1393         if (history(h, &ev, H_CURR) != 0)
1394                 return NULL;
1395         curr_num = ev.num;
1396
1397         /* start from the oldest */
1398         if (history(h, &ev, H_LAST) != 0)
1399                 return NULL;    /* error */
1400
1401         /* look forwards for event matching specified offset */
1402         if (history(h, &ev, H_NEXT_EVDATA, num, &she.data))
1403                 return NULL;
1404
1405         she.line = ev.str;
1406
1407         /* restore pointer to where it was */
1408         (void)history(h, &ev, H_SET, curr_num);
1409
1410         return &she;
1411 }
1412
1413
1414 /*
1415  * add the line to history table
1416  */
1417 int
1418 add_history(const char *line)
1419 {
1420         HistEvent ev;
1421
1422         if (line == NULL)
1423                 return 0;
1424
1425         if (h == NULL || e == NULL)
1426                 rl_initialize();
1427
1428         (void)history(h, &ev, H_ENTER, line);
1429         if (history(h, &ev, H_GETSIZE) == 0)
1430                 history_length = ev.num;
1431
1432         return !(history_length > 0); /* return 0 if all is okay */
1433 }
1434
1435
1436 /*
1437  * remove the specified entry from the history list and return it.
1438  */
1439 HIST_ENTRY *
1440 remove_history(int num)
1441 {
1442         HIST_ENTRY *he;
1443         HistEvent ev;
1444
1445         if (h == NULL || e == NULL)
1446                 rl_initialize();
1447
1448         if ((he = el_malloc(sizeof(*he))) == NULL)
1449                 return NULL;
1450
1451         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1452                 el_free(he);
1453                 return NULL;
1454         }
1455
1456         he->line = ev.str;
1457         if (history(h, &ev, H_GETSIZE) == 0)
1458                 history_length = ev.num;
1459
1460         return he;
1461 }
1462
1463
1464 /*
1465  * replace the line and data of the num-th entry
1466  */
1467 HIST_ENTRY *
1468 replace_history_entry(int num, const char *line, histdata_t data)
1469 {
1470         HIST_ENTRY *he;
1471         HistEvent ev;
1472         int curr_num;
1473
1474         if (h == NULL || e == NULL)
1475                 rl_initialize();
1476
1477         /* save current position */
1478         if (history(h, &ev, H_CURR) != 0)
1479                 return NULL;
1480         curr_num = ev.num;
1481
1482         /* start from the oldest */
1483         if (history(h, &ev, H_LAST) != 0)
1484                 return NULL;    /* error */
1485
1486         if ((he = el_malloc(sizeof(*he))) == NULL)
1487                 return NULL;
1488
1489         /* look forwards for event matching specified offset */
1490         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1491                 goto out;
1492
1493         he->line = strdup(ev.str);
1494         if (he->line == NULL)
1495                 goto out;
1496
1497         if (history(h, &ev, H_REPLACE, line, data))
1498                 goto out;
1499
1500         /* restore pointer to where it was */
1501         if (history(h, &ev, H_SET, curr_num))
1502                 goto out;
1503
1504         return he;
1505 out:
1506         el_free(he);
1507         return NULL;
1508 }
1509
1510 /*
1511  * clear the history list - delete all entries
1512  */
1513 void
1514 clear_history(void)
1515 {
1516         HistEvent ev;
1517
1518         if (h == NULL || e == NULL)
1519                 rl_initialize();
1520
1521         (void)history(h, &ev, H_CLEAR);
1522         history_length = 0;
1523 }
1524
1525
1526 /*
1527  * returns offset of the current history event
1528  */
1529 int
1530 where_history(void)
1531 {
1532         HistEvent ev;
1533         int curr_num, off;
1534
1535         if (history(h, &ev, H_CURR) != 0)
1536                 return 0;
1537         curr_num = ev.num;
1538
1539         (void)history(h, &ev, H_FIRST);
1540         off = 1;
1541         while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1542                 off++;
1543
1544         return off;
1545 }
1546
1547
1548 /*
1549  * returns current history event or NULL if there is no such event
1550  */
1551 HIST_ENTRY *
1552 current_history(void)
1553 {
1554
1555         return _move_history(H_CURR);
1556 }
1557
1558
1559 /*
1560  * returns total number of bytes history events' data are using
1561  */
1562 int
1563 history_total_bytes(void)
1564 {
1565         HistEvent ev;
1566         int curr_num;
1567         size_t size;
1568
1569         if (history(h, &ev, H_CURR) != 0)
1570                 return -1;
1571         curr_num = ev.num;
1572
1573         (void)history(h, &ev, H_FIRST);
1574         size = 0;
1575         do
1576                 size += strlen(ev.str) * sizeof(*ev.str);
1577         while (history(h, &ev, H_NEXT) == 0);
1578
1579         /* get to the same position as before */
1580         history(h, &ev, H_PREV_EVENT, curr_num);
1581
1582         return (int)size;
1583 }
1584
1585
1586 /*
1587  * sets the position in the history list to ``pos''
1588  */
1589 int
1590 history_set_pos(int pos)
1591 {
1592         HistEvent ev;
1593         int curr_num;
1594
1595         if (pos >= history_length || pos < 0)
1596                 return -1;
1597
1598         (void)history(h, &ev, H_CURR);
1599         curr_num = ev.num;
1600
1601         /*
1602          * use H_DELDATA to set to nth history (without delete) by passing
1603          * (void **)-1
1604          */
1605         if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1606                 (void)history(h, &ev, H_SET, curr_num);
1607                 return -1;
1608         }
1609         return 0;
1610 }
1611
1612
1613 /*
1614  * returns previous event in history and shifts pointer accordingly
1615  */
1616 HIST_ENTRY *
1617 previous_history(void)
1618 {
1619
1620         return _move_history(H_PREV);
1621 }
1622
1623
1624 /*
1625  * returns next event in history and shifts pointer accordingly
1626  */
1627 HIST_ENTRY *
1628 next_history(void)
1629 {
1630
1631         return _move_history(H_NEXT);
1632 }
1633
1634
1635 /*
1636  * searches for first history event containing the str
1637  */
1638 int
1639 history_search(const char *str, int direction)
1640 {
1641         HistEvent ev;
1642         const char *strp;
1643         int curr_num;
1644
1645         if (history(h, &ev, H_CURR) != 0)
1646                 return -1;
1647         curr_num = ev.num;
1648
1649         for (;;) {
1650                 if ((strp = strstr(ev.str, str)) != NULL)
1651                         return (int)(strp - ev.str);
1652                 if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1653                         break;
1654         }
1655         (void)history(h, &ev, H_SET, curr_num);
1656         return -1;
1657 }
1658
1659
1660 /*
1661  * searches for first history event beginning with str
1662  */
1663 int
1664 history_search_prefix(const char *str, int direction)
1665 {
1666         HistEvent ev;
1667
1668         return (history(h, &ev, direction < 0 ?
1669             H_PREV_STR : H_NEXT_STR, str));
1670 }
1671
1672
1673 /*
1674  * search for event in history containing str, starting at offset
1675  * abs(pos); continue backward, if pos<0, forward otherwise
1676  */
1677 /* ARGSUSED */
1678 int
1679 history_search_pos(const char *str,
1680                    int direction __attribute__((__unused__)), int pos)
1681 {
1682         HistEvent ev;
1683         int curr_num, off;
1684
1685         off = (pos > 0) ? pos : -pos;
1686         pos = (pos > 0) ? 1 : -1;
1687
1688         if (history(h, &ev, H_CURR) != 0)
1689                 return -1;
1690         curr_num = ev.num;
1691
1692         if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1693                 return -1;
1694
1695         for (;;) {
1696                 if (strstr(ev.str, str))
1697                         return off;
1698                 if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1699                         break;
1700         }
1701
1702         /* set "current" pointer back to previous state */
1703         (void)history(h, &ev,
1704             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1705
1706         return -1;
1707 }
1708
1709
1710 /********************************/
1711 /* completion functions */
1712
1713 char *
1714 tilde_expand(char *name)
1715 {
1716         return fn_tilde_expand(name);
1717 }
1718
1719 char *
1720 filename_completion_function(const char *name, int state)
1721 {
1722         return fn_filename_completion_function(name, state);
1723 }
1724
1725 /*
1726  * a completion generator for usernames; returns _first_ username
1727  * which starts with supplied text
1728  * text contains a partial username preceded by random character
1729  * (usually '~'); state resets search from start (??? should we do that anyway)
1730  * it's the caller's responsibility to free the returned value
1731  */
1732 char *
1733 username_completion_function(const char *text, int state)
1734 {
1735 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1736         struct passwd pwres;
1737         char pwbuf[1024];
1738 #endif
1739         struct passwd *pass = NULL;
1740
1741         if (text[0] == '\0')
1742                 return NULL;
1743
1744         if (*text == '~')
1745                 text++;
1746
1747         if (state == 0)
1748                 setpwent();
1749
1750         while (
1751 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1752             getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pass) == 0 && pass != NULL
1753 #else
1754             (pass = getpwent()) != NULL
1755 #endif
1756             && text[0] == pass->pw_name[0]
1757             && strcmp(text, pass->pw_name) == 0)
1758                 continue;
1759
1760         if (pass == NULL) {
1761                 endpwent();
1762                 return NULL;
1763         }
1764         return strdup(pass->pw_name);
1765 }
1766
1767
1768 /*
1769  * el-compatible wrapper to send TSTP on ^Z
1770  */
1771 /* ARGSUSED */
1772 static unsigned char
1773 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1774 {
1775         (void)kill(0, SIGTSTP);
1776         return CC_NORM;
1777 }
1778
1779 /*
1780  * Display list of strings in columnar format on readline's output stream.
1781  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1782  * 'max' is maximum length of string in 'matches'.
1783  */
1784 void
1785 rl_display_match_list(char **matches, int len, int max)
1786 {
1787
1788         fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1789 }
1790
1791 static const char *
1792 /*ARGSUSED*/
1793 _rl_completion_append_character_function(const char *dummy
1794     __attribute__((__unused__)))
1795 {
1796         static char buf[2];
1797         buf[0] = (char)rl_completion_append_character;
1798         buf[1] = '\0';
1799         return buf;
1800 }
1801
1802
1803 /*
1804  * complete word at current point
1805  */
1806 /* ARGSUSED */
1807 int
1808 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1809 {
1810 #ifdef WIDECHAR
1811         static ct_buffer_t wbreak_conv, sprefix_conv;
1812 #endif
1813         char *breakchars;
1814
1815         if (h == NULL || e == NULL)
1816                 rl_initialize();
1817
1818         if (rl_inhibit_completion) {
1819                 char arr[2];
1820                 arr[0] = (char)invoking_key;
1821                 arr[1] = '\0';
1822                 el_insertstr(e, arr);
1823                 return CC_REFRESH;
1824         }
1825
1826         if (rl_completion_word_break_hook != NULL)
1827                 breakchars = (*rl_completion_word_break_hook)();
1828         else
1829                 breakchars = rl_basic_word_break_characters;
1830
1831         _rl_update_pos();
1832
1833         /* Just look at how many global variables modify this operation! */
1834         return fn_complete(e,
1835             (rl_compentry_func_t *)rl_completion_entry_function,
1836             rl_attempted_completion_function,
1837             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1838             ct_decode_string(breakchars, &sprefix_conv),
1839             _rl_completion_append_character_function,
1840             (size_t)rl_completion_query_items,
1841             &rl_completion_type, &rl_attempted_completion_over,
1842             &rl_point, &rl_end, NULL, NULL, NULL);
1843
1844
1845 }
1846
1847
1848 /* ARGSUSED */
1849 static unsigned char
1850 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1851 {
1852         return (unsigned char)rl_complete(0, ch);
1853 }
1854
1855 /*
1856  * misc other functions
1857  */
1858
1859 /*
1860  * bind key c to readline-type function func
1861  */
1862 int
1863 rl_bind_key(int c, rl_command_func_t *func)
1864 {
1865         int retval = -1;
1866
1867         if (h == NULL || e == NULL)
1868                 rl_initialize();
1869
1870         if (func == rl_insert) {
1871                 /* XXX notice there is no range checking of ``c'' */
1872                 e->el_map.key[c] = ED_INSERT;
1873                 retval = 0;
1874         }
1875         return retval;
1876 }
1877
1878
1879 /*
1880  * read one key from input - handles chars pushed back
1881  * to input stream also
1882  */
1883 int
1884 rl_read_key(void)
1885 {
1886         char fooarr[2 * sizeof(int)];
1887
1888         if (e == NULL || h == NULL)
1889                 rl_initialize();
1890
1891         return el_getc(e, fooarr);
1892 }
1893
1894
1895 /*
1896  * reset the terminal
1897  */
1898 /* ARGSUSED */
1899 void
1900 rl_reset_terminal(const char *p __attribute__((__unused__)))
1901 {
1902
1903         if (h == NULL || e == NULL)
1904                 rl_initialize();
1905         el_reset(e);
1906 }
1907
1908
1909 /*
1910  * insert character ``c'' back into input stream, ``count'' times
1911  */
1912 int
1913 rl_insert(int count, int c)
1914 {
1915         char arr[2];
1916
1917         if (h == NULL || e == NULL)
1918                 rl_initialize();
1919
1920         /* XXX - int -> char conversion can lose on multichars */
1921         arr[0] = (char)c;
1922         arr[1] = '\0';
1923
1924         for (; count > 0; count--)
1925                 el_push(e, arr);
1926
1927         return 0;
1928 }
1929
1930 int
1931 rl_insert_text(const char *text)
1932 {
1933         if (!text || *text == 0)
1934                 return 0;
1935
1936         if (h == NULL || e == NULL)
1937                 rl_initialize();
1938
1939         if (el_insertstr(e, text) < 0)
1940                 return 0;
1941         return (int)strlen(text);
1942 }
1943
1944 /*ARGSUSED*/
1945 int
1946 rl_newline(int count __attribute__((__unused__)),
1947     int c __attribute__((__unused__)))
1948 {
1949         /*
1950          * Readline-4.0 appears to ignore the args.
1951          */
1952         return rl_insert(1, '\n');
1953 }
1954
1955 /*ARGSUSED*/
1956 static unsigned char
1957 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
1958 {
1959         if (map[c] == NULL)
1960             return CC_ERROR;
1961
1962         _rl_update_pos();
1963
1964         (*map[c])(1, c);
1965
1966         /* If rl_done was set by the above call, deal with it here */
1967         if (rl_done)
1968                 return CC_EOF;
1969
1970         return CC_NORM;
1971 }
1972
1973 int
1974 rl_add_defun(const char *name, rl_command_func_t *fun, int c)
1975 {
1976         char dest[8];
1977         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1978                 return -1;
1979         map[(unsigned char)c] = fun;
1980         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1981         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1982         el_set(e, EL_BIND, dest, name, NULL);
1983         return 0;
1984 }
1985
1986 void
1987 rl_callback_read_char(void)
1988 {
1989         int count = 0, done = 0;
1990         const char *buf = el_gets(e, &count);
1991         char *wbuf;
1992
1993         if (buf == NULL || count-- <= 0)
1994                 return;
1995         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1996                 done = 1;
1997         if (buf[count] == '\n' || buf[count] == '\r')
1998                 done = 2;
1999
2000         if (done && rl_linefunc != NULL) {
2001                 el_set(e, EL_UNBUFFERED, 0);
2002                 if (done == 2) {
2003                     if ((wbuf = strdup(buf)) != NULL)
2004                         wbuf[count] = '\0';
2005                 } else
2006                         wbuf = NULL;
2007                 (*(void (*)(const char *))rl_linefunc)(wbuf);
2008                 el_set(e, EL_UNBUFFERED, 1);
2009         }
2010 }
2011
2012 void
2013 rl_callback_handler_install(const char *prompt, rl_vcpfunc_t *linefunc)
2014 {
2015         if (e == NULL) {
2016                 rl_initialize();
2017         }
2018         (void)rl_set_prompt(prompt);
2019         rl_linefunc = linefunc;
2020         el_set(e, EL_UNBUFFERED, 1);
2021 }
2022
2023 void
2024 rl_callback_handler_remove(void)
2025 {
2026         el_set(e, EL_UNBUFFERED, 0);
2027         rl_linefunc = NULL;
2028 }
2029
2030 void
2031 rl_redisplay(void)
2032 {
2033         char a[2];
2034         a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2035         a[1] = '\0';
2036         el_push(e, a);
2037 }
2038
2039 int
2040 rl_get_previous_history(int count, int key)
2041 {
2042         char a[2];
2043         a[0] = (char)key;
2044         a[1] = '\0';
2045         while (count--)
2046                 el_push(e, a);
2047         return 0;
2048 }
2049
2050 void
2051 /*ARGSUSED*/
2052 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2053 {
2054         el_set(e, EL_PREP_TERM, 1);
2055 }
2056
2057 void
2058 rl_deprep_terminal(void)
2059 {
2060         el_set(e, EL_PREP_TERM, 0);
2061 }
2062
2063 int
2064 rl_read_init_file(const char *s)
2065 {
2066         return el_source(e, s);
2067 }
2068
2069 int
2070 rl_parse_and_bind(const char *line)
2071 {
2072         const char **argv;
2073         int argc;
2074         Tokenizer *tok;
2075
2076         tok = tok_init(NULL);
2077         tok_str(tok, line, &argc, &argv);
2078         argc = el_parse(e, argc, argv);
2079         tok_end(tok);
2080         return argc ? 1 : 0;
2081 }
2082
2083 int
2084 rl_variable_bind(const char *var, const char *value)
2085 {
2086         /*
2087          * The proper return value is undocument, but this is what the
2088          * readline source seems to do.
2089          */
2090         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2091 }
2092
2093 void
2094 rl_stuff_char(int c)
2095 {
2096         char buf[2];
2097
2098         buf[0] = (char)c;
2099         buf[1] = '\0';
2100         el_insertstr(e, buf);
2101 }
2102
2103 static int
2104 _rl_event_read_char(EditLine *el, wchar_t *wc)
2105 {
2106         char    ch;
2107         int     n;
2108         ssize_t num_read = 0;
2109
2110         ch = '\0';
2111         *wc = L'\0';
2112         while (rl_event_hook) {
2113
2114                 (*rl_event_hook)();
2115
2116 #if defined(FIONREAD)
2117                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2118                         return -1;
2119                 if (n)
2120                         num_read = read(el->el_infd, &ch, (size_t)1);
2121                 else
2122                         num_read = 0;
2123 #elif defined(F_SETFL) && defined(O_NDELAY)
2124                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2125                         return -1;
2126                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2127                         return -1;
2128                 num_read = read(el->el_infd, &ch, 1);
2129                 if (fcntl(el->el_infd, F_SETFL, n))
2130                         return -1;
2131 #else
2132                 /* not non-blocking, but what you gonna do? */
2133                 num_read = read(el->el_infd, &ch, 1);
2134                 return -1;
2135 #endif
2136
2137                 if (num_read < 0 && errno == EAGAIN)
2138                         continue;
2139                 if (num_read == 0)
2140                         continue;
2141                 break;
2142         }
2143         if (!rl_event_hook)
2144                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2145         *wc = (wchar_t)ch;
2146         return (int)num_read;
2147 }
2148
2149 static void
2150 _rl_update_pos(void)
2151 {
2152         const LineInfo *li = el_line(e);
2153
2154         rl_point = (int)(li->cursor - li->buffer);
2155         rl_end = (int)(li->lastchar - li->buffer);
2156 }
2157
2158 void
2159 rl_get_screen_size(int *rows, int *cols)
2160 {
2161         if (rows)
2162                 el_get(e, EL_GETTC, "li", rows, (void *)0);
2163         if (cols)
2164                 el_get(e, EL_GETTC, "co", cols, (void *)0);
2165 }
2166
2167 void
2168 rl_set_screen_size(int rows, int cols)
2169 {
2170         char buf[64];
2171         (void)snprintf(buf, sizeof(buf), "%d", rows);
2172         el_set(e, EL_SETTC, "li", buf, NULL);
2173         (void)snprintf(buf, sizeof(buf), "%d", cols);
2174         el_set(e, EL_SETTC, "co", buf, NULL);
2175 }
2176
2177 char **
2178 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2179 {
2180         size_t len, max, i, j, min;
2181         char **list, *match, *a, *b;
2182
2183         len = 1;
2184         max = 10;
2185         if ((list = el_malloc(max * sizeof(*list))) == NULL)
2186                 return NULL;
2187
2188         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2189                 list[len++] = match;
2190                 if (len == max) {
2191                         char **nl;
2192                         max += 10;
2193                         if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2194                                 goto out;
2195                         list = nl;
2196                 }
2197         }
2198         if (len == 1)
2199                 goto out;
2200         list[len] = NULL;
2201         if (len == 2) {
2202                 if ((list[0] = strdup(list[1])) == NULL)
2203                         goto out;
2204                 return list;
2205         }
2206         qsort(&list[1], len - 1, sizeof(*list),
2207             (int (*)(const void *, const void *)) strcmp);
2208         min = SIZE_MAX;
2209         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2210                 b = list[i + 1];
2211                 for (j = 0; a[j] && a[j] == b[j]; j++)
2212                         continue;
2213                 if (min > j)
2214                         min = j;
2215         }
2216         if (min == 0 && *str) {
2217                 if ((list[0] = strdup(str)) == NULL)
2218                         goto out;
2219         } else {
2220                 if ((list[0] = el_malloc((min + 1) * sizeof(*list[0]))) == NULL)
2221                         goto out;
2222                 (void)memcpy(list[0], list[1], min);
2223                 list[0][min] = '\0';
2224         }
2225         return list;
2226
2227 out:
2228         el_free(list);
2229         return NULL;
2230 }
2231
2232 char *
2233 rl_filename_completion_function (const char *text, int state)
2234 {
2235         return fn_filename_completion_function(text, state);
2236 }
2237
2238 void
2239 rl_forced_update_display(void)
2240 {
2241         el_set(e, EL_REFRESH);
2242 }
2243
2244 int
2245 _rl_abort_internal(void)
2246 {
2247         el_beep(e);
2248         longjmp(topbuf, 1);
2249         /*NOTREACHED*/
2250 }
2251
2252 int
2253 _rl_qsort_string_compare(char **s1, char **s2)
2254 {
2255         return strcoll(*s1, *s2);
2256 }
2257
2258 HISTORY_STATE *
2259 history_get_history_state(void)
2260 {
2261         HISTORY_STATE *hs;
2262
2263         if ((hs = el_malloc(sizeof(*hs))) == NULL)
2264                 return NULL;
2265         hs->length = history_length;
2266         return hs;
2267 }
2268
2269 int
2270 /*ARGSUSED*/
2271 rl_kill_text(int from __attribute__((__unused__)),
2272     int to __attribute__((__unused__)))
2273 {
2274         return 0;
2275 }
2276
2277 Keymap
2278 rl_make_bare_keymap(void)
2279 {
2280         return NULL;
2281 }
2282
2283 Keymap
2284 rl_get_keymap(void)
2285 {
2286         return NULL;
2287 }
2288
2289 void
2290 /*ARGSUSED*/
2291 rl_set_keymap(Keymap k __attribute__((__unused__)))
2292 {
2293 }
2294
2295 int
2296 /*ARGSUSED*/
2297 rl_generic_bind(int type __attribute__((__unused__)),
2298     const char * keyseq __attribute__((__unused__)),
2299     const char * data __attribute__((__unused__)),
2300     Keymap k __attribute__((__unused__)))
2301 {
2302         return 0;
2303 }
2304
2305 int
2306 /*ARGSUSED*/
2307 rl_bind_key_in_map(int key __attribute__((__unused__)),
2308     rl_command_func_t *fun __attribute__((__unused__)),
2309     Keymap k __attribute__((__unused__)))
2310 {
2311         return 0;
2312 }
2313
2314 /* unsupported, but needed by python */
2315 void
2316 rl_cleanup_after_signal(void)
2317 {
2318 }
2319
2320 int
2321 rl_on_new_line(void)
2322 {
2323         return 0;
2324 }
2325
2326 void
2327 rl_free_line_state(void)
2328 {
2329 }
2330
2331 int
2332 /*ARGSUSED*/
2333 rl_set_keyboard_input_timeout(int u __attribute__((__unused__)))
2334 {
2335         return 0;
2336 }