contrib/libedit/src/readline.c

   1 /*      $NetBSD: readline.c,v 1.114 2015/03/24 21:29:52 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 1.114 2015/03/24 21:29:52 christos Exp $");
  35 #endif /* not lint && not SCCSID */
  36
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <stdio.h>
  40 #include <dirent.h>
  41 #include <string.h>
  42 #include <pwd.h>
  43 #include <ctype.h>
  44 #include <stdlib.h>
  45 #include <unistd.h>
  46 #include <limits.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <setjmp.h>
  50 #include <vis.h>
  51
  52 #include "editline/readline.h"
  53 #include "el.h"
  54 #include "fcns.h"               /* for EL_NUM_FCNS */
  55 #include "histedit.h"
  56 #include "filecomplete.h"
  57
  58 #if !defined(SIZE_T_MAX)
  59 # define SIZE_T_MAX (size_t)(-1)
  60 #endif
  61
  62 void rl_prep_terminal(int);
  63 void rl_deprep_terminal(void);
  64
  65 /* for rl_complete() */
  66 #define TAB             '\r'
  67
  68 /* see comment at the #ifdef for sense of this */
  69 /* #define GDB_411_HACK */
  70
  71 /* readline compatibility stuff - look at readline sources/documentation */
  72 /* to see what these variables mean */
  73 const char *rl_library_version = "EditLine wrapper";
  74 int rl_readline_version = RL_READLINE_VERSION;
  75 static char empty[] = { '\0' };
  76 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  77 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  78     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  79 char *rl_readline_name = empty;
  80 FILE *rl_instream = NULL;
  81 FILE *rl_outstream = NULL;
  82 int rl_point = 0;
  83 int rl_end = 0;
  84 char *rl_line_buffer = NULL;
  85 VCPFunction *rl_linefunc = NULL;
  86 int rl_done = 0;
  87 VFunction *rl_event_hook = NULL;
  88 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  89     emacs_meta_keymap,
  90     emacs_ctlx_keymap;
  91 /*
  92  * The following is not implemented; we always catch signals in the
  93  * libedit fashion: set handlers on entry to el_gets() and clear them
  94  * on the way out. This simplistic approach works for most cases; if
  95  * it does not work for your application, please let us know.
  96  */
  97 int rl_catch_signals = 1;
  98 int rl_catch_sigwinch = 1;
  99
 100 int history_base = 1;           /* probably never subject to change */
 101 int history_length = 0;
 102 int max_input_history = 0;
 103 char history_expansion_char = '!';
 104 char history_subst_char = '^';
 105 char *history_no_expand_chars = expand_chars;
 106 Function *history_inhibit_expansion_function = NULL;
 107 char *history_arg_extract(int start, int end, const char *str);
 108
 109 int rl_inhibit_completion = 0;
 110 int rl_attempted_completion_over = 0;
 111 char *rl_basic_word_break_characters = break_chars;
 112 char *rl_completer_word_break_characters = NULL;
 113 char *rl_completer_quote_characters = NULL;
 114 Function *rl_completion_entry_function = NULL;
 115 char *(*rl_completion_word_break_hook)(void) = NULL;
 116 CPPFunction *rl_attempted_completion_function = NULL;
 117 Function *rl_pre_input_hook = NULL;
 118 Function *rl_startup1_hook = NULL;
 119 int (*rl_getc_function)(FILE *) = NULL;
 120 char *rl_terminal_name = NULL;
 121 int rl_already_prompted = 0;
 122 int rl_filename_completion_desired = 0;
 123 int rl_ignore_completion_duplicates = 0;
 124 int readline_echoing_p = 1;
 125 int _rl_print_completions_horizontally = 0;
 126 VFunction *rl_redisplay_function = NULL;
 127 Function *rl_startup_hook = NULL;
 128 VFunction *rl_completion_display_matches_hook = NULL;
 129 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 130 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 131 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 132
 133 /*
 134  * The current prompt string.
 135  */
 136 char *rl_prompt = NULL;
 137 /*
 138  * This is set to character indicating type of completion being done by
 139  * rl_complete_internal(); this is available for application completion
 140  * functions.
 141  */
 142 int rl_completion_type = 0;
 143
 144 /*
 145  * If more than this number of items results from query for possible
 146  * completions, we ask user if they are sure to really display the list.
 147  */
 148 int rl_completion_query_items = 100;
 149
 150 /*
 151  * List of characters which are word break characters, but should be left
 152  * in the parsed text when it is passed to the completion function.
 153  * Shell uses this to help determine what kind of completing to do.
 154  */
 155 char *rl_special_prefixes = NULL;
 156
 157 /*
 158  * This is the character appended to the completed words if at the end of
 159  * the line. Default is ' ' (a space).
 160  */
 161 int rl_completion_append_character = ' ';
 162
 163 /* stuff below is used internally by libedit for readline emulation */
 164
 165 static History *h = NULL;
 166 static EditLine *e = NULL;
 167 static Function *map[256];
 168 static jmp_buf topbuf;
 169
 170 /* internal functions */
 171 static unsigned char     _el_rl_complete(EditLine *, int);
 172 static unsigned char     _el_rl_tstp(EditLine *, int);
 173 static char             *_get_prompt(EditLine *);
 174 static int               _getc_function(EditLine *, char *);
 175 static HIST_ENTRY       *_move_history(int);
 176 static int               _history_expand_command(const char *, size_t, size_t,
 177     char **);
 178 static char             *_rl_compat_sub(const char *, const char *,
 179     const char *, int);
 180 static int               _rl_event_read_char(EditLine *, char *);
 181 static void              _rl_update_pos(void);
 182
 183
 184 /* ARGSUSED */
 185 static char *
 186 _get_prompt(EditLine *el __attribute__((__unused__)))
 187 {
 188         rl_already_prompted = 1;
 189         return rl_prompt;
 190 }
 191
 192
 193 /*
 194  * generic function for moving around history
 195  */
 196 static HIST_ENTRY *
 197 _move_history(int op)
 198 {
 199         HistEvent ev;
 200         static HIST_ENTRY rl_he;
 201
 202         if (history(h, &ev, op) != 0)
 203                 return NULL;
 204
 205         rl_he.line = ev.str;
 206         rl_he.data = NULL;
 207
 208         return &rl_he;
 209 }
 210
 211
 212 /*
 213  * read one key from user defined input function
 214  */
 215 static int
 216 /*ARGSUSED*/
 217 _getc_function(EditLine *el __attribute__((__unused__)), char *c)
 218 {
 219         int i;
 220
 221         i = (*rl_getc_function)(NULL);
 222         if (i == -1)
 223                 return 0;
 224         *c = (char)i;
 225         return 1;
 226 }
 227
 228 static void
 229 _resize_fun(EditLine *el, void *a)
 230 {
 231         const LineInfo *li;
 232         char **ap = a;
 233
 234         li = el_line(el);
 235         /* a cheesy way to get rid of const cast. */
 236         *ap = memchr(li->buffer, *li->buffer, (size_t)1);
 237 }
 238
 239 static const char *
 240 _default_history_file(void)
 241 {
 242         struct passwd *p;
 243         static char *path;
 244         size_t len;
 245
 246         if (path)
 247                 return path;
 248
 249         if ((p = getpwuid(getuid())) == NULL)
 250                 return NULL;
 251
 252         len = strlen(p->pw_dir) + sizeof("/.history");
 253         if ((path = malloc(len)) == NULL)
 254                 return NULL;
 255
 256         (void)snprintf(path, len, "%s/.history", p->pw_dir);
 257         return path;
 258 }
 259
 260 /*
 261  * READLINE compatibility stuff
 262  */
 263
 264 /*
 265  * Set the prompt
 266  */
 267 int
 268 rl_set_prompt(const char *prompt)
 269 {
 270         char *p;
 271
 272         if (!prompt)
 273                 prompt = "";
 274         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 275                 return 0;
 276         if (rl_prompt)
 277                 el_free(rl_prompt);
 278         rl_prompt = strdup(prompt);
 279         if (rl_prompt == NULL)
 280                 return -1;
 281
 282         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 283                 *p = RL_PROMPT_START_IGNORE;
 284
 285         return 0;
 286 }
 287
 288 /*
 289  * initialize rl compat stuff
 290  */
 291 int
 292 rl_initialize(void)
 293 {
 294         HistEvent ev;
 295         int editmode = 1;
 296         struct termios t;
 297
 298         if (e != NULL)
 299                 el_end(e);
 300         if (h != NULL)
 301                 history_end(h);
 302
 303         if (!rl_instream)
 304                 rl_instream = stdin;
 305         if (!rl_outstream)
 306                 rl_outstream = stdout;
 307
 308         /*
 309          * See if we don't really want to run the editor
 310          */
 311         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 312                 editmode = 0;
 313
 314         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 315
 316         if (!editmode)
 317                 el_set(e, EL_EDITMODE, 0);
 318
 319         h = history_init();
 320         if (!e || !h)
 321                 return -1;
 322
 323         history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
 324         history_length = 0;
 325         max_input_history = INT_MAX;
 326         el_set(e, EL_HIST, history, h);
 327
 328         /* Setup resize function */
 329         el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
 330
 331         /* setup getc function if valid */
 332         if (rl_getc_function)
 333                 el_set(e, EL_GETCFN, _getc_function);
 334
 335         /* for proper prompt printing in readline() */
 336         if (rl_set_prompt("") == -1) {
 337                 history_end(h);
 338                 el_end(e);
 339                 return -1;
 340         }
 341         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 342         el_set(e, EL_SIGNAL, rl_catch_signals);
 343
 344         /* set default mode to "emacs"-style and read setting afterwards */
 345         /* so this can be overridden */
 346         el_set(e, EL_EDITOR, "emacs");
 347         if (rl_terminal_name != NULL)
 348                 el_set(e, EL_TERMINAL, rl_terminal_name);
 349         else
 350                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 351
 352         /*
 353          * Word completion - this has to go AFTER rebinding keys
 354          * to emacs-style.
 355          */
 356         el_set(e, EL_ADDFN, "rl_complete",
 357             "ReadLine compatible completion function",
 358             _el_rl_complete);
 359         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 360
 361         /*
 362          * Send TSTP when ^Z is pressed.
 363          */
 364         el_set(e, EL_ADDFN, "rl_tstp",
 365             "ReadLine compatible suspend function",
 366             _el_rl_tstp);
 367         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 368
 369         /*
 370          * Set some readline compatible key-bindings.
 371          */
 372         el_set(e, EL_BIND, "^R", "em-inc-search-prev", NULL);
 373
 374         /*
 375          * Allow the use of Home/End keys.
 376          */
 377         el_set(e, EL_BIND, "\\e[1~", "ed-move-to-beg", NULL);
 378         el_set(e, EL_BIND, "\\e[4~", "ed-move-to-end", NULL);
 379         el_set(e, EL_BIND, "\\e[7~", "ed-move-to-beg", NULL);
 380         el_set(e, EL_BIND, "\\e[8~", "ed-move-to-end", NULL);
 381         el_set(e, EL_BIND, "\\e[H", "ed-move-to-beg", NULL);
 382         el_set(e, EL_BIND, "\\e[F", "ed-move-to-end", NULL);
 383
 384         /*
 385          * Allow the use of the Delete/Insert keys.
 386          */
 387         el_set(e, EL_BIND, "\\e[3~", "ed-delete-next-char", NULL);
 388         el_set(e, EL_BIND, "\\e[2~", "ed-quoted-insert", NULL);
 389
 390         /*
 391          * Ctrl-left-arrow and Ctrl-right-arrow for word moving.
 392          */
 393         el_set(e, EL_BIND, "\\e[1;5C", "em-next-word", NULL);
 394         el_set(e, EL_BIND, "\\e[1;5D", "ed-prev-word", NULL);
 395         el_set(e, EL_BIND, "\\e[5C", "em-next-word", NULL);
 396         el_set(e, EL_BIND, "\\e[5D", "ed-prev-word", NULL);
 397         el_set(e, EL_BIND, "\\e\\e[C", "em-next-word", NULL);
 398         el_set(e, EL_BIND, "\\e\\e[D", "ed-prev-word", NULL);
 399
 400         /* read settings from configuration file */
 401         el_source(e, NULL);
 402
 403         /*
 404          * Unfortunately, some applications really do use rl_point
 405          * and rl_line_buffer directly.
 406          */
 407         _resize_fun(e, &rl_line_buffer);
 408         _rl_update_pos();
 409
 410         if (rl_startup_hook)
 411                 (*rl_startup_hook)(NULL, 0);
 412
 413         return 0;
 414 }
 415
 416
 417 /*
 418  * read one line from input stream and return it, chomping
 419  * trailing newline (if there is any)
 420  */
 421 char *
 422 readline(const char *p)
 423 {
 424         HistEvent ev;
 425         const char * volatile prompt = p;
 426         int count;
 427         const char *ret;
 428         char *buf;
 429         static int used_event_hook;
 430
 431         if (e == NULL || h == NULL)
 432                 rl_initialize();
 433
 434         rl_done = 0;
 435
 436         (void)setjmp(topbuf);
 437
 438         /* update prompt accordingly to what has been passed */
 439         if (rl_set_prompt(prompt) == -1)
 440                 return NULL;
 441
 442         if (rl_pre_input_hook)
 443                 (*rl_pre_input_hook)(NULL, 0);
 444
 445         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 446                 el_set(e, EL_GETCFN, _rl_event_read_char);
 447                 used_event_hook = 1;
 448         }
 449
 450         if (!rl_event_hook && used_event_hook) {
 451                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 452                 used_event_hook = 0;
 453         }
 454
 455         rl_already_prompted = 0;
 456
 457         /* get one line from input stream */
 458         ret = el_gets(e, &count);
 459
 460         if (ret && count > 0) {
 461                 int lastidx;
 462
 463                 buf = strdup(ret);
 464                 if (buf == NULL)
 465                         return NULL;
 466                 lastidx = count - 1;
 467                 if (buf[lastidx] == '\n')
 468                         buf[lastidx] = '\0';
 469         } else
 470                 buf = NULL;
 471
 472         history(h, &ev, H_GETSIZE);
 473         history_length = ev.num;
 474
 475         return buf;
 476 }
 477
 478 /*
 479  * history functions
 480  */
 481
 482 /*
 483  * is normally called before application starts to use
 484  * history expansion functions
 485  */
 486 void
 487 using_history(void)
 488 {
 489         if (h == NULL || e == NULL)
 490                 rl_initialize();
 491 }
 492
 493
 494 /*
 495  * substitute ``what'' with ``with'', returning resulting string; if
 496  * globally == 1, substitutes all occurrences of what, otherwise only the
 497  * first one
 498  */
 499 static char *
 500 _rl_compat_sub(const char *str, const char *what, const char *with,
 501     int globally)
 502 {
 503         const   char    *s;
 504         char    *r, *result;
 505         size_t  len, with_len, what_len;
 506
 507         len = strlen(str);
 508         with_len = strlen(with);
 509         what_len = strlen(what);
 510
 511         /* calculate length we need for result */
 512         s = str;
 513         while (*s) {
 514                 if (*s == *what && !strncmp(s, what, what_len)) {
 515                         len += with_len - what_len;
 516                         if (!globally)
 517                                 break;
 518                         s += what_len;
 519                 } else
 520                         s++;
 521         }
 522         r = result = el_malloc((len + 1) * sizeof(*r));
 523         if (result == NULL)
 524                 return NULL;
 525         s = str;
 526         while (*s) {
 527                 if (*s == *what && !strncmp(s, what, what_len)) {
 528                         (void)strncpy(r, with, with_len);
 529                         r += with_len;
 530                         s += what_len;
 531                         if (!globally) {
 532                                 (void)strcpy(r, s);
 533                                 return result;
 534                         }
 535                 } else
 536                         *r++ = *s++;
 537         }
 538         *r = '\0';
 539         return result;
 540 }
 541
 542 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 543 static  char    *last_search_match;     /* last !?pat[?] that matched */
 544
 545 const char *
 546 get_history_event(const char *cmd, int *cindex, int qchar)
 547 {
 548         int idx, sign, sub, num, begin, ret;
 549         size_t len;
 550         char    *pat;
 551         const char *rptr;
 552         HistEvent ev;
 553
 554         idx = *cindex;
 555         if (cmd[idx++] != history_expansion_char)
 556                 return NULL;
 557
 558         /* find out which event to take */
 559         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 560                 if (history(h, &ev, H_FIRST) != 0)
 561                         return NULL;
 562                 *cindex = cmd[idx]? (idx + 1):idx;
 563                 return ev.str;
 564         }
 565         sign = 0;
 566         if (cmd[idx] == '-') {
 567                 sign = 1;
 568                 idx++;
 569         }
 570
 571         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 572                 HIST_ENTRY *rl_he;
 573
 574                 num = 0;
 575                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 576                         num = num * 10 + cmd[idx] - '0';
 577                         idx++;
 578                 }
 579                 if (sign)
 580                         num = history_length - num + 1;
 581
 582                 if (!(rl_he = history_get(num)))
 583                         return NULL;
 584
 585                 *cindex = idx;
 586                 return rl_he->line;
 587         }
 588         sub = 0;
 589         if (cmd[idx] == '?') {
 590                 sub = 1;
 591                 idx++;
 592         }
 593         begin = idx;
 594         while (cmd[idx]) {
 595                 if (cmd[idx] == '\n')
 596                         break;
 597                 if (sub && cmd[idx] == '?')
 598                         break;
 599                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 600                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 601                         break;
 602                 idx++;
 603         }
 604         len = (size_t)idx - (size_t)begin;
 605         if (sub && cmd[idx] == '?')
 606                 idx++;
 607         if (sub && len == 0 && last_search_pat && *last_search_pat)
 608                 pat = last_search_pat;
 609         else if (len == 0)
 610                 return NULL;
 611         else {
 612                 if ((pat = el_malloc((len + 1) * sizeof(*pat))) == NULL)
 613                         return NULL;
 614                 (void)strncpy(pat, cmd + begin, len);
 615                 pat[len] = '\0';
 616         }
 617
 618         if (history(h, &ev, H_CURR) != 0) {
 619                 if (pat != last_search_pat)
 620                         el_free(pat);
 621                 return NULL;
 622         }
 623         num = ev.num;
 624
 625         if (sub) {
 626                 if (pat != last_search_pat) {
 627                         if (last_search_pat)
 628                                 el_free(last_search_pat);
 629                         last_search_pat = pat;
 630                 }
 631                 ret = history_search(pat, -1);
 632         } else
 633                 ret = history_search_prefix(pat, -1);
 634
 635         if (ret == -1) {
 636                 /* restore to end of list on failed search */
 637                 history(h, &ev, H_FIRST);
 638                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 639                 if (pat != last_search_pat)
 640                         el_free(pat);
 641                 return NULL;
 642         }
 643
 644         if (sub && len) {
 645                 if (last_search_match && last_search_match != pat)
 646                         el_free(last_search_match);
 647                 last_search_match = pat;
 648         }
 649
 650         if (pat != last_search_pat)
 651                 el_free(pat);
 652
 653         if (history(h, &ev, H_CURR) != 0)
 654                 return NULL;
 655         *cindex = idx;
 656         rptr = ev.str;
 657
 658         /* roll back to original position */
 659         (void)history(h, &ev, H_SET, num);
 660
 661         return rptr;
 662 }
 663
 664 /*
 665  * the real function doing history expansion - takes as argument command
 666  * to do and data upon which the command should be executed
 667  * does expansion the way I've understood readline documentation
 668  *
 669  * returns 0 if data was not modified, 1 if it was and 2 if the string
 670  * should be only printed and not executed; in case of error,
 671  * returns -1 and *result points to NULL
 672  * it's the caller's responsibility to free() the string returned in *result
 673  */
 674 static int
 675 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 676     char **result)
 677 {
 678         char *tmp, *search = NULL, *aptr;
 679         const char *ptr, *cmd;
 680         static char *from = NULL, *to = NULL;
 681         int start, end, idx, has_mods = 0;
 682         int p_on = 0, g_on = 0;
 683
 684         *result = NULL;
 685         aptr = NULL;
 686         ptr = NULL;
 687
 688         /* First get event specifier */
 689         idx = 0;
 690
 691         if (strchr(":^*$", command[offs + 1])) {
 692                 char str[4];
 693                 /*
 694                 * "!:" is shorthand for "!!:".
 695                 * "!^", "!*" and "!$" are shorthand for
 696                 * "!!:^", "!!:*" and "!!:$" respectively.
 697                 */
 698                 str[0] = str[1] = '!';
 699                 str[2] = '0';
 700                 ptr = get_history_event(str, &idx, 0);
 701                 idx = (command[offs + 1] == ':')? 1:0;
 702                 has_mods = 1;
 703         } else {
 704                 if (command[offs + 1] == '#') {
 705                         /* use command so far */
 706                         if ((aptr = el_malloc((offs + 1) * sizeof(*aptr)))
 707                             == NULL)
 708                                 return -1;
 709                         (void)strncpy(aptr, command, offs);
 710                         aptr[offs] = '\0';
 711                         idx = 1;
 712                 } else {
 713                         int     qchar;
 714
 715                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 716                         ptr = get_history_event(command + offs, &idx, qchar);
 717                 }
 718                 has_mods = command[offs + (size_t)idx] == ':';
 719         }
 720
 721         if (ptr == NULL && aptr == NULL)
 722                 return -1;
 723
 724         if (!has_mods) {
 725                 *result = strdup(aptr ? aptr : ptr);
 726                 if (aptr)
 727                         el_free(aptr);
 728                 if (*result == NULL)
 729                         return -1;
 730                 return 1;
 731         }
 732
 733         cmd = command + offs + idx + 1;
 734
 735         /* Now parse any word designators */
 736
 737         if (*cmd == '%')        /* last word matched by ?pat? */
 738                 tmp = strdup(last_search_match? last_search_match:"");
 739         else if (strchr("^*$-0123456789", *cmd)) {
 740                 start = end = -1;
 741                 if (*cmd == '^')
 742                         start = end = 1, cmd++;
 743                 else if (*cmd == '$')
 744                         start = -1, cmd++;
 745                 else if (*cmd == '*')
 746                         start = 1, cmd++;
 747                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 748                         start = 0;
 749                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 750                                 start = start * 10 + *cmd++ - '0';
 751
 752                         if (*cmd == '-') {
 753                                 if (isdigit((unsigned char) cmd[1])) {
 754                                         cmd++;
 755                                         end = 0;
 756                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 757                                                 end = end * 10 + *cmd++ - '0';
 758                                 } else if (cmd[1] == '$') {
 759                                         cmd += 2;
 760                                         end = -1;
 761                                 } else {
 762                                         cmd++;
 763                                         end = -2;
 764                                 }
 765                         } else if (*cmd == '*')
 766                                 end = -1, cmd++;
 767                         else
 768                                 end = start;
 769                 }
 770                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 771                 if (tmp == NULL) {
 772                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 773                             command + offs + idx);
 774                         if (aptr)
 775                                 el_free(aptr);
 776                         return -1;
 777                 }
 778         } else
 779                 tmp = strdup(aptr? aptr:ptr);
 780
 781         if (aptr)
 782                 el_free(aptr);
 783
 784         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 785                 *result = tmp;
 786                 return 1;
 787         }
 788
 789         for (; *cmd; cmd++) {
 790                 if (*cmd == ':')
 791                         continue;
 792                 else if (*cmd == 'h') {         /* remove trailing path */
 793                         if ((aptr = strrchr(tmp, '/')) != NULL)
 794                                 *aptr = '\0';
 795                 } else if (*cmd == 't') {       /* remove leading path */
 796                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 797                                 aptr = strdup(aptr + 1);
 798                                 el_free(tmp);
 799                                 tmp = aptr;
 800                         }
 801                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 802                         if ((aptr = strrchr(tmp, '.')) != NULL)
 803                                 *aptr = '\0';
 804                 } else if (*cmd == 'e') {       /* remove all but suffix */
 805                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 806                                 aptr = strdup(aptr);
 807                                 el_free(tmp);
 808                                 tmp = aptr;
 809                         }
 810                 } else if (*cmd == 'p')         /* print only */
 811                         p_on = 1;
 812                 else if (*cmd == 'g')
 813                         g_on = 2;
 814                 else if (*cmd == 's' || *cmd == '&') {
 815                         char *what, *with, delim;
 816                         size_t len, from_len;
 817                         size_t size;
 818
 819                         if (*cmd == '&' && (from == NULL || to == NULL))
 820                                 continue;
 821                         else if (*cmd == 's') {
 822                                 delim = *(++cmd), cmd++;
 823                                 size = 16;
 824                                 what = el_realloc(from, size * sizeof(*what));
 825                                 if (what == NULL) {
 826                                         el_free(from);
 827                                         el_free(tmp);
 828                                         return 0;
 829                                 }
 830                                 len = 0;
 831                                 for (; *cmd && *cmd != delim; cmd++) {
 832                                         if (*cmd == '\\' && cmd[1] == delim)
 833                                                 cmd++;
 834                                         if (len >= size) {
 835                                                 char *nwhat;
 836                                                 nwhat = el_realloc(what,
 837                                                     (size <<= 1) *
 838                                                     sizeof(*nwhat));
 839                                                 if (nwhat == NULL) {
 840                                                         el_free(what);
 841                                                         el_free(tmp);
 842                                                         return 0;
 843                                                 }
 844                                                 what = nwhat;
 845                                         }
 846                                         what[len++] = *cmd;
 847                                 }
 848                                 what[len] = '\0';
 849                                 from = what;
 850                                 if (*what == '\0') {
 851                                         el_free(what);
 852                                         if (search) {
 853                                                 from = strdup(search);
 854                                                 if (from == NULL) {
 855                                                         el_free(tmp);
 856                                                         return 0;
 857                                                 }
 858                                         } else {
 859                                                 from = NULL;
 860                                                 el_free(tmp);
 861                                                 return -1;
 862                                         }
 863                                 }
 864                                 cmd++;  /* shift after delim */
 865                                 if (!*cmd)
 866                                         continue;
 867
 868                                 size = 16;
 869                                 with = el_realloc(to, size * sizeof(*with));
 870                                 if (with == NULL) {
 871                                         el_free(to);
 872                                         el_free(tmp);
 873                                         return -1;
 874                                 }
 875                                 len = 0;
 876                                 from_len = strlen(from);
 877                                 for (; *cmd && *cmd != delim; cmd++) {
 878                                         if (len + from_len + 1 >= size) {
 879                                                 char *nwith;
 880                                                 size += from_len + 1;
 881                                                 nwith = el_realloc(with,
 882                                                     size * sizeof(*nwith));
 883                                                 if (nwith == NULL) {
 884                                                         el_free(with);
 885                                                         el_free(tmp);
 886                                                         return -1;
 887                                                 }
 888                                                 with = nwith;
 889                                         }
 890                                         if (*cmd == '&') {
 891                                                 /* safe */
 892                                                 (void)strcpy(&with[len], from);
 893                                                 len += from_len;
 894                                                 continue;
 895                                         }
 896                                         if (*cmd == '\\'
 897                                             && (*(cmd + 1) == delim
 898                                                 || *(cmd + 1) == '&'))
 899                                                 cmd++;
 900                                         with[len++] = *cmd;
 901                                 }
 902                                 with[len] = '\0';
 903                                 to = with;
 904                         }
 905
 906                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 907                         if (aptr) {
 908                                 el_free(tmp);
 909                                 tmp = aptr;
 910                         }
 911                         g_on = 0;
 912                 }
 913         }
 914         *result = tmp;
 915         return p_on? 2:1;
 916 }
 917
 918
 919 /*
 920  * csh-style history expansion
 921  */
 922 int
 923 history_expand(char *str, char **output)
 924 {
 925         int ret = 0;
 926         size_t idx, i, size;
 927         char *tmp, *result;
 928
 929         if (h == NULL || e == NULL)
 930                 rl_initialize();
 931
 932         if (history_expansion_char == 0) {
 933                 *output = strdup(str);
 934                 return 0;
 935         }
 936
 937         *output = NULL;
 938         if (str[0] == history_subst_char) {
 939                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 940                 *output = el_malloc((strlen(str) + 4 + 1) * sizeof(**output));
 941                 if (*output == NULL)
 942                         return 0;
 943                 (*output)[0] = (*output)[1] = history_expansion_char;
 944                 (*output)[2] = ':';
 945                 (*output)[3] = 's';
 946                 (void)strcpy((*output) + 4, str);
 947                 str = *output;
 948         } else {
 949                 *output = strdup(str);
 950                 if (*output == NULL)
 951                         return 0;
 952         }
 953
 954 #define ADD_STRING(what, len, fr)                                       \
 955         {                                                               \
 956                 if (idx + len + 1 > size) {                             \
 957                         char *nresult = el_realloc(result,              \
 958                             (size += len + 1) * sizeof(*nresult));      \
 959                         if (nresult == NULL) {                          \
 960                                 el_free(*output);                       \
 961                                 if (/*CONSTCOND*/fr)                    \
 962                                         el_free(tmp);                   \
 963                                 return 0;                               \
 964                         }                                               \
 965                         result = nresult;                               \
 966                 }                                                       \
 967                 (void)strncpy(&result[idx], what, len);                 \
 968                 idx += len;                                             \
 969                 result[idx] = '\0';                                     \
 970         }
 971
 972         result = NULL;
 973         size = idx = 0;
 974         tmp = NULL;
 975         for (i = 0; str[i];) {
 976                 int qchar, loop_again;
 977                 size_t len, start, j;
 978
 979                 qchar = 0;
 980                 loop_again = 1;
 981                 start = j = i;
 982 loop:
 983                 for (; str[j]; j++) {
 984                         if (str[j] == '\\' &&
 985                             str[j + 1] == history_expansion_char) {
 986                                 (void)strcpy(&str[j], &str[j + 1]);
 987                                 continue;
 988                         }
 989                         if (!loop_again) {
 990                                 if (isspace((unsigned char) str[j])
 991                                     || str[j] == qchar)
 992                                         break;
 993                         }
 994                         if (str[j] == history_expansion_char
 995                             && !strchr(history_no_expand_chars, str[j + 1])
 996                             && (!history_inhibit_expansion_function ||
 997                             (*history_inhibit_expansion_function)(str,
 998                             (int)j) == 0))
 999                                 break;
1000                 }
1001
1002                 if (str[j] && loop_again) {
1003                         i = j;
1004                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
1005                         j++;
1006                         if (str[j] == history_expansion_char)
1007                                 j++;
1008                         loop_again = 0;
1009                         goto loop;
1010                 }
1011                 len = i - start;
1012                 ADD_STRING(&str[start], len, 0);
1013
1014                 if (str[i] == '\0' || str[i] != history_expansion_char) {
1015                         len = j - i;
1016                         ADD_STRING(&str[i], len, 0);
1017                         if (start == 0)
1018                                 ret = 0;
1019                         else
1020                                 ret = 1;
1021                         break;
1022                 }
1023                 ret = _history_expand_command (str, i, (j - i), &tmp);
1024                 if (ret > 0 && tmp) {
1025                         len = strlen(tmp);
1026                         ADD_STRING(tmp, len, 1);
1027                 }
1028                 if (tmp) {
1029                         el_free(tmp);
1030                         tmp = NULL;
1031                 }
1032                 i = j;
1033         }
1034
1035         /* ret is 2 for "print only" option */
1036         if (ret == 2) {
1037                 add_history(result);
1038 #ifdef GDB_411_HACK
1039                 /* gdb 4.11 has been shipped with readline, where */
1040                 /* history_expand() returned -1 when the line     */
1041                 /* should not be executed; in readline 2.1+       */
1042                 /* it should return 2 in such a case              */
1043                 ret = -1;
1044 #endif
1045         }
1046         el_free(*output);
1047         *output = result;
1048
1049         return ret;
1050 }
1051
1052 /*
1053 * Return a string consisting of arguments of "str" from "start" to "end".
1054 */
1055 char *
1056 history_arg_extract(int start, int end, const char *str)
1057 {
1058         size_t  i, len, max;
1059         char    **arr, *result = NULL;
1060
1061         arr = history_tokenize(str);
1062         if (!arr)
1063                 return NULL;
1064         if (arr && *arr == NULL)
1065                 goto out;
1066
1067         for (max = 0; arr[max]; max++)
1068                 continue;
1069         max--;
1070
1071         if (start == '$')
1072                 start = (int)max;
1073         if (end == '$')
1074                 end = (int)max;
1075         if (end < 0)
1076                 end = (int)max + end + 1;
1077         if (start < 0)
1078                 start = end;
1079
1080         if (start < 0 || end < 0 || (size_t)start > max ||
1081             (size_t)end > max || start > end)
1082                 goto out;
1083
1084         for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1085                 len += strlen(arr[i]) + 1;
1086         len++;
1087         result = el_malloc(len * sizeof(*result));
1088         if (result == NULL)
1089                 goto out;
1090
1091         for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1092                 (void)strcpy(result + len, arr[i]);
1093                 len += strlen(arr[i]);
1094                 if (i < (size_t)end)
1095                         result[len++] = ' ';
1096         }
1097         result[len] = '\0';
1098
1099 out:
1100         for (i = 0; arr[i]; i++)
1101                 el_free(arr[i]);
1102         el_free(arr);
1103
1104         return result;
1105 }
1106
1107 /*
1108  * Parse the string into individual tokens,
1109  * similar to how shell would do it.
1110  */
1111 char **
1112 history_tokenize(const char *str)
1113 {
1114         int size = 1, idx = 0, i, start;
1115         size_t len;
1116         char **result = NULL, *temp, delim = '\0';
1117
1118         for (i = 0; str[i];) {
1119                 while (isspace((unsigned char) str[i]))
1120                         i++;
1121                 start = i;
1122                 for (; str[i];) {
1123                         if (str[i] == '\\') {
1124                                 if (str[i+1] != '\0')
1125                                         i++;
1126                         } else if (str[i] == delim)
1127                                 delim = '\0';
1128                         else if (!delim &&
1129                                     (isspace((unsigned char) str[i]) ||
1130                                 strchr("()<>;&|$", str[i])))
1131                                 break;
1132                         else if (!delim && strchr("'`\"", str[i]))
1133                                 delim = str[i];
1134                         if (str[i])
1135                                 i++;
1136                 }
1137
1138                 if (idx + 2 >= size) {
1139                         char **nresult;
1140                         size <<= 1;
1141                         nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1142                         if (nresult == NULL) {
1143                                 el_free(result);
1144                                 return NULL;
1145                         }
1146                         result = nresult;
1147                 }
1148                 len = (size_t)i - (size_t)start;
1149                 temp = el_malloc((size_t)(len + 1) * sizeof(*temp));
1150                 if (temp == NULL) {
1151                         for (i = 0; i < idx; i++)
1152                                 el_free(result[i]);
1153                         el_free(result);
1154                         return NULL;
1155                 }
1156                 (void)strncpy(temp, &str[start], len);
1157                 temp[len] = '\0';
1158                 result[idx++] = temp;
1159                 result[idx] = NULL;
1160                 if (str[i])
1161                         i++;
1162         }
1163         return result;
1164 }
1165
1166
1167 /*
1168  * limit size of history record to ``max'' events
1169  */
1170 void
1171 stifle_history(int max)
1172 {
1173         HistEvent ev;
1174
1175         if (h == NULL || e == NULL)
1176                 rl_initialize();
1177
1178         if (history(h, &ev, H_SETSIZE, max) == 0)
1179                 max_input_history = max;
1180 }
1181
1182
1183 /*
1184  * "unlimit" size of history - set the limit to maximum allowed int value
1185  */
1186 int
1187 unstifle_history(void)
1188 {
1189         HistEvent ev;
1190         int omax;
1191
1192         history(h, &ev, H_SETSIZE, INT_MAX);
1193         omax = max_input_history;
1194         max_input_history = INT_MAX;
1195         return omax;            /* some value _must_ be returned */
1196 }
1197
1198
1199 int
1200 history_is_stifled(void)
1201 {
1202
1203         /* cannot return true answer */
1204         return max_input_history != INT_MAX;
1205 }
1206
1207 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1208
1209 int
1210 history_truncate_file (const char *filename, int nlines)
1211 {
1212         int ret = 0;
1213         FILE *fp, *tp;
1214         char template[sizeof(_history_tmp_template)];
1215         char buf[4096];
1216         int fd;
1217         char *cp;
1218         off_t off;
1219         int count = 0;
1220         ssize_t left = 0;
1221
1222         if (filename == NULL && (filename = _default_history_file()) == NULL)
1223                 return errno;
1224         if ((fp = fopen(filename, "r+")) == NULL)
1225                 return errno;
1226         strcpy(template, _history_tmp_template);
1227         if ((fd = mkstemp(template)) == -1) {
1228                 ret = errno;
1229                 goto out1;
1230         }
1231
1232         if ((tp = fdopen(fd, "r+")) == NULL) {
1233                 close(fd);
1234                 ret = errno;
1235                 goto out2;
1236         }
1237
1238         for(;;) {
1239                 if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1240                         if (ferror(fp)) {
1241                                 ret = errno;
1242                                 break;
1243                         }
1244                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1245                             (off_t)-1) {
1246                                 ret = errno;
1247                                 break;
1248                         }
1249                         left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1250                         if (ferror(fp)) {
1251                                 ret = errno;
1252                                 break;
1253                         }
1254                         if (left == 0) {
1255                                 count--;
1256                                 left = sizeof(buf);
1257                         } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1258                             != 1) {
1259                                 ret = errno;
1260                                 break;
1261                         }
1262                         fflush(tp);
1263                         break;
1264                 }
1265                 if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1266                         ret = errno;
1267                         break;
1268                 }
1269                 count++;
1270         }
1271         if (ret)
1272                 goto out3;
1273         cp = buf + left - 1;
1274         if(*cp != '\n')
1275                 cp++;
1276         for(;;) {
1277                 while (--cp >= buf) {
1278                         if (*cp == '\n') {
1279                                 if (--nlines == 0) {
1280                                         if (++cp >= buf + sizeof(buf)) {
1281                                                 count++;
1282                                                 cp = buf;
1283                                         }
1284                                         break;
1285                                 }
1286                         }
1287                 }
1288                 if (nlines <= 0 || count == 0)
1289                         break;
1290                 count--;
1291                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1292                         ret = errno;
1293                         break;
1294                 }
1295                 if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1296                         if (ferror(tp)) {
1297                                 ret = errno;
1298                                 break;
1299                         }
1300                         ret = EAGAIN;
1301                         break;
1302                 }
1303                 cp = buf + sizeof(buf);
1304         }
1305
1306         if (ret || nlines > 0)
1307                 goto out3;
1308
1309         if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1310                 ret = errno;
1311                 goto out3;
1312         }
1313
1314         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1315             (off_t)-1) {
1316                 ret = errno;
1317                 goto out3;
1318         }
1319
1320         for(;;) {
1321                 if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1322                         if (ferror(fp))
1323                                 ret = errno;
1324                         break;
1325                 }
1326                 if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1327                         ret = errno;
1328                         break;
1329                 }
1330         }
1331         fflush(fp);
1332         if((off = ftello(fp)) > 0)
1333                 (void)ftruncate(fileno(fp), off);
1334 out3:
1335         fclose(tp);
1336 out2:
1337         unlink(template);
1338 out1:
1339         fclose(fp);
1340
1341         return ret;
1342 }
1343
1344
1345 /*
1346  * read history from a file given
1347  */
1348 int
1349 read_history(const char *filename)
1350 {
1351         HistEvent ev;
1352
1353         if (h == NULL || e == NULL)
1354                 rl_initialize();
1355         if (filename == NULL && (filename = _default_history_file()) == NULL)
1356                 return errno;
1357         return history(h, &ev, H_LOAD, filename) == -1 ?
1358             (errno ? errno : EINVAL) : 0;
1359 }
1360
1361
1362 /*
1363  * write history to a file given
1364  */
1365 int
1366 write_history(const char *filename)
1367 {
1368         HistEvent ev;
1369
1370         if (h == NULL || e == NULL)
1371                 rl_initialize();
1372         if (filename == NULL && (filename = _default_history_file()) == NULL)
1373                 return errno;
1374         return history(h, &ev, H_SAVE, filename) == -1 ?
1375             (errno ? errno : EINVAL) : 0;
1376 }
1377
1378
1379 /*
1380  * returns history ``num''th event
1381  *
1382  * returned pointer points to static variable
1383  */
1384 HIST_ENTRY *
1385 history_get(int num)
1386 {
1387         static HIST_ENTRY she;
1388         HistEvent ev;
1389         int curr_num;
1390
1391         if (h == NULL || e == NULL)
1392                 rl_initialize();
1393
1394         /* save current position */
1395         if (history(h, &ev, H_CURR) != 0)
1396                 return NULL;
1397         curr_num = ev.num;
1398
1399         /* start from the oldest */
1400         if (history(h, &ev, H_LAST) != 0)
1401                 return NULL;    /* error */
1402
1403         /* look forwards for event matching specified offset */
1404         if (history(h, &ev, H_NEXT_EVDATA, num, &she.data))
1405                 return NULL;
1406
1407         she.line = ev.str;
1408
1409         /* restore pointer to where it was */
1410         (void)history(h, &ev, H_SET, curr_num);
1411
1412         return &she;
1413 }
1414
1415
1416 /*
1417  * add the line to history table
1418  */
1419 int
1420 add_history(const char *line)
1421 {
1422         HistEvent ev;
1423
1424         if (line == NULL)
1425                 return 0;
1426
1427         if (h == NULL || e == NULL)
1428                 rl_initialize();
1429
1430         (void)history(h, &ev, H_ENTER, line);
1431         if (history(h, &ev, H_GETSIZE) == 0)
1432                 history_length = ev.num;
1433
1434         return !(history_length > 0); /* return 0 if all is okay */
1435 }
1436
1437
1438 /*
1439  * remove the specified entry from the history list and return it.
1440  */
1441 HIST_ENTRY *
1442 remove_history(int num)
1443 {
1444         HIST_ENTRY *he;
1445         HistEvent ev;
1446
1447         if (h == NULL || e == NULL)
1448                 rl_initialize();
1449
1450         if ((he = el_malloc(sizeof(*he))) == NULL)
1451                 return NULL;
1452
1453         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1454                 el_free(he);
1455                 return NULL;
1456         }
1457
1458         he->line = ev.str;
1459         if (history(h, &ev, H_GETSIZE) == 0)
1460                 history_length = ev.num;
1461
1462         return he;
1463 }
1464
1465
1466 /*
1467  * replace the line and data of the num-th entry
1468  */
1469 HIST_ENTRY *
1470 replace_history_entry(int num, const char *line, histdata_t data)
1471 {
1472         HIST_ENTRY *he;
1473         HistEvent ev;
1474         int curr_num;
1475
1476         if (h == NULL || e == NULL)
1477                 rl_initialize();
1478
1479         /* save current position */
1480         if (history(h, &ev, H_CURR) != 0)
1481                 return NULL;
1482         curr_num = ev.num;
1483
1484         /* start from the oldest */
1485         if (history(h, &ev, H_LAST) != 0)
1486                 return NULL;    /* error */
1487
1488         if ((he = el_malloc(sizeof(*he))) == NULL)
1489                 return NULL;
1490
1491         /* look forwards for event matching specified offset */
1492         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1493                 goto out;
1494
1495         he->line = strdup(ev.str);
1496         if (he->line == NULL)
1497                 goto out;
1498
1499         if (history(h, &ev, H_REPLACE, line, data))
1500                 goto out;
1501
1502         /* restore pointer to where it was */
1503         if (history(h, &ev, H_SET, curr_num))
1504                 goto out;
1505
1506         return he;
1507 out:
1508         el_free(he);
1509         return NULL;
1510 }
1511
1512 /*
1513  * clear the history list - delete all entries
1514  */
1515 void
1516 clear_history(void)
1517 {
1518         HistEvent ev;
1519
1520         if (h == NULL || e == NULL)
1521                 rl_initialize();
1522
1523         (void)history(h, &ev, H_CLEAR);
1524         history_length = 0;
1525 }
1526
1527
1528 /*
1529  * returns offset of the current history event
1530  */
1531 int
1532 where_history(void)
1533 {
1534         HistEvent ev;
1535         int curr_num, off;
1536
1537         if (history(h, &ev, H_CURR) != 0)
1538                 return 0;
1539         curr_num = ev.num;
1540
1541         (void)history(h, &ev, H_FIRST);
1542         off = 1;
1543         while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1544                 off++;
1545
1546         return off;
1547 }
1548
1549
1550 /*
1551  * returns current history event or NULL if there is no such event
1552  */
1553 HIST_ENTRY *
1554 current_history(void)
1555 {
1556
1557         return _move_history(H_CURR);
1558 }
1559
1560
1561 /*
1562  * returns total number of bytes history events' data are using
1563  */
1564 int
1565 history_total_bytes(void)
1566 {
1567         HistEvent ev;
1568         int curr_num;
1569         size_t size;
1570
1571         if (history(h, &ev, H_CURR) != 0)
1572                 return -1;
1573         curr_num = ev.num;
1574
1575         (void)history(h, &ev, H_FIRST);
1576         size = 0;
1577         do
1578                 size += strlen(ev.str) * sizeof(*ev.str);
1579         while (history(h, &ev, H_NEXT) == 0);
1580
1581         /* get to the same position as before */
1582         history(h, &ev, H_PREV_EVENT, curr_num);
1583
1584         return (int)size;
1585 }
1586
1587
1588 /*
1589  * sets the position in the history list to ``pos''
1590  */
1591 int
1592 history_set_pos(int pos)
1593 {
1594         HistEvent ev;
1595         int curr_num;
1596
1597         if (pos >= history_length || pos < 0)
1598                 return -1;
1599
1600         (void)history(h, &ev, H_CURR);
1601         curr_num = ev.num;
1602
1603         /*
1604          * use H_DELDATA to set to nth history (without delete) by passing
1605          * (void **)-1
1606          */
1607         if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1608                 (void)history(h, &ev, H_SET, curr_num);
1609                 return -1;
1610         }
1611         return 0;
1612 }
1613
1614
1615 /*
1616  * returns previous event in history and shifts pointer accordingly
1617  */
1618 HIST_ENTRY *
1619 previous_history(void)
1620 {
1621
1622         return _move_history(H_PREV);
1623 }
1624
1625
1626 /*
1627  * returns next event in history and shifts pointer accordingly
1628  */
1629 HIST_ENTRY *
1630 next_history(void)
1631 {
1632
1633         return _move_history(H_NEXT);
1634 }
1635
1636
1637 /*
1638  * searches for first history event containing the str
1639  */
1640 int
1641 history_search(const char *str, int direction)
1642 {
1643         HistEvent ev;
1644         const char *strp;
1645         int curr_num;
1646
1647         if (history(h, &ev, H_CURR) != 0)
1648                 return -1;
1649         curr_num = ev.num;
1650
1651         for (;;) {
1652                 if ((strp = strstr(ev.str, str)) != NULL)
1653                         return (int)(strp - ev.str);
1654                 if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1655                         break;
1656         }
1657         (void)history(h, &ev, H_SET, curr_num);
1658         return -1;
1659 }
1660
1661
1662 /*
1663  * searches for first history event beginning with str
1664  */
1665 int
1666 history_search_prefix(const char *str, int direction)
1667 {
1668         HistEvent ev;
1669
1670         return (history(h, &ev, direction < 0 ?
1671             H_PREV_STR : H_NEXT_STR, str));
1672 }
1673
1674
1675 /*
1676  * search for event in history containing str, starting at offset
1677  * abs(pos); continue backward, if pos<0, forward otherwise
1678  */
1679 /* ARGSUSED */
1680 int
1681 history_search_pos(const char *str,
1682                    int direction __attribute__((__unused__)), int pos)
1683 {
1684         HistEvent ev;
1685         int curr_num, off;
1686
1687         off = (pos > 0) ? pos : -pos;
1688         pos = (pos > 0) ? 1 : -1;
1689
1690         if (history(h, &ev, H_CURR) != 0)
1691                 return -1;
1692         curr_num = ev.num;
1693
1694         if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1695                 return -1;
1696
1697         for (;;) {
1698                 if (strstr(ev.str, str))
1699                         return off;
1700                 if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1701                         break;
1702         }
1703
1704         /* set "current" pointer back to previous state */
1705         (void)history(h, &ev,
1706             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1707
1708         return -1;
1709 }
1710
1711
1712 /********************************/
1713 /* completion functions */
1714
1715 char *
1716 tilde_expand(char *name)
1717 {
1718         return fn_tilde_expand(name);
1719 }
1720
1721 char *
1722 filename_completion_function(const char *name, int state)
1723 {
1724         return fn_filename_completion_function(name, state);
1725 }
1726
1727 /*
1728  * a completion generator for usernames; returns _first_ username
1729  * which starts with supplied text
1730  * text contains a partial username preceded by random character
1731  * (usually '~'); state resets search from start (??? should we do that anyway)
1732  * it's the caller's responsibility to free the returned value
1733  */
1734 char *
1735 username_completion_function(const char *text, int state)
1736 {
1737         struct passwd *pass = NULL;
1738
1739         if (text[0] == '\0')
1740                 return NULL;
1741
1742         if (*text == '~')
1743                 text++;
1744
1745         if (state == 0)
1746                 setpwent();
1747
1748         while (
1749             (pass = getpwent()) != NULL
1750             && text[0] == pass->pw_name[0]
1751             && strcmp(text, pass->pw_name) == 0)
1752                 continue;
1753
1754         if (pass == NULL) {
1755                 endpwent();
1756                 return NULL;
1757         }
1758         return strdup(pass->pw_name);
1759 }
1760
1761
1762 /*
1763  * el-compatible wrapper to send TSTP on ^Z
1764  */
1765 /* ARGSUSED */
1766 static unsigned char
1767 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1768 {
1769         (void)kill(0, SIGTSTP);
1770         return CC_NORM;
1771 }
1772
1773 /*
1774  * Display list of strings in columnar format on readline's output stream.
1775  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1776  * 'max' is maximum length of string in 'matches'.
1777  */
1778 void
1779 rl_display_match_list(char **matches, int len, int max)
1780 {
1781
1782         fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1783 }
1784
1785 static const char *
1786 /*ARGSUSED*/
1787 _rl_completion_append_character_function(const char *dummy
1788     __attribute__((__unused__)))
1789 {
1790         static char buf[2];
1791         buf[0] = (char)rl_completion_append_character;
1792         buf[1] = '\0';
1793         return buf;
1794 }
1795
1796
1797 /*
1798  * complete word at current point
1799  */
1800 /* ARGSUSED */
1801 int
1802 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1803 {
1804 #ifdef WIDECHAR
1805         static ct_buffer_t wbreak_conv, sprefix_conv;
1806 #endif
1807         char *breakchars;
1808
1809         if (h == NULL || e == NULL)
1810                 rl_initialize();
1811
1812         if (rl_inhibit_completion) {
1813                 char arr[2];
1814                 arr[0] = (char)invoking_key;
1815                 arr[1] = '\0';
1816                 el_insertstr(e, arr);
1817                 return CC_REFRESH;
1818         }
1819
1820         if (rl_completion_word_break_hook != NULL)
1821                 breakchars = (*rl_completion_word_break_hook)();
1822         else
1823                 breakchars = rl_basic_word_break_characters;
1824
1825         /* Just look at how many global variables modify this operation! */
1826         return fn_complete(e,
1827             (CPFunction *)rl_completion_entry_function,
1828             rl_attempted_completion_function,
1829             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1830             ct_decode_string(breakchars, &sprefix_conv),
1831             _rl_completion_append_character_function,
1832             (size_t)rl_completion_query_items,
1833             &rl_completion_type, &rl_attempted_completion_over,
1834             &rl_point, &rl_end);
1835
1836
1837 }
1838
1839
1840 /* ARGSUSED */
1841 static unsigned char
1842 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1843 {
1844         return (unsigned char)rl_complete(0, ch);
1845 }
1846
1847 /*
1848  * misc other functions
1849  */
1850
1851 /*
1852  * bind key c to readline-type function func
1853  */
1854 int
1855 rl_bind_key(int c, rl_command_func_t *func)
1856 {
1857         int retval = -1;
1858
1859         if (h == NULL || e == NULL)
1860                 rl_initialize();
1861
1862         if (func == rl_insert) {
1863                 /* XXX notice there is no range checking of ``c'' */
1864                 e->el_map.key[c] = ED_INSERT;
1865                 retval = 0;
1866         }
1867         return retval;
1868 }
1869
1870
1871 /*
1872  * read one key from input - handles chars pushed back
1873  * to input stream also
1874  */
1875 int
1876 rl_read_key(void)
1877 {
1878         char fooarr[2 * sizeof(int)];
1879
1880         if (e == NULL || h == NULL)
1881                 rl_initialize();
1882
1883         return el_getc(e, fooarr);
1884 }
1885
1886
1887 /*
1888  * reset the terminal
1889  */
1890 /* ARGSUSED */
1891 void
1892 rl_reset_terminal(const char *p __attribute__((__unused__)))
1893 {
1894
1895         if (h == NULL || e == NULL)
1896                 rl_initialize();
1897         el_reset(e);
1898 }
1899
1900
1901 /*
1902  * insert character ``c'' back into input stream, ``count'' times
1903  */
1904 int
1905 rl_insert(int count, int c)
1906 {
1907         char arr[2];
1908
1909         if (h == NULL || e == NULL)
1910                 rl_initialize();
1911
1912         /* XXX - int -> char conversion can lose on multichars */
1913         arr[0] = (char)c;
1914         arr[1] = '\0';
1915
1916         for (; count > 0; count--)
1917                 el_push(e, arr);
1918
1919         return 0;
1920 }
1921
1922 int
1923 rl_insert_text(const char *text)
1924 {
1925         if (!text || *text == 0)
1926                 return 0;
1927
1928         if (h == NULL || e == NULL)
1929                 rl_initialize();
1930
1931         if (el_insertstr(e, text) < 0)
1932                 return 0;
1933         return (int)strlen(text);
1934 }
1935
1936 /*ARGSUSED*/
1937 int
1938 rl_newline(int count __attribute__((__unused__)),
1939     int c __attribute__((__unused__)))
1940 {
1941         /*
1942          * Readline-4.0 appears to ignore the args.
1943          */
1944         return rl_insert(1, '\n');
1945 }
1946
1947 /*ARGSUSED*/
1948 static unsigned char
1949 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
1950 {
1951         if (map[c] == NULL)
1952             return CC_ERROR;
1953
1954         _rl_update_pos();
1955
1956         (*map[c])(NULL, c);
1957
1958         /* If rl_done was set by the above call, deal with it here */
1959         if (rl_done)
1960                 return CC_EOF;
1961
1962         return CC_NORM;
1963 }
1964
1965 int
1966 rl_add_defun(const char *name, Function *fun, int c)
1967 {
1968         char dest[8];
1969         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1970                 return -1;
1971         map[(unsigned char)c] = fun;
1972         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1973         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1974         el_set(e, EL_BIND, dest, name, NULL);
1975         return 0;
1976 }
1977
1978 void
1979 rl_callback_read_char(void)
1980 {
1981         int count = 0, done = 0;
1982         const char *buf = el_gets(e, &count);
1983         char *wbuf;
1984
1985         if (buf == NULL || count-- <= 0)
1986                 return;
1987         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1988                 done = 1;
1989         if (buf[count] == '\n' || buf[count] == '\r')
1990                 done = 2;
1991
1992         if (done && rl_linefunc != NULL) {
1993                 el_set(e, EL_UNBUFFERED, 0);
1994                 if (done == 2) {
1995                     if ((wbuf = strdup(buf)) != NULL)
1996                         wbuf[count] = '\0';
1997                 } else
1998                         wbuf = NULL;
1999                 (*(void (*)(const char *))rl_linefunc)(wbuf);
2000                 el_set(e, EL_UNBUFFERED, 1);
2001         }
2002 }
2003
2004 void
2005 rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
2006 {
2007         if (e == NULL) {
2008                 rl_initialize();
2009         }
2010         (void)rl_set_prompt(prompt);
2011         rl_linefunc = linefunc;
2012         el_set(e, EL_UNBUFFERED, 1);
2013 }
2014
2015 void
2016 rl_callback_handler_remove(void)
2017 {
2018         el_set(e, EL_UNBUFFERED, 0);
2019         rl_linefunc = NULL;
2020 }
2021
2022 void
2023 rl_redisplay(void)
2024 {
2025         char a[2];
2026         a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2027         a[1] = '\0';
2028         el_push(e, a);
2029 }
2030
2031 int
2032 rl_get_previous_history(int count, int key)
2033 {
2034         char a[2];
2035         a[0] = (char)key;
2036         a[1] = '\0';
2037         while (count--)
2038                 el_push(e, a);
2039         return 0;
2040 }
2041
2042 void
2043 /*ARGSUSED*/
2044 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2045 {
2046         el_set(e, EL_PREP_TERM, 1);
2047 }
2048
2049 void
2050 rl_deprep_terminal(void)
2051 {
2052         el_set(e, EL_PREP_TERM, 0);
2053 }
2054
2055 int
2056 rl_read_init_file(const char *s)
2057 {
2058         return el_source(e, s);
2059 }
2060
2061 int
2062 rl_parse_and_bind(const char *line)
2063 {
2064         const char **argv;
2065         int argc;
2066         Tokenizer *tok;
2067
2068         tok = tok_init(NULL);
2069         tok_str(tok, line, &argc, &argv);
2070         argc = el_parse(e, argc, argv);
2071         tok_end(tok);
2072         return argc ? 1 : 0;
2073 }
2074
2075 int
2076 rl_variable_bind(const char *var, const char *value)
2077 {
2078         /*
2079          * The proper return value is undocument, but this is what the
2080          * readline source seems to do.
2081          */
2082         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2083 }
2084
2085 void
2086 rl_stuff_char(int c)
2087 {
2088         char buf[2];
2089
2090         buf[0] = (char)c;
2091         buf[1] = '\0';
2092         el_insertstr(e, buf);
2093 }
2094
2095 static int
2096 _rl_event_read_char(EditLine *el, char *cp)
2097 {
2098         int     n;
2099         ssize_t num_read = 0;
2100
2101         *cp = '\0';
2102         while (rl_event_hook) {
2103
2104                 (*rl_event_hook)();
2105
2106 #if defined(FIONREAD)
2107                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2108                         return -1;
2109                 if (n)
2110                         num_read = read(el->el_infd, cp, (size_t)1);
2111                 else
2112                         num_read = 0;
2113 #elif defined(F_SETFL) && defined(O_NDELAY)
2114                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2115                         return -1;
2116                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2117                         return -1;
2118                 num_read = read(el->el_infd, cp, 1);
2119                 if (fcntl(el->el_infd, F_SETFL, n))
2120                         return -1;
2121 #else
2122                 /* not non-blocking, but what you gonna do? */
2123                 num_read = read(el->el_infd, cp, 1);
2124                 return -1;
2125 #endif
2126
2127                 if (num_read < 0 && errno == EAGAIN)
2128                         continue;
2129                 if (num_read == 0)
2130                         continue;
2131                 break;
2132         }
2133         if (!rl_event_hook)
2134                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2135         return (int)num_read;
2136 }
2137
2138 static void
2139 _rl_update_pos(void)
2140 {
2141         const LineInfo *li = el_line(e);
2142
2143         rl_point = (int)(li->cursor - li->buffer);
2144         rl_end = (int)(li->lastchar - li->buffer);
2145 }
2146
2147 void
2148 rl_get_screen_size(int *rows, int *cols)
2149 {
2150         if (rows)
2151                 el_get(e, EL_GETTC, "li", rows, (void *)0);
2152         if (cols)
2153                 el_get(e, EL_GETTC, "co", cols, (void *)0);
2154 }
2155
2156 void
2157 rl_set_screen_size(int rows, int cols)
2158 {
2159         char buf[64];
2160         (void)snprintf(buf, sizeof(buf), "%d", rows);
2161         el_set(e, EL_SETTC, "li", buf, NULL);
2162         (void)snprintf(buf, sizeof(buf), "%d", cols);
2163         el_set(e, EL_SETTC, "co", buf, NULL);
2164 }
2165
2166 char **
2167 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2168 {
2169         size_t len, max, i, j, min;
2170         char **list, *match, *a, *b;
2171
2172         len = 1;
2173         max = 10;
2174         if ((list = el_malloc(max * sizeof(*list))) == NULL)
2175                 return NULL;
2176
2177         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2178                 list[len++] = match;
2179                 if (len == max) {
2180                         char **nl;
2181                         max += 10;
2182                         if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2183                                 goto out;
2184                         list = nl;
2185                 }
2186         }
2187         if (len == 1)
2188                 goto out;
2189         list[len] = NULL;
2190         if (len == 2) {
2191                 if ((list[0] = strdup(list[1])) == NULL)
2192                         goto out;
2193                 return list;
2194         }
2195         qsort(&list[1], len - 1, sizeof(*list),
2196             (int (*)(const void *, const void *)) strcmp);
2197         min = SIZE_T_MAX;
2198         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2199                 b = list[i + 1];
2200                 for (j = 0; a[j] && a[j] == b[j]; j++)
2201                         continue;
2202                 if (min > j)
2203                         min = j;
2204         }
2205         if (min == 0 && *str) {
2206                 if ((list[0] = strdup(str)) == NULL)
2207                         goto out;
2208         } else {
2209                 if ((list[0] = el_malloc((min + 1) * sizeof(*list[0]))) == NULL)
2210                         goto out;
2211                 (void)memcpy(list[0], list[1], min);
2212                 list[0][min] = '\0';
2213         }
2214         return list;
2215
2216 out:
2217         el_free(list);
2218         return NULL;
2219 }
2220
2221 char *
2222 rl_filename_completion_function (const char *text, int state)
2223 {
2224         return fn_filename_completion_function(text, state);
2225 }
2226
2227 void
2228 rl_forced_update_display(void)
2229 {
2230         el_set(e, EL_REFRESH);
2231 }
2232
2233 int
2234 _rl_abort_internal(void)
2235 {
2236         el_beep(e);
2237         longjmp(topbuf, 1);
2238         /*NOTREACHED*/
2239 }
2240
2241 int
2242 _rl_qsort_string_compare(char **s1, char **s2)
2243 {
2244         return strcoll(*s1, *s2);
2245 }
2246
2247 HISTORY_STATE *
2248 history_get_history_state(void)
2249 {
2250         HISTORY_STATE *hs;
2251
2252         if ((hs = el_malloc(sizeof(*hs))) == NULL)
2253                 return NULL;
2254         hs->length = history_length;
2255         return hs;
2256 }
2257
2258 int
2259 /*ARGSUSED*/
2260 rl_kill_text(int from __attribute__((__unused__)),
2261     int to __attribute__((__unused__)))
2262 {
2263         return 0;
2264 }
2265
2266 Keymap
2267 rl_make_bare_keymap(void)
2268 {
2269         return NULL;
2270 }
2271
2272 Keymap
2273 rl_get_keymap(void)
2274 {
2275         return NULL;
2276 }
2277
2278 void
2279 /*ARGSUSED*/
2280 rl_set_keymap(Keymap k __attribute__((__unused__)))
2281 {
2282 }
2283
2284 int
2285 /*ARGSUSED*/
2286 rl_generic_bind(int type __attribute__((__unused__)),
2287     const char * keyseq __attribute__((__unused__)),
2288     const char * data __attribute__((__unused__)),
2289     Keymap k __attribute__((__unused__)))
2290 {
2291         return 0;
2292 }
2293
2294 int
2295 /*ARGSUSED*/
2296 rl_bind_key_in_map(int key __attribute__((__unused__)),
2297     rl_command_func_t *fun __attribute__((__unused__)),
2298     Keymap k __attribute__((__unused__)))
2299 {
2300         return 0;
2301 }
2302
2303 /* unsupported, but needed by python */
2304 void
2305 rl_cleanup_after_signal(void)
2306 {
2307 }
2308
2309 int
2310 rl_on_new_line(void)
2311 {
2312         return 0;
2313 }
2314
2315 void
2316 rl_free_line_state(void)
2317 {
2318 }