lib/libedit/readline.c

   1 /*      $OpenBSD: readline.c,v 1.27 2016/05/31 16:12:00 schwarze Exp $  */
   2 /*      $NetBSD: readline.c,v 1.91 2010/08/28 15:44:59 christos Exp $   */
   3
   4 /*-
   5  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The NetBSD Foundation
   9  * by Jaromir Dolecek.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include "config.h"
  34
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <ctype.h>
  38 #include <dirent.h>
  39 #include <errno.h>
  40 #include <fcntl.h>
  41 #include <limits.h>
  42 #include <pwd.h>
  43 #include <setjmp.h>
  44 #include <stdint.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49 #ifdef HAVE_VIS_H
  50 #include <vis.h>
  51 #else
  52 #include "np/vis.h"
  53 #endif
  54 #include "readline/readline.h"
  55 #include "el.h"
  56 #include "fcns.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 VCPFunction *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 int history_base = 1;           /* probably never subject to change */
  90 int history_length = 0;
  91 int max_input_history = 0;
  92 char history_expansion_char = '!';
  93 char history_subst_char = '^';
  94 char *history_no_expand_chars = expand_chars;
  95 Function *history_inhibit_expansion_function = NULL;
  96 char *history_arg_extract(int start, int end, const char *str);
  97
  98 int rl_inhibit_completion = 0;
  99 int rl_attempted_completion_over = 0;
 100 char *rl_basic_word_break_characters = break_chars;
 101 char *rl_completer_word_break_characters = NULL;
 102 char *rl_completer_quote_characters = NULL;
 103 Function *rl_completion_entry_function = NULL;
 104 CPPFunction *rl_attempted_completion_function = NULL;
 105 Function *rl_pre_input_hook = NULL;
 106 Function *rl_startup1_hook = NULL;
 107 int (*rl_getc_function)(FILE *) = NULL;
 108 char *rl_terminal_name = NULL;
 109 int rl_already_prompted = 0;
 110 int rl_filename_completion_desired = 0;
 111 int rl_ignore_completion_duplicates = 0;
 112 int rl_catch_signals = 1;
 113 int readline_echoing_p = 1;
 114 int _rl_print_completions_horizontally = 0;
 115 VFunction *rl_redisplay_function = NULL;
 116 Function *rl_startup_hook = NULL;
 117 VFunction *rl_completion_display_matches_hook = NULL;
 118 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 119 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 120 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 121
 122 /*
 123  * The current prompt string.
 124  */
 125 char *rl_prompt = NULL;
 126 /*
 127  * This is set to character indicating type of completion being done by
 128  * rl_complete_internal(); this is available for application completion
 129  * functions.
 130  */
 131 int rl_completion_type = 0;
 132
 133 /*
 134  * If more than this number of items results from query for possible
 135  * completions, we ask user if they are sure to really display the list.
 136  */
 137 int rl_completion_query_items = 100;
 138
 139 /*
 140  * List of characters which are word break characters, but should be left
 141  * in the parsed text when it is passed to the completion function.
 142  * Shell uses this to help determine what kind of completing to do.
 143  */
 144 char *rl_special_prefixes = NULL;
 145
 146 /*
 147  * This is the character appended to the completed words if at the end of
 148  * the line. Default is ' ' (a space).
 149  */
 150 int rl_completion_append_character = ' ';
 151
 152 /*
 153  * When the history cursor is on the newest element and next_history()
 154  * is called, GNU readline moves the cursor beyond the newest element.
 155  * The editline library does not provide data structures to express
 156  * that state, so we need a local flag.
 157  */
 158 static int current_history_valid = 1;
 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 Function *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, 1);
 234 }
 235
 236 static const char _dothistory[] = "/.history";
 237
 238 static const char *
 239 _default_history_file(void)
 240 {
 241         struct passwd *p;
 242         static char path[PATH_MAX];
 243
 244         if (*path)
 245                 return path;
 246         if ((p = getpwuid(getuid())) == NULL)
 247                 return NULL;
 248         strlcpy(path, p->pw_dir, PATH_MAX);
 249         strlcat(path, _dothistory, PATH_MAX);
 250         return path;
 251 }
 252
 253 /*
 254  * READLINE compatibility stuff
 255  */
 256
 257 /*
 258  * Set the prompt
 259  */
 260 int
 261 rl_set_prompt(const char *prompt)
 262 {
 263         char *p;
 264
 265         if (!prompt)
 266                 prompt = "";
 267         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 268                 return 0;
 269         if (rl_prompt)
 270                 free(rl_prompt);
 271         rl_prompt = strdup(prompt);
 272         if (rl_prompt == NULL)
 273                 return -1;
 274
 275         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 276                 *p = RL_PROMPT_START_IGNORE;
 277
 278         return 0;
 279 }
 280
 281 /*
 282  * initialize rl compat stuff
 283  */
 284 int
 285 rl_initialize(void)
 286 {
 287         HistEvent ev;
 288         int editmode = 1;
 289         struct termios t;
 290
 291         current_history_valid = 1;
 292
 293         if (e != NULL)
 294                 el_end(e);
 295         if (h != NULL)
 296                 history_end(h);
 297
 298         if (!rl_instream)
 299                 rl_instream = stdin;
 300         if (!rl_outstream)
 301                 rl_outstream = stdout;
 302
 303         /*
 304          * See if we don't really want to run the editor
 305          */
 306         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 307                 editmode = 0;
 308
 309         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 310
 311         if (!editmode)
 312                 el_set(e, EL_EDITMODE, 0);
 313
 314         h = history_init();
 315         if (!e || !h)
 316                 return -1;
 317
 318         history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
 319         history_length = 0;
 320         max_input_history = INT_MAX;
 321         el_set(e, EL_HIST, history, h);
 322
 323         /* Setup resize function */
 324         el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
 325
 326         /* setup getc function if valid */
 327         if (rl_getc_function)
 328                 el_set(e, EL_GETCFN, _getc_function);
 329
 330         /* for proper prompt printing in readline() */
 331         if (rl_set_prompt("") == -1) {
 332                 history_end(h);
 333                 el_end(e);
 334                 return -1;
 335         }
 336         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 337         el_set(e, EL_SIGNAL, rl_catch_signals);
 338
 339         /* set default mode to "emacs"-style and read setting afterwards */
 340         /* so this can be overriden */
 341         el_set(e, EL_EDITOR, "emacs");
 342         if (rl_terminal_name != NULL)
 343                 el_set(e, EL_TERMINAL, rl_terminal_name);
 344         else
 345                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 346
 347         /*
 348          * Word completion - this has to go AFTER rebinding keys
 349          * to emacs-style.
 350          */
 351         el_set(e, EL_ADDFN, "rl_complete",
 352             "ReadLine compatible completion function",
 353             _el_rl_complete);
 354         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 355
 356         /*
 357          * Send TSTP when ^Z is pressed.
 358          */
 359         el_set(e, EL_ADDFN, "rl_tstp",
 360             "ReadLine compatible suspend function",
 361             _el_rl_tstp);
 362         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 363
 364         /* read settings from configuration file */
 365         el_source(e, NULL);
 366
 367         /*
 368          * Unfortunately, some applications really do use rl_point
 369          * and rl_line_buffer directly.
 370          */
 371         _resize_fun(e, &rl_line_buffer);
 372         _rl_update_pos();
 373
 374         if (rl_startup_hook)
 375                 (*rl_startup_hook)(NULL, 0);
 376
 377         return 0;
 378 }
 379
 380
 381 /*
 382  * read one line from input stream and return it, chomping
 383  * trailing newline (if there is any)
 384  */
 385 char *
 386 readline(const char *p)
 387 {
 388         HistEvent ev;
 389         const char * volatile prompt = p;
 390         int count;
 391         const char *ret;
 392         char *buf;
 393         static int used_event_hook;
 394
 395         if (e == NULL || h == NULL)
 396                 rl_initialize();
 397
 398         rl_done = 0;
 399
 400         (void)setjmp(topbuf);
 401
 402         /* update prompt accordingly to what has been passed */
 403         if (rl_set_prompt(prompt) == -1)
 404                 return NULL;
 405
 406         if (rl_pre_input_hook)
 407                 (*rl_pre_input_hook)(NULL, 0);
 408
 409         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 410                 el_set(e, EL_GETCFN, _rl_event_read_char);
 411                 used_event_hook = 1;
 412         }
 413
 414         if (!rl_event_hook && used_event_hook) {
 415                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 416                 used_event_hook = 0;
 417         }
 418
 419         rl_already_prompted = 0;
 420
 421         /* get one line from input stream */
 422         ret = el_gets(e, &count);
 423
 424         if (ret && count > 0) {
 425                 int lastidx;
 426
 427                 buf = strdup(ret);
 428                 if (buf == NULL)
 429                         return NULL;
 430                 lastidx = count - 1;
 431                 if (buf[lastidx] == '\n')
 432                         buf[lastidx] = '\0';
 433         } else
 434                 buf = NULL;
 435
 436         history(h, &ev, H_GETSIZE);
 437         history_length = ev.num;
 438
 439         return buf;
 440 }
 441
 442 /*
 443  * history functions
 444  */
 445
 446 /*
 447  * is normally called before application starts to use
 448  * history expansion functions
 449  */
 450 void
 451 using_history(void)
 452 {
 453         if (h == NULL || e == NULL)
 454                 rl_initialize();
 455 }
 456
 457
 458 /*
 459  * substitute ``what'' with ``with'', returning resulting string; if
 460  * globally == 1, substitutes all occurrences of what, otherwise only the
 461  * first one
 462  */
 463 static char *
 464 _rl_compat_sub(const char *str, const char *what, const char *with,
 465     int globally)
 466 {
 467         const   char    *s;
 468         char    *r, *result;
 469         size_t  len, with_len, what_len;
 470
 471         len = strlen(str);
 472         with_len = strlen(with);
 473         what_len = strlen(what);
 474
 475         /* calculate length we need for result */
 476         s = str;
 477         while (*s) {
 478                 if (*s == *what && !strncmp(s, what, what_len)) {
 479                         len += with_len - what_len;
 480                         if (!globally)
 481                                 break;
 482                         s += what_len;
 483                 } else
 484                         s++;
 485         }
 486         r = result = malloc(len + 1);
 487         if (result == NULL)
 488                 return NULL;
 489         s = str;
 490         while (*s) {
 491                 if (*s == *what && !strncmp(s, what, what_len)) {
 492                         (void)strncpy(r, with, with_len);
 493                         r += with_len;
 494                         s += what_len;
 495                         if (!globally) {
 496                                 (void)strlcpy(r, s, len);
 497                                 return result;
 498                         }
 499                 } else
 500                         *r++ = *s++;
 501         }
 502         *r = '\0';
 503         return result;
 504 }
 505
 506 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 507 static  char    *last_search_match;     /* last !?pat[?] that matched */
 508
 509 const char *
 510 get_history_event(const char *cmd, int *cindex, int qchar)
 511 {
 512         int idx, sign, sub, num, begin, ret;
 513         size_t len;
 514         char    *pat;
 515         const char *rptr;
 516         HistEvent ev;
 517
 518         idx = *cindex;
 519         if (cmd[idx++] != history_expansion_char)
 520                 return NULL;
 521
 522         /* find out which event to take */
 523         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 524                 if (history(h, &ev, H_FIRST) != 0)
 525                         return NULL;
 526                 *cindex = cmd[idx]? (idx + 1):idx;
 527                 return ev.str;
 528         }
 529         sign = 0;
 530         if (cmd[idx] == '-') {
 531                 sign = 1;
 532                 idx++;
 533         }
 534
 535         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 536                 HIST_ENTRY *rl_he;
 537
 538                 num = 0;
 539                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 540                         num = num * 10 + cmd[idx] - '0';
 541                         idx++;
 542                 }
 543                 if (sign)
 544                         num = history_length - num + 1;
 545
 546                 if (!(rl_he = history_get(num)))
 547                         return NULL;
 548
 549                 *cindex = idx;
 550                 return rl_he->line;
 551         }
 552         sub = 0;
 553         if (cmd[idx] == '?') {
 554                 sub = 1;
 555                 idx++;
 556         }
 557         begin = idx;
 558         while (cmd[idx]) {
 559                 if (cmd[idx] == '\n')
 560                         break;
 561                 if (sub && cmd[idx] == '?')
 562                         break;
 563                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 564                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 565                         break;
 566                 idx++;
 567         }
 568         len = idx - begin;
 569         if (sub && cmd[idx] == '?')
 570                 idx++;
 571         if (sub && len == 0 && last_search_pat && *last_search_pat)
 572                 pat = last_search_pat;
 573         else if (len == 0)
 574                 return NULL;
 575         else {
 576                 if ((pat = malloc(len + 1)) == NULL)
 577                         return NULL;
 578                 (void)strncpy(pat, cmd + begin, len);
 579                 pat[len] = '\0';
 580         }
 581
 582         if (history(h, &ev, H_CURR) != 0) {
 583                 if (pat != last_search_pat)
 584                         free(pat);
 585                 return NULL;
 586         }
 587         num = ev.num;
 588
 589         if (sub) {
 590                 if (pat != last_search_pat) {
 591                         if (last_search_pat)
 592                                 free(last_search_pat);
 593                         last_search_pat = pat;
 594                 }
 595                 ret = history_search(pat, -1);
 596         } else
 597                 ret = history_search_prefix(pat, -1);
 598
 599         if (ret == -1) {
 600                 /* restore to end of list on failed search */
 601                 history(h, &ev, H_FIRST);
 602                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 603                 if (pat != last_search_pat)
 604                         free(pat);
 605                 return NULL;
 606         }
 607
 608         if (sub && len) {
 609                 if (last_search_match && last_search_match != pat)
 610                         free(last_search_match);
 611                 last_search_match = pat;
 612         }
 613
 614         if (pat != last_search_pat)
 615                 free(pat);
 616
 617         if (history(h, &ev, H_CURR) != 0)
 618                 return NULL;
 619         *cindex = idx;
 620         rptr = ev.str;
 621
 622         /* roll back to original position */
 623         (void)history(h, &ev, H_SET, num);
 624
 625         return rptr;
 626 }
 627
 628 /*
 629  * the real function doing history expansion - takes as argument command
 630  * to do and data upon which the command should be executed
 631  * does expansion the way I've understood readline documentation
 632  *
 633  * returns 0 if data was not modified, 1 if it was and 2 if the string
 634  * should be only printed and not executed; in case of error,
 635  * returns -1 and *result points to NULL
 636  * it's the caller's responsibility to free() the string returned in *result
 637  */
 638 static int
 639 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 640     char **result)
 641 {
 642         char *tmp, *search = NULL, *aptr;
 643         const char *ptr, *cmd;
 644         static char *from = NULL, *to = NULL;
 645         int start, end, idx, has_mods = 0;
 646         int p_on = 0, g_on = 0;
 647
 648         *result = NULL;
 649         aptr = NULL;
 650         ptr = NULL;
 651
 652         /* First get event specifier */
 653         idx = 0;
 654
 655         if (strchr(":^*$", command[offs + 1])) {
 656                 char str[4];
 657                 /*
 658                 * "!:" is shorthand for "!!:".
 659                 * "!^", "!*" and "!$" are shorthand for
 660                 * "!!:^", "!!:*" and "!!:$" respectively.
 661                 */
 662                 str[0] = str[1] = '!';
 663                 str[2] = '0';
 664                 ptr = get_history_event(str, &idx, 0);
 665                 idx = (command[offs + 1] == ':')? 1:0;
 666                 has_mods = 1;
 667         } else {
 668                 if (command[offs + 1] == '#') {
 669                         /* use command so far */
 670                         if ((aptr = malloc(offs + 1)) == NULL)
 671                                 return -1;
 672                         (void)strncpy(aptr, command, offs);
 673                         aptr[offs] = '\0';
 674                         idx = 1;
 675                 } else {
 676                         int     qchar;
 677
 678                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 679                         ptr = get_history_event(command + offs, &idx, qchar);
 680                 }
 681                 has_mods = command[offs + idx] == ':';
 682         }
 683
 684         if (ptr == NULL && aptr == NULL)
 685                 return -1;
 686
 687         if (!has_mods) {
 688                 *result = strdup(aptr ? aptr : ptr);
 689                 if (aptr)
 690                         free(aptr);
 691                 if (*result == NULL)
 692                         return -1;
 693                 return 1;
 694         }
 695
 696         cmd = command + offs + idx + 1;
 697
 698         /* Now parse any word designators */
 699
 700         if (*cmd == '%')        /* last word matched by ?pat? */
 701                 tmp = strdup(last_search_match? last_search_match:"");
 702         else if (strchr("^*$-0123456789", *cmd)) {
 703                 start = end = -1;
 704                 if (*cmd == '^')
 705                         start = end = 1, cmd++;
 706                 else if (*cmd == '$')
 707                         start = -1, cmd++;
 708                 else if (*cmd == '*')
 709                         start = 1, cmd++;
 710                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 711                         start = 0;
 712                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 713                                 start = start * 10 + *cmd++ - '0';
 714
 715                         if (*cmd == '-') {
 716                                 if (isdigit((unsigned char) cmd[1])) {
 717                                         cmd++;
 718                                         end = 0;
 719                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 720                                                 end = end * 10 + *cmd++ - '0';
 721                                 } else if (cmd[1] == '$') {
 722                                         cmd += 2;
 723                                         end = -1;
 724                                 } else {
 725                                         cmd++;
 726                                         end = -2;
 727                                 }
 728                         } else if (*cmd == '*')
 729                                 end = -1, cmd++;
 730                         else
 731                                 end = start;
 732                 }
 733                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 734                 if (tmp == NULL) {
 735                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 736                             command + offs + idx);
 737                         if (aptr)
 738                                 free(aptr);
 739                         return -1;
 740                 }
 741         } else
 742                 tmp = strdup(aptr? aptr:ptr);
 743
 744         if (aptr)
 745                 free(aptr);
 746
 747         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 748                 *result = tmp;
 749                 return 1;
 750         }
 751
 752         for (; *cmd; cmd++) {
 753                 if (*cmd == ':')
 754                         continue;
 755                 else if (*cmd == 'h') {         /* remove trailing path */
 756                         if ((aptr = strrchr(tmp, '/')) != NULL)
 757                                 *aptr = '\0';
 758                 } else if (*cmd == 't') {       /* remove leading path */
 759                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 760                                 aptr = strdup(aptr + 1);
 761                                 free(tmp);
 762                                 tmp = aptr;
 763                         }
 764                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 765                         if ((aptr = strrchr(tmp, '.')) != NULL)
 766                                 *aptr = '\0';
 767                 } else if (*cmd == 'e') {       /* remove all but suffix */
 768                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 769                                 aptr = strdup(aptr);
 770                                 free(tmp);
 771                                 tmp = aptr;
 772                         }
 773                 } else if (*cmd == 'p')         /* print only */
 774                         p_on = 1;
 775                 else if (*cmd == 'g')
 776                         g_on = 2;
 777                 else if (*cmd == 's' || *cmd == '&') {
 778                         char *what, *with, delim;
 779                         size_t len, from_len;
 780                         size_t size;
 781
 782                         if (*cmd == '&' && (from == NULL || to == NULL))
 783                                 continue;
 784                         else if (*cmd == 's') {
 785                                 delim = *(++cmd), cmd++;
 786                                 size = 16;
 787                                 what = realloc(from, size);
 788                                 if (what == NULL) {
 789                                         free(from);
 790                                         free(tmp);
 791                                         return 0;
 792                                 }
 793                                 len = 0;
 794                                 for (; *cmd && *cmd != delim; cmd++) {
 795                                         if (*cmd == '\\' && cmd[1] == delim)
 796                                                 cmd++;
 797                                         if (len >= size) {
 798                                                 char *nwhat;
 799                                                 nwhat = reallocarray(what,
 800                                                     size, 2);
 801                                                 if (nwhat == NULL) {
 802                                                         free(what);
 803                                                         free(tmp);
 804                                                         return 0;
 805                                                 }
 806                                                 size *= 2;
 807                                                 what = nwhat;
 808                                         }
 809                                         what[len++] = *cmd;
 810                                 }
 811                                 what[len] = '\0';
 812                                 from = what;
 813                                 if (*what == '\0') {
 814                                         free(what);
 815                                         if (search) {
 816                                                 from = strdup(search);
 817                                                 if (from == NULL) {
 818                                                         free(tmp);
 819                                                         return 0;
 820                                                 }
 821                                         } else {
 822                                                 from = NULL;
 823                                                 free(tmp);
 824                                                 return -1;
 825                                         }
 826                                 }
 827                                 cmd++;  /* shift after delim */
 828                                 if (!*cmd)
 829                                         continue;
 830
 831                                 size = 16;
 832                                 with = realloc(to, size);
 833                                 if (with == NULL) {
 834                                         free(to);
 835                                         free(tmp);
 836                                         return -1;
 837                                 }
 838                                 len = 0;
 839                                 from_len = strlen(from);
 840                                 for (; *cmd && *cmd != delim; cmd++) {
 841                                         if (len + from_len + 1 >= size) {
 842                                                 char *nwith;
 843                                                 size += from_len + 1;
 844                                                 nwith = realloc(with, size);
 845                                                 if (nwith == NULL) {
 846                                                         free(with);
 847                                                         free(tmp);
 848                                                         return -1;
 849                                                 }
 850                                                 with = nwith;
 851                                         }
 852                                         if (*cmd == '&') {
 853                                                 /* safe */
 854                                                 (void)strlcpy(&with[len], from,
 855                                                     size - len);
 856                                                 len += from_len;
 857                                                 continue;
 858                                         }
 859                                         if (*cmd == '\\'
 860                                             && (*(cmd + 1) == delim
 861                                                 || *(cmd + 1) == '&'))
 862                                                 cmd++;
 863                                         with[len++] = *cmd;
 864                                 }
 865                                 with[len] = '\0';
 866                                 to = with;
 867                         }
 868
 869                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 870                         if (aptr) {
 871                                 free(tmp);
 872                                 tmp = aptr;
 873                         }
 874                         g_on = 0;
 875                 }
 876         }
 877         *result = tmp;
 878         return p_on? 2:1;
 879 }
 880
 881
 882 /*
 883  * csh-style history expansion
 884  */
 885 int
 886 history_expand(char *str, char **output)
 887 {
 888         int ret = 0;
 889         size_t idx, i, size;
 890         char *tmp, *result;
 891
 892         if (h == NULL || e == NULL)
 893                 rl_initialize();
 894
 895         if (history_expansion_char == 0) {
 896                 *output = strdup(str);
 897                 return 0;
 898         }
 899
 900         *output = NULL;
 901         if (str[0] == history_subst_char) {
 902                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 903                 size_t sz = 4 + strlen(str) + 1;
 904                 *output = malloc(sz);
 905                 if (*output == NULL)
 906                         return 0;
 907                 (*output)[0] = (*output)[1] = history_expansion_char;
 908                 (*output)[2] = ':';
 909                 (*output)[3] = 's';
 910                 (void)strlcpy((*output) + 4, str, sz - 4);
 911                 str = *output;
 912         } else {
 913                 *output = strdup(str);
 914                 if (*output == NULL)
 915                         return 0;
 916         }
 917
 918 #define ADD_STRING(what, len, fr)                                       \
 919         {                                                               \
 920                 if (idx + len + 1 > size) {                             \
 921                         char *nresult = realloc(result, (size += len + 1));\
 922                         if (nresult == NULL) {                          \
 923                                 free(*output);                          \
 924                                 if (/*CONSTCOND*/fr)                    \
 925                                         free(tmp);                      \
 926                                 return 0;                               \
 927                         }                                               \
 928                         result = nresult;                               \
 929                 }                                                       \
 930                 (void)strncpy(&result[idx], what, len);                 \
 931                 idx += len;                                             \
 932                 result[idx] = '\0';                                     \
 933         }
 934
 935         result = NULL;
 936         size = idx = 0;
 937         tmp = NULL;
 938         for (i = 0; str[i];) {
 939                 int qchar, loop_again;
 940                 size_t len, start, j;
 941
 942                 qchar = 0;
 943                 loop_again = 1;
 944                 start = j = i;
 945 loop:
 946                 for (; str[j]; j++) {
 947                         if (str[j] == '\\' &&
 948                             str[j + 1] == history_expansion_char) {
 949                                 size_t sz = strlen(&str[j]) + 1;
 950                                 (void)strlcpy(&str[j], &str[j + 1], sz);
 951                                 continue;
 952                         }
 953                         if (!loop_again) {
 954                                 if (isspace((unsigned char) str[j])
 955                                     || str[j] == qchar)
 956                                         break;
 957                         }
 958                         if (str[j] == history_expansion_char
 959                             && !strchr(history_no_expand_chars, str[j + 1])
 960                             && (!history_inhibit_expansion_function ||
 961                             (*history_inhibit_expansion_function)(str,
 962                             (int)j) == 0))
 963                                 break;
 964                 }
 965
 966                 if (str[j] && loop_again) {
 967                         i = j;
 968                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
 969                         j++;
 970                         if (str[j] == history_expansion_char)
 971                                 j++;
 972                         loop_again = 0;
 973                         goto loop;
 974                 }
 975                 len = i - start;
 976                 ADD_STRING(&str[start], len, 0);
 977
 978                 if (str[i] == '\0' || str[i] != history_expansion_char) {
 979                         len = j - i;
 980                         ADD_STRING(&str[i], len, 0);
 981                         if (start == 0)
 982                                 ret = 0;
 983                         else
 984                                 ret = 1;
 985                         break;
 986                 }
 987                 ret = _history_expand_command (str, i, (j - i), &tmp);
 988                 if (ret > 0 && tmp) {
 989                         len = strlen(tmp);
 990                         ADD_STRING(tmp, len, 1);
 991                 }
 992                 if (tmp) {
 993                         free(tmp);
 994                         tmp = NULL;
 995                 }
 996                 i = j;
 997         }
 998
 999         /* ret is 2 for "print only" option */
1000         if (ret == 2) {
1001                 add_history(result);
1002 #ifdef GDB_411_HACK
1003                 /* gdb 4.11 has been shipped with readline, where */
1004                 /* history_expand() returned -1 when the line     */
1005                 /* should not be executed; in readline 2.1+       */
1006                 /* it should return 2 in such a case              */
1007                 ret = -1;
1008 #endif
1009         }
1010         free(*output);
1011         *output = result;
1012
1013         return ret;
1014 }
1015
1016 /*
1017 * Return a string consisting of arguments of "str" from "start" to "end".
1018 */
1019 char *
1020 history_arg_extract(int start, int end, const char *str)
1021 {
1022         size_t  i, len, max;
1023         char    **arr, *result = NULL;
1024
1025         arr = history_tokenize(str);
1026         if (!arr)
1027                 return NULL;
1028         if (arr && *arr == NULL)
1029                 goto out;
1030
1031         for (max = 0; arr[max]; max++)
1032                 continue;
1033         max--;
1034
1035         if (start == '$')
1036                 start = (int)max;
1037         if (end == '$')
1038                 end = (int)max;
1039         if (end < 0)
1040                 end = (int)max + end + 1;
1041         if (start < 0)
1042                 start = end;
1043
1044         if (start < 0 || end < 0 || (size_t)start > max ||
1045             (size_t)end > max || start > end)
1046                 goto out;
1047
1048         for (i = start, len = 0; i <= (size_t)end; i++)
1049                 len += strlen(arr[i]) + 1;
1050         len++;
1051         max = len;
1052         result = malloc(len);
1053         if (result == NULL)
1054                 goto out;
1055
1056         for (i = start, len = 0; i <= (size_t)end; i++) {
1057                 (void)strlcpy(result + len, arr[i], max - len);
1058                 len += strlen(arr[i]);
1059                 if (i < (size_t)end)
1060                         result[len++] = ' ';
1061         }
1062         result[len] = '\0';
1063
1064 out:
1065         for (i = 0; arr[i]; i++)
1066                 free(arr[i]);
1067         free(arr);
1068
1069         return result;
1070 }
1071
1072 /*
1073  * Parse the string into individual tokens,
1074  * similar to how shell would do it.
1075  */
1076 char **
1077 history_tokenize(const char *str)
1078 {
1079         int size = 1, idx = 0, i, start;
1080         size_t len;
1081         char **result = NULL, *temp, delim = '\0';
1082
1083         for (i = 0; str[i];) {
1084                 while (isspace((unsigned char) str[i]))
1085                         i++;
1086                 start = i;
1087                 for (; str[i];) {
1088                         if (str[i] == '\\') {
1089                                 if (str[i+1] != '\0')
1090                                         i++;
1091                         } else if (str[i] == delim)
1092                                 delim = '\0';
1093                         else if (!delim &&
1094                                     (isspace((unsigned char) str[i]) ||
1095                                 strchr("()<>;&|$", str[i])))
1096                                 break;
1097                         else if (!delim && strchr("'`\"", str[i]))
1098                                 delim = str[i];
1099                         if (str[i])
1100                                 i++;
1101                 }
1102
1103                 if (idx + 2 >= size) {
1104                         char **nresult;
1105                         nresult = reallocarray(result, size,
1106                             2 * sizeof(char *));
1107                         if (nresult == NULL) {
1108                                 free(result);
1109                                 return NULL;
1110                         }
1111                         size *= 2;
1112                         result = nresult;
1113                 }
1114                 len = i - start;
1115                 temp = malloc(len + 1);
1116                 if (temp == NULL) {
1117                         for (i = 0; i < idx; i++)
1118                                 free(result[i]);
1119                         free(result);
1120                         return NULL;
1121                 }
1122                 (void)strncpy(temp, &str[start], len);
1123                 temp[len] = '\0';
1124                 result[idx++] = temp;
1125                 result[idx] = NULL;
1126                 if (str[i])
1127                         i++;
1128         }
1129         return result;
1130 }
1131
1132
1133 /*
1134  * limit size of history record to ``max'' events
1135  */
1136 void
1137 stifle_history(int max)
1138 {
1139         HistEvent ev;
1140         HIST_ENTRY *he;
1141         int i, len;
1142
1143         if (h == NULL || e == NULL)
1144                 rl_initialize();
1145
1146         len = history_length;
1147         if (history(h, &ev, H_SETSIZE, max) == 0) {
1148                 max_input_history = max;
1149                 if (max < len)
1150                         history_base += len - max;
1151                 for (i = 0; i < len - max; i++) {
1152                         he = remove_history(0);
1153                         free(he->data);
1154                         free((void *)he->line);
1155                         free(he);
1156                 }
1157         }
1158 }
1159
1160
1161 /*
1162  * "unlimit" size of history - set the limit to maximum allowed int value
1163  */
1164 int
1165 unstifle_history(void)
1166 {
1167         HistEvent ev;
1168         int omax;
1169
1170         history(h, &ev, H_SETSIZE, INT_MAX);
1171         omax = max_input_history;
1172         max_input_history = INT_MAX;
1173         return omax;            /* some value _must_ be returned */
1174 }
1175
1176
1177 int
1178 history_is_stifled(void)
1179 {
1180
1181         /* cannot return true answer */
1182         return max_input_history != INT_MAX;
1183 }
1184
1185 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1186
1187 int
1188 history_truncate_file (const char *filename, int nlines)
1189 {
1190         int ret = 0;
1191         FILE *fp, *tp;
1192         char template[sizeof(_history_tmp_template)];
1193         char buf[4096];
1194         int fd;
1195         char *cp;
1196         off_t off;
1197         int count = 0;
1198         ssize_t left = 0;
1199
1200         if (filename == NULL && (filename = _default_history_file()) == NULL)
1201                 return errno;
1202         if ((fp = fopen(filename, "r+")) == NULL)
1203                 return errno;
1204         strlcpy(template, _history_tmp_template, sizeof(template));
1205         if ((fd = mkstemp(template)) == -1) {
1206                 ret = errno;
1207                 goto out1;
1208         }
1209
1210         if ((tp = fdopen(fd, "r+")) == NULL) {
1211                 close(fd);
1212                 ret = errno;
1213                 goto out2;
1214         }
1215
1216         for(;;) {
1217                 if (fread(buf, sizeof(buf), 1, fp) != 1) {
1218                         if (ferror(fp)) {
1219                                 ret = errno;
1220                                 break;
1221                         }
1222                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1223                             (off_t)-1) {
1224                                 ret = errno;
1225                                 break;
1226                         }
1227                         left = fread(buf, 1, sizeof(buf), fp);
1228                         if (ferror(fp)) {
1229                                 ret = errno;
1230                                 break;
1231                         }
1232                         if (left == 0) {
1233                                 count--;
1234                                 left = sizeof(buf);
1235                         } else if (fwrite(buf, (size_t)left, 1, tp) != 1) {
1236                                 ret = errno;
1237                                 break;
1238                         }
1239                         fflush(tp);
1240                         break;
1241                 }
1242                 if (fwrite(buf, sizeof(buf), 1, tp) != 1) {
1243                         ret = errno;
1244                         break;
1245                 }
1246                 count++;
1247         }
1248         if (ret)
1249                 goto out3;
1250         cp = buf + left - 1;
1251         if(*cp != '\n')
1252                 cp++;
1253         for(;;) {
1254                 while (--cp >= buf) {
1255                         if (*cp == '\n') {
1256                                 if (--nlines == 0) {
1257                                         if (++cp >= buf + sizeof(buf)) {
1258                                                 count++;
1259                                                 cp = buf;
1260                                         }
1261                                         break;
1262                                 }
1263                         }
1264                 }
1265                 if (nlines <= 0 || count == 0)
1266                         break;
1267                 count--;
1268                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1269                         ret = errno;
1270                         break;
1271                 }
1272                 if (fread(buf, sizeof(buf), 1, tp) != 1) {
1273                         if (ferror(tp)) {
1274                                 ret = errno;
1275                                 break;
1276                         }
1277                         ret = EAGAIN;
1278                         break;
1279                 }
1280                 cp = buf + sizeof(buf);
1281         }
1282
1283         if (ret || nlines > 0)
1284                 goto out3;
1285
1286         if (fseeko(fp, 0, SEEK_SET) == (off_t)-1) {
1287                 ret = errno;
1288                 goto out3;
1289         }
1290
1291         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1292             (off_t)-1) {
1293                 ret = errno;
1294                 goto out3;
1295         }
1296
1297         for(;;) {
1298                 if ((left = fread(buf, 1, sizeof(buf), tp)) == 0) {
1299                         if (ferror(fp))
1300                                 ret = errno;
1301                         break;
1302                 }
1303                 if (fwrite(buf, (size_t)left, 1, fp) != 1) {
1304                         ret = errno;
1305                         break;
1306                 }
1307         }
1308         fflush(fp);
1309         if((off = ftello(fp)) > 0)
1310                 (void)ftruncate(fileno(fp), off);
1311 out3:
1312         fclose(tp);
1313 out2:
1314         unlink(template);
1315 out1:
1316         fclose(fp);
1317
1318         return ret;
1319 }
1320
1321
1322 /*
1323  * read history from a file given
1324  */
1325 int
1326 read_history(const char *filename)
1327 {
1328         HistEvent ev;
1329
1330         if (h == NULL || e == NULL)
1331                 rl_initialize();
1332         if (filename == NULL && (filename = _default_history_file()) == NULL)
1333                 return errno;
1334         return history(h, &ev, H_LOAD, filename) == -1 ?
1335             (errno ? errno : EINVAL) : 0;
1336 }
1337
1338
1339 /*
1340  * write history to a file given
1341  */
1342 int
1343 write_history(const char *filename)
1344 {
1345         HistEvent ev;
1346
1347         if (h == NULL || e == NULL)
1348                 rl_initialize();
1349         if (filename == NULL && (filename = _default_history_file()) == NULL)
1350                 return errno;
1351         return history(h, &ev, H_SAVE, filename) == -1 ?
1352             (errno ? errno : EINVAL) : 0;
1353 }
1354
1355
1356 /*
1357  * returns history ``num''th event
1358  *
1359  * returned pointer points to static variable
1360  */
1361 HIST_ENTRY *
1362 history_get(int num)
1363 {
1364         static HIST_ENTRY she;
1365         HistEvent ev;
1366         int curr_num;
1367
1368         if (h == NULL || e == NULL)
1369                 rl_initialize();
1370
1371         if (num < history_base)
1372                 return NULL;
1373
1374         /* save current position */
1375         if (history(h, &ev, H_CURR) != 0)
1376                 return NULL;
1377         curr_num = ev.num;
1378
1379         /*
1380          * use H_DELDATA to set to nth history (without delete) by passing
1381          * (void **)-1  -- as in history_set_pos
1382          */
1383         if (history(h, &ev, H_DELDATA, num - history_base, (void **)-1) != 0)
1384                 goto out;
1385
1386         /* get current entry */
1387         if (history(h, &ev, H_CURR) != 0)
1388                 goto out;
1389         if (history(h, &ev, H_NEXT_EVDATA, ev.num, &she.data) != 0)
1390                 goto out;
1391         she.line = ev.str;
1392
1393         /* restore pointer to where it was */
1394         (void)history(h, &ev, H_SET, curr_num);
1395
1396         return &she;
1397
1398 out:
1399         /* restore pointer to where it was */
1400         (void)history(h, &ev, H_SET, curr_num);
1401         return NULL;
1402 }
1403
1404
1405 /*
1406  * add the line to history table
1407  */
1408 int
1409 add_history(const char *line)
1410 {
1411         HistEvent ev;
1412
1413         if (h == NULL || e == NULL)
1414                 rl_initialize();
1415
1416         (void)history(h, &ev, H_ENTER, line);
1417         if (history(h, &ev, H_GETSIZE) == 0)
1418                 history_length = ev.num;
1419         current_history_valid = 1;
1420
1421         return !(history_length > 0); /* return 0 if all is okay */
1422 }
1423
1424
1425 /*
1426  * remove the specified entry from the history list and return it.
1427  */
1428 HIST_ENTRY *
1429 remove_history(int num)
1430 {
1431         HIST_ENTRY *he;
1432         HistEvent ev;
1433
1434         if (h == NULL || e == NULL)
1435                 rl_initialize();
1436
1437         if ((he = malloc(sizeof(*he))) == NULL)
1438                 return NULL;
1439
1440         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1441                 free(he);
1442                 return NULL;
1443         }
1444
1445         he->line = ev.str;
1446         if (history(h, &ev, H_GETSIZE) == 0)
1447                 history_length = ev.num;
1448
1449         return he;
1450 }
1451
1452
1453 /*
1454  * replace the line and data of the num-th entry
1455  */
1456 HIST_ENTRY *
1457 replace_history_entry(int num, const char *line, histdata_t data)
1458 {
1459         HIST_ENTRY *he;
1460         HistEvent ev;
1461         int curr_num;
1462
1463         if (h == NULL || e == NULL)
1464                 rl_initialize();
1465
1466         /* save current position */
1467         if (history(h, &ev, H_CURR) != 0)
1468                 return NULL;
1469         curr_num = ev.num;
1470
1471         /* start from the oldest */
1472         if (history(h, &ev, H_LAST) != 0)
1473                 return NULL;    /* error */
1474
1475         if ((he = malloc(sizeof(*he))) == NULL)
1476                 return NULL;
1477
1478         /* look forwards for event matching specified offset */
1479         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1480                 goto out;
1481
1482         he->line = strdup(ev.str);
1483         if (he->line == NULL)
1484                 goto out;
1485
1486         if (history(h, &ev, H_REPLACE, line, data))
1487                 goto out;
1488
1489         /* restore pointer to where it was */
1490         if (history(h, &ev, H_SET, curr_num))
1491                 goto out;
1492
1493         return he;
1494 out:
1495         free(he);
1496         return NULL;
1497 }
1498
1499 /*
1500  * clear the history list - delete all entries
1501  */
1502 void
1503 clear_history(void)
1504 {
1505         HistEvent ev;
1506
1507         (void)history(h, &ev, H_CLEAR);
1508         history_length = 0;
1509         current_history_valid = 1;
1510 }
1511
1512
1513 /*
1514  * returns offset of the current history event
1515  */
1516 int
1517 where_history(void)
1518 {
1519         HistEvent ev;
1520         int curr_num, off;
1521
1522         if (history(h, &ev, H_CURR) != 0)
1523                 return 0;
1524         curr_num = ev.num;
1525
1526         /* start from the oldest */
1527         (void)history(h, &ev, H_LAST);
1528
1529         /* position is zero-based */
1530         off = 0;
1531         while (ev.num != curr_num && history(h, &ev, H_PREV) == 0)
1532                 off++;
1533
1534         return off;
1535 }
1536
1537
1538 /*
1539  * returns current history event or NULL if there is no such event
1540  */
1541 HIST_ENTRY *
1542 current_history(void)
1543 {
1544
1545         return current_history_valid ? _move_history(H_CURR) : NULL;
1546 }
1547
1548
1549 /*
1550  * returns total number of bytes history events' data are using
1551  */
1552 int
1553 history_total_bytes(void)
1554 {
1555         HistEvent ev;
1556         int curr_num;
1557         size_t size;
1558
1559         if (history(h, &ev, H_CURR) != 0)
1560                 return -1;
1561         curr_num = ev.num;
1562
1563         (void)history(h, &ev, H_FIRST);
1564         size = 0;
1565         do
1566                 size += strlen(ev.str) * sizeof(*ev.str);
1567         while (history(h, &ev, H_NEXT) == 0);
1568
1569         /* get to the same position as before */
1570         history(h, &ev, H_PREV_EVENT, curr_num);
1571
1572         return (int)size;
1573 }
1574
1575
1576 /*
1577  * sets the position in the history list to ``pos''
1578  */
1579 int
1580 history_set_pos(int pos)
1581 {
1582         HistEvent ev;
1583         int curr_num;
1584
1585         if (pos >= history_length || pos < 0)
1586                 return 0;
1587
1588         (void)history(h, &ev, H_CURR);
1589         curr_num = ev.num;
1590         current_history_valid = 1;
1591
1592         /*
1593          * use H_DELDATA to set to nth history (without delete) by passing
1594          * (void **)-1
1595          */
1596         if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1597                 (void)history(h, &ev, H_SET, curr_num);
1598                 return 0;
1599         }
1600         return 1;
1601 }
1602
1603
1604 /*
1605  * returns previous event in history and shifts pointer accordingly
1606  * Note that readline and editline define directions in opposite ways.
1607  */
1608 HIST_ENTRY *
1609 previous_history(void)
1610 {
1611
1612         if (current_history_valid == 0) {
1613                 current_history_valid = 1;
1614                 return _move_history(H_CURR);
1615         }
1616         return _move_history(H_NEXT);
1617 }
1618
1619
1620 /*
1621  * returns next event in history and shifts pointer accordingly
1622  */
1623 HIST_ENTRY *
1624 next_history(void)
1625 {
1626         HIST_ENTRY *he;
1627
1628         he = _move_history(H_PREV);
1629         if (he == NULL)
1630                 current_history_valid = 0;
1631         return he;
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) || 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 is ignored
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         struct passwd *pwd;
1736
1737         if (text[0] == '\0')
1738                 return NULL;
1739
1740         if (*text == '~')
1741                 text++;
1742
1743         if (state == 0)
1744                 setpwent();
1745
1746         while ((pwd = getpwent()) != NULL && text[0] == pwd->pw_name[0]
1747             && strcmp(text, pwd->pw_name) == 0);
1748
1749         if (pwd == NULL) {
1750                 endpwent();
1751                 return NULL;
1752         }
1753         return strdup(pwd->pw_name);
1754 }
1755
1756
1757 /*
1758  * el-compatible wrapper to send TSTP on ^Z
1759  */
1760 /* ARGSUSED */
1761 static unsigned char
1762 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1763 {
1764         (void)kill(0, SIGTSTP);
1765         return CC_NORM;
1766 }
1767
1768 /*
1769  * Display list of strings in columnar format on readline's output stream.
1770  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1771  * 'max' is maximum length of string in 'matches'.
1772  */
1773 void
1774 rl_display_match_list(char **matches, int len, int max)
1775 {
1776
1777         fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1778 }
1779
1780 static const char *
1781 /*ARGSUSED*/
1782 _rl_completion_append_character_function(const char *dummy
1783     __attribute__((__unused__)))
1784 {
1785         static char buf[2];
1786         buf[0] = rl_completion_append_character;
1787         buf[1] = '\0';
1788         return buf;
1789 }
1790
1791
1792 /*
1793  * complete word at current point
1794  */
1795 /* ARGSUSED */
1796 int
1797 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1798 {
1799         static ct_buffer_t wbreak_conv, sprefix_conv;
1800
1801         if (h == NULL || e == NULL)
1802                 rl_initialize();
1803
1804         if (rl_inhibit_completion) {
1805                 char arr[2];
1806                 arr[0] = (char)invoking_key;
1807                 arr[1] = '\0';
1808                 el_insertstr(e, arr);
1809                 return CC_REFRESH;
1810         }
1811
1812         /* Just look at how many global variables modify this operation! */
1813         return fn_complete(e,
1814             (CPFunction *)rl_completion_entry_function,
1815             rl_attempted_completion_function,
1816             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1817             ct_decode_string(rl_special_prefixes, &sprefix_conv),
1818             _rl_completion_append_character_function,
1819             (size_t)rl_completion_query_items,
1820             &rl_completion_type, &rl_attempted_completion_over,
1821             &rl_point, &rl_end);
1822
1823
1824 }
1825
1826
1827 /* ARGSUSED */
1828 static unsigned char
1829 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1830 {
1831         return (unsigned char)rl_complete(0, ch);
1832 }
1833
1834 /*
1835  * misc other functions
1836  */
1837
1838 /*
1839  * bind key c to readline-type function func
1840  */
1841 int
1842 rl_bind_key(int c, rl_command_func_t *func)
1843 {
1844         int retval = -1;
1845
1846         if (h == NULL || e == NULL)
1847                 rl_initialize();
1848
1849         if (func == rl_insert) {
1850                 /* XXX notice there is no range checking of ``c'' */
1851                 e->el_map.key[c] = ED_INSERT;
1852                 retval = 0;
1853         }
1854         return retval;
1855 }
1856
1857
1858 /*
1859  * read one key from input - handles chars pushed back
1860  * to input stream also
1861  */
1862 int
1863 rl_read_key(void)
1864 {
1865         char fooarr[2 * sizeof(int)];
1866
1867         if (e == NULL || h == NULL)
1868                 rl_initialize();
1869
1870         return el_getc(e, fooarr);
1871 }
1872
1873
1874 /*
1875  * reset the terminal
1876  */
1877 /* ARGSUSED */
1878 void
1879 rl_reset_terminal(const char *p __attribute__((__unused__)))
1880 {
1881
1882         if (h == NULL || e == NULL)
1883                 rl_initialize();
1884         el_reset(e);
1885 }
1886
1887
1888 /*
1889  * insert character ``c'' back into input stream, ``count'' times
1890  */
1891 int
1892 rl_insert(int count, int c)
1893 {
1894         char arr[2];
1895
1896         if (h == NULL || e == NULL)
1897                 rl_initialize();
1898
1899         /* XXX - int -> char conversion can lose on multichars */
1900         arr[0] = c;
1901         arr[1] = '\0';
1902
1903         for (; count > 0; count--)
1904                 el_push(e, arr);
1905
1906         return 0;
1907 }
1908
1909 int
1910 rl_insert_text(const char *text)
1911 {
1912         if (!text || *text == 0)
1913                 return 0;
1914
1915         if (h == NULL || e == NULL)
1916                 rl_initialize();
1917
1918         if (el_insertstr(e, text) < 0)
1919                 return 0;
1920         return (int)strlen(text);
1921 }
1922
1923 /*ARGSUSED*/
1924 int
1925 rl_newline(int count, int c)
1926 {
1927         /*
1928          * Readline-4.0 appears to ignore the args.
1929          */
1930         return rl_insert(1, '\n');
1931 }
1932
1933 /*ARGSUSED*/
1934 static unsigned char
1935 rl_bind_wrapper(EditLine *el, unsigned char c)
1936 {
1937         if (map[c] == NULL)
1938             return CC_ERROR;
1939
1940         _rl_update_pos();
1941
1942         (*map[c])(NULL, c);
1943
1944         /* If rl_done was set by the above call, deal with it here */
1945         if (rl_done)
1946                 return CC_EOF;
1947
1948         return CC_NORM;
1949 }
1950
1951 int
1952 rl_add_defun(const char *name, Function *fun, int c)
1953 {
1954         char dest[8];
1955         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1956                 return -1;
1957         map[(unsigned char)c] = fun;
1958         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1959         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1960         el_set(e, EL_BIND, dest, name, NULL);
1961         return 0;
1962 }
1963
1964 void
1965 rl_callback_read_char()
1966 {
1967         int count = 0, done = 0;
1968         const char *buf = el_gets(e, &count);
1969         char *wbuf;
1970
1971         if (buf == NULL || count-- <= 0)
1972                 return;
1973         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1974                 done = 1;
1975         if (buf[count] == '\n' || buf[count] == '\r')
1976                 done = 2;
1977
1978         if (done && rl_linefunc != NULL) {
1979                 el_set(e, EL_UNBUFFERED, 0);
1980                 if (done == 2) {
1981                     if ((wbuf = strdup(buf)) != NULL)
1982                         wbuf[count] = '\0';
1983                 } else
1984                         wbuf = NULL;
1985                 (*(void (*)(const char *))rl_linefunc)(wbuf);
1986                 //el_set(e, EL_UNBUFFERED, 1);
1987         }
1988 }
1989
1990 void
1991 rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
1992 {
1993         if (e == NULL) {
1994                 rl_initialize();
1995         }
1996         (void)rl_set_prompt(prompt);
1997         rl_linefunc = linefunc;
1998         el_set(e, EL_UNBUFFERED, 1);
1999 }
2000
2001 void
2002 rl_callback_handler_remove(void)
2003 {
2004         el_set(e, EL_UNBUFFERED, 0);
2005         rl_linefunc = NULL;
2006 }
2007
2008 void
2009 rl_redisplay(void)
2010 {
2011         char a[2];
2012         a[0] = e->el_tty.t_c[TS_IO][C_REPRINT];
2013         a[1] = '\0';
2014         el_push(e, a);
2015 }
2016
2017 int
2018 rl_get_previous_history(int count, int key)
2019 {
2020         char a[2];
2021         a[0] = key;
2022         a[1] = '\0';
2023         while (count--)
2024                 el_push(e, a);
2025         return 0;
2026 }
2027
2028 void
2029 /*ARGSUSED*/
2030 rl_prep_terminal(int meta_flag)
2031 {
2032         el_set(e, EL_PREP_TERM, 1);
2033 }
2034
2035 void
2036 rl_deprep_terminal(void)
2037 {
2038         el_set(e, EL_PREP_TERM, 0);
2039 }
2040
2041 int
2042 rl_read_init_file(const char *s)
2043 {
2044         return el_source(e, s);
2045 }
2046
2047 int
2048 rl_parse_and_bind(const char *line)
2049 {
2050         const char **argv;
2051         int argc;
2052         Tokenizer *tok;
2053
2054         tok = tok_init(NULL);
2055         tok_str(tok, line, &argc, &argv);
2056         argc = el_parse(e, argc, argv);
2057         tok_end(tok);
2058         return argc ? 1 : 0;
2059 }
2060
2061 int
2062 rl_variable_bind(const char *var, const char *value)
2063 {
2064         /*
2065          * The proper return value is undocument, but this is what the
2066          * readline source seems to do.
2067          */
2068         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2069 }
2070
2071 void
2072 rl_stuff_char(int c)
2073 {
2074         char buf[2];
2075
2076         buf[0] = c;
2077         buf[1] = '\0';
2078         el_insertstr(e, buf);
2079 }
2080
2081 static int
2082 _rl_event_read_char(EditLine *el, wchar_t *wc)
2083 {
2084         char    ch;
2085         int     n;
2086         ssize_t num_read = 0;
2087
2088         ch = '\0';
2089         *wc = L'\0';
2090         while (rl_event_hook) {
2091
2092                 (*rl_event_hook)();
2093
2094 #if defined(FIONREAD)
2095                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2096                         return -1;
2097                 if (n)
2098                         num_read = read(el->el_infd, &ch, 1);
2099                 else
2100                         num_read = 0;
2101 #elif defined(F_SETFL) && defined(O_NDELAY)
2102                 if ((n = fcntl(el->el_infd, F_GETFL)) < 0)
2103                         return -1;
2104                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2105                         return -1;
2106                 num_read = read(el->el_infd, &ch, 1);
2107                 if (fcntl(el->el_infd, F_SETFL, n))
2108                         return -1;
2109 #else
2110                 /* not non-blocking, but what you gonna do? */
2111                 num_read = read(el->el_infd, &ch, 1);
2112                 return -1;
2113 #endif
2114
2115                 if (num_read < 0 && errno == EAGAIN)
2116                         continue;
2117                 if (num_read == 0)
2118                         continue;
2119                 break;
2120         }
2121         if (!rl_event_hook)
2122                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2123         *wc = (wchar_t)ch;
2124         return (int)num_read;
2125 }
2126
2127 static void
2128 _rl_update_pos(void)
2129 {
2130         const LineInfo *li = el_line(e);
2131
2132         rl_point = (int)(li->cursor - li->buffer);
2133         rl_end = (int)(li->lastchar - li->buffer);
2134 }
2135
2136 void
2137 rl_get_screen_size(int *rows, int *cols)
2138 {
2139         if (rows)
2140                 el_get(e, EL_GETTC, "li", rows);
2141         if (cols)
2142                 el_get(e, EL_GETTC, "co", cols);
2143 }
2144
2145 void
2146 rl_set_screen_size(int rows, int cols)
2147 {
2148         char buf[64];
2149         (void)snprintf(buf, sizeof(buf), "%d", rows);
2150         el_set(e, EL_SETTC, "li", buf, NULL);
2151         (void)snprintf(buf, sizeof(buf), "%d", cols);
2152         el_set(e, EL_SETTC, "co", buf, NULL);
2153 }
2154
2155 char **
2156 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2157 {
2158         size_t len, max, i, j, min;
2159         char **list, *match, *a, *b;
2160
2161         len = 1;
2162         max = 10;
2163         if ((list = reallocarray(NULL, max, sizeof(*list))) == NULL)
2164                 return NULL;
2165
2166         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2167                 list[len++] = match;
2168                 if (len == max) {
2169                         char **nl;
2170                         max += 10;
2171                         if ((nl = reallocarray(list, max, sizeof(*nl))) == NULL)
2172                                 goto out;
2173                         list = nl;
2174                 }
2175         }
2176         if (len == 1)
2177                 goto out;
2178         list[len] = NULL;
2179         if (len == 2) {
2180                 if ((list[0] = strdup(list[1])) == NULL)
2181                         goto out;
2182                 return list;
2183         }
2184         qsort(&list[1], len - 1, sizeof(*list),
2185             (int (*)(const void *, const void *)) strcmp);
2186         min = SIZE_MAX;
2187         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2188                 b = list[i + 1];
2189                 for (j = 0; a[j] && a[j] == b[j]; j++)
2190                         continue;
2191                 if (min > j)
2192                         min = j;
2193         }
2194         if (min == 0 && *str) {
2195                 if ((list[0] = strdup(str)) == NULL)
2196                         goto out;
2197         } else {
2198                 if ((list[0] = malloc(min + 1)) == NULL)
2199                         goto out;
2200                 (void)memcpy(list[0], list[1], min);
2201                 list[0][min] = '\0';
2202         }
2203         return list;
2204
2205 out:
2206         free(list);
2207         return NULL;
2208 }
2209
2210 char *
2211 rl_filename_completion_function (const char *text, int state)
2212 {
2213         return fn_filename_completion_function(text, state);
2214 }
2215
2216 void
2217 rl_forced_update_display(void)
2218 {
2219         el_set(e, EL_REFRESH);
2220 }
2221
2222 int
2223 _rl_abort_internal(void)
2224 {
2225         el_beep(e);
2226         longjmp(topbuf, 1);
2227         /*NOTREACHED*/
2228 }
2229
2230 int
2231 _rl_qsort_string_compare(char **s1, char **s2)
2232 {
2233         return strcoll(*s1, *s2);
2234 }
2235
2236 HISTORY_STATE *
2237 history_get_history_state(void)
2238 {
2239         HISTORY_STATE *hs;
2240
2241         if ((hs = malloc(sizeof(HISTORY_STATE))) == NULL)
2242                 return NULL;
2243         hs->length = history_length;
2244         return hs;
2245 }
2246
2247 int
2248 /*ARGSUSED*/
2249 rl_kill_text(int from, int to)
2250 {
2251         return 0;
2252 }
2253
2254 Keymap
2255 rl_make_bare_keymap(void)
2256 {
2257         return NULL;
2258 }
2259
2260 Keymap
2261 rl_get_keymap(void)
2262 {
2263         return NULL;
2264 }
2265
2266 void
2267 /*ARGSUSED*/
2268 rl_set_keymap(Keymap k)
2269 {
2270 }
2271
2272 int
2273 /*ARGSUSED*/
2274 rl_generic_bind(int type, const char * keyseq, const char * data, Keymap k)
2275 {
2276         return 0;
2277 }
2278
2279 int
2280 /*ARGSUSED*/
2281 rl_bind_key_in_map(int key, rl_command_func_t *fun, Keymap k)
2282 {
2283         return 0;
2284 }
2285
2286 /* unsupported, but needed by python */
2287 void
2288 rl_cleanup_after_signal(void)
2289 {
2290 }
2291
2292 int
2293 rl_on_new_line(void)
2294 {
2295         return 0;
2296 }
2297
2298 int
2299 /*ARGSUSED*/
2300 rl_set_keyboard_input_timeout(int u __attribute__((__unused__)))
2301 {
2302         return 0;
2303 }