lib/libedit/readline.c

   1 /*      $NetBSD: readline.c,v 1.113 2014/10/18 08:33:23 snj 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 1.113 2014/10/18 08:33:23 snj Exp $");
  35 #endif /* not lint && not SCCSID */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <stdio.h>
  42 #include <dirent.h>
  43 #include <string.h>
  44 #include <pwd.h>
  45 #include <ctype.h>
  46 #include <stdlib.h>
  47 #include <unistd.h>
  48 #include <limits.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <setjmp.h>
  52 #include <vis.h>
  53
  54 #include "readline/readline.h"
  55 #include "el.h"
  56 #include "fcns.h"               /* for EL_NUM_FCNS */
  57 #include "histedit.h"
  58 #include "filecomplete.h"
  59
  60 void rl_prep_terminal(int);
  61 void rl_deprep_terminal(void);
  62
  63 /* for rl_complete() */
  64 #define TAB             '\r'
  65
  66 /* see comment at the #ifdef for sense of this */
  67 /* #define GDB_411_HACK */
  68
  69 /* readline compatibility stuff - look at readline sources/documentation */
  70 /* to see what these variables mean */
  71 const char *rl_library_version = "EditLine wrapper";
  72 int rl_readline_version = RL_READLINE_VERSION;
  73 static char empty[] = { '\0' };
  74 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  75 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  76     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  77 char *rl_readline_name = empty;
  78 FILE *rl_instream = NULL;
  79 FILE *rl_outstream = NULL;
  80 int rl_point = 0;
  81 int rl_end = 0;
  82 char *rl_line_buffer = NULL;
  83 VCPFunction *rl_linefunc = NULL;
  84 int rl_done = 0;
  85 VFunction *rl_event_hook = NULL;
  86 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  87     emacs_meta_keymap,
  88     emacs_ctlx_keymap;
  89 /*
  90  * The following is not implemented; we always catch signals in the
  91  * libedit fashion: set handlers on entry to el_gets() and clear them
  92  * on the way out. This simplistic approach works for most cases; if
  93  * it does not work for your application, please let us know.
  94  */
  95 int rl_catch_signals = 1;
  96 int rl_catch_sigwinch = 1;
  97
  98 int history_base = 1;           /* probably never subject to change */
  99 int history_length = 0;
 100 int max_input_history = 0;
 101 char history_expansion_char = '!';
 102 char history_subst_char = '^';
 103 char *history_no_expand_chars = expand_chars;
 104 Function *history_inhibit_expansion_function = NULL;
 105 char *history_arg_extract(int start, int end, const char *str);
 106
 107 int rl_inhibit_completion = 0;
 108 int rl_attempted_completion_over = 0;
 109 char *rl_basic_word_break_characters = break_chars;
 110 char *rl_completer_word_break_characters = NULL;
 111 char *rl_completer_quote_characters = NULL;
 112 Function *rl_completion_entry_function = NULL;
 113 char *(*rl_completion_word_break_hook)(void) = NULL;
 114 CPPFunction *rl_attempted_completion_function = NULL;
 115 Function *rl_pre_input_hook = NULL;
 116 Function *rl_startup1_hook = NULL;
 117 int (*rl_getc_function)(FILE *) = NULL;
 118 char *rl_terminal_name = NULL;
 119 int rl_already_prompted = 0;
 120 int rl_filename_completion_desired = 0;
 121 int rl_ignore_completion_duplicates = 0;
 122 int readline_echoing_p = 1;
 123 int _rl_print_completions_horizontally = 0;
 124 VFunction *rl_redisplay_function = NULL;
 125 Function *rl_startup_hook = NULL;
 126 VFunction *rl_completion_display_matches_hook = NULL;
 127 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 128 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 129 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 130
 131 /*
 132  * The current prompt string.
 133  */
 134 char *rl_prompt = NULL;
 135 /*
 136  * This is set to character indicating type of completion being done by
 137  * rl_complete_internal(); this is available for application completion
 138  * functions.
 139  */
 140 int rl_completion_type = 0;
 141
 142 /*
 143  * If more than this number of items results from query for possible
 144  * completions, we ask user if they are sure to really display the list.
 145  */
 146 int rl_completion_query_items = 100;
 147
 148 /*
 149  * List of characters which are word break characters, but should be left
 150  * in the parsed text when it is passed to the completion function.
 151  * Shell uses this to help determine what kind of completing to do.
 152  */
 153 char *rl_special_prefixes = NULL;
 154
 155 /*
 156  * This is the character appended to the completed words if at the end of
 157  * the line. Default is ' ' (a space).
 158  */
 159 int rl_completion_append_character = ' ';
 160
 161 /* stuff below is used internally by libedit for readline emulation */
 162
 163 static History *h = NULL;
 164 static EditLine *e = NULL;
 165 static Function *map[256];
 166 static jmp_buf topbuf;
 167
 168 /* internal functions */
 169 static unsigned char     _el_rl_complete(EditLine *, int);
 170 static unsigned char     _el_rl_tstp(EditLine *, int);
 171 static char             *_get_prompt(EditLine *);
 172 static int               _getc_function(EditLine *, char *);
 173 static HIST_ENTRY       *_move_history(int);
 174 static int               _history_expand_command(const char *, size_t, size_t,
 175     char **);
 176 static char             *_rl_compat_sub(const char *, const char *,
 177     const char *, int);
 178 static int               _rl_event_read_char(EditLine *, char *);
 179 static void              _rl_update_pos(void);
 180
 181
 182 /* ARGSUSED */
 183 static char *
 184 _get_prompt(EditLine *el __attribute__((__unused__)))
 185 {
 186         rl_already_prompted = 1;
 187         return rl_prompt;
 188 }
 189
 190
 191 /*
 192  * generic function for moving around history
 193  */
 194 static HIST_ENTRY *
 195 _move_history(int op)
 196 {
 197         HistEvent ev;
 198         static HIST_ENTRY rl_he;
 199
 200         if (history(h, &ev, op) != 0)
 201                 return NULL;
 202
 203         rl_he.line = ev.str;
 204         rl_he.data = NULL;
 205
 206         return &rl_he;
 207 }
 208
 209
 210 /*
 211  * read one key from user defined input function
 212  */
 213 static int
 214 /*ARGSUSED*/
 215 _getc_function(EditLine *el __attribute__((__unused__)), char *c)
 216 {
 217         int i;
 218
 219         i = (*rl_getc_function)(NULL);
 220         if (i == -1)
 221                 return 0;
 222         *c = (char)i;
 223         return 1;
 224 }
 225
 226 static void
 227 _resize_fun(EditLine *el, void *a)
 228 {
 229         const LineInfo *li;
 230         char **ap = a;
 231
 232         li = el_line(el);
 233         /* a cheesy way to get rid of const cast. */
 234         *ap = memchr(li->buffer, *li->buffer, (size_t)1);
 235 }
 236
 237 static const char *
 238 _default_history_file(void)
 239 {
 240         struct passwd *p;
 241         static char *path;
 242         size_t len;
 243
 244         if (path)
 245                 return path;
 246
 247         if ((p = getpwuid(getuid())) == NULL)
 248                 return NULL;
 249
 250         len = strlen(p->pw_dir) + sizeof("/.history");
 251         if ((path = malloc(len)) == NULL)
 252                 return NULL;
 253
 254         (void)snprintf(path, len, "%s/.history", p->pw_dir);
 255         return path;
 256 }
 257
 258 /*
 259  * READLINE compatibility stuff
 260  */
 261
 262 /*
 263  * Set the prompt
 264  */
 265 int
 266 rl_set_prompt(const char *prompt)
 267 {
 268         char *p;
 269
 270         if (!prompt)
 271                 prompt = "";
 272         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 273                 return 0;
 274         if (rl_prompt)
 275                 el_free(rl_prompt);
 276         rl_prompt = strdup(prompt);
 277         if (rl_prompt == NULL)
 278                 return -1;
 279
 280         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 281                 *p = RL_PROMPT_START_IGNORE;
 282
 283         return 0;
 284 }
 285
 286 /*
 287  * initialize rl compat stuff
 288  */
 289 int
 290 rl_initialize(void)
 291 {
 292         HistEvent ev;
 293         int editmode = 1;
 294         struct termios t;
 295
 296         if (e != NULL)
 297                 el_end(e);
 298         if (h != NULL)
 299                 history_end(h);
 300
 301         if (!rl_instream)
 302                 rl_instream = stdin;
 303         if (!rl_outstream)
 304                 rl_outstream = stdout;
 305
 306         /*
 307          * See if we don't really want to run the editor
 308          */
 309         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 310                 editmode = 0;
 311
 312         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 313
 314         if (!editmode)
 315                 el_set(e, EL_EDITMODE, 0);
 316
 317         h = history_init();
 318         if (!e || !h)
 319                 return -1;
 320
 321         history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
 322         history_length = 0;
 323         max_input_history = INT_MAX;
 324         el_set(e, EL_HIST, history, h);
 325
 326         /* Setup resize function */
 327         el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
 328
 329         /* setup getc function if valid */
 330         if (rl_getc_function)
 331                 el_set(e, EL_GETCFN, _getc_function);
 332
 333         /* for proper prompt printing in readline() */
 334         if (rl_set_prompt("") == -1) {
 335                 history_end(h);
 336                 el_end(e);
 337                 return -1;
 338         }
 339         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 340         el_set(e, EL_SIGNAL, rl_catch_signals);
 341
 342         /* set default mode to "emacs"-style and read setting afterwards */
 343         /* so this can be overridden */
 344         el_set(e, EL_EDITOR, "emacs");
 345         if (rl_terminal_name != NULL)
 346                 el_set(e, EL_TERMINAL, rl_terminal_name);
 347         else
 348                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 349
 350         /*
 351          * Word completion - this has to go AFTER rebinding keys
 352          * to emacs-style.
 353          */
 354         el_set(e, EL_ADDFN, "rl_complete",
 355             "ReadLine compatible completion function",
 356             _el_rl_complete);
 357         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 358
 359         /*
 360          * Send TSTP when ^Z is pressed.
 361          */
 362         el_set(e, EL_ADDFN, "rl_tstp",
 363             "ReadLine compatible suspend function",
 364             _el_rl_tstp);
 365         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 366
 367         /* read settings from configuration file */
 368         el_source(e, NULL);
 369
 370         /*
 371          * Unfortunately, some applications really do use rl_point
 372          * and rl_line_buffer directly.
 373          */
 374         _resize_fun(e, &rl_line_buffer);
 375         _rl_update_pos();
 376
 377         if (rl_startup_hook)
 378                 (*rl_startup_hook)(NULL, 0);
 379
 380         return 0;
 381 }
 382
 383
 384 /*
 385  * read one line from input stream and return it, chomping
 386  * trailing newline (if there is any)
 387  */
 388 char *
 389 readline(const char *p)
 390 {
 391         HistEvent ev;
 392         const char * volatile prompt = p;
 393         int count;
 394         const char *ret;
 395         char *buf;
 396         static int used_event_hook;
 397
 398         if (e == NULL || h == NULL)
 399                 rl_initialize();
 400
 401         rl_done = 0;
 402
 403         (void)setjmp(topbuf);
 404
 405         /* update prompt accordingly to what has been passed */
 406         if (rl_set_prompt(prompt) == -1)
 407                 return NULL;
 408
 409         if (rl_pre_input_hook)
 410                 (*rl_pre_input_hook)(NULL, 0);
 411
 412         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 413                 el_set(e, EL_GETCFN, _rl_event_read_char);
 414                 used_event_hook = 1;
 415         }
 416
 417         if (!rl_event_hook && used_event_hook) {
 418                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 419                 used_event_hook = 0;
 420         }
 421
 422         rl_already_prompted = 0;
 423
 424         /* get one line from input stream */
 425         ret = el_gets(e, &count);
 426
 427         if (ret && count > 0) {
 428                 int lastidx;
 429
 430                 buf = strdup(ret);
 431                 if (buf == NULL)
 432                         return NULL;
 433                 lastidx = count - 1;
 434                 if (buf[lastidx] == '\n')
 435                         buf[lastidx] = '\0';
 436         } else
 437                 buf = NULL;
 438
 439         history(h, &ev, H_GETSIZE);
 440         history_length = ev.num;
 441
 442         return buf;
 443 }
 444
 445 /*
 446  * history functions
 447  */
 448
 449 /*
 450  * is normally called before application starts to use
 451  * history expansion functions
 452  */
 453 void
 454 using_history(void)
 455 {
 456         if (h == NULL || e == NULL)
 457                 rl_initialize();
 458 }
 459
 460
 461 /*
 462  * substitute ``what'' with ``with'', returning resulting string; if
 463  * globally == 1, substitutes all occurrences of what, otherwise only the
 464  * first one
 465  */
 466 static char *
 467 _rl_compat_sub(const char *str, const char *what, const char *with,
 468     int globally)
 469 {
 470         const   char    *s;
 471         char    *r, *result;
 472         size_t  len, with_len, what_len;
 473
 474         len = strlen(str);
 475         with_len = strlen(with);
 476         what_len = strlen(what);
 477
 478         /* calculate length we need for result */
 479         s = str;
 480         while (*s) {
 481                 if (*s == *what && !strncmp(s, what, what_len)) {
 482                         len += with_len - what_len;
 483                         if (!globally)
 484                                 break;
 485                         s += what_len;
 486                 } else
 487                         s++;
 488         }
 489         r = result = el_malloc((len + 1) * sizeof(*r));
 490         if (result == NULL)
 491                 return NULL;
 492         s = str;
 493         while (*s) {
 494                 if (*s == *what && !strncmp(s, what, what_len)) {
 495                         (void)strncpy(r, with, with_len);
 496                         r += with_len;
 497                         s += what_len;
 498                         if (!globally) {
 499                                 (void)strcpy(r, s);
 500                                 return result;
 501                         }
 502                 } else
 503                         *r++ = *s++;
 504         }
 505         *r = '\0';
 506         return result;
 507 }
 508
 509 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 510 static  char    *last_search_match;     /* last !?pat[?] that matched */
 511
 512 const char *
 513 get_history_event(const char *cmd, int *cindex, int qchar)
 514 {
 515         int idx, sign, sub, num, begin, ret;
 516         size_t len;
 517         char    *pat;
 518         const char *rptr;
 519         HistEvent ev;
 520
 521         idx = *cindex;
 522         if (cmd[idx++] != history_expansion_char)
 523                 return NULL;
 524
 525         /* find out which event to take */
 526         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 527                 if (history(h, &ev, H_FIRST) != 0)
 528                         return NULL;
 529                 *cindex = cmd[idx]? (idx + 1):idx;
 530                 return ev.str;
 531         }
 532         sign = 0;
 533         if (cmd[idx] == '-') {
 534                 sign = 1;
 535                 idx++;
 536         }
 537
 538         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 539                 HIST_ENTRY *rl_he;
 540
 541                 num = 0;
 542                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 543                         num = num * 10 + cmd[idx] - '0';
 544                         idx++;
 545                 }
 546                 if (sign)
 547                         num = history_length - num + 1;
 548
 549                 if (!(rl_he = history_get(num)))
 550                         return NULL;
 551
 552                 *cindex = idx;
 553                 return rl_he->line;
 554         }
 555         sub = 0;
 556         if (cmd[idx] == '?') {
 557                 sub = 1;
 558                 idx++;
 559         }
 560         begin = idx;
 561         while (cmd[idx]) {
 562                 if (cmd[idx] == '\n')
 563                         break;
 564                 if (sub && cmd[idx] == '?')
 565                         break;
 566                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 567                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 568                         break;
 569                 idx++;
 570         }
 571         len = (size_t)idx - (size_t)begin;
 572         if (sub && cmd[idx] == '?')
 573                 idx++;
 574         if (sub && len == 0 && last_search_pat && *last_search_pat)
 575                 pat = last_search_pat;
 576         else if (len == 0)
 577                 return NULL;
 578         else {
 579                 if ((pat = el_malloc((len + 1) * sizeof(*pat))) == NULL)
 580                         return NULL;
 581                 (void)strncpy(pat, cmd + begin, len);
 582                 pat[len] = '\0';
 583         }
 584
 585         if (history(h, &ev, H_CURR) != 0) {
 586                 if (pat != last_search_pat)
 587                         el_free(pat);
 588                 return NULL;
 589         }
 590         num = ev.num;
 591
 592         if (sub) {
 593                 if (pat != last_search_pat) {
 594                         if (last_search_pat)
 595                                 el_free(last_search_pat);
 596                         last_search_pat = pat;
 597                 }
 598                 ret = history_search(pat, -1);
 599         } else
 600                 ret = history_search_prefix(pat, -1);
 601
 602         if (ret == -1) {
 603                 /* restore to end of list on failed search */
 604                 history(h, &ev, H_FIRST);
 605                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 606                 if (pat != last_search_pat)
 607                         el_free(pat);
 608                 return NULL;
 609         }
 610
 611         if (sub && len) {
 612                 if (last_search_match && last_search_match != pat)
 613                         el_free(last_search_match);
 614                 last_search_match = pat;
 615         }
 616
 617         if (pat != last_search_pat)
 618                 el_free(pat);
 619
 620         if (history(h, &ev, H_CURR) != 0)
 621                 return NULL;
 622         *cindex = idx;
 623         rptr = ev.str;
 624
 625         /* roll back to original position */
 626         (void)history(h, &ev, H_SET, num);
 627
 628         return rptr;
 629 }
 630
 631 /*
 632  * the real function doing history expansion - takes as argument command
 633  * to do and data upon which the command should be executed
 634  * does expansion the way I've understood readline documentation
 635  *
 636  * returns 0 if data was not modified, 1 if it was and 2 if the string
 637  * should be only printed and not executed; in case of error,
 638  * returns -1 and *result points to NULL
 639  * it's the caller's responsibility to free() the string returned in *result
 640  */
 641 static int
 642 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 643     char **result)
 644 {
 645         char *tmp, *search = NULL, *aptr;
 646         const char *ptr, *cmd;
 647         static char *from = NULL, *to = NULL;
 648         int start, end, idx, has_mods = 0;
 649         int p_on = 0, g_on = 0;
 650
 651         *result = NULL;
 652         aptr = NULL;
 653         ptr = NULL;
 654
 655         /* First get event specifier */
 656         idx = 0;
 657
 658         if (strchr(":^*$", command[offs + 1])) {
 659                 char str[4];
 660                 /*
 661                 * "!:" is shorthand for "!!:".
 662                 * "!^", "!*" and "!$" are shorthand for
 663                 * "!!:^", "!!:*" and "!!:$" respectively.
 664                 */
 665                 str[0] = str[1] = '!';
 666                 str[2] = '0';
 667                 ptr = get_history_event(str, &idx, 0);
 668                 idx = (command[offs + 1] == ':')? 1:0;
 669                 has_mods = 1;
 670         } else {
 671                 if (command[offs + 1] == '#') {
 672                         /* use command so far */
 673                         if ((aptr = el_malloc((offs + 1) * sizeof(*aptr)))
 674                             == NULL)
 675                                 return -1;
 676                         (void)strncpy(aptr, command, offs);
 677                         aptr[offs] = '\0';
 678                         idx = 1;
 679                 } else {
 680                         int     qchar;
 681
 682                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 683                         ptr = get_history_event(command + offs, &idx, qchar);
 684                 }
 685                 has_mods = command[offs + (size_t)idx] == ':';
 686         }
 687
 688         if (ptr == NULL && aptr == NULL)
 689                 return -1;
 690
 691         if (!has_mods) {
 692                 *result = strdup(aptr ? aptr : ptr);
 693                 if (aptr)
 694                         el_free(aptr);
 695                 if (*result == NULL)
 696                         return -1;
 697                 return 1;
 698         }
 699
 700         cmd = command + offs + idx + 1;
 701
 702         /* Now parse any word designators */
 703
 704         if (*cmd == '%')        /* last word matched by ?pat? */
 705                 tmp = strdup(last_search_match? last_search_match:"");
 706         else if (strchr("^*$-0123456789", *cmd)) {
 707                 start = end = -1;
 708                 if (*cmd == '^')
 709                         start = end = 1, cmd++;
 710                 else if (*cmd == '$')
 711                         start = -1, cmd++;
 712                 else if (*cmd == '*')
 713                         start = 1, cmd++;
 714                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 715                         start = 0;
 716                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 717                                 start = start * 10 + *cmd++ - '0';
 718
 719                         if (*cmd == '-') {
 720                                 if (isdigit((unsigned char) cmd[1])) {
 721                                         cmd++;
 722                                         end = 0;
 723                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 724                                                 end = end * 10 + *cmd++ - '0';
 725                                 } else if (cmd[1] == '$') {
 726                                         cmd += 2;
 727                                         end = -1;
 728                                 } else {
 729                                         cmd++;
 730                                         end = -2;
 731                                 }
 732                         } else if (*cmd == '*')
 733                                 end = -1, cmd++;
 734                         else
 735                                 end = start;
 736                 }
 737                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 738                 if (tmp == NULL) {
 739                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 740                             command + offs + idx);
 741                         if (aptr)
 742                                 el_free(aptr);
 743                         return -1;
 744                 }
 745         } else
 746                 tmp = strdup(aptr? aptr:ptr);
 747
 748         if (aptr)
 749                 el_free(aptr);
 750
 751         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 752                 *result = tmp;
 753                 return 1;
 754         }
 755
 756         for (; *cmd; cmd++) {
 757                 if (*cmd == ':')
 758                         continue;
 759                 else if (*cmd == 'h') {         /* remove trailing path */
 760                         if ((aptr = strrchr(tmp, '/')) != NULL)
 761                                 *aptr = '\0';
 762                 } else if (*cmd == 't') {       /* remove leading path */
 763                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 764                                 aptr = strdup(aptr + 1);
 765                                 el_free(tmp);
 766                                 tmp = aptr;
 767                         }
 768                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 769                         if ((aptr = strrchr(tmp, '.')) != NULL)
 770                                 *aptr = '\0';
 771                 } else if (*cmd == 'e') {       /* remove all but suffix */
 772                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 773                                 aptr = strdup(aptr);
 774                                 el_free(tmp);
 775                                 tmp = aptr;
 776                         }
 777                 } else if (*cmd == 'p')         /* print only */
 778                         p_on = 1;
 779                 else if (*cmd == 'g')
 780                         g_on = 2;
 781                 else if (*cmd == 's' || *cmd == '&') {
 782                         char *what, *with, delim;
 783                         size_t len, from_len;
 784                         size_t size;
 785
 786                         if (*cmd == '&' && (from == NULL || to == NULL))
 787                                 continue;
 788                         else if (*cmd == 's') {
 789                                 delim = *(++cmd), cmd++;
 790                                 size = 16;
 791                                 what = el_realloc(from, size * sizeof(*what));
 792                                 if (what == NULL) {
 793                                         el_free(from);
 794                                         el_free(tmp);
 795                                         return 0;
 796                                 }
 797                                 len = 0;
 798                                 for (; *cmd && *cmd != delim; cmd++) {
 799                                         if (*cmd == '\\' && cmd[1] == delim)
 800                                                 cmd++;
 801                                         if (len >= size) {
 802                                                 char *nwhat;
 803                                                 nwhat = el_realloc(what,
 804                                                     (size <<= 1) *
 805                                                     sizeof(*nwhat));
 806                                                 if (nwhat == NULL) {
 807                                                         el_free(what);
 808                                                         el_free(tmp);
 809                                                         return 0;
 810                                                 }
 811                                                 what = nwhat;
 812                                         }
 813                                         what[len++] = *cmd;
 814                                 }
 815                                 what[len] = '\0';
 816                                 from = what;
 817                                 if (*what == '\0') {
 818                                         el_free(what);
 819                                         if (search) {
 820                                                 from = strdup(search);
 821                                                 if (from == NULL) {
 822                                                         el_free(tmp);
 823                                                         return 0;
 824                                                 }
 825                                         } else {
 826                                                 from = NULL;
 827                                                 el_free(tmp);
 828                                                 return -1;
 829                                         }
 830                                 }
 831                                 cmd++;  /* shift after delim */
 832                                 if (!*cmd)
 833                                         continue;
 834
 835                                 size = 16;
 836                                 with = el_realloc(to, size * sizeof(*with));
 837                                 if (with == NULL) {
 838                                         el_free(to);
 839                                         el_free(tmp);
 840                                         return -1;
 841                                 }
 842                                 len = 0;
 843                                 from_len = strlen(from);
 844                                 for (; *cmd && *cmd != delim; cmd++) {
 845                                         if (len + from_len + 1 >= size) {
 846                                                 char *nwith;
 847                                                 size += from_len + 1;
 848                                                 nwith = el_realloc(with,
 849                                                     size * sizeof(*nwith));
 850                                                 if (nwith == NULL) {
 851                                                         el_free(with);
 852                                                         el_free(tmp);
 853                                                         return -1;
 854                                                 }
 855                                                 with = nwith;
 856                                         }
 857                                         if (*cmd == '&') {
 858                                                 /* safe */
 859                                                 (void)strcpy(&with[len], from);
 860                                                 len += from_len;
 861                                                 continue;
 862                                         }
 863                                         if (*cmd == '\\'
 864                                             && (*(cmd + 1) == delim
 865                                                 || *(cmd + 1) == '&'))
 866                                                 cmd++;
 867                                         with[len++] = *cmd;
 868                                 }
 869                                 with[len] = '\0';
 870                                 to = with;
 871                         }
 872
 873                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 874                         if (aptr) {
 875                                 el_free(tmp);
 876                                 tmp = aptr;
 877                         }
 878                         g_on = 0;
 879                 }
 880         }
 881         *result = tmp;
 882         return p_on? 2:1;
 883 }
 884
 885
 886 /*
 887  * csh-style history expansion
 888  */
 889 int
 890 history_expand(char *str, char **output)
 891 {
 892         int ret = 0;
 893         size_t idx, i, size;
 894         char *tmp, *result;
 895
 896         if (h == NULL || e == NULL)
 897                 rl_initialize();
 898
 899         if (history_expansion_char == 0) {
 900                 *output = strdup(str);
 901                 return 0;
 902         }
 903
 904         *output = NULL;
 905         if (str[0] == history_subst_char) {
 906                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 907                 *output = el_malloc((strlen(str) + 4 + 1) * sizeof(**output));
 908                 if (*output == NULL)
 909                         return 0;
 910                 (*output)[0] = (*output)[1] = history_expansion_char;
 911                 (*output)[2] = ':';
 912                 (*output)[3] = 's';
 913                 (void)strcpy((*output) + 4, str);
 914                 str = *output;
 915         } else {
 916                 *output = strdup(str);
 917                 if (*output == NULL)
 918                         return 0;
 919         }
 920
 921 #define ADD_STRING(what, len, fr)                                       \
 922         {                                                               \
 923                 if (idx + len + 1 > size) {                             \
 924                         char *nresult = el_realloc(result,              \
 925                             (size += len + 1) * sizeof(*nresult));      \
 926                         if (nresult == NULL) {                          \
 927                                 el_free(*output);                       \
 928                                 if (/*CONSTCOND*/fr)                    \
 929                                         el_free(tmp);                   \
 930                                 return 0;                               \
 931                         }                                               \
 932                         result = nresult;                               \
 933                 }                                                       \
 934                 (void)strncpy(&result[idx], what, len);                 \
 935                 idx += len;                                             \
 936                 result[idx] = '\0';                                     \
 937         }
 938
 939         result = NULL;
 940         size = idx = 0;
 941         tmp = NULL;
 942         for (i = 0; str[i];) {
 943                 int qchar, loop_again;
 944                 size_t len, start, j;
 945
 946                 qchar = 0;
 947                 loop_again = 1;
 948                 start = j = i;
 949 loop:
 950                 for (; str[j]; j++) {
 951                         if (str[j] == '\\' &&
 952                             str[j + 1] == history_expansion_char) {
 953                                 (void)strcpy(&str[j], &str[j + 1]);
 954                                 continue;
 955                         }
 956                         if (!loop_again) {
 957                                 if (isspace((unsigned char) str[j])
 958                                     || str[j] == qchar)
 959                                         break;
 960                         }
 961                         if (str[j] == history_expansion_char
 962                             && !strchr(history_no_expand_chars, str[j + 1])
 963                             && (!history_inhibit_expansion_function ||
 964                             (*history_inhibit_expansion_function)(str,
 965                             (int)j) == 0))
 966                                 break;
 967                 }
 968
 969                 if (str[j] && loop_again) {
 970                         i = j;
 971                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
 972                         j++;
 973                         if (str[j] == history_expansion_char)
 974                                 j++;
 975                         loop_again = 0;
 976                         goto loop;
 977                 }
 978                 len = i - start;
 979                 ADD_STRING(&str[start], len, 0);
 980
 981                 if (str[i] == '\0' || str[i] != history_expansion_char) {
 982                         len = j - i;
 983                         ADD_STRING(&str[i], len, 0);
 984                         if (start == 0)
 985                                 ret = 0;
 986                         else
 987                                 ret = 1;
 988                         break;
 989                 }
 990                 ret = _history_expand_command (str, i, (j - i), &tmp);
 991                 if (ret > 0 && tmp) {
 992                         len = strlen(tmp);
 993                         ADD_STRING(tmp, len, 1);
 994                 }
 995                 if (tmp) {
 996                         el_free(tmp);
 997                         tmp = NULL;
 998                 }
 999                 i = j;
1000         }
1001
1002         /* ret is 2 for "print only" option */
1003         if (ret == 2) {
1004                 add_history(result);
1005 #ifdef GDB_411_HACK
1006                 /* gdb 4.11 has been shipped with readline, where */
1007                 /* history_expand() returned -1 when the line     */
1008                 /* should not be executed; in readline 2.1+       */
1009                 /* it should return 2 in such a case              */
1010                 ret = -1;
1011 #endif
1012         }
1013         el_free(*output);
1014         *output = result;
1015
1016         return ret;
1017 }
1018
1019 /*
1020 * Return a string consisting of arguments of "str" from "start" to "end".
1021 */
1022 char *
1023 history_arg_extract(int start, int end, const char *str)
1024 {
1025         size_t  i, len, max;
1026         char    **arr, *result = NULL;
1027
1028         arr = history_tokenize(str);
1029         if (!arr)
1030                 return NULL;
1031         if (arr && *arr == NULL)
1032                 goto out;
1033
1034         for (max = 0; arr[max]; max++)
1035                 continue;
1036         max--;
1037
1038         if (start == '$')
1039                 start = (int)max;
1040         if (end == '$')
1041                 end = (int)max;
1042         if (end < 0)
1043                 end = (int)max + end + 1;
1044         if (start < 0)
1045                 start = end;
1046
1047         if (start < 0 || end < 0 || (size_t)start > max ||
1048             (size_t)end > max || start > end)
1049                 goto out;
1050
1051         for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1052                 len += strlen(arr[i]) + 1;
1053         len++;
1054         result = el_malloc(len * sizeof(*result));
1055         if (result == NULL)
1056                 goto out;
1057
1058         for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1059                 (void)strcpy(result + len, arr[i]);
1060                 len += strlen(arr[i]);
1061                 if (i < (size_t)end)
1062                         result[len++] = ' ';
1063         }
1064         result[len] = '\0';
1065
1066 out:
1067         for (i = 0; arr[i]; i++)
1068                 el_free(arr[i]);
1069         el_free(arr);
1070
1071         return result;
1072 }
1073
1074 /*
1075  * Parse the string into individual tokens,
1076  * similar to how shell would do it.
1077  */
1078 char **
1079 history_tokenize(const char *str)
1080 {
1081         int size = 1, idx = 0, i, start;
1082         size_t len;
1083         char **result = NULL, *temp, delim = '\0';
1084
1085         for (i = 0; str[i];) {
1086                 while (isspace((unsigned char) str[i]))
1087                         i++;
1088                 start = i;
1089                 for (; str[i];) {
1090                         if (str[i] == '\\') {
1091                                 if (str[i+1] != '\0')
1092                                         i++;
1093                         } else if (str[i] == delim)
1094                                 delim = '\0';
1095                         else if (!delim &&
1096                                     (isspace((unsigned char) str[i]) ||
1097                                 strchr("()<>;&|$", str[i])))
1098                                 break;
1099                         else if (!delim && strchr("'`\"", str[i]))
1100                                 delim = str[i];
1101                         if (str[i])
1102                                 i++;
1103                 }
1104
1105                 if (idx + 2 >= size) {
1106                         char **nresult;
1107                         size <<= 1;
1108                         nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1109                         if (nresult == NULL) {
1110                                 el_free(result);
1111                                 return NULL;
1112                         }
1113                         result = nresult;
1114                 }
1115                 len = (size_t)i - (size_t)start;
1116                 temp = el_malloc((size_t)(len + 1) * sizeof(*temp));
1117                 if (temp == NULL) {
1118                         for (i = 0; i < idx; i++)
1119                                 el_free(result[i]);
1120                         el_free(result);
1121                         return NULL;
1122                 }
1123                 (void)strncpy(temp, &str[start], len);
1124                 temp[len] = '\0';
1125                 result[idx++] = temp;
1126                 result[idx] = NULL;
1127                 if (str[i])
1128                         i++;
1129         }
1130         return result;
1131 }
1132
1133
1134 /*
1135  * limit size of history record to ``max'' events
1136  */
1137 void
1138 stifle_history(int max)
1139 {
1140         HistEvent ev;
1141
1142         if (h == NULL || e == NULL)
1143                 rl_initialize();
1144
1145         if (history(h, &ev, H_SETSIZE, max) == 0)
1146                 max_input_history = max;
1147 }
1148
1149
1150 /*
1151  * "unlimit" size of history - set the limit to maximum allowed int value
1152  */
1153 int
1154 unstifle_history(void)
1155 {
1156         HistEvent ev;
1157         int omax;
1158
1159         history(h, &ev, H_SETSIZE, INT_MAX);
1160         omax = max_input_history;
1161         max_input_history = INT_MAX;
1162         return omax;            /* some value _must_ be returned */
1163 }
1164
1165
1166 int
1167 history_is_stifled(void)
1168 {
1169
1170         /* cannot return true answer */
1171         return max_input_history != INT_MAX;
1172 }
1173
1174 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1175
1176 int
1177 history_truncate_file (const char *filename, int nlines)
1178 {
1179         int ret = 0;
1180         FILE *fp, *tp;
1181         char template[sizeof(_history_tmp_template)];
1182         char buf[4096];
1183         int fd;
1184         char *cp;
1185         off_t off;
1186         int count = 0;
1187         ssize_t left = 0;
1188
1189         if (filename == NULL && (filename = _default_history_file()) == NULL)
1190                 return errno;
1191         if ((fp = fopen(filename, "r+")) == NULL)
1192                 return errno;
1193         strcpy(template, _history_tmp_template);
1194         if ((fd = mkstemp(template)) == -1) {
1195                 ret = errno;
1196                 goto out1;
1197         }
1198
1199         if ((tp = fdopen(fd, "r+")) == NULL) {
1200                 close(fd);
1201                 ret = errno;
1202                 goto out2;
1203         }
1204
1205         for(;;) {
1206                 if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1207                         if (ferror(fp)) {
1208                                 ret = errno;
1209                                 break;
1210                         }
1211                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1212                             (off_t)-1) {
1213                                 ret = errno;
1214                                 break;
1215                         }
1216                         left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1217                         if (ferror(fp)) {
1218                                 ret = errno;
1219                                 break;
1220                         }
1221                         if (left == 0) {
1222                                 count--;
1223                                 left = sizeof(buf);
1224                         } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1225                             != 1) {
1226                                 ret = errno;
1227                                 break;
1228                         }
1229                         fflush(tp);
1230                         break;
1231                 }
1232                 if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1233                         ret = errno;
1234                         break;
1235                 }
1236                 count++;
1237         }
1238         if (ret)
1239                 goto out3;
1240         cp = buf + left - 1;
1241         if(*cp != '\n')
1242                 cp++;
1243         for(;;) {
1244                 while (--cp >= buf) {
1245                         if (*cp == '\n') {
1246                                 if (--nlines == 0) {
1247                                         if (++cp >= buf + sizeof(buf)) {
1248                                                 count++;
1249                                                 cp = buf;
1250                                         }
1251                                         break;
1252                                 }
1253                         }
1254                 }
1255                 if (nlines <= 0 || count == 0)
1256                         break;
1257                 count--;
1258                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1259                         ret = errno;
1260                         break;
1261                 }
1262                 if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1263                         if (ferror(tp)) {
1264                                 ret = errno;
1265                                 break;
1266                         }
1267                         ret = EAGAIN;
1268                         break;
1269                 }
1270                 cp = buf + sizeof(buf);
1271         }
1272
1273         if (ret || nlines > 0)
1274                 goto out3;
1275
1276         if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1277                 ret = errno;
1278                 goto out3;
1279         }
1280
1281         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1282             (off_t)-1) {
1283                 ret = errno;
1284                 goto out3;
1285         }
1286
1287         for(;;) {
1288                 if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1289                         if (ferror(fp))
1290                                 ret = errno;
1291                         break;
1292                 }
1293                 if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1294                         ret = errno;
1295                         break;
1296                 }
1297         }
1298         fflush(fp);
1299         if((off = ftello(fp)) > 0)
1300                 (void)ftruncate(fileno(fp), off);
1301 out3:
1302         fclose(tp);
1303 out2:
1304         unlink(template);
1305 out1:
1306         fclose(fp);
1307
1308         return ret;
1309 }
1310
1311
1312 /*
1313  * read history from a file given
1314  */
1315 int
1316 read_history(const char *filename)
1317 {
1318         HistEvent ev;
1319
1320         if (h == NULL || e == NULL)
1321                 rl_initialize();
1322         if (filename == NULL && (filename = _default_history_file()) == NULL)
1323                 return errno;
1324         return history(h, &ev, H_LOAD, filename) == -1 ?
1325             (errno ? errno : EINVAL) : 0;
1326 }
1327
1328
1329 /*
1330  * write history to a file given
1331  */
1332 int
1333 write_history(const char *filename)
1334 {
1335         HistEvent ev;
1336
1337         if (h == NULL || e == NULL)
1338                 rl_initialize();
1339         if (filename == NULL && (filename = _default_history_file()) == NULL)
1340                 return errno;
1341         return history(h, &ev, H_SAVE, filename) == -1 ?
1342             (errno ? errno : EINVAL) : 0;
1343 }
1344
1345
1346 /*
1347  * returns history ``num''th event
1348  *
1349  * returned pointer points to static variable
1350  */
1351 HIST_ENTRY *
1352 history_get(int num)
1353 {
1354         static HIST_ENTRY she;
1355         HistEvent ev;
1356         int curr_num;
1357
1358         if (h == NULL || e == NULL)
1359                 rl_initialize();
1360
1361         /* save current position */
1362         if (history(h, &ev, H_CURR) != 0)
1363                 return NULL;
1364         curr_num = ev.num;
1365
1366         /* start from the oldest */
1367         if (history(h, &ev, H_LAST) != 0)
1368                 return NULL;    /* error */
1369
1370         /* look forwards for event matching specified offset */
1371         if (history(h, &ev, H_NEXT_EVDATA, num, &she.data))
1372                 return NULL;
1373
1374         she.line = ev.str;
1375
1376         /* restore pointer to where it was */
1377         (void)history(h, &ev, H_SET, curr_num);
1378
1379         return &she;
1380 }
1381
1382
1383 /*
1384  * add the line to history table
1385  */
1386 int
1387 add_history(const char *line)
1388 {
1389         HistEvent ev;
1390
1391         if (line == NULL)
1392                 return 0;
1393
1394         if (h == NULL || e == NULL)
1395                 rl_initialize();
1396
1397         (void)history(h, &ev, H_ENTER, line);
1398         if (history(h, &ev, H_GETSIZE) == 0)
1399                 history_length = ev.num;
1400
1401         return !(history_length > 0); /* return 0 if all is okay */
1402 }
1403
1404
1405 /*
1406  * remove the specified entry from the history list and return it.
1407  */
1408 HIST_ENTRY *
1409 remove_history(int num)
1410 {
1411         HIST_ENTRY *he;
1412         HistEvent ev;
1413
1414         if (h == NULL || e == NULL)
1415                 rl_initialize();
1416
1417         if ((he = el_malloc(sizeof(*he))) == NULL)
1418                 return NULL;
1419
1420         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1421                 el_free(he);
1422                 return NULL;
1423         }
1424
1425         he->line = ev.str;
1426         if (history(h, &ev, H_GETSIZE) == 0)
1427                 history_length = ev.num;
1428
1429         return he;
1430 }
1431
1432
1433 /*
1434  * replace the line and data of the num-th entry
1435  */
1436 HIST_ENTRY *
1437 replace_history_entry(int num, const char *line, histdata_t data)
1438 {
1439         HIST_ENTRY *he;
1440         HistEvent ev;
1441         int curr_num;
1442
1443         if (h == NULL || e == NULL)
1444                 rl_initialize();
1445
1446         /* save current position */
1447         if (history(h, &ev, H_CURR) != 0)
1448                 return NULL;
1449         curr_num = ev.num;
1450
1451         /* start from the oldest */
1452         if (history(h, &ev, H_LAST) != 0)
1453                 return NULL;    /* error */
1454
1455         if ((he = el_malloc(sizeof(*he))) == NULL)
1456                 return NULL;
1457
1458         /* look forwards for event matching specified offset */
1459         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1460                 goto out;
1461
1462         he->line = strdup(ev.str);
1463         if (he->line == NULL)
1464                 goto out;
1465
1466         if (history(h, &ev, H_REPLACE, line, data))
1467                 goto out;
1468
1469         /* restore pointer to where it was */
1470         if (history(h, &ev, H_SET, curr_num))
1471                 goto out;
1472
1473         return he;
1474 out:
1475         el_free(he);
1476         return NULL;
1477 }
1478
1479 /*
1480  * clear the history list - delete all entries
1481  */
1482 void
1483 clear_history(void)
1484 {
1485         HistEvent ev;
1486
1487         if (h == NULL || e == NULL)
1488                 rl_initialize();
1489
1490         (void)history(h, &ev, H_CLEAR);
1491         history_length = 0;
1492 }
1493
1494
1495 /*
1496  * returns offset of the current history event
1497  */
1498 int
1499 where_history(void)
1500 {
1501         HistEvent ev;
1502         int curr_num, off;
1503
1504         if (history(h, &ev, H_CURR) != 0)
1505                 return 0;
1506         curr_num = ev.num;
1507
1508         (void)history(h, &ev, H_FIRST);
1509         off = 1;
1510         while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1511                 off++;
1512
1513         return off;
1514 }
1515
1516
1517 /*
1518  * returns current history event or NULL if there is no such event
1519  */
1520 HIST_ENTRY *
1521 current_history(void)
1522 {
1523
1524         return _move_history(H_CURR);
1525 }
1526
1527
1528 /*
1529  * returns total number of bytes history events' data are using
1530  */
1531 int
1532 history_total_bytes(void)
1533 {
1534         HistEvent ev;
1535         int curr_num;
1536         size_t size;
1537
1538         if (history(h, &ev, H_CURR) != 0)
1539                 return -1;
1540         curr_num = ev.num;
1541
1542         (void)history(h, &ev, H_FIRST);
1543         size = 0;
1544         do
1545                 size += strlen(ev.str) * sizeof(*ev.str);
1546         while (history(h, &ev, H_NEXT) == 0);
1547
1548         /* get to the same position as before */
1549         history(h, &ev, H_PREV_EVENT, curr_num);
1550
1551         return (int)size;
1552 }
1553
1554
1555 /*
1556  * sets the position in the history list to ``pos''
1557  */
1558 int
1559 history_set_pos(int pos)
1560 {
1561         HistEvent ev;
1562         int curr_num;
1563
1564         if (pos >= history_length || pos < 0)
1565                 return -1;
1566
1567         (void)history(h, &ev, H_CURR);
1568         curr_num = ev.num;
1569
1570         /*
1571          * use H_DELDATA to set to nth history (without delete) by passing
1572          * (void **)-1
1573          */
1574         if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1575                 (void)history(h, &ev, H_SET, curr_num);
1576                 return -1;
1577         }
1578         return 0;
1579 }
1580
1581
1582 /*
1583  * returns previous event in history and shifts pointer accordingly
1584  */
1585 HIST_ENTRY *
1586 previous_history(void)
1587 {
1588
1589         return _move_history(H_PREV);
1590 }
1591
1592
1593 /*
1594  * returns next event in history and shifts pointer accordingly
1595  */
1596 HIST_ENTRY *
1597 next_history(void)
1598 {
1599
1600         return _move_history(H_NEXT);
1601 }
1602
1603
1604 /*
1605  * searches for first history event containing the str
1606  */
1607 int
1608 history_search(const char *str, int direction)
1609 {
1610         HistEvent ev;
1611         const char *strp;
1612         int curr_num;
1613
1614         if (history(h, &ev, H_CURR) != 0)
1615                 return -1;
1616         curr_num = ev.num;
1617
1618         for (;;) {
1619                 if ((strp = strstr(ev.str, str)) != NULL)
1620                         return (int)(strp - ev.str);
1621                 if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1622                         break;
1623         }
1624         (void)history(h, &ev, H_SET, curr_num);
1625         return -1;
1626 }
1627
1628
1629 /*
1630  * searches for first history event beginning with str
1631  */
1632 int
1633 history_search_prefix(const char *str, int direction)
1634 {
1635         HistEvent ev;
1636
1637         return (history(h, &ev, direction < 0 ?
1638             H_PREV_STR : H_NEXT_STR, str));
1639 }
1640
1641
1642 /*
1643  * search for event in history containing str, starting at offset
1644  * abs(pos); continue backward, if pos<0, forward otherwise
1645  */
1646 /* ARGSUSED */
1647 int
1648 history_search_pos(const char *str,
1649                    int direction __attribute__((__unused__)), int pos)
1650 {
1651         HistEvent ev;
1652         int curr_num, off;
1653
1654         off = (pos > 0) ? pos : -pos;
1655         pos = (pos > 0) ? 1 : -1;
1656
1657         if (history(h, &ev, H_CURR) != 0)
1658                 return -1;
1659         curr_num = ev.num;
1660
1661         if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1662                 return -1;
1663
1664         for (;;) {
1665                 if (strstr(ev.str, str))
1666                         return off;
1667                 if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1668                         break;
1669         }
1670
1671         /* set "current" pointer back to previous state */
1672         (void)history(h, &ev,
1673             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1674
1675         return -1;
1676 }
1677
1678
1679 /********************************/
1680 /* completion functions */
1681
1682 char *
1683 tilde_expand(char *name)
1684 {
1685         return fn_tilde_expand(name);
1686 }
1687
1688 char *
1689 filename_completion_function(const char *name, int state)
1690 {
1691         return fn_filename_completion_function(name, state);
1692 }
1693
1694 /*
1695  * a completion generator for usernames; returns _first_ username
1696  * which starts with supplied text
1697  * text contains a partial username preceded by random character
1698  * (usually '~'); state resets search from start (??? should we do that anyway)
1699  * it's the caller's responsibility to free the returned value
1700  */
1701 char *
1702 username_completion_function(const char *text, int state)
1703 {
1704 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1705         struct passwd pwres;
1706         char pwbuf[1024];
1707 #endif
1708         struct passwd *pass = NULL;
1709
1710         if (text[0] == '\0')
1711                 return NULL;
1712
1713         if (*text == '~')
1714                 text++;
1715
1716         if (state == 0)
1717                 setpwent();
1718
1719         while (
1720 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1721             getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pass) == 0 && pass != NULL
1722 #else
1723             (pass = getpwent()) != NULL
1724 #endif
1725             && text[0] == pass->pw_name[0]
1726             && strcmp(text, pass->pw_name) == 0)
1727                 continue;
1728
1729         if (pass == NULL) {
1730                 endpwent();
1731                 return NULL;
1732         }
1733         return strdup(pass->pw_name);
1734 }
1735
1736
1737 /*
1738  * el-compatible wrapper to send TSTP on ^Z
1739  */
1740 /* ARGSUSED */
1741 static unsigned char
1742 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1743 {
1744         (void)kill(0, SIGTSTP);
1745         return CC_NORM;
1746 }
1747
1748 /*
1749  * Display list of strings in columnar format on readline's output stream.
1750  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1751  * 'max' is maximum length of string in 'matches'.
1752  */
1753 void
1754 rl_display_match_list(char **matches, int len, int max)
1755 {
1756
1757         fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1758 }
1759
1760 static const char *
1761 /*ARGSUSED*/
1762 _rl_completion_append_character_function(const char *dummy
1763     __attribute__((__unused__)))
1764 {
1765         static char buf[2];
1766         buf[0] = (char)rl_completion_append_character;
1767         buf[1] = '\0';
1768         return buf;
1769 }
1770
1771
1772 /*
1773  * complete word at current point
1774  */
1775 /* ARGSUSED */
1776 int
1777 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1778 {
1779 #ifdef WIDECHAR
1780         static ct_buffer_t wbreak_conv, sprefix_conv;
1781 #endif
1782         char *breakchars;
1783
1784         if (h == NULL || e == NULL)
1785                 rl_initialize();
1786
1787         if (rl_inhibit_completion) {
1788                 char arr[2];
1789                 arr[0] = (char)invoking_key;
1790                 arr[1] = '\0';
1791                 el_insertstr(e, arr);
1792                 return CC_REFRESH;
1793         }
1794
1795         if (rl_completion_word_break_hook != NULL)
1796                 breakchars = (*rl_completion_word_break_hook)();
1797         else
1798                 breakchars = rl_basic_word_break_characters;
1799
1800         /* Just look at how many global variables modify this operation! */
1801         return fn_complete(e,
1802             (CPFunction *)rl_completion_entry_function,
1803             rl_attempted_completion_function,
1804             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1805             ct_decode_string(breakchars, &sprefix_conv),
1806             _rl_completion_append_character_function,
1807             (size_t)rl_completion_query_items,
1808             &rl_completion_type, &rl_attempted_completion_over,
1809             &rl_point, &rl_end, NULL, NULL, NULL);
1810
1811
1812 }
1813
1814
1815 /* ARGSUSED */
1816 static unsigned char
1817 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1818 {
1819         return (unsigned char)rl_complete(0, ch);
1820 }
1821
1822 /*
1823  * misc other functions
1824  */
1825
1826 /*
1827  * bind key c to readline-type function func
1828  */
1829 int
1830 rl_bind_key(int c, rl_command_func_t *func)
1831 {
1832         int retval = -1;
1833
1834         if (h == NULL || e == NULL)
1835                 rl_initialize();
1836
1837         if (func == rl_insert) {
1838                 /* XXX notice there is no range checking of ``c'' */
1839                 e->el_map.key[c] = ED_INSERT;
1840                 retval = 0;
1841         }
1842         return retval;
1843 }
1844
1845
1846 /*
1847  * read one key from input - handles chars pushed back
1848  * to input stream also
1849  */
1850 int
1851 rl_read_key(void)
1852 {
1853         char fooarr[2 * sizeof(int)];
1854
1855         if (e == NULL || h == NULL)
1856                 rl_initialize();
1857
1858         return el_getc(e, fooarr);
1859 }
1860
1861
1862 /*
1863  * reset the terminal
1864  */
1865 /* ARGSUSED */
1866 void
1867 rl_reset_terminal(const char *p __attribute__((__unused__)))
1868 {
1869
1870         if (h == NULL || e == NULL)
1871                 rl_initialize();
1872         el_reset(e);
1873 }
1874
1875
1876 /*
1877  * insert character ``c'' back into input stream, ``count'' times
1878  */
1879 int
1880 rl_insert(int count, int c)
1881 {
1882         char arr[2];
1883
1884         if (h == NULL || e == NULL)
1885                 rl_initialize();
1886
1887         /* XXX - int -> char conversion can lose on multichars */
1888         arr[0] = (char)c;
1889         arr[1] = '\0';
1890
1891         for (; count > 0; count--)
1892                 el_push(e, arr);
1893
1894         return 0;
1895 }
1896
1897 int
1898 rl_insert_text(const char *text)
1899 {
1900         if (!text || *text == 0)
1901                 return 0;
1902
1903         if (h == NULL || e == NULL)
1904                 rl_initialize();
1905
1906         if (el_insertstr(e, text) < 0)
1907                 return 0;
1908         return (int)strlen(text);
1909 }
1910
1911 /*ARGSUSED*/
1912 int
1913 rl_newline(int count __attribute__((__unused__)),
1914     int c __attribute__((__unused__)))
1915 {
1916         /*
1917          * Readline-4.0 appears to ignore the args.
1918          */
1919         return rl_insert(1, '\n');
1920 }
1921
1922 /*ARGSUSED*/
1923 static unsigned char
1924 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
1925 {
1926         if (map[c] == NULL)
1927             return CC_ERROR;
1928
1929         _rl_update_pos();
1930
1931         (*map[c])(NULL, c);
1932
1933         /* If rl_done was set by the above call, deal with it here */
1934         if (rl_done)
1935                 return CC_EOF;
1936
1937         return CC_NORM;
1938 }
1939
1940 int
1941 rl_add_defun(const char *name, Function *fun, int c)
1942 {
1943         char dest[8];
1944         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1945                 return -1;
1946         map[(unsigned char)c] = fun;
1947         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1948         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1949         el_set(e, EL_BIND, dest, name, NULL);
1950         return 0;
1951 }
1952
1953 void
1954 rl_callback_read_char(void)
1955 {
1956         int count = 0, done = 0;
1957         const char *buf = el_gets(e, &count);
1958         char *wbuf;
1959
1960         if (buf == NULL || count-- <= 0)
1961                 return;
1962         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1963                 done = 1;
1964         if (buf[count] == '\n' || buf[count] == '\r')
1965                 done = 2;
1966
1967         if (done && rl_linefunc != NULL) {
1968                 el_set(e, EL_UNBUFFERED, 0);
1969                 if (done == 2) {
1970                     if ((wbuf = strdup(buf)) != NULL)
1971                         wbuf[count] = '\0';
1972                 } else
1973                         wbuf = NULL;
1974                 (*(void (*)(const char *))rl_linefunc)(wbuf);
1975                 el_set(e, EL_UNBUFFERED, 1);
1976         }
1977 }
1978
1979 void
1980 rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
1981 {
1982         if (e == NULL) {
1983                 rl_initialize();
1984         }
1985         (void)rl_set_prompt(prompt);
1986         rl_linefunc = linefunc;
1987         el_set(e, EL_UNBUFFERED, 1);
1988 }
1989
1990 void
1991 rl_callback_handler_remove(void)
1992 {
1993         el_set(e, EL_UNBUFFERED, 0);
1994         rl_linefunc = NULL;
1995 }
1996
1997 void
1998 rl_redisplay(void)
1999 {
2000         char a[2];
2001         a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2002         a[1] = '\0';
2003         el_push(e, a);
2004 }
2005
2006 int
2007 rl_get_previous_history(int count, int key)
2008 {
2009         char a[2];
2010         a[0] = (char)key;
2011         a[1] = '\0';
2012         while (count--)
2013                 el_push(e, a);
2014         return 0;
2015 }
2016
2017 void
2018 /*ARGSUSED*/
2019 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2020 {
2021         el_set(e, EL_PREP_TERM, 1);
2022 }
2023
2024 void
2025 rl_deprep_terminal(void)
2026 {
2027         el_set(e, EL_PREP_TERM, 0);
2028 }
2029
2030 int
2031 rl_read_init_file(const char *s)
2032 {
2033         return el_source(e, s);
2034 }
2035
2036 int
2037 rl_parse_and_bind(const char *line)
2038 {
2039         const char **argv;
2040         int argc;
2041         Tokenizer *tok;
2042
2043         tok = tok_init(NULL);
2044         tok_str(tok, line, &argc, &argv);
2045         argc = el_parse(e, argc, argv);
2046         tok_end(tok);
2047         return argc ? 1 : 0;
2048 }
2049
2050 int
2051 rl_variable_bind(const char *var, const char *value)
2052 {
2053         /*
2054          * The proper return value is undocument, but this is what the
2055          * readline source seems to do.
2056          */
2057         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2058 }
2059
2060 void
2061 rl_stuff_char(int c)
2062 {
2063         char buf[2];
2064
2065         buf[0] = (char)c;
2066         buf[1] = '\0';
2067         el_insertstr(e, buf);
2068 }
2069
2070 static int
2071 _rl_event_read_char(EditLine *el, char *cp)
2072 {
2073         int     n;
2074         ssize_t num_read = 0;
2075
2076         *cp = '\0';
2077         while (rl_event_hook) {
2078
2079                 (*rl_event_hook)();
2080
2081 #if defined(FIONREAD)
2082                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2083                         return -1;
2084                 if (n)
2085                         num_read = read(el->el_infd, cp, (size_t)1);
2086                 else
2087                         num_read = 0;
2088 #elif defined(F_SETFL) && defined(O_NDELAY)
2089                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2090                         return -1;
2091                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2092                         return -1;
2093                 num_read = read(el->el_infd, cp, 1);
2094                 if (fcntl(el->el_infd, F_SETFL, n))
2095                         return -1;
2096 #else
2097                 /* not non-blocking, but what you gonna do? */
2098                 num_read = read(el->el_infd, cp, 1);
2099                 return -1;
2100 #endif
2101
2102                 if (num_read < 0 && errno == EAGAIN)
2103                         continue;
2104                 if (num_read == 0)
2105                         continue;
2106                 break;
2107         }
2108         if (!rl_event_hook)
2109                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2110         return (int)num_read;
2111 }
2112
2113 static void
2114 _rl_update_pos(void)
2115 {
2116         const LineInfo *li = el_line(e);
2117
2118         rl_point = (int)(li->cursor - li->buffer);
2119         rl_end = (int)(li->lastchar - li->buffer);
2120 }
2121
2122 void
2123 rl_get_screen_size(int *rows, int *cols)
2124 {
2125         if (rows)
2126                 el_get(e, EL_GETTC, "li", rows, (void *)0);
2127         if (cols)
2128                 el_get(e, EL_GETTC, "co", cols, (void *)0);
2129 }
2130
2131 void
2132 rl_set_screen_size(int rows, int cols)
2133 {
2134         char buf[64];
2135         (void)snprintf(buf, sizeof(buf), "%d", rows);
2136         el_set(e, EL_SETTC, "li", buf, NULL);
2137         (void)snprintf(buf, sizeof(buf), "%d", cols);
2138         el_set(e, EL_SETTC, "co", buf, NULL);
2139 }
2140
2141 char **
2142 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2143 {
2144         size_t len, max, i, j, min;
2145         char **list, *match, *a, *b;
2146
2147         len = 1;
2148         max = 10;
2149         if ((list = el_malloc(max * sizeof(*list))) == NULL)
2150                 return NULL;
2151
2152         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2153                 list[len++] = match;
2154                 if (len == max) {
2155                         char **nl;
2156                         max += 10;
2157                         if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2158                                 goto out;
2159                         list = nl;
2160                 }
2161         }
2162         if (len == 1)
2163                 goto out;
2164         list[len] = NULL;
2165         if (len == 2) {
2166                 if ((list[0] = strdup(list[1])) == NULL)
2167                         goto out;
2168                 return list;
2169         }
2170         qsort(&list[1], len - 1, sizeof(*list),
2171             (int (*)(const void *, const void *)) strcmp);
2172         min = SIZE_T_MAX;
2173         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2174                 b = list[i + 1];
2175                 for (j = 0; a[j] && a[j] == b[j]; j++)
2176                         continue;
2177                 if (min > j)
2178                         min = j;
2179         }
2180         if (min == 0 && *str) {
2181                 if ((list[0] = strdup(str)) == NULL)
2182                         goto out;
2183         } else {
2184                 if ((list[0] = el_malloc((min + 1) * sizeof(*list[0]))) == NULL)
2185                         goto out;
2186                 (void)memcpy(list[0], list[1], min);
2187                 list[0][min] = '\0';
2188         }
2189         return list;
2190
2191 out:
2192         el_free(list);
2193         return NULL;
2194 }
2195
2196 char *
2197 rl_filename_completion_function (const char *text, int state)
2198 {
2199         return fn_filename_completion_function(text, state);
2200 }
2201
2202 void
2203 rl_forced_update_display(void)
2204 {
2205         el_set(e, EL_REFRESH);
2206 }
2207
2208 int
2209 _rl_abort_internal(void)
2210 {
2211         el_beep(e);
2212         longjmp(topbuf, 1);
2213         /*NOTREACHED*/
2214 }
2215
2216 int
2217 _rl_qsort_string_compare(char **s1, char **s2)
2218 {
2219         return strcoll(*s1, *s2);
2220 }
2221
2222 HISTORY_STATE *
2223 history_get_history_state(void)
2224 {
2225         HISTORY_STATE *hs;
2226
2227         if ((hs = el_malloc(sizeof(*hs))) == NULL)
2228                 return NULL;
2229         hs->length = history_length;
2230         return hs;
2231 }
2232
2233 int
2234 /*ARGSUSED*/
2235 rl_kill_text(int from __attribute__((__unused__)),
2236     int to __attribute__((__unused__)))
2237 {
2238         return 0;
2239 }
2240
2241 Keymap
2242 rl_make_bare_keymap(void)
2243 {
2244         return NULL;
2245 }
2246
2247 Keymap
2248 rl_get_keymap(void)
2249 {
2250         return NULL;
2251 }
2252
2253 void
2254 /*ARGSUSED*/
2255 rl_set_keymap(Keymap k __attribute__((__unused__)))
2256 {
2257 }
2258
2259 int
2260 /*ARGSUSED*/
2261 rl_generic_bind(int type __attribute__((__unused__)),
2262     const char * keyseq __attribute__((__unused__)),
2263     const char * data __attribute__((__unused__)),
2264     Keymap k __attribute__((__unused__)))
2265 {
2266         return 0;
2267 }
2268
2269 int
2270 /*ARGSUSED*/
2271 rl_bind_key_in_map(int key __attribute__((__unused__)),
2272     rl_command_func_t *fun __attribute__((__unused__)),
2273     Keymap k __attribute__((__unused__)))
2274 {
2275         return 0;
2276 }
2277
2278 /* unsupported, but needed by python */
2279 void
2280 rl_cleanup_after_signal(void)
2281 {
2282 }
2283
2284 int
2285 rl_on_new_line(void)
2286 {
2287         return 0;
2288 }
2289
2290 void
2291 rl_free_line_state(void)
2292 {
2293 }