lib/libedit/readline.c

   1 /*      $NetBSD: readline.c,v 1.90 2010/08/04 20:29:18 christos Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jaromir Dolecek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __RCSID("$NetBSD: readline.c,v 1.90 2010/08/04 20:29:18 christos Exp $");
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <stdio.h>
  39 #include <dirent.h>
  40 #include <string.h>
  41 #include <pwd.h>
  42 #include <ctype.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45 #include <limits.h>
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <setjmp.h>
  49 #include <vis.h>
  50 #include "sys.h"
  51 #include "readline/readline.h"
  52 #include "chartype.h"
  53 #include "el.h"
  54 #include "fcns.h"               /* for EL_NUM_FCNS */
  55 #include "histedit.h"
  56 #include "filecomplete.h"
  57
  58 void rl_prep_terminal(int);
  59 void rl_deprep_terminal(void);
  60
  61 /* for rl_complete() */
  62 #define TAB             '\r'
  63
  64 /* see comment at the #ifdef for sense of this */
  65 /* #define GDB_411_HACK */
  66
  67 /* readline compatibility stuff - look at readline sources/documentation */
  68 /* to see what these variables mean */
  69 const char *rl_library_version = "EditLine wrapper";
  70 int rl_readline_version = RL_READLINE_VERSION;
  71 static char empty[] = { '\0' };
  72 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  73 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  74     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  75 char *rl_readline_name = empty;
  76 FILE *rl_instream = NULL;
  77 FILE *rl_outstream = NULL;
  78 int rl_point = 0;
  79 int rl_end = 0;
  80 char *rl_line_buffer = NULL;
  81 VCPFunction *rl_linefunc = NULL;
  82 int rl_done = 0;
  83 VFunction *rl_event_hook = NULL;
  84 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  85     emacs_meta_keymap,
  86     emacs_ctlx_keymap;
  87
  88 int history_base = 1;           /* probably never subject to change */
  89 int history_length = 0;
  90 int max_input_history = 0;
  91 char history_expansion_char = '!';
  92 char history_subst_char = '^';
  93 char *history_no_expand_chars = expand_chars;
  94 Function *history_inhibit_expansion_function = NULL;
  95 char *history_arg_extract(int start, int end, const char *str);
  96
  97 int rl_inhibit_completion = 0;
  98 int rl_attempted_completion_over = 0;
  99 char *rl_basic_word_break_characters = break_chars;
 100 char *rl_completer_word_break_characters = NULL;
 101 char *rl_completer_quote_characters = NULL;
 102 Function *rl_completion_entry_function = NULL;
 103 CPPFunction *rl_attempted_completion_function = NULL;
 104 Function *rl_pre_input_hook = NULL;
 105 Function *rl_startup1_hook = NULL;
 106 int (*rl_getc_function)(FILE *) = NULL;
 107 char *rl_terminal_name = NULL;
 108 int rl_already_prompted = 0;
 109 int rl_filename_completion_desired = 0;
 110 int rl_ignore_completion_duplicates = 0;
 111 int rl_catch_signals = 1;
 112 int readline_echoing_p = 1;
 113 int _rl_print_completions_horizontally = 0;
 114 VFunction *rl_redisplay_function = NULL;
 115 Function *rl_startup_hook = NULL;
 116 VFunction *rl_completion_display_matches_hook = NULL;
 117 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 118 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 119 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 120
 121 #ifdef WIDECHAR
 122 static ct_buffer_t conv;
 123 #endif
 124
 125 /*
 126  * The current prompt string.
 127  */
 128 char *rl_prompt = NULL;
 129 /*
 130  * This is set to character indicating type of completion being done by
 131  * rl_complete_internal(); this is available for application completion
 132  * functions.
 133  */
 134 int rl_completion_type = 0;
 135
 136 /*
 137  * If more than this number of items results from query for possible
 138  * completions, we ask user if they are sure to really display the list.
 139  */
 140 int rl_completion_query_items = 100;
 141
 142 /*
 143  * List of characters which are word break characters, but should be left
 144  * in the parsed text when it is passed to the completion function.
 145  * Shell uses this to help determine what kind of completing to do.
 146  */
 147 char *rl_special_prefixes = NULL;
 148
 149 /*
 150  * This is the character appended to the completed words if at the end of
 151  * the line. Default is ' ' (a space).
 152  */
 153 int rl_completion_append_character = ' ';
 154
 155 /* stuff below is used internally by libedit for readline emulation */
 156
 157 static TYPE(History) *h = NULL;
 158 static EditLine *e = NULL;
 159 static Function *map[256];
 160 static jmp_buf topbuf;
 161
 162 /* internal functions */
 163 static unsigned char     _el_rl_complete(EditLine *, int);
 164 static unsigned char     _el_rl_tstp(EditLine *, int);
 165 static char             *_get_prompt(EditLine *);
 166 static int               _getc_function(EditLine *, char *);
 167 static HIST_ENTRY       *_move_history(int);
 168 static int               _history_expand_command(const char *, size_t, size_t,
 169     char **);
 170 static char             *_rl_compat_sub(const char *, const char *,
 171     const char *, int);
 172 static int               _rl_event_read_char(EditLine *, char *);
 173 static void              _rl_update_pos(void);
 174
 175
 176 /* ARGSUSED */
 177 static char *
 178 _get_prompt(EditLine *el __attribute__((__unused__)))
 179 {
 180         rl_already_prompted = 1;
 181         return (rl_prompt);
 182 }
 183
 184
 185 /*
 186  * generic function for moving around history
 187  */
 188 static HIST_ENTRY *
 189 _move_history(int op)
 190 {
 191         TYPE(HistEvent) ev;
 192         static HIST_ENTRY rl_he;
 193
 194         if (FUNW(history)(h, &ev, op) != 0)
 195                 return (HIST_ENTRY *) NULL;
 196
 197         rl_he.line = ct_encode_string(ev.str, &conv);
 198         rl_he.data = NULL;
 199
 200         return (&rl_he);
 201 }
 202
 203
 204 /*
 205  * read one key from user defined input function
 206  */
 207 static int
 208 /*ARGSUSED*/
 209 _getc_function(EditLine *el, char *c)
 210 {
 211         int i;
 212
 213         i = (*rl_getc_function)(NULL);
 214         if (i == -1)
 215                 return 0;
 216         *c = i;
 217         return 1;
 218 }
 219
 220 static const char _dothistory[] = "/.history";
 221
 222 static const char *
 223 _default_history_file(void)
 224 {
 225         struct passwd *p;
 226         static char path[PATH_MAX];
 227
 228         if (*path)
 229                 return path;
 230         if ((p = getpwuid(getuid())) == NULL)
 231                 return NULL;
 232         strlcpy(path, p->pw_dir, PATH_MAX);
 233         strlcat(path, _dothistory, PATH_MAX);
 234         return path;
 235 }
 236
 237 /*
 238  * READLINE compatibility stuff
 239  */
 240
 241 /*
 242  * Set the prompt
 243  */
 244 int
 245 rl_set_prompt(const char *prompt)
 246 {
 247         char *p;
 248
 249         if (!prompt)
 250                 prompt = "";
 251         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 252                 return 0;
 253         if (rl_prompt)
 254                 free(rl_prompt);
 255         rl_prompt = strdup(prompt);
 256         if (rl_prompt == NULL)
 257                 return -1;
 258
 259         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 260                 *p = RL_PROMPT_START_IGNORE;
 261
 262         return 0;
 263 }
 264
 265 /*
 266  * initialize rl compat stuff
 267  */
 268 int
 269 rl_initialize(void)
 270 {
 271         TYPE(HistEvent) ev;
 272         const LineInfo *li;
 273         int editmode = 1;
 274         struct termios t;
 275
 276         if (e != NULL)
 277                 el_end(e);
 278         if (h != NULL)
 279                 FUN(history,end)(h);
 280
 281         if (!rl_instream)
 282                 rl_instream = stdin;
 283         if (!rl_outstream)
 284                 rl_outstream = stdout;
 285
 286         /*
 287          * See if we don't really want to run the editor
 288          */
 289         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 290                 editmode = 0;
 291
 292         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 293
 294         if (!editmode)
 295                 FUN(el,set)(e, EL_EDITMODE, 0);
 296
 297         h = FUN(history,init)();
 298         if (!e || !h)
 299                 return (-1);
 300
 301         FUNW(history)(h, &ev, H_SETSIZE, INT_MAX);      /* unlimited */
 302         history_length = 0;
 303         max_input_history = INT_MAX;
 304         el_set(e, EL_HIST, history, h);
 305
 306         /* setup getc function if valid */
 307         if (rl_getc_function)
 308                 el_set(e, EL_GETCFN, _getc_function);
 309
 310         /* for proper prompt printing in readline() */
 311         if (rl_set_prompt("") == -1) {
 312                 FUN(history,end)(h);
 313                 el_end(e);
 314                 return -1;
 315         }
 316         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 317         el_set(e, EL_SIGNAL, rl_catch_signals);
 318
 319         /* set default mode to "emacs"-style and read setting afterwards */
 320         /* so this can be overriden */
 321         el_set(e, EL_EDITOR, "emacs");
 322         if (rl_terminal_name != NULL)
 323                 el_set(e, EL_TERMINAL, rl_terminal_name);
 324         else
 325                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 326
 327         /*
 328          * Word completion - this has to go AFTER rebinding keys
 329          * to emacs-style.
 330          */
 331         el_set(e, EL_ADDFN, "rl_complete",
 332             "ReadLine compatible completion function",
 333             _el_rl_complete);
 334         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 335
 336         /*
 337          * Send TSTP when ^Z is pressed.
 338          */
 339         el_set(e, EL_ADDFN, "rl_tstp",
 340             "ReadLine compatible suspend function",
 341             _el_rl_tstp);
 342         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 343
 344         /* read settings from configuration file */
 345         el_source(e, NULL);
 346
 347         /*
 348          * Unfortunately, some applications really do use rl_point
 349          * and rl_line_buffer directly.
 350          */
 351         li = el_line(e);
 352         /* a cheesy way to get rid of const cast. */
 353         rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
 354         _rl_update_pos();
 355
 356         if (rl_startup_hook)
 357                 (*rl_startup_hook)(NULL, 0);
 358
 359         return (0);
 360 }
 361
 362
 363 /*
 364  * read one line from input stream and return it, chomping
 365  * trailing newline (if there is any)
 366  */
 367 char *
 368 readline(const char *p)
 369 {
 370         TYPE(HistEvent) ev;
 371         const char * volatile prompt = p;
 372         int count;
 373         const char *ret;
 374         char *buf;
 375         static int used_event_hook;
 376
 377         if (e == NULL || h == NULL)
 378                 rl_initialize();
 379
 380         rl_done = 0;
 381
 382         (void)setjmp(topbuf);
 383
 384         /* update prompt accordingly to what has been passed */
 385         if (rl_set_prompt(prompt) == -1)
 386                 return NULL;
 387
 388         if (rl_pre_input_hook)
 389                 (*rl_pre_input_hook)(NULL, 0);
 390
 391         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 392                 el_set(e, EL_GETCFN, _rl_event_read_char);
 393                 used_event_hook = 1;
 394         }
 395
 396         if (!rl_event_hook && used_event_hook) {
 397                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 398                 used_event_hook = 0;
 399         }
 400
 401         rl_already_prompted = 0;
 402
 403         /* get one line from input stream */
 404         ret = el_gets(e, &count);
 405
 406         if (ret && count > 0) {
 407                 int lastidx;
 408
 409                 buf = strdup(ret);
 410                 if (buf == NULL)
 411                         return NULL;
 412                 lastidx = count - 1;
 413                 if (buf[lastidx] == '\n')
 414                         buf[lastidx] = '\0';
 415         } else
 416                 buf = NULL;
 417
 418         FUNW(history)(h, &ev, H_GETSIZE);
 419         history_length = ev.num;
 420
 421         return buf;
 422 }
 423
 424 /*
 425  * history functions
 426  */
 427
 428 /*
 429  * is normally called before application starts to use
 430  * history expansion functions
 431  */
 432 void
 433 using_history(void)
 434 {
 435         if (h == NULL || e == NULL)
 436                 rl_initialize();
 437 }
 438
 439
 440 /*
 441  * substitute ``what'' with ``with'', returning resulting string; if
 442  * globally == 1, substitutes all occurrences of what, otherwise only the
 443  * first one
 444  */
 445 static char *
 446 _rl_compat_sub(const char *str, const char *what, const char *with,
 447     int globally)
 448 {
 449         const   char    *s;
 450         char    *r, *result;
 451         size_t  len, with_len, what_len;
 452
 453         len = strlen(str);
 454         with_len = strlen(with);
 455         what_len = strlen(what);
 456
 457         /* calculate length we need for result */
 458         s = str;
 459         while (*s) {
 460                 if (*s == *what && !strncmp(s, what, what_len)) {
 461                         len += with_len - what_len;
 462                         if (!globally)
 463                                 break;
 464                         s += what_len;
 465                 } else
 466                         s++;
 467         }
 468         r = result = malloc(len + 1);
 469         if (result == NULL)
 470                 return NULL;
 471         s = str;
 472         while (*s) {
 473                 if (*s == *what && !strncmp(s, what, what_len)) {
 474                         (void)strncpy(r, with, with_len);
 475                         r += with_len;
 476                         s += what_len;
 477                         if (!globally) {
 478                                 (void)strcpy(r, s);
 479                                 return(result);
 480                         }
 481                 } else
 482                         *r++ = *s++;
 483         }
 484         *r = '\0';
 485         return(result);
 486 }
 487
 488 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 489 static  char    *last_search_match;     /* last !?pat[?] that matched */
 490
 491 const char *
 492 get_history_event(const char *cmd, int *cindex, int qchar)
 493 {
 494         int idx, sign, sub, num, begin, ret;
 495         size_t len;
 496         char    *pat;
 497         const char *rptr;
 498         TYPE(HistEvent) ev;
 499
 500         idx = *cindex;
 501         if (cmd[idx++] != history_expansion_char)
 502                 return(NULL);
 503
 504         /* find out which event to take */
 505         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 506                 if (FUNW(history)(h, &ev, H_FIRST) != 0)
 507                         return(NULL);
 508                 *cindex = cmd[idx]? (idx + 1):idx;
 509                 return ct_encode_string(ev.str, &conv);
 510         }
 511         sign = 0;
 512         if (cmd[idx] == '-') {
 513                 sign = 1;
 514                 idx++;
 515         }
 516
 517         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 518                 HIST_ENTRY *rl_he;
 519
 520                 num = 0;
 521                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 522                         num = num * 10 + cmd[idx] - '0';
 523                         idx++;
 524                 }
 525                 if (sign)
 526                         num = history_length - num + 1;
 527
 528                 if (!(rl_he = history_get(num)))
 529                         return(NULL);
 530
 531                 *cindex = idx;
 532                 return(rl_he->line);
 533         }
 534         sub = 0;
 535         if (cmd[idx] == '?') {
 536                 sub = 1;
 537                 idx++;
 538         }
 539         begin = idx;
 540         while (cmd[idx]) {
 541                 if (cmd[idx] == '\n')
 542                         break;
 543                 if (sub && cmd[idx] == '?')
 544                         break;
 545                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 546                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 547                         break;
 548                 idx++;
 549         }
 550         len = idx - begin;
 551         if (sub && cmd[idx] == '?')
 552                 idx++;
 553         if (sub && len == 0 && last_search_pat && *last_search_pat)
 554                 pat = last_search_pat;
 555         else if (len == 0)
 556                 return(NULL);
 557         else {
 558                 if ((pat = malloc(len + 1)) == NULL)
 559                         return NULL;
 560                 (void)strncpy(pat, cmd + begin, len);
 561                 pat[len] = '\0';
 562         }
 563
 564         if (FUNW(history)(h, &ev, H_CURR) != 0) {
 565                 if (pat != last_search_pat)
 566                         free(pat);
 567                 return (NULL);
 568         }
 569         num = ev.num;
 570
 571         if (sub) {
 572                 if (pat != last_search_pat) {
 573                         if (last_search_pat)
 574                                 free(last_search_pat);
 575                         last_search_pat = pat;
 576                 }
 577                 ret = history_search(pat, -1);
 578         } else
 579                 ret = history_search_prefix(pat, -1);
 580
 581         if (ret == -1) {
 582                 /* restore to end of list on failed search */
 583                 FUNW(history)(h, &ev, H_FIRST);
 584                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 585                 if (pat != last_search_pat)
 586                         free(pat);
 587                 return(NULL);
 588         }
 589
 590         if (sub && len) {
 591                 if (last_search_match && last_search_match != pat)
 592                         free(last_search_match);
 593                 last_search_match = pat;
 594         }
 595
 596         if (pat != last_search_pat)
 597                 free(pat);
 598
 599         if (FUNW(history)(h, &ev, H_CURR) != 0)
 600                 return(NULL);
 601         *cindex = idx;
 602         rptr = ct_encode_string(ev.str, &conv);
 603
 604         /* roll back to original position */
 605         (void)FUNW(history)(h, &ev, H_SET, num);
 606
 607         return rptr;
 608 }
 609
 610 /*
 611  * the real function doing history expansion - takes as argument command
 612  * to do and data upon which the command should be executed
 613  * does expansion the way I've understood readline documentation
 614  *
 615  * returns 0 if data was not modified, 1 if it was and 2 if the string
 616  * should be only printed and not executed; in case of error,
 617  * returns -1 and *result points to NULL
 618  * it's callers responsibility to free() string returned in *result
 619  */
 620 static int
 621 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 622     char **result)
 623 {
 624         char *tmp, *search = NULL, *aptr;
 625         const char *ptr, *cmd;
 626         static char *from = NULL, *to = NULL;
 627         int start, end, idx, has_mods = 0;
 628         int p_on = 0, g_on = 0;
 629
 630         *result = NULL;
 631         aptr = NULL;
 632         ptr = NULL;
 633
 634         /* First get event specifier */
 635         idx = 0;
 636
 637         if (strchr(":^*$", command[offs + 1])) {
 638                 char str[4];
 639                 /*
 640                 * "!:" is shorthand for "!!:".
 641                 * "!^", "!*" and "!$" are shorthand for
 642                 * "!!:^", "!!:*" and "!!:$" respectively.
 643                 */
 644                 str[0] = str[1] = '!';
 645                 str[2] = '0';
 646                 ptr = get_history_event(str, &idx, 0);
 647                 idx = (command[offs + 1] == ':')? 1:0;
 648                 has_mods = 1;
 649         } else {
 650                 if (command[offs + 1] == '#') {
 651                         /* use command so far */
 652                         if ((aptr = malloc(offs + 1)) == NULL)
 653                                 return -1;
 654                         (void)strncpy(aptr, command, offs);
 655                         aptr[offs] = '\0';
 656                         idx = 1;
 657                 } else {
 658                         int     qchar;
 659
 660                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 661                         ptr = get_history_event(command + offs, &idx, qchar);
 662                 }
 663                 has_mods = command[offs + idx] == ':';
 664         }
 665
 666         if (ptr == NULL && aptr == NULL)
 667                 return(-1);
 668
 669         if (!has_mods) {
 670                 *result = strdup(aptr ? aptr : ptr);
 671                 if (aptr)
 672                         free(aptr);
 673                 if (*result == NULL)
 674                         return -1;
 675                 return(1);
 676         }
 677
 678         cmd = command + offs + idx + 1;
 679
 680         /* Now parse any word designators */
 681
 682         if (*cmd == '%')        /* last word matched by ?pat? */
 683                 tmp = strdup(last_search_match? last_search_match:"");
 684         else if (strchr("^*$-0123456789", *cmd)) {
 685                 start = end = -1;
 686                 if (*cmd == '^')
 687                         start = end = 1, cmd++;
 688                 else if (*cmd == '$')
 689                         start = -1, cmd++;
 690                 else if (*cmd == '*')
 691                         start = 1, cmd++;
 692                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 693                         start = 0;
 694                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 695                                 start = start * 10 + *cmd++ - '0';
 696
 697                         if (*cmd == '-') {
 698                                 if (isdigit((unsigned char) cmd[1])) {
 699                                         cmd++;
 700                                         end = 0;
 701                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 702                                                 end = end * 10 + *cmd++ - '0';
 703                                 } else if (cmd[1] == '$') {
 704                                         cmd += 2;
 705                                         end = -1;
 706                                 } else {
 707                                         cmd++;
 708                                         end = -2;
 709                                 }
 710                         } else if (*cmd == '*')
 711                                 end = -1, cmd++;
 712                         else
 713                                 end = start;
 714                 }
 715                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 716                 if (tmp == NULL) {
 717                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 718                             command + offs + idx);
 719                         if (aptr)
 720                                 free(aptr);
 721                         return(-1);
 722                 }
 723         } else
 724                 tmp = strdup(aptr? aptr:ptr);
 725
 726         if (aptr)
 727                 free(aptr);
 728
 729         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 730                 *result = tmp;
 731                 return(1);
 732         }
 733
 734         for (; *cmd; cmd++) {
 735                 if (*cmd == ':')
 736                         continue;
 737                 else if (*cmd == 'h') {         /* remove trailing path */
 738                         if ((aptr = strrchr(tmp, '/')) != NULL)
 739                                 *aptr = '\0';
 740                 } else if (*cmd == 't') {       /* remove leading path */
 741                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 742                                 aptr = strdup(aptr + 1);
 743                                 free(tmp);
 744                                 tmp = aptr;
 745                         }
 746                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 747                         if ((aptr = strrchr(tmp, '.')) != NULL)
 748                                 *aptr = '\0';
 749                 } else if (*cmd == 'e') {       /* remove all but suffix */
 750                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 751                                 aptr = strdup(aptr);
 752                                 free(tmp);
 753                                 tmp = aptr;
 754                         }
 755                 } else if (*cmd == 'p')         /* print only */
 756                         p_on = 1;
 757                 else if (*cmd == 'g')
 758                         g_on = 2;
 759                 else if (*cmd == 's' || *cmd == '&') {
 760                         char *what, *with, delim;
 761                         size_t len, from_len;
 762                         size_t size;
 763
 764                         if (*cmd == '&' && (from == NULL || to == NULL))
 765                                 continue;
 766                         else if (*cmd == 's') {
 767                                 delim = *(++cmd), cmd++;
 768                                 size = 16;
 769                                 what = realloc(from, size);
 770                                 if (what == NULL) {
 771                                         free(from);
 772                                         free(tmp);
 773                                         return 0;
 774                                 }
 775                                 len = 0;
 776                                 for (; *cmd && *cmd != delim; cmd++) {
 777                                         if (*cmd == '\\' && cmd[1] == delim)
 778                                                 cmd++;
 779                                         if (len >= size) {
 780                                                 char *nwhat;
 781                                                 nwhat = realloc(what,
 782                                                                 (size <<= 1));
 783                                                 if (nwhat == NULL) {
 784                                                         free(what);
 785                                                         free(tmp);
 786                                                         return 0;
 787                                                 }
 788                                                 what = nwhat;
 789                                         }
 790                                         what[len++] = *cmd;
 791                                 }
 792                                 what[len] = '\0';
 793                                 from = what;
 794                                 if (*what == '\0') {
 795                                         free(what);
 796                                         if (search) {
 797                                                 from = strdup(search);
 798                                                 if (from == NULL) {
 799                                                         free(tmp);
 800                                                         return 0;
 801                                                 }
 802                                         } else {
 803                                                 from = NULL;
 804                                                 free(tmp);
 805                                                 return (-1);
 806                                         }
 807                                 }
 808                                 cmd++;  /* shift after delim */
 809                                 if (!*cmd)
 810                                         continue;
 811
 812                                 size = 16;
 813                                 with = realloc(to, size);
 814                                 if (with == NULL) {
 815                                         free(to);
 816                                         free(tmp);
 817                                         return -1;
 818                                 }
 819                                 len = 0;
 820                                 from_len = strlen(from);
 821                                 for (; *cmd && *cmd != delim; cmd++) {
 822                                         if (len + from_len + 1 >= size) {
 823                                                 char *nwith;
 824                                                 size += from_len + 1;
 825                                                 nwith = realloc(with, size);
 826                                                 if (nwith == NULL) {
 827                                                         free(with);
 828                                                         free(tmp);
 829                                                         return -1;
 830                                                 }
 831                                                 with = nwith;
 832                                         }
 833                                         if (*cmd == '&') {
 834                                                 /* safe */
 835                                                 (void)strcpy(&with[len], from);
 836                                                 len += from_len;
 837                                                 continue;
 838                                         }
 839                                         if (*cmd == '\\'
 840                                             && (*(cmd + 1) == delim
 841                                                 || *(cmd + 1) == '&'))
 842                                                 cmd++;
 843                                         with[len++] = *cmd;
 844                                 }
 845                                 with[len] = '\0';
 846                                 to = with;
 847                         }
 848
 849                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 850                         if (aptr) {
 851                                 free(tmp);
 852                                 tmp = aptr;
 853                         }
 854                         g_on = 0;
 855                 }
 856         }
 857         *result = tmp;
 858         return (p_on? 2:1);
 859 }
 860
 861
 862 /*
 863  * csh-style history expansion
 864  */
 865 int
 866 history_expand(char *str, char **output)
 867 {
 868         int ret = 0;
 869         size_t idx, i, size;
 870         char *tmp, *result;
 871
 872         if (h == NULL || e == NULL)
 873                 rl_initialize();
 874
 875         if (history_expansion_char == 0) {
 876                 *output = strdup(str);
 877                 return(0);
 878         }
 879
 880         *output = NULL;
 881         if (str[0] == history_subst_char) {
 882                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 883                 *output = malloc(strlen(str) + 4 + 1);
 884                 if (*output == NULL)
 885                         return 0;
 886                 (*output)[0] = (*output)[1] = history_expansion_char;
 887                 (*output)[2] = ':';
 888                 (*output)[3] = 's';
 889                 (void)strcpy((*output) + 4, str);
 890                 str = *output;
 891         } else {
 892                 *output = strdup(str);
 893                 if (*output == NULL)
 894                         return 0;
 895         }
 896
 897 #define ADD_STRING(what, len, fr)                                       \
 898         {                                                               \
 899                 if (idx + len + 1 > size) {                             \
 900                         char *nresult = realloc(result, (size += len + 1));\
 901                         if (nresult == NULL) {                          \
 902                                 free(*output);                          \
 903                                 if (/*CONSTCOND*/fr)                    \
 904                                         free(tmp);                      \
 905                                 return 0;                               \
 906                         }                                               \
 907                         result = nresult;                               \
 908                 }                                                       \
 909                 (void)strncpy(&result[idx], what, len);                 \
 910                 idx += len;                                             \
 911                 result[idx] = '\0';                                     \
 912         }
 913
 914         result = NULL;
 915         size = idx = 0;
 916         tmp = NULL;
 917         for (i = 0; str[i];) {
 918                 int qchar, loop_again;
 919                 size_t len, start, j;
 920
 921                 qchar = 0;
 922                 loop_again = 1;
 923                 start = j = i;
 924 loop:
 925                 for (; str[j]; j++) {
 926                         if (str[j] == '\\' &&
 927                             str[j + 1] == history_expansion_char) {
 928                                 (void)strcpy(&str[j], &str[j + 1]);
 929                                 continue;
 930                         }
 931                         if (!loop_again) {
 932                                 if (isspace((unsigned char) str[j])
 933                                     || str[j] == qchar)
 934                                         break;
 935                         }
 936                         if (str[j] == history_expansion_char
 937                             && !strchr(history_no_expand_chars, str[j + 1])
 938                             && (!history_inhibit_expansion_function ||
 939                             (*history_inhibit_expansion_function)(str,
 940                             (int)j) == 0))
 941                                 break;
 942                 }
 943
 944                 if (str[j] && loop_again) {
 945                         i = j;
 946                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
 947                         j++;
 948                         if (str[j] == history_expansion_char)
 949                                 j++;
 950                         loop_again = 0;
 951                         goto loop;
 952                 }
 953                 len = i - start;
 954                 ADD_STRING(&str[start], len, 0);
 955
 956                 if (str[i] == '\0' || str[i] != history_expansion_char) {
 957                         len = j - i;
 958                         ADD_STRING(&str[i], len, 0);
 959                         if (start == 0)
 960                                 ret = 0;
 961                         else
 962                                 ret = 1;
 963                         break;
 964                 }
 965                 ret = _history_expand_command (str, i, (j - i), &tmp);
 966                 if (ret > 0 && tmp) {
 967                         len = strlen(tmp);
 968                         ADD_STRING(tmp, len, 1);
 969                 }
 970                 if (tmp) {
 971                         free(tmp);
 972                         tmp = NULL;
 973                 }
 974                 i = j;
 975         }
 976
 977         /* ret is 2 for "print only" option */
 978         if (ret == 2) {
 979                 add_history(result);
 980 #ifdef GDB_411_HACK
 981                 /* gdb 4.11 has been shipped with readline, where */
 982                 /* history_expand() returned -1 when the line     */
 983                 /* should not be executed; in readline 2.1+       */
 984                 /* it should return 2 in such a case              */
 985                 ret = -1;
 986 #endif
 987         }
 988         free(*output);
 989         *output = result;
 990
 991         return (ret);
 992 }
 993
 994 /*
 995 * Return a string consisting of arguments of "str" from "start" to "end".
 996 */
 997 char *
 998 history_arg_extract(int start, int end, const char *str)
 999 {
1000         size_t  i, len, max;
1001         char    **arr, *result = NULL;
1002
1003         arr = history_tokenize(str);
1004         if (!arr)
1005                 return NULL;
1006         if (arr && *arr == NULL)
1007                 goto out;
1008
1009         for (max = 0; arr[max]; max++)
1010                 continue;
1011         max--;
1012
1013         if (start == '$')
1014                 start = (int)max;
1015         if (end == '$')
1016                 end = (int)max;
1017         if (end < 0)
1018                 end = (int)max + end + 1;
1019         if (start < 0)
1020                 start = end;
1021
1022         if (start < 0 || end < 0 || (size_t)start > max ||
1023             (size_t)end > max || start > end)
1024                 goto out;
1025
1026         for (i = start, len = 0; i <= (size_t)end; i++)
1027                 len += strlen(arr[i]) + 1;
1028         len++;
1029         result = malloc(len);
1030         if (result == NULL)
1031                 goto out;
1032
1033         for (i = start, len = 0; i <= (size_t)end; i++) {
1034                 (void)strcpy(result + len, arr[i]);
1035                 len += strlen(arr[i]);
1036                 if (i < (size_t)end)
1037                         result[len++] = ' ';
1038         }
1039         result[len] = '\0';
1040
1041 out:
1042         for (i = 0; arr[i]; i++)
1043                 free(arr[i]);
1044         free(arr);
1045
1046         return result;
1047 }
1048
1049 /*
1050  * Parse the string into individual tokens,
1051  * similar to how shell would do it.
1052  */
1053 char **
1054 history_tokenize(const char *str)
1055 {
1056         int size = 1, idx = 0, i, start;
1057         size_t len;
1058         char **result = NULL, *temp, delim = '\0';
1059
1060         for (i = 0; str[i];) {
1061                 while (isspace((unsigned char) str[i]))
1062                         i++;
1063                 start = i;
1064                 for (; str[i];) {
1065                         if (str[i] == '\\') {
1066                                 if (str[i+1] != '\0')
1067                                         i++;
1068                         } else if (str[i] == delim)
1069                                 delim = '\0';
1070                         else if (!delim &&
1071                                     (isspace((unsigned char) str[i]) ||
1072                                 strchr("()<>;&|$", str[i])))
1073                                 break;
1074                         else if (!delim && strchr("'`\"", str[i]))
1075                                 delim = str[i];
1076                         if (str[i])
1077                                 i++;
1078                 }
1079
1080                 if (idx + 2 >= size) {
1081                         char **nresult;
1082                         size <<= 1;
1083                         nresult = realloc(result, size * sizeof(char *));
1084                         if (nresult == NULL) {
1085                                 free(result);
1086                                 return NULL;
1087                         }
1088                         result = nresult;
1089                 }
1090                 len = i - start;
1091                 temp = malloc(len + 1);
1092                 if (temp == NULL) {
1093                         for (i = 0; i < idx; i++)
1094                                 free(result[i]);
1095                         free(result);
1096                         return NULL;
1097                 }
1098                 (void)strncpy(temp, &str[start], len);
1099                 temp[len] = '\0';
1100                 result[idx++] = temp;
1101                 result[idx] = NULL;
1102                 if (str[i])
1103                         i++;
1104         }
1105         return (result);
1106 }
1107
1108
1109 /*
1110  * limit size of history record to ``max'' events
1111  */
1112 void
1113 stifle_history(int max)
1114 {
1115         TYPE(HistEvent) ev;
1116
1117         if (h == NULL || e == NULL)
1118                 rl_initialize();
1119
1120         if (FUNW(history)(h, &ev, H_SETSIZE, max) == 0)
1121                 max_input_history = max;
1122 }
1123
1124
1125 /*
1126  * "unlimit" size of history - set the limit to maximum allowed int value
1127  */
1128 int
1129 unstifle_history(void)
1130 {
1131         TYPE(HistEvent) ev;
1132         int omax;
1133
1134         FUNW(history)(h, &ev, H_SETSIZE, INT_MAX);
1135         omax = max_input_history;
1136         max_input_history = INT_MAX;
1137         return (omax);          /* some value _must_ be returned */
1138 }
1139
1140
1141 int
1142 history_is_stifled(void)
1143 {
1144
1145         /* cannot return true answer */
1146         return (max_input_history != INT_MAX);
1147 }
1148
1149 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1150
1151 int
1152 history_truncate_file (const char *filename, int nlines)
1153 {
1154         int ret = 0;
1155         FILE *fp, *tp;
1156         char template[sizeof(_history_tmp_template)];
1157         char buf[4096];
1158         int fd;
1159         char *cp;
1160         off_t off;
1161         int count = 0;
1162         ssize_t left = 0;
1163
1164         if (filename == NULL && (filename = _default_history_file()) == NULL)
1165                 return errno;
1166         if ((fp = fopen(filename, "r+")) == NULL)
1167                 return errno;
1168         strcpy(template, _history_tmp_template);
1169         if ((fd = mkstemp(template)) == -1) {
1170                 ret = errno;
1171                 goto out1;
1172         }
1173
1174         if ((tp = fdopen(fd, "r+")) == NULL) {
1175                 close(fd);
1176                 ret = errno;
1177                 goto out2;
1178         }
1179
1180         for(;;) {
1181                 if (fread(buf, sizeof(buf), 1, fp) != 1) {
1182                         if (ferror(fp)) {
1183                                 ret = errno;
1184                                 break;
1185                         }
1186                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1187                             (off_t)-1) {
1188                                 ret = errno;
1189                                 break;
1190                         }
1191                         left = fread(buf, 1, sizeof(buf), fp);
1192                         if (ferror(fp)) {
1193                                 ret = errno;
1194                                 break;
1195                         }
1196                         if (left == 0) {
1197                                 count--;
1198                                 left = sizeof(buf);
1199                         } else if (fwrite(buf, (size_t)left, 1, tp) != 1) {
1200                                 ret = errno;
1201                                 break;
1202                         }
1203                         fflush(tp);
1204                         break;
1205                 }
1206                 if (fwrite(buf, sizeof(buf), 1, tp) != 1) {
1207                         ret = errno;
1208                         break;
1209                 }
1210                 count++;
1211         }
1212         if (ret)
1213                 goto out3;
1214         cp = buf + left - 1;
1215         if(*cp != '\n')
1216                 cp++;
1217         for(;;) {
1218                 while (--cp >= buf) {
1219                         if (*cp == '\n') {
1220                                 if (--nlines == 0) {
1221                                         if (++cp >= buf + sizeof(buf)) {
1222                                                 count++;
1223                                                 cp = buf;
1224                                         }
1225                                         break;
1226                                 }
1227                         }
1228                 }
1229                 if (nlines <= 0 || count == 0)
1230                         break;
1231                 count--;
1232                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1233                         ret = errno;
1234                         break;
1235                 }
1236                 if (fread(buf, sizeof(buf), 1, tp) != 1) {
1237                         if (ferror(tp)) {
1238                                 ret = errno;
1239                                 break;
1240                         }
1241                         ret = EAGAIN;
1242                         break;
1243                 }
1244                 cp = buf + sizeof(buf);
1245         }
1246
1247         if (ret || nlines > 0)
1248                 goto out3;
1249
1250         if (fseeko(fp, 0, SEEK_SET) == (off_t)-1) {
1251                 ret = errno;
1252                 goto out3;
1253         }
1254
1255         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1256             (off_t)-1) {
1257                 ret = errno;
1258                 goto out3;
1259         }
1260
1261         for(;;) {
1262                 if ((left = fread(buf, 1, sizeof(buf), tp)) == 0) {
1263                         if (ferror(fp))
1264                                 ret = errno;
1265                         break;
1266                 }
1267                 if (fwrite(buf, (size_t)left, 1, fp) != 1) {
1268                         ret = errno;
1269                         break;
1270                 }
1271         }
1272         fflush(fp);
1273         if((off = ftello(fp)) > 0)
1274                 (void)ftruncate(fileno(fp), off);
1275 out3:
1276         fclose(tp);
1277 out2:
1278         unlink(template);
1279 out1:
1280         fclose(fp);
1281
1282         return ret;
1283 }
1284
1285
1286 /*
1287  * read history from a file given
1288  */
1289 int
1290 read_history(const char *filename)
1291 {
1292         TYPE(HistEvent) ev;
1293
1294         if (h == NULL || e == NULL)
1295                 rl_initialize();
1296         if (filename == NULL && (filename = _default_history_file()) == NULL)
1297                 return errno;
1298         return (FUNW(history)(h, &ev, H_LOAD, filename) == -1 ?
1299             (errno ? errno : EINVAL) : 0);
1300 }
1301
1302
1303 /*
1304  * write history to a file given
1305  */
1306 int
1307 write_history(const char *filename)
1308 {
1309         TYPE(HistEvent) ev;
1310
1311         if (h == NULL || e == NULL)
1312                 rl_initialize();
1313         if (filename == NULL && (filename = _default_history_file()) == NULL)
1314                 return errno;
1315         return (FUNW(history)(h, &ev, H_SAVE, filename) == -1 ?
1316             (errno ? errno : EINVAL) : 0);
1317 }
1318
1319
1320 /*
1321  * returns history ``num''th event
1322  *
1323  * returned pointer points to static variable
1324  */
1325 HIST_ENTRY *
1326 history_get(int num)
1327 {
1328         static HIST_ENTRY she;
1329         TYPE(HistEvent) ev;
1330         int curr_num;
1331
1332         if (h == NULL || e == NULL)
1333                 rl_initialize();
1334
1335         /* save current position */
1336         if (FUNW(history)(h, &ev, H_CURR) != 0)
1337                 return (NULL);
1338         curr_num = ev.num;
1339
1340         /* start from the oldest */
1341         if (FUNW(history)(h, &ev, H_LAST) != 0)
1342                 return (NULL);  /* error */
1343
1344         /* look forwards for event matching specified offset */
1345         if (FUNW(history)(h, &ev, H_NEXT_EVDATA, num, &she.data))
1346                 return (NULL);
1347
1348         she.line = ct_encode_string(ev.str, &conv);
1349
1350         /* restore pointer to where it was */
1351         (void)FUNW(history)(h, &ev, H_SET, curr_num);
1352
1353         return (&she);
1354 }
1355
1356
1357 /*
1358  * add the line to history table
1359  */
1360 int
1361 add_history(const char *line)
1362 {
1363         TYPE(HistEvent) ev;
1364         const Char *wline;
1365
1366         if (h == NULL || e == NULL)
1367                 rl_initialize();
1368
1369         wline = ct_decode_string(line, &conv);
1370
1371         (void)FUNW(history)(h, &ev, H_ENTER, wline);
1372         if (FUNW(history)(h, &ev, H_GETSIZE) == 0)
1373                 history_length = ev.num;
1374
1375         return (!(history_length > 0)); /* return 0 if all is okay */
1376 }
1377
1378
1379 /*
1380  * remove the specified entry from the history list and return it.
1381  */
1382 HIST_ENTRY *
1383 remove_history(int num)
1384 {
1385         HIST_ENTRY *he;
1386         TYPE(HistEvent) ev;
1387
1388         if (h == NULL || e == NULL)
1389                 rl_initialize();
1390
1391         if ((he = malloc(sizeof(*he))) == NULL)
1392                 return NULL;
1393
1394         if (FUNW(history)(h, &ev, H_DELDATA, num, &he->data) != 0) {
1395                 free(he);
1396                 return NULL;
1397         }
1398
1399         he->line = ct_encode_string(ev.str, &conv);
1400         if (FUNW(history)(h, &ev, H_GETSIZE) == 0)
1401                 history_length = ev.num;
1402
1403         return he;
1404 }
1405
1406
1407 /*
1408  * replace the line and data of the num-th entry
1409  */
1410 HIST_ENTRY *
1411 replace_history_entry(int num, const char *line, histdata_t data)
1412 {
1413         HIST_ENTRY *he;
1414         TYPE(HistEvent) ev;
1415         int curr_num;
1416
1417         if (h == NULL || e == NULL)
1418                 rl_initialize();
1419
1420         /* save current position */
1421         if (FUNW(history)(h, &ev, H_CURR) != 0)
1422                 return NULL;
1423         curr_num = ev.num;
1424
1425         /* start from the oldest */
1426         if (FUNW(history)(h, &ev, H_LAST) != 0)
1427                 return NULL;    /* error */
1428
1429         if ((he = malloc(sizeof(*he))) == NULL)
1430                 return NULL;
1431
1432         /* look forwards for event matching specified offset */
1433         if (FUNW(history)(h, &ev, H_NEXT_EVDATA, num, &he->data))
1434                 goto out;
1435
1436         he->line = strdup(ct_encode_string(ev.str, &e->el_scratch));
1437         if (he->line == NULL)
1438                 goto out;
1439
1440         if (FUNW(history)(h, &ev, H_REPLACE, line, data))
1441                 goto out;
1442
1443         /* restore pointer to where it was */
1444         if (FUNW(history)(h, &ev, H_SET, curr_num))
1445                 goto out;
1446
1447         return he;
1448 out:
1449         free(he);
1450         return NULL;
1451 }
1452
1453 /*
1454  * clear the history list - delete all entries
1455  */
1456 void
1457 clear_history(void)
1458 {
1459         TYPE(HistEvent) ev;
1460
1461         (void)FUNW(history)(h, &ev, H_CLEAR);
1462         history_length = 0;
1463 }
1464
1465
1466 /*
1467  * returns offset of the current history event
1468  */
1469 int
1470 where_history(void)
1471 {
1472         TYPE(HistEvent) ev;
1473         int curr_num, off;
1474
1475         if (FUNW(history)(h, &ev, H_CURR) != 0)
1476                 return (0);
1477         curr_num = ev.num;
1478
1479         (void)FUNW(history)(h, &ev, H_FIRST);
1480         off = 1;
1481         while (ev.num != curr_num && FUNW(history)(h, &ev, H_NEXT) == 0)
1482                 off++;
1483
1484         return (off);
1485 }
1486
1487
1488 /*
1489  * returns current history event or NULL if there is no such event
1490  */
1491 HIST_ENTRY *
1492 current_history(void)
1493 {
1494
1495         return (_move_history(H_CURR));
1496 }
1497
1498
1499 /*
1500  * returns total number of bytes history events' data are using
1501  */
1502 int
1503 history_total_bytes(void)
1504 {
1505         TYPE(HistEvent) ev;
1506         int curr_num;
1507         size_t size;
1508
1509         if (FUNW(history)(h, &ev, H_CURR) != 0)
1510                 return (-1);
1511         curr_num = ev.num;
1512
1513         (void)FUNW(history)(h, &ev, H_FIRST);
1514         size = 0;
1515         do
1516                 size += Strlen(ev.str) * sizeof(*ev.str);
1517         while (FUNW(history)(h, &ev, H_NEXT) == 0);
1518
1519         /* get to the same position as before */
1520         FUNW(history)(h, &ev, H_PREV_EVENT, curr_num);
1521
1522         return (int)(size);
1523 }
1524
1525
1526 /*
1527  * sets the position in the history list to ``pos''
1528  */
1529 int
1530 history_set_pos(int pos)
1531 {
1532         TYPE(HistEvent) ev;
1533         int curr_num;
1534
1535         if (pos >= history_length || pos < 0)
1536                 return (-1);
1537
1538         (void)FUNW(history)(h, &ev, H_CURR);
1539         curr_num = ev.num;
1540
1541         /*
1542          * use H_DELDATA to set to nth history (without delete) by passing
1543          * (void **)-1
1544          */
1545         if (FUNW(history)(h, &ev, H_DELDATA, pos, (void **)-1)) {
1546                 (void)FUNW(history)(h, &ev, H_SET, curr_num);
1547                 return(-1);
1548         }
1549         return (0);
1550 }
1551
1552
1553 /*
1554  * returns previous event in history and shifts pointer accordingly
1555  */
1556 HIST_ENTRY *
1557 previous_history(void)
1558 {
1559
1560         return (_move_history(H_PREV));
1561 }
1562
1563
1564 /*
1565  * returns next event in history and shifts pointer accordingly
1566  */
1567 HIST_ENTRY *
1568 next_history(void)
1569 {
1570
1571         return (_move_history(H_NEXT));
1572 }
1573
1574
1575 /*
1576  * searches for first history event containing the str
1577  */
1578 int
1579 history_search(const char *str, int direction)
1580 {
1581         TYPE(HistEvent) ev;
1582         const Char *strp;
1583         const Char *wstr;
1584         int curr_num;
1585
1586         if (FUNW(history)(h, &ev, H_CURR) != 0)
1587                 return (-1);
1588         curr_num = ev.num;
1589
1590         wstr = ct_decode_string(str, &conv);
1591         for (;;) {
1592                 if ((strp = Strstr(ev.str, wstr)) != NULL)
1593                         return (int) (strp - ev.str);
1594                 if (FUNW(history)(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1595                         break;
1596         }
1597         (void)FUNW(history)(h, &ev, H_SET, curr_num);
1598         return (-1);
1599 }
1600
1601
1602 /*
1603  * searches for first history event beginning with str
1604  */
1605 int
1606 history_search_prefix(const char *str, int direction)
1607 {
1608         TYPE(HistEvent) ev;
1609
1610         return (FUNW(history)(h, &ev, direction < 0 ?
1611             H_PREV_STR : H_NEXT_STR, str));
1612 }
1613
1614
1615 /*
1616  * search for event in history containing str, starting at offset
1617  * abs(pos); continue backward, if pos<0, forward otherwise
1618  */
1619 /* ARGSUSED */
1620 int
1621 history_search_pos(const char *str,
1622                    int direction __attribute__((__unused__)), int pos)
1623 {
1624         TYPE(HistEvent) ev;
1625         int curr_num, off;
1626         const Char *wstr;
1627
1628         off = (pos > 0) ? pos : -pos;
1629         pos = (pos > 0) ? 1 : -1;
1630
1631         if (FUNW(history)(h, &ev, H_CURR) != 0)
1632                 return (-1);
1633         curr_num = ev.num;
1634
1635         if (history_set_pos(off) != 0 || FUNW(history)(h, &ev, H_CURR) != 0)
1636                 return (-1);
1637
1638         wstr = ct_decode_string(str, &conv);
1639         for (;;) {
1640                 if (Strstr(ev.str, wstr))
1641                         return (off);
1642                 if (FUNW(history)(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1643                         break;
1644         }
1645
1646         /* set "current" pointer back to previous state */
1647         (void)FUNW(history)(h, &ev,
1648             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1649
1650         return (-1);
1651 }
1652
1653
1654 /********************************/
1655 /* completion functions */
1656
1657 char *
1658 tilde_expand(char *name)
1659 {
1660         return fn_tilde_expand(name);
1661 }
1662
1663 char *
1664 filename_completion_function(const char *name, int state)
1665 {
1666         return fn_filename_completion_function(name, state);
1667 }
1668
1669 /*
1670  * a completion generator for usernames; returns _first_ username
1671  * which starts with supplied text
1672  * text contains a partial username preceded by random character
1673  * (usually '~'); state is ignored
1674  * it's callers responsibility to free returned value
1675  */
1676 char *
1677 username_completion_function(const char *text, int state)
1678 {
1679         struct passwd *pwd, pwres;
1680         char pwbuf[1024];
1681
1682         if (text[0] == '\0')
1683                 return (NULL);
1684
1685         if (*text == '~')
1686                 text++;
1687
1688         if (state == 0)
1689                 setpwent();
1690
1691         while (getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pwd) == 0
1692             && pwd != NULL && text[0] == pwd->pw_name[0]
1693             && strcmp(text, pwd->pw_name) == 0);
1694
1695         if (pwd == NULL) {
1696                 endpwent();
1697                 return NULL;
1698         }
1699         return strdup(pwd->pw_name);
1700 }
1701
1702
1703 /*
1704  * el-compatible wrapper to send TSTP on ^Z
1705  */
1706 /* ARGSUSED */
1707 static unsigned char
1708 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1709 {
1710         (void)kill(0, SIGTSTP);
1711         return CC_NORM;
1712 }
1713
1714 /*
1715  * Display list of strings in columnar format on readline's output stream.
1716  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1717  * 'max' is maximum length of string in 'matches'.
1718  */
1719 void
1720 rl_display_match_list(char **matches, int len, int max)
1721 {
1722
1723         fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1724 }
1725
1726 static const char *
1727 /*ARGSUSED*/
1728 _rl_completion_append_character_function(const char *dummy
1729     __attribute__((__unused__)))
1730 {
1731         static char buf[2];
1732         buf[0] = rl_completion_append_character;
1733         buf[1] = '\0';
1734         return buf;
1735 }
1736
1737
1738 /*
1739  * complete word at current point
1740  */
1741 /* ARGSUSED */
1742 int
1743 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1744 {
1745 #ifdef WIDECHAR
1746         static ct_buffer_t wbreak_conv, sprefix_conv;
1747 #endif
1748
1749         if (h == NULL || e == NULL)
1750                 rl_initialize();
1751
1752         if (rl_inhibit_completion) {
1753                 char arr[2];
1754                 arr[0] = (char)invoking_key;
1755                 arr[1] = '\0';
1756                 el_insertstr(e, arr);
1757                 return (CC_REFRESH);
1758         }
1759
1760         /* Just look at how many global variables modify this operation! */
1761         return fn_complete(e,
1762             (CPFunction *)rl_completion_entry_function,
1763             rl_attempted_completion_function,
1764             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1765             ct_decode_string(rl_special_prefixes, &sprefix_conv),
1766             _rl_completion_append_character_function,
1767             (size_t)rl_completion_query_items,
1768             &rl_completion_type, &rl_attempted_completion_over,
1769             &rl_point, &rl_end, NULL, NULL, NULL);
1770 }
1771
1772
1773 /* ARGSUSED */
1774 static unsigned char
1775 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1776 {
1777         return (unsigned char)rl_complete(0, ch);
1778 }
1779
1780 /*
1781  * misc other functions
1782  */
1783
1784 /*
1785  * bind key c to readline-type function func
1786  */
1787 int
1788 rl_bind_key(int c, rl_command_func_t *func)
1789 {
1790         int retval = -1;
1791
1792         if (h == NULL || e == NULL)
1793                 rl_initialize();
1794
1795         if (func == rl_insert) {
1796                 /* XXX notice there is no range checking of ``c'' */
1797                 e->el_map.key[c] = ED_INSERT;
1798                 retval = 0;
1799         }
1800         return (retval);
1801 }
1802
1803
1804 /*
1805  * read one key from input - handles chars pushed back
1806  * to input stream also
1807  */
1808 int
1809 rl_read_key(void)
1810 {
1811         char fooarr[2 * sizeof(int)];
1812
1813         if (e == NULL || h == NULL)
1814                 rl_initialize();
1815
1816         return (el_getc(e, fooarr));
1817 }
1818
1819
1820 /*
1821  * reset the terminal
1822  */
1823 /* ARGSUSED */
1824 void
1825 rl_reset_terminal(const char *p __attribute__((__unused__)))
1826 {
1827
1828         if (h == NULL || e == NULL)
1829                 rl_initialize();
1830         el_reset(e);
1831 }
1832
1833
1834 /*
1835  * insert character ``c'' back into input stream, ``count'' times
1836  */
1837 int
1838 rl_insert(int count, int c)
1839 {
1840         char arr[2];
1841
1842         if (h == NULL || e == NULL)
1843                 rl_initialize();
1844
1845         /* XXX - int -> char conversion can lose on multichars */
1846         arr[0] = c;
1847         arr[1] = '\0';
1848
1849         for (; count > 0; count--)
1850                 el_push(e, arr);
1851
1852         return (0);
1853 }
1854
1855 int
1856 rl_insert_text(const char *text)
1857 {
1858         if (!text || *text == 0)
1859                 return (0);
1860
1861         if (h == NULL || e == NULL)
1862                 rl_initialize();
1863
1864         if (el_insertstr(e, text) < 0)
1865                 return (0);
1866         return (int)strlen(text);
1867 }
1868
1869 /*ARGSUSED*/
1870 int
1871 rl_newline(int count, int c)
1872 {
1873         /*
1874          * Readline-4.0 appears to ignore the args.
1875          */
1876         return rl_insert(1, '\n');
1877 }
1878
1879 /*ARGSUSED*/
1880 static unsigned char
1881 rl_bind_wrapper(EditLine *el, unsigned char c)
1882 {
1883         if (map[c] == NULL)
1884             return CC_ERROR;
1885
1886         _rl_update_pos();
1887
1888         (*map[c])(NULL, c);
1889
1890         /* If rl_done was set by the above call, deal with it here */
1891         if (rl_done)
1892                 return CC_EOF;
1893
1894         return CC_NORM;
1895 }
1896
1897 int
1898 rl_add_defun(const char *name, Function *fun, int c)
1899 {
1900         char dest[8];
1901         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1902                 return -1;
1903         map[(unsigned char)c] = fun;
1904         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1905         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1906         el_set(e, EL_BIND, dest, name);
1907         return 0;
1908 }
1909
1910 void
1911 rl_callback_read_char()
1912 {
1913         int count = 0, done = 0;
1914         const char *buf = el_gets(e, &count);
1915         char *wbuf;
1916
1917         if (buf == NULL || count-- <= 0)
1918                 return;
1919         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1920                 done = 1;
1921         if (buf[count] == '\n' || buf[count] == '\r')
1922                 done = 2;
1923
1924         if (done && rl_linefunc != NULL) {
1925                 el_set(e, EL_UNBUFFERED, 0);
1926                 if (done == 2) {
1927                     if ((wbuf = strdup(buf)) != NULL)
1928                         wbuf[count] = '\0';
1929                 } else
1930                         wbuf = NULL;
1931                 (*(void (*)(const char *))rl_linefunc)(wbuf);
1932                 //el_set(e, EL_UNBUFFERED, 1);
1933         }
1934 }
1935
1936 void
1937 rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
1938 {
1939         if (e == NULL) {
1940                 rl_initialize();
1941         }
1942         (void)rl_set_prompt(prompt);
1943         rl_linefunc = linefunc;
1944         el_set(e, EL_UNBUFFERED, 1);
1945 }
1946
1947 void
1948 rl_callback_handler_remove(void)
1949 {
1950         el_set(e, EL_UNBUFFERED, 0);
1951         rl_linefunc = NULL;
1952 }
1953
1954 void
1955 rl_redisplay(void)
1956 {
1957         char a[2];
1958         a[0] = e->el_tty.t_c[TS_IO][C_REPRINT];
1959         a[1] = '\0';
1960         el_push(e, a);
1961 }
1962
1963 int
1964 rl_get_previous_history(int count, int key)
1965 {
1966         char a[2];
1967         a[0] = key;
1968         a[1] = '\0';
1969         while (count--)
1970                 el_push(e, a);
1971         return 0;
1972 }
1973
1974 void
1975 /*ARGSUSED*/
1976 rl_prep_terminal(int meta_flag)
1977 {
1978         el_set(e, EL_PREP_TERM, 1);
1979 }
1980
1981 void
1982 rl_deprep_terminal(void)
1983 {
1984         el_set(e, EL_PREP_TERM, 0);
1985 }
1986
1987 int
1988 rl_read_init_file(const char *s)
1989 {
1990         return(el_source(e, s));
1991 }
1992
1993 int
1994 rl_parse_and_bind(const char *line)
1995 {
1996         const char **argv;
1997         int argc;
1998         Tokenizer *tok;
1999
2000         tok = tok_init(NULL);
2001         tok_str(tok, line, &argc, &argv);
2002         argc = el_parse(e, argc, argv);
2003         tok_end(tok);
2004         return (argc ? 1 : 0);
2005 }
2006
2007 int
2008 rl_variable_bind(const char *var, const char *value)
2009 {
2010         /*
2011          * The proper return value is undocument, but this is what the
2012          * readline source seems to do.
2013          */
2014         return ((el_set(e, EL_BIND, "", var, value) == -1) ? 1 : 0);
2015 }
2016
2017 void
2018 rl_stuff_char(int c)
2019 {
2020         char buf[2];
2021
2022         buf[0] = c;
2023         buf[1] = '\0';
2024         el_insertstr(e, buf);
2025 }
2026
2027 static int
2028 _rl_event_read_char(EditLine *el, char *cp)
2029 {
2030         int     n;
2031         ssize_t num_read = 0;
2032
2033         *cp = '\0';
2034         while (rl_event_hook) {
2035
2036                 (*rl_event_hook)();
2037
2038 #if defined(FIONREAD)
2039                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2040                         return(-1);
2041                 if (n)
2042                         num_read = read(el->el_infd, cp, 1);
2043                 else
2044                         num_read = 0;
2045 #elif defined(F_SETFL) && defined(O_NDELAY)
2046                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2047                         return(-1);
2048                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2049                         return(-1);
2050                 num_read = read(el->el_infd, cp, 1);
2051                 if (fcntl(el->el_infd, F_SETFL, n))
2052                         return(-1);
2053 #else
2054                 /* not non-blocking, but what you gonna do? */
2055                 num_read = read(el->el_infd, cp, 1);
2056                 return(-1);
2057 #endif
2058
2059                 if (num_read < 0 && errno == EAGAIN)
2060                         continue;
2061                 if (num_read == 0)
2062                         continue;
2063                 break;
2064         }
2065         if (!rl_event_hook)
2066                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2067         return (int)num_read;
2068 }
2069
2070 static void
2071 _rl_update_pos(void)
2072 {
2073         const LineInfo *li = el_line(e);
2074
2075         rl_point = (int)(li->cursor - li->buffer);
2076         rl_end = (int)(li->lastchar - li->buffer);
2077 }
2078
2079 void
2080 rl_get_screen_size(int *rows, int *cols)
2081 {
2082         if (rows)
2083                 el_get(e, EL_GETTC, "li", rows);
2084         if (cols)
2085                 el_get(e, EL_GETTC, "co", cols);
2086 }
2087
2088 void
2089 rl_set_screen_size(int rows, int cols)
2090 {
2091         char buf[64];
2092         (void)snprintf(buf, sizeof(buf), "%d", rows);
2093         el_set(e, EL_SETTC, "li", buf);
2094         (void)snprintf(buf, sizeof(buf), "%d", cols);
2095         el_set(e, EL_SETTC, "co", buf);
2096 }
2097
2098 char **
2099 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2100 {
2101         size_t len, max, i, j, min;
2102         char **list, *match, *a, *b;
2103
2104         len = 1;
2105         max = 10;
2106         if ((list = malloc(max * sizeof(*list))) == NULL)
2107                 return NULL;
2108
2109         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2110                 list[len++] = match;
2111                 if (len == max) {
2112                         char **nl;
2113                         max += 10;
2114                         if ((nl = realloc(list, max * sizeof(*nl))) == NULL)
2115                                 goto out;
2116                         list = nl;
2117                 }
2118         }
2119         if (len == 1)
2120                 goto out;
2121         list[len] = NULL;
2122         if (len == 2) {
2123                 if ((list[0] = strdup(list[1])) == NULL)
2124                         goto out;
2125                 return list;
2126         }
2127         qsort(&list[1], len - 1, sizeof(*list),
2128             (int (*)(const void *, const void *)) strcmp);
2129         min = SIZE_T_MAX;
2130         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2131                 b = list[i + 1];
2132                 for (j = 0; a[j] && a[j] == b[j]; j++)
2133                         continue;
2134                 if (min > j)
2135                         min = j;
2136         }
2137         if (min == 0 && *str) {
2138                 if ((list[0] = strdup(str)) == NULL)
2139                         goto out;
2140         } else {
2141                 if ((list[0] = malloc(min + 1)) == NULL)
2142                         goto out;
2143                 (void)memcpy(list[0], list[1], min);
2144                 list[0][min] = '\0';
2145         }
2146         return list;
2147
2148 out:
2149         free(list);
2150         return NULL;
2151 }
2152
2153 char *
2154 rl_filename_completion_function (const char *text, int state)
2155 {
2156         return fn_filename_completion_function(text, state);
2157 }
2158
2159 void
2160 rl_forced_update_display(void)
2161 {
2162         el_set(e, EL_REFRESH);
2163 }
2164
2165 int
2166 _rl_abort_internal(void)
2167 {
2168         el_beep(e);
2169         longjmp(topbuf, 1);
2170         /*NOTREACHED*/
2171 }
2172
2173 int
2174 _rl_qsort_string_compare(char **s1, char **s2)
2175 {
2176         return strcoll(*s1, *s2);
2177 }
2178
2179 HISTORY_STATE *
2180 history_get_history_state(void)
2181 {
2182         HISTORY_STATE *hs;
2183
2184         if ((hs = malloc(sizeof(HISTORY_STATE))) == NULL)
2185                 return (NULL);
2186         hs->length = history_length;
2187         return (hs);
2188 }
2189
2190 int
2191 /*ARGSUSED*/
2192 rl_kill_text(int from, int to)
2193 {
2194         return 0;
2195 }
2196
2197 Keymap
2198 rl_make_bare_keymap(void)
2199 {
2200         return NULL;
2201 }
2202
2203 Keymap
2204 rl_get_keymap(void)
2205 {
2206         return NULL;
2207 }
2208
2209 void
2210 /*ARGSUSED*/
2211 rl_set_keymap(Keymap k)
2212 {
2213 }
2214
2215 int
2216 /*ARGSUSED*/
2217 rl_generic_bind(int type, const char * keyseq, const char * data, Keymap k)
2218 {
2219         return 0;
2220 }
2221
2222 int
2223 /*ARGSUSED*/
2224 rl_bind_key_in_map(int key, rl_command_func_t *fun, Keymap k)
2225 {
2226         return 0;
2227 }
2228
2229 /* unsupported, but needed by python */
2230 void
2231 rl_cleanup_after_signal(void)
2232 {
2233 }
2234
2235 int
2236 rl_on_new_line(void)
2237 {
2238         return 0;
2239 }