contrib/libedit/src/readline.c

   1 /*      $NetBSD: readline.c,v 1.106 2012/10/12 23:35:02 christos Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jaromir Dolecek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "config.h"
  33 #if !defined(lint) && !defined(SCCSID)
  34 __RCSID("$NetBSD: readline.c,v 1.106 2012/10/12 23:35:02 christos Exp $");
  35 #endif /* not lint && not SCCSID */
  36
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <stdio.h>
  40 #include <dirent.h>
  41 #include <string.h>
  42 #include <pwd.h>
  43 #include <ctype.h>
  44 #include <stdlib.h>
  45 #include <unistd.h>
  46 #include <limits.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <setjmp.h>
  50 #include <vis.h>
  51
  52 #include "editline/readline.h"
  53 #include "el.h"
  54 #include "fcns.h"               /* for EL_NUM_FCNS */
  55 #include "histedit.h"
  56 #include "filecomplete.h"
  57
  58 #if !defined(SIZE_T_MAX)
  59 # define SIZE_T_MAX (size_t)(-1)
  60 #endif
  61
  62 void rl_prep_terminal(int);
  63 void rl_deprep_terminal(void);
  64
  65 /* for rl_complete() */
  66 #define TAB             '\r'
  67
  68 /* see comment at the #ifdef for sense of this */
  69 /* #define GDB_411_HACK */
  70
  71 /* readline compatibility stuff - look at readline sources/documentation */
  72 /* to see what these variables mean */
  73 const char *rl_library_version = "EditLine wrapper";
  74 int rl_readline_version = RL_READLINE_VERSION;
  75 static char empty[] = { '\0' };
  76 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  77 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  78     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  79 char *rl_readline_name = empty;
  80 FILE *rl_instream = NULL;
  81 FILE *rl_outstream = NULL;
  82 int rl_point = 0;
  83 int rl_end = 0;
  84 char *rl_line_buffer = NULL;
  85 VCPFunction *rl_linefunc = NULL;
  86 int rl_done = 0;
  87 VFunction *rl_event_hook = NULL;
  88 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  89     emacs_meta_keymap,
  90     emacs_ctlx_keymap;
  91
  92 int history_base = 1;           /* probably never subject to change */
  93 int history_length = 0;
  94 int max_input_history = 0;
  95 char history_expansion_char = '!';
  96 char history_subst_char = '^';
  97 char *history_no_expand_chars = expand_chars;
  98 Function *history_inhibit_expansion_function = NULL;
  99 char *history_arg_extract(int start, int end, const char *str);
 100
 101 int rl_inhibit_completion = 0;
 102 int rl_attempted_completion_over = 0;
 103 char *rl_basic_word_break_characters = break_chars;
 104 char *rl_completer_word_break_characters = NULL;
 105 char *rl_completer_quote_characters = NULL;
 106 Function *rl_completion_entry_function = NULL;
 107 char *(*rl_completion_word_break_hook)(void) = NULL;
 108 CPPFunction *rl_attempted_completion_function = NULL;
 109 Function *rl_pre_input_hook = NULL;
 110 Function *rl_startup1_hook = NULL;
 111 int (*rl_getc_function)(FILE *) = NULL;
 112 char *rl_terminal_name = NULL;
 113 int rl_already_prompted = 0;
 114 int rl_filename_completion_desired = 0;
 115 int rl_ignore_completion_duplicates = 0;
 116 int rl_catch_signals = 1;
 117 int readline_echoing_p = 1;
 118 int _rl_print_completions_horizontally = 0;
 119 VFunction *rl_redisplay_function = NULL;
 120 Function *rl_startup_hook = NULL;
 121 VFunction *rl_completion_display_matches_hook = NULL;
 122 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 123 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 124 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 125
 126 /*
 127  * The current prompt string.
 128  */
 129 char *rl_prompt = NULL;
 130 /*
 131  * This is set to character indicating type of completion being done by
 132  * rl_complete_internal(); this is available for application completion
 133  * functions.
 134  */
 135 int rl_completion_type = 0;
 136
 137 /*
 138  * If more than this number of items results from query for possible
 139  * completions, we ask user if they are sure to really display the list.
 140  */
 141 int rl_completion_query_items = 100;
 142
 143 /*
 144  * List of characters which are word break characters, but should be left
 145  * in the parsed text when it is passed to the completion function.
 146  * Shell uses this to help determine what kind of completing to do.
 147  */
 148 char *rl_special_prefixes = NULL;
 149
 150 /*
 151  * This is the character appended to the completed words if at the end of
 152  * the line. Default is ' ' (a space).
 153  */
 154 int rl_completion_append_character = ' ';
 155
 156 /* stuff below is used internally by libedit for readline emulation */
 157
 158 static History *h = NULL;
 159 static EditLine *e = NULL;
 160 static Function *map[256];
 161 static jmp_buf topbuf;
 162
 163 /* internal functions */
 164 static unsigned char     _el_rl_complete(EditLine *, int);
 165 static unsigned char     _el_rl_tstp(EditLine *, int);
 166 static char             *_get_prompt(EditLine *);
 167 static int               _getc_function(EditLine *, char *);
 168 static HIST_ENTRY       *_move_history(int);
 169 static int               _history_expand_command(const char *, size_t, size_t,
 170     char **);
 171 static char             *_rl_compat_sub(const char *, const char *,
 172     const char *, int);
 173 static int               _rl_event_read_char(EditLine *, char *);
 174 static void              _rl_update_pos(void);
 175
 176
 177 /* ARGSUSED */
 178 static char *
 179 _get_prompt(EditLine *el __attribute__((__unused__)))
 180 {
 181         rl_already_prompted = 1;
 182         return rl_prompt;
 183 }
 184
 185
 186 /*
 187  * generic function for moving around history
 188  */
 189 static HIST_ENTRY *
 190 _move_history(int op)
 191 {
 192         HistEvent ev;
 193         static HIST_ENTRY rl_he;
 194
 195         if (history(h, &ev, op) != 0)
 196                 return NULL;
 197
 198         rl_he.line = ev.str;
 199         rl_he.data = NULL;
 200
 201         return &rl_he;
 202 }
 203
 204
 205 /*
 206  * read one key from user defined input function
 207  */
 208 static int
 209 /*ARGSUSED*/
 210 _getc_function(EditLine *el __attribute__((__unused__)), char *c)
 211 {
 212         int i;
 213
 214         i = (*rl_getc_function)(NULL);
 215         if (i == -1)
 216                 return 0;
 217         *c = (char)i;
 218         return 1;
 219 }
 220
 221 static void
 222 _resize_fun(EditLine *el, void *a)
 223 {
 224         const LineInfo *li;
 225         char **ap = a;
 226
 227         li = el_line(el);
 228         /* a cheesy way to get rid of const cast. */
 229         *ap = memchr(li->buffer, *li->buffer, (size_t)1);
 230 }
 231
 232 static const char *
 233 _default_history_file(void)
 234 {
 235         struct passwd *p;
 236         static char path[PATH_MAX];
 237
 238         if (*path)
 239                 return path;
 240         if ((p = getpwuid(getuid())) == NULL)
 241                 return NULL;
 242         (void)snprintf(path, sizeof(path), "%s/.history", p->pw_dir);
 243         return path;
 244 }
 245
 246 /*
 247  * READLINE compatibility stuff
 248  */
 249
 250 /*
 251  * Set the prompt
 252  */
 253 int
 254 rl_set_prompt(const char *prompt)
 255 {
 256         char *p;
 257
 258         if (!prompt)
 259                 prompt = "";
 260         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 261                 return 0;
 262         if (rl_prompt)
 263                 el_free(rl_prompt);
 264         rl_prompt = strdup(prompt);
 265         if (rl_prompt == NULL)
 266                 return -1;
 267
 268         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 269                 *p = RL_PROMPT_START_IGNORE;
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * initialize rl compat stuff
 276  */
 277 int
 278 rl_initialize(void)
 279 {
 280         HistEvent ev;
 281         int editmode = 1;
 282         struct termios t;
 283
 284         if (e != NULL)
 285                 el_end(e);
 286         if (h != NULL)
 287                 history_end(h);
 288
 289         if (!rl_instream)
 290                 rl_instream = stdin;
 291         if (!rl_outstream)
 292                 rl_outstream = stdout;
 293
 294         /*
 295          * See if we don't really want to run the editor
 296          */
 297         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 298                 editmode = 0;
 299
 300         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 301
 302         if (!editmode)
 303                 el_set(e, EL_EDITMODE, 0);
 304
 305         h = history_init();
 306         if (!e || !h)
 307                 return -1;
 308
 309         history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
 310         history_length = 0;
 311         max_input_history = INT_MAX;
 312         el_set(e, EL_HIST, history, h);
 313
 314         /* Setup resize function */
 315         el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
 316
 317         /* setup getc function if valid */
 318         if (rl_getc_function)
 319                 el_set(e, EL_GETCFN, _getc_function);
 320
 321         /* for proper prompt printing in readline() */
 322         if (rl_set_prompt("") == -1) {
 323                 history_end(h);
 324                 el_end(e);
 325                 return -1;
 326         }
 327         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 328         el_set(e, EL_SIGNAL, rl_catch_signals);
 329
 330         /* set default mode to "emacs"-style and read setting afterwards */
 331         /* so this can be overriden */
 332         el_set(e, EL_EDITOR, "emacs");
 333         if (rl_terminal_name != NULL)
 334                 el_set(e, EL_TERMINAL, rl_terminal_name);
 335         else
 336                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 337
 338         /*
 339          * Word completion - this has to go AFTER rebinding keys
 340          * to emacs-style.
 341          */
 342         el_set(e, EL_ADDFN, "rl_complete",
 343             "ReadLine compatible completion function",
 344             _el_rl_complete);
 345         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 346
 347         /*
 348          * Send TSTP when ^Z is pressed.
 349          */
 350         el_set(e, EL_ADDFN, "rl_tstp",
 351             "ReadLine compatible suspend function",
 352             _el_rl_tstp);
 353         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 354
 355         /* read settings from configuration file */
 356         el_source(e, NULL);
 357
 358         /*
 359          * Unfortunately, some applications really do use rl_point
 360          * and rl_line_buffer directly.
 361          */
 362         _resize_fun(e, &rl_line_buffer);
 363         _rl_update_pos();
 364
 365         if (rl_startup_hook)
 366                 (*rl_startup_hook)(NULL, 0);
 367
 368         return 0;
 369 }
 370
 371
 372 /*
 373  * read one line from input stream and return it, chomping
 374  * trailing newline (if there is any)
 375  */
 376 char *
 377 readline(const char *p)
 378 {
 379         HistEvent ev;
 380         const char * volatile prompt = p;
 381         int count;
 382         const char *ret;
 383         char *buf;
 384         static int used_event_hook;
 385
 386         if (e == NULL || h == NULL)
 387                 rl_initialize();
 388
 389         rl_done = 0;
 390
 391         (void)setjmp(topbuf);
 392
 393         /* update prompt accordingly to what has been passed */
 394         if (rl_set_prompt(prompt) == -1)
 395                 return NULL;
 396
 397         if (rl_pre_input_hook)
 398                 (*rl_pre_input_hook)(NULL, 0);
 399
 400         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 401                 el_set(e, EL_GETCFN, _rl_event_read_char);
 402                 used_event_hook = 1;
 403         }
 404
 405         if (!rl_event_hook && used_event_hook) {
 406                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 407                 used_event_hook = 0;
 408         }
 409
 410         rl_already_prompted = 0;
 411
 412         /* get one line from input stream */
 413         ret = el_gets(e, &count);
 414
 415         if (ret && count > 0) {
 416                 int lastidx;
 417
 418                 buf = strdup(ret);
 419                 if (buf == NULL)
 420                         return NULL;
 421                 lastidx = count - 1;
 422                 if (buf[lastidx] == '\n')
 423                         buf[lastidx] = '\0';
 424         } else
 425                 buf = NULL;
 426
 427         history(h, &ev, H_GETSIZE);
 428         history_length = ev.num;
 429
 430         return buf;
 431 }
 432
 433 /*
 434  * history functions
 435  */
 436
 437 /*
 438  * is normally called before application starts to use
 439  * history expansion functions
 440  */
 441 void
 442 using_history(void)
 443 {
 444         if (h == NULL || e == NULL)
 445                 rl_initialize();
 446 }
 447
 448
 449 /*
 450  * substitute ``what'' with ``with'', returning resulting string; if
 451  * globally == 1, substitutes all occurrences of what, otherwise only the
 452  * first one
 453  */
 454 static char *
 455 _rl_compat_sub(const char *str, const char *what, const char *with,
 456     int globally)
 457 {
 458         const   char    *s;
 459         char    *r, *result;
 460         size_t  len, with_len, what_len;
 461
 462         len = strlen(str);
 463         with_len = strlen(with);
 464         what_len = strlen(what);
 465
 466         /* calculate length we need for result */
 467         s = str;
 468         while (*s) {
 469                 if (*s == *what && !strncmp(s, what, what_len)) {
 470                         len += with_len - what_len;
 471                         if (!globally)
 472                                 break;
 473                         s += what_len;
 474                 } else
 475                         s++;
 476         }
 477         r = result = el_malloc((len + 1) * sizeof(*r));
 478         if (result == NULL)
 479                 return NULL;
 480         s = str;
 481         while (*s) {
 482                 if (*s == *what && !strncmp(s, what, what_len)) {
 483                         (void)strncpy(r, with, with_len);
 484                         r += with_len;
 485                         s += what_len;
 486                         if (!globally) {
 487                                 (void)strcpy(r, s);
 488                                 return result;
 489                         }
 490                 } else
 491                         *r++ = *s++;
 492         }
 493         *r = '\0';
 494         return result;
 495 }
 496
 497 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 498 static  char    *last_search_match;     /* last !?pat[?] that matched */
 499
 500 const char *
 501 get_history_event(const char *cmd, int *cindex, int qchar)
 502 {
 503         int idx, sign, sub, num, begin, ret;
 504         size_t len;
 505         char    *pat;
 506         const char *rptr;
 507         HistEvent ev;
 508
 509         idx = *cindex;
 510         if (cmd[idx++] != history_expansion_char)
 511                 return NULL;
 512
 513         /* find out which event to take */
 514         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 515                 if (history(h, &ev, H_FIRST) != 0)
 516                         return NULL;
 517                 *cindex = cmd[idx]? (idx + 1):idx;
 518                 return ev.str;
 519         }
 520         sign = 0;
 521         if (cmd[idx] == '-') {
 522                 sign = 1;
 523                 idx++;
 524         }
 525
 526         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 527                 HIST_ENTRY *rl_he;
 528
 529                 num = 0;
 530                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 531                         num = num * 10 + cmd[idx] - '0';
 532                         idx++;
 533                 }
 534                 if (sign)
 535                         num = history_length - num + 1;
 536
 537                 if (!(rl_he = history_get(num)))
 538                         return NULL;
 539
 540                 *cindex = idx;
 541                 return rl_he->line;
 542         }
 543         sub = 0;
 544         if (cmd[idx] == '?') {
 545                 sub = 1;
 546                 idx++;
 547         }
 548         begin = idx;
 549         while (cmd[idx]) {
 550                 if (cmd[idx] == '\n')
 551                         break;
 552                 if (sub && cmd[idx] == '?')
 553                         break;
 554                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 555                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 556                         break;
 557                 idx++;
 558         }
 559         len = (size_t)idx - (size_t)begin;
 560         if (sub && cmd[idx] == '?')
 561                 idx++;
 562         if (sub && len == 0 && last_search_pat && *last_search_pat)
 563                 pat = last_search_pat;
 564         else if (len == 0)
 565                 return NULL;
 566         else {
 567                 if ((pat = el_malloc((len + 1) * sizeof(*pat))) == NULL)
 568                         return NULL;
 569                 (void)strncpy(pat, cmd + begin, len);
 570                 pat[len] = '\0';
 571         }
 572
 573         if (history(h, &ev, H_CURR) != 0) {
 574                 if (pat != last_search_pat)
 575                         el_free(pat);
 576                 return NULL;
 577         }
 578         num = ev.num;
 579
 580         if (sub) {
 581                 if (pat != last_search_pat) {
 582                         if (last_search_pat)
 583                                 el_free(last_search_pat);
 584                         last_search_pat = pat;
 585                 }
 586                 ret = history_search(pat, -1);
 587         } else
 588                 ret = history_search_prefix(pat, -1);
 589
 590         if (ret == -1) {
 591                 /* restore to end of list on failed search */
 592                 history(h, &ev, H_FIRST);
 593                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 594                 if (pat != last_search_pat)
 595                         el_free(pat);
 596                 return NULL;
 597         }
 598
 599         if (sub && len) {
 600                 if (last_search_match && last_search_match != pat)
 601                         el_free(last_search_match);
 602                 last_search_match = pat;
 603         }
 604
 605         if (pat != last_search_pat)
 606                 el_free(pat);
 607
 608         if (history(h, &ev, H_CURR) != 0)
 609                 return NULL;
 610         *cindex = idx;
 611         rptr = ev.str;
 612
 613         /* roll back to original position */
 614         (void)history(h, &ev, H_SET, num);
 615
 616         return rptr;
 617 }
 618
 619 /*
 620  * the real function doing history expansion - takes as argument command
 621  * to do and data upon which the command should be executed
 622  * does expansion the way I've understood readline documentation
 623  *
 624  * returns 0 if data was not modified, 1 if it was and 2 if the string
 625  * should be only printed and not executed; in case of error,
 626  * returns -1 and *result points to NULL
 627  * it's callers responsibility to free() string returned in *result
 628  */
 629 static int
 630 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 631     char **result)
 632 {
 633         char *tmp, *search = NULL, *aptr;
 634         const char *ptr, *cmd;
 635         static char *from = NULL, *to = NULL;
 636         int start, end, idx, has_mods = 0;
 637         int p_on = 0, g_on = 0;
 638
 639         *result = NULL;
 640         aptr = NULL;
 641         ptr = NULL;
 642
 643         /* First get event specifier */
 644         idx = 0;
 645
 646         if (strchr(":^*$", command[offs + 1])) {
 647                 char str[4];
 648                 /*
 649                 * "!:" is shorthand for "!!:".
 650                 * "!^", "!*" and "!$" are shorthand for
 651                 * "!!:^", "!!:*" and "!!:$" respectively.
 652                 */
 653                 str[0] = str[1] = '!';
 654                 str[2] = '0';
 655                 ptr = get_history_event(str, &idx, 0);
 656                 idx = (command[offs + 1] == ':')? 1:0;
 657                 has_mods = 1;
 658         } else {
 659                 if (command[offs + 1] == '#') {
 660                         /* use command so far */
 661                         if ((aptr = el_malloc((offs + 1) * sizeof(*aptr)))
 662                             == NULL)
 663                                 return -1;
 664                         (void)strncpy(aptr, command, offs);
 665                         aptr[offs] = '\0';
 666                         idx = 1;
 667                 } else {
 668                         int     qchar;
 669
 670                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 671                         ptr = get_history_event(command + offs, &idx, qchar);
 672                 }
 673                 has_mods = command[offs + (size_t)idx] == ':';
 674         }
 675
 676         if (ptr == NULL && aptr == NULL)
 677                 return -1;
 678
 679         if (!has_mods) {
 680                 *result = strdup(aptr ? aptr : ptr);
 681                 if (aptr)
 682                         el_free(aptr);
 683                 if (*result == NULL)
 684                         return -1;
 685                 return 1;
 686         }
 687
 688         cmd = command + offs + idx + 1;
 689
 690         /* Now parse any word designators */
 691
 692         if (*cmd == '%')        /* last word matched by ?pat? */
 693                 tmp = strdup(last_search_match? last_search_match:"");
 694         else if (strchr("^*$-0123456789", *cmd)) {
 695                 start = end = -1;
 696                 if (*cmd == '^')
 697                         start = end = 1, cmd++;
 698                 else if (*cmd == '$')
 699                         start = -1, cmd++;
 700                 else if (*cmd == '*')
 701                         start = 1, cmd++;
 702                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 703                         start = 0;
 704                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 705                                 start = start * 10 + *cmd++ - '0';
 706
 707                         if (*cmd == '-') {
 708                                 if (isdigit((unsigned char) cmd[1])) {
 709                                         cmd++;
 710                                         end = 0;
 711                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 712                                                 end = end * 10 + *cmd++ - '0';
 713                                 } else if (cmd[1] == '$') {
 714                                         cmd += 2;
 715                                         end = -1;
 716                                 } else {
 717                                         cmd++;
 718                                         end = -2;
 719                                 }
 720                         } else if (*cmd == '*')
 721                                 end = -1, cmd++;
 722                         else
 723                                 end = start;
 724                 }
 725                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 726                 if (tmp == NULL) {
 727                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 728                             command + offs + idx);
 729                         if (aptr)
 730                                 el_free(aptr);
 731                         return -1;
 732                 }
 733         } else
 734                 tmp = strdup(aptr? aptr:ptr);
 735
 736         if (aptr)
 737                 el_free(aptr);
 738
 739         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 740                 *result = tmp;
 741                 return 1;
 742         }
 743
 744         for (; *cmd; cmd++) {
 745                 if (*cmd == ':')
 746                         continue;
 747                 else if (*cmd == 'h') {         /* remove trailing path */
 748                         if ((aptr = strrchr(tmp, '/')) != NULL)
 749                                 *aptr = '\0';
 750                 } else if (*cmd == 't') {       /* remove leading path */
 751                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 752                                 aptr = strdup(aptr + 1);
 753                                 el_free(tmp);
 754                                 tmp = aptr;
 755                         }
 756                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 757                         if ((aptr = strrchr(tmp, '.')) != NULL)
 758                                 *aptr = '\0';
 759                 } else if (*cmd == 'e') {       /* remove all but suffix */
 760                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 761                                 aptr = strdup(aptr);
 762                                 el_free(tmp);
 763                                 tmp = aptr;
 764                         }
 765                 } else if (*cmd == 'p')         /* print only */
 766                         p_on = 1;
 767                 else if (*cmd == 'g')
 768                         g_on = 2;
 769                 else if (*cmd == 's' || *cmd == '&') {
 770                         char *what, *with, delim;
 771                         size_t len, from_len;
 772                         size_t size;
 773
 774                         if (*cmd == '&' && (from == NULL || to == NULL))
 775                                 continue;
 776                         else if (*cmd == 's') {
 777                                 delim = *(++cmd), cmd++;
 778                                 size = 16;
 779                                 what = el_realloc(from, size * sizeof(*what));
 780                                 if (what == NULL) {
 781                                         el_free(from);
 782                                         el_free(tmp);
 783                                         return 0;
 784                                 }
 785                                 len = 0;
 786                                 for (; *cmd && *cmd != delim; cmd++) {
 787                                         if (*cmd == '\\' && cmd[1] == delim)
 788                                                 cmd++;
 789                                         if (len >= size) {
 790                                                 char *nwhat;
 791                                                 nwhat = el_realloc(what,
 792                                                     (size <<= 1) *
 793                                                     sizeof(*nwhat));
 794                                                 if (nwhat == NULL) {
 795                                                         el_free(what);
 796                                                         el_free(tmp);
 797                                                         return 0;
 798                                                 }
 799                                                 what = nwhat;
 800                                         }
 801                                         what[len++] = *cmd;
 802                                 }
 803                                 what[len] = '\0';
 804                                 from = what;
 805                                 if (*what == '\0') {
 806                                         el_free(what);
 807                                         if (search) {
 808                                                 from = strdup(search);
 809                                                 if (from == NULL) {
 810                                                         el_free(tmp);
 811                                                         return 0;
 812                                                 }
 813                                         } else {
 814                                                 from = NULL;
 815                                                 el_free(tmp);
 816                                                 return -1;
 817                                         }
 818                                 }
 819                                 cmd++;  /* shift after delim */
 820                                 if (!*cmd)
 821                                         continue;
 822
 823                                 size = 16;
 824                                 with = el_realloc(to, size * sizeof(*with));
 825                                 if (with == NULL) {
 826                                         el_free(to);
 827                                         el_free(tmp);
 828                                         return -1;
 829                                 }
 830                                 len = 0;
 831                                 from_len = strlen(from);
 832                                 for (; *cmd && *cmd != delim; cmd++) {
 833                                         if (len + from_len + 1 >= size) {
 834                                                 char *nwith;
 835                                                 size += from_len + 1;
 836                                                 nwith = el_realloc(with,
 837                                                     size * sizeof(*nwith));
 838                                                 if (nwith == NULL) {
 839                                                         el_free(with);
 840                                                         el_free(tmp);
 841                                                         return -1;
 842                                                 }
 843                                                 with = nwith;
 844                                         }
 845                                         if (*cmd == '&') {
 846                                                 /* safe */
 847                                                 (void)strcpy(&with[len], from);
 848                                                 len += from_len;
 849                                                 continue;
 850                                         }
 851                                         if (*cmd == '\\'
 852                                             && (*(cmd + 1) == delim
 853                                                 || *(cmd + 1) == '&'))
 854                                                 cmd++;
 855                                         with[len++] = *cmd;
 856                                 }
 857                                 with[len] = '\0';
 858                                 to = with;
 859                         }
 860
 861                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 862                         if (aptr) {
 863                                 el_free(tmp);
 864                                 tmp = aptr;
 865                         }
 866                         g_on = 0;
 867                 }
 868         }
 869         *result = tmp;
 870         return p_on? 2:1;
 871 }
 872
 873
 874 /*
 875  * csh-style history expansion
 876  */
 877 int
 878 history_expand(char *str, char **output)
 879 {
 880         int ret = 0;
 881         size_t idx, i, size;
 882         char *tmp, *result;
 883
 884         if (h == NULL || e == NULL)
 885                 rl_initialize();
 886
 887         if (history_expansion_char == 0) {
 888                 *output = strdup(str);
 889                 return 0;
 890         }
 891
 892         *output = NULL;
 893         if (str[0] == history_subst_char) {
 894                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 895                 *output = el_malloc((strlen(str) + 4 + 1) * sizeof(**output));
 896                 if (*output == NULL)
 897                         return 0;
 898                 (*output)[0] = (*output)[1] = history_expansion_char;
 899                 (*output)[2] = ':';
 900                 (*output)[3] = 's';
 901                 (void)strcpy((*output) + 4, str);
 902                 str = *output;
 903         } else {
 904                 *output = strdup(str);
 905                 if (*output == NULL)
 906                         return 0;
 907         }
 908
 909 #define ADD_STRING(what, len, fr)                                       \
 910         {                                                               \
 911                 if (idx + len + 1 > size) {                             \
 912                         char *nresult = el_realloc(result,              \
 913                             (size += len + 1) * sizeof(*nresult));      \
 914                         if (nresult == NULL) {                          \
 915                                 el_free(*output);                       \
 916                                 if (/*CONSTCOND*/fr)                    \
 917                                         el_free(tmp);                   \
 918                                 return 0;                               \
 919                         }                                               \
 920                         result = nresult;                               \
 921                 }                                                       \
 922                 (void)strncpy(&result[idx], what, len);                 \
 923                 idx += len;                                             \
 924                 result[idx] = '\0';                                     \
 925         }
 926
 927         result = NULL;
 928         size = idx = 0;
 929         tmp = NULL;
 930         for (i = 0; str[i];) {
 931                 int qchar, loop_again;
 932                 size_t len, start, j;
 933
 934                 qchar = 0;
 935                 loop_again = 1;
 936                 start = j = i;
 937 loop:
 938                 for (; str[j]; j++) {
 939                         if (str[j] == '\\' &&
 940                             str[j + 1] == history_expansion_char) {
 941                                 (void)strcpy(&str[j], &str[j + 1]);
 942                                 continue;
 943                         }
 944                         if (!loop_again) {
 945                                 if (isspace((unsigned char) str[j])
 946                                     || str[j] == qchar)
 947                                         break;
 948                         }
 949                         if (str[j] == history_expansion_char
 950                             && !strchr(history_no_expand_chars, str[j + 1])
 951                             && (!history_inhibit_expansion_function ||
 952                             (*history_inhibit_expansion_function)(str,
 953                             (int)j) == 0))
 954                                 break;
 955                 }
 956
 957                 if (str[j] && loop_again) {
 958                         i = j;
 959                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
 960                         j++;
 961                         if (str[j] == history_expansion_char)
 962                                 j++;
 963                         loop_again = 0;
 964                         goto loop;
 965                 }
 966                 len = i - start;
 967                 ADD_STRING(&str[start], len, 0);
 968
 969                 if (str[i] == '\0' || str[i] != history_expansion_char) {
 970                         len = j - i;
 971                         ADD_STRING(&str[i], len, 0);
 972                         if (start == 0)
 973                                 ret = 0;
 974                         else
 975                                 ret = 1;
 976                         break;
 977                 }
 978                 ret = _history_expand_command (str, i, (j - i), &tmp);
 979                 if (ret > 0 && tmp) {
 980                         len = strlen(tmp);
 981                         ADD_STRING(tmp, len, 1);
 982                 }
 983                 if (tmp) {
 984                         el_free(tmp);
 985                         tmp = NULL;
 986                 }
 987                 i = j;
 988         }
 989
 990         /* ret is 2 for "print only" option */
 991         if (ret == 2) {
 992                 add_history(result);
 993 #ifdef GDB_411_HACK
 994                 /* gdb 4.11 has been shipped with readline, where */
 995                 /* history_expand() returned -1 when the line     */
 996                 /* should not be executed; in readline 2.1+       */
 997                 /* it should return 2 in such a case              */
 998                 ret = -1;
 999 #endif
1000         }
1001         el_free(*output);
1002         *output = result;
1003
1004         return ret;
1005 }
1006
1007 /*
1008 * Return a string consisting of arguments of "str" from "start" to "end".
1009 */
1010 char *
1011 history_arg_extract(int start, int end, const char *str)
1012 {
1013         size_t  i, len, max;
1014         char    **arr, *result = NULL;
1015
1016         arr = history_tokenize(str);
1017         if (!arr)
1018                 return NULL;
1019         if (arr && *arr == NULL)
1020                 goto out;
1021
1022         for (max = 0; arr[max]; max++)
1023                 continue;
1024         max--;
1025
1026         if (start == '$')
1027                 start = (int)max;
1028         if (end == '$')
1029                 end = (int)max;
1030         if (end < 0)
1031                 end = (int)max + end + 1;
1032         if (start < 0)
1033                 start = end;
1034
1035         if (start < 0 || end < 0 || (size_t)start > max ||
1036             (size_t)end > max || start > end)
1037                 goto out;
1038
1039         for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1040                 len += strlen(arr[i]) + 1;
1041         len++;
1042         result = el_malloc(len * sizeof(*result));
1043         if (result == NULL)
1044                 goto out;
1045
1046         for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1047                 (void)strcpy(result + len, arr[i]);
1048                 len += strlen(arr[i]);
1049                 if (i < (size_t)end)
1050                         result[len++] = ' ';
1051         }
1052         result[len] = '\0';
1053
1054 out:
1055         for (i = 0; arr[i]; i++)
1056                 el_free(arr[i]);
1057         el_free(arr);
1058
1059         return result;
1060 }
1061
1062 /*
1063  * Parse the string into individual tokens,
1064  * similar to how shell would do it.
1065  */
1066 char **
1067 history_tokenize(const char *str)
1068 {
1069         int size = 1, idx = 0, i, start;
1070         size_t len;
1071         char **result = NULL, *temp, delim = '\0';
1072
1073         for (i = 0; str[i];) {
1074                 while (isspace((unsigned char) str[i]))
1075                         i++;
1076                 start = i;
1077                 for (; str[i];) {
1078                         if (str[i] == '\\') {
1079                                 if (str[i+1] != '\0')
1080                                         i++;
1081                         } else if (str[i] == delim)
1082                                 delim = '\0';
1083                         else if (!delim &&
1084                                     (isspace((unsigned char) str[i]) ||
1085                                 strchr("()<>;&|$", str[i])))
1086                                 break;
1087                         else if (!delim && strchr("'`\"", str[i]))
1088                                 delim = str[i];
1089                         if (str[i])
1090                                 i++;
1091                 }
1092
1093                 if (idx + 2 >= size) {
1094                         char **nresult;
1095                         size <<= 1;
1096                         nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1097                         if (nresult == NULL) {
1098                                 el_free(result);
1099                                 return NULL;
1100                         }
1101                         result = nresult;
1102                 }
1103                 len = (size_t)i - (size_t)start;
1104                 temp = el_malloc((size_t)(len + 1) * sizeof(*temp));
1105                 if (temp == NULL) {
1106                         for (i = 0; i < idx; i++)
1107                                 el_free(result[i]);
1108                         el_free(result);
1109                         return NULL;
1110                 }
1111                 (void)strncpy(temp, &str[start], len);
1112                 temp[len] = '\0';
1113                 result[idx++] = temp;
1114                 result[idx] = NULL;
1115                 if (str[i])
1116                         i++;
1117         }
1118         return result;
1119 }
1120
1121
1122 /*
1123  * limit size of history record to ``max'' events
1124  */
1125 void
1126 stifle_history(int max)
1127 {
1128         HistEvent ev;
1129
1130         if (h == NULL || e == NULL)
1131                 rl_initialize();
1132
1133         if (history(h, &ev, H_SETSIZE, max) == 0)
1134                 max_input_history = max;
1135 }
1136
1137
1138 /*
1139  * "unlimit" size of history - set the limit to maximum allowed int value
1140  */
1141 int
1142 unstifle_history(void)
1143 {
1144         HistEvent ev;
1145         int omax;
1146
1147         history(h, &ev, H_SETSIZE, INT_MAX);
1148         omax = max_input_history;
1149         max_input_history = INT_MAX;
1150         return omax;            /* some value _must_ be returned */
1151 }
1152
1153
1154 int
1155 history_is_stifled(void)
1156 {
1157
1158         /* cannot return true answer */
1159         return max_input_history != INT_MAX;
1160 }
1161
1162 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1163
1164 int
1165 history_truncate_file (const char *filename, int nlines)
1166 {
1167         int ret = 0;
1168         FILE *fp, *tp;
1169         char template[sizeof(_history_tmp_template)];
1170         char buf[4096];
1171         int fd;
1172         char *cp;
1173         off_t off;
1174         int count = 0;
1175         ssize_t left = 0;
1176
1177         if (filename == NULL && (filename = _default_history_file()) == NULL)
1178                 return errno;
1179         if ((fp = fopen(filename, "r+")) == NULL)
1180                 return errno;
1181         strcpy(template, _history_tmp_template);
1182         if ((fd = mkstemp(template)) == -1) {
1183                 ret = errno;
1184                 goto out1;
1185         }
1186
1187         if ((tp = fdopen(fd, "r+")) == NULL) {
1188                 close(fd);
1189                 ret = errno;
1190                 goto out2;
1191         }
1192
1193         for(;;) {
1194                 if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1195                         if (ferror(fp)) {
1196                                 ret = errno;
1197                                 break;
1198                         }
1199                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1200                             (off_t)-1) {
1201                                 ret = errno;
1202                                 break;
1203                         }
1204                         left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1205                         if (ferror(fp)) {
1206                                 ret = errno;
1207                                 break;
1208                         }
1209                         if (left == 0) {
1210                                 count--;
1211                                 left = sizeof(buf);
1212                         } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1213                             != 1) {
1214                                 ret = errno;
1215                                 break;
1216                         }
1217                         fflush(tp);
1218                         break;
1219                 }
1220                 if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1221                         ret = errno;
1222                         break;
1223                 }
1224                 count++;
1225         }
1226         if (ret)
1227                 goto out3;
1228         cp = buf + left - 1;
1229         if(*cp != '\n')
1230                 cp++;
1231         for(;;) {
1232                 while (--cp >= buf) {
1233                         if (*cp == '\n') {
1234                                 if (--nlines == 0) {
1235                                         if (++cp >= buf + sizeof(buf)) {
1236                                                 count++;
1237                                                 cp = buf;
1238                                         }
1239                                         break;
1240                                 }
1241                         }
1242                 }
1243                 if (nlines <= 0 || count == 0)
1244                         break;
1245                 count--;
1246                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1247                         ret = errno;
1248                         break;
1249                 }
1250                 if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1251                         if (ferror(tp)) {
1252                                 ret = errno;
1253                                 break;
1254                         }
1255                         ret = EAGAIN;
1256                         break;
1257                 }
1258                 cp = buf + sizeof(buf);
1259         }
1260
1261         if (ret || nlines > 0)
1262                 goto out3;
1263
1264         if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1265                 ret = errno;
1266                 goto out3;
1267         }
1268
1269         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1270             (off_t)-1) {
1271                 ret = errno;
1272                 goto out3;
1273         }
1274
1275         for(;;) {
1276                 if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1277                         if (ferror(fp))
1278                                 ret = errno;
1279                         break;
1280                 }
1281                 if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1282                         ret = errno;
1283                         break;
1284                 }
1285         }
1286         fflush(fp);
1287         if((off = ftello(fp)) > 0)
1288                 (void)ftruncate(fileno(fp), off);
1289 out3:
1290         fclose(tp);
1291 out2:
1292         unlink(template);
1293 out1:
1294         fclose(fp);
1295
1296         return ret;
1297 }
1298
1299
1300 /*
1301  * read history from a file given
1302  */
1303 int
1304 read_history(const char *filename)
1305 {
1306         HistEvent ev;
1307
1308         if (h == NULL || e == NULL)
1309                 rl_initialize();
1310         if (filename == NULL && (filename = _default_history_file()) == NULL)
1311                 return errno;
1312         return history(h, &ev, H_LOAD, filename) == -1 ?
1313             (errno ? errno : EINVAL) : 0;
1314 }
1315
1316
1317 /*
1318  * write history to a file given
1319  */
1320 int
1321 write_history(const char *filename)
1322 {
1323         HistEvent ev;
1324
1325         if (h == NULL || e == NULL)
1326                 rl_initialize();
1327         if (filename == NULL && (filename = _default_history_file()) == NULL)
1328                 return errno;
1329         return history(h, &ev, H_SAVE, filename) == -1 ?
1330             (errno ? errno : EINVAL) : 0;
1331 }
1332
1333
1334 /*
1335  * returns history ``num''th event
1336  *
1337  * returned pointer points to static variable
1338  */
1339 HIST_ENTRY *
1340 history_get(int num)
1341 {
1342         static HIST_ENTRY she;
1343         HistEvent ev;
1344         int curr_num;
1345
1346         if (h == NULL || e == NULL)
1347                 rl_initialize();
1348
1349         /* save current position */
1350         if (history(h, &ev, H_CURR) != 0)
1351                 return NULL;
1352         curr_num = ev.num;
1353
1354         /* start from the oldest */
1355         if (history(h, &ev, H_LAST) != 0)
1356                 return NULL;    /* error */
1357
1358         /* look forwards for event matching specified offset */
1359         if (history(h, &ev, H_NEXT_EVDATA, num, &she.data))
1360                 return NULL;
1361
1362         she.line = ev.str;
1363
1364         /* restore pointer to where it was */
1365         (void)history(h, &ev, H_SET, curr_num);
1366
1367         return &she;
1368 }
1369
1370
1371 /*
1372  * add the line to history table
1373  */
1374 int
1375 add_history(const char *line)
1376 {
1377         HistEvent ev;
1378
1379         if (line == NULL)
1380                 return 0;
1381
1382         if (h == NULL || e == NULL)
1383                 rl_initialize();
1384
1385         (void)history(h, &ev, H_ENTER, line);
1386         if (history(h, &ev, H_GETSIZE) == 0)
1387                 history_length = ev.num;
1388
1389         return !(history_length > 0); /* return 0 if all is okay */
1390 }
1391
1392
1393 /*
1394  * remove the specified entry from the history list and return it.
1395  */
1396 HIST_ENTRY *
1397 remove_history(int num)
1398 {
1399         HIST_ENTRY *he;
1400         HistEvent ev;
1401
1402         if (h == NULL || e == NULL)
1403                 rl_initialize();
1404
1405         if ((he = el_malloc(sizeof(*he))) == NULL)
1406                 return NULL;
1407
1408         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1409                 el_free(he);
1410                 return NULL;
1411         }
1412
1413         he->line = ev.str;
1414         if (history(h, &ev, H_GETSIZE) == 0)
1415                 history_length = ev.num;
1416
1417         return he;
1418 }
1419
1420
1421 /*
1422  * replace the line and data of the num-th entry
1423  */
1424 HIST_ENTRY *
1425 replace_history_entry(int num, const char *line, histdata_t data)
1426 {
1427         HIST_ENTRY *he;
1428         HistEvent ev;
1429         int curr_num;
1430
1431         if (h == NULL || e == NULL)
1432                 rl_initialize();
1433
1434         /* save current position */
1435         if (history(h, &ev, H_CURR) != 0)
1436                 return NULL;
1437         curr_num = ev.num;
1438
1439         /* start from the oldest */
1440         if (history(h, &ev, H_LAST) != 0)
1441                 return NULL;    /* error */
1442
1443         if ((he = el_malloc(sizeof(*he))) == NULL)
1444                 return NULL;
1445
1446         /* look forwards for event matching specified offset */
1447         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1448                 goto out;
1449
1450         he->line = strdup(ev.str);
1451         if (he->line == NULL)
1452                 goto out;
1453
1454         if (history(h, &ev, H_REPLACE, line, data))
1455                 goto out;
1456
1457         /* restore pointer to where it was */
1458         if (history(h, &ev, H_SET, curr_num))
1459                 goto out;
1460
1461         return he;
1462 out:
1463         el_free(he);
1464         return NULL;
1465 }
1466
1467 /*
1468  * clear the history list - delete all entries
1469  */
1470 void
1471 clear_history(void)
1472 {
1473         HistEvent ev;
1474
1475         (void)history(h, &ev, H_CLEAR);
1476         history_length = 0;
1477 }
1478
1479
1480 /*
1481  * returns offset of the current history event
1482  */
1483 int
1484 where_history(void)
1485 {
1486         HistEvent ev;
1487         int curr_num, off;
1488
1489         if (history(h, &ev, H_CURR) != 0)
1490                 return 0;
1491         curr_num = ev.num;
1492
1493         (void)history(h, &ev, H_FIRST);
1494         off = 1;
1495         while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1496                 off++;
1497
1498         return off;
1499 }
1500
1501
1502 /*
1503  * returns current history event or NULL if there is no such event
1504  */
1505 HIST_ENTRY *
1506 current_history(void)
1507 {
1508
1509         return _move_history(H_CURR);
1510 }
1511
1512
1513 /*
1514  * returns total number of bytes history events' data are using
1515  */
1516 int
1517 history_total_bytes(void)
1518 {
1519         HistEvent ev;
1520         int curr_num;
1521         size_t size;
1522
1523         if (history(h, &ev, H_CURR) != 0)
1524                 return -1;
1525         curr_num = ev.num;
1526
1527         (void)history(h, &ev, H_FIRST);
1528         size = 0;
1529         do
1530                 size += strlen(ev.str) * sizeof(*ev.str);
1531         while (history(h, &ev, H_NEXT) == 0);
1532
1533         /* get to the same position as before */
1534         history(h, &ev, H_PREV_EVENT, curr_num);
1535
1536         return (int)size;
1537 }
1538
1539
1540 /*
1541  * sets the position in the history list to ``pos''
1542  */
1543 int
1544 history_set_pos(int pos)
1545 {
1546         HistEvent ev;
1547         int curr_num;
1548
1549         if (pos >= history_length || pos < 0)
1550                 return -1;
1551
1552         (void)history(h, &ev, H_CURR);
1553         curr_num = ev.num;
1554
1555         /*
1556          * use H_DELDATA to set to nth history (without delete) by passing
1557          * (void **)-1
1558          */
1559         if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1560                 (void)history(h, &ev, H_SET, curr_num);
1561                 return -1;
1562         }
1563         return 0;
1564 }
1565
1566
1567 /*
1568  * returns previous event in history and shifts pointer accordingly
1569  */
1570 HIST_ENTRY *
1571 previous_history(void)
1572 {
1573
1574         return _move_history(H_PREV);
1575 }
1576
1577
1578 /*
1579  * returns next event in history and shifts pointer accordingly
1580  */
1581 HIST_ENTRY *
1582 next_history(void)
1583 {
1584
1585         return _move_history(H_NEXT);
1586 }
1587
1588
1589 /*
1590  * searches for first history event containing the str
1591  */
1592 int
1593 history_search(const char *str, int direction)
1594 {
1595         HistEvent ev;
1596         const char *strp;
1597         int curr_num;
1598
1599         if (history(h, &ev, H_CURR) != 0)
1600                 return -1;
1601         curr_num = ev.num;
1602
1603         for (;;) {
1604                 if ((strp = strstr(ev.str, str)) != NULL)
1605                         return (int)(strp - ev.str);
1606                 if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1607                         break;
1608         }
1609         (void)history(h, &ev, H_SET, curr_num);
1610         return -1;
1611 }
1612
1613
1614 /*
1615  * searches for first history event beginning with str
1616  */
1617 int
1618 history_search_prefix(const char *str, int direction)
1619 {
1620         HistEvent ev;
1621
1622         return (history(h, &ev, direction < 0 ?
1623             H_PREV_STR : H_NEXT_STR, str));
1624 }
1625
1626
1627 /*
1628  * search for event in history containing str, starting at offset
1629  * abs(pos); continue backward, if pos<0, forward otherwise
1630  */
1631 /* ARGSUSED */
1632 int
1633 history_search_pos(const char *str,
1634                    int direction __attribute__((__unused__)), int pos)
1635 {
1636         HistEvent ev;
1637         int curr_num, off;
1638
1639         off = (pos > 0) ? pos : -pos;
1640         pos = (pos > 0) ? 1 : -1;
1641
1642         if (history(h, &ev, H_CURR) != 0)
1643                 return -1;
1644         curr_num = ev.num;
1645
1646         if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1647                 return -1;
1648
1649         for (;;) {
1650                 if (strstr(ev.str, str))
1651                         return off;
1652                 if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1653                         break;
1654         }
1655
1656         /* set "current" pointer back to previous state */
1657         (void)history(h, &ev,
1658             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1659
1660         return -1;
1661 }
1662
1663
1664 /********************************/
1665 /* completion functions */
1666
1667 char *
1668 tilde_expand(char *name)
1669 {
1670         return fn_tilde_expand(name);
1671 }
1672
1673 char *
1674 filename_completion_function(const char *name, int state)
1675 {
1676         return fn_filename_completion_function(name, state);
1677 }
1678
1679 /*
1680  * a completion generator for usernames; returns _first_ username
1681  * which starts with supplied text
1682  * text contains a partial username preceded by random character
1683  * (usually '~'); state resets search from start (??? should we do that anyway)
1684  * it's callers responsibility to free returned value
1685  */
1686 char *
1687 username_completion_function(const char *text, int state)
1688 {
1689         struct passwd *pass = NULL;
1690
1691         if (text[0] == '\0')
1692                 return NULL;
1693
1694         if (*text == '~')
1695                 text++;
1696
1697         if (state == 0)
1698                 setpwent();
1699
1700         while (
1701             (pass = getpwent()) != NULL
1702             && text[0] == pass->pw_name[0]
1703             && strcmp(text, pass->pw_name) == 0)
1704                 continue;
1705
1706         if (pass == NULL) {
1707                 endpwent();
1708                 return NULL;
1709         }
1710         return strdup(pass->pw_name);
1711 }
1712
1713
1714 /*
1715  * el-compatible wrapper to send TSTP on ^Z
1716  */
1717 /* ARGSUSED */
1718 static unsigned char
1719 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1720 {
1721         (void)kill(0, SIGTSTP);
1722         return CC_NORM;
1723 }
1724
1725 /*
1726  * Display list of strings in columnar format on readline's output stream.
1727  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1728  * 'max' is maximum length of string in 'matches'.
1729  */
1730 void
1731 rl_display_match_list(char **matches, int len, int max)
1732 {
1733
1734         fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1735 }
1736
1737 static const char *
1738 /*ARGSUSED*/
1739 _rl_completion_append_character_function(const char *dummy
1740     __attribute__((__unused__)))
1741 {
1742         static char buf[2];
1743         buf[0] = (char)rl_completion_append_character;
1744         buf[1] = '\0';
1745         return buf;
1746 }
1747
1748
1749 /*
1750  * complete word at current point
1751  */
1752 /* ARGSUSED */
1753 int
1754 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1755 {
1756 #ifdef WIDECHAR
1757         static ct_buffer_t wbreak_conv, sprefix_conv;
1758 #endif
1759         char *breakchars;
1760
1761         if (h == NULL || e == NULL)
1762                 rl_initialize();
1763
1764         if (rl_inhibit_completion) {
1765                 char arr[2];
1766                 arr[0] = (char)invoking_key;
1767                 arr[1] = '\0';
1768                 el_insertstr(e, arr);
1769                 return CC_REFRESH;
1770         }
1771
1772         if (rl_completion_word_break_hook != NULL)
1773                 breakchars = (*rl_completion_word_break_hook)();
1774         else
1775                 breakchars = rl_basic_word_break_characters;
1776
1777         /* Just look at how many global variables modify this operation! */
1778         return fn_complete(e,
1779             (CPFunction *)rl_completion_entry_function,
1780             rl_attempted_completion_function,
1781             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1782             ct_decode_string(breakchars, &sprefix_conv),
1783             _rl_completion_append_character_function,
1784             (size_t)rl_completion_query_items,
1785             &rl_completion_type, &rl_attempted_completion_over,
1786             &rl_point, &rl_end);
1787
1788
1789 }
1790
1791
1792 /* ARGSUSED */
1793 static unsigned char
1794 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1795 {
1796         return (unsigned char)rl_complete(0, ch);
1797 }
1798
1799 /*
1800  * misc other functions
1801  */
1802
1803 /*
1804  * bind key c to readline-type function func
1805  */
1806 int
1807 rl_bind_key(int c, rl_command_func_t *func)
1808 {
1809         int retval = -1;
1810
1811         if (h == NULL || e == NULL)
1812                 rl_initialize();
1813
1814         if (func == rl_insert) {
1815                 /* XXX notice there is no range checking of ``c'' */
1816                 e->el_map.key[c] = ED_INSERT;
1817                 retval = 0;
1818         }
1819         return retval;
1820 }
1821
1822
1823 /*
1824  * read one key from input - handles chars pushed back
1825  * to input stream also
1826  */
1827 int
1828 rl_read_key(void)
1829 {
1830         char fooarr[2 * sizeof(int)];
1831
1832         if (e == NULL || h == NULL)
1833                 rl_initialize();
1834
1835         return el_getc(e, fooarr);
1836 }
1837
1838
1839 /*
1840  * reset the terminal
1841  */
1842 /* ARGSUSED */
1843 void
1844 rl_reset_terminal(const char *p __attribute__((__unused__)))
1845 {
1846
1847         if (h == NULL || e == NULL)
1848                 rl_initialize();
1849         el_reset(e);
1850 }
1851
1852
1853 /*
1854  * insert character ``c'' back into input stream, ``count'' times
1855  */
1856 int
1857 rl_insert(int count, int c)
1858 {
1859         char arr[2];
1860
1861         if (h == NULL || e == NULL)
1862                 rl_initialize();
1863
1864         /* XXX - int -> char conversion can lose on multichars */
1865         arr[0] = (char)c;
1866         arr[1] = '\0';
1867
1868         for (; count > 0; count--)
1869                 el_push(e, arr);
1870
1871         return 0;
1872 }
1873
1874 int
1875 rl_insert_text(const char *text)
1876 {
1877         if (!text || *text == 0)
1878                 return 0;
1879
1880         if (h == NULL || e == NULL)
1881                 rl_initialize();
1882
1883         if (el_insertstr(e, text) < 0)
1884                 return 0;
1885         return (int)strlen(text);
1886 }
1887
1888 /*ARGSUSED*/
1889 int
1890 rl_newline(int count __attribute__((__unused__)),
1891     int c __attribute__((__unused__)))
1892 {
1893         /*
1894          * Readline-4.0 appears to ignore the args.
1895          */
1896         return rl_insert(1, '\n');
1897 }
1898
1899 /*ARGSUSED*/
1900 static unsigned char
1901 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
1902 {
1903         if (map[c] == NULL)
1904             return CC_ERROR;
1905
1906         _rl_update_pos();
1907
1908         (*map[c])(NULL, c);
1909
1910         /* If rl_done was set by the above call, deal with it here */
1911         if (rl_done)
1912                 return CC_EOF;
1913
1914         return CC_NORM;
1915 }
1916
1917 int
1918 rl_add_defun(const char *name, Function *fun, int c)
1919 {
1920         char dest[8];
1921         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1922                 return -1;
1923         map[(unsigned char)c] = fun;
1924         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1925         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1926         el_set(e, EL_BIND, dest, name, NULL);
1927         return 0;
1928 }
1929
1930 void
1931 rl_callback_read_char(void)
1932 {
1933         int count = 0, done = 0;
1934         const char *buf = el_gets(e, &count);
1935         char *wbuf;
1936
1937         if (buf == NULL || count-- <= 0)
1938                 return;
1939         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1940                 done = 1;
1941         if (buf[count] == '\n' || buf[count] == '\r')
1942                 done = 2;
1943
1944         if (done && rl_linefunc != NULL) {
1945                 el_set(e, EL_UNBUFFERED, 0);
1946                 if (done == 2) {
1947                     if ((wbuf = strdup(buf)) != NULL)
1948                         wbuf[count] = '\0';
1949                 } else
1950                         wbuf = NULL;
1951                 (*(void (*)(const char *))rl_linefunc)(wbuf);
1952                 //el_set(e, EL_UNBUFFERED, 1);
1953         }
1954 }
1955
1956 void
1957 rl_callback_handler_install(const char *prompt, VCPFunction *linefunc)
1958 {
1959         if (e == NULL) {
1960                 rl_initialize();
1961         }
1962         (void)rl_set_prompt(prompt);
1963         rl_linefunc = linefunc;
1964         el_set(e, EL_UNBUFFERED, 1);
1965 }
1966
1967 void
1968 rl_callback_handler_remove(void)
1969 {
1970         el_set(e, EL_UNBUFFERED, 0);
1971         rl_linefunc = NULL;
1972 }
1973
1974 void
1975 rl_redisplay(void)
1976 {
1977         char a[2];
1978         a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
1979         a[1] = '\0';
1980         el_push(e, a);
1981 }
1982
1983 int
1984 rl_get_previous_history(int count, int key)
1985 {
1986         char a[2];
1987         a[0] = (char)key;
1988         a[1] = '\0';
1989         while (count--)
1990                 el_push(e, a);
1991         return 0;
1992 }
1993
1994 void
1995 /*ARGSUSED*/
1996 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
1997 {
1998         el_set(e, EL_PREP_TERM, 1);
1999 }
2000
2001 void
2002 rl_deprep_terminal(void)
2003 {
2004         el_set(e, EL_PREP_TERM, 0);
2005 }
2006
2007 int
2008 rl_read_init_file(const char *s)
2009 {
2010         return el_source(e, s);
2011 }
2012
2013 int
2014 rl_parse_and_bind(const char *line)
2015 {
2016         const char **argv;
2017         int argc;
2018         Tokenizer *tok;
2019
2020         tok = tok_init(NULL);
2021         tok_str(tok, line, &argc, &argv);
2022         argc = el_parse(e, argc, argv);
2023         tok_end(tok);
2024         return argc ? 1 : 0;
2025 }
2026
2027 int
2028 rl_variable_bind(const char *var, const char *value)
2029 {
2030         /*
2031          * The proper return value is undocument, but this is what the
2032          * readline source seems to do.
2033          */
2034         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2035 }
2036
2037 void
2038 rl_stuff_char(int c)
2039 {
2040         char buf[2];
2041
2042         buf[0] = (char)c;
2043         buf[1] = '\0';
2044         el_insertstr(e, buf);
2045 }
2046
2047 static int
2048 _rl_event_read_char(EditLine *el, char *cp)
2049 {
2050         int     n;
2051         ssize_t num_read = 0;
2052
2053         *cp = '\0';
2054         while (rl_event_hook) {
2055
2056                 (*rl_event_hook)();
2057
2058 #if defined(FIONREAD)
2059                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2060                         return -1;
2061                 if (n)
2062                         num_read = read(el->el_infd, cp, (size_t)1);
2063                 else
2064                         num_read = 0;
2065 #elif defined(F_SETFL) && defined(O_NDELAY)
2066                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2067                         return -1;
2068                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2069                         return -1;
2070                 num_read = read(el->el_infd, cp, 1);
2071                 if (fcntl(el->el_infd, F_SETFL, n))
2072                         return -1;
2073 #else
2074                 /* not non-blocking, but what you gonna do? */
2075                 num_read = read(el->el_infd, cp, 1);
2076                 return -1;
2077 #endif
2078
2079                 if (num_read < 0 && errno == EAGAIN)
2080                         continue;
2081                 if (num_read == 0)
2082                         continue;
2083                 break;
2084         }
2085         if (!rl_event_hook)
2086                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2087         return (int)num_read;
2088 }
2089
2090 static void
2091 _rl_update_pos(void)
2092 {
2093         const LineInfo *li = el_line(e);
2094
2095         rl_point = (int)(li->cursor - li->buffer);
2096         rl_end = (int)(li->lastchar - li->buffer);
2097 }
2098
2099 void
2100 rl_get_screen_size(int *rows, int *cols)
2101 {
2102         if (rows)
2103                 el_get(e, EL_GETTC, "li", rows, NULL);
2104         if (cols)
2105                 el_get(e, EL_GETTC, "co", cols, NULL);
2106 }
2107
2108 void
2109 rl_set_screen_size(int rows, int cols)
2110 {
2111         char buf[64];
2112         (void)snprintf(buf, sizeof(buf), "%d", rows);
2113         el_set(e, EL_SETTC, "li", buf, NULL);
2114         (void)snprintf(buf, sizeof(buf), "%d", cols);
2115         el_set(e, EL_SETTC, "co", buf, NULL);
2116 }
2117
2118 char **
2119 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2120 {
2121         size_t len, max, i, j, min;
2122         char **list, *match, *a, *b;
2123
2124         len = 1;
2125         max = 10;
2126         if ((list = el_malloc(max * sizeof(*list))) == NULL)
2127                 return NULL;
2128
2129         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2130                 list[len++] = match;
2131                 if (len == max) {
2132                         char **nl;
2133                         max += 10;
2134                         if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2135                                 goto out;
2136                         list = nl;
2137                 }
2138         }
2139         if (len == 1)
2140                 goto out;
2141         list[len] = NULL;
2142         if (len == 2) {
2143                 if ((list[0] = strdup(list[1])) == NULL)
2144                         goto out;
2145                 return list;
2146         }
2147         qsort(&list[1], len - 1, sizeof(*list),
2148             (int (*)(const void *, const void *)) strcmp);
2149         min = SIZE_T_MAX;
2150         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2151                 b = list[i + 1];
2152                 for (j = 0; a[j] && a[j] == b[j]; j++)
2153                         continue;
2154                 if (min > j)
2155                         min = j;
2156         }
2157         if (min == 0 && *str) {
2158                 if ((list[0] = strdup(str)) == NULL)
2159                         goto out;
2160         } else {
2161                 if ((list[0] = el_malloc((min + 1) * sizeof(*list[0]))) == NULL)
2162                         goto out;
2163                 (void)memcpy(list[0], list[1], min);
2164                 list[0][min] = '\0';
2165         }
2166         return list;
2167
2168 out:
2169         el_free(list);
2170         return NULL;
2171 }
2172
2173 char *
2174 rl_filename_completion_function (const char *text, int state)
2175 {
2176         return fn_filename_completion_function(text, state);
2177 }
2178
2179 void
2180 rl_forced_update_display(void)
2181 {
2182         el_set(e, EL_REFRESH);
2183 }
2184
2185 int
2186 _rl_abort_internal(void)
2187 {
2188         el_beep(e);
2189         longjmp(topbuf, 1);
2190         /*NOTREACHED*/
2191 }
2192
2193 int
2194 _rl_qsort_string_compare(char **s1, char **s2)
2195 {
2196         return strcoll(*s1, *s2);
2197 }
2198
2199 HISTORY_STATE *
2200 history_get_history_state(void)
2201 {
2202         HISTORY_STATE *hs;
2203
2204         if ((hs = el_malloc(sizeof(*hs))) == NULL)
2205                 return NULL;
2206         hs->length = history_length;
2207         return hs;
2208 }
2209
2210 int
2211 /*ARGSUSED*/
2212 rl_kill_text(int from __attribute__((__unused__)),
2213     int to __attribute__((__unused__)))
2214 {
2215         return 0;
2216 }
2217
2218 Keymap
2219 rl_make_bare_keymap(void)
2220 {
2221         return NULL;
2222 }
2223
2224 Keymap
2225 rl_get_keymap(void)
2226 {
2227         return NULL;
2228 }
2229
2230 void
2231 /*ARGSUSED*/
2232 rl_set_keymap(Keymap k __attribute__((__unused__)))
2233 {
2234 }
2235
2236 int
2237 /*ARGSUSED*/
2238 rl_generic_bind(int type __attribute__((__unused__)),
2239     const char * keyseq __attribute__((__unused__)),
2240     const char * data __attribute__((__unused__)),
2241     Keymap k __attribute__((__unused__)))
2242 {
2243         return 0;
2244 }
2245
2246 int
2247 /*ARGSUSED*/
2248 rl_bind_key_in_map(int key __attribute__((__unused__)),
2249     rl_command_func_t *fun __attribute__((__unused__)),
2250     Keymap k __attribute__((__unused__)))
2251 {
2252         return 0;
2253 }
2254
2255 /* unsupported, but needed by python */
2256 void
2257 rl_cleanup_after_signal(void)
2258 {
2259 }
2260
2261 int
2262 rl_on_new_line(void)
2263 {
2264         return 0;
2265 }
2266
2267 void
2268 rl_free_line_state(void)
2269 {
2270 }