lib/libedit/readline.c

   1 /*      $NetBSD: readline.c,v 1.87 2009/12/30 23:54:52 christos Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jaromir Dolecek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include "config.h"
  33 #if !defined(lint) && !defined(SCCSID)
  34 __RCSID("$NetBSD: readline.c,v 1.87 2009/12/30 23:54:52 christos Exp $");
  35 #endif /* not lint && not SCCSID */
  36
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <stdio.h>
  40 #include <dirent.h>
  41 #include <string.h>
  42 #include <pwd.h>
  43 #include <ctype.h>
  44 #include <stdlib.h>
  45 #include <unistd.h>
  46 #include <limits.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <setjmp.h>
  50 #ifdef HAVE_VIS_H
  51 #include <vis.h>
  52 #else
  53 #include "np/vis.h"
  54 #endif
  55 #include "readline/readline.h"
  56 #include "el.h"
  57 #include "fcns.h"               /* for EL_NUM_FCNS */
  58 #include "histedit.h"
  59 #include "filecomplete.h"
  60
  61 void rl_prep_terminal(int);
  62 void rl_deprep_terminal(void);
  63
  64 /* for rl_complete() */
  65 #define TAB             '\r'
  66
  67 /* see comment at the #ifdef for sense of this */
  68 /* #define GDB_411_HACK */
  69
  70 /* readline compatibility stuff - look at readline sources/documentation */
  71 /* to see what these variables mean */
  72 const char *rl_library_version = "EditLine wrapper";
  73 int rl_readline_version = RL_READLINE_VERSION;
  74 static char empty[] = { '\0' };
  75 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  76 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  77     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  78 char *rl_readline_name = empty;
  79 FILE *rl_instream = NULL;
  80 FILE *rl_outstream = NULL;
  81 int rl_point = 0;
  82 int rl_end = 0;
  83 char *rl_line_buffer = NULL;
  84 VCPFunction *rl_linefunc = NULL;
  85 int rl_done = 0;
  86 VFunction *rl_event_hook = NULL;
  87 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  88     emacs_meta_keymap,
  89     emacs_ctlx_keymap;
  90
  91 int history_base = 1;           /* probably never subject to change */
  92 int history_length = 0;
  93 int max_input_history = 0;
  94 char history_expansion_char = '!';
  95 char history_subst_char = '^';
  96 char *history_no_expand_chars = expand_chars;
  97 Function *history_inhibit_expansion_function = NULL;
  98 char *history_arg_extract(int start, int end, const char *str);
  99
 100 int rl_inhibit_completion = 0;
 101 int rl_attempted_completion_over = 0;
 102 char *rl_basic_word_break_characters = break_chars;
 103 char *rl_completer_word_break_characters = NULL;
 104 char *rl_completer_quote_characters = NULL;
 105 Function *rl_completion_entry_function = NULL;
 106 CPPFunction *rl_attempted_completion_function = NULL;
 107 Function *rl_pre_input_hook = NULL;
 108 Function *rl_startup1_hook = NULL;
 109 int (*rl_getc_function)(FILE *) = NULL;
 110 char *rl_terminal_name = NULL;
 111 int rl_already_prompted = 0;
 112 int rl_filename_completion_desired = 0;
 113 int rl_ignore_completion_duplicates = 0;
 114 int rl_catch_signals = 1;
 115 int readline_echoing_p = 1;
 116 int _rl_print_completions_horizontally = 0;
 117 VFunction *rl_redisplay_function = NULL;
 118 Function *rl_startup_hook = NULL;
 119 VFunction *rl_completion_display_matches_hook = NULL;
 120 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 121 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 122 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 123
 124 #ifdef WIDECHAR
 125 static ct_buffer_t conv;
 126 #endif
 127
 128 /*
 129  * The current prompt string.
 130  */
 131 char *rl_prompt = NULL;
 132 /*
 133  * This is set to character indicating type of completion being done by
 134  * rl_complete_internal(); this is available for application completion
 135  * functions.
 136  */
 137 int rl_completion_type = 0;
 138
 139 /*
 140  * If more than this number of items results from query for possible
 141  * completions, we ask user if they are sure to really display the list.
 142  */
 143 int rl_completion_query_items = 100;
 144
 145 /*
 146  * List of characters which are word break characters, but should be left
 147  * in the parsed text when it is passed to the completion function.
 148  * Shell uses this to help determine what kind of completing to do.
 149  */
 150 char *rl_special_prefixes = NULL;
 151
 152 /*
 153  * This is the character appended to the completed words if at the end of
 154  * the line. Default is ' ' (a space).
 155  */
 156 int rl_completion_append_character = ' ';
 157
 158 /* stuff below is used internally by libedit for readline emulation */
 159
 160 static TYPE(History) *h = NULL;
 161 static EditLine *e = NULL;
 162 static Function *map[256];
 163 static jmp_buf topbuf;
 164
 165 /* internal functions */
 166 static unsigned char     _el_rl_complete(EditLine *, int);
 167 static unsigned char     _el_rl_tstp(EditLine *, int);
 168 static char             *_get_prompt(EditLine *);
 169 static int               _getc_function(EditLine *, char *);
 170 static HIST_ENTRY       *_move_history(int);
 171 static int               _history_expand_command(const char *, size_t, size_t,
 172     char **);
 173 static char             *_rl_compat_sub(const char *, const char *,
 174     const char *, int);
 175 static int               _rl_event_read_char(EditLine *, char *);
 176 static void              _rl_update_pos(void);
 177
 178
 179 /* ARGSUSED */
 180 static char *
 181 _get_prompt(EditLine *el __attribute__((__unused__)))
 182 {
 183         rl_already_prompted = 1;
 184         return (rl_prompt);
 185 }
 186
 187
 188 /*
 189  * generic function for moving around history
 190  */
 191 static HIST_ENTRY *
 192 _move_history(int op)
 193 {
 194         TYPE(HistEvent) ev;
 195         static HIST_ENTRY rl_he;
 196
 197         if (FUNW(history)(h, &ev, op) != 0)
 198                 return (HIST_ENTRY *) NULL;
 199
 200         rl_he.line = ct_encode_string(ev.str, &conv);
 201         rl_he.data = NULL;
 202
 203         return (&rl_he);
 204 }
 205
 206
 207 /*
 208  * read one key from user defined input function
 209  */
 210 static int
 211 /*ARGSUSED*/
 212 _getc_function(EditLine *el, char *c)
 213 {
 214         int i;
 215
 216         i = (*rl_getc_function)(NULL);
 217         if (i == -1)
 218                 return 0;
 219         *c = i;
 220         return 1;
 221 }
 222
 223 static const char _dothistory[] = "/.history";
 224
 225 static const char *
 226 _default_history_file(void)
 227 {
 228         struct passwd *p;
 229         static char path[PATH_MAX];
 230
 231         if (*path)
 232                 return path;
 233         if ((p = getpwuid(getuid())) == NULL)
 234                 return NULL;
 235         strlcpy(path, p->pw_dir, PATH_MAX);
 236         strlcat(path, _dothistory, PATH_MAX);
 237         return path;
 238 }
 239
 240 /*
 241  * READLINE compatibility stuff
 242  */
 243
 244 /*
 245  * Set the prompt
 246  */
 247 int
 248 rl_set_prompt(const char *prompt)
 249 {
 250         char *p;
 251
 252         if (!prompt)
 253                 prompt = "";
 254         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 255                 return 0;
 256         if (rl_prompt)
 257                 free(rl_prompt);
 258         rl_prompt = strdup(prompt);
 259         if (rl_prompt == NULL)
 260                 return -1;
 261
 262         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 263                 *p = RL_PROMPT_START_IGNORE;
 264
 265         return 0;
 266 }
 267
 268 /*
 269  * initialize rl compat stuff
 270  */
 271 int
 272 rl_initialize(void)
 273 {
 274         TYPE(HistEvent) ev;
 275         const LineInfo *li;
 276         int editmode = 1;
 277         struct termios t;
 278
 279         if (e != NULL)
 280                 el_end(e);
 281         if (h != NULL)
 282                 FUN(history,end)(h);
 283
 284         if (!rl_instream)
 285                 rl_instream = stdin;
 286         if (!rl_outstream)
 287                 rl_outstream = stdout;
 288
 289         /*
 290          * See if we don't really want to run the editor
 291          */
 292         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 293                 editmode = 0;
 294
 295         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 296
 297         if (!editmode)
 298                 FUN(el,set)(e, EL_EDITMODE, 0);
 299
 300         h = FUN(history,init)();
 301         if (!e || !h)
 302                 return (-1);
 303
 304         FUNW(history)(h, &ev, H_SETSIZE, INT_MAX);      /* unlimited */
 305         history_length = 0;
 306         max_input_history = INT_MAX;
 307         el_set(e, EL_HIST, history, h);
 308
 309         /* setup getc function if valid */
 310         if (rl_getc_function)
 311                 el_set(e, EL_GETCFN, _getc_function);
 312
 313         /* for proper prompt printing in readline() */
 314         if (rl_set_prompt("") == -1) {
 315                 FUN(history,end)(h);
 316                 el_end(e);
 317                 return -1;
 318         }
 319         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 320         el_set(e, EL_SIGNAL, rl_catch_signals);
 321
 322         /* set default mode to "emacs"-style and read setting afterwards */
 323         /* so this can be overriden */
 324         el_set(e, EL_EDITOR, "emacs");
 325         if (rl_terminal_name != NULL)
 326                 el_set(e, EL_TERMINAL, rl_terminal_name);
 327         else
 328                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 329
 330         /*
 331          * Word completion - this has to go AFTER rebinding keys
 332          * to emacs-style.
 333          */
 334         el_set(e, EL_ADDFN, "rl_complete",
 335             "ReadLine compatible completion function",
 336             _el_rl_complete);
 337         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 338
 339         /*
 340          * Send TSTP when ^Z is pressed.
 341          */
 342         el_set(e, EL_ADDFN, "rl_tstp",
 343             "ReadLine compatible suspend function",
 344             _el_rl_tstp);
 345         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 346
 347         /* read settings from configuration file */
 348         el_source(e, NULL);
 349
 350         /*
 351          * Unfortunately, some applications really do use rl_point
 352          * and rl_line_buffer directly.
 353          */
 354         li = el_line(e);
 355         /* a cheesy way to get rid of const cast. */
 356         rl_line_buffer = memchr(li->buffer, *li->buffer, 1);
 357         _rl_update_pos();
 358
 359         if (rl_startup_hook)
 360                 (*rl_startup_hook)(NULL, 0);
 361
 362         return (0);
 363 }
 364
 365
 366 /*
 367  * read one line from input stream and return it, chomping
 368  * trailing newline (if there is any)
 369  */
 370 char *
 371 readline(const char *p)
 372 {
 373         TYPE(HistEvent) ev;
 374         const char * volatile prompt = p;
 375         int count;
 376         const char *ret;
 377         char *buf;
 378         static int used_event_hook;
 379
 380         if (e == NULL || h == NULL)
 381                 rl_initialize();
 382
 383         rl_done = 0;
 384
 385         (void)setjmp(topbuf);
 386
 387         /* update prompt accordingly to what has been passed */
 388         if (rl_set_prompt(prompt) == -1)
 389                 return NULL;
 390
 391         if (rl_pre_input_hook)
 392                 (*rl_pre_input_hook)(NULL, 0);
 393
 394         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 395                 el_set(e, EL_GETCFN, _rl_event_read_char);
 396                 used_event_hook = 1;
 397         }
 398
 399         if (!rl_event_hook && used_event_hook) {
 400                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 401                 used_event_hook = 0;
 402         }
 403
 404         rl_already_prompted = 0;
 405
 406         /* get one line from input stream */
 407         ret = el_gets(e, &count);
 408
 409         if (ret && count > 0) {
 410                 int lastidx;
 411
 412                 buf = strdup(ret);
 413                 if (buf == NULL)
 414                         return NULL;
 415                 lastidx = count - 1;
 416                 if (buf[lastidx] == '\n')
 417                         buf[lastidx] = '\0';
 418         } else
 419                 buf = NULL;
 420
 421         FUNW(history)(h, &ev, H_GETSIZE);
 422         history_length = ev.num;
 423
 424         return buf;
 425 }
 426
 427 /*
 428  * history functions
 429  */
 430
 431 /*
 432  * is normally called before application starts to use
 433  * history expansion functions
 434  */
 435 void
 436 using_history(void)
 437 {
 438         if (h == NULL || e == NULL)
 439                 rl_initialize();
 440 }
 441
 442
 443 /*
 444  * substitute ``what'' with ``with'', returning resulting string; if
 445  * globally == 1, substitutes all occurrences of what, otherwise only the
 446  * first one
 447  */
 448 static char *
 449 _rl_compat_sub(const char *str, const char *what, const char *with,
 450     int globally)
 451 {
 452         const   char    *s;
 453         char    *r, *result;
 454         size_t  len, with_len, what_len;
 455
 456         len = strlen(str);
 457         with_len = strlen(with);
 458         what_len = strlen(what);
 459
 460         /* calculate length we need for result */
 461         s = str;
 462         while (*s) {
 463                 if (*s == *what && !strncmp(s, what, what_len)) {
 464                         len += with_len - what_len;
 465                         if (!globally)
 466                                 break;
 467                         s += what_len;
 468                 } else
 469                         s++;
 470         }
 471         r = result = malloc(len + 1);
 472         if (result == NULL)
 473                 return NULL;
 474         s = str;
 475         while (*s) {
 476                 if (*s == *what && !strncmp(s, what, what_len)) {
 477                         (void)strncpy(r, with, with_len);
 478                         r += with_len;
 479                         s += what_len;
 480                         if (!globally) {
 481                                 (void)strcpy(r, s);
 482                                 return(result);
 483                         }
 484                 } else
 485                         *r++ = *s++;
 486         }
 487         *r = '\0';
 488         return(result);
 489 }
 490
 491 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 492 static  char    *last_search_match;     /* last !?pat[?] that matched */
 493
 494 const char *
 495 get_history_event(const char *cmd, int *cindex, int qchar)
 496 {
 497         int idx, sign, sub, num, begin, ret;
 498         size_t len;
 499         char    *pat;
 500         const char *rptr;
 501         TYPE(HistEvent) ev;
 502
 503         idx = *cindex;
 504         if (cmd[idx++] != history_expansion_char)
 505                 return(NULL);
 506
 507         /* find out which event to take */
 508         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 509                 if (FUNW(history)(h, &ev, H_FIRST) != 0)
 510                         return(NULL);
 511                 *cindex = cmd[idx]? (idx + 1):idx;
 512                 return ct_encode_string(ev.str, &conv);
 513         }
 514         sign = 0;
 515         if (cmd[idx] == '-') {
 516                 sign = 1;
 517                 idx++;
 518         }
 519
 520         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 521                 HIST_ENTRY *rl_he;
 522
 523                 num = 0;
 524                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 525                         num = num * 10 + cmd[idx] - '0';
 526                         idx++;
 527                 }
 528                 if (sign)
 529                         num = history_length - num + 1;
 530
 531                 if (!(rl_he = history_get(num)))
 532                         return(NULL);
 533
 534                 *cindex = idx;
 535                 return(rl_he->line);
 536         }
 537         sub = 0;
 538         if (cmd[idx] == '?') {
 539                 sub = 1;
 540                 idx++;
 541         }
 542         begin = idx;
 543         while (cmd[idx]) {
 544                 if (cmd[idx] == '\n')
 545                         break;
 546                 if (sub && cmd[idx] == '?')
 547                         break;
 548                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 549                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 550                         break;
 551                 idx++;
 552         }
 553         len = idx - begin;
 554         if (sub && cmd[idx] == '?')
 555                 idx++;
 556         if (sub && len == 0 && last_search_pat && *last_search_pat)
 557                 pat = last_search_pat;
 558         else if (len == 0)
 559                 return(NULL);
 560         else {
 561                 if ((pat = malloc(len + 1)) == NULL)
 562                         return NULL;
 563                 (void)strncpy(pat, cmd + begin, len);
 564                 pat[len] = '\0';
 565         }
 566
 567         if (FUNW(history)(h, &ev, H_CURR) != 0) {
 568                 if (pat != last_search_pat)
 569                         free(pat);
 570                 return (NULL);
 571         }
 572         num = ev.num;
 573
 574         if (sub) {
 575                 if (pat != last_search_pat) {
 576                         if (last_search_pat)
 577                                 free(last_search_pat);
 578                         last_search_pat = pat;
 579                 }
 580                 ret = history_search(pat, -1);
 581         } else
 582                 ret = history_search_prefix(pat, -1);
 583
 584         if (ret == -1) {
 585                 /* restore to end of list on failed search */
 586                 FUNW(history)(h, &ev, H_FIRST);
 587                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 588                 if (pat != last_search_pat)
 589                         free(pat);
 590                 return(NULL);
 591         }
 592
 593         if (sub && len) {
 594                 if (last_search_match && last_search_match != pat)
 595                         free(last_search_match);
 596                 last_search_match = pat;
 597         }
 598
 599         if (pat != last_search_pat)
 600                 free(pat);
 601
 602         if (FUNW(history)(h, &ev, H_CURR) != 0)
 603                 return(NULL);
 604         *cindex = idx;
 605         rptr = ct_encode_string(ev.str, &conv);
 606
 607         /* roll back to original position */
 608         (void)FUNW(history)(h, &ev, H_SET, num);
 609
 610         return rptr;
 611 }
 612
 613 /*
 614  * the real function doing history expansion - takes as argument command
 615  * to do and data upon which the command should be executed
 616  * does expansion the way I've understood readline documentation
 617  *
 618  * returns 0 if data was not modified, 1 if it was and 2 if the string
 619  * should be only printed and not executed; in case of error,
 620  * returns -1 and *result points to NULL
 621  * it's callers responsibility to free() string returned in *result
 622  */
 623 static int
 624 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 625     char **result)
 626 {
 627         char *tmp, *search = NULL, *aptr;
 628         const char *ptr, *cmd;
 629         static char *from = NULL, *to = NULL;
 630         int start, end, idx, has_mods = 0;
 631         int p_on = 0, g_on = 0;
 632
 633         *result = NULL;
 634         aptr = NULL;
 635         ptr = NULL;
 636
 637         /* First get event specifier */
 638         idx = 0;
 639
 640         if (strchr(":^*$", command[offs + 1])) {
 641                 char str[4];
 642                 /*
 643                 * "!:" is shorthand for "!!:".
 644                 * "!^", "!*" and "!$" are shorthand for
 645                 * "!!:^", "!!:*" and "!!:$" respectively.
 646                 */
 647                 str[0] = str[1] = '!';
 648                 str[2] = '0';
 649                 ptr = get_history_event(str, &idx, 0);
 650                 idx = (command[offs + 1] == ':')? 1:0;
 651                 has_mods = 1;
 652         } else {
 653                 if (command[offs + 1] == '#') {
 654                         /* use command so far */
 655                         if ((aptr = malloc(offs + 1)) == NULL)
 656                                 return -1;
 657                         (void)strncpy(aptr, command, offs);
 658                         aptr[offs] = '\0';
 659                         idx = 1;
 660                 } else {
 661                         int     qchar;
 662
 663                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 664                         ptr = get_history_event(command + offs, &idx, qchar);
 665                 }
 666                 has_mods = command[offs + idx] == ':';
 667         }
 668
 669         if (ptr == NULL && aptr == NULL)
 670                 return(-1);
 671
 672         if (!has_mods) {
 673                 *result = strdup(aptr ? aptr : ptr);
 674                 if (aptr)
 675                         free(aptr);
 676                 if (*result == NULL)
 677                         return -1;
 678                 return(1);
 679         }
 680
 681         cmd = command + offs + idx + 1;
 682
 683         /* Now parse any word designators */
 684
 685         if (*cmd == '%')        /* last word matched by ?pat? */
 686                 tmp = strdup(last_search_match? last_search_match:"");
 687         else if (strchr("^*$-0123456789", *cmd)) {
 688                 start = end = -1;
 689                 if (*cmd == '^')
 690                         start = end = 1, cmd++;
 691                 else if (*cmd == '$')
 692                         start = -1, cmd++;
 693                 else if (*cmd == '*')
 694                         start = 1, cmd++;
 695                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 696                         start = 0;
 697                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 698                                 start = start * 10 + *cmd++ - '0';
 699
 700                         if (*cmd == '-') {
 701                                 if (isdigit((unsigned char) cmd[1])) {
 702                                         cmd++;
 703                                         end = 0;
 704                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 705                                                 end = end * 10 + *cmd++ - '0';
 706                                 } else if (cmd[1] == '$') {
 707                                         cmd += 2;
 708                                         end = -1;
 709                                 } else {
 710                                         cmd++;
 711                                         end = -2;
 712                                 }
 713                         } else if (*cmd == '*')
 714                                 end = -1, cmd++;
 715                         else
 716                                 end = start;
 717                 }
 718                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 719                 if (tmp == NULL) {
 720                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 721                             command + offs + idx);
 722                         if (aptr)
 723                                 free(aptr);
 724                         return(-1);
 725                 }
 726         } else
 727                 tmp = strdup(aptr? aptr:ptr);
 728
 729         if (aptr)
 730                 free(aptr);
 731
 732         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 733                 *result = tmp;
 734                 return(1);
 735         }
 736
 737         for (; *cmd; cmd++) {
 738                 if (*cmd == ':')
 739                         continue;
 740                 else if (*cmd == 'h') {         /* remove trailing path */
 741                         if ((aptr = strrchr(tmp, '/')) != NULL)
 742                                 *aptr = '\0';
 743                 } else if (*cmd == 't') {       /* remove leading path */
 744                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 745                                 aptr = strdup(aptr + 1);
 746                                 free(tmp);
 747                                 tmp = aptr;
 748                         }
 749                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 750                         if ((aptr = strrchr(tmp, '.')) != NULL)
 751                                 *aptr = '\0';
 752                 } else if (*cmd == 'e') {       /* remove all but suffix */
 753                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 754                                 aptr = strdup(aptr);
 755                                 free(tmp);
 756                                 tmp = aptr;
 757                         }
 758                 } else if (*cmd == 'p')         /* print only */
 759                         p_on = 1;
 760                 else if (*cmd == 'g')
 761                         g_on = 2;
 762                 else if (*cmd == 's' || *cmd == '&') {
 763                         char *what, *with, delim;
 764                         size_t len, from_len;
 765                         size_t size;
 766
 767                         if (*cmd == '&' && (from == NULL || to == NULL))
 768                                 continue;
 769                         else if (*cmd == 's') {
 770                                 delim = *(++cmd), cmd++;
 771                                 size = 16;
 772                                 what = realloc(from, size);
 773                                 if (what == NULL) {
 774                                         free(from);
 775                                         free(tmp);
 776                                         return 0;
 777                                 }
 778                                 len = 0;
 779                                 for (; *cmd && *cmd != delim; cmd++) {
 780                                         if (*cmd == '\\' && cmd[1] == delim)
 781                                                 cmd++;
 782                                         if (len >= size) {
 783                                                 char *nwhat;
 784                                                 nwhat = realloc(what,
 785                                                                 (size <<= 1));
 786                                                 if (nwhat == NULL) {
 787                                                         free(what);
 788                                                         free(tmp);
 789                                                         return 0;
 790                                                 }
 791                                                 what = nwhat;
 792                                         }
 793                                         what[len++] = *cmd;
 794                                 }
 795                                 what[len] = '\0';
 796                                 from = what;
 797                                 if (*what == '\0') {
 798                                         free(what);
 799                                         if (search) {
 800                                                 from = strdup(search);
 801                                                 if (from == NULL) {
 802                                                         free(tmp);
 803                                                         return 0;
 804                                                 }
 805                                         } else {
 806                                                 from = NULL;
 807                                                 free(tmp);
 808                                                 return (-1);
 809                                         }
 810                                 }
 811                                 cmd++;  /* shift after delim */
 812                                 if (!*cmd)
 813                                         continue;
 814
 815                                 size = 16;
 816                                 with = realloc(to, size);
 817                                 if (with == NULL) {
 818                                         free(to);
 819                                         free(tmp);
 820                                         return -1;
 821                                 }
 822                                 len = 0;
 823                                 from_len = strlen(from);
 824                                 for (; *cmd && *cmd != delim; cmd++) {
 825                                         if (len + from_len + 1 >= size) {
 826                                                 char *nwith;
 827                                                 size += from_len + 1;
 828                                                 nwith = realloc(with, size);
 829                                                 if (nwith == NULL) {
 830                                                         free(with);
 831                                                         free(tmp);
 832                                                         return -1;
 833                                                 }
 834                                                 with = nwith;
 835                                         }
 836                                         if (*cmd == '&') {
 837                                                 /* safe */
 838                                                 (void)strcpy(&with[len], from);
 839                                                 len += from_len;
 840                                                 continue;
 841                                         }
 842                                         if (*cmd == '\\'
 843                                             && (*(cmd + 1) == delim
 844                                                 || *(cmd + 1) == '&'))
 845                                                 cmd++;
 846                                         with[len++] = *cmd;
 847                                 }
 848                                 with[len] = '\0';
 849                                 to = with;
 850                         }
 851
 852                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 853                         if (aptr) {
 854                                 free(tmp);
 855                                 tmp = aptr;
 856                         }
 857                         g_on = 0;
 858                 }
 859         }
 860         *result = tmp;
 861         return (p_on? 2:1);
 862 }
 863
 864
 865 /*
 866  * csh-style history expansion
 867  */
 868 int
 869 history_expand(char *str, char **output)
 870 {
 871         int ret = 0;
 872         size_t idx, i, size;
 873         char *tmp, *result;
 874
 875         if (h == NULL || e == NULL)
 876                 rl_initialize();
 877
 878         if (history_expansion_char == 0) {
 879                 *output = strdup(str);
 880                 return(0);
 881         }
 882
 883         *output = NULL;
 884         if (str[0] == history_subst_char) {
 885                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 886                 *output = malloc(strlen(str) + 4 + 1);
 887                 if (*output == NULL)
 888                         return 0;
 889                 (*output)[0] = (*output)[1] = history_expansion_char;
 890                 (*output)[2] = ':';
 891                 (*output)[3] = 's';
 892                 (void)strcpy((*output) + 4, str);
 893                 str = *output;
 894         } else {
 895                 *output = strdup(str);
 896                 if (*output == NULL)
 897                         return 0;
 898         }
 899
 900 #define ADD_STRING(what, len, fr)                                       \
 901         {                                                               \
 902                 if (idx + len + 1 > size) {                             \
 903                         char *nresult = realloc(result, (size += len + 1));\
 904                         if (nresult == NULL) {                          \
 905                                 free(*output);                          \
 906                                 if (/*CONSTCOND*/fr)                    \
 907                                         free(tmp);                      \
 908                                 return 0;                               \
 909                         }                                               \
 910                         result = nresult;                               \
 911                 }                                                       \
 912                 (void)strncpy(&result[idx], what, len);                 \
 913                 idx += len;                                             \
 914                 result[idx] = '\0';                                     \
 915         }
 916
 917         result = NULL;
 918         size = idx = 0;
 919         tmp = NULL;
 920         for (i = 0; str[i];) {
 921                 int qchar, loop_again;
 922                 size_t len, start, j;
 923
 924                 qchar = 0;
 925                 loop_again = 1;
 926                 start = j = i;
 927 loop:
 928                 for (; str[j]; j++) {
 929                         if (str[j] == '\\' &&
 930                             str[j + 1] == history_expansion_char) {
 931                                 (void)strcpy(&str[j], &str[j + 1]);
 932                                 continue;
 933                         }
 934                         if (!loop_again) {
 935                                 if (isspace((unsigned char) str[j])
 936                                     || str[j] == qchar)
 937                                         break;
 938                         }
 939                         if (str[j] == history_expansion_char
 940                             && !strchr(history_no_expand_chars, str[j + 1])
 941                             && (!history_inhibit_expansion_function ||
 942                             (*history_inhibit_expansion_function)(str,
 943                             (int)j) == 0))
 944                                 break;
 945                 }
 946
 947                 if (str[j] && loop_again) {
 948                         i = j;
 949                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
 950                         j++;
 951                         if (str[j] == history_expansion_char)
 952                                 j++;
 953                         loop_again = 0;
 954                         goto loop;
 955                 }
 956                 len = i - start;
 957                 ADD_STRING(&str[start], len, 0);
 958
 959                 if (str[i] == '\0' || str[i] != history_expansion_char) {
 960                         len = j - i;
 961                         ADD_STRING(&str[i], len, 0);
 962                         if (start == 0)
 963                                 ret = 0;
 964                         else
 965                                 ret = 1;
 966                         break;
 967                 }
 968                 ret = _history_expand_command (str, i, (j - i), &tmp);
 969                 if (ret > 0 && tmp) {
 970                         len = strlen(tmp);
 971                         ADD_STRING(tmp, len, 1);
 972                 }
 973                 if (tmp) {
 974                         free(tmp);
 975                         tmp = NULL;
 976                 }
 977                 i = j;
 978         }
 979
 980         /* ret is 2 for "print only" option */
 981         if (ret == 2) {
 982                 add_history(result);
 983 #ifdef GDB_411_HACK
 984                 /* gdb 4.11 has been shipped with readline, where */
 985                 /* history_expand() returned -1 when the line     */
 986                 /* should not be executed; in readline 2.1+       */
 987                 /* it should return 2 in such a case              */
 988                 ret = -1;
 989 #endif
 990         }
 991         free(*output);
 992         *output = result;
 993
 994         return (ret);
 995 }
 996
 997 /*
 998 * Return a string consisting of arguments of "str" from "start" to "end".
 999 */
1000 char *
1001 history_arg_extract(int start, int end, const char *str)
1002 {
1003         size_t  i, len, max;
1004         char    **arr, *result = NULL;
1005
1006         arr = history_tokenize(str);
1007         if (!arr)
1008                 return NULL;
1009         if (arr && *arr == NULL)
1010                 goto out;
1011
1012         for (max = 0; arr[max]; max++)
1013                 continue;
1014         max--;
1015
1016         if (start == '$')
1017                 start = (int)max;
1018         if (end == '$')
1019                 end = (int)max;
1020         if (end < 0)
1021                 end = (int)max + end + 1;
1022         if (start < 0)
1023                 start = end;
1024
1025         if (start < 0 || end < 0 || (size_t)start > max ||
1026             (size_t)end > max || start > end)
1027                 goto out;
1028
1029         for (i = start, len = 0; i <= (size_t)end; i++)
1030                 len += strlen(arr[i]) + 1;
1031         len++;
1032         result = malloc(len);
1033         if (result == NULL)
1034                 goto out;
1035
1036         for (i = start, len = 0; i <= (size_t)end; i++) {
1037                 (void)strcpy(result + len, arr[i]);
1038                 len += strlen(arr[i]);
1039                 if (i < (size_t)end)
1040                         result[len++] = ' ';
1041         }
1042         result[len] = '\0';
1043
1044 out:
1045         for (i = 0; arr[i]; i++)
1046                 free(arr[i]);
1047         free(arr);
1048
1049         return result;
1050 }
1051
1052 /*
1053  * Parse the string into individual tokens,
1054  * similar to how shell would do it.
1055  */
1056 char **
1057 history_tokenize(const char *str)
1058 {
1059         int size = 1, idx = 0, i, start;
1060         size_t len;
1061         char **result = NULL, *temp, delim = '\0';
1062
1063         for (i = 0; str[i];) {
1064                 while (isspace((unsigned char) str[i]))
1065                         i++;
1066                 start = i;
1067                 for (; str[i];) {
1068                         if (str[i] == '\\') {
1069                                 if (str[i+1] != '\0')
1070                                         i++;
1071                         } else if (str[i] == delim)
1072                                 delim = '\0';
1073                         else if (!delim &&
1074                                     (isspace((unsigned char) str[i]) ||
1075                                 strchr("()<>;&|$", str[i])))
1076                                 break;
1077                         else if (!delim && strchr("'`\"", str[i]))
1078                                 delim = str[i];
1079                         if (str[i])
1080                                 i++;
1081                 }
1082
1083                 if (idx + 2 >= size) {
1084                         char **nresult;
1085                         size <<= 1;
1086                         nresult = realloc(result, size * sizeof(char *));
1087                         if (nresult == NULL) {
1088                                 free(result);
1089                                 return NULL;
1090                         }
1091                         result = nresult;
1092                 }
1093                 len = i - start;
1094                 temp = malloc(len + 1);
1095                 if (temp == NULL) {
1096                         for (i = 0; i < idx; i++)
1097                                 free(result[i]);
1098                         free(result);
1099                         return NULL;
1100                 }
1101                 (void)strncpy(temp, &str[start], len);
1102                 temp[len] = '\0';
1103                 result[idx++] = temp;
1104                 result[idx] = NULL;
1105                 if (str[i])
1106                         i++;
1107         }
1108         return (result);
1109 }
1110
1111
1112 /*
1113  * limit size of history record to ``max'' events
1114  */
1115 void
1116 stifle_history(int max)
1117 {
1118         TYPE(HistEvent) ev;
1119
1120         if (h == NULL || e == NULL)
1121                 rl_initialize();
1122
1123         if (FUNW(history)(h, &ev, H_SETSIZE, max) == 0)
1124                 max_input_history = max;
1125 }
1126
1127
1128 /*
1129  * "unlimit" size of history - set the limit to maximum allowed int value
1130  */
1131 int
1132 unstifle_history(void)
1133 {
1134         TYPE(HistEvent) ev;
1135         int omax;
1136
1137         FUNW(history)(h, &ev, H_SETSIZE, INT_MAX);
1138         omax = max_input_history;
1139         max_input_history = INT_MAX;
1140         return (omax);          /* some value _must_ be returned */
1141 }
1142
1143
1144 int
1145 history_is_stifled(void)
1146 {
1147
1148         /* cannot return true answer */
1149         return (max_input_history != INT_MAX);
1150 }
1151
1152 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1153
1154 int
1155 history_truncate_file (const char *filename, int nlines)
1156 {
1157         int ret = 0;
1158         FILE *fp, *tp;
1159         char template[sizeof(_history_tmp_template)];
1160         char buf[4096];
1161         int fd;
1162         char *cp;
1163         off_t off;
1164         int count = 0;
1165         ssize_t left = 0;
1166
1167         if (filename == NULL && (filename = _default_history_file()) == NULL)
1168                 return errno;
1169         if ((fp = fopen(filename, "r+")) == NULL)
1170                 return errno;
1171         strcpy(template, _history_tmp_template);
1172         if ((fd = mkstemp(template)) == -1) {
1173                 ret = errno;
1174                 goto out1;
1175         }
1176
1177         if ((tp = fdopen(fd, "r+")) == NULL) {
1178                 close(fd);
1179                 ret = errno;
1180                 goto out2;
1181         }
1182
1183         for(;;) {
1184                 if (fread(buf, sizeof(buf), 1, fp) != 1) {
1185                         if (ferror(fp)) {
1186                                 ret = errno;
1187                                 break;
1188                         }
1189                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1190                             (off_t)-1) {
1191                                 ret = errno;
1192                                 break;
1193                         }
1194                         left = fread(buf, 1, sizeof(buf), fp);
1195                         if (ferror(fp)) {
1196                                 ret = errno;
1197                                 break;
1198                         }
1199                         if (left == 0) {
1200                                 count--;
1201                                 left = sizeof(buf);
1202                         } else if (fwrite(buf, (size_t)left, 1, tp) != 1) {
1203                                 ret = errno;
1204                                 break;
1205                         }
1206                         fflush(tp);
1207                         break;
1208                 }
1209                 if (fwrite(buf, sizeof(buf), 1, tp) != 1) {
1210                         ret = errno;
1211                         break;
1212                 }
1213                 count++;
1214         }
1215         if (ret)
1216                 goto out3;
1217         cp = buf + left - 1;
1218         if(*cp != '\n')
1219                 cp++;
1220         for(;;) {
1221                 while (--cp >= buf) {
1222                         if (*cp == '\n') {
1223                                 if (--nlines == 0) {
1224                                         if (++cp >= buf + sizeof(buf)) {
1225                                                 count++;
1226                                                 cp = buf;
1227                                         }
1228                                         break;
1229                                 }
1230                         }
1231                 }
1232                 if (nlines <= 0 || count == 0)
1233                         break;
1234                 count--;
1235                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1236                         ret = errno;
1237                         break;
1238                 }
1239                 if (fread(buf, sizeof(buf), 1, tp) != 1) {
1240                         if (ferror(tp)) {
1241                                 ret = errno;
1242                                 break;
1243                         }
1244                         ret = EAGAIN;
1245                         break;
1246                 }
1247                 cp = buf + sizeof(buf);
1248         }
1249
1250         if (ret || nlines > 0)
1251                 goto out3;
1252
1253         if (fseeko(fp, 0, SEEK_SET) == (off_t)-1) {
1254                 ret = errno;
1255                 goto out3;
1256         }
1257
1258         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1259             (off_t)-1) {
1260                 ret = errno;
1261                 goto out3;
1262         }
1263
1264         for(;;) {
1265                 if ((left = fread(buf, 1, sizeof(buf), tp)) == 0) {
1266                         if (ferror(fp))
1267                                 ret = errno;
1268                         break;
1269                 }
1270                 if (fwrite(buf, (size_t)left, 1, fp) != 1) {
1271                         ret = errno;
1272                         break;
1273                 }
1274         }
1275         fflush(fp);
1276         if((off = ftello(fp)) > 0)
1277                 (void)ftruncate(fileno(fp), off);
1278 out3:
1279         fclose(tp);
1280 out2:
1281         unlink(template);
1282 out1:
1283         fclose(fp);
1284
1285         return ret;
1286 }
1287
1288
1289 /*
1290  * read history from a file given
1291  */
1292 int
1293 read_history(const char *filename)
1294 {
1295         TYPE(HistEvent) ev;
1296
1297         if (h == NULL || e == NULL)
1298                 rl_initialize();
1299         if (filename == NULL && (filename = _default_history_file()) == NULL)
1300                 return errno;
1301         return (FUNW(history)(h, &ev, H_LOAD, filename) == -1 ?
1302             (errno ? errno : EINVAL) : 0);
1303 }
1304
1305
1306 /*
1307  * write history to a file given
1308  */
1309 int
1310 write_history(const char *filename)
1311 {
1312         TYPE(HistEvent) ev;
1313
1314         if (h == NULL || e == NULL)
1315                 rl_initialize();
1316         if (filename == NULL && (filename = _default_history_file()) == NULL)
1317                 return errno;
1318         return (FUNW(history)(h, &ev, H_SAVE, filename) == -1 ?
1319             (errno ? errno : EINVAL) : 0);
1320 }
1321
1322
1323 /*
1324  * returns history ``num''th event
1325  *
1326  * returned pointer points to static variable
1327  */
1328 HIST_ENTRY *
1329 history_get(int num)
1330 {
1331         static HIST_ENTRY she;
1332         TYPE(HistEvent) ev;
1333         int curr_num;
1334
1335         if (h == NULL || e == NULL)
1336                 rl_initialize();
1337
1338         /* save current position */
1339         if (FUNW(history)(h, &ev, H_CURR) != 0)
1340                 return (NULL);
1341         curr_num = ev.num;
1342
1343         /* start from the oldest */
1344         if (FUNW(history)(h, &ev, H_LAST) != 0)
1345                 return (NULL);  /* error */
1346
1347         /* look forwards for event matching specified offset */
1348         if (FUNW(history)(h, &ev, H_NEXT_EVDATA, num, &she.data))
1349                 return (NULL);
1350
1351         she.line = ct_encode_string(ev.str, &conv);
1352
1353         /* restore pointer to where it was */
1354         (void)FUNW(history)(h, &ev, H_SET, curr_num);
1355
1356         return (&she);
1357 }
1358
1359
1360 /*
1361  * add the line to history table
1362  */
1363 int
1364 add_history(const char *line)
1365 {
1366         TYPE(HistEvent) ev;
1367
1368         if (h == NULL || e == NULL)
1369                 rl_initialize();
1370
1371         (void)FUNW(history)(h, &ev, H_ENTER, line);
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);
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 }