lib/libedit/readline.c

   1 /*      $NetBSD: readline.c,v 1.117 2015/06/02 15:35:31 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 1.117 2015/06/02 15:35:31 christos Exp $");
  35 #endif /* not lint && not SCCSID */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <stdio.h>
  42 #include <dirent.h>
  43 #include <string.h>
  44 #include <pwd.h>
  45 #include <ctype.h>
  46 #include <stdlib.h>
  47 #include <unistd.h>
  48 #include <limits.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <setjmp.h>
  52 #include <vis.h>
  53
  54 #include "readline/readline.h"
  55 #include "el.h"
  56 #include "fcns.h"               /* for EL_NUM_FCNS */
  57 #include "histedit.h"
  58 #include "filecomplete.h"
  59
  60 void rl_prep_terminal(int);
  61 void rl_deprep_terminal(void);
  62
  63 /* for rl_complete() */
  64 #define TAB             '\r'
  65
  66 /* see comment at the #ifdef for sense of this */
  67 /* #define GDB_411_HACK */
  68
  69 /* readline compatibility stuff - look at readline sources/documentation */
  70 /* to see what these variables mean */
  71 const char *rl_library_version = "EditLine wrapper";
  72 int rl_readline_version = RL_READLINE_VERSION;
  73 static char empty[] = { '\0' };
  74 static char expand_chars[] = { ' ', '\t', '\n', '=', '(', '\0' };
  75 static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$',
  76     '>', '<', '=', ';', '|', '&', '{', '(', '\0' };
  77 char *rl_readline_name = empty;
  78 FILE *rl_instream = NULL;
  79 FILE *rl_outstream = NULL;
  80 int rl_point = 0;
  81 int rl_end = 0;
  82 char *rl_line_buffer = NULL;
  83 rl_vcpfunc_t *rl_linefunc = NULL;
  84 int rl_done = 0;
  85 VFunction *rl_event_hook = NULL;
  86 KEYMAP_ENTRY_ARRAY emacs_standard_keymap,
  87     emacs_meta_keymap,
  88     emacs_ctlx_keymap;
  89 /*
  90  * The following is not implemented; we always catch signals in the
  91  * libedit fashion: set handlers on entry to el_gets() and clear them
  92  * on the way out. This simplistic approach works for most cases; if
  93  * it does not work for your application, please let us know.
  94  */
  95 int rl_catch_signals = 1;
  96 int rl_catch_sigwinch = 1;
  97
  98 int history_base = 1;           /* probably never subject to change */
  99 int history_length = 0;
 100 int max_input_history = 0;
 101 char history_expansion_char = '!';
 102 char history_subst_char = '^';
 103 char *history_no_expand_chars = expand_chars;
 104 Function *history_inhibit_expansion_function = NULL;
 105 char *history_arg_extract(int start, int end, const char *str);
 106
 107 int rl_inhibit_completion = 0;
 108 int rl_attempted_completion_over = 0;
 109 char *rl_basic_word_break_characters = break_chars;
 110 char *rl_completer_word_break_characters = NULL;
 111 char *rl_completer_quote_characters = NULL;
 112 rl_compentry_func_t *rl_completion_entry_function = NULL;
 113 char *(*rl_completion_word_break_hook)(void) = NULL;
 114 rl_completion_func_t *rl_attempted_completion_function = NULL;
 115 Function *rl_pre_input_hook = NULL;
 116 Function *rl_startup1_hook = NULL;
 117 int (*rl_getc_function)(FILE *) = NULL;
 118 char *rl_terminal_name = NULL;
 119 int rl_already_prompted = 0;
 120 int rl_filename_completion_desired = 0;
 121 int rl_ignore_completion_duplicates = 0;
 122 int readline_echoing_p = 1;
 123 int _rl_print_completions_horizontally = 0;
 124 VFunction *rl_redisplay_function = NULL;
 125 Function *rl_startup_hook = NULL;
 126 VFunction *rl_completion_display_matches_hook = NULL;
 127 VFunction *rl_prep_term_function = (VFunction *)rl_prep_terminal;
 128 VFunction *rl_deprep_term_function = (VFunction *)rl_deprep_terminal;
 129 KEYMAP_ENTRY_ARRAY emacs_meta_keymap;
 130
 131 /*
 132  * The current prompt string.
 133  */
 134 char *rl_prompt = NULL;
 135 /*
 136  * This is set to character indicating type of completion being done by
 137  * rl_complete_internal(); this is available for application completion
 138  * functions.
 139  */
 140 int rl_completion_type = 0;
 141
 142 /*
 143  * If more than this number of items results from query for possible
 144  * completions, we ask user if they are sure to really display the list.
 145  */
 146 int rl_completion_query_items = 100;
 147
 148 /*
 149  * List of characters which are word break characters, but should be left
 150  * in the parsed text when it is passed to the completion function.
 151  * Shell uses this to help determine what kind of completing to do.
 152  */
 153 char *rl_special_prefixes = NULL;
 154
 155 /*
 156  * This is the character appended to the completed words if at the end of
 157  * the line. Default is ' ' (a space).
 158  */
 159 int rl_completion_append_character = ' ';
 160
 161 /* stuff below is used internally by libedit for readline emulation */
 162
 163 static History *h = NULL;
 164 static EditLine *e = NULL;
 165 static rl_command_func_t *map[256];
 166 static jmp_buf topbuf;
 167
 168 /* internal functions */
 169 static unsigned char     _el_rl_complete(EditLine *, int);
 170 static unsigned char     _el_rl_tstp(EditLine *, int);
 171 static char             *_get_prompt(EditLine *);
 172 static int               _getc_function(EditLine *, char *);
 173 static HIST_ENTRY       *_move_history(int);
 174 static int               _history_expand_command(const char *, size_t, size_t,
 175     char **);
 176 static char             *_rl_compat_sub(const char *, const char *,
 177     const char *, int);
 178 static int               _rl_event_read_char(EditLine *, char *);
 179 static void              _rl_update_pos(void);
 180
 181
 182 /* ARGSUSED */
 183 static char *
 184 _get_prompt(EditLine *el __attribute__((__unused__)))
 185 {
 186         rl_already_prompted = 1;
 187         return rl_prompt;
 188 }
 189
 190
 191 /*
 192  * generic function for moving around history
 193  */
 194 static HIST_ENTRY *
 195 _move_history(int op)
 196 {
 197         HistEvent ev;
 198         static HIST_ENTRY rl_he;
 199
 200         if (history(h, &ev, op) != 0)
 201                 return NULL;
 202
 203         rl_he.line = ev.str;
 204         rl_he.data = NULL;
 205
 206         return &rl_he;
 207 }
 208
 209
 210 /*
 211  * read one key from user defined input function
 212  */
 213 static int
 214 /*ARGSUSED*/
 215 _getc_function(EditLine *el __attribute__((__unused__)), char *c)
 216 {
 217         int i;
 218
 219         i = (*rl_getc_function)(NULL);
 220         if (i == -1)
 221                 return 0;
 222         *c = (char)i;
 223         return 1;
 224 }
 225
 226 static void
 227 _resize_fun(EditLine *el, void *a)
 228 {
 229         const LineInfo *li;
 230         char **ap = a;
 231
 232         li = el_line(el);
 233         /* a cheesy way to get rid of const cast. */
 234         *ap = memchr(li->buffer, *li->buffer, (size_t)1);
 235 }
 236
 237 static const char *
 238 _default_history_file(void)
 239 {
 240         struct passwd *p;
 241         static char *path;
 242         size_t len;
 243
 244         if (path)
 245                 return path;
 246
 247         if ((p = getpwuid(getuid())) == NULL)
 248                 return NULL;
 249
 250         len = strlen(p->pw_dir) + sizeof("/.history");
 251         if ((path = malloc(len)) == NULL)
 252                 return NULL;
 253
 254         (void)snprintf(path, len, "%s/.history", p->pw_dir);
 255         return path;
 256 }
 257
 258 /*
 259  * READLINE compatibility stuff
 260  */
 261
 262 /*
 263  * Set the prompt
 264  */
 265 int
 266 rl_set_prompt(const char *prompt)
 267 {
 268         char *p;
 269
 270         if (!prompt)
 271                 prompt = "";
 272         if (rl_prompt != NULL && strcmp(rl_prompt, prompt) == 0)
 273                 return 0;
 274         if (rl_prompt)
 275                 el_free(rl_prompt);
 276         rl_prompt = strdup(prompt);
 277         if (rl_prompt == NULL)
 278                 return -1;
 279
 280         while ((p = strchr(rl_prompt, RL_PROMPT_END_IGNORE)) != NULL)
 281                 *p = RL_PROMPT_START_IGNORE;
 282
 283         return 0;
 284 }
 285
 286 /*
 287  * initialize rl compat stuff
 288  */
 289 int
 290 rl_initialize(void)
 291 {
 292         HistEvent ev;
 293         int editmode = 1;
 294         struct termios t;
 295
 296         if (e != NULL)
 297                 el_end(e);
 298         if (h != NULL)
 299                 history_end(h);
 300
 301         if (!rl_instream)
 302                 rl_instream = stdin;
 303         if (!rl_outstream)
 304                 rl_outstream = stdout;
 305
 306         /*
 307          * See if we don't really want to run the editor
 308          */
 309         if (tcgetattr(fileno(rl_instream), &t) != -1 && (t.c_lflag & ECHO) == 0)
 310                 editmode = 0;
 311
 312         e = el_init(rl_readline_name, rl_instream, rl_outstream, stderr);
 313
 314         if (!editmode)
 315                 el_set(e, EL_EDITMODE, 0);
 316
 317         h = history_init();
 318         if (!e || !h)
 319                 return -1;
 320
 321         history(h, &ev, H_SETSIZE, INT_MAX);    /* unlimited */
 322         history_length = 0;
 323         max_input_history = INT_MAX;
 324         el_set(e, EL_HIST, history, h);
 325
 326         /* Setup resize function */
 327         el_set(e, EL_RESIZE, _resize_fun, &rl_line_buffer);
 328
 329         /* setup getc function if valid */
 330         if (rl_getc_function)
 331                 el_set(e, EL_GETCFN, _getc_function);
 332
 333         /* for proper prompt printing in readline() */
 334         if (rl_set_prompt("") == -1) {
 335                 history_end(h);
 336                 el_end(e);
 337                 return -1;
 338         }
 339         el_set(e, EL_PROMPT, _get_prompt, RL_PROMPT_START_IGNORE);
 340         el_set(e, EL_SIGNAL, rl_catch_signals);
 341
 342         /* set default mode to "emacs"-style and read setting afterwards */
 343         /* so this can be overridden */
 344         el_set(e, EL_EDITOR, "emacs");
 345         if (rl_terminal_name != NULL)
 346                 el_set(e, EL_TERMINAL, rl_terminal_name);
 347         else
 348                 el_get(e, EL_TERMINAL, &rl_terminal_name);
 349
 350         /*
 351          * Word completion - this has to go AFTER rebinding keys
 352          * to emacs-style.
 353          */
 354         el_set(e, EL_ADDFN, "rl_complete",
 355             "ReadLine compatible completion function",
 356             _el_rl_complete);
 357         el_set(e, EL_BIND, "^I", "rl_complete", NULL);
 358
 359         /*
 360          * Send TSTP when ^Z is pressed.
 361          */
 362         el_set(e, EL_ADDFN, "rl_tstp",
 363             "ReadLine compatible suspend function",
 364             _el_rl_tstp);
 365         el_set(e, EL_BIND, "^Z", "rl_tstp", NULL);
 366
 367         /*
 368          * Set some readline compatible key-bindings.
 369          */
 370         el_set(e, EL_BIND, "^R", "em-inc-search-prev", NULL);
 371
 372         /*
 373          * Allow the use of Home/End keys.
 374          */
 375         el_set(e, EL_BIND, "\\e[1~", "ed-move-to-beg", NULL);
 376         el_set(e, EL_BIND, "\\e[4~", "ed-move-to-end", NULL);
 377         el_set(e, EL_BIND, "\\e[7~", "ed-move-to-beg", NULL);
 378         el_set(e, EL_BIND, "\\e[8~", "ed-move-to-end", NULL);
 379         el_set(e, EL_BIND, "\\e[H", "ed-move-to-beg", NULL);
 380         el_set(e, EL_BIND, "\\e[F", "ed-move-to-end", NULL);
 381
 382         /*
 383          * Allow the use of the Delete/Insert keys.
 384          */
 385         el_set(e, EL_BIND, "\\e[3~", "ed-delete-next-char", NULL);
 386         el_set(e, EL_BIND, "\\e[2~", "ed-quoted-insert", NULL);
 387
 388         /*
 389          * Ctrl-left-arrow and Ctrl-right-arrow for word moving.
 390          */
 391         el_set(e, EL_BIND, "\\e[1;5C", "em-next-word", NULL);
 392         el_set(e, EL_BIND, "\\e[1;5D", "ed-prev-word", NULL);
 393         el_set(e, EL_BIND, "\\e[5C", "em-next-word", NULL);
 394         el_set(e, EL_BIND, "\\e[5D", "ed-prev-word", NULL);
 395         el_set(e, EL_BIND, "\\e\\e[C", "em-next-word", NULL);
 396         el_set(e, EL_BIND, "\\e\\e[D", "ed-prev-word", NULL);
 397
 398         /* read settings from configuration file */
 399         el_source(e, NULL);
 400
 401         /*
 402          * Unfortunately, some applications really do use rl_point
 403          * and rl_line_buffer directly.
 404          */
 405         _resize_fun(e, &rl_line_buffer);
 406         _rl_update_pos();
 407
 408         if (rl_startup_hook)
 409                 (*rl_startup_hook)(NULL, 0);
 410
 411         return 0;
 412 }
 413
 414
 415 /*
 416  * read one line from input stream and return it, chomping
 417  * trailing newline (if there is any)
 418  */
 419 char *
 420 readline(const char *p)
 421 {
 422         HistEvent ev;
 423         const char * volatile prompt = p;
 424         int count;
 425         const char *ret;
 426         char *buf;
 427         static int used_event_hook;
 428
 429         if (e == NULL || h == NULL)
 430                 rl_initialize();
 431
 432         rl_done = 0;
 433
 434         (void)setjmp(topbuf);
 435
 436         /* update prompt accordingly to what has been passed */
 437         if (rl_set_prompt(prompt) == -1)
 438                 return NULL;
 439
 440         if (rl_pre_input_hook)
 441                 (*rl_pre_input_hook)(NULL, 0);
 442
 443         if (rl_event_hook && !(e->el_flags&NO_TTY)) {
 444                 el_set(e, EL_GETCFN, _rl_event_read_char);
 445                 used_event_hook = 1;
 446         }
 447
 448         if (!rl_event_hook && used_event_hook) {
 449                 el_set(e, EL_GETCFN, EL_BUILTIN_GETCFN);
 450                 used_event_hook = 0;
 451         }
 452
 453         rl_already_prompted = 0;
 454
 455         /* get one line from input stream */
 456         ret = el_gets(e, &count);
 457
 458         if (ret && count > 0) {
 459                 int lastidx;
 460
 461                 buf = strdup(ret);
 462                 if (buf == NULL)
 463                         return NULL;
 464                 lastidx = count - 1;
 465                 if (buf[lastidx] == '\n')
 466                         buf[lastidx] = '\0';
 467         } else
 468                 buf = NULL;
 469
 470         history(h, &ev, H_GETSIZE);
 471         history_length = ev.num;
 472
 473         return buf;
 474 }
 475
 476 /*
 477  * history functions
 478  */
 479
 480 /*
 481  * is normally called before application starts to use
 482  * history expansion functions
 483  */
 484 void
 485 using_history(void)
 486 {
 487         if (h == NULL || e == NULL)
 488                 rl_initialize();
 489 }
 490
 491
 492 /*
 493  * substitute ``what'' with ``with'', returning resulting string; if
 494  * globally == 1, substitutes all occurrences of what, otherwise only the
 495  * first one
 496  */
 497 static char *
 498 _rl_compat_sub(const char *str, const char *what, const char *with,
 499     int globally)
 500 {
 501         const   char    *s;
 502         char    *r, *result;
 503         size_t  len, with_len, what_len;
 504
 505         len = strlen(str);
 506         with_len = strlen(with);
 507         what_len = strlen(what);
 508
 509         /* calculate length we need for result */
 510         s = str;
 511         while (*s) {
 512                 if (*s == *what && !strncmp(s, what, what_len)) {
 513                         len += with_len - what_len;
 514                         if (!globally)
 515                                 break;
 516                         s += what_len;
 517                 } else
 518                         s++;
 519         }
 520         r = result = el_malloc((len + 1) * sizeof(*r));
 521         if (result == NULL)
 522                 return NULL;
 523         s = str;
 524         while (*s) {
 525                 if (*s == *what && !strncmp(s, what, what_len)) {
 526                         (void)strncpy(r, with, with_len);
 527                         r += with_len;
 528                         s += what_len;
 529                         if (!globally) {
 530                                 (void)strcpy(r, s);
 531                                 return result;
 532                         }
 533                 } else
 534                         *r++ = *s++;
 535         }
 536         *r = '\0';
 537         return result;
 538 }
 539
 540 static  char    *last_search_pat;       /* last !?pat[?] search pattern */
 541 static  char    *last_search_match;     /* last !?pat[?] that matched */
 542
 543 const char *
 544 get_history_event(const char *cmd, int *cindex, int qchar)
 545 {
 546         int idx, sign, sub, num, begin, ret;
 547         size_t len;
 548         char    *pat;
 549         const char *rptr;
 550         HistEvent ev;
 551
 552         idx = *cindex;
 553         if (cmd[idx++] != history_expansion_char)
 554                 return NULL;
 555
 556         /* find out which event to take */
 557         if (cmd[idx] == history_expansion_char || cmd[idx] == '\0') {
 558                 if (history(h, &ev, H_FIRST) != 0)
 559                         return NULL;
 560                 *cindex = cmd[idx]? (idx + 1):idx;
 561                 return ev.str;
 562         }
 563         sign = 0;
 564         if (cmd[idx] == '-') {
 565                 sign = 1;
 566                 idx++;
 567         }
 568
 569         if ('0' <= cmd[idx] && cmd[idx] <= '9') {
 570                 HIST_ENTRY *rl_he;
 571
 572                 num = 0;
 573                 while (cmd[idx] && '0' <= cmd[idx] && cmd[idx] <= '9') {
 574                         num = num * 10 + cmd[idx] - '0';
 575                         idx++;
 576                 }
 577                 if (sign)
 578                         num = history_length - num + 1;
 579
 580                 if (!(rl_he = history_get(num)))
 581                         return NULL;
 582
 583                 *cindex = idx;
 584                 return rl_he->line;
 585         }
 586         sub = 0;
 587         if (cmd[idx] == '?') {
 588                 sub = 1;
 589                 idx++;
 590         }
 591         begin = idx;
 592         while (cmd[idx]) {
 593                 if (cmd[idx] == '\n')
 594                         break;
 595                 if (sub && cmd[idx] == '?')
 596                         break;
 597                 if (!sub && (cmd[idx] == ':' || cmd[idx] == ' '
 598                                     || cmd[idx] == '\t' || cmd[idx] == qchar))
 599                         break;
 600                 idx++;
 601         }
 602         len = (size_t)idx - (size_t)begin;
 603         if (sub && cmd[idx] == '?')
 604                 idx++;
 605         if (sub && len == 0 && last_search_pat && *last_search_pat)
 606                 pat = last_search_pat;
 607         else if (len == 0)
 608                 return NULL;
 609         else {
 610                 if ((pat = el_malloc((len + 1) * sizeof(*pat))) == NULL)
 611                         return NULL;
 612                 (void)strncpy(pat, cmd + begin, len);
 613                 pat[len] = '\0';
 614         }
 615
 616         if (history(h, &ev, H_CURR) != 0) {
 617                 if (pat != last_search_pat)
 618                         el_free(pat);
 619                 return NULL;
 620         }
 621         num = ev.num;
 622
 623         if (sub) {
 624                 if (pat != last_search_pat) {
 625                         if (last_search_pat)
 626                                 el_free(last_search_pat);
 627                         last_search_pat = pat;
 628                 }
 629                 ret = history_search(pat, -1);
 630         } else
 631                 ret = history_search_prefix(pat, -1);
 632
 633         if (ret == -1) {
 634                 /* restore to end of list on failed search */
 635                 history(h, &ev, H_FIRST);
 636                 (void)fprintf(rl_outstream, "%s: Event not found\n", pat);
 637                 if (pat != last_search_pat)
 638                         el_free(pat);
 639                 return NULL;
 640         }
 641
 642         if (sub && len) {
 643                 if (last_search_match && last_search_match != pat)
 644                         el_free(last_search_match);
 645                 last_search_match = pat;
 646         }
 647
 648         if (pat != last_search_pat)
 649                 el_free(pat);
 650
 651         if (history(h, &ev, H_CURR) != 0)
 652                 return NULL;
 653         *cindex = idx;
 654         rptr = ev.str;
 655
 656         /* roll back to original position */
 657         (void)history(h, &ev, H_SET, num);
 658
 659         return rptr;
 660 }
 661
 662 /*
 663  * the real function doing history expansion - takes as argument command
 664  * to do and data upon which the command should be executed
 665  * does expansion the way I've understood readline documentation
 666  *
 667  * returns 0 if data was not modified, 1 if it was and 2 if the string
 668  * should be only printed and not executed; in case of error,
 669  * returns -1 and *result points to NULL
 670  * it's the caller's responsibility to free() the string returned in *result
 671  */
 672 static int
 673 _history_expand_command(const char *command, size_t offs, size_t cmdlen,
 674     char **result)
 675 {
 676         char *tmp, *search = NULL, *aptr;
 677         const char *ptr, *cmd;
 678         static char *from = NULL, *to = NULL;
 679         int start, end, idx, has_mods = 0;
 680         int p_on = 0, g_on = 0;
 681
 682         *result = NULL;
 683         aptr = NULL;
 684         ptr = NULL;
 685
 686         /* First get event specifier */
 687         idx = 0;
 688
 689         if (strchr(":^*$", command[offs + 1])) {
 690                 char str[4];
 691                 /*
 692                 * "!:" is shorthand for "!!:".
 693                 * "!^", "!*" and "!$" are shorthand for
 694                 * "!!:^", "!!:*" and "!!:$" respectively.
 695                 */
 696                 str[0] = str[1] = '!';
 697                 str[2] = '0';
 698                 ptr = get_history_event(str, &idx, 0);
 699                 idx = (command[offs + 1] == ':')? 1:0;
 700                 has_mods = 1;
 701         } else {
 702                 if (command[offs + 1] == '#') {
 703                         /* use command so far */
 704                         if ((aptr = el_malloc((offs + 1) * sizeof(*aptr)))
 705                             == NULL)
 706                                 return -1;
 707                         (void)strncpy(aptr, command, offs);
 708                         aptr[offs] = '\0';
 709                         idx = 1;
 710                 } else {
 711                         int     qchar;
 712
 713                         qchar = (offs > 0 && command[offs - 1] == '"')? '"':0;
 714                         ptr = get_history_event(command + offs, &idx, qchar);
 715                 }
 716                 has_mods = command[offs + (size_t)idx] == ':';
 717         }
 718
 719         if (ptr == NULL && aptr == NULL)
 720                 return -1;
 721
 722         if (!has_mods) {
 723                 *result = strdup(aptr ? aptr : ptr);
 724                 if (aptr)
 725                         el_free(aptr);
 726                 if (*result == NULL)
 727                         return -1;
 728                 return 1;
 729         }
 730
 731         cmd = command + offs + idx + 1;
 732
 733         /* Now parse any word designators */
 734
 735         if (*cmd == '%')        /* last word matched by ?pat? */
 736                 tmp = strdup(last_search_match? last_search_match:"");
 737         else if (strchr("^*$-0123456789", *cmd)) {
 738                 start = end = -1;
 739                 if (*cmd == '^')
 740                         start = end = 1, cmd++;
 741                 else if (*cmd == '$')
 742                         start = -1, cmd++;
 743                 else if (*cmd == '*')
 744                         start = 1, cmd++;
 745                else if (*cmd == '-' || isdigit((unsigned char) *cmd)) {
 746                         start = 0;
 747                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 748                                 start = start * 10 + *cmd++ - '0';
 749
 750                         if (*cmd == '-') {
 751                                 if (isdigit((unsigned char) cmd[1])) {
 752                                         cmd++;
 753                                         end = 0;
 754                                         while (*cmd && '0' <= *cmd && *cmd <= '9')
 755                                                 end = end * 10 + *cmd++ - '0';
 756                                 } else if (cmd[1] == '$') {
 757                                         cmd += 2;
 758                                         end = -1;
 759                                 } else {
 760                                         cmd++;
 761                                         end = -2;
 762                                 }
 763                         } else if (*cmd == '*')
 764                                 end = -1, cmd++;
 765                         else
 766                                 end = start;
 767                 }
 768                 tmp = history_arg_extract(start, end, aptr? aptr:ptr);
 769                 if (tmp == NULL) {
 770                         (void)fprintf(rl_outstream, "%s: Bad word specifier",
 771                             command + offs + idx);
 772                         if (aptr)
 773                                 el_free(aptr);
 774                         return -1;
 775                 }
 776         } else
 777                 tmp = strdup(aptr? aptr:ptr);
 778
 779         if (aptr)
 780                 el_free(aptr);
 781
 782         if (*cmd == '\0' || ((size_t)(cmd - (command + offs)) >= cmdlen)) {
 783                 *result = tmp;
 784                 return 1;
 785         }
 786
 787         for (; *cmd; cmd++) {
 788                 if (*cmd == ':')
 789                         continue;
 790                 else if (*cmd == 'h') {         /* remove trailing path */
 791                         if ((aptr = strrchr(tmp, '/')) != NULL)
 792                                 *aptr = '\0';
 793                 } else if (*cmd == 't') {       /* remove leading path */
 794                         if ((aptr = strrchr(tmp, '/')) != NULL) {
 795                                 aptr = strdup(aptr + 1);
 796                                 el_free(tmp);
 797                                 tmp = aptr;
 798                         }
 799                 } else if (*cmd == 'r') {       /* remove trailing suffix */
 800                         if ((aptr = strrchr(tmp, '.')) != NULL)
 801                                 *aptr = '\0';
 802                 } else if (*cmd == 'e') {       /* remove all but suffix */
 803                         if ((aptr = strrchr(tmp, '.')) != NULL) {
 804                                 aptr = strdup(aptr);
 805                                 el_free(tmp);
 806                                 tmp = aptr;
 807                         }
 808                 } else if (*cmd == 'p')         /* print only */
 809                         p_on = 1;
 810                 else if (*cmd == 'g')
 811                         g_on = 2;
 812                 else if (*cmd == 's' || *cmd == '&') {
 813                         char *what, *with, delim;
 814                         size_t len, from_len;
 815                         size_t size;
 816
 817                         if (*cmd == '&' && (from == NULL || to == NULL))
 818                                 continue;
 819                         else if (*cmd == 's') {
 820                                 delim = *(++cmd), cmd++;
 821                                 size = 16;
 822                                 what = el_realloc(from, size * sizeof(*what));
 823                                 if (what == NULL) {
 824                                         el_free(from);
 825                                         el_free(tmp);
 826                                         return 0;
 827                                 }
 828                                 len = 0;
 829                                 for (; *cmd && *cmd != delim; cmd++) {
 830                                         if (*cmd == '\\' && cmd[1] == delim)
 831                                                 cmd++;
 832                                         if (len >= size) {
 833                                                 char *nwhat;
 834                                                 nwhat = el_realloc(what,
 835                                                     (size <<= 1) *
 836                                                     sizeof(*nwhat));
 837                                                 if (nwhat == NULL) {
 838                                                         el_free(what);
 839                                                         el_free(tmp);
 840                                                         return 0;
 841                                                 }
 842                                                 what = nwhat;
 843                                         }
 844                                         what[len++] = *cmd;
 845                                 }
 846                                 what[len] = '\0';
 847                                 from = what;
 848                                 if (*what == '\0') {
 849                                         el_free(what);
 850                                         if (search) {
 851                                                 from = strdup(search);
 852                                                 if (from == NULL) {
 853                                                         el_free(tmp);
 854                                                         return 0;
 855                                                 }
 856                                         } else {
 857                                                 from = NULL;
 858                                                 el_free(tmp);
 859                                                 return -1;
 860                                         }
 861                                 }
 862                                 cmd++;  /* shift after delim */
 863                                 if (!*cmd)
 864                                         continue;
 865
 866                                 size = 16;
 867                                 with = el_realloc(to, size * sizeof(*with));
 868                                 if (with == NULL) {
 869                                         el_free(to);
 870                                         el_free(tmp);
 871                                         return -1;
 872                                 }
 873                                 len = 0;
 874                                 from_len = strlen(from);
 875                                 for (; *cmd && *cmd != delim; cmd++) {
 876                                         if (len + from_len + 1 >= size) {
 877                                                 char *nwith;
 878                                                 size += from_len + 1;
 879                                                 nwith = el_realloc(with,
 880                                                     size * sizeof(*nwith));
 881                                                 if (nwith == NULL) {
 882                                                         el_free(with);
 883                                                         el_free(tmp);
 884                                                         return -1;
 885                                                 }
 886                                                 with = nwith;
 887                                         }
 888                                         if (*cmd == '&') {
 889                                                 /* safe */
 890                                                 (void)strcpy(&with[len], from);
 891                                                 len += from_len;
 892                                                 continue;
 893                                         }
 894                                         if (*cmd == '\\'
 895                                             && (*(cmd + 1) == delim
 896                                                 || *(cmd + 1) == '&'))
 897                                                 cmd++;
 898                                         with[len++] = *cmd;
 899                                 }
 900                                 with[len] = '\0';
 901                                 to = with;
 902                         }
 903
 904                         aptr = _rl_compat_sub(tmp, from, to, g_on);
 905                         if (aptr) {
 906                                 el_free(tmp);
 907                                 tmp = aptr;
 908                         }
 909                         g_on = 0;
 910                 }
 911         }
 912         *result = tmp;
 913         return p_on? 2:1;
 914 }
 915
 916
 917 /*
 918  * csh-style history expansion
 919  */
 920 int
 921 history_expand(char *str, char **output)
 922 {
 923         int ret = 0;
 924         size_t idx, i, size;
 925         char *tmp, *result;
 926
 927         if (h == NULL || e == NULL)
 928                 rl_initialize();
 929
 930         if (history_expansion_char == 0) {
 931                 *output = strdup(str);
 932                 return 0;
 933         }
 934
 935         *output = NULL;
 936         if (str[0] == history_subst_char) {
 937                 /* ^foo^foo2^ is equivalent to !!:s^foo^foo2^ */
 938                 *output = el_malloc((strlen(str) + 4 + 1) * sizeof(**output));
 939                 if (*output == NULL)
 940                         return 0;
 941                 (*output)[0] = (*output)[1] = history_expansion_char;
 942                 (*output)[2] = ':';
 943                 (*output)[3] = 's';
 944                 (void)strcpy((*output) + 4, str);
 945                 str = *output;
 946         } else {
 947                 *output = strdup(str);
 948                 if (*output == NULL)
 949                         return 0;
 950         }
 951
 952 #define ADD_STRING(what, len, fr)                                       \
 953         {                                                               \
 954                 if (idx + len + 1 > size) {                             \
 955                         char *nresult = el_realloc(result,              \
 956                             (size += len + 1) * sizeof(*nresult));      \
 957                         if (nresult == NULL) {                          \
 958                                 el_free(*output);                       \
 959                                 if (/*CONSTCOND*/fr)                    \
 960                                         el_free(tmp);                   \
 961                                 return 0;                               \
 962                         }                                               \
 963                         result = nresult;                               \
 964                 }                                                       \
 965                 (void)strncpy(&result[idx], what, len);                 \
 966                 idx += len;                                             \
 967                 result[idx] = '\0';                                     \
 968         }
 969
 970         result = NULL;
 971         size = idx = 0;
 972         tmp = NULL;
 973         for (i = 0; str[i];) {
 974                 int qchar, loop_again;
 975                 size_t len, start, j;
 976
 977                 qchar = 0;
 978                 loop_again = 1;
 979                 start = j = i;
 980 loop:
 981                 for (; str[j]; j++) {
 982                         if (str[j] == '\\' &&
 983                             str[j + 1] == history_expansion_char) {
 984                                 len = strlen(&str[j + 1]) + 1;
 985                                 memmove(&str[j], &str[j + 1], len);
 986                                 continue;
 987                         }
 988                         if (!loop_again) {
 989                                 if (isspace((unsigned char) str[j])
 990                                     || str[j] == qchar)
 991                                         break;
 992                         }
 993                         if (str[j] == history_expansion_char
 994                             && !strchr(history_no_expand_chars, str[j + 1])
 995                             && (!history_inhibit_expansion_function ||
 996                             (*history_inhibit_expansion_function)(str,
 997                             (int)j) == 0))
 998                                 break;
 999                 }
1000
1001                 if (str[j] && loop_again) {
1002                         i = j;
1003                         qchar = (j > 0 && str[j - 1] == '"' )? '"':0;
1004                         j++;
1005                         if (str[j] == history_expansion_char)
1006                                 j++;
1007                         loop_again = 0;
1008                         goto loop;
1009                 }
1010                 len = i - start;
1011                 ADD_STRING(&str[start], len, 0);
1012
1013                 if (str[i] == '\0' || str[i] != history_expansion_char) {
1014                         len = j - i;
1015                         ADD_STRING(&str[i], len, 0);
1016                         if (start == 0)
1017                                 ret = 0;
1018                         else
1019                                 ret = 1;
1020                         break;
1021                 }
1022                 ret = _history_expand_command (str, i, (j - i), &tmp);
1023                 if (ret > 0 && tmp) {
1024                         len = strlen(tmp);
1025                         ADD_STRING(tmp, len, 1);
1026                 }
1027                 if (tmp) {
1028                         el_free(tmp);
1029                         tmp = NULL;
1030                 }
1031                 i = j;
1032         }
1033
1034         /* ret is 2 for "print only" option */
1035         if (ret == 2) {
1036                 add_history(result);
1037 #ifdef GDB_411_HACK
1038                 /* gdb 4.11 has been shipped with readline, where */
1039                 /* history_expand() returned -1 when the line     */
1040                 /* should not be executed; in readline 2.1+       */
1041                 /* it should return 2 in such a case              */
1042                 ret = -1;
1043 #endif
1044         }
1045         el_free(*output);
1046         *output = result;
1047
1048         return ret;
1049 }
1050
1051 /*
1052 * Return a string consisting of arguments of "str" from "start" to "end".
1053 */
1054 char *
1055 history_arg_extract(int start, int end, const char *str)
1056 {
1057         size_t  i, len, max;
1058         char    **arr, *result = NULL;
1059
1060         arr = history_tokenize(str);
1061         if (!arr)
1062                 return NULL;
1063         if (arr && *arr == NULL)
1064                 goto out;
1065
1066         for (max = 0; arr[max]; max++)
1067                 continue;
1068         max--;
1069
1070         if (start == '$')
1071                 start = (int)max;
1072         if (end == '$')
1073                 end = (int)max;
1074         if (end < 0)
1075                 end = (int)max + end + 1;
1076         if (start < 0)
1077                 start = end;
1078
1079         if (start < 0 || end < 0 || (size_t)start > max ||
1080             (size_t)end > max || start > end)
1081                 goto out;
1082
1083         for (i = (size_t)start, len = 0; i <= (size_t)end; i++)
1084                 len += strlen(arr[i]) + 1;
1085         len++;
1086         result = el_malloc(len * sizeof(*result));
1087         if (result == NULL)
1088                 goto out;
1089
1090         for (i = (size_t)start, len = 0; i <= (size_t)end; i++) {
1091                 (void)strcpy(result + len, arr[i]);
1092                 len += strlen(arr[i]);
1093                 if (i < (size_t)end)
1094                         result[len++] = ' ';
1095         }
1096         result[len] = '\0';
1097
1098 out:
1099         for (i = 0; arr[i]; i++)
1100                 el_free(arr[i]);
1101         el_free(arr);
1102
1103         return result;
1104 }
1105
1106 /*
1107  * Parse the string into individual tokens,
1108  * similar to how shell would do it.
1109  */
1110 char **
1111 history_tokenize(const char *str)
1112 {
1113         int size = 1, idx = 0, i, start;
1114         size_t len;
1115         char **result = NULL, *temp, delim = '\0';
1116
1117         for (i = 0; str[i];) {
1118                 while (isspace((unsigned char) str[i]))
1119                         i++;
1120                 start = i;
1121                 for (; str[i];) {
1122                         if (str[i] == '\\') {
1123                                 if (str[i+1] != '\0')
1124                                         i++;
1125                         } else if (str[i] == delim)
1126                                 delim = '\0';
1127                         else if (!delim &&
1128                                     (isspace((unsigned char) str[i]) ||
1129                                 strchr("()<>;&|$", str[i])))
1130                                 break;
1131                         else if (!delim && strchr("'`\"", str[i]))
1132                                 delim = str[i];
1133                         if (str[i])
1134                                 i++;
1135                 }
1136
1137                 if (idx + 2 >= size) {
1138                         char **nresult;
1139                         size <<= 1;
1140                         nresult = el_realloc(result, (size_t)size * sizeof(*nresult));
1141                         if (nresult == NULL) {
1142                                 el_free(result);
1143                                 return NULL;
1144                         }
1145                         result = nresult;
1146                 }
1147                 len = (size_t)i - (size_t)start;
1148                 temp = el_malloc((size_t)(len + 1) * sizeof(*temp));
1149                 if (temp == NULL) {
1150                         for (i = 0; i < idx; i++)
1151                                 el_free(result[i]);
1152                         el_free(result);
1153                         return NULL;
1154                 }
1155                 (void)strncpy(temp, &str[start], len);
1156                 temp[len] = '\0';
1157                 result[idx++] = temp;
1158                 result[idx] = NULL;
1159                 if (str[i])
1160                         i++;
1161         }
1162         return result;
1163 }
1164
1165
1166 /*
1167  * limit size of history record to ``max'' events
1168  */
1169 void
1170 stifle_history(int max)
1171 {
1172         HistEvent ev;
1173
1174         if (h == NULL || e == NULL)
1175                 rl_initialize();
1176
1177         if (history(h, &ev, H_SETSIZE, max) == 0)
1178                 max_input_history = max;
1179 }
1180
1181
1182 /*
1183  * "unlimit" size of history - set the limit to maximum allowed int value
1184  */
1185 int
1186 unstifle_history(void)
1187 {
1188         HistEvent ev;
1189         int omax;
1190
1191         history(h, &ev, H_SETSIZE, INT_MAX);
1192         omax = max_input_history;
1193         max_input_history = INT_MAX;
1194         return omax;            /* some value _must_ be returned */
1195 }
1196
1197
1198 int
1199 history_is_stifled(void)
1200 {
1201
1202         /* cannot return true answer */
1203         return max_input_history != INT_MAX;
1204 }
1205
1206 static const char _history_tmp_template[] = "/tmp/.historyXXXXXX";
1207
1208 int
1209 history_truncate_file (const char *filename, int nlines)
1210 {
1211         int ret = 0;
1212         FILE *fp, *tp;
1213         char template[sizeof(_history_tmp_template)];
1214         char buf[4096];
1215         int fd;
1216         char *cp;
1217         off_t off;
1218         int count = 0;
1219         ssize_t left = 0;
1220
1221         if (filename == NULL && (filename = _default_history_file()) == NULL)
1222                 return errno;
1223         if ((fp = fopen(filename, "r+")) == NULL)
1224                 return errno;
1225         strcpy(template, _history_tmp_template);
1226         if ((fd = mkstemp(template)) == -1) {
1227                 ret = errno;
1228                 goto out1;
1229         }
1230
1231         if ((tp = fdopen(fd, "r+")) == NULL) {
1232                 close(fd);
1233                 ret = errno;
1234                 goto out2;
1235         }
1236
1237         for(;;) {
1238                 if (fread(buf, sizeof(buf), (size_t)1, fp) != 1) {
1239                         if (ferror(fp)) {
1240                                 ret = errno;
1241                                 break;
1242                         }
1243                         if (fseeko(fp, (off_t)sizeof(buf) * count, SEEK_SET) ==
1244                             (off_t)-1) {
1245                                 ret = errno;
1246                                 break;
1247                         }
1248                         left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), fp);
1249                         if (ferror(fp)) {
1250                                 ret = errno;
1251                                 break;
1252                         }
1253                         if (left == 0) {
1254                                 count--;
1255                                 left = sizeof(buf);
1256                         } else if (fwrite(buf, (size_t)left, (size_t)1, tp)
1257                             != 1) {
1258                                 ret = errno;
1259                                 break;
1260                         }
1261                         fflush(tp);
1262                         break;
1263                 }
1264                 if (fwrite(buf, sizeof(buf), (size_t)1, tp) != 1) {
1265                         ret = errno;
1266                         break;
1267                 }
1268                 count++;
1269         }
1270         if (ret)
1271                 goto out3;
1272         cp = buf + left - 1;
1273         if(*cp != '\n')
1274                 cp++;
1275         for(;;) {
1276                 while (--cp >= buf) {
1277                         if (*cp == '\n') {
1278                                 if (--nlines == 0) {
1279                                         if (++cp >= buf + sizeof(buf)) {
1280                                                 count++;
1281                                                 cp = buf;
1282                                         }
1283                                         break;
1284                                 }
1285                         }
1286                 }
1287                 if (nlines <= 0 || count == 0)
1288                         break;
1289                 count--;
1290                 if (fseeko(tp, (off_t)sizeof(buf) * count, SEEK_SET) < 0) {
1291                         ret = errno;
1292                         break;
1293                 }
1294                 if (fread(buf, sizeof(buf), (size_t)1, tp) != 1) {
1295                         if (ferror(tp)) {
1296                                 ret = errno;
1297                                 break;
1298                         }
1299                         ret = EAGAIN;
1300                         break;
1301                 }
1302                 cp = buf + sizeof(buf);
1303         }
1304
1305         if (ret || nlines > 0)
1306                 goto out3;
1307
1308         if (fseeko(fp, (off_t)0, SEEK_SET) == (off_t)-1) {
1309                 ret = errno;
1310                 goto out3;
1311         }
1312
1313         if (fseeko(tp, (off_t)sizeof(buf) * count + (cp - buf), SEEK_SET) ==
1314             (off_t)-1) {
1315                 ret = errno;
1316                 goto out3;
1317         }
1318
1319         for(;;) {
1320                 if ((left = (ssize_t)fread(buf, (size_t)1, sizeof(buf), tp)) == 0) {
1321                         if (ferror(fp))
1322                                 ret = errno;
1323                         break;
1324                 }
1325                 if (fwrite(buf, (size_t)left, (size_t)1, fp) != 1) {
1326                         ret = errno;
1327                         break;
1328                 }
1329         }
1330         fflush(fp);
1331         if((off = ftello(fp)) > 0)
1332                 (void)ftruncate(fileno(fp), off);
1333 out3:
1334         fclose(tp);
1335 out2:
1336         unlink(template);
1337 out1:
1338         fclose(fp);
1339
1340         return ret;
1341 }
1342
1343
1344 /*
1345  * read history from a file given
1346  */
1347 int
1348 read_history(const char *filename)
1349 {
1350         HistEvent ev;
1351
1352         if (h == NULL || e == NULL)
1353                 rl_initialize();
1354         if (filename == NULL && (filename = _default_history_file()) == NULL)
1355                 return errno;
1356         return history(h, &ev, H_LOAD, filename) == -1 ?
1357             (errno ? errno : EINVAL) : 0;
1358 }
1359
1360
1361 /*
1362  * write history to a file given
1363  */
1364 int
1365 write_history(const char *filename)
1366 {
1367         HistEvent ev;
1368
1369         if (h == NULL || e == NULL)
1370                 rl_initialize();
1371         if (filename == NULL && (filename = _default_history_file()) == NULL)
1372                 return errno;
1373         return history(h, &ev, H_SAVE, filename) == -1 ?
1374             (errno ? errno : EINVAL) : 0;
1375 }
1376
1377
1378 /*
1379  * returns history ``num''th event
1380  *
1381  * returned pointer points to static variable
1382  */
1383 HIST_ENTRY *
1384 history_get(int num)
1385 {
1386         static HIST_ENTRY she;
1387         HistEvent ev;
1388         int curr_num;
1389
1390         if (h == NULL || e == NULL)
1391                 rl_initialize();
1392
1393         /* save current position */
1394         if (history(h, &ev, H_CURR) != 0)
1395                 return NULL;
1396         curr_num = ev.num;
1397
1398         /* start from the oldest */
1399         if (history(h, &ev, H_LAST) != 0)
1400                 return NULL;    /* error */
1401
1402         /* look forwards for event matching specified offset */
1403         if (history(h, &ev, H_NEXT_EVDATA, num, &she.data))
1404                 return NULL;
1405
1406         she.line = ev.str;
1407
1408         /* restore pointer to where it was */
1409         (void)history(h, &ev, H_SET, curr_num);
1410
1411         return &she;
1412 }
1413
1414
1415 /*
1416  * add the line to history table
1417  */
1418 int
1419 add_history(const char *line)
1420 {
1421         HistEvent ev;
1422
1423         if (line == NULL)
1424                 return 0;
1425
1426         if (h == NULL || e == NULL)
1427                 rl_initialize();
1428
1429         (void)history(h, &ev, H_ENTER, line);
1430         if (history(h, &ev, H_GETSIZE) == 0)
1431                 history_length = ev.num;
1432
1433         return !(history_length > 0); /* return 0 if all is okay */
1434 }
1435
1436
1437 /*
1438  * remove the specified entry from the history list and return it.
1439  */
1440 HIST_ENTRY *
1441 remove_history(int num)
1442 {
1443         HIST_ENTRY *he;
1444         HistEvent ev;
1445
1446         if (h == NULL || e == NULL)
1447                 rl_initialize();
1448
1449         if ((he = el_malloc(sizeof(*he))) == NULL)
1450                 return NULL;
1451
1452         if (history(h, &ev, H_DELDATA, num, &he->data) != 0) {
1453                 el_free(he);
1454                 return NULL;
1455         }
1456
1457         he->line = ev.str;
1458         if (history(h, &ev, H_GETSIZE) == 0)
1459                 history_length = ev.num;
1460
1461         return he;
1462 }
1463
1464
1465 /*
1466  * replace the line and data of the num-th entry
1467  */
1468 HIST_ENTRY *
1469 replace_history_entry(int num, const char *line, histdata_t data)
1470 {
1471         HIST_ENTRY *he;
1472         HistEvent ev;
1473         int curr_num;
1474
1475         if (h == NULL || e == NULL)
1476                 rl_initialize();
1477
1478         /* save current position */
1479         if (history(h, &ev, H_CURR) != 0)
1480                 return NULL;
1481         curr_num = ev.num;
1482
1483         /* start from the oldest */
1484         if (history(h, &ev, H_LAST) != 0)
1485                 return NULL;    /* error */
1486
1487         if ((he = el_malloc(sizeof(*he))) == NULL)
1488                 return NULL;
1489
1490         /* look forwards for event matching specified offset */
1491         if (history(h, &ev, H_NEXT_EVDATA, num, &he->data))
1492                 goto out;
1493
1494         he->line = strdup(ev.str);
1495         if (he->line == NULL)
1496                 goto out;
1497
1498         if (history(h, &ev, H_REPLACE, line, data))
1499                 goto out;
1500
1501         /* restore pointer to where it was */
1502         if (history(h, &ev, H_SET, curr_num))
1503                 goto out;
1504
1505         return he;
1506 out:
1507         el_free(he);
1508         return NULL;
1509 }
1510
1511 /*
1512  * clear the history list - delete all entries
1513  */
1514 void
1515 clear_history(void)
1516 {
1517         HistEvent ev;
1518
1519         if (h == NULL || e == NULL)
1520                 rl_initialize();
1521
1522         (void)history(h, &ev, H_CLEAR);
1523         history_length = 0;
1524 }
1525
1526
1527 /*
1528  * returns offset of the current history event
1529  */
1530 int
1531 where_history(void)
1532 {
1533         HistEvent ev;
1534         int curr_num, off;
1535
1536         if (history(h, &ev, H_CURR) != 0)
1537                 return 0;
1538         curr_num = ev.num;
1539
1540         (void)history(h, &ev, H_FIRST);
1541         off = 1;
1542         while (ev.num != curr_num && history(h, &ev, H_NEXT) == 0)
1543                 off++;
1544
1545         return off;
1546 }
1547
1548
1549 /*
1550  * returns current history event or NULL if there is no such event
1551  */
1552 HIST_ENTRY *
1553 current_history(void)
1554 {
1555
1556         return _move_history(H_CURR);
1557 }
1558
1559
1560 /*
1561  * returns total number of bytes history events' data are using
1562  */
1563 int
1564 history_total_bytes(void)
1565 {
1566         HistEvent ev;
1567         int curr_num;
1568         size_t size;
1569
1570         if (history(h, &ev, H_CURR) != 0)
1571                 return -1;
1572         curr_num = ev.num;
1573
1574         (void)history(h, &ev, H_FIRST);
1575         size = 0;
1576         do
1577                 size += strlen(ev.str) * sizeof(*ev.str);
1578         while (history(h, &ev, H_NEXT) == 0);
1579
1580         /* get to the same position as before */
1581         history(h, &ev, H_PREV_EVENT, curr_num);
1582
1583         return (int)size;
1584 }
1585
1586
1587 /*
1588  * sets the position in the history list to ``pos''
1589  */
1590 int
1591 history_set_pos(int pos)
1592 {
1593         HistEvent ev;
1594         int curr_num;
1595
1596         if (pos >= history_length || pos < 0)
1597                 return -1;
1598
1599         (void)history(h, &ev, H_CURR);
1600         curr_num = ev.num;
1601
1602         /*
1603          * use H_DELDATA to set to nth history (without delete) by passing
1604          * (void **)-1
1605          */
1606         if (history(h, &ev, H_DELDATA, pos, (void **)-1)) {
1607                 (void)history(h, &ev, H_SET, curr_num);
1608                 return -1;
1609         }
1610         return 0;
1611 }
1612
1613
1614 /*
1615  * returns previous event in history and shifts pointer accordingly
1616  */
1617 HIST_ENTRY *
1618 previous_history(void)
1619 {
1620
1621         return _move_history(H_PREV);
1622 }
1623
1624
1625 /*
1626  * returns next event in history and shifts pointer accordingly
1627  */
1628 HIST_ENTRY *
1629 next_history(void)
1630 {
1631
1632         return _move_history(H_NEXT);
1633 }
1634
1635
1636 /*
1637  * searches for first history event containing the str
1638  */
1639 int
1640 history_search(const char *str, int direction)
1641 {
1642         HistEvent ev;
1643         const char *strp;
1644         int curr_num;
1645
1646         if (history(h, &ev, H_CURR) != 0)
1647                 return -1;
1648         curr_num = ev.num;
1649
1650         for (;;) {
1651                 if ((strp = strstr(ev.str, str)) != NULL)
1652                         return (int)(strp - ev.str);
1653                 if (history(h, &ev, direction < 0 ? H_NEXT:H_PREV) != 0)
1654                         break;
1655         }
1656         (void)history(h, &ev, H_SET, curr_num);
1657         return -1;
1658 }
1659
1660
1661 /*
1662  * searches for first history event beginning with str
1663  */
1664 int
1665 history_search_prefix(const char *str, int direction)
1666 {
1667         HistEvent ev;
1668
1669         return (history(h, &ev, direction < 0 ?
1670             H_PREV_STR : H_NEXT_STR, str));
1671 }
1672
1673
1674 /*
1675  * search for event in history containing str, starting at offset
1676  * abs(pos); continue backward, if pos<0, forward otherwise
1677  */
1678 /* ARGSUSED */
1679 int
1680 history_search_pos(const char *str,
1681                    int direction __attribute__((__unused__)), int pos)
1682 {
1683         HistEvent ev;
1684         int curr_num, off;
1685
1686         off = (pos > 0) ? pos : -pos;
1687         pos = (pos > 0) ? 1 : -1;
1688
1689         if (history(h, &ev, H_CURR) != 0)
1690                 return -1;
1691         curr_num = ev.num;
1692
1693         if (history_set_pos(off) != 0 || history(h, &ev, H_CURR) != 0)
1694                 return -1;
1695
1696         for (;;) {
1697                 if (strstr(ev.str, str))
1698                         return off;
1699                 if (history(h, &ev, (pos < 0) ? H_PREV : H_NEXT) != 0)
1700                         break;
1701         }
1702
1703         /* set "current" pointer back to previous state */
1704         (void)history(h, &ev,
1705             pos < 0 ? H_NEXT_EVENT : H_PREV_EVENT, curr_num);
1706
1707         return -1;
1708 }
1709
1710
1711 /********************************/
1712 /* completion functions */
1713
1714 char *
1715 tilde_expand(char *name)
1716 {
1717         return fn_tilde_expand(name);
1718 }
1719
1720 char *
1721 filename_completion_function(const char *name, int state)
1722 {
1723         return fn_filename_completion_function(name, state);
1724 }
1725
1726 /*
1727  * a completion generator for usernames; returns _first_ username
1728  * which starts with supplied text
1729  * text contains a partial username preceded by random character
1730  * (usually '~'); state resets search from start (??? should we do that anyway)
1731  * it's the caller's responsibility to free the returned value
1732  */
1733 char *
1734 username_completion_function(const char *text, int state)
1735 {
1736 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1737         struct passwd pwres;
1738         char pwbuf[1024];
1739 #endif
1740         struct passwd *pass = NULL;
1741
1742         if (text[0] == '\0')
1743                 return NULL;
1744
1745         if (*text == '~')
1746                 text++;
1747
1748         if (state == 0)
1749                 setpwent();
1750
1751         while (
1752 #if defined(HAVE_GETPW_R_POSIX) || defined(HAVE_GETPW_R_DRAFT)
1753             getpwent_r(&pwres, pwbuf, sizeof(pwbuf), &pass) == 0 && pass != NULL
1754 #else
1755             (pass = getpwent()) != NULL
1756 #endif
1757             && text[0] == pass->pw_name[0]
1758             && strcmp(text, pass->pw_name) == 0)
1759                 continue;
1760
1761         if (pass == NULL) {
1762                 endpwent();
1763                 return NULL;
1764         }
1765         return strdup(pass->pw_name);
1766 }
1767
1768
1769 /*
1770  * el-compatible wrapper to send TSTP on ^Z
1771  */
1772 /* ARGSUSED */
1773 static unsigned char
1774 _el_rl_tstp(EditLine *el __attribute__((__unused__)), int ch __attribute__((__unused__)))
1775 {
1776         (void)kill(0, SIGTSTP);
1777         return CC_NORM;
1778 }
1779
1780 /*
1781  * Display list of strings in columnar format on readline's output stream.
1782  * 'matches' is list of strings, 'len' is number of strings in 'matches',
1783  * 'max' is maximum length of string in 'matches'.
1784  */
1785 void
1786 rl_display_match_list(char **matches, int len, int max)
1787 {
1788
1789         fn_display_match_list(e, matches, (size_t)len, (size_t)max);
1790 }
1791
1792 static const char *
1793 /*ARGSUSED*/
1794 _rl_completion_append_character_function(const char *dummy
1795     __attribute__((__unused__)))
1796 {
1797         static char buf[2];
1798         buf[0] = (char)rl_completion_append_character;
1799         buf[1] = '\0';
1800         return buf;
1801 }
1802
1803
1804 /*
1805  * complete word at current point
1806  */
1807 /* ARGSUSED */
1808 int
1809 rl_complete(int ignore __attribute__((__unused__)), int invoking_key)
1810 {
1811 #ifdef WIDECHAR
1812         static ct_buffer_t wbreak_conv, sprefix_conv;
1813 #endif
1814         char *breakchars;
1815
1816         if (h == NULL || e == NULL)
1817                 rl_initialize();
1818
1819         if (rl_inhibit_completion) {
1820                 char arr[2];
1821                 arr[0] = (char)invoking_key;
1822                 arr[1] = '\0';
1823                 el_insertstr(e, arr);
1824                 return CC_REFRESH;
1825         }
1826
1827         if (rl_completion_word_break_hook != NULL)
1828                 breakchars = (*rl_completion_word_break_hook)();
1829         else
1830                 breakchars = rl_basic_word_break_characters;
1831
1832         _rl_update_pos();
1833
1834         /* Just look at how many global variables modify this operation! */
1835         return fn_complete(e,
1836             (rl_compentry_func_t *)rl_completion_entry_function,
1837             rl_attempted_completion_function,
1838             ct_decode_string(rl_basic_word_break_characters, &wbreak_conv),
1839             ct_decode_string(breakchars, &sprefix_conv),
1840             _rl_completion_append_character_function,
1841             (size_t)rl_completion_query_items,
1842             &rl_completion_type, &rl_attempted_completion_over,
1843             &rl_point, &rl_end, NULL, NULL, NULL);
1844
1845
1846 }
1847
1848
1849 /* ARGSUSED */
1850 static unsigned char
1851 _el_rl_complete(EditLine *el __attribute__((__unused__)), int ch)
1852 {
1853         return (unsigned char)rl_complete(0, ch);
1854 }
1855
1856 /*
1857  * misc other functions
1858  */
1859
1860 /*
1861  * bind key c to readline-type function func
1862  */
1863 int
1864 rl_bind_key(int c, rl_command_func_t *func)
1865 {
1866         int retval = -1;
1867
1868         if (h == NULL || e == NULL)
1869                 rl_initialize();
1870
1871         if (func == rl_insert) {
1872                 /* XXX notice there is no range checking of ``c'' */
1873                 e->el_map.key[c] = ED_INSERT;
1874                 retval = 0;
1875         }
1876         return retval;
1877 }
1878
1879
1880 /*
1881  * read one key from input - handles chars pushed back
1882  * to input stream also
1883  */
1884 int
1885 rl_read_key(void)
1886 {
1887         char fooarr[2 * sizeof(int)];
1888
1889         if (e == NULL || h == NULL)
1890                 rl_initialize();
1891
1892         return el_getc(e, fooarr);
1893 }
1894
1895
1896 /*
1897  * reset the terminal
1898  */
1899 /* ARGSUSED */
1900 void
1901 rl_reset_terminal(const char *p __attribute__((__unused__)))
1902 {
1903
1904         if (h == NULL || e == NULL)
1905                 rl_initialize();
1906         el_reset(e);
1907 }
1908
1909
1910 /*
1911  * insert character ``c'' back into input stream, ``count'' times
1912  */
1913 int
1914 rl_insert(int count, int c)
1915 {
1916         char arr[2];
1917
1918         if (h == NULL || e == NULL)
1919                 rl_initialize();
1920
1921         /* XXX - int -> char conversion can lose on multichars */
1922         arr[0] = (char)c;
1923         arr[1] = '\0';
1924
1925         for (; count > 0; count--)
1926                 el_push(e, arr);
1927
1928         return 0;
1929 }
1930
1931 int
1932 rl_insert_text(const char *text)
1933 {
1934         if (!text || *text == 0)
1935                 return 0;
1936
1937         if (h == NULL || e == NULL)
1938                 rl_initialize();
1939
1940         if (el_insertstr(e, text) < 0)
1941                 return 0;
1942         return (int)strlen(text);
1943 }
1944
1945 /*ARGSUSED*/
1946 int
1947 rl_newline(int count __attribute__((__unused__)),
1948     int c __attribute__((__unused__)))
1949 {
1950         /*
1951          * Readline-4.0 appears to ignore the args.
1952          */
1953         return rl_insert(1, '\n');
1954 }
1955
1956 /*ARGSUSED*/
1957 static unsigned char
1958 rl_bind_wrapper(EditLine *el __attribute__((__unused__)), unsigned char c)
1959 {
1960         if (map[c] == NULL)
1961             return CC_ERROR;
1962
1963         _rl_update_pos();
1964
1965         (*map[c])(1, c);
1966
1967         /* If rl_done was set by the above call, deal with it here */
1968         if (rl_done)
1969                 return CC_EOF;
1970
1971         return CC_NORM;
1972 }
1973
1974 int
1975 rl_add_defun(const char *name, rl_command_func_t *fun, int c)
1976 {
1977         char dest[8];
1978         if ((size_t)c >= sizeof(map) / sizeof(map[0]) || c < 0)
1979                 return -1;
1980         map[(unsigned char)c] = fun;
1981         el_set(e, EL_ADDFN, name, name, rl_bind_wrapper);
1982         vis(dest, c, VIS_WHITE|VIS_NOSLASH, 0);
1983         el_set(e, EL_BIND, dest, name, NULL);
1984         return 0;
1985 }
1986
1987 void
1988 rl_callback_read_char(void)
1989 {
1990         int count = 0, done = 0;
1991         const char *buf = el_gets(e, &count);
1992         char *wbuf;
1993
1994         if (buf == NULL || count-- <= 0)
1995                 return;
1996         if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
1997                 done = 1;
1998         if (buf[count] == '\n' || buf[count] == '\r')
1999                 done = 2;
2000
2001         if (done && rl_linefunc != NULL) {
2002                 el_set(e, EL_UNBUFFERED, 0);
2003                 if (done == 2) {
2004                     if ((wbuf = strdup(buf)) != NULL)
2005                         wbuf[count] = '\0';
2006                 } else
2007                         wbuf = NULL;
2008                 (*(void (*)(const char *))rl_linefunc)(wbuf);
2009                 el_set(e, EL_UNBUFFERED, 1);
2010         }
2011 }
2012
2013 void
2014 rl_callback_handler_install(const char *prompt, rl_vcpfunc_t *linefunc)
2015 {
2016         if (e == NULL) {
2017                 rl_initialize();
2018         }
2019         (void)rl_set_prompt(prompt);
2020         rl_linefunc = linefunc;
2021         el_set(e, EL_UNBUFFERED, 1);
2022 }
2023
2024 void
2025 rl_callback_handler_remove(void)
2026 {
2027         el_set(e, EL_UNBUFFERED, 0);
2028         rl_linefunc = NULL;
2029 }
2030
2031 void
2032 rl_redisplay(void)
2033 {
2034         char a[2];
2035         a[0] = (char)e->el_tty.t_c[TS_IO][C_REPRINT];
2036         a[1] = '\0';
2037         el_push(e, a);
2038 }
2039
2040 int
2041 rl_get_previous_history(int count, int key)
2042 {
2043         char a[2];
2044         a[0] = (char)key;
2045         a[1] = '\0';
2046         while (count--)
2047                 el_push(e, a);
2048         return 0;
2049 }
2050
2051 void
2052 /*ARGSUSED*/
2053 rl_prep_terminal(int meta_flag __attribute__((__unused__)))
2054 {
2055         el_set(e, EL_PREP_TERM, 1);
2056 }
2057
2058 void
2059 rl_deprep_terminal(void)
2060 {
2061         el_set(e, EL_PREP_TERM, 0);
2062 }
2063
2064 int
2065 rl_read_init_file(const char *s)
2066 {
2067         return el_source(e, s);
2068 }
2069
2070 int
2071 rl_parse_and_bind(const char *line)
2072 {
2073         const char **argv;
2074         int argc;
2075         Tokenizer *tok;
2076
2077         tok = tok_init(NULL);
2078         tok_str(tok, line, &argc, &argv);
2079         argc = el_parse(e, argc, argv);
2080         tok_end(tok);
2081         return argc ? 1 : 0;
2082 }
2083
2084 int
2085 rl_variable_bind(const char *var, const char *value)
2086 {
2087         /*
2088          * The proper return value is undocument, but this is what the
2089          * readline source seems to do.
2090          */
2091         return el_set(e, EL_BIND, "", var, value, NULL) == -1 ? 1 : 0;
2092 }
2093
2094 void
2095 rl_stuff_char(int c)
2096 {
2097         char buf[2];
2098
2099         buf[0] = (char)c;
2100         buf[1] = '\0';
2101         el_insertstr(e, buf);
2102 }
2103
2104 static int
2105 _rl_event_read_char(EditLine *el, char *cp)
2106 {
2107         int     n;
2108         ssize_t num_read = 0;
2109
2110         *cp = '\0';
2111         while (rl_event_hook) {
2112
2113                 (*rl_event_hook)();
2114
2115 #if defined(FIONREAD)
2116                 if (ioctl(el->el_infd, FIONREAD, &n) < 0)
2117                         return -1;
2118                 if (n)
2119                         num_read = read(el->el_infd, cp, (size_t)1);
2120                 else
2121                         num_read = 0;
2122 #elif defined(F_SETFL) && defined(O_NDELAY)
2123                 if ((n = fcntl(el->el_infd, F_GETFL, 0)) < 0)
2124                         return -1;
2125                 if (fcntl(el->el_infd, F_SETFL, n|O_NDELAY) < 0)
2126                         return -1;
2127                 num_read = read(el->el_infd, cp, 1);
2128                 if (fcntl(el->el_infd, F_SETFL, n))
2129                         return -1;
2130 #else
2131                 /* not non-blocking, but what you gonna do? */
2132                 num_read = read(el->el_infd, cp, 1);
2133                 return -1;
2134 #endif
2135
2136                 if (num_read < 0 && errno == EAGAIN)
2137                         continue;
2138                 if (num_read == 0)
2139                         continue;
2140                 break;
2141         }
2142         if (!rl_event_hook)
2143                 el_set(el, EL_GETCFN, EL_BUILTIN_GETCFN);
2144         return (int)num_read;
2145 }
2146
2147 static void
2148 _rl_update_pos(void)
2149 {
2150         const LineInfo *li = el_line(e);
2151
2152         rl_point = (int)(li->cursor - li->buffer);
2153         rl_end = (int)(li->lastchar - li->buffer);
2154 }
2155
2156 void
2157 rl_get_screen_size(int *rows, int *cols)
2158 {
2159         if (rows)
2160                 el_get(e, EL_GETTC, "li", rows, (void *)0);
2161         if (cols)
2162                 el_get(e, EL_GETTC, "co", cols, (void *)0);
2163 }
2164
2165 void
2166 rl_set_screen_size(int rows, int cols)
2167 {
2168         char buf[64];
2169         (void)snprintf(buf, sizeof(buf), "%d", rows);
2170         el_set(e, EL_SETTC, "li", buf, NULL);
2171         (void)snprintf(buf, sizeof(buf), "%d", cols);
2172         el_set(e, EL_SETTC, "co", buf, NULL);
2173 }
2174
2175 char **
2176 rl_completion_matches(const char *str, rl_compentry_func_t *fun)
2177 {
2178         size_t len, max, i, j, min;
2179         char **list, *match, *a, *b;
2180
2181         len = 1;
2182         max = 10;
2183         if ((list = el_malloc(max * sizeof(*list))) == NULL)
2184                 return NULL;
2185
2186         while ((match = (*fun)(str, (int)(len - 1))) != NULL) {
2187                 list[len++] = match;
2188                 if (len == max) {
2189                         char **nl;
2190                         max += 10;
2191                         if ((nl = el_realloc(list, max * sizeof(*nl))) == NULL)
2192                                 goto out;
2193                         list = nl;
2194                 }
2195         }
2196         if (len == 1)
2197                 goto out;
2198         list[len] = NULL;
2199         if (len == 2) {
2200                 if ((list[0] = strdup(list[1])) == NULL)
2201                         goto out;
2202                 return list;
2203         }
2204         qsort(&list[1], len - 1, sizeof(*list),
2205             (int (*)(const void *, const void *)) strcmp);
2206         min = SIZE_T_MAX;
2207         for (i = 1, a = list[i]; i < len - 1; i++, a = b) {
2208                 b = list[i + 1];
2209                 for (j = 0; a[j] && a[j] == b[j]; j++)
2210                         continue;
2211                 if (min > j)
2212                         min = j;
2213         }
2214         if (min == 0 && *str) {
2215                 if ((list[0] = strdup(str)) == NULL)
2216                         goto out;
2217         } else {
2218                 if ((list[0] = el_malloc((min + 1) * sizeof(*list[0]))) == NULL)
2219                         goto out;
2220                 (void)memcpy(list[0], list[1], min);
2221                 list[0][min] = '\0';
2222         }
2223         return list;
2224
2225 out:
2226         el_free(list);
2227         return NULL;
2228 }
2229
2230 char *
2231 rl_filename_completion_function (const char *text, int state)
2232 {
2233         return fn_filename_completion_function(text, state);
2234 }
2235
2236 void
2237 rl_forced_update_display(void)
2238 {
2239         el_set(e, EL_REFRESH);
2240 }
2241
2242 int
2243 _rl_abort_internal(void)
2244 {
2245         el_beep(e);
2246         longjmp(topbuf, 1);
2247         /*NOTREACHED*/
2248 }
2249
2250 int
2251 _rl_qsort_string_compare(char **s1, char **s2)
2252 {
2253         return strcoll(*s1, *s2);
2254 }
2255
2256 HISTORY_STATE *
2257 history_get_history_state(void)
2258 {
2259         HISTORY_STATE *hs;
2260
2261         if ((hs = el_malloc(sizeof(*hs))) == NULL)
2262                 return NULL;
2263         hs->length = history_length;
2264         return hs;
2265 }
2266
2267 int
2268 /*ARGSUSED*/
2269 rl_kill_text(int from __attribute__((__unused__)),
2270     int to __attribute__((__unused__)))
2271 {
2272         return 0;
2273 }
2274
2275 Keymap
2276 rl_make_bare_keymap(void)
2277 {
2278         return NULL;
2279 }
2280
2281 Keymap
2282 rl_get_keymap(void)
2283 {
2284         return NULL;
2285 }
2286
2287 void
2288 /*ARGSUSED*/
2289 rl_set_keymap(Keymap k __attribute__((__unused__)))
2290 {
2291 }
2292
2293 int
2294 /*ARGSUSED*/
2295 rl_generic_bind(int type __attribute__((__unused__)),
2296     const char * keyseq __attribute__((__unused__)),
2297     const char * data __attribute__((__unused__)),
2298     Keymap k __attribute__((__unused__)))
2299 {
2300         return 0;
2301 }
2302
2303 int
2304 /*ARGSUSED*/
2305 rl_bind_key_in_map(int key __attribute__((__unused__)),
2306     rl_command_func_t *fun __attribute__((__unused__)),
2307     Keymap k __attribute__((__unused__)))
2308 {
2309         return 0;
2310 }
2311
2312 /* unsupported, but needed by python */
2313 void
2314 rl_cleanup_after_signal(void)
2315 {
2316 }
2317
2318 int
2319 rl_on_new_line(void)
2320 {
2321         return 0;
2322 }
2323
2324 void
2325 rl_free_line_state(void)
2326 {
2327 }