contrib/gdb-7/readline/isearch.c

   1 /* isearch.c - incremental searching */
   2
   3 /* **************************************************************** */
   4 /*                                                                  */
   5 /*                      I-Search and Searching                      */
   6 /*                                                                  */
   7 /* **************************************************************** */
   8
   9 /* Copyright (C) 1987-2009 Free Software Foundation, Inc.
  10
  11    This file is part of the GNU Readline Library (Readline), a library
  12    for reading lines of text with interactive input and history editing.
  13
  14    Readline is free software: you can redistribute it and/or modify
  15    it under the terms of the GNU General Public License as published by
  16    the Free Software Foundation, either version 3 of the License, or
  17    (at your option) any later version.
  18
  19    Readline is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
  26 */
  27
  28 #define READLINE_LIBRARY
  29
  30 #if defined (HAVE_CONFIG_H)
  31 #  include <config.h>
  32 #endif
  33
  34 #include <sys/types.h>
  35
  36 #include <stdio.h>
  37
  38 #if defined (HAVE_UNISTD_H)
  39 #  include <unistd.h>
  40 #endif
  41
  42 #if defined (HAVE_STDLIB_H)
  43 #  include <stdlib.h>
  44 #else
  45 #  include "ansi_stdlib.h"
  46 #endif
  47
  48 #include "rldefs.h"
  49 #include "rlmbutil.h"
  50
  51 #include "readline.h"
  52 #include "history.h"
  53
  54 #include "rlprivate.h"
  55 #include "xmalloc.h"
  56
  57 /* Variables exported to other files in the readline library. */
  58 char *_rl_isearch_terminators = (char *)NULL;
  59
  60 _rl_search_cxt *_rl_iscxt = 0;
  61
  62 /* Variables imported from other files in the readline library. */
  63 extern HIST_ENTRY *_rl_saved_line_for_history;
  64
  65 static int rl_search_history PARAMS((int, int));
  66
  67 static _rl_search_cxt *_rl_isearch_init PARAMS((int));
  68 static void _rl_isearch_fini PARAMS((_rl_search_cxt *));
  69 static int _rl_isearch_cleanup PARAMS((_rl_search_cxt *, int));
  70
  71 /* Last line found by the current incremental search, so we don't `find'
  72    identical lines many times in a row.  Now part of isearch context. */
  73 /* static char *prev_line_found; */
  74
  75 /* Last search string and its length. */
  76 static char *last_isearch_string;
  77 static int last_isearch_string_len;
  78
  79 static char * const default_isearch_terminators = "\033\012";
  80
  81 _rl_search_cxt *
  82 _rl_scxt_alloc (type, flags)
  83      int type, flags;
  84 {
  85   _rl_search_cxt *cxt;
  86
  87   cxt = (_rl_search_cxt *)xmalloc (sizeof (_rl_search_cxt));
  88
  89   cxt->type = type;
  90   cxt->sflags = flags;
  91
  92   cxt->search_string = 0;
  93   cxt->search_string_size = cxt->search_string_index = 0;
  94
  95   cxt->lines = 0;
  96   cxt->allocated_line = 0;
  97   cxt->hlen = cxt->hindex = 0;
  98
  99   cxt->save_point = rl_point;
 100   cxt->save_mark = rl_mark;
 101   cxt->save_line = where_history ();
 102   cxt->last_found_line = cxt->save_line;
 103   cxt->prev_line_found = 0;
 104
 105   cxt->save_undo_list = 0;
 106
 107   cxt->keymap = _rl_keymap;
 108   cxt->okeymap = _rl_keymap;
 109
 110   cxt->history_pos = 0;
 111   cxt->direction = 0;
 112
 113   cxt->lastc = 0;
 114
 115   cxt->sline = 0;
 116   cxt->sline_len = cxt->sline_index = 0;
 117
 118   cxt->search_terminators = 0;
 119
 120   return cxt;
 121 }
 122
 123 void
 124 _rl_scxt_dispose (cxt, flags)
 125      _rl_search_cxt *cxt;
 126      int flags;
 127 {
 128   FREE (cxt->search_string);
 129   FREE (cxt->allocated_line);
 130   FREE (cxt->lines);
 131
 132   xfree (cxt);
 133 }
 134
 135 /* Search backwards through the history looking for a string which is typed
 136    interactively.  Start with the current line. */
 137 int
 138 rl_reverse_search_history (sign, key)
 139      int sign, key;
 140 {
 141   return (rl_search_history (-sign, key));
 142 }
 143
 144 /* Search forwards through the history looking for a string which is typed
 145    interactively.  Start with the current line. */
 146 int
 147 rl_forward_search_history (sign, key)
 148      int sign, key;
 149 {
 150   return (rl_search_history (sign, key));
 151 }
 152
 153 /* Display the current state of the search in the echo-area.
 154    SEARCH_STRING contains the string that is being searched for,
 155    DIRECTION is zero for forward, or non-zero for reverse,
 156    WHERE is the history list number of the current line.  If it is
 157    -1, then this line is the starting one. */
 158 static void
 159 rl_display_search (search_string, reverse_p, where)
 160      char *search_string;
 161      int reverse_p, where;
 162 {
 163   char *message;
 164   int msglen, searchlen;
 165
 166   searchlen = (search_string && *search_string) ? strlen (search_string) : 0;
 167
 168   message = (char *)xmalloc (searchlen + 33);
 169   msglen = 0;
 170
 171 #if defined (NOTDEF)
 172   if (where != -1)
 173     {
 174       sprintf (message, "[%d]", where + history_base);
 175       msglen = strlen (message);
 176     }
 177 #endif /* NOTDEF */
 178
 179   message[msglen++] = '(';
 180
 181   if (reverse_p)
 182     {
 183       strcpy (message + msglen, "reverse-");
 184       msglen += 8;
 185     }
 186
 187   strcpy (message + msglen, "i-search)`");
 188   msglen += 10;
 189
 190   if (search_string)
 191     {
 192       strcpy (message + msglen, search_string);
 193       msglen += searchlen;
 194     }
 195
 196   strcpy (message + msglen, "': ");
 197
 198   rl_message ("%s", message);
 199   xfree (message);
 200   (*rl_redisplay_function) ();
 201 }
 202
 203 static _rl_search_cxt *
 204 _rl_isearch_init (direction)
 205      int direction;
 206 {
 207   _rl_search_cxt *cxt;
 208   register int i;
 209   HIST_ENTRY **hlist;
 210
 211   cxt = _rl_scxt_alloc (RL_SEARCH_ISEARCH, 0);
 212   if (direction < 0)
 213     cxt->sflags |= SF_REVERSE;
 214
 215   cxt->search_terminators = _rl_isearch_terminators ? _rl_isearch_terminators
 216                                                 : default_isearch_terminators;
 217
 218   /* Create an arrary of pointers to the lines that we want to search. */
 219   hlist = history_list ();
 220   rl_maybe_replace_line ();
 221   i = 0;
 222   if (hlist)
 223     for (i = 0; hlist[i]; i++);
 224
 225   /* Allocate space for this many lines, +1 for the current input line,
 226      and remember those lines. */
 227   cxt->lines = (char **)xmalloc ((1 + (cxt->hlen = i)) * sizeof (char *));
 228   for (i = 0; i < cxt->hlen; i++)
 229     cxt->lines[i] = hlist[i]->line;
 230
 231   if (_rl_saved_line_for_history)
 232     cxt->lines[i] = _rl_saved_line_for_history->line;
 233   else
 234     {
 235       /* Keep track of this so we can free it. */
 236       cxt->allocated_line = (char *)xmalloc (1 + strlen (rl_line_buffer));
 237       strcpy (cxt->allocated_line, &rl_line_buffer[0]);
 238       cxt->lines[i] = cxt->allocated_line;
 239     }
 240
 241   cxt->hlen++;
 242
 243   /* The line where we start the search. */
 244   cxt->history_pos = cxt->save_line;
 245
 246   rl_save_prompt ();
 247
 248   /* Initialize search parameters. */
 249   cxt->search_string = (char *)xmalloc (cxt->search_string_size = 128);
 250   cxt->search_string[cxt->search_string_index = 0] = '\0';
 251
 252   /* Normalize DIRECTION into 1 or -1. */
 253   cxt->direction = (direction >= 0) ? 1 : -1;
 254
 255   cxt->sline = rl_line_buffer;
 256   cxt->sline_len = strlen (cxt->sline);
 257   cxt->sline_index = rl_point;
 258
 259   _rl_iscxt = cxt;              /* save globally */
 260
 261   return cxt;
 262 }
 263
 264 static void
 265 _rl_isearch_fini (cxt)
 266      _rl_search_cxt *cxt;
 267 {
 268   /* First put back the original state. */
 269   strcpy (rl_line_buffer, cxt->lines[cxt->save_line]);
 270
 271   rl_restore_prompt ();
 272
 273   /* Save the search string for possible later use. */
 274   FREE (last_isearch_string);
 275   last_isearch_string = cxt->search_string;
 276   last_isearch_string_len = cxt->search_string_index;
 277   cxt->search_string = 0;
 278
 279   if (cxt->last_found_line < cxt->save_line)
 280     rl_get_previous_history (cxt->save_line - cxt->last_found_line, 0);
 281   else
 282     rl_get_next_history (cxt->last_found_line - cxt->save_line, 0);
 283
 284   /* If the string was not found, put point at the end of the last matching
 285      line.  If last_found_line == orig_line, we didn't find any matching
 286      history lines at all, so put point back in its original position. */
 287   if (cxt->sline_index < 0)
 288     {
 289       if (cxt->last_found_line == cxt->save_line)
 290         cxt->sline_index = cxt->save_point;
 291       else
 292         cxt->sline_index = strlen (rl_line_buffer);
 293       rl_mark = cxt->save_mark;
 294     }
 295
 296   rl_point = cxt->sline_index;
 297   /* Don't worry about where to put the mark here; rl_get_previous_history
 298      and rl_get_next_history take care of it. */
 299
 300   rl_clear_message ();
 301 }
 302
 303 int
 304 _rl_search_getchar (cxt)
 305      _rl_search_cxt *cxt;
 306 {
 307   int c;
 308
 309   /* Read a key and decide how to proceed. */
 310   RL_SETSTATE(RL_STATE_MOREINPUT);
 311   c = cxt->lastc = rl_read_key ();
 312   RL_UNSETSTATE(RL_STATE_MOREINPUT);
 313
 314 #if defined (HANDLE_MULTIBYTE)
 315   if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
 316     c = cxt->lastc = _rl_read_mbstring (cxt->lastc, cxt->mb, MB_LEN_MAX);
 317 #endif
 318
 319   return c;
 320 }
 321
 322 /* Process just-read character C according to isearch context CXT.  Return
 323    -1 if the caller should just free the context and return, 0 if we should
 324    break out of the loop, and 1 if we should continue to read characters. */
 325 int
 326 _rl_isearch_dispatch (cxt, c)
 327      _rl_search_cxt *cxt;
 328      int c;
 329 {
 330   int n, wstart, wlen, limit, cval;
 331   rl_command_func_t *f;
 332
 333   f = (rl_command_func_t *)NULL;
 334
 335   if (c < 0)
 336     {
 337       cxt->sflags |= SF_FAILED;
 338       cxt->history_pos = cxt->last_found_line;
 339       return -1;
 340     }
 341
 342   /* If we are moving into a new keymap, modify cxt->keymap and go on.
 343      This can be a problem if c == ESC and we want to terminate the
 344      incremental search, so we check */
 345   if (c >= 0 && cxt->keymap[c].type == ISKMAP && strchr (cxt->search_terminators, cxt->lastc) == 0)
 346     {
 347       cxt->keymap = FUNCTION_TO_KEYMAP (cxt->keymap, c);
 348       cxt->sflags |= SF_CHGKMAP;
 349       /* XXX - we should probably save this sequence, so we can do
 350          something useful if this doesn't end up mapping to a command. */
 351       return 1;
 352     }
 353
 354   /* Translate the keys we do something with to opcodes. */
 355   if (c >= 0 && cxt->keymap[c].type == ISFUNC)
 356     {
 357       f = cxt->keymap[c].function;
 358
 359       if (f == rl_reverse_search_history)
 360         cxt->lastc = (cxt->sflags & SF_REVERSE) ? -1 : -2;
 361       else if (f == rl_forward_search_history)
 362         cxt->lastc = (cxt->sflags & SF_REVERSE) ? -2 : -1;
 363       else if (f == rl_rubout)
 364         cxt->lastc = -3;
 365       else if (c == CTRL ('G') || f == rl_abort)
 366         cxt->lastc = -4;
 367       else if (c == CTRL ('W') || f == rl_unix_word_rubout)     /* XXX */
 368         cxt->lastc = -5;
 369       else if (c == CTRL ('Y') || f == rl_yank) /* XXX */
 370         cxt->lastc = -6;
 371     }
 372
 373   /* If we changed the keymap earlier while translating a key sequence into
 374      a command, restore it now that we've succeeded. */
 375   if (cxt->sflags & SF_CHGKMAP)
 376     {
 377       cxt->keymap = cxt->okeymap;
 378       cxt->sflags &= ~SF_CHGKMAP;
 379     }
 380
 381   /* The characters in isearch_terminators (set from the user-settable
 382      variable isearch-terminators) are used to terminate the search but
 383      not subsequently execute the character as a command.  The default
 384      value is "\033\012" (ESC and C-J). */
 385   if (cxt->lastc > 0 && strchr (cxt->search_terminators, cxt->lastc))
 386     {
 387       /* ESC still terminates the search, but if there is pending
 388          input or if input arrives within 0.1 seconds (on systems
 389          with select(2)) it is used as a prefix character
 390          with rl_execute_next.  WATCH OUT FOR THIS!  This is intended
 391          to allow the arrow keys to be used like ^F and ^B are used
 392          to terminate the search and execute the movement command.
 393          XXX - since _rl_input_available depends on the application-
 394          settable keyboard timeout value, this could alternatively
 395          use _rl_input_queued(100000) */
 396       if (cxt->lastc == ESC && _rl_input_available ())
 397         rl_execute_next (ESC);
 398       return (0);
 399     }
 400
 401 #define ENDSRCH_CHAR(c) \
 402   ((CTRL_CHAR (c) || META_CHAR (c) || (c) == RUBOUT) && ((c) != CTRL ('G')))
 403
 404 #if defined (HANDLE_MULTIBYTE)
 405   if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
 406     {
 407       if (cxt->lastc >= 0 && (cxt->mb[0] && cxt->mb[1] == '\0') && ENDSRCH_CHAR (cxt->lastc))
 408         {
 409           /* This sets rl_pending_input to LASTC; it will be picked up the next
 410              time rl_read_key is called. */
 411           rl_execute_next (cxt->lastc);
 412           return (0);
 413         }
 414     }
 415   else
 416 #endif
 417     if (cxt->lastc >= 0 && ENDSRCH_CHAR (cxt->lastc))
 418       {
 419         /* This sets rl_pending_input to LASTC; it will be picked up the next
 420            time rl_read_key is called. */
 421         rl_execute_next (cxt->lastc);
 422         return (0);
 423       }
 424
 425   /* Now dispatch on the character.  `Opcodes' affect the search string or
 426      state.  Other characters are added to the string.  */
 427   switch (cxt->lastc)
 428     {
 429     /* search again */
 430     case -1:
 431       if (cxt->search_string_index == 0)
 432         {
 433           if (last_isearch_string)
 434             {
 435               cxt->search_string_size = 64 + last_isearch_string_len;
 436               cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
 437               strcpy (cxt->search_string, last_isearch_string);
 438               cxt->search_string_index = last_isearch_string_len;
 439               rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), -1);
 440               break;
 441             }
 442           return (1);
 443         }
 444       else if (cxt->sflags & SF_REVERSE)
 445         cxt->sline_index--;
 446       else if (cxt->sline_index != cxt->sline_len)
 447         cxt->sline_index++;
 448       else
 449         rl_ding ();
 450       break;
 451
 452     /* switch directions */
 453     case -2:
 454       cxt->direction = -cxt->direction;
 455       if (cxt->direction < 0)
 456         cxt->sflags |= SF_REVERSE;
 457       else
 458         cxt->sflags &= ~SF_REVERSE;
 459       break;
 460
 461     /* delete character from search string. */
 462     case -3:    /* C-H, DEL */
 463       /* This is tricky.  To do this right, we need to keep a
 464          stack of search positions for the current search, with
 465          sentinels marking the beginning and end.  But this will
 466          do until we have a real isearch-undo. */
 467       if (cxt->search_string_index == 0)
 468         rl_ding ();
 469       else
 470         cxt->search_string[--cxt->search_string_index] = '\0';
 471       break;
 472
 473     case -4:    /* C-G, abort */
 474       rl_replace_line (cxt->lines[cxt->save_line], 0);
 475       rl_point = cxt->save_point;
 476       rl_mark = cxt->save_mark;
 477       rl_restore_prompt();
 478       rl_clear_message ();
 479
 480       return -1;
 481
 482     case -5:    /* C-W */
 483       /* skip over portion of line we already matched and yank word */
 484       wstart = rl_point + cxt->search_string_index;
 485       if (wstart >= rl_end)
 486         {
 487           rl_ding ();
 488           break;
 489         }
 490
 491       /* if not in a word, move to one. */
 492       cval = _rl_char_value (rl_line_buffer, wstart);
 493       if (_rl_walphabetic (cval) == 0)
 494         {
 495           rl_ding ();
 496           break;
 497         }
 498       n = MB_NEXTCHAR (rl_line_buffer, wstart, 1, MB_FIND_NONZERO);;
 499       while (n < rl_end)
 500         {
 501           cval = _rl_char_value (rl_line_buffer, n);
 502           if (_rl_walphabetic (cval) == 0)
 503             break;
 504           n = MB_NEXTCHAR (rl_line_buffer, n, 1, MB_FIND_NONZERO);;
 505         }
 506       wlen = n - wstart + 1;
 507       if (cxt->search_string_index + wlen + 1 >= cxt->search_string_size)
 508         {
 509           cxt->search_string_size += wlen + 1;
 510           cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
 511         }
 512       for (; wstart < n; wstart++)
 513         cxt->search_string[cxt->search_string_index++] = rl_line_buffer[wstart];
 514       cxt->search_string[cxt->search_string_index] = '\0';
 515       break;
 516
 517     case -6:    /* C-Y */
 518       /* skip over portion of line we already matched and yank rest */
 519       wstart = rl_point + cxt->search_string_index;
 520       if (wstart >= rl_end)
 521         {
 522           rl_ding ();
 523           break;
 524         }
 525       n = rl_end - wstart + 1;
 526       if (cxt->search_string_index + n + 1 >= cxt->search_string_size)
 527         {
 528           cxt->search_string_size += n + 1;
 529           cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
 530         }
 531       for (n = wstart; n < rl_end; n++)
 532         cxt->search_string[cxt->search_string_index++] = rl_line_buffer[n];
 533       cxt->search_string[cxt->search_string_index] = '\0';
 534       break;
 535
 536     /* Add character to search string and continue search. */
 537     default:
 538       if (cxt->search_string_index + 2 >= cxt->search_string_size)
 539         {
 540           cxt->search_string_size += 128;
 541           cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
 542         }
 543 #if defined (HANDLE_MULTIBYTE)
 544       if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
 545         {
 546           int j, l;
 547           for (j = 0, l = strlen (cxt->mb); j < l; )
 548             cxt->search_string[cxt->search_string_index++] = cxt->mb[j++];
 549         }
 550       else
 551 #endif
 552         cxt->search_string[cxt->search_string_index++] = c;
 553       cxt->search_string[cxt->search_string_index] = '\0';
 554       break;
 555     }
 556
 557   for (cxt->sflags &= ~(SF_FOUND|SF_FAILED);; )
 558     {
 559       limit = cxt->sline_len - cxt->search_string_index + 1;
 560
 561       /* Search the current line. */
 562       while ((cxt->sflags & SF_REVERSE) ? (cxt->sline_index >= 0) : (cxt->sline_index < limit))
 563         {
 564           if (STREQN (cxt->search_string, cxt->sline + cxt->sline_index, cxt->search_string_index))
 565             {
 566               cxt->sflags |= SF_FOUND;
 567               break;
 568             }
 569           else
 570             cxt->sline_index += cxt->direction;
 571         }
 572       if (cxt->sflags & SF_FOUND)
 573         break;
 574
 575       /* Move to the next line, but skip new copies of the line
 576          we just found and lines shorter than the string we're
 577          searching for. */
 578       do
 579         {
 580           /* Move to the next line. */
 581           cxt->history_pos += cxt->direction;
 582
 583           /* At limit for direction? */
 584           if ((cxt->sflags & SF_REVERSE) ? (cxt->history_pos < 0) : (cxt->history_pos == cxt->hlen))
 585             {
 586               cxt->sflags |= SF_FAILED;
 587               break;
 588             }
 589
 590           /* We will need these later. */
 591           cxt->sline = cxt->lines[cxt->history_pos];
 592           cxt->sline_len = strlen (cxt->sline);
 593         }
 594       while ((cxt->prev_line_found && STREQ (cxt->prev_line_found, cxt->lines[cxt->history_pos])) ||
 595              (cxt->search_string_index > cxt->sline_len));
 596
 597       if (cxt->sflags & SF_FAILED)
 598         break;
 599
 600       /* Now set up the line for searching... */
 601       cxt->sline_index = (cxt->sflags & SF_REVERSE) ? cxt->sline_len - cxt->search_string_index : 0;
 602     }
 603
 604   if (cxt->sflags & SF_FAILED)
 605     {
 606       /* We cannot find the search string.  Ding the bell. */
 607       rl_ding ();
 608       cxt->history_pos = cxt->last_found_line;
 609       return 1;
 610     }
 611
 612   /* We have found the search string.  Just display it.  But don't
 613      actually move there in the history list until the user accepts
 614      the location. */
 615   if (cxt->sflags & SF_FOUND)
 616     {
 617       cxt->prev_line_found = cxt->lines[cxt->history_pos];
 618       rl_replace_line (cxt->lines[cxt->history_pos], 0);
 619       rl_point = cxt->sline_index;
 620       cxt->last_found_line = cxt->history_pos;
 621       rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), (cxt->history_pos == cxt->save_line) ? -1 : cxt->history_pos);
 622     }
 623
 624   return 1;
 625 }
 626
 627 static int
 628 _rl_isearch_cleanup (cxt, r)
 629      _rl_search_cxt *cxt;
 630      int r;
 631 {
 632   if (r >= 0)
 633     _rl_isearch_fini (cxt);
 634   _rl_scxt_dispose (cxt, 0);
 635   _rl_iscxt = 0;
 636
 637   RL_UNSETSTATE(RL_STATE_ISEARCH);
 638
 639   return (r != 0);
 640 }
 641
 642 /* Search through the history looking for an interactively typed string.
 643    This is analogous to i-search.  We start the search in the current line.
 644    DIRECTION is which direction to search; >= 0 means forward, < 0 means
 645    backwards. */
 646 static int
 647 rl_search_history (direction, invoking_key)
 648      int direction, invoking_key;
 649 {
 650   _rl_search_cxt *cxt;          /* local for now, but saved globally */
 651   int c, r;
 652
 653   RL_SETSTATE(RL_STATE_ISEARCH);
 654   cxt = _rl_isearch_init (direction);
 655
 656   rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), -1);
 657
 658   /* If we are using the callback interface, all we do is set up here and
 659       return.  The key is that we leave RL_STATE_ISEARCH set. */
 660   if (RL_ISSTATE (RL_STATE_CALLBACK))
 661     return (0);
 662
 663   r = -1;
 664   for (;;)
 665     {
 666       c = _rl_search_getchar (cxt);
 667       /* We might want to handle EOF here (c == 0) */
 668       r = _rl_isearch_dispatch (cxt, cxt->lastc);
 669       if (r <= 0)
 670         break;
 671     }
 672
 673   /* The searching is over.  The user may have found the string that she
 674      was looking for, or else she may have exited a failing search.  If
 675      LINE_INDEX is -1, then that shows that the string searched for was
 676      not found.  We use this to determine where to place rl_point. */
 677   return (_rl_isearch_cleanup (cxt, r));
 678 }
 679
 680 #if defined (READLINE_CALLBACKS)
 681 /* Called from the callback functions when we are ready to read a key.  The
 682    callback functions know to call this because RL_ISSTATE(RL_STATE_ISEARCH).
 683    If _rl_isearch_dispatch finishes searching, this function is responsible
 684    for turning off RL_STATE_ISEARCH, which it does using _rl_isearch_cleanup. */
 685 int
 686 _rl_isearch_callback (cxt)
 687      _rl_search_cxt *cxt;
 688 {
 689   int c, r;
 690
 691   c = _rl_search_getchar (cxt);
 692   /* We might want to handle EOF here */
 693   r = _rl_isearch_dispatch (cxt, cxt->lastc);
 694
 695   return (r <= 0) ? _rl_isearch_cleanup (cxt, r) : 0;
 696 }
 697 #endif