1 /* search.c - code for non-incremental searching in emacs and vi modes. */
3 /* Copyright (C) 1992 Free Software Foundation, Inc.
5 This file is part of the Readline Library (the Library), a set of
6 routines for providing Emacs style line input to programs that ask
9 The Library is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 The Library is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 The GNU General Public License is often shipped with GNU software, and
20 is generally kept in a file called COPYING or LICENSE. If you do not
21 have a copy of the license, write to the Free Software Foundation,
22 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
23 #define READLINE_LIBRARY
25 #if defined (HAVE_CONFIG_H)
29 #include <sys/types.h>
32 #if defined (HAVE_UNISTD_H)
36 #if defined (HAVE_STDLIB_H)
39 # include "ansi_stdlib.h"
48 #include "rlprivate.h"
54 #define abs(x) (((x) >= 0) ? (x) : -(x))
56 extern HIST_ENTRY *_rl_saved_line_for_history;
58 /* Functions imported from the rest of the library. */
59 extern int _rl_free_history_entry PARAMS((HIST_ENTRY *));
61 static char *noninc_search_string = (char *) NULL;
62 static int noninc_history_pos;
64 static char *prev_line_found = (char *) NULL;
66 static int rl_history_search_len;
67 static int rl_history_search_pos;
68 static char *history_search_string;
69 static int history_string_size;
71 static void make_history_line_current PARAMS((HIST_ENTRY *));
72 static int noninc_search_from_pos PARAMS((char *, int, int));
73 static void noninc_dosearch PARAMS((char *, int));
74 static void noninc_search PARAMS((int, int));
75 static int rl_history_search_internal PARAMS((int, int));
76 static void rl_history_search_reinit PARAMS((void));
78 /* Make the data from the history entry ENTRY be the contents of the
79 current line. This doesn't do anything with rl_point; the caller
82 make_history_line_current (entry)
85 rl_replace_line (entry->line, 0);
86 rl_undo_list = (UNDO_LIST *)entry->data;
88 if (_rl_saved_line_for_history)
89 _rl_free_history_entry (_rl_saved_line_for_history);
90 _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
93 /* Search the history list for STRING starting at absolute history position
94 POS. If STRING begins with `^', the search must match STRING at the
95 beginning of a history line, otherwise a full substring match is performed
96 for STRING. DIR < 0 means to search backwards through the history list,
97 DIR >= 0 means to search forward. */
99 noninc_search_from_pos (string, pos, dir)
108 old = where_history ();
109 if (history_set_pos (pos) == 0)
112 RL_SETSTATE(RL_STATE_SEARCH);
114 ret = history_search_prefix (string + 1, dir);
116 ret = history_search (string, dir);
117 RL_UNSETSTATE(RL_STATE_SEARCH);
120 ret = where_history ();
122 history_set_pos (old);
126 /* Search for a line in the history containing STRING. If DIR is < 0, the
127 search is backwards through previous entries, else through subsequent
130 noninc_dosearch (string, dir)
137 if (string == 0 || *string == '\0' || noninc_history_pos < 0)
143 pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir);
146 /* Search failed, current history position unchanged. */
147 rl_maybe_unsave_line ();
154 noninc_history_pos = pos;
156 oldpos = where_history ();
157 history_set_pos (noninc_history_pos);
158 entry = current_history ();
159 #if defined (VI_MODE)
160 if (rl_editing_mode != vi_mode)
162 history_set_pos (oldpos);
164 make_history_line_current (entry);
172 /* Search non-interactively through the history list. DIR < 0 means to
173 search backwards through the history of previous commands; otherwise
174 the search is for commands subsequent to the current position in the
175 history list. PCHAR is the character to use for prompting when reading
176 the search string; if not specified (0), it defaults to `:'. */
178 noninc_search (dir, pchar)
182 int saved_point, saved_mark, c;
184 #if defined (HANDLE_MULTIBYTE)
188 rl_maybe_save_line ();
189 saved_point = rl_point;
190 saved_mark = rl_mark;
192 /* Use the line buffer to read the search string. */
193 rl_line_buffer[0] = 0;
194 rl_end = rl_point = 0;
196 p = _rl_make_prompt_for_search (pchar ? pchar : ':');
197 rl_message (p, 0, 0);
200 #define SEARCH_RETURN rl_restore_prompt (); RL_UNSETSTATE(RL_STATE_NSEARCH); return
202 RL_SETSTATE(RL_STATE_NSEARCH);
203 /* Read the search string. */
206 RL_SETSTATE(RL_STATE_MOREINPUT);
208 RL_UNSETSTATE(RL_STATE_MOREINPUT);
210 #if defined (HANDLE_MULTIBYTE)
211 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
212 c = _rl_read_mbstring (c, mb, MB_LEN_MAX);
224 rl_maybe_unsave_line ();
226 rl_point = saved_point;
227 rl_mark = saved_mark;
230 _rl_rubout_char (1, c);
234 rl_unix_word_rubout (1, c);
238 rl_unix_line_discard (1, c);
249 rl_maybe_unsave_line ();
251 rl_point = saved_point;
252 rl_mark = saved_mark;
257 #if defined (HANDLE_MULTIBYTE)
258 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
262 _rl_insert_char (1, c);
265 (*rl_redisplay_function) ();
269 rl_mark = saved_mark;
271 /* If rl_point == 0, we want to re-use the previous search string and
272 start from the saved history position. If there's no previous search
276 if (!noninc_search_string)
284 /* We want to start the search from the current history position. */
285 noninc_history_pos = where_history ();
286 FREE (noninc_search_string);
287 noninc_search_string = savestring (rl_line_buffer);
290 rl_restore_prompt ();
291 noninc_dosearch (noninc_search_string, dir);
292 RL_UNSETSTATE(RL_STATE_NSEARCH);
295 /* Search forward through the history list for a string. If the vi-mode
296 code calls this, KEY will be `?'. */
298 rl_noninc_forward_search (count, key)
301 noninc_search (1, (key == '?') ? '?' : 0);
305 /* Reverse search the history list for a string. If the vi-mode code
306 calls this, KEY will be `/'. */
308 rl_noninc_reverse_search (count, key)
311 noninc_search (-1, (key == '/') ? '/' : 0);
315 /* Search forward through the history list for the last string searched
316 for. If there is no saved search string, abort. */
318 rl_noninc_forward_search_again (count, key)
321 if (!noninc_search_string)
326 noninc_dosearch (noninc_search_string, 1);
330 /* Reverse search in the history list for the last string searched
331 for. If there is no saved search string, abort. */
333 rl_noninc_reverse_search_again (count, key)
336 if (!noninc_search_string)
341 noninc_dosearch (noninc_search_string, -1);
346 rl_history_search_internal (count, dir)
352 rl_maybe_save_line ();
353 temp = (HIST_ENTRY *)NULL;
355 /* Search COUNT times through the history for a line whose prefix
356 matches history_search_string. When this loop finishes, TEMP,
357 if non-null, is the history line to copy into the line buffer. */
360 ret = noninc_search_from_pos (history_search_string, rl_history_search_pos + dir, dir);
364 /* Get the history entry we found. */
365 rl_history_search_pos = ret;
366 oldpos = where_history ();
367 history_set_pos (rl_history_search_pos);
368 temp = current_history ();
369 history_set_pos (oldpos);
371 /* Don't find multiple instances of the same line. */
372 if (prev_line_found && STREQ (prev_line_found, temp->line))
374 prev_line_found = temp->line;
378 /* If we didn't find anything at all, return. */
381 rl_maybe_unsave_line ();
383 /* If you don't want the saved history line (last match) to show up
384 in the line buffer after the search fails, change the #if 0 to
387 if (rl_point > rl_history_search_len)
389 rl_point = rl_end = rl_history_search_len;
390 rl_line_buffer[rl_end] = '\0';
394 rl_point = rl_history_search_len; /* rl_maybe_unsave_line changes it */
400 /* Copy the line we found into the current line buffer. */
401 make_history_line_current (temp);
403 rl_point = rl_history_search_len;
410 rl_history_search_reinit ()
412 rl_history_search_pos = where_history ();
413 rl_history_search_len = rl_point;
414 prev_line_found = (char *)NULL;
417 if (rl_history_search_len >= history_string_size - 2)
419 history_string_size = rl_history_search_len + 2;
420 history_search_string = (char *)xrealloc (history_search_string, history_string_size);
422 history_search_string[0] = '^';
423 strncpy (history_search_string + 1, rl_line_buffer, rl_point);
424 history_search_string[rl_point + 1] = '\0';
426 _rl_free_saved_history_line ();
429 /* Search forward in the history for the string of characters
430 from the start of the line to rl_point. This is a non-incremental
433 rl_history_search_forward (count, ignore)
439 if (rl_last_func != rl_history_search_forward &&
440 rl_last_func != rl_history_search_backward)
441 rl_history_search_reinit ();
443 if (rl_history_search_len == 0)
444 return (rl_get_next_history (count, ignore));
445 return (rl_history_search_internal (abs (count), (count > 0) ? 1 : -1));
448 /* Search backward through the history for the string of characters
449 from the start of the line to rl_point. This is a non-incremental
452 rl_history_search_backward (count, ignore)
458 if (rl_last_func != rl_history_search_forward &&
459 rl_last_func != rl_history_search_backward)
460 rl_history_search_reinit ();
462 if (rl_history_search_len == 0)
463 return (rl_get_previous_history (count, ignore));
464 return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1));