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"
46 #include "rlprivate.h"
52 #define abs(x) (((x) >= 0) ? (x) : -(x))
54 extern HIST_ENTRY *saved_line_for_history;
56 /* Functions imported from the rest of the library. */
57 extern int _rl_free_history_entry __P((HIST_ENTRY *));
59 static char *noninc_search_string = (char *) NULL;
60 static int noninc_history_pos;
62 static char *prev_line_found = (char *) NULL;
64 static int rl_history_search_len;
65 static int rl_history_search_pos;
66 static char *history_search_string;
67 static int history_string_size;
69 /* Make the data from the history entry ENTRY be the contents of the
70 current line. This doesn't do anything with rl_point; the caller
73 make_history_line_current (entry)
78 line_len = strlen (entry->line);
79 if (line_len >= rl_line_buffer_len)
80 rl_extend_line_buffer (line_len);
81 strcpy (rl_line_buffer, entry->line);
83 rl_undo_list = (UNDO_LIST *)entry->data;
86 if (saved_line_for_history)
87 _rl_free_history_entry (saved_line_for_history);
88 saved_line_for_history = (HIST_ENTRY *)NULL;
91 /* Search the history list for STRING starting at absolute history position
92 POS. If STRING begins with `^', the search must match STRING at the
93 beginning of a history line, otherwise a full substring match is performed
94 for STRING. DIR < 0 means to search backwards through the history list,
95 DIR >= 0 means to search forward. */
97 noninc_search_from_pos (string, pos, dir)
103 old = where_history ();
104 history_set_pos (pos);
107 ret = history_search_prefix (string + 1, dir);
109 ret = history_search (string, dir);
112 ret = where_history ();
114 history_set_pos (old);
118 /* Search for a line in the history containing STRING. If DIR is < 0, the
119 search is backwards through previous entries, else through subsequent
122 noninc_dosearch (string, dir)
129 if (string == 0 || *string == '\0' || noninc_history_pos < 0)
135 pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir);
138 /* Search failed, current history position unchanged. */
139 maybe_unsave_line ();
146 noninc_history_pos = pos;
148 oldpos = where_history ();
149 history_set_pos (noninc_history_pos);
150 entry = current_history ();
151 #if defined (VI_MODE)
152 if (rl_editing_mode != vi_mode)
154 history_set_pos (oldpos);
156 make_history_line_current (entry);
162 /* Search non-interactively through the history list. DIR < 0 means to
163 search backwards through the history of previous commands; otherwise
164 the search is for commands subsequent to the current position in the
165 history list. PCHAR is the character to use for prompting when reading
166 the search string; if not specified (0), it defaults to `:'. */
168 noninc_search (dir, pchar)
176 saved_point = rl_point;
178 /* Use the line buffer to read the search string. */
179 rl_line_buffer[0] = 0;
180 rl_end = rl_point = 0;
182 p = _rl_make_prompt_for_search (pchar ? pchar : ':');
183 rl_message (p, 0, 0);
186 #define SEARCH_RETURN rl_restore_prompt (); return
188 /* Read the search string. */
189 while (c = rl_read_key ())
197 maybe_unsave_line ();
199 rl_point = saved_point;
206 rl_unix_word_rubout (1, c);
210 rl_unix_line_discard (1, c);
221 maybe_unsave_line ();
223 rl_point = saved_point;
231 (*rl_redisplay_function) ();
235 /* If rl_point == 0, we want to re-use the previous search string and
236 start from the saved history position. If there's no previous search
240 if (!noninc_search_string)
248 /* We want to start the search from the current history position. */
249 noninc_history_pos = where_history ();
250 FREE (noninc_search_string);
251 noninc_search_string = savestring (rl_line_buffer);
254 rl_restore_prompt ();
255 noninc_dosearch (noninc_search_string, dir);
258 /* Search forward through the history list for a string. If the vi-mode
259 code calls this, KEY will be `?'. */
261 rl_noninc_forward_search (count, key)
264 noninc_search (1, (key == '?') ? '?' : 0);
268 /* Reverse search the history list for a string. If the vi-mode code
269 calls this, KEY will be `/'. */
271 rl_noninc_reverse_search (count, key)
274 noninc_search (-1, (key == '/') ? '/' : 0);
278 /* Search forward through the history list for the last string searched
279 for. If there is no saved search string, abort. */
281 rl_noninc_forward_search_again (count, key)
284 if (!noninc_search_string)
289 noninc_dosearch (noninc_search_string, 1);
293 /* Reverse search in the history list for the last string searched
294 for. If there is no saved search string, abort. */
296 rl_noninc_reverse_search_again (count, key)
299 if (!noninc_search_string)
304 noninc_dosearch (noninc_search_string, -1);
309 rl_history_search_internal (count, dir)
316 temp = (HIST_ENTRY *)NULL;
318 /* Search COUNT times through the history for a line whose prefix
319 matches history_search_string. When this loop finishes, TEMP,
320 if non-null, is the history line to copy into the line buffer. */
323 ret = noninc_search_from_pos (history_search_string, rl_history_search_pos + dir, dir);
327 /* Get the history entry we found. */
328 rl_history_search_pos = ret;
329 oldpos = where_history ();
330 history_set_pos (rl_history_search_pos);
331 temp = current_history ();
332 history_set_pos (oldpos);
334 /* Don't find multiple instances of the same line. */
335 if (prev_line_found && STREQ (prev_line_found, temp->line))
337 prev_line_found = temp->line;
341 /* If we didn't find anything at all, return. */
344 maybe_unsave_line ();
346 /* If you don't want the saved history line (last match) to show up
347 in the line buffer after the search fails, change the #if 0 to
350 if (rl_point > rl_history_search_len)
352 rl_point = rl_end = rl_history_search_len;
353 rl_line_buffer[rl_end] = '\0';
356 rl_point = rl_history_search_len; /* maybe_unsave_line changes it */
361 /* Copy the line we found into the current line buffer. */
362 make_history_line_current (temp);
364 rl_point = rl_history_search_len;
369 rl_history_search_reinit ()
371 rl_history_search_pos = where_history ();
372 rl_history_search_len = rl_point;
373 prev_line_found = (char *)NULL;
376 if (rl_history_search_len >= history_string_size - 2)
378 history_string_size = rl_history_search_len + 2;
379 history_search_string = xrealloc (history_search_string, history_string_size);
381 history_search_string[0] = '^';
382 strncpy (history_search_string + 1, rl_line_buffer, rl_point);
383 history_search_string[rl_point + 1] = '\0';
387 /* Search forward in the history for the string of characters
388 from the start of the line to rl_point. This is a non-incremental
391 rl_history_search_forward (count, ignore)
397 if (rl_last_func != rl_history_search_forward &&
398 rl_last_func != rl_history_search_backward)
399 rl_history_search_reinit ();
401 if (rl_history_search_len == 0)
402 return (rl_get_next_history (count, ignore));
403 return (rl_history_search_internal (abs (count), (count > 0) ? 1 : -1));
406 /* Search backward through the history for the string of characters
407 from the start of the line to rl_point. This is a non-incremental
410 rl_history_search_backward (count, ignore)
416 if (rl_last_func != rl_history_search_forward &&
417 rl_last_func != rl_history_search_backward)
418 rl_history_search_reinit ();
420 if (rl_history_search_len == 0)
421 return (rl_get_previous_history (count, ignore));
422 return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1));