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 1, 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,
22 675 Mass Ave, Cambridge, MA 02139, 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"
49 #define abs(x) (((x) >= 0) ? (x) : -(x))
51 extern char *xmalloc (), *xrealloc ();
53 /* Variables imported from readline.c */
54 extern int rl_point, rl_end, rl_line_buffer_len;
55 extern int rl_editing_mode;
56 extern char *rl_prompt;
57 extern char *rl_line_buffer;
58 extern HIST_ENTRY *saved_line_for_history;
59 extern Function *rl_last_func;
61 /* Functions imported from the rest of the library. */
62 extern int _rl_free_history_entry ();
63 extern char *_rl_make_prompt_for_search ();
64 extern void rl_extend_line_buffer ();
66 static char *noninc_search_string = (char *) NULL;
67 static int noninc_history_pos;
68 static char *prev_line_found = (char *) NULL;
70 /* Search the history list for STRING starting at absolute history position
71 POS. If STRING begins with `^', the search must match STRING at the
72 beginning of a history line, otherwise a full substring match is performed
73 for STRING. DIR < 0 means to search backwards through the history list,
74 DIR >= 0 means to search forward. */
76 noninc_search_from_pos (string, pos, dir)
82 old = where_history ();
83 history_set_pos (pos);
86 ret = history_search_prefix (string + 1, dir);
88 ret = history_search (string, dir);
91 ret = where_history ();
93 history_set_pos (old);
97 /* Search for a line in the history containing STRING. If DIR is < 0, the
98 search is backwards through previous entries, else through subsequent
101 noninc_dosearch (string, dir)
105 int oldpos, pos, line_len;
108 if (string == 0 || *string == '\0' || noninc_history_pos < 0)
114 pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir);
117 /* Search failed, current history position unchanged. */
118 maybe_unsave_line ();
125 noninc_history_pos = pos;
127 oldpos = where_history ();
128 history_set_pos (noninc_history_pos);
129 entry = current_history ();
130 #if defined (VI_MODE)
131 if (rl_editing_mode != vi_mode)
133 history_set_pos (oldpos);
135 line_len = strlen (entry->line);
136 if (line_len >= rl_line_buffer_len)
137 rl_extend_line_buffer (line_len);
138 strcpy (rl_line_buffer, entry->line);
140 rl_undo_list = (UNDO_LIST *)entry->data;
141 rl_end = strlen (rl_line_buffer);
145 if (saved_line_for_history)
146 _rl_free_history_entry (saved_line_for_history);
147 saved_line_for_history = (HIST_ENTRY *)NULL;
150 /* Search non-interactively through the history list. DIR < 0 means to
151 search backwards through the history of previous commands; otherwise
152 the search is for commands subsequent to the current position in the
153 history list. PCHAR is the character to use for prompting when reading
154 the search string; if not specified (0), it defaults to `:'. */
156 noninc_search (dir, pchar)
164 saved_point = rl_point;
166 /* Use the line buffer to read the search string. */
167 rl_line_buffer[0] = 0;
168 rl_end = rl_point = 0;
170 p = _rl_make_prompt_for_search (pchar ? pchar : ':');
171 rl_message (p, 0, 0);
174 #define SEARCH_RETURN rl_restore_prompt (); return
176 /* Read the search string. */
177 while (c = rl_read_key ())
185 maybe_unsave_line ();
187 rl_point = saved_point;
194 rl_unix_word_rubout (1, c);
198 rl_unix_line_discard (1, c);
209 maybe_unsave_line ();
211 rl_point = saved_point;
219 (*rl_redisplay_function) ();
223 /* If rl_point == 0, we want to re-use the previous search string and
224 start from the saved history position. If there's no previous search
228 if (!noninc_search_string)
236 /* We want to start the search from the current history position. */
237 noninc_history_pos = where_history ();
238 if (noninc_search_string)
239 free (noninc_search_string);
240 noninc_search_string = savestring (rl_line_buffer);
243 rl_restore_prompt ();
244 noninc_dosearch (noninc_search_string, dir);
247 /* Search forward through the history list for a string. If the vi-mode
248 code calls this, KEY will be `?'. */
250 rl_noninc_forward_search (count, key)
253 noninc_search (1, (key == '?') ? '?' : 0);
257 /* Reverse search the history list for a string. If the vi-mode code
258 calls this, KEY will be `/'. */
260 rl_noninc_reverse_search (count, key)
263 noninc_search (-1, (key == '/') ? '/' : 0);
267 /* Search forward through the history list for the last string searched
268 for. If there is no saved search string, abort. */
270 rl_noninc_forward_search_again (count, key)
273 if (!noninc_search_string)
278 noninc_dosearch (noninc_search_string, 1);
282 /* Reverse search in the history list for the last string searched
283 for. If there is no saved search string, abort. */
285 rl_noninc_reverse_search_again (count, key)
288 if (!noninc_search_string)
293 noninc_dosearch (noninc_search_string, -1);
298 rl_history_search_internal (count, direction)
299 int count, direction;
301 HIST_ENTRY *temp, *old_temp;
306 temp = old_temp = (HIST_ENTRY *)NULL;
309 temp = (direction < 0) ? previous_history () : next_history ();
312 /* On an empty prefix, make this the same as previous-history. */
318 if (STREQN (rl_line_buffer, temp->line, rl_point))
320 /* Don't find multiple instances of the same line. */
321 if (prev_line_found && STREQ (prev_line_found, temp->line))
325 prev_line_found = temp->line;
332 if (direction < 0 && old_temp)
336 maybe_unsave_line ();
342 line_len = strlen (temp->line);
343 if (line_len >= rl_line_buffer_len)
344 rl_extend_line_buffer (line_len);
345 strcpy (rl_line_buffer, temp->line);
346 rl_undo_list = (UNDO_LIST *)temp->data;
351 /* Search forward in the history for the string of characters
352 from the start of the line to rl_point. This is a non-incremental
355 rl_history_search_forward (count, ignore)
360 if (rl_last_func != rl_history_search_forward)
361 prev_line_found = (char *)NULL;
362 return (rl_history_search_internal (abs (count), (count > 0) ? 1 : -1));
365 /* Search backward through the history for the string of characters
366 from the start of the line to rl_point. This is a non-incremental
369 rl_history_search_backward (count, ignore)
374 if (rl_last_func != rl_history_search_backward)
375 prev_line_found = (char *)NULL;
376 return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1));