1 /* **************************************************************** */
3 /* I-Search and Searching */
5 /* **************************************************************** */
7 /* Copyright (C) 1987,1989 Free Software Foundation, Inc.
9 This file contains the Readline Library (the Library), a set of
10 routines for providing Emacs style line input to programs that ask
13 The Library is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 1, or (at your option)
18 The Library is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 The GNU General Public License is often shipped with GNU software, and
24 is generally kept in a file called COPYING or LICENSE. If you do not
25 have a copy of the license, write to the Free Software Foundation,
26 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #define READLINE_LIBRARY
29 #if defined (HAVE_CONFIG_H)
35 #if defined (HAVE_UNISTD_H)
39 #include <sys/types.h>
45 /* Variables imported from other files in the readline library. */
46 extern Keymap _rl_keymap;
47 extern HIST_ENTRY *saved_line_for_history;
48 extern int rl_line_buffer_len;
49 extern int rl_point, rl_end;
50 extern char *rl_line_buffer;
52 extern void _rl_save_prompt ();
53 extern void _rl_restore_prompt ();
55 extern int rl_execute_next ();
56 extern void rl_extend_line_buffer ();
58 extern int _rl_input_available ();
60 extern char *xmalloc (), *xrealloc ();
62 static int rl_search_history ();
64 /* Last line found by the current incremental search, so we don't `find'
65 identical lines many times in a row. */
66 static char *prev_line_found;
68 /* Search backwards through the history looking for a string which is typed
69 interactively. Start with the current line. */
71 rl_reverse_search_history (sign, key)
74 return (rl_search_history (-sign, key));
77 /* Search forwards through the history looking for a string which is typed
78 interactively. Start with the current line. */
80 rl_forward_search_history (sign, key)
83 return (rl_search_history (sign, key));
86 /* Display the current state of the search in the echo-area.
87 SEARCH_STRING contains the string that is being searched for,
88 DIRECTION is zero for forward, or 1 for reverse,
89 WHERE is the history list number of the current line. If it is
90 -1, then this line is the starting one. */
92 rl_display_search (search_string, reverse_p, where)
97 int msglen, searchlen;
99 searchlen = (search_string && *search_string) ? strlen (search_string) : 0;
101 message = xmalloc (searchlen + 33);
107 sprintf (message, "[%d]", where + history_base);
108 msglen = strlen (message);
112 message[msglen++] = '(';
116 strcpy (message + msglen, "reverse-");
120 strcpy (message + msglen, "i-search)`");
125 strcpy (message + msglen, search_string);
129 strcpy (message + msglen, "': ");
131 rl_message ("%s", message, 0);
133 (*rl_redisplay_function) ();
136 /* Search through the history looking for an interactively typed string.
137 This is analogous to i-search. We start the search in the current line.
138 DIRECTION is which direction to search; >= 0 means forward, < 0 means
141 rl_search_history (direction, invoking_key)
142 int direction, invoking_key;
144 /* The string that the user types in to search for. */
147 /* The current length of SEARCH_STRING. */
148 int search_string_index;
150 /* The amount of space that SEARCH_STRING has allocated to it. */
151 int search_string_size;
153 /* The list of lines to search through. */
154 char **lines, *allocated_line;
156 /* The length of LINES. */
159 /* Where we get LINES from. */
163 int orig_point, orig_line, last_found_line;
164 int c, found, failed, sline_len;
166 /* The line currently being searched. */
169 /* Offset in that line. */
172 /* Non-zero if we are doing a reverse search. */
175 orig_point = rl_point;
176 last_found_line = orig_line = where_history ();
177 reverse = direction < 0;
178 hlist = history_list ();
179 allocated_line = (char *)NULL;
181 /* Create an arrary of pointers to the lines that we want to search. */
182 maybe_replace_line ();
185 for (i = 0; hlist[i]; i++);
187 /* Allocate space for this many lines, +1 for the current input line,
188 and remember those lines. */
189 lines = (char **)xmalloc ((1 + (hlen = i)) * sizeof (char *));
190 for (i = 0; i < hlen; i++)
191 lines[i] = hlist[i]->line;
193 if (saved_line_for_history)
194 lines[i] = saved_line_for_history->line;
197 /* Keep track of this so we can free it. */
198 allocated_line = xmalloc (1 + strlen (rl_line_buffer));
199 strcpy (allocated_line, &rl_line_buffer[0]);
200 lines[i] = allocated_line;
205 /* The line where we start the search. */
210 /* Initialize search parameters. */
211 search_string = xmalloc (search_string_size = 128);
212 *search_string = '\0';
213 search_string_index = 0;
214 prev_line_found = (char *)0; /* XXX */
216 /* Normalize DIRECTION into 1 or -1. */
217 direction = (direction >= 0) ? 1 : -1;
219 rl_display_search (search_string, reverse, -1);
221 sline = rl_line_buffer;
222 sline_len = strlen (sline);
223 line_index = rl_point;
228 Function *f = (Function *)NULL;
230 /* Read a key and decide how to proceed. */
233 if (_rl_keymap[c].type == ISFUNC)
235 f = _rl_keymap[c].function;
237 if (f == rl_reverse_search_history)
238 c = reverse ? -1 : -2;
239 else if (f == rl_forward_search_history)
240 c = !reverse ? -1 : -2;
243 /* Let NEWLINE (^J) terminate the search for people who don't like
244 using ESC. ^M can still be used to terminate the search and
245 immediately execute the command. */
246 if (c == ESC || c == NEWLINE)
248 /* ESC still terminates the search, but if there is pending
249 input or if input arrives within 0.1 seconds (on systems
250 with select(2)) it is used as a prefix character
251 with rl_execute_next. WATCH OUT FOR THIS! This is intended
252 to allow the arrow keys to be used like ^F and ^B are used
253 to terminate the search and execute the movement command. */
254 if (c == ESC && _rl_input_available ()) /* XXX */
255 rl_execute_next (ESC);
259 if (c >= 0 && (CTRL_CHAR (c) || META_CHAR (c) || c == RUBOUT))
268 if (search_string_index == 0)
272 else if (line_index != sline_len)
278 /* switch directions */
280 direction = -direction;
281 reverse = direction < 0;
285 strcpy (rl_line_buffer, lines[orig_line]);
286 rl_point = orig_point;
287 rl_end = strlen (rl_line_buffer);
288 _rl_restore_prompt();
290 free (allocated_line);
295 /* Add character to search string and continue search. */
296 if (search_string_index + 2 >= search_string_size)
298 search_string_size += 128;
299 search_string = xrealloc (search_string, search_string_size);
301 search_string[search_string_index++] = c;
302 search_string[search_string_index] = '\0';
306 for (found = failed = 0;;)
308 int limit = sline_len - search_string_index + 1;
310 /* Search the current line. */
311 while (reverse ? (line_index >= 0) : (line_index < limit))
313 if (STREQN (search_string, sline + line_index, search_string_index))
319 line_index += direction;
324 /* Move to the next line, but skip new copies of the line
325 we just found and lines shorter than the string we're
329 /* Move to the next line. */
332 /* At limit for direction? */
333 if (reverse ? (i < 0) : (i == hlen))
339 /* We will need these later. */
341 sline_len = strlen (sline);
343 while ((prev_line_found && STREQ (prev_line_found, lines[i])) ||
344 (search_string_index > sline_len));
349 /* Now set up the line for searching... */
350 line_index = reverse ? sline_len - search_string_index : 0;
355 /* We cannot find the search string. Ding the bell. */
358 continue; /* XXX - was break */
361 /* We have found the search string. Just display it. But don't
362 actually move there in the history list until the user accepts
368 prev_line_found = lines[i];
369 line_len = strlen (lines[i]);
371 if (line_len >= rl_line_buffer_len)
372 rl_extend_line_buffer (line_len);
374 strcpy (rl_line_buffer, lines[i]);
375 rl_point = line_index;
378 rl_display_search (search_string, reverse, (i == orig_line) ? -1 : i);
382 /* The searching is over. The user may have found the string that she
383 was looking for, or else she may have exited a failing search. If
384 LINE_INDEX is -1, then that shows that the string searched for was
385 not found. We use this to determine where to place rl_point. */
387 /* First put back the original state. */
388 strcpy (rl_line_buffer, lines[orig_line]);
390 _rl_restore_prompt ();
392 /* Free the search string. */
393 free (search_string);
395 if (last_found_line < orig_line)
396 rl_get_previous_history (orig_line - last_found_line);
398 rl_get_next_history (last_found_line - orig_line);
400 /* If the string was not found, put point at the end of the line. */
402 line_index = strlen (rl_line_buffer);
403 rl_point = line_index;
406 free (allocated_line);