home *** CD-ROM | disk | FTP | other *** search
- /* **************************************************************** */
- /* */
- /* I-Search and Searching */
- /* */
- /* **************************************************************** */
-
- /* Copyright (C) 1987,1989 Free Software Foundation, Inc.
-
- This file contains the Readline Library (the Library), a set of
- routines for providing Emacs style line input to programs that ask
- for it.
-
- The Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- The Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- The GNU General Public License is often shipped with GNU software, and
- is generally kept in a file called COPYING or LICENSE. If you do not
- have a copy of the license, write to the Free Software Foundation,
- 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* For alloca on AIX. CYGNUS LOCAL. */
- #include "sysdep.h"
-
- #include <stdio.h>
-
- #if defined (__GNUC__)
- # define alloca __builtin_alloca
- #else
- # if defined (sparc) || defined (HAVE_ALLOCA_H)
- # include <alloca.h>
- # endif
- #endif
-
- #include "readline.h"
- #include "history.h"
-
- extern Keymap _rl_keymap;
- extern HIST_ENTRY *saved_line_for_history;
- extern int rl_line_buffer_len;
- extern int rl_point, rl_end;
- extern char *rl_prompt, *rl_line_buffer;
-
- /* Remove these declarations when we have a complete libgnu.a. */
- extern char *xmalloc (), *xrealloc ();
-
- static void rl_search_history ();
-
- /* Search backwards through the history looking for a string which is typed
- interactively. Start with the current line. */
- rl_reverse_search_history (sign, key)
- int sign;
- int key;
- {
- rl_search_history (-sign, key);
- }
-
- /* Search forwards through the history looking for a string which is typed
- interactively. Start with the current line. */
- rl_forward_search_history (sign, key)
- int sign;
- int key;
- {
- rl_search_history (sign, key);
- }
-
- /* Display the current state of the search in the echo-area.
- SEARCH_STRING contains the string that is being searched for,
- DIRECTION is zero for forward, or 1 for reverse,
- WHERE is the history list number of the current line. If it is
- -1, then this line is the starting one. */
- static void
- rl_display_search (search_string, reverse_p, where)
- char *search_string;
- int reverse_p, where;
- {
- char *message = (char *)NULL;
-
- message =
- (char *)xmalloc (1 + (search_string ? strlen (search_string) : 0) + 30);
-
- *message = '\0';
-
- #if defined (NOTDEF)
- if (where != -1)
- sprintf (message, "[%d]", where + history_base);
- #endif /* NOTDEF */
-
- strcat (message, "(");
-
- if (reverse_p)
- strcat (message, "reverse-");
-
- strcat (message, "i-search)`");
-
- if (search_string)
- strcat (message, search_string);
-
- strcat (message, "': ");
- rl_message ("%s", message, 0);
- free (message);
- rl_redisplay ();
- }
-
- /* Search through the history looking for an interactively typed string.
- This is analogous to i-search. We start the search in the current line.
- DIRECTION is which direction to search; >= 0 means forward, < 0 means
- backwards. */
- static void
- rl_search_history (direction, invoking_key)
- int direction;
- int invoking_key;
- {
- /* The string that the user types in to search for. */
- char *search_string;
-
- /* The current length of SEARCH_STRING. */
- int search_string_index;
-
- /* The amount of space that SEARCH_STRING has allocated to it. */
- int search_string_size;
-
- /* The list of lines to search through. */
- char **lines;
-
- /* The length of LINES. */
- int hlen;
-
- /* Where we get LINES from. */
- HIST_ENTRY **hlist = history_list ();
-
- register int i = 0;
- int orig_point = rl_point;
- int orig_line = where_history ();
- int last_found_line = orig_line;
- int c, done = 0;
-
- /* The line currently being searched. */
- char *sline;
-
- /* Offset in that line. */
- int index;
-
- /* Non-zero if we are doing a reverse search. */
- int reverse = (direction < 0);
-
- /* Create an arrary of pointers to the lines that we want to search. */
- maybe_replace_line ();
- if (hlist)
- for (i = 0; hlist[i]; i++);
-
- /* Allocate space for this many lines, +1 for the current input line,
- and remember those lines. */
- lines = (char **)alloca ((1 + (hlen = i)) * sizeof (char *));
- for (i = 0; i < hlen; i++)
- lines[i] = hlist[i]->line;
-
- if (saved_line_for_history)
- lines[i] = saved_line_for_history->line;
- else
- /* So I have to type it in this way instead. */
- {
- char *alloced_line;
-
- /* Keep that MIPS alloca () happy. */
- alloced_line = (char *)alloca (1 + strlen (rl_line_buffer));
- lines[i] = alloced_line;
- strcpy (lines[i], &rl_line_buffer[0]);
- }
-
- hlen++;
-
- /* The line where we start the search. */
- i = orig_line;
-
- /* Initialize search parameters. */
- search_string = (char *)xmalloc (search_string_size = 128);
- *search_string = '\0';
- search_string_index = 0;
-
- /* Normalize DIRECTION into 1 or -1. */
- if (direction >= 0)
- direction = 1;
- else
- direction = -1;
-
- rl_display_search (search_string, reverse, -1);
-
- sline = rl_line_buffer;
- index = rl_point;
-
- while (!done)
- {
- c = rl_read_key ();
-
- /* Hack C to Do What I Mean. */
- {
- Function *f = (Function *)NULL;
-
- if (_rl_keymap[c].type == ISFUNC)
- {
- f = _rl_keymap[c].function;
-
- if (f == rl_reverse_search_history)
- c = reverse ? -1 : -2;
- else if (f == rl_forward_search_history)
- c = !reverse ? -1 : -2;
- }
- }
-
- switch (c)
- {
- case ESC:
- done = 1;
- continue;
-
- /* case invoking_key: */
- case -1:
- goto search_again;
-
- /* switch directions */
- case -2:
- direction = -direction;
- reverse = (direction < 0);
-
- goto do_search;
-
- case CTRL ('G'):
- strcpy (rl_line_buffer, lines[orig_line]);
- rl_point = orig_point;
- rl_end = strlen (rl_line_buffer);
- rl_clear_message ();
- return;
-
- default:
- if (c < 32 || c > 126)
- {
- rl_execute_next (c);
- done = 1;
- continue;
- }
- else
- {
- if (search_string_index + 2 >= search_string_size)
- search_string = (char *)xrealloc
- (search_string, (search_string_size += 128));
- search_string[search_string_index++] = c;
- search_string[search_string_index] = '\0';
- goto do_search;
-
- search_again:
-
- if (!search_string_index)
- continue;
- else
- {
- if (reverse)
- --index;
- else
- if (index != strlen (sline))
- ++index;
- else
- ding ();
- }
- do_search:
-
- while (1)
- {
- if (reverse)
- {
- while (index >= 0)
- if (strncmp
- (search_string, sline + index, search_string_index)
- == 0)
- goto string_found;
- else
- index--;
- }
- else
- {
- register int limit =
- (strlen (sline) - search_string_index) + 1;
-
- while (index < limit)
- {
- if (strncmp (search_string,
- sline + index,
- search_string_index) == 0)
- goto string_found;
- index++;
- }
- }
-
- next_line:
- i += direction;
-
- /* At limit for direction? */
- if ((reverse && i < 0) ||
- (!reverse && i == hlen))
- goto search_failed;
-
- sline = lines[i];
- if (reverse)
- index = strlen (sline);
- else
- index = 0;
-
- /* If the search string is longer than the current
- line, no match. */
- if (search_string_index > (int)strlen (sline))
- goto next_line;
-
- /* Start actually searching. */
- if (reverse)
- index -= search_string_index;
- }
-
- search_failed:
- /* We cannot find the search string. Ding the bell. */
- ding ();
- i = last_found_line;
- break;
-
- string_found:
- /* We have found the search string. Just display it. But don't
- actually move there in the history list until the user accepts
- the location. */
- {
- int line_len;
-
- line_len = strlen (lines[i]);
-
- if (line_len >= rl_line_buffer_len)
- rl_extend_line_buffer (line_len);
-
- strcpy (rl_line_buffer, lines[i]);
- rl_point = index;
- rl_end = line_len;
- last_found_line = i;
- rl_display_search
- (search_string, reverse, (i == orig_line) ? -1 : i);
- }
- }
- }
- }
-
- /* The searching is over. The user may have found the string that she
- was looking for, or else she may have exited a failing search. If
- INDEX is -1, then that shows that the string searched for was not
- found. We use this to determine where to place rl_point. */
- {
- int now = last_found_line;
-
- /* First put back the original state. */
- strcpy (rl_line_buffer, lines[orig_line]);
-
- /* Free the search string. */
- free (search_string);
-
- if (now < orig_line)
- rl_get_previous_history (orig_line - now);
- else
- rl_get_next_history (now - orig_line);
-
- /* If the index of the "matched" string is less than zero, then the
- final search string was never matched, so put point somewhere
- reasonable. */
- if (index < 0)
- index = strlen (rl_line_buffer);
-
- rl_point = index;
- rl_clear_message ();
- }
- }
-