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-rw-r--r--readline/isearch.c433
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diff --git a/readline/isearch.c b/readline/isearch.c
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+/* **************************************************************** */
+/* */
+/* 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. */
+#define READLINE_LIBRARY
+
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#include <stdio.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+
+#if defined (HAVE_STDLIB_H)
+# include <stdlib.h>
+#else
+# include "ansi_stdlib.h"
+#endif
+
+#include "rldefs.h"
+#include "readline.h"
+#include "history.h"
+
+/* Variables imported from other files in the readline library. */
+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_line_buffer;
+
+extern void _rl_save_prompt ();
+extern void _rl_restore_prompt ();
+
+extern int rl_execute_next ();
+extern void rl_extend_line_buffer ();
+
+extern int _rl_input_available ();
+
+extern char *xmalloc (), *xrealloc ();
+
+static int rl_search_history ();
+
+/* Last line found by the current incremental search, so we don't `find'
+ identical lines many times in a row. */
+static char *prev_line_found;
+
+/* Search backwards through the history looking for a string which is typed
+ interactively. Start with the current line. */
+int
+rl_reverse_search_history (sign, key)
+ int sign, key;
+{
+ return (rl_search_history (-sign, key));
+}
+
+/* Search forwards through the history looking for a string which is typed
+ interactively. Start with the current line. */
+int
+rl_forward_search_history (sign, key)
+ int sign, key;
+{
+ return (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;
+ int msglen, searchlen;
+
+ searchlen = (search_string && *search_string) ? strlen (search_string) : 0;
+
+ message = xmalloc (searchlen + 33);
+ msglen = 0;
+
+#if defined (NOTDEF)
+ if (where != -1)
+ {
+ sprintf (message, "[%d]", where + history_base);
+ msglen = strlen (message);
+ }
+#endif /* NOTDEF */
+
+ message[msglen++] = '(';
+
+ if (reverse_p)
+ {
+ strcpy (message + msglen, "reverse-");
+ msglen += 8;
+ }
+
+ strcpy (message + msglen, "i-search)`");
+ msglen += 10;
+
+ if (search_string)
+ {
+ strcpy (message + msglen, search_string);
+ msglen += searchlen;
+ }
+
+ strcpy (message + msglen, "': ");
+
+ rl_message ("%s", message, 0);
+ free (message);
+ (*rl_redisplay_function) ();
+}
+
+/* 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 int
+rl_search_history (direction, invoking_key)
+ int direction, 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, *allocated_line;
+
+ /* The length of LINES. */
+ int hlen;
+
+ /* Where we get LINES from. */
+ HIST_ENTRY **hlist;
+
+ register int i;
+ int orig_point, orig_line, last_found_line;
+ int c, found, failed, sline_len;
+
+ /* The line currently being searched. */
+ char *sline;
+
+ /* Offset in that line. */
+ int line_index;
+
+ /* Non-zero if we are doing a reverse search. */
+ int reverse;
+
+ orig_point = rl_point;
+ last_found_line = orig_line = where_history ();
+ reverse = direction < 0;
+ hlist = history_list ();
+ allocated_line = (char *)NULL;
+
+ /* Create an arrary of pointers to the lines that we want to search. */
+ maybe_replace_line ();
+ i = 0;
+ 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 **)xmalloc ((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
+ {
+ /* Keep track of this so we can free it. */
+ allocated_line = xmalloc (1 + strlen (rl_line_buffer));
+ strcpy (allocated_line, &rl_line_buffer[0]);
+ lines[i] = allocated_line;
+ }
+
+ hlen++;
+
+ /* The line where we start the search. */
+ i = orig_line;
+
+ _rl_save_prompt ();
+
+ /* Initialize search parameters. */
+ search_string = xmalloc (search_string_size = 128);
+ *search_string = '\0';
+ search_string_index = 0;
+ prev_line_found = (char *)0; /* XXX */
+
+ /* Normalize DIRECTION into 1 or -1. */
+ direction = (direction >= 0) ? 1 : -1;
+
+ rl_display_search (search_string, reverse, -1);
+
+ sline = rl_line_buffer;
+ sline_len = strlen (sline);
+ line_index = rl_point;
+
+ found = failed = 0;
+ for (;;)
+ {
+ Function *f = (Function *)NULL;
+
+ /* Read a key and decide how to proceed. */
+ c = rl_read_key ();
+
+ 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;
+ }
+
+ /* Let NEWLINE (^J) terminate the search for people who don't like
+ using ESC. ^M can still be used to terminate the search and
+ immediately execute the command. */
+ if (c == ESC || c == NEWLINE)
+ {
+ /* ESC still terminates the search, but if there is pending
+ input or if input arrives within 0.1 seconds (on systems
+ with select(2)) it is used as a prefix character
+ with rl_execute_next. WATCH OUT FOR THIS! This is intended
+ to allow the arrow keys to be used like ^F and ^B are used
+ to terminate the search and execute the movement command. */
+ if (c == ESC && _rl_input_available ()) /* XXX */
+ rl_execute_next (ESC);
+ break;
+ }
+
+ if (c >= 0 && (CTRL_CHAR (c) || META_CHAR (c) || c == RUBOUT) && c != CTRL ('G'))
+ {
+ rl_execute_next (c);
+ break;
+ }
+
+ switch (c)
+ {
+ case -1:
+ if (search_string_index == 0)
+ continue;
+ else if (reverse)
+ --line_index;
+ else if (line_index != sline_len)
+ ++line_index;
+ else
+ ding ();
+ break;
+
+ /* switch directions */
+ case -2:
+ direction = -direction;
+ reverse = direction < 0;
+ break;
+
+ case CTRL ('G'):
+ strcpy (rl_line_buffer, lines[orig_line]);
+ rl_point = orig_point;
+ rl_end = strlen (rl_line_buffer);
+ _rl_restore_prompt();
+ rl_clear_message ();
+ if (allocated_line)
+ free (allocated_line);
+ free (lines);
+ return 0;
+
+#if 0
+ /* delete character from search string. */
+ case -3:
+ if (search_string_index == 0)
+ ding ();
+ else
+ {
+ search_string[--search_string_index] = '\0';
+ /* This is tricky. To do this right, we need to keep a
+ stack of search positions for the current search, with
+ sentinels marking the beginning and end. */
+ }
+ break;
+#endif
+
+ default:
+ /* Add character to search string and continue search. */
+ if (search_string_index + 2 >= search_string_size)
+ {
+ search_string_size += 128;
+ search_string = xrealloc (search_string, search_string_size);
+ }
+ search_string[search_string_index++] = c;
+ search_string[search_string_index] = '\0';
+ break;
+ }
+
+ for (found = failed = 0;;)
+ {
+ int limit = sline_len - search_string_index + 1;
+
+ /* Search the current line. */
+ while (reverse ? (line_index >= 0) : (line_index < limit))
+ {
+ if (STREQN (search_string, sline + line_index, search_string_index))
+ {
+ found++;
+ break;
+ }
+ else
+ line_index += direction;
+ }
+ if (found)
+ break;
+
+ /* Move to the next line, but skip new copies of the line
+ we just found and lines shorter than the string we're
+ searching for. */
+ do
+ {
+ /* Move to the next line. */
+ i += direction;
+
+ /* At limit for direction? */
+ if (reverse ? (i < 0) : (i == hlen))
+ {
+ failed++;
+ break;
+ }
+
+ /* We will need these later. */
+ sline = lines[i];
+ sline_len = strlen (sline);
+ }
+ while ((prev_line_found && STREQ (prev_line_found, lines[i])) ||
+ (search_string_index > sline_len));
+
+ if (failed)
+ break;
+
+ /* Now set up the line for searching... */
+ line_index = reverse ? sline_len - search_string_index : 0;
+ }
+
+ if (failed)
+ {
+ /* We cannot find the search string. Ding the bell. */
+ ding ();
+ i = last_found_line;
+ continue; /* XXX - was break */
+ }
+
+ /* 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. */
+ if (found)
+ {
+ int line_len;
+
+ prev_line_found = lines[i];
+ 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 = line_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
+ LINE_INDEX is -1, then that shows that the string searched for was
+ not found. We use this to determine where to place rl_point. */
+
+ /* First put back the original state. */
+ strcpy (rl_line_buffer, lines[orig_line]);
+
+ _rl_restore_prompt ();
+
+ /* Free the search string. */
+ free (search_string);
+
+ if (last_found_line < orig_line)
+ rl_get_previous_history (orig_line - last_found_line);
+ else
+ rl_get_next_history (last_found_line - orig_line);
+
+ /* If the string was not found, put point at the end of the line. */
+ if (line_index < 0)
+ line_index = strlen (rl_line_buffer);
+ rl_point = line_index;
+ rl_clear_message ();
+
+ if (allocated_line)
+ free (allocated_line);
+ free (lines);
+
+ return 0;
+}
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