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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. */
/* 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 ();
}
}
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