binutils-gdb/readline/search.c

378 lines
9.0 KiB
C

/* search.c - code for non-incremental searching in emacs and vi modes. */
/* Copyright (C) 1992 Free Software Foundation, Inc.
This file is part of 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"
#ifdef abs
# undef abs
#endif
#define abs(x) (((x) >= 0) ? (x) : -(x))
extern char *xmalloc (), *xrealloc ();
/* Variables imported from readline.c */
extern int rl_point, rl_end, rl_line_buffer_len;
extern int rl_editing_mode;
extern char *rl_prompt;
extern char *rl_line_buffer;
extern HIST_ENTRY *saved_line_for_history;
extern Function *rl_last_func;
/* Functions imported from the rest of the library. */
extern int _rl_free_history_entry ();
extern char *_rl_make_prompt_for_search ();
extern void rl_extend_line_buffer ();
static char *noninc_search_string = (char *) NULL;
static int noninc_history_pos;
static char *prev_line_found = (char *) NULL;
/* Search the history list for STRING starting at absolute history position
POS. If STRING begins with `^', the search must match STRING at the
beginning of a history line, otherwise a full substring match is performed
for STRING. DIR < 0 means to search backwards through the history list,
DIR >= 0 means to search forward. */
static int
noninc_search_from_pos (string, pos, dir)
char *string;
int pos, dir;
{
int ret, old;
old = where_history ();
history_set_pos (pos);
if (*string == '^')
ret = history_search_prefix (string + 1, dir);
else
ret = history_search (string, dir);
if (ret != -1)
ret = where_history ();
history_set_pos (old);
return (ret);
}
/* Search for a line in the history containing STRING. If DIR is < 0, the
search is backwards through previous entries, else through subsequent
entries. */
static void
noninc_dosearch (string, dir)
char *string;
int dir;
{
int oldpos, pos, line_len;
HIST_ENTRY *entry;
if (string == 0 || *string == '\0' || noninc_history_pos < 0)
{
ding ();
return;
}
pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir);
if (pos == -1)
{
/* Search failed, current history position unchanged. */
maybe_unsave_line ();
rl_clear_message ();
rl_point = 0;
ding ();
return;
}
noninc_history_pos = pos;
oldpos = where_history ();
history_set_pos (noninc_history_pos);
entry = current_history ();
#if defined (VI_MODE)
if (rl_editing_mode != vi_mode)
#endif
history_set_pos (oldpos);
line_len = strlen (entry->line);
if (line_len >= rl_line_buffer_len)
rl_extend_line_buffer (line_len);
strcpy (rl_line_buffer, entry->line);
rl_undo_list = (UNDO_LIST *)entry->data;
rl_end = strlen (rl_line_buffer);
rl_point = 0;
rl_clear_message ();
if (saved_line_for_history)
_rl_free_history_entry (saved_line_for_history);
saved_line_for_history = (HIST_ENTRY *)NULL;
}
/* Search non-interactively through the history list. DIR < 0 means to
search backwards through the history of previous commands; otherwise
the search is for commands subsequent to the current position in the
history list. PCHAR is the character to use for prompting when reading
the search string; if not specified (0), it defaults to `:'. */
static void
noninc_search (dir, pchar)
int dir;
int pchar;
{
int saved_point, c;
char *p;
maybe_save_line ();
saved_point = rl_point;
/* Use the line buffer to read the search string. */
rl_line_buffer[0] = 0;
rl_end = rl_point = 0;
p = _rl_make_prompt_for_search (pchar ? pchar : ':');
rl_message (p, 0, 0);
free (p);
#define SEARCH_RETURN rl_restore_prompt (); return
/* Read the search string. */
while (c = rl_read_key ())
{
switch (c)
{
case CTRL('H'):
case RUBOUT:
if (rl_point == 0)
{
maybe_unsave_line ();
rl_clear_message ();
rl_point = saved_point;
SEARCH_RETURN;
}
rl_rubout (1, c);
break;
case CTRL('W'):
rl_unix_word_rubout (1, c);
break;
case CTRL('U'):
rl_unix_line_discard (1, c);
break;
case RETURN:
case NEWLINE:
goto dosearch;
/* NOTREACHED */
break;
case CTRL('C'):
case CTRL('G'):
maybe_unsave_line ();
rl_clear_message ();
rl_point = saved_point;
ding ();
SEARCH_RETURN;
default:
rl_insert (1, c);
break;
}
(*rl_redisplay_function) ();
}
dosearch:
/* If rl_point == 0, we want to re-use the previous search string and
start from the saved history position. If there's no previous search
string, punt. */
if (rl_point == 0)
{
if (!noninc_search_string)
{
ding ();
SEARCH_RETURN;
}
}
else
{
/* We want to start the search from the current history position. */
noninc_history_pos = where_history ();
if (noninc_search_string)
free (noninc_search_string);
noninc_search_string = savestring (rl_line_buffer);
}
rl_restore_prompt ();
noninc_dosearch (noninc_search_string, dir);
}
/* Search forward through the history list for a string. If the vi-mode
code calls this, KEY will be `?'. */
int
rl_noninc_forward_search (count, key)
int count, key;
{
noninc_search (1, (key == '?') ? '?' : 0);
return 0;
}
/* Reverse search the history list for a string. If the vi-mode code
calls this, KEY will be `/'. */
int
rl_noninc_reverse_search (count, key)
int count, key;
{
noninc_search (-1, (key == '/') ? '/' : 0);
return 0;
}
/* Search forward through the history list for the last string searched
for. If there is no saved search string, abort. */
int
rl_noninc_forward_search_again (count, key)
int count, key;
{
if (!noninc_search_string)
{
ding ();
return (-1);
}
noninc_dosearch (noninc_search_string, 1);
return 0;
}
/* Reverse search in the history list for the last string searched
for. If there is no saved search string, abort. */
int
rl_noninc_reverse_search_again (count, key)
int count, key;
{
if (!noninc_search_string)
{
ding ();
return (-1);
}
noninc_dosearch (noninc_search_string, -1);
return 0;
}
static int
rl_history_search_internal (count, direction)
int count, direction;
{
HIST_ENTRY *temp, *old_temp;
int line_len;
maybe_save_line ();
temp = old_temp = (HIST_ENTRY *)NULL;
while (count)
{
temp = (direction < 0) ? previous_history () : next_history ();
if (temp == 0)
break;
/* On an empty prefix, make this the same as previous-history. */
if (rl_point == 0)
{
count--;
continue;
}
if (STREQN (rl_line_buffer, temp->line, rl_point))
{
/* Don't find multiple instances of the same line. */
if (prev_line_found && STREQ (prev_line_found, temp->line))
continue;
if (direction < 0)
old_temp = temp;
prev_line_found = temp->line;
count--;
}
}
if (temp == 0)
{
if (direction < 0 && old_temp)
temp = old_temp;
else
{
maybe_unsave_line ();
ding ();
return 1;
}
}
line_len = strlen (temp->line);
if (line_len >= rl_line_buffer_len)
rl_extend_line_buffer (line_len);
strcpy (rl_line_buffer, temp->line);
rl_undo_list = (UNDO_LIST *)temp->data;
rl_end = line_len;
return 0;
}
/* Search forward in the history for the string of characters
from the start of the line to rl_point. This is a non-incremental
search. */
int
rl_history_search_forward (count, ignore)
int count, ignore;
{
if (count == 0)
return (0);
if (rl_last_func != rl_history_search_forward)
prev_line_found = (char *)NULL;
return (rl_history_search_internal (abs (count), (count > 0) ? 1 : -1));
}
/* Search backward through the history for the string of characters
from the start of the line to rl_point. This is a non-incremental
search. */
int
rl_history_search_backward (count, ignore)
int count, ignore;
{
if (count == 0)
return (0);
if (rl_last_func != rl_history_search_backward)
prev_line_found = (char *)NULL;
return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1));
}