--- /dev/null
+/* search.c - code for non-incremental searching in emacs and vi modes. */
+
+/* Copyright (C) 1992-2017 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library (Readline), a library
+ for reading lines of text with interactive input and history editing.
+
+ Readline 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 3 of the License, or
+ (at your option) any later version.
+
+ Readline 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.
+
+ You should have received a copy of the GNU General Public License
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#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 "rlmbutil.h"
+
+#include "readline.h"
+#include "history.h"
+#include "histlib.h"
+
+#include "rlprivate.h"
+#include "xmalloc.h"
+
+#ifdef abs
+# undef abs
+#endif
+#define abs(x) (((x) >= 0) ? (x) : -(x))
+
+_rl_search_cxt *_rl_nscxt = 0;
+
+extern HIST_ENTRY *_rl_saved_line_for_history;
+
+/* Functions imported from the rest of the library. */
+extern void _rl_free_history_entry PARAMS((HIST_ENTRY *));
+
+static char *noninc_search_string = (char *) NULL;
+static int noninc_history_pos;
+
+static char *prev_line_found = (char *) NULL;
+
+static int rl_history_search_len;
+static int rl_history_search_pos;
+static int rl_history_search_flags;
+
+static char *history_search_string;
+static int history_string_size;
+
+static void make_history_line_current PARAMS((HIST_ENTRY *));
+static int noninc_search_from_pos PARAMS((char *, int, int, int, int *));
+static int noninc_dosearch PARAMS((char *, int, int));
+static int noninc_search PARAMS((int, int));
+static int rl_history_search_internal PARAMS((int, int));
+static void rl_history_search_reinit PARAMS((int));
+
+static _rl_search_cxt *_rl_nsearch_init PARAMS((int, int));
+static void _rl_nsearch_abort PARAMS((_rl_search_cxt *));
+static int _rl_nsearch_dispatch PARAMS((_rl_search_cxt *, int));
+
+/* Make the data from the history entry ENTRY be the contents of the
+ current line. This doesn't do anything with rl_point; the caller
+ must set it. */
+static void
+make_history_line_current (HIST_ENTRY *entry)
+{
+ _rl_replace_text (entry->line, 0, rl_end);
+ _rl_fix_point (1);
+#if defined (VI_MODE)
+ if (rl_editing_mode == vi_mode)
+ /* POSIX.2 says that the `U' command doesn't affect the copy of any
+ command lines to the edit line. We're going to implement that by
+ making the undo list start after the matching line is copied to the
+ current editing buffer. */
+ rl_free_undo_list ();
+#endif
+
+ if (_rl_saved_line_for_history)
+ _rl_free_history_entry (_rl_saved_line_for_history);
+ _rl_saved_line_for_history = (HIST_ENTRY *)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 (char *string, int pos, int dir, int flags, int *ncp)
+{
+ int ret, old, sflags;
+ char *s;
+
+ if (pos < 0)
+ return -1;
+
+ old = where_history ();
+ if (history_set_pos (pos) == 0)
+ return -1;
+
+ RL_SETSTATE(RL_STATE_SEARCH);
+ /* These functions return the match offset in the line; history_offset gives
+ the matching line in the history list */
+ if (flags & SF_PATTERN)
+ {
+ s = string;
+ sflags = 0; /* Non-anchored search */
+ if (*s == '^')
+ {
+ sflags |= ANCHORED_SEARCH;
+ s++;
+ }
+ ret = _hs_history_patsearch (s, dir, sflags);
+ }
+ else if (*string == '^')
+ ret = history_search_prefix (string + 1, dir);
+ else
+ ret = history_search (string, dir);
+ RL_UNSETSTATE(RL_STATE_SEARCH);
+
+ if (ncp)
+ *ncp = ret; /* caller will catch -1 to indicate no-op */
+
+ 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. Returns 1 if the search was successful, 0 otherwise. */
+static int
+noninc_dosearch (char *string, int dir, int flags)
+{
+ int oldpos, pos;
+ HIST_ENTRY *entry;
+
+ if (string == 0 || *string == '\0' || noninc_history_pos < 0)
+ {
+ rl_ding ();
+ return 0;
+ }
+
+ pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir, flags, (int *)0);
+ if (pos == -1)
+ {
+ /* Search failed, current history position unchanged. */
+ rl_maybe_unsave_line ();
+ rl_clear_message ();
+ rl_point = 0;
+ rl_ding ();
+ return 0;
+ }
+
+ noninc_history_pos = pos;
+
+ oldpos = where_history ();
+ history_set_pos (noninc_history_pos);
+ entry = current_history (); /* will never be NULL after successful search */
+
+#if defined (VI_MODE)
+ if (rl_editing_mode != vi_mode)
+#endif
+ history_set_pos (oldpos);
+
+ make_history_line_current (entry);
+
+ rl_point = 0;
+ rl_mark = rl_end;
+
+ rl_clear_message ();
+ return 1;
+}
+
+static _rl_search_cxt *
+_rl_nsearch_init (int dir, int pchar)
+{
+ _rl_search_cxt *cxt;
+ char *p;
+
+ cxt = _rl_scxt_alloc (RL_SEARCH_NSEARCH, 0);
+ if (dir < 0)
+ cxt->sflags |= SF_REVERSE; /* not strictly needed */
+#if defined (VI_MODE)
+ if (VI_COMMAND_MODE() && (pchar == '?' || pchar == '/'))
+ cxt->sflags |= SF_PATTERN;
+#endif
+
+ cxt->direction = dir;
+ cxt->history_pos = cxt->save_line;
+
+ rl_maybe_save_line ();
+
+ /* Clear the undo list, since reading the search string should create its
+ own undo list, and the whole list will end up being freed when we
+ finish reading the search string. */
+ rl_undo_list = 0;
+
+ /* 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 ("%s", p);
+ xfree (p);
+
+ RL_SETSTATE(RL_STATE_NSEARCH);
+
+ _rl_nscxt = cxt;
+
+ return cxt;
+}
+
+int
+_rl_nsearch_cleanup (_rl_search_cxt *cxt, int r)
+{
+ _rl_scxt_dispose (cxt, 0);
+ _rl_nscxt = 0;
+
+ RL_UNSETSTATE(RL_STATE_NSEARCH);
+
+ return (r != 1);
+}
+
+static void
+_rl_nsearch_abort (_rl_search_cxt *cxt)
+{
+ rl_maybe_unsave_line ();
+ rl_clear_message ();
+ rl_point = cxt->save_point;
+ rl_mark = cxt->save_mark;
+ rl_restore_prompt ();
+
+ RL_UNSETSTATE (RL_STATE_NSEARCH);
+}
+
+/* Process just-read character C according to search context CXT. Return -1
+ if the caller should abort the search, 0 if we should break out of the
+ loop, and 1 if we should continue to read characters. */
+static int
+_rl_nsearch_dispatch (_rl_search_cxt *cxt, int c)
+{
+ if (c < 0)
+ c = CTRL ('C');
+
+ switch (c)
+ {
+ case CTRL('W'):
+ rl_unix_word_rubout (1, c);
+ break;
+
+ case CTRL('U'):
+ rl_unix_line_discard (1, c);
+ break;
+
+ case RETURN:
+ case NEWLINE:
+ return 0;
+
+ case CTRL('H'):
+ case RUBOUT:
+ if (rl_point == 0)
+ {
+ _rl_nsearch_abort (cxt);
+ return -1;
+ }
+ _rl_rubout_char (1, c);
+ break;
+
+ case CTRL('C'):
+ case CTRL('G'):
+ rl_ding ();
+ _rl_nsearch_abort (cxt);
+ return -1;
+
+ default:
+#if defined (HANDLE_MULTIBYTE)
+ if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
+ rl_insert_text (cxt->mb);
+ else
+#endif
+ _rl_insert_char (1, c);
+ break;
+ }
+
+ (*rl_redisplay_function) ();
+ return 1;
+}
+
+/* Perform one search according to CXT, using NONINC_SEARCH_STRING. Return
+ -1 if the search should be aborted, any other value means to clean up
+ using _rl_nsearch_cleanup (). Returns 1 if the search was successful,
+ 0 otherwise. */
+static int
+_rl_nsearch_dosearch (_rl_search_cxt *cxt)
+{
+ rl_mark = cxt->save_mark;
+
+ /* 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 == 0)
+ {
+ rl_ding ();
+ rl_restore_prompt ();
+ RL_UNSETSTATE (RL_STATE_NSEARCH);
+ return -1;
+ }
+ }
+ else
+ {
+ /* We want to start the search from the current history position. */
+ noninc_history_pos = cxt->save_line;
+ FREE (noninc_search_string);
+ noninc_search_string = savestring (rl_line_buffer);
+
+ /* If we don't want the subsequent undo list generated by the search
+ matching a history line to include the contents of the search string,
+ we need to clear rl_line_buffer here. For now, we just clear the
+ undo list generated by reading the search string. (If the search
+ fails, the old undo list will be restored by rl_maybe_unsave_line.) */
+ rl_free_undo_list ();
+ }
+
+ rl_restore_prompt ();
+ return (noninc_dosearch (noninc_search_string, cxt->direction, cxt->sflags&SF_PATTERN));
+}
+
+/* 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 int
+noninc_search (int dir, int pchar)
+{
+ _rl_search_cxt *cxt;
+ int c, r;
+
+ cxt = _rl_nsearch_init (dir, pchar);
+
+ if (RL_ISSTATE (RL_STATE_CALLBACK))
+ return (0);
+
+ /* Read the search string. */
+ r = 0;
+ while (1)
+ {
+ c = _rl_search_getchar (cxt);
+
+ if (c < 0)
+ {
+ _rl_nsearch_abort (cxt);
+ return 1;
+ }
+
+ if (c == 0)
+ break;
+
+ r = _rl_nsearch_dispatch (cxt, c);
+ if (r < 0)
+ return 1;
+ else if (r == 0)
+ break;
+ }
+
+ r = _rl_nsearch_dosearch (cxt);
+ return ((r >= 0) ? _rl_nsearch_cleanup (cxt, r) : (r != 1));
+}
+
+/* Search forward through the history list for a string. If the vi-mode
+ code calls this, KEY will be `?'. */
+int
+rl_noninc_forward_search (int count, int key)
+{
+ return noninc_search (1, (key == '?') ? '?' : 0);
+}
+
+/* Reverse search the history list for a string. If the vi-mode code
+ calls this, KEY will be `/'. */
+int
+rl_noninc_reverse_search (int count, int key)
+{
+ return noninc_search (-1, (key == '/') ? '/' : 0);
+}
+
+/* Search forward through the history list for the last string searched
+ for. If there is no saved search string, abort. If the vi-mode code
+ calls this, KEY will be `N'. */
+int
+rl_noninc_forward_search_again (int count, int key)
+{
+ int r;
+
+ if (!noninc_search_string)
+ {
+ rl_ding ();
+ return (1);
+ }
+#if defined (VI_MODE)
+ if (VI_COMMAND_MODE() && key == 'N')
+ r = noninc_dosearch (noninc_search_string, 1, SF_PATTERN);
+ else
+#endif
+ r = noninc_dosearch (noninc_search_string, 1, 0);
+ return (r != 1);
+}
+
+/* Reverse search in the history list for the last string searched
+ for. If there is no saved search string, abort. If the vi-mode code
+ calls this, KEY will be `n'. */
+int
+rl_noninc_reverse_search_again (int count, int key)
+{
+ int r;
+
+ if (!noninc_search_string)
+ {
+ rl_ding ();
+ return (1);
+ }
+#if defined (VI_MODE)
+ if (VI_COMMAND_MODE() && key == 'n')
+ r = noninc_dosearch (noninc_search_string, -1, SF_PATTERN);
+ else
+#endif
+ r = noninc_dosearch (noninc_search_string, -1, 0);
+ return (r != 1);
+}
+
+#if defined (READLINE_CALLBACKS)
+int
+_rl_nsearch_callback (_rl_search_cxt *cxt)
+{
+ int c, r;
+
+ c = _rl_search_getchar (cxt);
+ if (c <= 0)
+ {
+ if (c < 0)
+ _rl_nsearch_abort (cxt);
+ return 1;
+ }
+ r = _rl_nsearch_dispatch (cxt, c);
+ if (r != 0)
+ return 1;
+
+ r = _rl_nsearch_dosearch (cxt);
+ return ((r >= 0) ? _rl_nsearch_cleanup (cxt, r) : (r != 1));
+}
+#endif
+
+static int
+rl_history_search_internal (int count, int dir)
+{
+ HIST_ENTRY *temp;
+ int ret, oldpos, newcol;
+ char *t;
+
+ rl_maybe_save_line ();
+ temp = (HIST_ENTRY *)NULL;
+
+ /* Search COUNT times through the history for a line matching
+ history_search_string. If history_search_string[0] == '^', the
+ line must match from the start; otherwise any substring can match.
+ When this loop finishes, TEMP, if non-null, is the history line to
+ copy into the line buffer. */
+ while (count)
+ {
+ RL_CHECK_SIGNALS ();
+ ret = noninc_search_from_pos (history_search_string, rl_history_search_pos + dir, dir, 0, &newcol);
+ if (ret == -1)
+ break;
+
+ /* Get the history entry we found. */
+ rl_history_search_pos = ret;
+ oldpos = where_history ();
+ history_set_pos (rl_history_search_pos);
+ temp = current_history (); /* will never be NULL after successful search */
+ history_set_pos (oldpos);
+
+ /* Don't find multiple instances of the same line. */
+ if (prev_line_found && STREQ (prev_line_found, temp->line))
+ continue;
+ prev_line_found = temp->line;
+ count--;
+ }
+
+ /* If we didn't find anything at all, return. */
+ if (temp == 0)
+ {
+ rl_maybe_unsave_line ();
+ rl_ding ();
+ /* If you don't want the saved history line (last match) to show up
+ in the line buffer after the search fails, change the #if 0 to
+ #if 1 */
+#if 0
+ if (rl_point > rl_history_search_len)
+ {
+ rl_point = rl_end = rl_history_search_len;
+ rl_line_buffer[rl_end] = '\0';
+ rl_mark = 0;
+ }
+#else
+ rl_point = rl_history_search_len; /* rl_maybe_unsave_line changes it */
+ rl_mark = rl_end;
+#endif
+ return 1;
+ }
+
+ /* Copy the line we found into the current line buffer. */
+ make_history_line_current (temp);
+
+ /* decide where to put rl_point -- need to change this for pattern search */
+ if (rl_history_search_flags & ANCHORED_SEARCH)
+ rl_point = rl_history_search_len; /* easy case */
+ else
+ {
+#if 0
+ t = strstr (rl_line_buffer, history_search_string); /* XXX */
+ rl_point = t ? (int)(t - rl_line_buffer) + rl_history_search_len : rl_end;
+#else
+ rl_point = (newcol >= 0) ? newcol : rl_end;
+#endif
+ }
+ rl_mark = rl_end;
+
+ return 0;
+}
+
+static void
+rl_history_search_reinit (int flags)
+{
+ int sind;
+
+ rl_history_search_pos = where_history ();
+ rl_history_search_len = rl_point;
+ rl_history_search_flags = flags;
+
+ prev_line_found = (char *)NULL;
+ if (rl_point)
+ {
+ /* Allocate enough space for anchored and non-anchored searches */
+ if (rl_history_search_len >= history_string_size - 2)
+ {
+ history_string_size = rl_history_search_len + 2;
+ history_search_string = (char *)xrealloc (history_search_string, history_string_size);
+ }
+ sind = 0;
+ if (flags & ANCHORED_SEARCH)
+ history_search_string[sind++] = '^';
+ strncpy (history_search_string + sind, rl_line_buffer, rl_point);
+ history_search_string[rl_point + sind] = '\0';
+ }
+ _rl_free_saved_history_line ();
+}
+
+/* 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. The search is anchored to the beginning of the history line. */
+int
+rl_history_search_forward (int count, int ignore)
+{
+ if (count == 0)
+ return (0);
+
+ if (rl_last_func != rl_history_search_forward &&
+ rl_last_func != rl_history_search_backward)
+ rl_history_search_reinit (ANCHORED_SEARCH);
+
+ if (rl_history_search_len == 0)
+ return (rl_get_next_history (count, ignore));
+ 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 (int count, int ignore)
+{
+ if (count == 0)
+ return (0);
+
+ if (rl_last_func != rl_history_search_forward &&
+ rl_last_func != rl_history_search_backward)
+ rl_history_search_reinit (ANCHORED_SEARCH);
+
+ if (rl_history_search_len == 0)
+ return (rl_get_previous_history (count, ignore));
+ return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1));
+}
+
+/* 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. The search succeeds if the search string is present anywhere
+ in the history line. */
+int
+rl_history_substr_search_forward (int count, int ignore)
+{
+ if (count == 0)
+ return (0);
+
+ if (rl_last_func != rl_history_substr_search_forward &&
+ rl_last_func != rl_history_substr_search_backward)
+ rl_history_search_reinit (NON_ANCHORED_SEARCH);
+
+ if (rl_history_search_len == 0)
+ return (rl_get_next_history (count, ignore));
+ 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_substr_search_backward (int count, int ignore)
+{
+ if (count == 0)
+ return (0);
+
+ if (rl_last_func != rl_history_substr_search_forward &&
+ rl_last_func != rl_history_substr_search_backward)
+ rl_history_search_reinit (NON_ANCHORED_SEARCH);
+
+ if (rl_history_search_len == 0)
+ return (rl_get_previous_history (count, ignore));
+ return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1));
+}
projects / deliverable / binutils-gdb.git / blobdiff