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[/] [openrisc/] [tags/] [gnu-src/] [gdb-7.2/] [gdb-7.2-or32-1.0rc3/] [readline/] [search.c] - Rev 330
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/* search.c - code for non-incremental searching in emacs and vi modes. */ /* Copyright (C) 1992-2005 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 2, 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, 59 Temple Place, Suite 330, Boston, MA 02111 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 "rlmbutil.h" #include "readline.h" #include "history.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 int _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 char *history_search_string; static int history_string_size; static UNDO_LIST *noninc_saved_undo_list; static void make_history_line_current PARAMS((HIST_ENTRY *)); static int noninc_search_from_pos PARAMS((char *, int, int)); static int noninc_dosearch PARAMS((char *, int)); static int noninc_search PARAMS((int, int)); static int rl_history_search_internal PARAMS((int, int)); static void rl_history_search_reinit PARAMS((void)); static _rl_search_cxt *_rl_nsearch_init PARAMS((int, int)); static int _rl_nsearch_cleanup PARAMS((_rl_search_cxt *, 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 (entry) 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 (string, pos, dir) char *string; int pos, dir; { int ret, old; if (pos < 0) return -1; old = where_history (); if (history_set_pos (pos) == 0) return -1; RL_SETSTATE(RL_STATE_SEARCH); if (*string == '^') ret = history_search_prefix (string + 1, dir); else ret = history_search (string, dir); RL_UNSETSTATE(RL_STATE_SEARCH); 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 (string, dir) char *string; int dir; { 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); 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 (); #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 (dir, pchar) int dir, 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 */ 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 (p, 0, 0); free (p); RL_SETSTATE(RL_STATE_NSEARCH); _rl_nscxt = cxt; return cxt; } static int _rl_nsearch_cleanup (cxt, r) _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 (cxt) _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 (cxt, c) _rl_search_cxt *cxt; int 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 (cxt) _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)); } /* 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 (dir, pchar) 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) 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 (count, key) int count, 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 (count, key) int count, 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. */ int rl_noninc_forward_search_again (count, key) int count, key; { int r; if (!noninc_search_string) { rl_ding (); return (-1); } r = noninc_dosearch (noninc_search_string, 1); return (r != 1); } /* 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; { int r; if (!noninc_search_string) { rl_ding (); return (-1); } r = noninc_dosearch (noninc_search_string, -1); return (r != 1); } #if defined (READLINE_CALLBACKS) int _rl_nsearch_callback (cxt) _rl_search_cxt *cxt; { int c, r; c = _rl_search_getchar (cxt); 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 (count, dir) int count, dir; { HIST_ENTRY *temp; int ret, oldpos; rl_maybe_save_line (); temp = (HIST_ENTRY *)NULL; /* Search COUNT times through the history for a line whose prefix matches history_search_string. When this loop finishes, TEMP, if non-null, is the history line to copy into the line buffer. */ while (count) { ret = noninc_search_from_pos (history_search_string, rl_history_search_pos + dir, dir); 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 (); 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); rl_point = rl_history_search_len; rl_mark = rl_end; return 0; } static void rl_history_search_reinit () { rl_history_search_pos = where_history (); rl_history_search_len = rl_point; prev_line_found = (char *)NULL; if (rl_point) { 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); } history_search_string[0] = '^'; strncpy (history_search_string + 1, rl_line_buffer, rl_point); history_search_string[rl_point + 1] = '\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. */ int rl_history_search_forward (count, ignore) int count, 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 (); 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 (count, ignore) int count, 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 (); if (rl_history_search_len == 0) return (rl_get_previous_history (count, ignore)); return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1)); }
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