/* 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. */ #include #if defined (__GNUC__) # define alloca __builtin_alloca #else # if defined (sparc) || defined (HAVE_ALLOCA_H) # include # endif #endif #include "readline.h" #include "history.h" extern char *xmalloc (), *xrealloc (); /* Variables imported from readline.c */ extern int rl_point, rl_end, rl_line_buffer_len; extern Keymap _rl_keymap; extern char *rl_prompt; extern char *rl_line_buffer; extern HIST_ENTRY *saved_line_for_history; static char *noninc_search_string = (char *) NULL; static int noninc_history_pos = 0; /* 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; 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 (); history_set_pos (oldpos); { int line_len; 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) 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, pmtlen; 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; pmtlen = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0; p = (char *)alloca (2 + pmtlen); if (pmtlen) strcpy (p, rl_prompt); p[pmtlen] = pchar ? pchar : ':'; p[pmtlen + 1] = '\0'; rl_message (p, 0, 0); /* 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; return; } /* FALLTHROUGH */ case CTRL('W'): case CTRL('U'): rl_dispatch (c, _rl_keymap); 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 (); return; default: rl_insert (1, c); break; } rl_redisplay (); } 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 (); 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); } 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 `?'. */ rl_noninc_forward_search (count, key) int count, key; { if (key == '?') noninc_search (1, '?'); else noninc_search (1, 0); } /* Reverse search the history list for a string. If the vi-mode code calls this, KEY will be `/'. */ rl_noninc_reverse_search (count, key) int count, key; { if (key == '/') noninc_search (-1, '/'); else noninc_search (-1, 0); } /* Search forward through the history list for the last string searched for. If there is no saved search string, abort. */ rl_noninc_forward_search_again (count, key) int count, key; { if (!noninc_search_string) { ding (); return (-1); } noninc_dosearch (noninc_search_string, 1); } /* Reverse search in the history list for the last string searched for. If there is no saved search string, abort. */ rl_noninc_reverse_search_again (count, key) int count, key; { if (!noninc_search_string) { ding (); return (-1); } noninc_dosearch (noninc_search_string, -1); }