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[/] [or1k/] [tags/] [VER_5_3/] [gdb-5.3/] [readline/] [search.c] - Rev 1782
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/* 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 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 "readline.h" #include "history.h" #include "rlprivate.h" #include "xmalloc.h" #ifdef abs # undef abs #endif #define abs(x) (((x) >= 0) ? (x) : -(x)) extern HIST_ENTRY *saved_line_for_history; /* Functions imported from the rest of the library. */ extern int _rl_free_history_entry __P((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; /* 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; { 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 = line_len; if (saved_line_for_history) _rl_free_history_entry (saved_line_for_history); 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; 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 (); #if defined (VI_MODE) if (rl_editing_mode != vi_mode) #endif history_set_pos (oldpos); make_history_line_current (entry); rl_point = 0; rl_clear_message (); } /* 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 (); 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, dir) int count, dir; { HIST_ENTRY *temp; int ret, oldpos; 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) { maybe_unsave_line (); 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'; } #else rl_point = rl_history_search_len; /* maybe_unsave_line changes it */ #endif return 1; } /* Copy the line we found into the current line buffer. */ make_history_line_current (temp); rl_point = rl_history_search_len; 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 = 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'; } } /* 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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