| 1 | /* search.c - code for non-incremental searching in emacs and vi modes. */ |
| 2 | |
| 3 | /* Copyright (C) 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the Readline Library (the Library), a set of |
| 6 | routines for providing Emacs style line input to programs that ask |
| 7 | for it. |
| 8 | |
| 9 | The Library is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 1, or (at your option) |
| 12 | any later version. |
| 13 | |
| 14 | The Library is distributed in the hope that it will be useful, but |
| 15 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | General Public License for more details. |
| 18 | |
| 19 | The GNU General Public License is often shipped with GNU software, and |
| 20 | is generally kept in a file called COPYING or LICENSE. If you do not |
| 21 | have a copy of the license, write to the Free Software Foundation, |
| 22 | 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | |
| 26 | #if defined (__GNUC__) |
| 27 | # define alloca __builtin_alloca |
| 28 | #else |
| 29 | # if defined (sparc) || defined (HAVE_ALLOCA_H) |
| 30 | # include <alloca.h> |
| 31 | # endif |
| 32 | #endif |
| 33 | |
| 34 | #include "readline.h" |
| 35 | #include "history.h" |
| 36 | |
| 37 | extern char *xmalloc (), *xrealloc (); |
| 38 | |
| 39 | /* Variables imported from readline.c */ |
| 40 | extern int rl_point, rl_end, rl_line_buffer_len; |
| 41 | extern Keymap _rl_keymap; |
| 42 | extern char *rl_prompt; |
| 43 | extern char *rl_line_buffer; |
| 44 | extern HIST_ENTRY *saved_line_for_history; |
| 45 | |
| 46 | static char *noninc_search_string = (char *) NULL; |
| 47 | static int noninc_history_pos = 0; |
| 48 | |
| 49 | /* Search the history list for STRING starting at absolute history position |
| 50 | POS. If STRING begins with `^', the search must match STRING at the |
| 51 | beginning of a history line, otherwise a full substring match is performed |
| 52 | for STRING. DIR < 0 means to search backwards through the history list, |
| 53 | DIR >= 0 means to search forward. */ |
| 54 | static int |
| 55 | noninc_search_from_pos (string, pos, dir) |
| 56 | char *string; |
| 57 | int pos, dir; |
| 58 | { |
| 59 | int ret, old; |
| 60 | |
| 61 | old = where_history (); |
| 62 | history_set_pos (pos); |
| 63 | |
| 64 | if (*string == '^') |
| 65 | ret = history_search_prefix (string + 1, dir); |
| 66 | else |
| 67 | ret = history_search (string, dir); |
| 68 | |
| 69 | if (ret != -1) |
| 70 | ret = where_history (); |
| 71 | |
| 72 | history_set_pos (old); |
| 73 | return (ret); |
| 74 | } |
| 75 | |
| 76 | /* Search for a line in the history containing STRING. If DIR is < 0, the |
| 77 | search is backwards through previous entries, else through subsequent |
| 78 | entries. */ |
| 79 | static void |
| 80 | noninc_dosearch (string, dir) |
| 81 | char *string; |
| 82 | int dir; |
| 83 | { |
| 84 | int oldpos, pos; |
| 85 | HIST_ENTRY *entry; |
| 86 | |
| 87 | if (string == 0 || *string == 0 || noninc_history_pos < 0) |
| 88 | { |
| 89 | ding (); |
| 90 | return; |
| 91 | } |
| 92 | |
| 93 | pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir); |
| 94 | if (pos == -1) |
| 95 | { |
| 96 | /* Search failed, current history position unchanged. */ |
| 97 | maybe_unsave_line (); |
| 98 | rl_clear_message (); |
| 99 | rl_point = 0; |
| 100 | ding (); |
| 101 | return; |
| 102 | } |
| 103 | |
| 104 | noninc_history_pos = pos; |
| 105 | |
| 106 | oldpos = where_history (); |
| 107 | history_set_pos (noninc_history_pos); |
| 108 | entry = current_history (); |
| 109 | history_set_pos (oldpos); |
| 110 | |
| 111 | { |
| 112 | int line_len; |
| 113 | |
| 114 | line_len = strlen (entry->line); |
| 115 | if (line_len >= rl_line_buffer_len) |
| 116 | rl_extend_line_buffer (line_len); |
| 117 | strcpy (rl_line_buffer, entry->line); |
| 118 | } |
| 119 | |
| 120 | rl_undo_list = (UNDO_LIST *)entry->data; |
| 121 | rl_end = strlen (rl_line_buffer); |
| 122 | rl_point = 0; |
| 123 | rl_clear_message (); |
| 124 | |
| 125 | if (saved_line_for_history) |
| 126 | free_history_entry (saved_line_for_history); |
| 127 | saved_line_for_history = (HIST_ENTRY *)NULL; |
| 128 | } |
| 129 | |
| 130 | /* Search non-interactively through the history list. DIR < 0 means to |
| 131 | search backwards through the history of previous commands; otherwise |
| 132 | the search is for commands subsequent to the current position in the |
| 133 | history list. PCHAR is the character to use for prompting when reading |
| 134 | the search string; if not specified (0), it defaults to `:'. */ |
| 135 | static void |
| 136 | noninc_search (dir, pchar) |
| 137 | int dir; |
| 138 | int pchar; |
| 139 | { |
| 140 | int saved_point, c, pmtlen; |
| 141 | char *p; |
| 142 | |
| 143 | maybe_save_line (); |
| 144 | saved_point = rl_point; |
| 145 | |
| 146 | /* Use the line buffer to read the search string. */ |
| 147 | rl_line_buffer[0] = 0; |
| 148 | rl_end = rl_point = 0; |
| 149 | |
| 150 | pmtlen = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0; |
| 151 | p = (char *)alloca (2 + pmtlen); |
| 152 | if (pmtlen) |
| 153 | strcpy (p, rl_prompt); |
| 154 | p[pmtlen] = pchar ? pchar : ':'; |
| 155 | p[pmtlen + 1] = '\0'; |
| 156 | |
| 157 | rl_message (p, 0, 0); |
| 158 | |
| 159 | /* Read the search string. */ |
| 160 | while (c = rl_read_key ()) |
| 161 | { |
| 162 | switch (c) |
| 163 | { |
| 164 | case CTRL('H'): |
| 165 | case RUBOUT: |
| 166 | if (rl_point == 0) |
| 167 | { |
| 168 | maybe_unsave_line (); |
| 169 | rl_clear_message (); |
| 170 | rl_point = saved_point; |
| 171 | return; |
| 172 | } |
| 173 | /* FALLTHROUGH */ |
| 174 | |
| 175 | case CTRL('W'): |
| 176 | case CTRL('U'): |
| 177 | rl_dispatch (c, _rl_keymap); |
| 178 | break; |
| 179 | |
| 180 | case RETURN: |
| 181 | case NEWLINE: |
| 182 | goto dosearch; |
| 183 | /* NOTREACHED */ |
| 184 | break; |
| 185 | |
| 186 | case CTRL('C'): |
| 187 | case CTRL('G'): |
| 188 | maybe_unsave_line (); |
| 189 | rl_clear_message (); |
| 190 | rl_point = saved_point; |
| 191 | ding (); |
| 192 | return; |
| 193 | |
| 194 | default: |
| 195 | rl_insert (1, c); |
| 196 | break; |
| 197 | } |
| 198 | rl_redisplay (); |
| 199 | } |
| 200 | |
| 201 | dosearch: |
| 202 | /* If rl_point == 0, we want to re-use the previous search string and |
| 203 | start from the saved history position. If there's no previous search |
| 204 | string, punt. */ |
| 205 | if (rl_point == 0) |
| 206 | { |
| 207 | if (!noninc_search_string) |
| 208 | { |
| 209 | ding (); |
| 210 | return; |
| 211 | } |
| 212 | } |
| 213 | else |
| 214 | { |
| 215 | /* We want to start the search from the current history position. */ |
| 216 | noninc_history_pos = where_history (); |
| 217 | if (noninc_search_string) |
| 218 | free (noninc_search_string); |
| 219 | noninc_search_string = savestring (rl_line_buffer); |
| 220 | } |
| 221 | |
| 222 | noninc_dosearch (noninc_search_string, dir); |
| 223 | } |
| 224 | |
| 225 | /* Search forward through the history list for a string. If the vi-mode |
| 226 | code calls this, KEY will be `?'. */ |
| 227 | rl_noninc_forward_search (count, key) |
| 228 | int count, key; |
| 229 | { |
| 230 | if (key == '?') |
| 231 | noninc_search (1, '?'); |
| 232 | else |
| 233 | noninc_search (1, 0); |
| 234 | } |
| 235 | |
| 236 | /* Reverse search the history list for a string. If the vi-mode code |
| 237 | calls this, KEY will be `/'. */ |
| 238 | rl_noninc_reverse_search (count, key) |
| 239 | int count, key; |
| 240 | { |
| 241 | if (key == '/') |
| 242 | noninc_search (-1, '/'); |
| 243 | else |
| 244 | noninc_search (-1, 0); |
| 245 | } |
| 246 | |
| 247 | /* Search forward through the history list for the last string searched |
| 248 | for. If there is no saved search string, abort. */ |
| 249 | rl_noninc_forward_search_again (count, key) |
| 250 | int count, key; |
| 251 | { |
| 252 | if (!noninc_search_string) |
| 253 | { |
| 254 | ding (); |
| 255 | return (-1); |
| 256 | } |
| 257 | noninc_dosearch (noninc_search_string, 1); |
| 258 | } |
| 259 | |
| 260 | /* Reverse search in the history list for the last string searched |
| 261 | for. If there is no saved search string, abort. */ |
| 262 | rl_noninc_reverse_search_again (count, key) |
| 263 | int count, key; |
| 264 | { |
| 265 | if (!noninc_search_string) |
| 266 | { |
| 267 | ding (); |
| 268 | return (-1); |
| 269 | } |
| 270 | noninc_dosearch (noninc_search_string, -1); |
| 271 | } |