src/viewer/search.c

   1 /*
   2    Internal file viewer for the Midnight Commander
   3    Function for search data
   4
   5    Copyright (C) 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003,
   6    2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
   7
   8    Written by: 1994, 1995, 1998 Miguel de Icaza
   9                1994, 1995 Janne Kukonlehto
  10                1995 Jakub Jelinek
  11                1996 Joseph M. Hinkle
  12                1997 Norbert Warmuth
  13                1998 Pavel Machek
  14                2004 Roland Illig <roland.illig@gmx.de>
  15                2005 Roland Illig <roland.illig@gmx.de>
  16                2009 Slava Zanko <slavazanko@google.com>
  17                2009 Andrew Borodin <aborodin@vmail.ru>
  18                2009 Ilia Maslakov <il.smind@gmail.com>
  19
  20    This file is part of the Midnight Commander.
  21
  22    The Midnight Commander is free software; you can redistribute it
  23    and/or modify it under the terms of the GNU General Public License as
  24    published by the Free Software Foundation; either version 2 of the
  25    License, or (at your option) any later version.
  26
  27    The Midnight Commander is distributed in the hope that it will be
  28    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  29    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30    General Public License for more details.
  31
  32    You should have received a copy of the GNU General Public License
  33    along with this program; if not, write to the Free Software
  34    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  35    MA 02110-1301, USA.
  36  */
  37
  38 #include <config.h>
  39
  40 #include "../src/global.h"
  41 #include "../src/setup.h"
  42 #include "../src/wtools.h"
  43 #include "../src/tty/tty.h"
  44 #include "../src/viewer/internal.h"
  45
  46 /*** global variables ****************************************************************************/
  47
  48 /*** file scope macro definitions ****************************************************************/
  49
  50 /*** file scope type declarations ****************************************************************/
  51
  52 /*** file scope variables ************************************************************************/
  53
  54 /*** file scope functions ************************************************************************/
  55
  56
  57 /* --------------------------------------------------------------------------------------------- */
  58 static void
  59 mcview_search_update_steps (mcview_t * view)
  60 {
  61     off_t filesize = mcview_get_filesize (view);
  62     if (filesize != 0)
  63         view->update_steps = 40000;
  64     else                        /* viewing a data stream, not a file */
  65         view->update_steps = filesize / 100;
  66
  67     /* Do not update the percent display but every 20 ks */
  68     if (view->update_steps < 20000)
  69         view->update_steps = 20000;
  70 }
  71
  72 /* --------------------------------------------------------------------------------------------- */
  73
  74 static gboolean
  75 mcview_find (mcview_t * view, gsize search_start, gsize * len)
  76 {
  77     gsize search_end;
  78
  79     view->search_numNeedSkipChar = 0;
  80
  81     if (view->search_backwards) {
  82         search_end = mcview_get_filesize (view);
  83         while ((int) search_start >= 0) {
  84             if (search_end > search_start + view->search->original_len
  85                 && mc_search_is_fixed_search_str (view->search))
  86                 search_end = search_start + view->search->original_len;
  87
  88             if (mc_search_run (view->search, (void *) view, search_start, search_end, len)
  89                 && view->search->normal_offset == search_start)
  90                 return TRUE;
  91
  92             search_start--;
  93         }
  94         view->search->error_str = g_strdup (_(" Search string not found "));
  95         return FALSE;
  96     }
  97     return mc_search_run (view->search, (void *) view, search_start, mcview_get_filesize (view),
  98                           len);
  99 }
 100
 101 /* --------------------------------------------------------------------------------------------- */
 102
 103 /*** public functions ****************************************************************************/
 104
 105 /* --------------------------------------------------------------------------------------------- */
 106
 107 int
 108 mcview_search_cmd_callback (const void *user_data, gsize char_offset)
 109 {
 110     int byte;
 111     mcview_t *view = (mcview_t *) user_data;
 112
 113     byte = mcview_get_byte (view, char_offset);
 114     if (byte == -1)
 115         return MC_SEARCH_CB_ABORT;
 116     /*    view_read_continue (view, &view->search_onechar_info); *//* AB:FIXME */
 117
 118     if (view->search_numNeedSkipChar) {
 119         view->search_numNeedSkipChar--;
 120         if (view->search_numNeedSkipChar) {
 121             return byte;
 122         }
 123         return MC_SEARCH_CB_SKIP;
 124     }
 125 #if 0                           /* AB:FIXME */
 126     if (view_read_test_nroff_back (view, &view->search_onechar_info)) {
 127         if (cmp (view->search_onechar_info.chi1, "_") && (!cmp (view->search_onechar_info.cnxt, "_")
 128                                                           || !cmp (view->search_onechar_info.chi2,
 129                                                                    "\b"))
 130             )
 131             view->search_numNeedSkipChar = 2;
 132         else
 133             view->search_numNeedSkipChar = 1;
 134
 135         return MC_SEARCH_CB_SKIP;
 136     }
 137     if (byte == '_' && *view->search_onechar_info.cnxt == 0x8) {
 138         view->search_numNeedSkipChar = 1;
 139         return MC_SEARCH_CB_SKIP;
 140     }
 141 #endif
 142
 143     return byte;
 144 }
 145
 146 /* --------------------------------------------------------------------------------------------- */
 147
 148 int
 149 mcview_search_update_cmd_callback (const void *user_data, gsize char_offset)
 150 {
 151     mcview_t *view = (mcview_t *) user_data;
 152
 153     if (char_offset >= view->update_activate) {
 154         view->update_activate += view->update_steps;
 155         if (verbose) {
 156             mcview_percent (view, char_offset);
 157             tty_refresh ();
 158         }
 159         if (tty_got_interrupt ())
 160             return MC_SEARCH_CB_ABORT;
 161     }
 162     /* may be in future return from this callback will change current position
 163      * in searching block. Now this just constant return value.
 164      */
 165     return 1;
 166 }
 167
 168 /* --------------------------------------------------------------------------------------------- */
 169
 170 void
 171 mcview_do_search (mcview_t * view)
 172 {
 173     off_t search_start;
 174     gboolean isFound = FALSE;
 175
 176     Dlg_head *d = NULL;
 177
 178     size_t match_len;
 179
 180     if (verbose) {
 181         d = create_message (D_NORMAL, _("Search"), _("Searching %s"), view->last_search_string);
 182         tty_refresh ();
 183     }
 184
 185     /*for avoid infinite search loop we need to increase or decrease start offset of search */
 186
 187     if (view->search_start) {
 188         search_start = (view->search_backwards) ? -2 : 2;
 189         search_start = view->search_start + search_start +
 190             mcview__get_nroff_real_len (view, view->search_start, 2) * search_start;
 191     } else {
 192         search_start = view->search_start;
 193     }
 194
 195     if (view->search_backwards && (int) search_start < 0)
 196         search_start = 0;
 197
 198     /* Compute the percent steps */
 199     mcview_search_update_steps (view);
 200     view->update_activate = 0;
 201
 202     tty_enable_interrupt_key ();
 203
 204     do {
 205         if (mcview_find (view, search_start, &match_len)) {
 206             view->search_start = view->search->normal_offset +
 207                 mcview__get_nroff_real_len (view,
 208                                             view->search->start_buffer,
 209                                             view->search->normal_offset -
 210                                             view->search->start_buffer);
 211
 212             if (!view->hex_mode)
 213                 view->search_start ++;
 214
 215             view->search_end = view->search_start + match_len +
 216                 mcview__get_nroff_real_len (view, view->search_start, match_len + 1);
 217
 218             if (view->hex_mode) {
 219                 view->hex_cursor = view->search_start;
 220                 view->hexedit_lownibble = FALSE;
 221                 view->dpy_start = view->search_start - view->search_start % view->bytes_per_line;
 222                 view->dpy_end = view->search_end - view->search_end % view->bytes_per_line;
 223             }
 224
 225             if (verbose) {
 226                 dlg_run_done (d);
 227                 destroy_dlg (d);
 228                 d = create_message (D_NORMAL, _("Search"), _("Seeking to search result"));
 229                 tty_refresh ();
 230             }
 231
 232             mcview_moveto_match (view);
 233             isFound = TRUE;
 234             break;
 235         }
 236     } while (mcview_may_still_grow (view));
 237
 238     if (!isFound) {
 239         if (view->search->error_str)
 240             message (D_NORMAL, _("Search"), "%s", view->search->error_str);
 241     }
 242
 243     view->dirty++;
 244     mcview_update (view);
 245
 246
 247     tty_disable_interrupt_key ();
 248     if (verbose) {
 249         dlg_run_done (d);
 250         destroy_dlg (d);
 251     }
 252
 253 }
 254
 255 /* --------------------------------------------------------------------------------------------- */