Return to hist_erasedups.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / readline / examples

Annotation of embedaddon/readline/examples/hist_erasedups.c, revision 1.1

1.1     ! misho       1: /* hist_erasedups -- remove all duplicate entries from history file */
        !             2: 
        !             3: /* Copyright (C) 2011 Free Software Foundation, Inc.
        !             4: 
        !             5:    This file is part of the GNU Readline Library (Readline), a library for
        !             6:    reading lines of text with interactive input and history editing.
        !             7: 
        !             8:    Readline is free software: you can redistribute it and/or modify
        !             9:    it under the terms of the GNU General Public License as published by
        !            10:    the Free Software Foundation, either version 3 of the License, or
        !            11:    (at your option) any later version.
        !            12: 
        !            13:    Readline is distributed in the hope that it will be useful,
        !            14:    but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            16:    GNU General Public License for more details.
        !            17: 
        !            18:    You should have received a copy of the GNU General Public License
        !            19:    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
        !            20: */
        !            21: #ifndef READLINE_LIBRARY
        !            22: #define READLINE_LIBRARY 1
        !            23: #endif
        !            24: 
        !            25: #include <unistd.h>
        !            26: #include <stdlib.h>
        !            27: #include <stdio.h>
        !            28: 
        !            29: #ifdef READLINE_LIBRARY
        !            30: #  include "history.h"
        !            31: #else
        !            32: #  include <readline/history.h>
        !            33: #endif
        !            34: 
        !            35: #include <string.h>
        !            36: 
        !            37: #define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0)
        !            38: #define STREQN(a, b, n) ((n == 0) ? (1) \
        !            39:                                   : ((a)[0] == (b)[0] && strncmp(a, b, n) == 0))
        !            40: 
        !            41: extern int history_offset;
        !            42:                                   
        !            43: static void
        !            44: usage()
        !            45: {
        !            46:   fprintf (stderr, "hist_erasedups: usage: hist_erasedups [-t] [filename]\n");
        !            47:   exit (2);
        !            48: }
        !            49: 
        !            50: int
        !            51: main (argc, argv)
        !            52:      int argc;
        !            53:      char **argv;
        !            54: {
        !            55:   char *fn;
        !            56:   int r;
        !            57: 
        !            58:   while ((r = getopt (argc, argv, "t")) != -1)
        !            59:     {
        !            60:       switch (r)
        !            61:        {
        !            62:        case 't':
        !            63:          history_write_timestamps = 1;
        !            64:          break;
        !            65:        default:
        !            66:          usage ();
        !            67:        }
        !            68:     }
        !            69:   argv += optind;
        !            70:   argc -= optind;
        !            71: 
        !            72:   fn = argc ? argv[0] : getenv ("HISTFILE");
        !            73:   if (fn == 0)
        !            74:     {
        !            75:       fprintf (stderr, "hist_erasedups: no history file\n");
        !            76:       usage ();
        !            77:     }
        !            78: 
        !            79:   if ((r = read_history (fn)) != 0)
        !            80:     {
        !            81:       fprintf (stderr, "hist_erasedups: read_history: %s: %s\n", fn, strerror (r));
        !            82:       exit (1);
        !            83:     }
        !            84: 
        !            85:   hist_erasedups ();
        !            86: 
        !            87:   if ((r = write_history (fn)) != 0)
        !            88:     {
        !            89:       fprintf (stderr, "hist_erasedups: write_history: %s: %s\n", fn, strerror (r));
        !            90:       exit (1);
        !            91:     }
        !            92: 
        !            93:   exit (0);
        !            94: }
        !            95: 
        !            96: int
        !            97: hist_erasedups ()
        !            98: {
        !            99:   int r, n;
        !           100:   HIST_ENTRY *h, *temp;
        !           101: 
        !           102:   using_history ();
        !           103:   while (h = previous_history ())
        !           104:     {
        !           105:       r = where_history ();
        !           106:       for (n = 0; n < r; n++)
        !           107:        {
        !           108:          temp = history_get (n+history_base);
        !           109:          if (STREQ (h->line, temp->line))
        !           110:            {
        !           111:              remove_history (n);
        !           112:              r--;                      /* have to get one fewer now */
        !           113:              n--;                      /* compensate for above increment */
        !           114:              history_offset--;         /* moving backwards in history list */
        !           115:            }
        !           116:        }
        !           117:     }
        !           118:   using_history ();
        !           119: 
        !           120:   return r;
        !           121: }