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

1.1     ! misho       1: /* hist_purgecmd -- remove all instances of command or pattern from history
        !             2:    file */
        !             3: 
        !             4: /* Copyright (C) 2011 Free Software Foundation, Inc.
        !             5: 
        !             6:    This file is part of the GNU Readline Library (Readline), a library for
        !             7:    reading lines of text with interactive input and history editing.
        !             8: 
        !             9:    Readline 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 3 of the License, or
        !            12:    (at your option) any later version.
        !            13: 
        !            14:    Readline is distributed in the hope that it will be useful,
        !            15:    but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            16:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            17:    GNU General Public License for more details.
        !            18: 
        !            19:    You should have received a copy of the GNU General Public License
        !            20:    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
        !            21: */
        !            22: #ifndef READLINE_LIBRARY
        !            23: #define READLINE_LIBRARY 1
        !            24: #endif
        !            25: 
        !            26: #include <unistd.h>
        !            27: #include <stdlib.h>
        !            28: #include <stdio.h>
        !            29: 
        !            30: #include <regex.h>
        !            31: 
        !            32: #ifdef READLINE_LIBRARY
        !            33: #  include "history.h"
        !            34: #else
        !            35: #  include <readline/history.h>
        !            36: #endif
        !            37: 
        !            38: #include <string.h>
        !            39: 
        !            40: #define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0)
        !            41: #define STREQN(a, b, n) ((n == 0) ? (1) \
        !            42:                                   : ((a)[0] == (b)[0] && strncmp(a, b, n) == 0))
        !            43: 
        !            44: extern int history_offset;
        !            45: 
        !            46: #define PURGE_REGEXP   0x01
        !            47: 
        !            48: static void
        !            49: usage()
        !            50: {
        !            51:   fprintf (stderr, "hist_purgecmd: usage: hist_purgecmd [-r] [-t] [-f filename] command-spec\n");
        !            52:   exit (2);
        !            53: }
        !            54: 
        !            55: int
        !            56: main (argc, argv)
        !            57:      int argc;
        !            58:      char **argv;
        !            59: {
        !            60:   char *fn;
        !            61:   int r, flags;
        !            62: 
        !            63:   flags = 0;
        !            64:   fn = 0;
        !            65:   while ((r = getopt (argc, argv, "f:rt")) != -1)
        !            66:     {
        !            67:       switch (r)
        !            68:        {
        !            69:        case 'f':
        !            70:          fn = optarg;
        !            71:          break;
        !            72:        case 'r':
        !            73:          flags |= PURGE_REGEXP;
        !            74:          break;
        !            75:        case 't':
        !            76:          history_write_timestamps = 1;
        !            77:          break;
        !            78:        default:
        !            79:          usage ();
        !            80:        }
        !            81:     }
        !            82:   argv += optind;
        !            83:   argc -= optind;
        !            84: 
        !            85:   if (fn == 0)
        !            86:     fn = getenv ("HISTFILE");
        !            87:   if (fn == 0)
        !            88:     {
        !            89:       fprintf (stderr, "hist_purgecmd: no history file\n");
        !            90:       usage ();
        !            91:     }
        !            92: 
        !            93:   if ((r = read_history (fn)) != 0)
        !            94:     {
        !            95:       fprintf (stderr, "hist_purgecmd: read_history: %s: %s\n", fn, strerror (r));
        !            96:       exit (1);
        !            97:     }
        !            98: 
        !            99:   for (r = 0; r < argc; r++)
        !           100:     hist_purgecmd (argv[r], flags);
        !           101: 
        !           102:   if ((r = write_history (fn)) != 0)
        !           103:     {
        !           104:       fprintf (stderr, "hist_purgecmd: write_history: %s: %s\n", fn, strerror (r));
        !           105:       exit (1);
        !           106:     }
        !           107: 
        !           108:   exit (0);
        !           109: }
        !           110: 
        !           111: int
        !           112: hist_purgecmd (cmd, flags)
        !           113:      char *cmd;
        !           114:      int flags;
        !           115: {
        !           116:   int r, n, rflags;
        !           117:   HIST_ENTRY *temp;
        !           118:   regex_t regex = { 0 };
        !           119: 
        !           120:   if (flags & PURGE_REGEXP)
        !           121:     {
        !           122:       rflags = REG_EXTENDED|REG_NOSUB;
        !           123:       if (regcomp (&regex, cmd, rflags))
        !           124:        {
        !           125:          fprintf (stderr, "hist_purgecmd: %s: invalid regular expression\n", cmd);
        !           126:          return -1;
        !           127:        }
        !           128:     }
        !           129: 
        !           130:   r = 0;
        !           131:   using_history ();
        !           132:   r = where_history ();
        !           133:   for (n = 0; n < r; n++)
        !           134:     {
        !           135:       temp = history_get (n+history_base);
        !           136:       if (((flags & PURGE_REGEXP) && (regexec (&regex, temp->line, 0, 0, 0) == 0)) ||
        !           137:          ((flags & PURGE_REGEXP) == 0 && STREQ (temp->line, cmd)))
        !           138:        {
        !           139:          remove_history (n);
        !           140:          r--;                  /* have to get one fewer now */
        !           141:          n--;                  /* compensate for above increment */
        !           142:          history_offset--;     /* moving backwards in history list */
        !           143:        }
        !           144:     }
        !           145:   using_history ();
        !           146: 
        !           147:   if (flags & PURGE_REGEXP)
        !           148:     regfree (&regex);
        !           149: 
        !           150:   return r;
        !           151: }