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/*
Copyright (C) 1997, 2003, 2008, 2009, 2010 Free Software Foundation, Inc.
This file is part of the GNU Accounting Utilities
The GNU Accounting Utilities are free software; you can redistribute
them and/or modify them under the terms of the GNU General Public
License as published by the Free Software Foundation; either version
3, or (at your option) any later version.
The GNU Accounting Utilities are distributed in the hope that they 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.
You should have received a copy of the GNU General Public License
along with the GNU Accounting Utilities; see the file COPYING. If
not, write to the Free Software Foundation, 675 Mass Ave, Cambridge,
MA 02139, USA.
*/
/* print a utmp file in human-readable format. */
#include "config.h"
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "common.h"
#include "files.h"
#include "utmp_rd.h"
#ifdef HAVE_GETOPT_LONG_ONLY
#include <getopt.h>
#else
#include "getopt.h"
#endif
char *program_name;
int debugging_enabled = 0; /* no -- we don't care about bad
records or the file-reading
algorithms. */
void give_usage(void)
{
printf ("Usage: %s [-hrR] [-n <recs>] <files>\n\
[--num <recs>] [--raw] [--reverse] [--help]\n",
program_name);
print_wtmp_file_location ();
}
int main(int argc, char *argv[])
{
int c;
int backwards_flag = 0; /* nonzero means read from the end */
long num_lines_to_print = -1; /* -1 means all */
int raw = 0;
program_name = argv[0];
while (1)
{
int option_index = 0;
static struct option long_options[] =
{
{ "reverse", no_argument, NULL, 1
},
{ "help", no_argument, NULL, 2 },
{ "num", required_argument, NULL, 3 },
{ "raw", no_argument, NULL, 4 },
{ 0, 0, 0, 0 },
};
c = getopt_long (argc, argv, "rhn:R", long_options, &option_index);
if (c == EOF)
break;
switch (c)
{
case 'r':
case 1:
backwards_flag = 1;
break;
case 'h':
case 2:
give_usage();
exit(EXIT_FAILURE);
case 'n':
case 3:
num_lines_to_print = strtol(optarg, (char **)NULL, 10);
if (num_lines_to_print < 1)
fatal ("number of lines to print must be positive and non-zero");
break;
case 'R':
case 4:
raw = 1;
break;
}
}
if (optind >= argc)
{
/* User didn't pass any filenames -- give them the usage
message. */
give_usage();
exit(EXIT_FAILURE);
}
/* Init the file reader */
utmp_init (backwards_flag);
/* Add all files that we want to dump. */
while (optind < argc)
add_utmp_file (argv[optind++]);
/* Dump the records. */
{
struct utmp *rec;
while ((rec = utmp_get_entry ()) != NULL)
{
if (raw)
(void)fwrite (rec, sizeof (struct utmp), 1, stdout);
else
print_utmp_record (rec, stdout);
if (num_lines_to_print > -1)
{
num_lines_to_print--;
if (num_lines_to_print == 0) /* max lines printed */
exit(EXIT_SUCCESS);
}
}
}
exit(EXIT_SUCCESS);
}
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