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/* common.c */
/* Copyright (C) 1993, 1996, 1997 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
2, 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. */
#include "config.h"
/* AIX requires this to be the first thing in the file. */
#ifdef __GNUC__
# define alloca __builtin_alloca
#else
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include "files.h"
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "common.h"
extern char *program_name;
/* Same as `malloc' but report error if no memory available. */
char *
xmalloc (unsigned size)
{
register char *value = (char *) malloc (size);
if (value == 0)
fatal ("virtual memory exhausted");
return value;
}
/* Exit the program with error message S */
void
fatal (char *s)
{
fprintf (stderr, "%s: %s\n", program_name, s);
exit (1);
}
/* open file FILE_NAME & return a pointer to it */
FILE *
file_open (char *file_name, int write_flag)
{
FILE *fp;
if (file_name == NULL)
fatal ("file_open: FILE_NAME is NULL");
if (strcmp (file_name, "-") == 0)
return write_flag ? stdout : stdin;
if ((fp = fopen (file_name, write_flag ? "wb" : "rb")) == NULL)
{
char *tmp = (char *) alloca (sizeof (char) * (strlen (file_name) + 30));
sprintf (tmp, "couldn't open file '%s'", file_name);
perror (tmp);
}
return fp;
}
#ifndef HAVE_RENAME
/*
* rename -- BSD rename(2) clone
*
* This code is in the public domain.
*
* Bugs: Doesn't fail with EACCES if from can't be removed.
* Might leave "to" nonexistent if the system crashes at an unfortunate
* moment.
* It might return unexpected errno values.
*
* Author: Christoph Badura <bad@flatlin.ka.sub.org>
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
int
rename (char *from, char *to)
{
struct stat sbfrom, sbto;
/*
* just try the link(2), if it fails with EEXIST, we'll try plan B.
*/
if (link(from, to) == 0) {
(void) unlink(from); /* XXX what if we can't remove it? */
return 0;
}
if (errno != EEXIST)
return -1;
/*
* Careful now! The following is full of race conditions.
* However, we only want to check for a cross device link and
* should be resonably safe.
*/
if (stat(from, &sbfrom) < 0)
return -1;
if (stat(to, &sbto) < 0)
return -1;
if (sbfrom.st_dev != sbto.st_dev) {
errno = EXDEV;
return -1;
}
/*
* OK, this isn't going to be across file systems,
* therefore its safe to try to remove "to."
*/
if (unlink(to) < 0)
return -1;
/*
* Bug: if the system crashes, "to" is nonexistent. That's
* not compatible, but there's nothing we can do about it.
*/
if (link(from, to) == 0) {
(void) unlink(from); /* XXX what if we can't remove it? */
return 0;
}
return -1;
}
#endif
/* Print the default wtmp file (for ac, last). */
void
print_wtmp_file_location (void)
{
printf ("\nThe system's default login accounting file is %s.\n",
WTMP_FILE_LOC);
}
/* Print the default acct file (for accton, lastcomm). */
void
print_acct_file_location (void)
{
printf ("\nThe system's default process accounting file is %s.\n",
ACCT_FILE_LOC);
}
/* Print the default acct file (for sa). */
void
print_acct_file_locations (void)
{
printf ("The system's default process accounting files are:\n\n");
printf (" raw process accounting data: %s\n", ACCT_FILE_LOC);
printf (" summary by command name: %s\n", SAVACCT_FILE_LOC);
printf (" summary by username: %s\n\n", USRACCT_FILE_LOC);
}
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