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/* mischelp.c - Miscellaneous helper functions
* Copyright (C) 1998, 2000, 2001, 2006, 2007 Free Software Foundation, Inc.
*
* This file is part of JNLIB.
*
* JNLIB is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* JNLIB is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_W32_SYSTEM
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#else /*!HAVE_W32_SYSTEM*/
# include <sys/types.h>
# include <sys/stat.h>
# include <unistd.h>
#endif /*!HAVE_W32_SYSTEM*/
#include "libjnlib-config.h"
#include "stringhelp.h"
#include "mischelp.h"
/* Check whether the files NAME1 and NAME2 are identical. This is for
example achieved by comparing the inode numbers of the files. */
int
same_file_p (const char *name1, const char *name2)
{
int yes;
/* First try a shortcut. */
if (!compare_filenames (name1, name2))
yes = 1;
else
{
#ifdef HAVE_W32_SYSTEM
HANDLE file1, file2;
BY_HANDLE_FILE_INFORMATION info1, info2;
file1 = CreateFile (name1, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
if (file1 == INVALID_HANDLE_VALUE)
yes = 0; /* If we can't open the file, it is not the same. */
else
{
file2 = CreateFile (name2, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
if (file1 == INVALID_HANDLE_VALUE)
yes = 0; /* If we can't open the file, it is not the same. */
else
{
yes = (GetFileInformationByHandle (file1, &info1)
&& GetFileInformationByHandle (file2, &info2)
&& info1.dwVolumeSerialNumber==info2.dwVolumeSerialNumber
&& info1.nFileIndexHigh == info2.nFileIndexHigh
&& info1.nFileIndexLow == info2.nFileIndexLow);
CloseHandle (file2);
}
CloseHandle (file1);
}
#else /*!HAVE_W32_SYSTEM*/
struct stat info1, info2;
yes = (!stat (name1, &info1) && !stat (name2, &info2)
&& info1.st_dev == info2.st_dev && info1.st_ino == info2.st_ino);
#endif /*!HAVE_W32_SYSTEM*/
}
return yes;
}
/*
timegm() is a GNU function that might not be available everywhere.
It's basically the inverse of gmtime() - you give it a struct tm,
and get back a time_t. It differs from mktime() in that it handles
the case where the struct tm is UTC and the local environment isn't.
Note, that this replacement implementaion is not thread-safe!
Some BSDs don't handle the putenv("foo") case properly, so we use
unsetenv if the platform has it to remove environment variables.
*/
#ifndef HAVE_TIMEGM
time_t
timegm (struct tm *tm)
{
time_t answer;
char *zone;
zone=getenv("TZ");
putenv("TZ=UTC");
tzset();
answer=mktime(tm);
if(zone)
{
static char *old_zone;
if (!old_zone)
{
old_zone = malloc(3+strlen(zone)+1);
if (old_zone)
{
strcpy(old_zone,"TZ=");
strcat(old_zone,zone);
}
}
if (old_zone)
putenv (old_zone);
}
else
#ifdef HAVE_UNSETENV
unsetenv("TZ");
#else
putenv("TZ");
#endif
tzset();
return answer;
}
#endif /*!HAVE_TIMEGM*/
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