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