LCOV - code coverage report
Current view: top level - common - mischelp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 6 0.0 %
Date: 2016-11-29 15:00:56 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /* mischelp.c - Miscellaneous helper functions
       2             :  * Copyright (C) 1998, 2000, 2001, 2006, 2007 Free Software Foundation, Inc.
       3             :  *
       4             :  * This file is part of GnuPG.
       5             :  *
       6             :  * GnuPG is free software; you can redistribute it and/or modify it
       7             :  * under the terms of either
       8             :  *
       9             :  *   - the GNU Lesser General Public License as published by the Free
      10             :  *     Software Foundation; either version 3 of the License, or (at
      11             :  *     your option) any later version.
      12             :  *
      13             :  * or
      14             :  *
      15             :  *   - the GNU General Public License as published by the Free
      16             :  *     Software Foundation; either version 2 of the License, or (at
      17             :  *     your option) any later version.
      18             :  *
      19             :  * or both in parallel, as here.
      20             :  *
      21             :  * GnuPG is distributed in the hope that it will be useful, but
      22             :  * WITHOUT ANY WARRANTY; without even the implied warranty of
      23             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24             :  * General Public License for more details.
      25             :  *
      26             :  * You should have received a copies of the GNU General Public License
      27             :  * and the GNU Lesser General Public License along with this program;
      28             :  * if not, see <https://www.gnu.org/licenses/>.
      29             :  */
      30             : 
      31             : #include <config.h>
      32             : #include <stdlib.h>
      33             : #include <string.h>
      34             : #include <time.h>
      35             : #ifdef HAVE_W32_SYSTEM
      36             : # define WIN32_LEAN_AND_MEAN
      37             : # include <windows.h>
      38             : #else /*!HAVE_W32_SYSTEM*/
      39             : # include <sys/types.h>
      40             : # include <sys/stat.h>
      41             : # include <unistd.h>
      42             : #endif /*!HAVE_W32_SYSTEM*/
      43             : #include <errno.h>
      44             : 
      45             : #include "util.h"
      46             : #include "common-defs.h"
      47             : #include "stringhelp.h"
      48             : #include "utf8conv.h"
      49             : #include "mischelp.h"
      50             : 
      51             : 
      52             : /* Check whether the files NAME1 and NAME2 are identical.  This is for
      53             :    example achieved by comparing the inode numbers of the files.  */
      54             : int
      55           0 : same_file_p (const char *name1, const char *name2)
      56             : {
      57             :   int yes;
      58             : 
      59             :   /* First try a shortcut.  */
      60           0 :   if (!compare_filenames (name1, name2))
      61           0 :     yes = 1;
      62             :   else
      63             :     {
      64             : #ifdef HAVE_W32_SYSTEM
      65             :       HANDLE file1, file2;
      66             :       BY_HANDLE_FILE_INFORMATION info1, info2;
      67             : 
      68             : #ifdef HAVE_W32CE_SYSTEM
      69             :       {
      70             :         wchar_t *wname = utf8_to_wchar (name1);
      71             :         if (wname)
      72             :           file1 = CreateFile (wname, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
      73             :         else
      74             :           file1 = INVALID_HANDLE_VALUE;
      75             :         xfree (wname);
      76             :       }
      77             : #else
      78             :       file1 = CreateFile (name1, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
      79             : #endif
      80             :       if (file1 == INVALID_HANDLE_VALUE)
      81             :         yes = 0; /* If we can't open the file, it is not the same.  */
      82             :       else
      83             :         {
      84             : #ifdef HAVE_W32CE_SYSTEM
      85             :           {
      86             :             wchar_t *wname = utf8_to_wchar (name2);
      87             :             if (wname)
      88             :               file2 = CreateFile (wname, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
      89             :             else
      90             :               file2 = INVALID_HANDLE_VALUE;
      91             :             xfree (wname);
      92             :           }
      93             : #else
      94             :           file2 = CreateFile (name2, 0, 0, NULL, OPEN_EXISTING, 0, NULL);
      95             : #endif
      96             :           if (file2 == INVALID_HANDLE_VALUE)
      97             :             yes = 0; /* If we can't open the file, it is not the same.  */
      98             :           else
      99             :             {
     100             :               yes = (GetFileInformationByHandle (file1, &info1)
     101             :                      && GetFileInformationByHandle (file2, &info2)
     102             :                      && info1.dwVolumeSerialNumber==info2.dwVolumeSerialNumber
     103             :                      && info1.nFileIndexHigh == info2.nFileIndexHigh
     104             :                      && info1.nFileIndexLow == info2.nFileIndexLow);
     105             :               CloseHandle (file2);
     106             :             }
     107             :           CloseHandle (file1);
     108             :         }
     109             : #else /*!HAVE_W32_SYSTEM*/
     110             :       struct stat info1, info2;
     111             : 
     112           0 :       yes = (!stat (name1, &info1) && !stat (name2, &info2)
     113           0 :              && info1.st_dev == info2.st_dev && info1.st_ino == info2.st_ino);
     114             : #endif /*!HAVE_W32_SYSTEM*/
     115             :     }
     116           0 :   return yes;
     117             : }
     118             : 
     119             : 
     120             : /*
     121             :   timegm() is a GNU function that might not be available everywhere.
     122             :   It's basically the inverse of gmtime() - you give it a struct tm,
     123             :   and get back a time_t.  It differs from mktime() in that it handles
     124             :   the case where the struct tm is UTC and the local environment isn't.
     125             : 
     126             :   Note, that this replacement implementation might not be thread-safe!
     127             : 
     128             :   Some BSDs don't handle the putenv("foo") case properly, so we use
     129             :   unsetenv if the platform has it to remove environment variables.
     130             : */
     131             : #ifndef HAVE_TIMEGM
     132             : time_t
     133             : timegm (struct tm *tm)
     134             : {
     135             : #ifdef HAVE_W32_SYSTEM
     136             :   /* This one is thread safe.  */
     137             :   SYSTEMTIME st;
     138             :   FILETIME ft;
     139             :   unsigned long long cnsecs;
     140             : 
     141             :   st.wYear   = tm->tm_year + 1900;
     142             :   st.wMonth  = tm->tm_mon  + 1;
     143             :   st.wDay    = tm->tm_mday;
     144             :   st.wHour   = tm->tm_hour;
     145             :   st.wMinute = tm->tm_min;
     146             :   st.wSecond = tm->tm_sec;
     147             :   st.wMilliseconds = 0; /* Not available.  */
     148             :   st.wDayOfWeek = 0;    /* Ignored.  */
     149             : 
     150             :   /* System time is UTC thus the conversion is pretty easy.  */
     151             :   if (!SystemTimeToFileTime (&st, &ft))
     152             :     {
     153             :       gpg_err_set_errno (EINVAL);
     154             :       return (time_t)(-1);
     155             :     }
     156             : 
     157             :   cnsecs = (((unsigned long long)ft.dwHighDateTime << 32)
     158             :             | ft.dwLowDateTime);
     159             :   cnsecs -= 116444736000000000ULL; /* The filetime epoch is 1601-01-01.  */
     160             :   return (time_t)(cnsecs / 10000000ULL);
     161             : 
     162             : #else /* (Non thread safe implementation!) */
     163             : 
     164             :   time_t answer;
     165             :   char *zone;
     166             : 
     167             :   zone=getenv("TZ");
     168             :   putenv("TZ=UTC");
     169             :   tzset();
     170             :   answer=mktime(tm);
     171             :   if(zone)
     172             :     {
     173             :       static char *old_zone;
     174             : 
     175             :       if (!old_zone)
     176             :         {
     177             :           old_zone = malloc(3+strlen(zone)+1);
     178             :           if (old_zone)
     179             :             {
     180             :               strcpy(old_zone,"TZ=");
     181             :               strcat(old_zone,zone);
     182             :             }
     183             :         }
     184             :       if (old_zone)
     185             :         putenv (old_zone);
     186             :     }
     187             :   else
     188             :     gnupg_unsetenv("TZ");
     189             : 
     190             :   tzset();
     191             :   return answer;
     192             : #endif
     193             : }
     194             : #endif /*!HAVE_TIMEGM*/

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