summaryrefslogtreecommitdiffstats
path: root/tdecore/ksavefile.cpp
blob: d9b8867af6af80f9208de5dc1aeb55631146e960 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/*
  This file is part of the KDE libraries
  Copyright (c) 1999 Waldo Bastian <bastian@kde.org>

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License version 2 as published by the Free Software Foundation.

  This library 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
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; see the file COPYING.LIB.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301, USA.
*/

#include <config.h>

#include <sys/types.h>

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#include <unistd.h>
#include <fcntl.h>

#ifdef HAVE_TEST
#include <test.h>
#endif

#include <tqdatetime.h>
#include <tqdir.h>

#include <kde_file.h>
#include "tdeapplication.h"
#include "ksavefile.h"
#include "kstandarddirs.h"

KSaveFile::KSaveFile(const TQString &filename, int mode)
 : mTempFile(true)
{
   // follow symbolic link, if any
   TQString real_filename = TDEStandardDirs::realFilePath(filename);

   // we only check here if the directory can be written to
   // the actual filename isn't written to, but replaced later
   // with the contents of our tempfile
   if (!checkAccess(real_filename, W_OK))
   {
      mTempFile.setError(EACCES);
      return;
   }

   if (mTempFile.create(real_filename, TQString::fromLatin1(".new"), mode))
   {
      mFileName = real_filename; // Set filename upon success

      // if we're overwriting an existing file, ensure temp file's
      // permissions are the same as existing file so the existing
      // file's permissions are preserved
      KDE_struct_stat stat_buf;
      if (KDE_stat(TQFile::encodeName(real_filename), &stat_buf)==0)
      {
         // But only if we own the existing file
         if (stat_buf.st_uid == getuid())
         {
            bool changePermission = true;
            if (stat_buf.st_gid != getgid())
      {
               if (fchown(mTempFile.handle(), (uid_t) -1, stat_buf.st_gid) != 0)
               {
                  // Use standard permission if we can't set the group
                  changePermission = false;
               }
            }
            if (changePermission)
               fchmod(mTempFile.handle(), stat_buf.st_mode);
         }
      }
   }
}

KSaveFile::~KSaveFile()
{
   if (mTempFile.bOpen)
      close(); // Close if we were still open
}

TQString
KSaveFile::name() const
{
   return mFileName;
}

void
KSaveFile::abort()
{
   mTempFile.close();
   mTempFile.unlink();
}

bool
KSaveFile::close()
{
   if (mTempFile.name().isEmpty() || mTempFile.handle()==-1)
      return false; // Save was aborted already
   if (!mTempFile.sync())
   {
      abort();
      return false;
   }
   if (mTempFile.close())
   {
      if (0==KDE_rename(TQFile::encodeName(mTempFile.name()), TQFile::encodeName(mFileName)))
         return true; // Success!
      mTempFile.setError(errno);
   }
   // Something went wrong, make sure to delete the interim file.
   mTempFile.unlink();
   return false;
}

static int
write_all(int fd, const char *buf, size_t len)
{
   while (len > 0)
   {
      int written = write(fd, buf, len);
      if (written < 0)
      {
          if (errno == EINTR)
             continue;
          return -1;
      }
      buf += written;
      len -= written;
   }
   return 0;
}

bool KSaveFile::backupFile( const TQString& qFilename, const TQString& backupDir,
                            const TQString& backupExtension)
{
   TQCString cFilename = TQFile::encodeName(qFilename);
   const char *filename = cFilename.data();

   int fd = KDE_open( filename, O_RDONLY );
   if (fd < 0)
      return false;

   KDE_struct_stat buff;
   if ( KDE_fstat( fd, &buff) < 0 )
   {
      ::close( fd );
      return false;
   }

   TQCString cBackup;
   if ( backupDir.isEmpty() )
       cBackup = cFilename;
   else
   {
       TQCString nameOnly;
       int slash = cFilename.findRev('/');
       if (slash < 0)
	   nameOnly = cFilename;
       else
	   nameOnly = cFilename.mid(slash + 1);
       cBackup = TQFile::encodeName(backupDir);
       if ( backupDir[backupDir.length()-1] != (TQChar)'/' )
           cBackup += '/';
       cBackup += nameOnly;
   }
   cBackup += TQFile::encodeName(backupExtension);
   const char *backup = cBackup.data();
   int permissions = buff.st_mode & 07777;

   if ( KDE_stat( backup, &buff) == 0)
   {
      if ( unlink( backup ) != 0 )
      {
         ::close(fd);
         return false;
      }
   }

   mode_t old_umask = umask(0);
   int fd2 = KDE_open( backup, O_WRONLY | O_CREAT | O_EXCL, permissions | S_IWUSR);
   umask(old_umask);

   if ( fd2 < 0 )
   {
      ::close(fd);
      return false;
   }

    char buffer[ 32*1024 ];

    while( 1 )
    {
       int n = ::read( fd, buffer, 32*1024 );
       if (n == -1)
       {
          if (errno == EINTR)
              continue;
          ::close(fd);
          ::close(fd2);
          return false;
       }
       if (n == 0)
          break; // Finished

       if (write_all( fd2, buffer, n))
       {
          ::close(fd);
          ::close(fd2);
          return false;
       }
    }

    ::close( fd );

    if (::close(fd2))
        return false;
    return true;
}