KDECore
ksavefile.cpp
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00020 #include <config.h>
00021
00022 #include <sys/types.h>
00023
00024 #ifdef HAVE_SYS_STAT_H
00025 #include <sys/stat.h>
00026 #endif
00027
00028 #include <unistd.h>
00029 #include <fcntl.h>
00030
00031 #ifdef HAVE_TEST
00032 #include <test.h>
00033 #endif
00034
00035 #include <qdatetime.h>
00036 #include <qdir.h>
00037
00038 #include <kde_file.h>
00039 #include "kapplication.h"
00040 #include "ksavefile.h"
00041 #include "kstandarddirs.h"
00042
00043 KSaveFile::KSaveFile(const QString &filename, int mode)
00044 : mTempFile(true)
00045 {
00046
00047 QString real_filename = KStandardDirs::realFilePath(filename);
00048
00049
00050
00051
00052 if (!checkAccess(real_filename, W_OK))
00053 {
00054 mTempFile.setError(EACCES);
00055 return;
00056 }
00057
00058 if (mTempFile.create(real_filename, QString::fromLatin1(".new"), mode))
00059 {
00060 mFileName = real_filename;
00061
00062
00063
00064
00065 KDE_struct_stat stat_buf;
00066 if (KDE_stat(QFile::encodeName(real_filename), &stat_buf)==0)
00067 {
00068
00069 if (stat_buf.st_uid == getuid())
00070 {
00071 bool changePermission = true;
00072 if (stat_buf.st_gid != getgid())
00073 {
00074 if (fchown(mTempFile.handle(), (uid_t) -1, stat_buf.st_gid) != 0)
00075 {
00076
00077 changePermission = false;
00078 }
00079 }
00080 if (changePermission)
00081 fchmod(mTempFile.handle(), stat_buf.st_mode);
00082 }
00083 }
00084 }
00085 }
00086
00087 KSaveFile::~KSaveFile()
00088 {
00089 if (mTempFile.bOpen)
00090 close();
00091 }
00092
00093 QString
00094 KSaveFile::name() const
00095 {
00096 return mFileName;
00097 }
00098
00099 void
00100 KSaveFile::abort()
00101 {
00102 mTempFile.close();
00103 mTempFile.unlink();
00104 }
00105
00106 bool
00107 KSaveFile::close()
00108 {
00109 if (mTempFile.name().isEmpty() || mTempFile.handle()==-1)
00110 return false;
00111 if (!mTempFile.sync())
00112 {
00113 abort();
00114 return false;
00115 }
00116 if (mTempFile.close())
00117 {
00118 if (0==KDE_rename(QFile::encodeName(mTempFile.name()), QFile::encodeName(mFileName)))
00119 return true;
00120 mTempFile.setError(errno);
00121 }
00122
00123 mTempFile.unlink();
00124 return false;
00125 }
00126
00127 static int
00128 write_all(int fd, const char *buf, size_t len)
00129 {
00130 while (len > 0)
00131 {
00132 int written = write(fd, buf, len);
00133 if (written < 0)
00134 {
00135 if (errno == EINTR)
00136 continue;
00137 return -1;
00138 }
00139 buf += written;
00140 len -= written;
00141 }
00142 return 0;
00143 }
00144
00145 bool KSaveFile::backupFile( const QString& qFilename, const QString& backupDir,
00146 const QString& backupExtension)
00147 {
00148 QCString cFilename = QFile::encodeName(qFilename);
00149 const char *filename = cFilename.data();
00150
00151 int fd = KDE_open( filename, O_RDONLY );
00152 if (fd < 0)
00153 return false;
00154
00155 KDE_struct_stat buff;
00156 if ( KDE_fstat( fd, &buff) < 0 )
00157 {
00158 ::close( fd );
00159 return false;
00160 }
00161
00162 QCString cBackup;
00163 if ( backupDir.isEmpty() )
00164 cBackup = cFilename;
00165 else
00166 {
00167 QCString nameOnly;
00168 int slash = cFilename.findRev('/');
00169 if (slash < 0)
00170 nameOnly = cFilename;
00171 else
00172 nameOnly = cFilename.mid(slash + 1);
00173 cBackup = QFile::encodeName(backupDir);
00174 if ( backupDir[backupDir.length()-1] != '/' )
00175 cBackup += '/';
00176 cBackup += nameOnly;
00177 }
00178 cBackup += QFile::encodeName(backupExtension);
00179 const char *backup = cBackup.data();
00180 int permissions = buff.st_mode & 07777;
00181
00182 if ( KDE_stat( backup, &buff) == 0)
00183 {
00184 if ( unlink( backup ) != 0 )
00185 {
00186 ::close(fd);
00187 return false;
00188 }
00189 }
00190
00191 mode_t old_umask = umask(0);
00192 int fd2 = KDE_open( backup, O_WRONLY | O_CREAT | O_EXCL, permissions | S_IWUSR);
00193 umask(old_umask);
00194
00195 if ( fd2 < 0 )
00196 {
00197 ::close(fd);
00198 return false;
00199 }
00200
00201 char buffer[ 32*1024 ];
00202
00203 while( 1 )
00204 {
00205 int n = ::read( fd, buffer, 32*1024 );
00206 if (n == -1)
00207 {
00208 if (errno == EINTR)
00209 continue;
00210 ::close(fd);
00211 ::close(fd2);
00212 return false;
00213 }
00214 if (n == 0)
00215 break;
00216
00217 if (write_all( fd2, buffer, n))
00218 {
00219 ::close(fd);
00220 ::close(fd2);
00221 return false;
00222 }
00223 }
00224
00225 ::close( fd );
00226
00227 if (::close(fd2))
00228 return false;
00229 return true;
00230 }