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 "kapplication.h"
00039 #include "ksavefile.h"
00040
00041 KSaveFile::KSaveFile(const QString &filename, int mode)
00042 : mTempFile(true)
00043 {
00044
00045
00046 QString real_filename = filename;
00047
00048 QFileInfo file_info(real_filename);
00049 int c=0;
00050 while(file_info.isSymLink() && ++c<6) {
00051 real_filename = file_info.readLink();
00052 file_info.setFile( real_filename );
00053 }
00054
00055
00056
00057
00058 if (!checkAccess(real_filename, W_OK))
00059 {
00060 mTempFile.setError(EACCES);
00061 return;
00062 }
00063
00064 if (mTempFile.create(real_filename, QString::fromLatin1(".new"), mode))
00065 {
00066 mFileName = real_filename;
00067
00068
00069
00070
00071 struct stat stat_buf;
00072 if ((stat(QFile::encodeName(real_filename), &stat_buf)==0)
00073 && (stat_buf.st_uid == getuid())
00074 && (stat_buf.st_gid == getgid()))
00075 {
00076 fchmod(mTempFile.handle() , stat_buf.st_mode);
00077 }
00078 }
00079 return;
00080 }
00081
00082 KSaveFile::~KSaveFile()
00083 {
00084 if (mTempFile.bOpen)
00085 close();
00086 }
00087
00088 QString
00089 KSaveFile::name() const
00090 {
00091 return mFileName;
00092 }
00093
00094 void
00095 KSaveFile::abort()
00096 {
00097 mTempFile.unlink();
00098 mTempFile.close();
00099 }
00100
00101 bool
00102 KSaveFile::close()
00103 {
00104 if (mTempFile.name().isEmpty())
00105 return false;
00106 if (!mTempFile.sync())
00107 {
00108 abort();
00109 return false;
00110 }
00111 if (mTempFile.close())
00112 {
00113 QDir dir;
00114 bool result = dir.rename( mTempFile.name(), mFileName);
00115 if ( result )
00116 {
00117 return true;
00118 }
00119 mTempFile.setError(errno);
00120 }
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 = open( filename, O_RDONLY);
00152 if (fd < 0)
00153 return false;
00154
00155 struct stat buff;
00156 if ( 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 ( 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 = 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 }
This file is part of the documentation for kdecore Library Version 3.3.0.