shell/source/unix/sysshell/recently_used_file.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include "recently_used_file.hxx"
  21 #include <rtl/ustring.hxx>
  22 #include <osl/process.h>
  23 #include <osl/security.hxx>
  24 #include <osl/thread.h>
  25 #include <osl/file.hxx>
  26
  27 #include <sys/file.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <unistd.h>
  32
  33 const OUString RECENTLY_USED_FILE_NAME(".recently-used");
  34 const OUString SLASH("/");
  35
  36 namespace /* private */ {
  37
  38 inline void ensure_final_slash(/*inout*/ OUString& path)
  39 {
  40     if (!path.isEmpty() &&
  41         (SLASH.pData->buffer[0] != path.pData->buffer[path.getLength() - 1]))
  42         path += SLASH;
  43 }
  44
  45 } // namespace private
  46
  47
  48 recently_used_file::recently_used_file() :
  49     file_(NULL)
  50 {
  51     osl::Security sec;
  52     OUString homedir_url;
  53
  54     if (sec.getHomeDir(homedir_url))
  55     {
  56         OUString homedir;
  57         osl::FileBase::getSystemPathFromFileURL(homedir_url, homedir);
  58
  59         OUString rufn = homedir;
  60         ensure_final_slash(rufn);
  61         rufn += RECENTLY_USED_FILE_NAME;
  62
  63         OString tmp =
  64             OUStringToOString(rufn, osl_getThreadTextEncoding());
  65
  66         int fd = open(tmp.getStr(), O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
  67         if (fd != -1) {
  68             file_ = fdopen(fd, "w+");
  69             if (file_ == 0) {
  70                 close(fd);
  71             }
  72         }
  73
  74         if (NULL == file_)
  75             throw "I/O error opening ~/.recently-used";
  76
  77         if (lockf(fileno(file_), F_LOCK, 0) != 0)
  78         {
  79             fclose(file_);
  80             throw "Cannot lock ~/.recently-used";
  81         }
  82     }
  83     else
  84         throw "Cannot determine user home directory";
  85 }
  86
  87
  88 recently_used_file::~recently_used_file()
  89 {
  90     int ret = lockf(fileno(file_), F_ULOCK, 0);
  91     SAL_WARN_IF(ret != 0, "shell", "cannot unlock recently unused file");
  92     fclose(file_);
  93 }
  94
  95
  96 void recently_used_file::reset() const
  97 {
  98     rewind(file_);
  99 }
 100
 101
 102 void recently_used_file::truncate(off_t length)
 103 {
 104     if (ftruncate(fileno(file_), length) == -1)
 105         throw "I/O error: ftruncate failed";
 106 }
 107
 108
 109 size_t recently_used_file::read(char* buffer, size_t size) const
 110 {
 111     size_t  r = fread(buffer, sizeof(char), size, file_);
 112
 113     if ((r < size) && ferror(file_))
 114         throw "I/O error: read failed";
 115
 116     return r;
 117 }
 118
 119
 120 void recently_used_file::write(const char* buffer, size_t size) const
 121 {
 122     if (size != fwrite(buffer, sizeof(char), size, file_))
 123         throw "I/O error: write failed";
 124 }
 125
 126
 127 bool recently_used_file::eof() const
 128 {
 129     return feof(file_);
 130 }
 131
 132
 133
 134
 135 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */