src/support/fs_extras.cpp

   1 // -*- C++ -*-
   2 /* \file fs_extras.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11
  12 #include <config.h>
  13
  14 #include "fs_extras.h"
  15
  16 #include <boost/filesystem/config.hpp>
  17 #include <boost/detail/workaround.hpp>
  18 #include <boost/throw_exception.hpp>
  19
  20 #ifdef HAVE_SYS_TYPES_H
  21 # include <sys/types.h>
  22 #endif
  23 #ifdef HAVE_SYS_STAT_H
  24 # include <sys/stat.h>
  25 #endif
  26 #include <cerrno>
  27 #include <fcntl.h>
  28
  29
  30 // BOOST_POSIX or BOOST_WINDOWS specify which API to use.
  31 # if !defined( BOOST_WINDOWS ) && !defined( BOOST_POSIX )
  32 #   if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__)
  33 #     define BOOST_WINDOWS
  34 #   else
  35 #     define BOOST_POSIX
  36 #   endif
  37 # endif
  38
  39 #if defined (BOOST_WINDOWS)
  40 # define WIN32_LEAN_AND_MEAN
  41 # include <windows.h>
  42 #endif
  43
  44 namespace fs = boost::filesystem;
  45
  46 namespace boost {
  47 namespace filesystem {
  48
  49 bool is_readable(path const & ph)
  50 {
  51 #ifdef BOOST_POSIX
  52         return ::access(ph.string().c_str(), R_OK) == 0;
  53 #endif
  54 #ifdef BOOST_WINDOWS
  55         DWORD const attr = ::GetFileAttributes(ph.string().c_str());
  56         return attr != INVALID_FILE_ATTRIBUTES &&
  57                 (attr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY;
  58 #endif
  59 }
  60
  61
  62 bool is_writable(path const & ph)
  63 {
  64 #ifdef BOOST_POSIX
  65         return ::access(ph.string().c_str(), W_OK) == 0;
  66 #endif
  67 #ifdef BOOST_WINDOWS
  68         DWORD const attr = ::GetFileAttributes(ph.string().c_str());
  69         if (attr != INVALID_FILE_ATTRIBUTES &&
  70             (attr & FILE_ATTRIBUTE_READONLY) != 0) {
  71                 // Read-only - no write access
  72                 return false;
  73         }
  74         return attr != INVALID_FILE_ATTRIBUTES &&
  75                 (attr & FILE_ATTRIBUTE_DIRECTORY) != FILE_ATTRIBUTE_DIRECTORY;
  76 #endif
  77 }
  78
  79
  80 bool is_readonly(path const & ph)
  81 {
  82 #ifdef BOOST_POSIX
  83         return is_readable(ph) && !is_writable(ph);
  84 #endif
  85 #ifdef BOOST_WINDOWS
  86         DWORD const attr = ::GetFileAttributes(ph.string().c_str());
  87         return (attr != INVALID_FILE_ATTRIBUTES
  88                 && (attr & FILE_ATTRIBUTE_READONLY));
  89 #endif
  90 }
  91
  92
  93 void copy_file(path const & source, path const & target, bool noclobber)
  94 {
  95
  96 #ifdef BOOST_POSIX
  97         int const infile = ::open(source.string().c_str(), O_RDONLY);
  98         if (infile == -1) {
  99                 boost::throw_exception(
 100                         filesystem_path_error(
 101                                 "boost::filesystem::copy_file",
 102                                 source, target,
 103                                 fs::lookup_errno(errno)));
 104         }
 105
 106                 struct stat source_stat;
 107                 int const ret = ::fstat(infile, &source_stat);
 108                 if (ret == -1) {
 109                 int err = errno;
 110                 ::close(infile);
 111                 boost::throw_exception(filesystem_path_error(
 112                            "boost::filesystem::copy_file",
 113                            source, target,
 114                            fs::lookup_errno(err)));
 115         }
 116
 117         int const flags = O_WRONLY | O_CREAT | (noclobber ? O_EXCL : O_TRUNC);
 118
 119         int const outfile = ::open(target.string().c_str(), flags, source_stat.st_mode);
 120         if (outfile == -1) {
 121                 int err = errno;
 122                 ::close(infile);
 123                 boost::throw_exception(
 124                         filesystem_path_error(
 125                                 "boost::filesystem::copy_file",
 126                                 source, target,
 127                                 fs::lookup_errno(err)));
 128         }
 129
 130         std::size_t const buf_sz = 32768;
 131         char buf[buf_sz];
 132         ssize_t in = -1;
 133         ssize_t out = -1;
 134
 135         while (true) {
 136                 in = ::read(infile, buf, buf_sz);
 137                 if (in == -1) {
 138                         break;
 139                 } else if (in == 0) {
 140                         break;
 141                 } else {
 142                         out = ::write(outfile, buf, in);
 143                         if (out == -1) {
 144                                 break;
 145                         }
 146                 }
 147         }
 148
 149         int err = errno;
 150
 151         ::close(infile);
 152         ::close(outfile);
 153
 154         if (in == -1 || out == -1)
 155                 boost::throw_exception(
 156                         filesystem_path_error(
 157                                 "boost::filesystem::copy_file",
 158                                 source, target,
 159                                 fs::lookup_errno(err)));
 160 #endif
 161 #ifdef BOOST_WINDOWS
 162         if (::CopyFile(source.string().c_str(), target.string().c_str(), noclobber) == 0) {
 163                 // CopyFile is probably not setting errno so this is most
 164                 // likely wrong.
 165                 boost::throw_exception(
 166                         filesystem_path_error(
 167                                 "boost::filesystem::copy_file",
 168                                 source, target,
 169                                 fs::lookup_error_code(errno)));
 170         }
 171 #endif
 172 }
 173
 174 }
 175 }