src/gromacs/utility/directoryenumerator.cpp

   1 /*
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  35 /*! \internal \file
  36  * \brief
  37  * Implements gmx::DirectoryEnumerator.
  38  *
  39  * \author Erik Lindahl (original C implementation)
  40  * \author Teemu Murtola <teemu.murtola@gmail.com> (C++ wrapper + errno handling)
  41  * \ingroup module_utility
  42  */
  43 #include "gmxpre.h"
  44
  45 #include "directoryenumerator.h"
  46
  47 #include "config.h"
  48
  49 #include <cerrno>
  50 #include <cstdio>
  51
  52 #include <algorithm>
  53 #include <string>
  54 #include <vector>
  55
  56 #if HAVE_DIRENT_H
  57 #include <dirent.h>
  58 #endif
  59 #if GMX_NATIVE_WINDOWS
  60 #include <io.h>
  61 #endif
  62
  63 #include "gromacs/utility/exceptions.h"
  64 #include "gromacs/utility/fatalerror.h"
  65 #include "gromacs/utility/futil.h"
  66 #include "gromacs/utility/gmxassert.h"
  67 #include "gromacs/utility/smalloc.h"
  68 #include "gromacs/utility/stringutil.h"
  69
  70 namespace gmx
  71 {
  72
  73 /********************************************************************
  74  * DirectoryEnumerator::Impl
  75  */
  76
  77 // TODO: Consider whether checking the return value of closing would be useful,
  78 // and what could we do if it fails?
  79 #if GMX_NATIVE_WINDOWS
  80 // TODO: Consider if Windows provides more error details through other APIs.
  81 class DirectoryEnumerator::Impl
  82 {
  83     public:
  84         static Impl *init(const char *dirname, bool bThrow)
  85         {
  86             std::string tmpname(dirname);
  87             // Remove possible trailing directory separator.
  88             // TODO: Use a method in gmx::Path instead.
  89             if (tmpname.back() == '/' || tmpname.back() == '\\')
  90             {
  91                 tmpname.pop_back();
  92             }
  93
  94             // Add wildcard.
  95             tmpname.append("/*");
  96
  97             errno = 0;
  98             _finddata_t finddata;
  99             intptr_t    handle = _findfirst(tmpname.c_str(), &finddata);
 100             if (handle < 0L)
 101             {
 102                 if (errno != ENOENT && bThrow)
 103                 {
 104                     const int         code    = errno;
 105                     const std::string message =
 106                         formatString("Failed to list files in directory '%s'",
 107                                      dirname);
 108                     GMX_THROW_WITH_ERRNO(FileIOError(message), "_findfirst", code);
 109                 }
 110                 return NULL;
 111             }
 112             return new Impl(handle, finddata);
 113         }
 114         Impl(intptr_t handle, _finddata_t finddata)
 115             : windows_handle(handle), finddata(finddata), bFirst_(true)
 116         {
 117         }
 118         ~Impl()
 119         {
 120             _findclose(windows_handle);
 121         }
 122
 123         bool nextFile(std::string *filename)
 124         {
 125             if (bFirst_)
 126             {
 127                 *filename = finddata.name;
 128                 bFirst_   = false;
 129                 return true;
 130             }
 131             else
 132             {
 133                 errno = 0;
 134                 if (_findnext(windows_handle, &finddata) != 0)
 135                 {
 136                     if (errno == 0 || errno == ENOENT)
 137                     {
 138                         filename->clear();
 139                         return false;
 140                     }
 141                     else
 142                     {
 143                         GMX_THROW_WITH_ERRNO(
 144                                 FileIOError("Failed to list files in a directory"),
 145                                 "_findnext", errno);
 146                     }
 147                 }
 148                 *filename = finddata.name;
 149                 return true;
 150             }
 151         }
 152
 153     private:
 154         intptr_t     windows_handle;
 155         _finddata_t  finddata;
 156         bool         bFirst_;
 157 };
 158 #elif HAVE_DIRENT_H
 159 class DirectoryEnumerator::Impl
 160 {
 161     public:
 162         static Impl *init(const char *dirname, bool bThrow)
 163         {
 164             errno       = 0;
 165             DIR *handle = opendir(dirname);
 166             if (handle == nullptr)
 167             {
 168                 if (bThrow)
 169                 {
 170                     const int         code    = errno;
 171                     const std::string message =
 172                         formatString("Failed to list files in directory '%s'",
 173                                      dirname);
 174                     GMX_THROW_WITH_ERRNO(FileIOError(message), "opendir", code);
 175                 }
 176                 return nullptr;
 177             }
 178             return new Impl(handle);
 179         }
 180         explicit Impl(DIR *handle) : dirent_handle(handle) {}
 181         ~Impl()
 182         {
 183             closedir(dirent_handle);
 184         }
 185
 186         bool nextFile(std::string *filename)
 187         {
 188             errno = 0;
 189             dirent *p = readdir(dirent_handle);
 190             if (p == nullptr)
 191             {
 192                 if (errno == 0)
 193                 {
 194                     // All the files have been found.
 195                     filename->clear();
 196                     return false;
 197                 }
 198                 else
 199                 {
 200                     GMX_THROW_WITH_ERRNO(
 201                             FileIOError("Failed to list files in a directory"),
 202                             "readdir", errno);
 203                 }
 204             }
 205             *filename = p->d_name;
 206             return true;
 207         }
 208
 209     private:
 210         DIR    *dirent_handle;
 211 };
 212 #else
 213 class DirectoryEnumerator::Impl
 214 {
 215     public:
 216         static Impl *init(const char * /*dirname*/, bool /*bThrow*/)
 217         {
 218             std::string message(
 219                     "Source compiled without POSIX dirent or Windows support "
 220                     "- cannot scan directories. In the very unlikely event "
 221                     "this is not a compile-time mistake you could consider "
 222                     "implementing support for your platform in "
 223                     "directoryenumerator.cpp, but contact the developers "
 224                     "to make sure it's really necessary!");
 225             GMX_THROW(NotImplementedError(message));
 226         }
 227
 228         bool nextFile(std::string * /*filename*/)
 229         {
 230             return false;
 231         }
 232 };
 233 #endif
 234
 235 /********************************************************************
 236  * DirectoryEnumerator
 237  */
 238
 239 // static
 240 std::vector<std::string>
 241 DirectoryEnumerator::enumerateFilesWithExtension(
 242         const char *dirname, const char *extension, bool bThrow)
 243 {
 244     std::vector<std::string> result;
 245     DirectoryEnumerator      dir(dirname, bThrow);
 246     std::string              nextName;
 247     while (dir.nextFile(&nextName))
 248     {
 249         if (debug)
 250         {
 251             std::fprintf(debug, "dir '%s' file '%s'\n",
 252                          dirname, nextName.c_str());
 253         }
 254         // TODO: What about case sensitivity?
 255         if (endsWith(nextName, extension))
 256         {
 257             result.push_back(nextName);
 258         }
 259     }
 260
 261     std::sort(result.begin(), result.end());
 262     return result;
 263 }
 264
 265
 266 DirectoryEnumerator::DirectoryEnumerator(const char *dirname, bool bThrow)
 267     : impl_(nullptr)
 268 {
 269     GMX_RELEASE_ASSERT(dirname != nullptr && dirname[0] != '\0',
 270                        "Attempted to open empty/null directory path");
 271     impl_.reset(Impl::init(dirname, bThrow));
 272 }
 273
 274 DirectoryEnumerator::DirectoryEnumerator(const std::string &dirname, bool bThrow)
 275     : impl_(nullptr)
 276 {
 277     GMX_RELEASE_ASSERT(!dirname.empty(),
 278                        "Attempted to open empty/null directory path");
 279     impl_.reset(Impl::init(dirname.c_str(), bThrow));
 280 }
 281
 282 DirectoryEnumerator::~DirectoryEnumerator()
 283 {
 284 }
 285
 286 bool DirectoryEnumerator::nextFile(std::string *filename)
 287 {
 288     if (impl_ == nullptr)
 289     {
 290         filename->clear();
 291         return false;
 292     }
 293     return impl_->nextFile(filename);
 294 }
 295
 296 } // namespace gmx