replace stat with std::filesystem

Signed-off-by: Rosen Penev <rosenp@gmail.com>

samples/geotag.cpp

@@ -20,8 +20,6 @@ namespace fs = std::experimental::filesystem;
 
 #ifdef _WIN32
 #include <windows.h>
-char* realpath(const char* file, char* path);
-#define lstat stat
 #if _MSC_VER < 1400
 #define strcpy_s(d, l, s) strcpy(d, s)
 #define strcat_s(d, l, s) strcat(d, s)
@@ -464,8 +462,6 @@ bool readDir(const char* path, Options& options) {
     // print all the files and directories within directory
     while ((ent = readdir(dir)) != nullptr) {
       std::string pathName = makePath(path, ent->d_name);
-      struct stat buf;
-      lstat(path, &buf);
       if (ent->d_name[0] != '.') {
         // printf("reading %s => %s\n",ent->d_name,pathName.c_str());
         if (getFileType(pathName, options) == typeImage) {

src/basicio.cpp

@@ -20,7 +20,6 @@
 
 // + standard includes
 #include <fcntl.h>  // _O_BINARY in FileIo::FileIo
-#include <sys/stat.h>  // for stat, chmod
 
 #if __has_include(<sys/mman.h>)
 #include <sys/mman.h>  // for mmap and munmap
@@ -37,7 +36,6 @@
 #endif
 
 #ifdef _WIN32
-using mode_t = unsigned short;
 #include <io.h>
 #include <windows.h>
 #endif
@@ -101,8 +99,8 @@ class FileIo::Impl {
   // TYPES
   //! Simple struct stat wrapper for internal use
   struct StructStat {
-    mode_t st_mode{0};  //!< Permissions
-    off_t st_size{0};   //!< Size
+    fs::perms st_mode{};       //!< Permissions
+    std::uintmax_t st_size{};  //!< Size
   };
   // #endif
   // METHODS
@@ -181,13 +179,13 @@ int FileIo::Impl::switchMode(OpMode opMode) {
 }  // FileIo::Impl::switchMode
 
 int FileIo::Impl::stat(StructStat& buf) const {
-  struct stat st;
-  auto ret = ::stat(path_.c_str(), &st);
-  if (ret == 0) {
-    buf.st_size = st.st_size;
-    buf.st_mode = st.st_mode;
+  try {
+    buf.st_size = fs::file_size(path_);
+    buf.st_mode = fs::status(path_).permissions();
+    return 0;
+  } catch (const fs::filesystem_error&) {
+    return -1;
   }
-  return ret;
 }  // FileIo::Impl::stat
 
 FileIo::FileIo(const std::string& path) : p_(std::make_unique<Impl>(path)) {
@@ -356,8 +354,8 @@ void FileIo::transfer(BasicIo& src) {
     close();
 
     bool statOk = true;
-    mode_t origStMode = 0;
-    auto pf = path().c_str();
+    fs::perms origStMode = {};
+    auto pf = path();
 
     Impl::StructStat buf1;
     if (p_->stat(buf1) == -1) {
@@ -372,14 +370,15 @@ void FileIo::transfer(BasicIo& src) {
       // that file has been opened with FILE_SHARE_DELETE by another process,
       // like a virus scanner or disk indexer
       // (see also http://stackoverflow.com/a/11023068)
-      auto ret = ReplaceFileA(pf, fileIo->path().c_str(), nullptr, REPLACEFILE_IGNORE_MERGE_ERRORS, nullptr, nullptr);
+      auto ret =
+          ReplaceFileA(pf.c_str(), fileIo->path().c_str(), nullptr, REPLACEFILE_IGNORE_MERGE_ERRORS, nullptr, nullptr);
       if (ret == 0) {
         if (GetLastError() != ERROR_FILE_NOT_FOUND)
           throw Error(ErrorCode::kerFileRenameFailed, fileIo->path(), pf, strError());
         fs::rename(fileIo->path(), pf);
         fs::remove(fileIo->path());
       } else {
-        if (fileExists(pf) && ::remove(pf) != 0)
+        if (fileExists(pf) && fs::remove(pf) != 0)
           throw Error(ErrorCode::kerCallFailed, pf, strError(), "fs::remove");
         fs::rename(fileIo->path(), pf);
         fs::remove(fileIo->path());
@@ -392,15 +391,10 @@ void FileIo::transfer(BasicIo& src) {
       fs::remove(fileIo->path());
 #endif
       // Check permissions of new file
-      struct stat buf2;
-      if (statOk && ::stat(pf, &buf2) == -1) {
-        statOk = false;
-#ifndef SUPPRESS_WARNINGS
-        EXV_WARNING << Error(ErrorCode::kerCallFailed, pf, strError(), "::stat") << "\n";
-#endif
-      }
+      auto newStMode = fs::status(pf).permissions();
       // Set original file permissions
-      if (statOk && origStMode != buf2.st_mode && ::chmod(pf, origStMode) == -1) {
+      if (statOk && origStMode != newStMode) {
+        fs::permissions(pf, origStMode);
 #ifndef SUPPRESS_WARNINGS
         EXV_WARNING << Error(ErrorCode::kerCallFailed, pf, strError(), "::chmod") << "\n";
 #endif
@@ -1718,11 +1712,7 @@ DataBuf readFile(const std::string& path) {
   if (file.open("rb") != 0) {
     throw Error(ErrorCode::kerFileOpenFailed, path, "rb", strError());
   }
-  struct stat st;
-  if (0 != ::stat(path.c_str(), &st)) {
-    throw Error(ErrorCode::kerCallFailed, path, strError(), "::stat");
-  }
-  DataBuf buf(st.st_size);
+  DataBuf buf(fs::file_size(path));
   if (file.read(buf.data(), buf.size()) != buf.size()) {
     throw Error(ErrorCode::kerCallFailed, path, strError(), "FileIo::read");
   }

src/futils.cpp

@@ -35,7 +35,7 @@ namespace fs = std::experimental::filesystem;
 #endif
 
 #if __has_include(<unistd.h>)
-#include <unistd.h>  // for stat()
+#include <unistd.h>  // for getpid()
 #endif
 
 #if defined(__FreeBSD__)