_fixup

Source/Engine/Platform/Linux/LinuxFileSystem.cpp

@@ -165,6 +165,78 @@ bool LinuxFileSystem::ShowFileExplorer(const StringView& path)
     return false;
 }
 
+bool LinuxFileSystem::CopyFile(const StringView& dst, const StringView& src)
+{
+    const StringAsUTF8<> srcANSI(*src, src.Length());
+    const StringAsUTF8<> dstANSI(*dst, dst.Length());
+
+    int srcFile, dstFile;
+    char buffer[4096];
+    ssize_t readSize;
+    int cachedError;
+
+    srcFile = open(srcANSI.Get(), O_RDONLY);
+    if (srcFile < 0)
+        return true;
+    dstFile = open(dstANSI.Get(), O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
+    if (dstFile < 0)
+        goto out_error;
+
+    // first try the kernel method
+    struct stat statBuf;
+    fstat(srcFile, &statBuf);
+    readSize = 1;
+    while (readSize > 0)
+    {
+        readSize = sendfile(dstFile, srcFile, 0, statBuf.st_size);
+    }
+    // sendfile could fail for example if the input file is not nmap'able
+    // in this case we fall back to the read/write loop
+    if (readSize < 0)
+    {
+        while (readSize = read(srcFile, buffer, sizeof(buffer)), readSize > 0)
+        {
+            char* ptr = buffer;
+            ssize_t writeSize;
+
+            do
+            {
+                writeSize = write(dstFile, ptr, readSize);
+                if (writeSize >= 0)
+                {
+                    readSize -= writeSize;
+                    ptr += writeSize;
+                }
+                else if (errno != EINTR)
+                {
+                    goto out_error;
+                }
+            } while (readSize > 0);
+        }
+    }
+
+    if (readSize == 0)
+    {
+        if (close(dstFile) < 0)
+        {
+            dstFile = -1;
+            goto out_error;
+        }
+        close(srcFile);
+
+        // Success
+        return false;
+    }
+
+    out_error:
+        cachedError = errno;
+    close(srcFile);
+    if (dstFile >= 0)
+        close(dstFile);
+    errno = cachedError;
+    return true;
+}
+
 bool LinuxFileSystem::MoveFileToRecycleBin(const StringView& path)
 {
     String trashDir;