POSIX/Linux related changes to file_util....

base/file_util_linux.cc

Index: base/file_util_linux.cc
===================================================================
--- base/file_util_linux.cc	(revision 2056)
+++ base/file_util_linux.cc	(working copy)
@@ -4,7 +4,10 @@
 
 #include "base/file_util.h"
 
+#include <fcntl.h>
+
 #include <string>
+#include <vector>
 
 #include "base/logging.h"
 #include "base/string_util.h"
@@ -23,9 +26,49 @@
 }
 
 bool CopyFile(const std::wstring& from_path, const std::wstring& to_path) {
-  // TODO(erikkay): implement
-  NOTIMPLEMENTED();
-  return false;
+  int infile = open(WideToUTF8(from_path).c_str(), O_RDONLY);
+  if (infile < 0)
+    return false;
+  
+  int outfile = creat(WideToUTF8(to_path).c_str(), 0666);

[Dean McNamee, 2008/09/12 13:59:46]

Is this the right thing to do?  I would think we should either take the mode
from the file we're copying, or to use the umask, not to hardcode 0666.

[Erik does not do reviews, 2008/09/12 16:00:50]

My understanding is that both creat() and open() use the umask for you.  That's
why we're passing in 0666, so that we give full control to the user's umask.

+  if (outfile < 0) {
+    close(infile);
+    return false;
+  }
+
+  const size_t kBufferSize = 32768;

[Dean McNamee, 2008/09/12 13:59:46]

If this is 32k, it would be nice as 32 * 1024;

+  std::vector<char> buffer(kBufferSize);
+  bool result = true;
+
+  while (result) {
+    ssize_t bytes_read = read(infile, &buffer[0], buffer.size());
+    if (bytes_read < 0) {
+      result = false;
+      break;
+    }
+    if (bytes_read == 0)
+      break;
+    // Allow for partial writes
+    ssize_t bytes_written_per_read = 0;
+    do {
+      ssize_t bytes_written_partial = write(
+          outfile,
+          &buffer[bytes_written_per_read],
+          bytes_read - bytes_written_per_read);
+      if (bytes_written_partial < 0) {
+        result = false;
+        break;
+      }
+      bytes_written_per_read += bytes_written_partial;
+    } while (bytes_written_per_read < bytes_read);
+  }
+
+  if (close(infile) < 0)
+    result = false;
+  if (close(outfile) < 0)
+    result = false;
+
+  return result;
 }
 
 }  // namespace file_util