X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FUnix%2FPathV2.inc;h=03ff28367e44c5e653f6080e5e89e43aaec714f5;hb=0eeca440469e23f2db2bea3d7b136f0f95f6ff1d;hp=80e75ecbf5a033a3b0065802bdbaf2829fffafe4;hpb=da7c1cab8c083e3370cc94a23bc396cd75b7f2a7;p=oota-llvm.git

diff --git a/lib/Support/Unix/PathV2.inc b/lib/Support/Unix/PathV2.inc
index 80e75ecbf5a..03ff28367e4 100644
--- a/lib/Support/Unix/PathV2.inc
+++ b/lib/Support/Unix/PathV2.inc
@@ -230,8 +230,17 @@ error_code rename(const Twine &from, const Twine &to) {
   StringRef f = from.toNullTerminatedStringRef(from_storage);
   StringRef t = to.toNullTerminatedStringRef(to_storage);
 
-  if (::rename(f.begin(), t.begin()) == -1)
-    return error_code(errno, system_category());
+  if (::rename(f.begin(), t.begin()) == -1) {
+    // If it's a cross device link, copy then delete, otherwise return the error
+    if (errno == EXDEV) {
+      if (error_code ec = copy_file(from, to, copy_option::overwrite_if_exists))
+        return ec;
+      bool Existed;
+      if (error_code ec = remove(from, Existed))
+        return ec;
+    } else
+      return error_code(errno, system_category());
+  }
 
   return success;
 }
@@ -462,6 +471,37 @@ error_code directory_iterator_increment(directory_iterator& it) {
   return success;
 }
 
+error_code get_magic(const Twine &path, uint32_t len,
+                     SmallVectorImpl<char> &result) {
+  SmallString<128> PathStorage;
+  StringRef Path = path.toNullTerminatedStringRef(PathStorage);
+  result.set_size(0);
+
+  // Open path.
+  std::FILE *file = std::fopen(Path.data(), "rb");
+  if (file == 0)
+    return error_code(errno, system_category());
+
+  // Reserve storage.
+  result.reserve(len);
+
+  // Read magic!
+  size_t size = std::fread(result.data(), 1, len, file);
+  if (std::ferror(file) != 0) {
+    std::fclose(file);
+    return error_code(errno, system_category());
+  } else if (size != result.size()) {
+    if (std::feof(file) != 0) {
+      std::fclose(file);
+      result.set_size(size);
+      return make_error_code(errc::value_too_large);
+    }
+  }
+  std::fclose(file);
+  result.set_size(len);
+  return success;
+}
+
 } // end namespace fs
 } // end namespace sys
 } // end namespace llvm