Backport: Move UniqueStringCopy into its own source file UniqueString.cxx to hide the implementation.

Backport of changeset 7402:751b76b567f9, but with an alternative to C++17's
string_view.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/UniqueString.cxx b/src/UniqueString.cxx
new file mode 100644
index 000000000..dcbdc441c
--- /dev/null
+++ b/src/UniqueString.cxx
@@ -0,0 +1,28 @@
+// Scintilla source code edit control
+/** @file UniqueString.cxx
+ ** Define an allocator for UniqueString.
+ **/
+// Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#include <cstring>
+#include <algorithm>
+#include <memory>
+
+#include "UniqueString.h"
+
+namespace Scintilla {
+
+/// Equivalent to strdup but produces a std::unique_ptr<const char[]> allocation to go
+/// into collections.
+UniqueString UniqueStringCopy(const char *text) {
+	if (!text) {
+		return UniqueString();
+	}
+	const size_t len = strlen(text);
+	std::unique_ptr<char[]> upcNew(new char[len + 1]);
+	memcpy(&upcNew[0], text, len + 1);
+	return UniqueString(upcNew.release());
+}
+
+}