From 34eb75ce9884b8ebd6520504c1dfc9b623a0b227 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Sat, 4 May 2024 18:02:47 +0300
Subject: [PATCH] Add test_to_chars.cpp

---
 test/CMakeLists.txt    |  1 +
 test/Jamfile.v2        |  1 +
 test/test_to_chars.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 test/test_to_chars.cpp

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index f1d1bc1c..73722553 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -23,6 +23,7 @@ boost_test(TYPE run SOURCES test_comparison.cpp COMPILE_DEFINITIONS BOOST_UUID_N
 boost_test(TYPE run SOURCES test_include1.cpp test_include2.cpp)
 
 boost_test(TYPE run SOURCES test_io.cpp LINK_LIBRARIES Boost::lexical_cast Boost::predef)
+boost_test(TYPE run SOURCES test_to_chars.cpp)
 
 boost_test(TYPE run SOURCES test_uuid_clock.cpp)
 
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index a7ec2211..81e2e34b 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -67,6 +67,7 @@ run test_comparison.cpp : : : <define>BOOST_UUID_NO_SIMD <define>BOOST_UUID_REPO
 # test uuid_io.hpp
 
 run test_io.cpp ;
+run test_to_chars.cpp ;
 
 # test uuid_clock
 
diff --git a/test/test_to_chars.cpp b/test/test_to_chars.cpp
new file mode 100644
index 00000000..c03881c6
--- /dev/null
+++ b/test/test_to_chars.cpp
@@ -0,0 +1,63 @@
+// Copyright 2009 Andy Tompkins 2009
+// Copyright 2024 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/uuid/uuid.hpp>
+#include <boost/uuid/uuid_io.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <string>
+#include <algorithm>
+
+using namespace boost::uuids;
+
+template<class Ch> void test( uuid const& u, Ch const* expected )
+{
+    int const N = 56;
+
+    for( int n = 0; n < 36; ++n )
+    {
+        Ch buffer[ N ];
+
+        std::fill( buffer + 0, buffer + N, '@' );
+
+        // insufficient buffer size; must fail
+        BOOST_TEST_NOT( to_chars( u, buffer + 0, buffer + n ) );
+
+        // make sure nothing is written beyond the end
+        BOOST_TEST( std::basic_string<Ch>( buffer + n, buffer + N ) == std::basic_string<Ch>( N - n, '@' ) );
+    }
+
+    for( int n = 36; n < 48; ++n )
+    {
+        Ch buffer[ N ];
+
+        std::fill( buffer + 0, buffer + N, '@' );
+
+        // sufficient buffer size; must succeed
+        BOOST_TEST( to_chars( u, buffer + 0, buffer + n ) );
+
+        // check that the correct string is produced
+        BOOST_TEST( std::basic_string<Ch>( buffer + 0, buffer + 36 ) == std::basic_string<Ch>( expected ) );
+
+        // make sure nothing is written beyond the end
+        BOOST_TEST( std::basic_string<Ch>( buffer + n, buffer + N ) == std::basic_string<Ch>( N - n, '@' ) );
+    }
+}
+
+int main()
+{
+    uuid const u1 = {{ 0 }};
+    uuid const u2 = {{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }};
+    uuid const u3 = {{ 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef }};
+
+    test( u1, "00000000-0000-0000-0000-000000000000" );
+    test( u2, "00010203-0405-0607-0809-0a0b0c0d0e0f" );
+    test( u3, "12345678-90ab-cdef-1234-567890abcdef" );
+
+    test( u1, L"00000000-0000-0000-0000-000000000000" );
+    test( u2, L"00010203-0405-0607-0809-0a0b0c0d0e0f" );
+    test( u3, L"12345678-90ab-cdef-1234-567890abcdef" );
+
+    return boost::report_errors();
+}