[libcxx-commits] [libcxx] [libc++] Fix `money_get::do_get` with huge input (PR #126273)

[Mark de Wever via libcxx-commits]

================
@@ -0,0 +1,113 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <locale>
+
+// class money_get<charT, InputIterator>
+
+// iter_type get(iter_type b, iter_type e, bool intl, ios_base& iob,
+//               ios_base::iostate& err, long double& v) const;
+
+#include <cassert>
+#include <cstddef>
+#include <ios>
+#include <locale>
+#include <streambuf>
+#include <string>
+
+#include "test_macros.h"
+#include "test_iterators.h"
+
+typedef std::money_get<char, cpp17_input_iterator<const char*> > Fn;
+
+class my_facet : public Fn {
+public:
+  explicit my_facet(std::size_t refs = 0) : Fn(refs) {}
+};
+
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+typedef std::money_get<wchar_t, cpp17_input_iterator<const wchar_t*> > Fw;
+
+class my_facetw : public Fw {
+public:
+  explicit my_facetw(std::size_t refs = 0) : Fw(refs) {}
+};
+#endif
+
+int main(int, char**) {
+  struct digit_result_case {
+    std::size_t digit;
+    long double result;
----------------
mordante wrote:

I like to see tests for small numbers too.

```suggestion
    long double big;
    long double small;
```
So in the loop we can do
```
        std::string v = "0.";
        v.append(digit_result_cases[i].digit, '0');
        v += "2";
```
and test that value too.

https://github.com/llvm/llvm-project/pull/126273