From e9d8f08561e9989aee2d6abe2b10d2f72fb2c7cf Mon Sep 17 00:00:00 2001
From: badaix <johannes.pohl@badaix.de>
Date: Tue, 13 Mar 2018 07:47:40 +0100
Subject: [PATCH] Fix compilation error on Android NDK level < 21

---
 common/json.hpp    |  4 ++--
 common/strCompat.h | 13 +++++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/common/json.hpp b/common/json.hpp
index 42cf577e..c6c1c423 100644
--- a/common/json.hpp
+++ b/common/json.hpp
@@ -1948,7 +1948,7 @@ class lexer
     /// return the locale-dependent decimal point
     static char get_decimal_point() noexcept
     {
-        const auto loc = localeconv();
+        const auto loc = cpt::localeconv();
         assert(loc != nullptr);
         return (loc->decimal_point == nullptr) ? '.' : *(loc->decimal_point);
     }
@@ -8247,7 +8247,7 @@ class serializer
     @param[in] ichar  indentation character to use
     */
     serializer(output_adapter_t<char> s, const char ichar)
-        : o(std::move(s)), loc(std::localeconv()),
+        : o(std::move(s)), loc(cpt::localeconv()),
           thousands_sep(loc->thousands_sep == nullptr ? '\0' : * (loc->thousands_sep)),
           decimal_point(loc->decimal_point == nullptr ? '\0' : * (loc->decimal_point)),
           indent_char(ichar), indent_string(512, indent_char)
diff --git a/common/strCompat.h b/common/strCompat.h
index a8066490..31ebce7c 100644
--- a/common/strCompat.h
+++ b/common/strCompat.h
@@ -3,6 +3,7 @@
 
 
 #include <string>
+#include <clocale>
 
 #ifdef NO_CPP11_STRING
 #include <sstream>
@@ -16,6 +17,18 @@
 
 namespace cpt
 {
+	static struct lconv* localeconv()
+	{
+	#ifdef NO_CPP11_STRING
+		static struct lconv result;
+		result.decimal_point = nullptr;
+		result.thousands_sep = nullptr;
+		return &result;
+	#else
+		return std::localeconv();
+	#endif
+	}
+
 	template<typename T>
 	static std::string to_string(const T& t)
 	{