From c1fb3c0005971590e8cf7a195274a8945a71345d Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Tue, 12 Mar 2024 10:22:58 +0100
Subject: [PATCH] Add ways to substitute strtof/strtod/strtold with custom
 functions

The standard strtof/strtod/strtold are by default locale-aware. There
are a number of situations where we'd rather want to be able to use
locale-independent parsing functions. This can be done by setting the
ARGPARSE_CUSTOM_STRTOF/ARGPARSE_CUSTOM_STRTOD/ARGPARSE_CUSTOM_STRTOLD
macros to the appropriate value.
---
 include/argparse/argparse.hpp | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/include/argparse/argparse.hpp b/include/argparse/argparse.hpp
index c41cdb1..c93c876 100644
--- a/include/argparse/argparse.hpp
+++ b/include/argparse/argparse.hpp
@@ -58,6 +58,18 @@ SOFTWARE.
 #include <vector>
 #endif
 
+#ifndef ARGPARSE_CUSTOM_STRTOF
+#define ARGPARSE_CUSTOM_STRTOF strtof
+#endif
+
+#ifndef ARGPARSE_CUSTOM_STRTOD
+#define ARGPARSE_CUSTOM_STRTOD strtod
+#endif
+
+#ifndef ARGPARSE_CUSTOM_STRTOLD
+#define ARGPARSE_CUSTOM_STRTOLD strtold
+#endif
+
 namespace argparse {
 
 namespace details { // namespace for helper methods
@@ -347,9 +359,10 @@ template <class T> struct parse_number<T> {
 namespace {
 
 template <class T> inline const auto generic_strtod = nullptr;
-template <> inline const auto generic_strtod<float> = strtof;
-template <> inline const auto generic_strtod<double> = strtod;
-template <> inline const auto generic_strtod<long double> = strtold;
+template <> inline const auto generic_strtod<float> = ARGPARSE_CUSTOM_STRTOF;
+template <> inline const auto generic_strtod<double> = ARGPARSE_CUSTOM_STRTOD;
+template <>
+inline const auto generic_strtod<long double> = ARGPARSE_CUSTOM_STRTOLD;
 
 } // namespace