1 files changed, 47 insertions, 0 deletions
diff --git a/databases/nanodbc/files/patch-nanodbc_nanodbc.cpp b/databases/nanodbc/files/patch-nanodbc_nanodbc.cpp
new file mode 100644
index 000000000000..f0489859293b
--- /dev/null
+++ b/databases/nanodbc/files/patch-nanodbc_nanodbc.cpp
@@ -0,0 +1,47 @@
+- Fix compilation with unsigned char SQLCHAR type
+
+--- nanodbc/nanodbc.cpp.orig	2023-01-13 22:42:27 UTC
++++ nanodbc/nanodbc.cpp
+@@ -257,10 +257,20 @@ constexpr std::size_t size(const T (&array)[N]) noexc
+ }
+ #endif
+ 
++// Helper function to compute string length for SQLCHAR types
++template <typename T>
++inline std::size_t sqlchar_length(const T* str) noexcept
++{
++    const T* s = str;
++    while (*s) ++s;
++    return s - str;
++}
++
+ template <std::size_t N>
+ inline std::size_t size(NANODBC_SQLCHAR const (&array)[N]) noexcept
+ {
+-    auto const n = std::char_traits<NANODBC_SQLCHAR>::length(array);
++    // Use custom length function instead of char_traits which doesn't support unsigned char
++    auto const n = sqlchar_length(array);
+     NANODBC_ASSERT(n < N);
+     return n < N ? n : N - 1;
+ }
+@@ -3563,9 +3573,9 @@ std::list<datasource> list_datasources()
+                 "incompatible SQLCHAR and string::value_type");
+ 
+             datasource dsn;
+-            dsn.name = string(&name[0], &name[std::char_traits<NANODBC_SQLCHAR>::length(name)]);
++            dsn.name = string(&name[0], &name[sqlchar_length(name)]);
+             dsn.driver =
+-                string(&driver[0], &driver[std::char_traits<NANODBC_SQLCHAR>::length(driver)]);
++                string(&driver[0], &driver[sqlchar_length(driver)]);
+ 
+             dsns.push_back(std::move(dsn));
+             direction = SQL_FETCH_NEXT;
+@@ -3616,7 +3626,7 @@ std::list<driver> list_drivers()
+                 "incompatible SQLCHAR and string::value_type");
+ 
+             driver drv;
+-            drv.name = string(&descr[0], &descr[std::char_traits<NANODBC_SQLCHAR>::length(descr)]);
++            drv.name = string(&descr[0], &descr[sqlchar_length(descr)]);
+ 
+             drvs.push_back(std::move(drv));
+             direction = SQL_FETCH_NEXT;