3 files changed, 11 insertions, 6 deletions
diff --git a/lib/csv/dataType.ml b/lib/csv/dataType.ml
index 1d2c7f9..6bf85ae 100644
--- a/lib/csv/dataType.ml
+++ b/lib/csv/dataType.ml
@@ -1,4 +1,4 @@
-external show_float : float -> string = "show_float"
+external show_float : string -> float -> string = "show_float"
 
 let match_date = Re.Str.regexp {|[0-9]+/[0-9]+/[0-9]+|}
 
@@ -9,11 +9,11 @@ type t =
   | Integer of int
   | Float of float
 
-let to_string = function
+let to_string locale = function
   | Null -> ""
   | Error s -> s
   | Integer i -> string_of_int i
-  | Float f -> show_float f
+  | Float f -> show_float locale f
   | Content c -> (
       match String.starts_with ~prefix:"0" c with
       | false -> c
diff --git a/lib/csv/dataType.mli b/lib/csv/dataType.mli
index ebb8bc7..df5edf1 100644
--- a/lib/csv/dataType.mli
+++ b/lib/csv/dataType.mli
@@ -5,4 +5,5 @@ type t =
   | Integer of int
   | Float of float
 
-val to_string : t -> string
+val to_string : string -> t -> string
+(** [to_string locale value] Format the text using the given locale *)
diff --git a/lib/csv/format.c b/lib/csv/format.c
index 31e4bbe..1394dc7 100644
--- a/lib/csv/format.c
+++ b/lib/csv/format.c
@@ -36,13 +36,17 @@ int asprintf(char *strp[], const char *fmt, ...) {
     return r;}
 #endif // asprintf
 
-CAMLprim value show_float( value float_param )
+CAMLprim value show_float(value locale_param, value float_param )
 {
-    CAMLparam1( float_param );
+    CAMLparam2(locale_param, float_param );
     CAMLlocal1( ml_data );
     double f = Double_val(float_param);
     char* raw_data;
+    const char *s;
+    s = String_val(locale_param);
+    const char *saved_locale = setlocale(LC_NUMERIC, s);
     int data_len = asprintf(&raw_data, "%f", f);
+    setlocale(LC_NUMERIC, saved_locale);
     ml_data = caml_copy_string( raw_data );
     free(raw_data);
     CAMLreturn( ml_data );