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diff --git a/src/stlplus/strings/string_float.cpp b/src/stlplus/strings/string_float.cpp
new file mode 100644
index 0000000..0de056f
--- /dev/null
+++ b/src/stlplus/strings/string_float.cpp
@@ -0,0 +1,96 @@
+////////////////////////////////////////////////////////////////////////////////
+
+//   Author:    Andy Rushton
+//   Copyright: (c) Southampton University 1999-2004
+//              (c) Andy Rushton           2004-2009
+//   License:   BSD License, see ../docs/license.html
+
+////////////////////////////////////////////////////////////////////////////////
+#include "string_float.hpp"
+#include <stdlib.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+namespace stlplus
+{
+
+  // added as a local copy to break the dependency on the portability library
+  static std::string local_dformat(const char* format, ...) throw(std::invalid_argument)
+  {
+    std::string formatted;
+    va_list args;
+    va_start(args, format);
+#ifdef MSWINDOWS
+    int length = 0;
+    char* buffer = 0;
+    for(int buffer_length = 256; ; buffer_length*=2)
+    {
+      buffer = (char*)malloc(buffer_length);
+      if (!buffer) throw std::invalid_argument("string_float");
+      length = _vsnprintf(buffer, buffer_length-1, format, args);
+      if (length >= 0)
+      {
+        buffer[length] = 0;
+        formatted += std::string(buffer);
+        free(buffer);
+        break;
+      }
+      free(buffer);
+    }
+#else
+    char* buffer = 0;
+    int length = vasprintf(&buffer, format, args);
+    if (!buffer) throw std::invalid_argument("string_float");
+    if (length >= 0)
+      formatted += std::string(buffer);
+    free(buffer);
+#endif
+    va_end(args);
+    if (length < 0) throw std::invalid_argument("string_float");
+    return formatted;
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+  // floating-point types
+
+  std::string float_to_string(float f, real_display_t display, unsigned width, unsigned precision)
+    throw(std::invalid_argument)
+  {
+    return double_to_string((double)f, display, width, precision);
+  }
+
+  std::string double_to_string(double f, real_display_t display, unsigned width, unsigned precision)
+    throw(std::invalid_argument)
+  {
+    switch(display)
+    {
+    case display_fixed:
+      return local_dformat("%*.*f", width, precision, f);
+    case display_floating:
+      return local_dformat("%*.*e", width, precision, f);
+    case display_mixed:
+      return local_dformat("%*.*g", width, precision, f);
+    default:
+      throw std::invalid_argument("invalid radix display value");
+    }
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+  float string_to_float(const std::string& value)
+    throw(std::invalid_argument)
+  {
+    return (float)string_to_double(value);
+  }
+
+  double string_to_double(const std::string& value)
+    throw(std::invalid_argument)
+  {
+    // TODO - error checking
+    return strtod(value.c_str(), 0);
+  }
+
+  ////////////////////////////////////////////////////////////////////////////////
+
+} // end namespace stlplus