diff --git a/src/core/ngx_string.h b/src/core/ngx_string.h
new file mode 100644
index 0000000..0a78a06
--- /dev/null
+++ b/src/core/ngx_string.h
@@ -0,0 +1,26 @@
+#ifndef _NGX_STRING_H_INCLUDED_
+#define _NGX_STRING_H_INCLUDED_
+
+
+#include <ngx_config.h>
+
+
+#if (WIN32)
+
+#define ngx_snprintf              _snprintf
+#define ngx_vsnprintf             _vsnprintf
+
+#else
+
+#define ngx_snprintf              snprintf
+#define ngx_vsnprintf             vsnprintf
+
+#endif
+
+#define ngx_memcpy(dst, src, n)   memcpy(dst, src, n)
+#define ngx_cpymem(dst, src, n)   memcpy(dst, src, n) + n
+
+char *ngx_cpystrn(char *dst, char *src, size_t n);
+
+
+#endif /* _NGX_STRING_H_INCLUDED_ */