+# if (defined(_MSC_VER) && defined(DLL_EXPORT))
+ __declspec(dllexport) int snprintf(char *, size_t, const char *, /*args*/ ...);
+ __declspec(dllexport) int vsnprintf(char *, size_t, const char *, va_list);
+# elif (defined(_MSC_VER) && !defined(DLL_EXPORT) && !defined(DLL_STATIC) )
+ __declspec(dllimport) int snprintf(char *, size_t, const char *, /*args*/ ...);
+ __declspec(dllimport) int vsnprintf(char *, size_t, const char *, va_list);
+# else
+ extern int snprintf(char *, size_t, const char *, /*args*/ ...);
+ extern int vsnprintf(char *, size_t, const char *, va_list);
+# endif
+
+#endif
+
+/* use internal functions when OS provided ones are borken */
+#if defined(HAVE_SNPRINTF) && defined(PREFER_PORTABLE_SNPRINTF)
+extern int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...);
+extern int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
+#define snprintf portable_snprintf
+#define vsnprintf portable_vsnprintf
+#endif
+
+/* prototype of GNU functions */
+#ifndef __BORLANDC__
+extern int asprintf (char **ptr, const char *fmt, /*args*/ ...);
+extern int vasprintf (char **ptr, const char *fmt, va_list ap);