+/*
+ * If we have v?snprintf() and the C99 variadic macros, we can just
+ * use just the v?snprintf(). It is nice to try to trap the buffer
+ * overflow, however, so if we are DEBUGGING, and we cannot use the
+ * gcc brace groups, then use the function wrappers which try to trap
+ * the overflow. If we can use the gcc brace groups, we can try that
+ * even with the version that uses the C99 variadic macros.
+ */
+
+/* Note that we do not check against snprintf()/vsnprintf() returning
+ * negative values because that is non-standard behaviour and we use
+ * snprintf/vsnprintf only iff HAS_VSNPRINTF has been defined, and
+ * that should be true only if the snprintf()/vsnprintf() are true
+ * to the standard. */
+
+#if defined(HAS_SNPRINTF) && defined(HAS_C99_VARIADIC_MACROS) && !(defined(DEBUGGING) && !defined(PERL_USE_GCC_BRACE_GROUPS)) && !defined(PERL_GCC_PEDANTIC)
+# ifdef PERL_USE_GCC_BRACE_GROUPS
+# define my_snprintf(buffer, len, ...) ({ int __len__ = snprintf(buffer, len, __VA_ARGS__); if ((len) > 0 && (Size_t)__len__ >= (len)) Perl_croak(aTHX_ "panic: snprintf buffer overflow"); __len__; })
+# define PERL_MY_SNPRINTF_GUARDED
+# else
+# define my_snprintf(buffer, len, ...) snprintf(buffer, len, __VA_ARGS__)
+# endif
+#else
+# define my_snprintf Perl_my_snprintf
+# define PERL_MY_SNPRINTF_GUARDED
+#endif
+
+#if defined(HAS_VSNPRINTF) && defined(HAS_C99_VARIADIC_MACROS) && !(defined(DEBUGGING) && !defined(PERL_USE_GCC_BRACE_GROUPS)) && !defined(PERL_GCC_PEDANTIC)
+# ifdef PERL_USE_GCC_BRACE_GROUPS
+# define my_vsnprintf(buffer, len, ...) ({ int __len__ = vsnprintf(buffer, len, __VA_ARGS__); if ((len) > 0 && (Size_t)__len__ >= (len)) Perl_croak(aTHX_ "panic: vsnprintf buffer overflow"); __len__; })
+# define PERL_MY_VSNPRINTF_GUARDED
+# else
+# define my_vsnprintf(buffer, len, ...) vsnprintf(buffer, len, __VA_ARGS__)
+# endif
+#else
+# define my_vsnprintf Perl_my_vsnprintf
+# define PERL_MY_VSNPRINTF_GUARDED
+#endif
+
+#ifdef HAS_STRLCAT
+# define my_strlcat strlcat
+#else
+# define my_strlcat Perl_my_strlcat
+#endif
+
+#ifdef HAS_STRLCPY
+# define my_strlcpy strlcpy
+#else
+# define my_strlcpy Perl_my_strlcpy
+#endif
+