+#if defined(HAVE_VSNPRINTF)
+ if (vsnprintf(atmp, MAX_STRING_LENGTH, ainto, ap) >= MAX_STRING_LENGTH)
+ {
+ fprintf(stderr, "Internal error: mvsprintf output truncated.\n");
+ }
+#else
+ {
+ int wlen;
+
+ wlen = vsprintf(atmp, ainto, ap);
+
+ if (wlen < 0 || wlen >= MAX_STRING_LENGTH)
+ {
+ wassertl(0, "mvsprintf overflowed.");
+ }
+ }
+#endif
+