Check for working vsnprintf.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@2572 ec53bebd-3082-4978-b11e-865c3cabbd6b

configure.in

@@ -113,11 +113,43 @@ if test "$ac_cv_func_snprintf_working" = yes; then
 	AC_DEFINE_UNQUOTED($foo)
 fi
 
+AC_CACHE_CHECK(for working vsnprintf,ac_cv_func_vsnprintf_working,
+ac_cv_func_vsnprintf_working=yes
+AC_TRY_RUN([
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
+int foo(int num, ...)
+{
+changequote(`,')dnl
+	char bar[3];
+changequote([,])dnl
+	va_list arg;
+	va_start(arg, num);
+	vsnprintf(bar, 2, arg);
+	va_end(arg);
+	return strcmp(bar, "1");
+}
+
+
+int main()
+{
+	return foo(0, "12");
+}],:,ac_cv_func_vsnprintf_working=no,:))
+: << END
+@@@funcs="$funcs vsnprintf"@@@
+END
+if test "$ac_cv_func_vsnprintf_working" = yes; then
+	foo=HAVE_VSNPRINTF
+	AC_DEFINE_UNQUOTED($foo)
+fi
+
 AC_CHECK_FUNCS(_getpty asnprintf asprintf gethostname getmsg)
 AC_CHECK_FUNCS(grantpt logwtmp mktime ptsname rand random revoke)
 AC_CHECK_FUNCS(select setitimer setlogin setpcred setpgid setsid)
 AC_CHECK_FUNCS(setsid setsockopt strstr timegm ttyname unlockpt)
-AC_CHECK_FUNCS(vasnprintf vasprintf vhangup vsnprintf)
+AC_CHECK_FUNCS(vasnprintf vasprintf vhangup)
 
 AC_TYPE_SIGNAL
 if test "$ac_cv_type_signal" = "void" ; then