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-rw-r--r--src/util/compat_va_copy.h44
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diff --git a/src/util/compat_va_copy.h b/src/util/compat_va_copy.h
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+#ifndef _COMPAT_VA_COPY_H_INCLUDED_
+#define _COMPAT_VA_COPY_H_INCLUDED_
+
+/*++
+/* NAME
+/* compat_va_copy 3h
+/* SUMMARY
+/* compatibility
+/* SYNOPSIS
+/* #include <compat_va_copy.h>
+/* DESCRIPTION
+/* .nf
+
+ /*
+ * C99 defines va_start and va_copy as macros, so we can probe the
+ * compilation environment with #ifdef etc. Some environments define
+ * __va_copy so we probe for that, too.
+ */
+#if !defined(va_start)
+#error "include <stdarg.h> first"
+#endif
+
+#if !defined(VA_COPY)
+#if defined(va_copy)
+#define VA_COPY(dest, src) va_copy(dest, src)
+#elif defined(__va_copy)
+#define VA_COPY(dest, src) __va_copy(dest, src)
+#else
+#define VA_COPY(dest, src) (dest) = (src)
+#endif
+#endif /* VA_COPY */
+
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+#endif