Implement C99's va_copy() macro.

share/man/man3/Makefile

@@ -71,7 +71,7 @@ MLINKS+=queue.3 TAILQ_PREV.3
 MLINKS+=queue.3 TAILQ_REMOVE.3
 
 MLINKS+=stdarg.3 varargs.3 stdarg.3 va_arg.3 stdarg.3 va_end.3
-MLINKS+=stdarg.3 va_start.3
+MLINKS+=stdarg.3 va_copy.3 stdarg.3 va_start.3
 
 MLINKS+=timeradd.3 timersub.3 timeradd.3 timerclear.3 timeradd.3 timerisset.3
 MLINKS+=timeradd.3 timercmp.3

share/man/man3/stdarg.3

@@ -36,7 +36,7 @@
 .\"	@(#)stdarg.3	8.1 (Berkeley) 6/5/93
 .\" $FreeBSD$
 .\"
-.Dd June 5, 1993
+.Dd September 18, 2002
 .Dt STDARG 3
 .Os
 .Sh NAME
@@ -49,6 +49,8 @@
 .Ft type
 .Fn va_arg "va_list ap" type
 .Ft void
+.Fn va_copy "va_list dest" "va_list src"
+.Ft void
 .Fn va_end "va_list ap"
 .Sh DESCRIPTION
 A function may be called with a varying number of arguments of varying
@@ -132,6 +134,27 @@ Successive invocations return the values of the remaining
 arguments.
 .Pp
 The
+.Fn va_copy
+macro copies a variable argument list, previously initialized by
+.Fn va_start ,
+from
+.Va src
+to
+.Va dest .
+The state is preserved such that it is equivalent to calling
+.Fn va_start
+with the same second argument used with
+.Va src ,
+and calling
+.Fn va_arg
+the same number of times as called with
+.Va src .
+.Pp
+The
+.Fn va_copy
+macro returns no value.
+.Pp
+The
 .Fn va_end
 macro handles a normal return from the function whose variable argument
 list was initialized by

sys/alpha/include/stdarg.h

@@ -51,6 +51,9 @@ typedef __va_list	va_list;
 #define	va_arg(ap, type) \
 	__builtin_va_arg((ap), type)
 
+#define	va_copy(dest, src) \
+	__builtin_va_copy((dest), (src))
+
 #define	va_end(ap) \
 	__builtin_va_end(ap)
 

sys/amd64/include/stdarg.h

@@ -41,6 +41,9 @@ typedef	__va_list	va_list;
 #define	va_arg(ap, type) \
 	__builtin_va_arg((ap), type)
 
+#define	va_copy(dest, src) \
+	__builtin_va_copy((dest), (src))
+
 #define	va_end(ap) \
 	__builtin_va_end(ap)
 

sys/i386/include/stdarg.h

@@ -50,6 +50,9 @@ typedef __va_list	va_list;
 #define	va_arg(ap, type) \
 	__builtin_va_arg((ap), type)
 
+#define	va_copy(dest, src) \
+	__builtin_va_copy((dest), (src))
+
 #define	va_end(ap) \
 	__builtin_va_end(ap)
 

sys/ia64/include/stdarg.h

@@ -50,6 +50,9 @@ typedef	__va_list	va_list;
 #define	va_arg(ap, type) \
 	__builtin_va_arg((ap), type)
 
+#define	va_copy(dest, src) \
+	__builtin_va_copy((dest), (src))
+
 #define	va_end(ap) \
 	__builtin_va_end(ap)
 

sys/powerpc/include/stdarg.h

@@ -43,6 +43,9 @@ typedef	__va_list	va_list;
 #define	va_arg(ap, type) \
 	__builtin_va_arg((ap), type)
 
+#define	va_copy(dest, src) \
+	__builtin_va_copy((dest), (src))
+
 #define	va_end(ap) \
 	__builtin_va_end(ap)
 

sys/sparc64/include/stdarg.h

@@ -53,6 +53,9 @@ typedef	__va_list	va_list;
 #define	va_arg(ap, type) \
 	__builtin_va_arg((ap), type)
 
+#define	va_copy(dest, src) \
+	__builtin_va_copy((dest), (src))
+
 #define	va_end(ap) \
 	__builtin_va_end(ap)