add a compatible sync command

WEGA/src/cmd/Makefile

@@ -1,5 +1,9 @@
+CAS=		cas
+CC=		cc
+LD=		ld
+
 FILES=		getud putud
-STRIPFILES=	copydisk dump dumpdir format restor tar verify
+STRIPFILES=	copydisk dump dumpdir format restor sync tar verify
 
 all: $(FILES) $(STRIPFILES) strip
 
@@ -8,3 +12,9 @@ strip:
 
 clean:
 	rm -f $(FILES) $(STRIPFILES)
+
+compat1crt.o:	compat1crt.s
+	$(CAS) -u -o $@ $*.s
+
+sync:	compat1crt.o sync.o
+	$(LD) -o $@ -e start compat1crt.o sync.o -lc

WEGA/src/cmd/compat1crt.s

@@ -0,0 +1,28 @@
+.comm	2,	_environ;
+
+.code
+start::
+	{
+	jr foo
+.byte	"......1981 87wega3.2."
+.byte	%00
+foo:
+		ld	r7,@r15
+		lda	r6,%0000+2(r15)
+		ld	r2,@r6
+		clr	%0000-2(r2)
+		ld	r5,r6
+		subl	rr0,rr0
+		cpir	r0,@r5,r1,eq
+		cp	r5,r2
+		jr	ult,_foo
+		dec	r5,#2
+_foo:
+		ld	_environ,r5
+		call	_main
+		ld	r7,r2
+		call	__callex
+		sc	#1
+	}
+.data
+. = .+2

WEGA/src/cmd/sync.c

@@ -0,0 +1,7 @@
+char whatstr[] = "@[$]sync.c	1.2  07/24/82 03:16:45 - 87wega3.2";
+
+main()
+{
+        sync();
+        exit(0);
+}