diff -urN lrzsz-0.12.20/src/zm.c lrzsz-0.12.20.new/src/zm.c

--- lrzsz-0.12.20/src/zm.c	Tue Dec 29 09:48:38 1998

+++ lrzsz-0.12.20.new/src/zm.c	Tue Oct  8 12:46:58 2002

@@ -431,10 +431,12 @@

 	VPRINTF(3,("zsdata: %lu %s", (unsigned long) length, 

 		Zendnames[(frameend-ZCRCE)&3]));

 	crc = 0;

-	do {

-		zsendline(*buf); crc = updcrc((0377 & *buf), crc);

-		buf++;

-	} while (--length>0);

+

+	for( ; length; length--) {

+	  zsendline(*buf); crc = updcrc((0377 & *buf), crc);

+	  buf++;

+	}

+

 	xsendline(ZDLE); xsendline(frameend);

 	crc = updcrc(frameend, crc);