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fcp: use iounit() to determine buffer size, reduce number of worker procs to 8

--- a/sys/src/cmd/fcp.c

+++ b/sys/src/cmd/fcp.c

@@ -1,8 +1,9 @@

 #include <u.h>

 #include <libc.h>

 #define	DEFB	(8*1024)

-#define	Nwork	16

+#define	Nwork	8

+int	buflen;

 int	failed;

 int	gflag;

 int	uflag;

@@ -130,6 +131,11 @@

 		failed = 1;

 		return;

 	}

+

+	buflen = iounit(fdf);

+	if(buflen <= 0)

+		buflen = DEFB;

+

 	if(copy1(fdf, fdt, from, to)==0 && (xflag || gflag || uflag)){

 		nulldir(&dirt);

 		if(xflag){

@@ -191,11 +197,16 @@

 void

 worker(int fdf, int fdt, char *from, char *to)

 {

-	char buf[DEFB], *bp;

+	char *buf, *bp;

 	long len, n;

 	vlong o;

-	len = sizeof(buf);

+	len = buflen;

+	buf = malloc(len);

+	if(buf == nil){

+		fprint(2, "out of memory\n");

+		_exits(nil);

+	}

 	bp = buf;

 	o = nextoff();

@@ -212,11 +223,13 @@

 		o += n;

 		len -= n;

 		if(len == 0){

-			len = sizeof buf;

+			len = buflen;

 			bp = buf;

 			o = nextoff();

 		}

 	}

+

+	free(buf);

 	_exits(nil);

 }

@@ -227,7 +240,7 @@

 	qlock(&lk);

 	o = off;

-	off += DEFB;

+	off += buflen;

 	qunlock(&lk);

 	return o;