update fmt to use some initialization

tweak ar so the pkgdef file doesn't cause it not to generate a symbol table

SVN=128119

src/cmd/ar/ar.c

@@ -111,6 +111,7 @@ char	artemp[] =	"/tmp/vXXXXX";
 char	movtemp[] =	"/tmp/v1XXXXX";
 char	tailtemp[] =	"/tmp/v2XXXXX";
 char	symdef[] =	"__.SYMDEF";
+char	pkgdef[] =	"__.PKGDEF";
 
 int	aflag;				/* command line flags */
 int	bflag;
@@ -566,7 +567,8 @@ scanobj(Biobuf *b, Arfile *ap, long size)
 	offset = Boffset(b);
 	obj = objtype(b, 0);
 	if (obj < 0) {			/* not an object file */
-		allobj = 0;
+		if (strcmp(file, pkgdef) != 0)  /* don't clear allobj if it's pkg defs */
+			allobj = 0;
 		d = dirfstat(Bfildes(b));
 		if (d != nil && d->length == 0)
 			fprint(2, "ar: zero length file %s\n", file);

src/lib/fmt.go

@@ -18,11 +18,19 @@ export Fmt, New;
 const NByte = 64;
 const NPows10 = 160;  // BUG: why not nelem(pows10);
 
-var ldigits string;
-var udigits string;
-var inited bool;
+var ldigits string = "0123456789abcdef";  // BUG: Should be const
+var udigits string = "0123456789ABCDEF";  // BUG: Should be const
 var pows10 [NPows10] double;
 
+func init() {
+	pows10[0] = 1.0e0;
+	pows10[1] = 1.0e1;
+	for i:=2; i<NPows10; i++ {
+		m := i/2;
+		pows10[i] = pows10[m] * pows10[i-m];
+	}
+}
+
 type Fmt struct {
 	buf string;
 	wid int;
@@ -43,18 +51,6 @@ func (f *Fmt) clearbuf() {
 func (f *Fmt) init() {
 	f.clearbuf();
 	f.clearflags();
-	if inited {
-		return;
-	}
-	ldigits = "0123456789abcdef";  // BUG: should be initialized const
-	udigits = "0123456789ABCDEF";  // BUG: should be initialized const
-	// BUG: should be done with initialization
-	var p double = 1.0;
-	for i := 0; i < NPows10; i++ {
-		pows10[i] = p;
-		p *= 10.0;
-	}
-	inited = true;
 }
 
 func New() *Fmt {