support 32 bit runes

Notes:
Mon Apr 29 20:43:28 EDT 2013 geoff
    being done independently.


Reference: /n/sources/patch/sorry/bloated-rune-ed
Date: Fri Jan 29 07:03:01 CET 2010
Signed-off-by: quanstro@quanstro.net
Reviewed-by: geoff

--- /sys/src/cmd/ed.c	Fri Jan 29 07:02:37 2010
+++ /sys/src/cmd/ed.c	Fri Jan 29 07:02:35 2010
@@ -54,7 +54,7 @@
 int	peekc;
 int	pflag;
 int	rescuing;
-Rune	rhsbuf[LBSIZE/2];
+Rune	rhsbuf[LBSIZE/sizeof(Rune)];
 char	savedfile[FNSIZE];
 jmp_buf	savej;
 int	subnewa;
@@ -1010,7 +1010,7 @@
 	tl = tline;
 	bp = getblock(tl, OWRITE);
 	nl = nleft;
-	tl &= ~((BLKSIZE/2)-1);
+	tl &= ~((BLKSIZE/sizeof(Rune))-1);
 	while(*bp = *lp++) {
 		if(*bp++ == '\n') {
 			bp[-1] = 0;
@@ -1019,7 +1019,7 @@
 		}
 		nl -= sizeof(Rune);
 		if(nl == 0) {
-			tl += BLKSIZE/2;
+			tl += BLKSIZE/sizeof(Rune);
 			bp = getblock(tl, OWRITE);
 			nl = nleft;
 		}
@@ -1046,8 +1046,8 @@
 	static uchar ibuff[BLKSIZE];
 	static uchar obuff[BLKSIZE];
 
-	bno = atl / (BLKSIZE/2);
-	off = (atl<<1) & (BLKSIZE-1) & ~03;
+	bno = atl / (BLKSIZE/sizeof(Rune));
+	off = (atl*sizeof(Rune)) & (BLKSIZE-1) & ~03;
 	if(bno >= NBLK) {
 		lastc = '\n';
 		error(T);
@@ -1238,7 +1238,7 @@
 		if(c == '\\') {
 			c = getchr();
 			*p++ = ESCFLG;
-			if(p >= &rhsbuf[LBSIZE/2])
+			if(p >= &rhsbuf[LBSIZE/sizeof(Rune)])
 				error(Q);
 		} else
 		if(c == '\n' && (!globp || !globp[0])) {
@@ -1249,7 +1249,7 @@
 		if(c == seof)
 			break;
 		*p++ = c;
-		if(p >= &rhsbuf[LBSIZE/2])
+		if(p >= &rhsbuf[LBSIZE/sizeof(Rune)])
 			error(Q);
 	}
 	*p = 0;