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mothra: remove 4K snarf limit for edit panel

--- a/sys/src/cmd/mothra/libpanel/edit.c

+++ b/sys/src/cmd/mothra/libpanel/edit.c

@@ -49,8 +49,8 @@

 		sb->setscrollbar(sb, ep->t->top, ep->t->bot, ep->t->etext-ep->t->text);

 }

 void pl_snarfedit(Panel *p, int cut){

-	int fd, n, s0, s1;

-	char *s;

+	int fd, n, r, s0, s1;

+	char *s, *x;

 	Rune *t;

 	if((fd=open("/dev/snarf", cut ? OWRITE|OTRUNC : OREAD))<0)

@@ -68,12 +68,19 @@

 		free(s);

 		plepaste(p, 0, 0);

 	}else{

-		if((s=malloc(4096))==0){

-			close(fd);

-			return;

+		n=0;

+		s=nil;

+		for(;;){

+			if((x=realloc(s, n+1024)) == nil){

+				free(s);

+				close(fd);

+				return;

+			}

+			s=x;

+			if((r = read(fd, s+n, 1024)) <= 0)

+				break;

+			n += r;

 		}

-		if((n=readn(fd, s, 4096))<0)

-			n=0;

 		t=runesmprint("%.*s", n, s);

 		plepaste(p, t, runestrlen(t));

 		free(s);

-- 

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