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added read/write error handling to ed

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

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

@@ -127,6 +127,7 @@

 	char *p1, *p2;

 	Binit(&bcons, 0, OREAD);

+	Blethal(&bcons, nil);

 	notify(notifyf);

 	ARGBEGIN {

 	case 'o':

@@ -322,6 +323,7 @@

 				free(d);

 			}

 			Binit(&iobuf, io, OREAD);

+			Blethal(&iobuf, nil);

 			setwide();

 			squeeze(0);

 			c = zero != dol;

@@ -370,6 +372,7 @@

 				if((io = create(file, OWRITE, 0666)) < 0)

 					error(file);

 			Binit(&iobuf, io, OWRITE);

+			Blethal(&iobuf, nil);

 			wrapp = 0;

 			if(dol > zero)

 				putfile();

@@ -669,6 +672,7 @@

 		io = create("ed.hup", OWRITE, 0666);

 		if(io > 0){

 			Binit(&iobuf, io, OWRITE);

+			Blethal(&iobuf, nil);

 			putfile();

 		}

 	}

-- 

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