From 78a3c717811e2ec9681465ebc22b55f7e969b7fb Mon Sep 17 00:00:00 2001
From: Keith Bostic <bostic@ucbvax.Berkeley.EDU>
Date: Tue, 9 Feb 1988 05:16:02 -0800
Subject: [PATCH] check read/writes for failure

SCCS-vsn: local/local.cmd/20b.c 5.2
---
 usr/src/local/local.cmd/20b.c | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/usr/src/local/local.cmd/20b.c b/usr/src/local/local.cmd/20b.c
index 13d3fd5c32..04adcc2fc8 100644
--- a/usr/src/local/local.cmd/20b.c
+++ b/usr/src/local/local.cmd/20b.c
@@ -1,35 +1,43 @@
 /*
  * Copyright (c) 1986 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of California at Berkeley. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
  */
 
 #ifndef lint
 char copyright[] =
 "@(#) Copyright (c) 1986 Regents of the University of California.\n\
  All rights reserved.\n";
-#endif not lint
+#endif /* not lint */
 
 #ifndef lint
-static char sccsid[] = "@(#)20b.c	5.1 (Berkeley) %G%";
-#endif not lint
+static char sccsid[] = "@(#)20b.c	5.2 (Berkeley) %G%";
+#endif /* not lint */
 
+#define BSIZE	(20 * 512)
 main()
 {
 	register char *base, *current;
 	register int cc, want;
-	int bsize = 20 * 512;
 	char *alloca();
 
-	base = alloca(bsize);
-	for(cc = bsize; cc > 0;) {
+	base = alloca(BSIZE);
+	for (cc = BSIZE; cc > 0;) {
 		current = base;
-		for(want = bsize; want > 0 && cc > 0; want -= cc) {
-			cc = read(0,current,want);
+		for (want = BSIZE; want > 0 && cc > 0; want -= cc) {
+			if ((cc = read(0, current, want)) < 0)
+				return(-1);
 			current += cc;
 		}
-		if((want = bsize - want) > 0)
-		    write(1,base,want);
+		want = BSIZE - want;
+		if (want && write(1, base, want) != want)
+			return(-1);
 	}
 	return(0);
 }
-- 
2.20.1