sum, md5sum, sha1sum: set exit status properly on open/read errors

1 files changed, 7 insertions, 3 deletions

diff --git a/sys/src/cmd/sha1sum.c b/sys/src/cmd/sha1sum.c
index c023ae8e0..4ce7f0d19 100644
--- a/sys/src/cmd/sha1sum.c
+++ b/sys/src/cmd/sha1sum.c
@@ -7,6 +7,8 @@
 
 #pragma	varargck	type	"M"	uchar*
 
+static char exitstr[ERRMAX];
+
 typedef struct Sha2 Sha2;
 struct Sha2 {
 	int	bits;
@@ -48,7 +50,8 @@ sum(int fd, char *name)
 	while((n = read(fd, buf, sizeof buf)) > 0)
 		(*shafunc)(buf, n, nil, s);
 	if(n < 0){
-		fprint(2, "reading %s: %r\n", name? name: "stdin");
+		snprint(exitstr, sizeof(exitstr), "reading %s: %r\n", name? name: "stdin");
+		fprint(2, "%s", exitstr);
 		return;
 	}
 	(*shafunc)(nil, 0, digest, s);
@@ -96,11 +99,12 @@ main(int argc, char *argv[])
 		for(i = 0; i < argc; i++){
 			fd = open(argv[i], OREAD);
 			if(fd < 0){
-				fprint(2, "%s: can't open %s: %r\n", argv0, argv[i]);
+				snprint(exitstr, sizeof(exitstr), "can't open %s: %r", argv[i]);
+				fprint(2, "%s: %s\n", argv0, exitstr);
 				continue;
 			}
 			sum(fd, argv[i]);
 			close(fd);
 		}
-	exits(nil);
+	exits(exitstr);
 }