cat,nl: fix handling of open errors

$ cat -n does_not_exist; echo $?
cat: does_not_exist: No such file or directory
1

function                                             old     new   delta
print_numbered_lines                                 118     129     +11
nl_main                                              196     201      +5
cat_main                                             421     425      +4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 20/0)               Total: 20 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/coreutils/nl.c b/coreutils/nl.c
index c2f8b1042..2fdc9d85e 100644
--- a/coreutils/nl.c
+++ b/coreutils/nl.c
@@ -58,6 +58,8 @@ int nl_main(int argc UNUSED_PARAM, char **argv)
                 "number-width\0"        Required_argument "w"
         ;
 #endif
+        int exitcode;
+
         ns.width = 6;
         ns.start = 1;
         ns.inc = 1;
@@ -72,9 +74,10 @@ int nl_main(int argc UNUSED_PARAM, char **argv)
         if (!*argv)
                 *--argv = (char*)"-";
 
+        exitcode = EXIT_SUCCESS;
         do {
-                print_numbered_lines(&ns, *argv);
+                exitcode |= print_numbered_lines(&ns, *argv);
         } while (*++argv);
 
-        fflush_stdout_and_exit(EXIT_SUCCESS);
+        fflush_stdout_and_exit(exitcode);
 }