ash: printf builtin with no arguments should not exit

diff --git a/coreutils/printf.c b/coreutils/printf.c
index 76524f70648e6d1d66ffa47c81d5f97facb8e4a9..b0a48cda4a1738b0baf95456a4e566efd245e579 100644 (file)
--- a/coreutils/printf.c
+++ b/coreutils/printf.c
@@ -359,8 +359,15 @@ int printf_main(int argc UNUSED_PARAM, char **argv)
         * We will mimic coreutils. */
        if (argv[1] && argv[1][0] == '-' && argv[1][1] == '-' && !argv[1][2])
                argv++;
-       if (!argv[1])
+       if (!argv[1]) {
+               if (ENABLE_ASH_BUILTIN_PRINTF
+                && applet_name[0] != 'p'
+               ) {
+                       bb_error_msg("usage: printf FORMAT [ARGUMENT...]");
+                       return 2; /* bash compat */
+               }
                bb_show_usage();
+       }
 
        format = argv[1];
        argv2 = argv + 2;