ac3dec: Show usage if no parameter is passed

When ac3dec is called without any argument the application hangs forever.

Instead of hanging, print the usage and exit.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/ac3dec/ac3dec.c b/ac3dec/ac3dec.c
index 00c4f1ac3ed22e362723c1ab7c602e40cde4c5da..89d7ce822667296c76671334331afe8d99cacf6d 100644 (file)
--- a/ac3dec/ac3dec.c
+++ b/ac3dec/ac3dec.c
@@ -130,6 +130,11 @@ int main(int argc,char *argv[])
        out_config.spdif = SPDIF_NONE;
        out_config.hdmi = 0;
 
+       if (isatty(fileno(stdin)) && (argc == 1)) {
+               help();
+               return 1;
+       }
+
        morehelp = 0;
        while (1) {
                int c;