[alsa-devel] [PATCH v4 2/2] 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 --- Changes since v3: - Fix return value Changes since v2: - No changes Changes since v1: - Also check for isatty, so that 'ac3dec < file.wav' can still work ac3dec/ac3dec.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/ac3dec/ac3dec.c b/ac3dec/ac3dec.c index 00c4f1a..ce6c507 100644 --- 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;