[alsa-devel] [PATCH v4 2/2] ac3dec: Show usage if no parameter is passed

[Fabio Estevam]

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 at 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;
-- 
1.7.9.5