[PATCH v5 03/13] spi: spidev_test: make size argument mandatory for --size

[Jonas Rebmann]

When the argument to --size is omitted, zero or not a number,
abort with a message instead of transmitting default_tx[].

Signed-off-by: Jonas Rebmann <jre@xxxxxxxxxxxxxx>
---
 tools/spi/spidev_test.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/spi/spidev_test.c b/tools/spi/spidev_test.c
index 3721ed15352f..b2940a25b7a8 100644
--- a/tools/spi/spidev_test.c
+++ b/tools/spi/spidev_test.c
@@ -44,6 +44,7 @@ static int verbose;
 static int transfer_size;
 static int iterations;
 static int interval = 5; /* interval in seconds for showing transfer rate */
+static int random_input;
 static int input_choices;
 
 static uint8_t default_tx[] = {
@@ -319,6 +320,7 @@ static void parse_opts(int argc, char *argv[])
 			break;
 		case 'S':
 			transfer_size = atoi(optarg);
+			random_input = 1;
 			input_choices++;
 			break;
 		case 'I':
@@ -453,6 +455,9 @@ int main(int argc, char *argv[])
 	if (input_choices > 1)
 		pabort("only one of -S (--size), -p, -i (--input) may be selected");
 
+	if (random_input && !transfer_size)
+		pabort("a nonzero size argument is mandatory for -S (--size)");
+
 	fd = open(device, O_RDWR);
 	if (fd < 0)
 		pabort("can't open device");

-- 
2.56.0.rc0.108.gf0ef1b96a0