[dpdk-dev] [PATCH v4 7/7] examples/vhost_crypto: enhance getopt_long usage

[Ibtisam Tariq <ibtisam.tariq@emumba.com>]

Instead of using getopt_long return value, strcmp was used to
compare the input parameters with the struct option array. This
patch get rid of all those strcmp by directly binding each longopt
with an int enum. This is to improve readability and consistency in
all examples.

Bugzilla ID: 238
Cc: roy.fan.zhang@intel.com

Reported-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Ibtisam Tariq <ibtisam.tariq@emumba.com>
---
v4:
* Set indentation of preprocessor directives.

v3:
* None.

v2:
* Remove extra indentations.
* Remove extra block brackets in switch statement.
* Change enum names to start with OPT_ and remove KEYWORD from enum names.
* Remove unused short options.

v1:
* enhance getopt_long usage.
---
 examples/vhost_crypto/main.c | 86 +++++++++++++++++++++---------------
 1 file changed, 50 insertions(+), 36 deletions(-)

diff --git a/examples/vhost_crypto/main.c b/examples/vhost_crypto/main.c
index 29c8f7228..efae99781 100644
--- a/examples/vhost_crypto/main.c
+++ b/examples/vhost_crypto/main.c
@@ -62,10 +62,16 @@ struct vhost_crypto_options {
 	uint32_t guest_polling;
 } options;
 
-#define CONFIG_KEYWORD		"config"
-#define SOCKET_FILE_KEYWORD	"socket-file"
-#define ZERO_COPY_KEYWORD	"zero-copy"
-#define POLLING_KEYWORD		"guest-polling"
+enum {
+#define OPT_CONFIG          "config"
+	OPT_CONFIG_NUM = 256,
+#define OPT_SOCKET_FILE     "socket-file"
+	OPT_SOCKET_FILE_NUM,
+#define OPT_ZERO_COPY       "zero-copy"
+	OPT_ZERO_COPY_NUM,
+#define OPT_POLLING         "guest-polling"
+	OPT_POLLING_NUM,
+};
 
 #define NB_SOCKET_FIELDS	(2)
 
@@ -198,8 +204,8 @@ vhost_crypto_usage(const char *prgname)
 		"  --%s (lcore,cdev_id,queue_id)[,(lcore,cdev_id,queue_id)]\n"
 		"  --%s: zero copy\n"
 		"  --%s: guest polling\n",
-		prgname, SOCKET_FILE_KEYWORD, CONFIG_KEYWORD,
-		ZERO_COPY_KEYWORD, POLLING_KEYWORD);
+		prgname, OPT_SOCKET_FILE, OPT_CONFIG,
+		OPT_ZERO_COPY, OPT_POLLING);
 }
 
 static int
@@ -210,11 +216,15 @@ vhost_crypto_parse_args(int argc, char **argv)
 	char **argvopt;
 	int option_index;
 	struct option lgopts[] = {
-			{SOCKET_FILE_KEYWORD, required_argument, 0, 0},
-			{CONFIG_KEYWORD, required_argument, 0, 0},
-			{ZERO_COPY_KEYWORD, no_argument, 0, 0},
-			{POLLING_KEYWORD, no_argument, 0, 0},
-			{NULL, 0, 0, 0}
+		{OPT_SOCKET_FILE, required_argument,
+				NULL, OPT_SOCKET_FILE_NUM},
+		{OPT_CONFIG, required_argument,
+				NULL, OPT_CONFIG_NUM},
+		{OPT_ZERO_COPY, no_argument,
+				NULL, OPT_ZERO_COPY_NUM},
+		{OPT_POLLING, no_argument,
+				NULL, OPT_POLLING_NUM},
+		{NULL, 0, 0, 0}
 	};
 
 	argvopt = argv;
@@ -222,36 +232,40 @@ vhost_crypto_parse_args(int argc, char **argv)
 	while ((opt = getopt_long(argc, argvopt, "s:",
 				  lgopts, &option_index)) != EOF) {
 
+		if (opt == '?') {
+			vhost_crypto_usage(prgname);
+			return -1;
+		}
+
 		switch (opt) {
-		case 0:
-			if (strcmp(lgopts[option_index].name,
-					SOCKET_FILE_KEYWORD) == 0) {
-				ret = parse_socket_arg(optarg);
-				if (ret < 0) {
-					vhost_crypto_usage(prgname);
-					return ret;
-				}
-			} else if (strcmp(lgopts[option_index].name,
-					CONFIG_KEYWORD) == 0) {
-				ret = parse_config(optarg);
-				if (ret < 0) {
-					vhost_crypto_usage(prgname);
-					return ret;
-				}
-			} else if (strcmp(lgopts[option_index].name,
-					ZERO_COPY_KEYWORD) == 0) {
-				options.zero_copy =
-					RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE;
-			} else if (strcmp(lgopts[option_index].name,
-					POLLING_KEYWORD) == 0) {
-				options.guest_polling = 1;
-			} else {
+		case OPT_SOCKET_FILE_NUM:
+			ret = parse_socket_arg(optarg);
+			if (ret < 0) {
 				vhost_crypto_usage(prgname);
-				return -EINVAL;
+				return ret;
+			}
+			break;
+
+		case OPT_CONFIG_NUM:
+			ret = parse_config(optarg);
+			if (ret < 0) {
+				vhost_crypto_usage(prgname);
+				return ret;
 			}
 			break;
+
+		case OPT_ZERO_COPY_NUM:
+			options.zero_copy =
+				RTE_VHOST_CRYPTO_ZERO_COPY_ENABLE;
+			break;
+
+		case OPT_POLLING_NUM:
+			options.guest_polling = 1;
+			break;
+
 		default:
-			return -1;
+			vhost_crypto_usage(prgname);
+			return -EINVAL;
 		}
 	}
 
-- 
2.17.1