vconfig: fix help text; small code shrink. Closes 4658

function                                             old     new   delta
xfind_str                                             45      46      +1
vconfig_main                                         228     223      -5
packed_usage                                       28980   28954     -26

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/vconfig.c

@@ -13,12 +13,12 @@
 //usage:       "COMMAND [OPTIONS]"
 //usage:#define vconfig_full_usage "\n\n"
 //usage:       "Create and remove virtual ethernet devices\n"
-//usage:     "\n	add		[interface-name] [vlan_id]"
+//usage:     "\n	add		IFACE VLAN_ID"
-//usage:     "\n	rem		[vlan-name]"
+//usage:     "\n	rem		VLAN_NAME"
-//usage:     "\n	set_flag	[interface-name] [flag-num] [0 | 1]"
+//usage:     "\n	set_flag	IFACE 0|1 VLAN_QOS"
-//usage:     "\n	set_egress_map	[vlan-name] [skb_priority] [vlan_qos]"
+//usage:     "\n	set_egress_map	VLAN_NAME SKB_PRIO VLAN_QOS"
-//usage:     "\n	set_ingress_map	[vlan-name] [skb_priority] [vlan_qos]"
+//usage:     "\n	set_ingress_map	VLAN_NAME SKB_PRIO VLAN_QOS"
-//usage:     "\n	set_name_type	[name-type]"
+//usage:     "\n	set_name_type	NAME_TYPE"
 
 #include "libbb.h"
 #include <net/if.h>
@@ -66,54 +66,38 @@ struct vlan_ioctl_args {
  * The return value is the last data entry for the matching string. */
 static const char *xfind_str(const char *table, const char *str)
 {
-	while (strcasecmp(str, table+1) != 0) {
+	while (strcasecmp(str, table + 1) != 0) {
-		table += table[0];
+		if (!table[0])
-		if (!*table) {
 			bb_show_usage();
-		}
+		table += table[0];
 	}
 	return table - 1;
 }
 
 static const char cmds[] ALIGN1 = {
 	4, ADD_VLAN_CMD, 7,
-	'a', 'd', 'd', 0,
+	'a','d','d',0,
 	3, DEL_VLAN_CMD, 7,
-	'r', 'e', 'm', 0,
+	'r','e','m',0,
 	3, SET_VLAN_NAME_TYPE_CMD, 17,
-	's', 'e', 't', '_',
+	's','e','t','_','n','a','m','e','_','t','y','p','e',0,
-	'n', 'a', 'm', 'e', '_',
-	't', 'y', 'p', 'e', 0,
 	5, SET_VLAN_FLAG_CMD, 12,
-	's', 'e', 't', '_',
+	's','e','t','_','f','l','a','g',0,
-	'f', 'l', 'a', 'g', 0,
 	5, SET_VLAN_EGRESS_PRIORITY_CMD, 18,
-	's', 'e', 't', '_',
+	's','e','t','_','e','g','r','e','s','s','_','m','a','p',0,
-	'e', 'g', 'r', 'e', 's', 's', '_',
+	5, SET_VLAN_INGRESS_PRIORITY_CMD, 0,
-	'm', 'a', 'p', 0,
+	's','e','t','_','i','n','g','r','e','s','s','_','m','a','p',0,
-	5, SET_VLAN_INGRESS_PRIORITY_CMD, 16,
-	's', 'e', 't', '_',
-	'i', 'n', 'g', 'r', 'e', 's', 's', '_',
-	'm', 'a', 'p', 0,
 };
 
 static const char name_types[] ALIGN1 = {
 	VLAN_NAME_TYPE_PLUS_VID, 16,
-	'V', 'L', 'A', 'N',
+	'V','L','A','N','_','P','L','U','S','_','V','I','D',0,
-	'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
-	0,
 	VLAN_NAME_TYPE_PLUS_VID_NO_PAD, 22,
-	'V', 'L', 'A', 'N',
+	'V','L','A','N','_','P','L','U','S','_','V','I','D','_','N','O','_','P','A','D',0,
-	'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
-	'_', 'N', 'O', '_', 'P', 'A', 'D', 0,
 	VLAN_NAME_TYPE_RAW_PLUS_VID, 15,
-	'D', 'E', 'V',
+	'D','E','V','_','P','L','U','S','_','V','I','D',0,
-	'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
+	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, 0,
-	0,
+	'D','E','V','_','P','L','U','S','_','V','I','D','_','N','O','_','P','A','D',0,
-	VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD, 20,
-	'D', 'E', 'V',
-	'_', 'P', 'L', 'U', 'S', '_', 'V', 'I', 'D',
-	'_', 'N', 'O', '_', 'P', 'A', 'D', 0,
 };
 
 int vconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
@@ -123,21 +107,19 @@ int vconfig_main(int argc, char **argv)
 	const char *p;
 	int fd;
 
-	if (argc < 3) {
-		bb_show_usage();
-	}
-
 	memset(&ifr, 0, sizeof(ifr));
 
 	++argv;
-	p = xfind_str(cmds+2, *argv);
+	if (!argv[0])
-	ifr.cmd = *p;
+		bb_show_usage();
-	if (argc != p[-1]) {
+	p = xfind_str(cmds + 2, argv[0]);
+	ifr.cmd = *p;
+	if (argc != p[-1])
 		bb_show_usage();
-	}
 
-	if (ifr.cmd == SET_VLAN_NAME_TYPE_CMD) { /* set_name_type */
+	if (ifr.cmd == SET_VLAN_NAME_TYPE_CMD) {
-		ifr.u.name_type = *xfind_str(name_types+1, argv[1]);
+		/* set_name_type */
+		ifr.u.name_type = *xfind_str(name_types + 1, argv[1]);
 	} else {
 		strncpy_IFNAMSIZ(ifr.device1, argv[1]);
 		p = argv[2];
@@ -146,22 +128,26 @@ int vconfig_main(int argc, char **argv)
 		 * since ifr.u.flag, ifr.u.VID, and ifr.u.skb_priority are all same-sized
 		 * (unsigned) int members of a unions.  But because of the range checking,
 		 * doing so wouldn't save that much space and would also make maintainence
-		 * more of a pain. */
+		 * more of a pain.
-		if (ifr.cmd == SET_VLAN_FLAG_CMD) { /* set_flag */
+		 */
-			ifr.u.flag = xatoul_range(p, 0, 1);
+		if (ifr.cmd == SET_VLAN_FLAG_CMD) {
+			/* set_flag */
+			ifr.u.flag = xatou_range(p, 0, 1);
 			/* DM: in order to set reorder header, qos must be set */
-			ifr.vlan_qos = xatoul_range(argv[3], 0, 7);
+			ifr.vlan_qos = xatou_range(argv[3], 0, 7);
-		} else if (ifr.cmd == ADD_VLAN_CMD) { /* add */
+		} else if (ifr.cmd == ADD_VLAN_CMD) {
-			ifr.u.VID = xatoul_range(p, 0, VLAN_GROUP_ARRAY_LEN-1);
+			/* add */
-		} else if (ifr.cmd != DEL_VLAN_CMD) { /* set_{egress|ingress}_map */
+			ifr.u.VID = xatou_range(p, 0, VLAN_GROUP_ARRAY_LEN - 1);
+		} else if (ifr.cmd != DEL_VLAN_CMD) {
+			/* set_{egress|ingress}_map */
 			ifr.u.skb_priority = xatou(p);
-			ifr.vlan_qos = xatoul_range(argv[3], 0, 7);
+			ifr.vlan_qos = xatou_range(argv[3], 0, 7);
 		}
 	}
 
 	fd = xsocket(AF_INET, SOCK_STREAM, 0);
 	ioctl_or_perror_and_die(fd, SIOCSIFVLAN, &ifr,
-						"ioctl error for %s", *argv);
+						"ioctl error for %s", argv[0]);
 
 	return 0;
 }