rework long option handling. saves ~1.2k

function                                             old     new   delta
tar_longopts                                           -     222    +222
static.udhcpc_longopts                                 -     192    +192
start_stop_daemon_longopts                             -     150    +150
getopt32                                            1045    1185    +140
static.wget_longopts                                   -     111    +111
static.od_longopts                                     -     105    +105
getopt_longopts                                        -      96     +96
install_longopts                                       -      67     +67
ipcalc_longopts                                        -      63     +63
static.hwclock_longopts                                -      54     +54
ftpgetput_longopts                                     -      52     +52
static.dumpleases_longopts                             -      32     +32
env_longopts                                           -      31     +31
runparts_longopts                                      -      30     +30
mv_longopts                                            -      24     +24
mkdir_longopts                                         -      19     +19
find_pair                                            164     180     +16
bb_null_long_options                                   -      16     +16
setconsole_longopts                                    -      10     +10
display_speed                                         91      98      +7
collect_blk                                          467     474      +7
show_color                                             4       1      -3
ls_main                                              913     904      -9
bb_default_long_options                               16       -     -16
ls_color_opt                                          32      10     -22
setconsole_long_options                               32       -     -32
arith                                               2077    2030     -47
mv_long_options                                       48       -     -48
mkdir_long_options                                    48       -     -48
env_long_options                                      48       -     -48
static.options                                       248     184     -64
runparts_long_options                                 80       -     -80
ftpgetput_long_options                                96       -     -96
static.hwclock_long_options                          112       -    -112
install_long_options                                 112       -    -112
static.long_options                                  144       -    -144
static.wget_long_options                             160       -    -160
longopts                                             160       -    -160
static.arg_options                                   304       -    -304
tar_long_options                                     320       -    -320
long_options                                         384       -    -384
------------------------------------------------------------------------------
(add/remove: 17/15 grow/shrink: 4/5 up/down: 1444/-2209)     Total: -765 bytes
   text    data     bss     dec     hex filename
 782618    1328   11900  795846   c24c6 busybox_old
 781354    1328   11900  794582   c1fd6 busybox_unstripped

1 files changed, 21 insertions, 22 deletions

diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 3165c2d..2b95c32 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -181,27 +181,26 @@ int udhcpc_main(int argc, char **argv)
 		OPT_v = 1 << 17,
 	};
 #if ENABLE_GETOPT_LONG
-	static const struct option arg_options[] = {
-		{ "clientid",   required_argument,      0, 'c' },
-		{ "clientid-none", no_argument,         0, 'C' },
-		{ "vendorclass", required_argument,     0, 'V' },
-		{ "foreground", no_argument,            0, 'f' },
-		{ "background", no_argument,            0, 'b' },
-		{ "hostname",   required_argument,      0, 'H' },
-		{ "hostname",   required_argument,      0, 'h' },
-		{ "fqdn",       required_argument,      0, 'F' },
-		{ "interface",  required_argument,      0, 'i' },
-		{ "now",        no_argument,            0, 'n' },
-		{ "pidfile",    required_argument,      0, 'p' },
-		{ "quit",       no_argument,            0, 'q' },
-		{ "release",    no_argument,            0, 'R' },
-		{ "request",    required_argument,      0, 'r' },
-		{ "script",     required_argument,      0, 's' },
-		{ "timeout",    required_argument,      0, 'T' },
-		{ "version",    no_argument,            0, 'v' },
-		{ "retries",    required_argument,      0, 't' },
-		{ 0, 0, 0, 0 }
-	};
+	static const char udhcpc_longopts[] =
+		"clientid\0"      Required_argument "c"
+		"clientid-none\0" No_argument       "C"
+		"vendorclass\0"   Required_argument "V"
+		"foreground\0"    No_argument       "f"
+		"background\0"    No_argument       "b"
+		"hostname\0"      Required_argument "H"
+		"hostname\0"      Required_argument "h"
+		"fqdn\0"          Required_argument "F"
+		"interface\0"     Required_argument "i"
+		"now\0"           No_argument       "n"
+		"pidfile\0"       Required_argument "p"
+		"quit\0"          No_argument       "q"
+		"release\0"       No_argument       "R"
+		"request\0"       Required_argument "r"
+		"script\0"        Required_argument "s"
+		"timeout\0"       Required_argument "T"
+		"version\0"       No_argument       "v"
+		"retries\0"       Required_argument "t"
+		"\0";
 #endif
 	/* Default options. */
 	client_config.interface = "eth0";
@@ -213,7 +212,7 @@ int udhcpc_main(int argc, char **argv)
 	opt_complementary = "c--C:C--c" // mutually exclusive
 	                    ":hH:Hh"; // -h and -H are the same
 #if ENABLE_GETOPT_LONG
-	applet_long_options = arg_options;
+	applet_long_options = udhcpc_longopts;
 #endif
 	opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:v",
 		&str_c, &str_V, &str_h, &str_h, &str_F,