libbb: nuke BB_GETOPT_ERROR, always die if there are mutually exclusive options

find_pair                                            164     180     +16
passwd_main                                         1222    1230      +8
display_speed                                         91      96      +5
msh_main                                            1335    1339      +4
qrealloc                                              38      36      -2
refresh                                             1190    1182      -8
cut_main                                             543     532     -11
sendCgi                                             1807    1794     -13
getopt32                                            1063    1045     -18
arith                                               2077    2030     -47
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/6 up/down: 33/-99)            Total: -66 bytes
   text    data     bss     dec     hex filename
 781548    1168   11900  794616   c1ff8 busybox_old
 781452    1168   11900  794520   c1f98 busybox_unstripped

7 files changed, 15 insertions, 19 deletions

diff --git a/coreutils/cp.c b/coreutils/cp.c
index f98f281b5..78bd73c0f 100644
--- a/coreutils/cp.c
+++ b/coreutils/cp.c
@@ -44,7 +44,7 @@ int cp_main(int argc, char **argv)
 	// -P and -d are the same (-P is POSIX, -d is GNU)
 	// -r and -R are the same
 	// -a = -pdR
-	opt_complementary = "?:l--s:s--l:Pd:rR:apdR";
+	opt_complementary = "l--s:s--l:Pd:rR:apdR";
 	flags = getopt32(argc, argv, FILEUTILS_CP_OPTSTR "arPHL");
 	/* Default behavior of cp is to dereference, so we don't have to do
 	 * anything special when we are given -L.
diff --git a/coreutils/cut.c b/coreutils/cut.c
index 084f7be37..435b21070 100644
--- a/coreutils/cut.c
+++ b/coreutils/cut.c
@@ -176,8 +176,6 @@ int cut_main(int argc, char **argv)
 	argv += optind;
 	if (!(option_mask32 & (CUT_OPT_BYTE_FLGS | CUT_OPT_CHAR_FLGS | CUT_OPT_FIELDS_FLGS)))
 		bb_error_msg_and_die("expected a list of bytes, characters, or fields");
-	if (option_mask32 & BB_GETOPT_ERROR)
-		bb_error_msg_and_die("only one type of list may be specified");
 
 	if (option_mask32 & CUT_OPT_DELIM_FLGS) {
 		if (strlen(ltok) > 1) {
diff --git a/coreutils/date.c b/coreutils/date.c
index 1b20cd443..5e2bcee3b 100644
--- a/coreutils/date.c
+++ b/coreutils/date.c
@@ -51,7 +51,7 @@ int date_main(int argc, char **argv)
 	char *isofmt_arg;
 	char *hintfmt_arg;
 
-	opt_complementary = "?:d--s:s--d"
+	opt_complementary = "d--s:s--d"
 		USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
 	opt = getopt32(argc, argv, "Rs:ud:r:"
 			USE_FEATURE_DATE_ISOFMT("I::D:"),
diff --git a/coreutils/dos2unix.c b/coreutils/dos2unix.c
index 86adcd91f..115632f75 100644
--- a/coreutils/dos2unix.c
+++ b/coreutils/dos2unix.c
@@ -20,7 +20,7 @@ enum {
 };
 
 /* if fn is NULL then input is stdin and output is stdout */
-static int convert(char *fn, int ConvType)
+static int convert(char *fn, int conv_type)
 {
 	FILE *in, *out;
 	int i;
@@ -52,7 +52,7 @@ static int convert(char *fn, int ConvType)
 		if (i == '\r')
 			continue;
 		if (i == '\n') {
-			if (ConvType == CT_UNIX2DOS)
+			if (conv_type == CT_UNIX2DOS)
 				fputc('\r', out);
 			fputc('\n', out);
 			continue;
@@ -81,29 +81,27 @@ static int convert(char *fn, int ConvType)
 int dos2unix_main(int argc, char **argv);
 int dos2unix_main(int argc, char **argv)
 {
-	int o, ConvType;
+	int o, conv_type;
 
 	/* See if we are supposed to be doing dos2unix or unix2dos */
 	if (applet_name[0] == 'd') {
-		ConvType = CT_DOS2UNIX;	/* 2 */
+		conv_type = CT_DOS2UNIX;	/* 2 */
 	} else {
-		ConvType = CT_UNIX2DOS;	/* 1 */
+		conv_type = CT_UNIX2DOS;	/* 1 */
 	}
-	/* -u and -d are mutally exclusive */
-	opt_complementary = "?:u--d:d--u";
-	/* process parameters */
-	/* -u convert to unix */
-	/* -d convert to dos  */
+	
+	/* -u convert to unix, -d convert to dos */
+	opt_complementary = "u--d:d--u"; /* mutally exclusive */
 	o = getopt32(argc, argv, "du");
 
 	/* Do the conversion requested by an argument else do the default
 	 * conversion depending on our name.  */
 	if (o)
-		ConvType = o;
+		conv_type = o;
 
 	do {
 		/* might be convert(NULL) if there is no filename given */
-		o = convert(argv[optind], ConvType);
+		o = convert(argv[optind], conv_type);
 		if (o < 0)
 			break;
 		optind++;
diff --git a/coreutils/id.c b/coreutils/id.c
index 9dd5b48d3..27fb26e77 100644
--- a/coreutils/id.c
+++ b/coreutils/id.c
@@ -49,7 +49,7 @@ int id_main(int argc, char **argv)
 #endif
 	/* Don't allow -n -r -nr -ug -rug -nug -rnug */
 	/* Don't allow more than one username */
-	opt_complementary = "?1:?:u--g:g--u:r?ug:n?ug" USE_SELINUX(":u--Z:Z--u:g--Z:Z--g");
+	opt_complementary = "?1:u--g:g--u:r?ug:n?ug" USE_SELINUX(":u--Z:Z--u:g--Z:Z--g");
 	flags = getopt32(argc, argv, "rnug" USE_SELINUX("Z"));
 
 	/* This values could be overwritten later */
diff --git a/coreutils/install.c b/coreutils/install.c
index 5503b55cd..8d71fa070 100644
--- a/coreutils/install.c
+++ b/coreutils/install.c
@@ -99,7 +99,7 @@ int install_main(int argc, char **argv)
 #if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
 	applet_long_options = install_long_options;
 #endif
-	opt_complementary = "?:s--d:d--s" USE_SELINUX(":Z--\xff:\xff--Z");
+	opt_complementary = "s--d:d--s" USE_SELINUX(":Z--\xff:\xff--Z");
 	/* -c exists for backwards compatibility, it's needed */
 
 	flags = getopt32(argc, argv, "cdpsg:m:o:" USE_SELINUX("Z:"),
diff --git a/coreutils/sort.c b/coreutils/sort.c
index f41bd6329..6371139cb 100644
--- a/coreutils/sort.c
+++ b/coreutils/sort.c
@@ -288,7 +288,7 @@ int sort_main(int argc, char **argv)
 
 	/* Parse command line options */
 	/* -o and -t can be given at most once */
-	opt_complementary = "?:o--o:t--t:" /* -t, -o: maximum one of each */
+	opt_complementary = "o--o:t--t:" /* -t, -o: maximum one of each */
 			"k::"; /* -k takes list */
 	getopt32(argc, argv, OPT_STR, &str_ignored, &str_ignored, &str_o, &lst_k, &str_t);
 #if ENABLE_FEATURE_SORT_BIG