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

18 files changed, 28 insertions, 45 deletions

diff --git a/archival/ar.c b/archival/ar.c
index 31e96de4f..e85ca5c6f 100644
--- a/archival/ar.c
+++ b/archival/ar.c
@@ -50,7 +50,7 @@ int ar_main(int argc, char **argv)
         archive_handle = init_handle();
 
         /* Prepend '-' to the first argument if required */
-        opt_complementary = "--:p:t:x:-1:?:p--tx:t--px:x--pt";
+        opt_complementary = "--:p:t:x:-1:p--tx:t--px:x--pt";
         opt = getopt32(argc, argv, "ptxovcr");
 
         if (opt & AR_CTX_PRINT) {
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
diff --git a/debianutils/start_stop_daemon.c b/debianutils/start_stop_daemon.c
index 0681a085c..fd9f60ce9 100644
--- a/debianutils/start_stop_daemon.c
+++ b/debianutils/start_stop_daemon.c
@@ -254,7 +254,7 @@ int start_stop_daemon_main(int argc, char **argv)
 #endif
 
         /* Check required one context option was given */
-        opt_complementary = "K:S:?:K--S:S--K:m?p:K?xpun:S?xa";
+        opt_complementary = "K:S:K--S:S--K:m?p:K?xpun:S?xa";
         opt = getopt32(argc, argv, "KSbqma:n:s:u:c:x:p:"
                 USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:"),
 //              USE_FEATURE_START_STOP_DAEMON_FANCY("ovN:R:"),
diff --git a/editors/cmp.c b/editors/cmp.c
index e5dda80ff..da431f39b 100644
--- a/editors/cmp.c
+++ b/editors/cmp.c
@@ -57,7 +57,7 @@ int cmp_main(int argc, char **argv)
 
         xfunc_error_retval = 2; /* 1 is returned if files are different. */
 
-        opt_complementary = "?:-1"
+        opt_complementary = "-1"
                         USE_DESKTOP(":?4")
                         SKIP_DESKTOP(":?2")
                         ":l--s:s--l";
diff --git a/include/libbb.h b/include/libbb.h
index a8b9b5bcf..b8ec83927 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -588,8 +588,6 @@ void bb_daemonize_or_rexec(int flags, char **argv);
 void bb_sanitize_stdio(void);
 
 
-// TODO: always error out?
-enum { BB_GETOPT_ERROR = 0x80000000 };
 extern const char *opt_complementary;
 #if ENABLE_GETOPT_LONG
 extern const struct option *applet_long_options;
diff --git a/ipsvd/tcpudp.c b/ipsvd/tcpudp.c
index bc3d3a209..492808a6b 100644
--- a/ipsvd/tcpudp.c
+++ b/ipsvd/tcpudp.c
@@ -150,7 +150,7 @@ int tcpudpsvd_main(int argc, char **argv)
         tcp = (applet_name[0] == 't');
 
         /* 3+ args, -i at most once, -p implies -h, -v is counter */
-        opt_complementary = "-3:?:i--i:ph:vv";
+        opt_complementary = "-3:i--i:ph:vv";
 #ifdef SSLSVD
         getopt32(argc, argv, "+c:C:i:x:u:l:Eb:hpt:vU:/:Z:K:",
                 &str_c, &str_C, &instructs, &instructs, &user, &local_hostname,
diff --git a/libbb/getopt32.c b/libbb/getopt32.c
index d4465f899..f5aaa70df 100644
--- a/libbb/getopt32.c
+++ b/libbb/getopt32.c
@@ -217,20 +217,12 @@ Special characters:
         -b, -c and -f are mutally exclusive and should raise an error
         if specified together.  In this case you must set
         opt_complementary = "b--cf:c--bf:f--bc".  If two of the
-        mutually exclusive options are found, getopt32's
-        return value will have the error flag set (BB_GETOPT_ERROR) so
-        that we can check for it:
-
-        if (flags & BB_GETOPT_ERROR)
-                bb_show_usage();
+        mutually exclusive options are found, getopt32 will call
+        bb_show_usage() and die.
 
  "x--x" Variation of the above, it means that -x option should occur
         at most once.
 
- "?"    A "?" as the first char in a opt_complementary group means:
-        if BB_GETOPT_ERROR is detected, don't return, call bb_show_usage
-        and exit instead. Next char after '?' can't be a digit.
-
  "::"   A double colon after a char in opt_complementary means that the
         option can occur multiple times. Each occurrence will be saved as
         a llist_t element instead of char*.
@@ -476,11 +468,8 @@ getopt32(int argc, char **argv, const char *applet_opts, ...)
                         if (on_off->opt == 0 && c != 0)
                                 bb_show_usage();
                 }
-                if (flags & on_off->incongruously) {
-                        if ((spec_flgs & SHOW_USAGE_IF_ERROR))
-                                bb_show_usage();
-                        flags |= BB_GETOPT_ERROR;
-                }
+                if (flags & on_off->incongruously)
+                        bb_show_usage();
                 trigger = on_off->switch_on & on_off->switch_off;
                 flags &= ~(on_off->switch_off ^ trigger);
                 flags |= on_off->switch_on ^ trigger;
diff --git a/miscutils/eject.c b/miscutils/eject.c
index ba7da5c65..8d062d1bb 100644
--- a/miscutils/eject.c
+++ b/miscutils/eject.c
@@ -32,7 +32,7 @@ int eject_main(int argc, char **argv)
         const char *device;
         int dev, cmd;
 
-        opt_complementary = "?:?1:t--T:T--t";
+        opt_complementary = "?1:t--T:T--t";
         flags = getopt32(argc, argv, "tT");
         device = argv[optind] ? : "/dev/cdrom";
 
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 6909e8489..3165c2d68 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -210,7 +210,7 @@ int udhcpc_main(int argc, char **argv)
         client_config.timeout = 3;
 
         /* Parse command line */
-        opt_complementary = "?:c--C:C--c" // mutually exclusive
+        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;
diff --git a/networking/udhcp/dumpleases.c b/networking/udhcp/dumpleases.c
index 01c7c27e8..95df7ea36 100644
--- a/networking/udhcp/dumpleases.c
+++ b/networking/udhcp/dumpleases.c
@@ -33,7 +33,7 @@ int dumpleases_main(int argc, char **argv)
 
         applet_long_options = options;
 #endif
-        opt_complementary = "=0:?:a--r:r--a";
+        opt_complementary = "=0:a--r:r--a";
         opt = getopt32(argc, argv, "arf:", &file);
 
         fd = xopen(file, O_RDONLY);
diff --git a/util-linux/getopt.c b/util-linux/getopt.c
index 06c348895..a5e674368 100644
--- a/util-linux/getopt.c
+++ b/util-linux/getopt.c
@@ -318,7 +318,7 @@ int getopt_main(int argc, char *argv[])
         opt = getopt32(argc, argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg);
 #else
         applet_long_options = longopts;
-        opt_complementary = "?:l::";
+        opt_complementary = "l::";
         opt = getopt32(argc, argv, "+o:n:qQs:Tual:",
                                         &optstr, &name, &s_arg, &l_arg);
         /* Effectuate the read options for the applet itself */
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index 8b65df6a6..882a0c55a 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -189,7 +189,7 @@ int hwclock_main(int argc, char **argv)
         };
         applet_long_options = hwclock_long_options;
 #endif
-        opt_complementary = "?:r--ws:w--rs:s--wr:l--u:u--l";
+        opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
         opt = getopt32(argc, argv, "lurswf:", &rtcname);
 
         /* If -u or -l wasn't given check if we are using utc */