last_patch89 from vodz:

    Manuel,

    I rewrite bb_getopt_ulflags() function for more universal usage.
    My version support now:
    - options with arguments (optional arg as GNU extension also)
    - complementaly and/or incomplementaly and/or incongruously and/or list
    options
    - long_opt (all applets may have long option, add supporting is trivial)
    This realisation full compatibile from your version.
    Code size grow 480 bytes, but only coreutils/* over compensate this size
    after using new function. Last patch reduced over 800 bytes and not full
    applied to all. "mkdir" and "mv" applets have long_opt now for demonstrate
    trivial addition support long_opt with usage new bb_getopt_ulflags().
    Complementaly and/or incomplementaly and/or incongruously and/or list options
    logic is not trivial, but new "cut" and "grep" applets using this logic
    for examples with full demostrating. New "grep" applet reduced over 300
    bytes.

    Mark,
    Also. I removed bug from "grep" applet.
    $ echo a b | busybox grep -e a b
    a b
    a b
    But right is printing one only.

    --w
    vodz

1 files changed, 16 insertions, 10 deletions

diff --git a/coreutils/mkdir.c b/coreutils/mkdir.c
index b018ac181..50364f17f 100644
--- a/coreutils/mkdir.c
+++ b/coreutils/mkdir.c
@@ -31,27 +31,33 @@
 
 #include <stdlib.h>
 #include <unistd.h>
+#include <getopt.h>
 #include "busybox.h"
 
+static const struct option mkdir_long_options[] = {
+        { "mode", 1, NULL, 'm' },
+        { "parents", 0, NULL, 'p' },
+        { 0, 0, 0, 0 }
+};
+
 extern int mkdir_main (int argc, char **argv)
 {
         mode_t mode = (mode_t)(-1);
         int status = EXIT_SUCCESS;
         int flags = 0;
-        int opt;
+        unsigned long opt;
+        char *smode;
 
-        while ((opt = getopt (argc, argv, "m:p")) > 0) {
-                if (opt == 'm') {
+        bb_applet_long_options = mkdir_long_options;
+        opt = bb_getopt_ulflags(argc, argv, "m:p", &smode);
+        if(opt & 1) {
                         mode = 0777;
-                        if (!bb_parse_mode (optarg, &mode)) {
-                                bb_error_msg_and_die ("invalid mode `%s'", optarg);
-                        }
-                } else if (opt == 'p') {
-                        flags |= FILEUTILS_RECUR;
-                } else {
-                        bb_show_usage();
+                if (!bb_parse_mode (smode, &mode)) {
+                        bb_error_msg_and_die ("invalid mode `%s'", smode);
                 }
         }
+        if(opt & 2)
+                flags |= FILEUTILS_RECUR;
 
         if (optind == argc) {
                 bb_show_usage();