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

loginutils/addgroup.c

@@ -122,6 +122,17 @@ static int addgroup(const char *filename, char *group, gid_t gid, const char *us
 	return 0;
 }
 
+#ifndef CONFIG_ADDUSER
+static inline void if_i_am_not_root(void)
+{
+	if (geteuid()) {
+		bb_error_msg_and_die( "Only root may add a user or group to the system.");
+	}
+}
+#else
+extern void if_i_am_not_root(void);
+#endif
+
 /*
  * addgroup will take a login_name as its first parameter.
  *
@@ -131,21 +142,13 @@ static int addgroup(const char *filename, char *group, gid_t gid, const char *us
  * ________________________________________________________________________ */
 int addgroup_main(int argc, char **argv)
 {
-	int opt;
 	char *group;
 	char *user;
 	gid_t gid = 0;
 
 	/* get remaining args */
-	while ((opt = getopt (argc, argv, "g:")) != -1) {
-		switch (opt) {
-			case 'g':
-				gid = strtol(optarg, NULL, 10);
-				break;
-			default:
-				bb_show_usage();
-				break;
-		}
+	if(bb_getopt_ulflags(argc, argv, "g:", &group)) {
+		gid = strtol(group, NULL, 10);
 	}
 
 	if (optind < argc) {
@@ -161,14 +164,8 @@ int addgroup_main(int argc, char **argv)
 	} else {
 		user = "";
 	}
-	
-	if (geteuid() != 0) {
-		bb_error_msg_and_die
-			("Only root may add a group to the system.");
-	}
+	if_i_am_not_root();
 
 	/* werk */
 	return addgroup(bb_path_group_file, group, gid, user);
 }
-
-/* $Id: addgroup.c,v 1.10 2003/03/19 09:12:20 mjn3 Exp $ */