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, 137 insertions, 8 deletions

diff --git a/libbb/getopt_ulflags.c b/libbb/getopt_ulflags.c
index 91de392..9bf8c05 100644
--- a/libbb/getopt_ulflags.c
+++ b/libbb/getopt_ulflags.c
@@ -1,8 +1,8 @@
 /* vi: set sw=4 ts=4: */
 /*
- * getopt_ulflags implementation for busybox
+ * universal getopt_ulflags implementation for busybox
  *
- * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
+ * Copyright (C) 2003  Vladimir Oleynik  <dzo@simtreas.ru>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -22,20 +22,149 @@
 
 #include <getopt.h>
 #include <string.h>
+#include <assert.h>
+#include <stdlib.h>
 #include "libbb.h"
 
-unsigned long bb_getopt_ulflags(int argc, char **argv, const char *applet_opts)
+/*
+You can set bb_opt_complementaly as string with one or more
+complementaly or incongruously options.
+If sequential founded option haved from this string
+then your incongruously pairs unsets and complementaly make add sets.
+Format:
+one char - option for check,
+chars - complementaly option for add sets.
+- chars - option triggered for unsets.
+~ chars - option incongruously.
+*       - option list, called add_to_list(*ptr_from_usaged, optarg)
+:       - separator.
+Example: du applet can have options "-s" and "-d size"
+If getopt found -s then -d option flag unset or if found -d then -s unset.
+For this result you must set bb_opt_complementaly = "s-d:d-s".
+Result have last option flag only from called arguments.
+Warning! You can check returned flag, pointer to "d:" argument seted
+to own optarg always.
+Example two: cut applet must only one type of list may be specified,
+and -b, -c and -f incongruously option, overwited option is error also.
+You must set bb_opt_complementaly = "b~bcf:c~bcf:f~bcf".
+If called have more one specified, return value have error flag -
+high bite set (0x80000000UL).
+Example three: grep applet can have one or more "-e pattern" arguments.
+You should use bb_getopt_ulflags() as
+llist_t *paterns;
+bb_opt_complementaly = "e*";
+bb_getopt_ulflags (argc, argv, "e:", &paterns);
+*/
+
+const char *bb_opt_complementaly;
+
+typedef struct
+{
+	char opt;
+	char list_flg;
+	unsigned long switch_on;
+	unsigned long switch_off;
+	unsigned long incongruously;
+	void **optarg;              /* char **optarg or llist_t **optarg */
+} t_complementaly;
+
+/* You can set bb_applet_long_options for parse called long options */
+
+static const struct option bb_default_long_options[] = {
+     /*   { "help", 0, NULL, '?' }, */
+	{ 0, 0, 0, 0 }
+};
+
+const struct option *bb_applet_long_options = bb_default_long_options;
+
+
+unsigned long
+bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
 {
 	unsigned long flags = 0;
+  int c = 0;
 	const char *s;
-	int c;
+  t_complementaly *complementaly;
+  t_complementaly *on_off;
+  va_list p;
+
+  va_start (p, applet_opts);
 
-	while ((c = getopt(argc, argv, applet_opts)) > 0) {
-		if (!(s = strchr(applet_opts, c))) {
-			bb_show_usage();
+  for (s = applet_opts; *s; s++) {
+	c++;
+	while (s[1] == ':') {
+	    /* check GNU extension "o::" - optional arg */
+	    s++;
+	}
+  }
+  complementaly = xcalloc (c + 1, sizeof (t_complementaly));
+  c = 0;
+  for (s = applet_opts; *s; s++) {
+	complementaly->opt = *s;
+	complementaly->switch_on |= (1 << c);
+	c++;
+	if (s[1] == ':') {
+	  complementaly->optarg = va_arg (p, void **);
+	  do
+		s++;
+	  while (s[1] == ':');
 		}
-		flags |= (1 << (s-applet_opts));
+	complementaly++;
 	}
+  complementaly->opt = 0;
+  complementaly -= c;
+  c = 0;
+  for (s = bb_opt_complementaly; s && *s; s++) {
+    t_complementaly *pair;
+
+    if (*s == ':') {
+	  c = 0;
+	  continue;
+    }
+    if (c)
+	  continue;
+    for (on_off = complementaly; on_off->opt; on_off++)
+	  if (on_off->opt == *s)
+	    break;
+    pair = on_off;
+    for(s++; *s && *s != ':'; s++) {
+      if (*s == '-' || *s == '~') {
+	  c = *s;
+      } else if(*s == '*') {
+	pair->list_flg++;
+      } else {
+	  unsigned long *pair_switch = &(pair->switch_on);
 
+	  if(c)
+	    pair_switch = c == '-' ? &(pair->switch_off) : &(pair->incongruously);
+	  for (on_off = complementaly; on_off->opt; on_off++)
+	    if (on_off->opt == *s) {
+		  *pair_switch |= on_off->switch_on;
+		  break;
+	    }
+      }
+    }
+    s--;
+  }
+
+  while ((c = getopt_long (argc, argv, applet_opts,
+			    bb_applet_long_options, NULL)) > 0) {
+
+	for (on_off = complementaly; on_off->opt != c; on_off++) {
+	    if(!on_off->opt)
+		bb_show_usage ();
+	}
+	if(flags & on_off->incongruously)
+	    flags |= 0x80000000UL;
+	flags &= ~on_off->switch_off;
+	flags |= on_off->switch_on;
+	if(on_off->list_flg) {
+	   *(llist_t **)(on_off->optarg) =
+		llist_add_to(*(llist_t **)(on_off->optarg), optarg);
+	} else if (on_off->optarg) {
+	    *(char **)(on_off->optarg) = optarg;
+	}
+  }
+  free(complementaly);
 	return flags;
 }