ovs/lib/command-line.c

/*
 * Copyright (c) 2008 Nicira Networks.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <config.h>
#include "command-line.h"
#include <getopt.h>
#include <limits.h>
#include "util.h"
#include "vlog.h"

/* Given the GNU-style long options in 'options', returns a string that may be
 * passed to getopt() with the corresponding short options.  The caller is
 * responsible for freeing the string. */
char *
long_options_to_short_options(const struct option options[])
{
    char short_options[UCHAR_MAX * 3 + 1];
    char *p = short_options;
    
    for (; options->name; options++) {
        const struct option *o = options;
        if (o->flag == NULL && o->val > 0 && o->val <= UCHAR_MAX) {
            *p++ = o->val;
            if (o->has_arg == required_argument) {
                *p++ = ':';
            } else if (o->has_arg == optional_argument) {
                *p++ = ':';
                *p++ = ':';
            }
        }
    }
    *p = '\0';
    
    return xstrdup(short_options);
}