lib/command-line.c

   1 /*
   2  * Copyright (c) 2008 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include "command-line.h"
  19 #include <getopt.h>
  20 #include <limits.h>
  21 #include "util.h"
  22 #include "vlog.h"
  23
  24 /* Given the GNU-style long options in 'options', returns a string that may be
  25  * passed to getopt() with the corresponding short options.  The caller is
  26  * responsible for freeing the string. */
  27 char *
  28 long_options_to_short_options(const struct option options[])
  29 {
  30     char short_options[UCHAR_MAX * 3 + 1];
  31     char *p = short_options;
  32
  33     for (; options->name; options++) {
  34         const struct option *o = options;
  35         if (o->flag == NULL && o->val > 0 && o->val <= UCHAR_MAX) {
  36             *p++ = o->val;
  37             if (o->has_arg == required_argument) {
  38                 *p++ = ':';
  39             } else if (o->has_arg == optional_argument) {
  40                 *p++ = ':';
  41                 *p++ = ':';
  42             }
  43         }
  44     }
  45     *p = '\0';
  46
  47     return xstrdup(short_options);
  48 }
  49