dabbad/help.c

   1 /* __LICENSE_HEADER_BEGIN__ */
   2
   3 /*
   4  * Copyright (C) 2012   Emmanuel Roullit <emmanuel.roullit@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  */
  21
  22 /* __LICENSE_HEADER_END__ */
  23
  24 #include <stdio.h>
  25 #include <assert.h>
  26 #include <getopt.h>
  27
  28 static const char _usage[] =
  29     "usage: dabbad [<args>]\n\n" "The available options are:\n";
  30
  31 void show_usage(const struct option const *opt)
  32 {
  33         assert(opt);
  34
  35         printf("%s", _usage);
  36
  37         if (opt != NULL) {
  38                 while (opt->name != NULL) {
  39                         printf("  --%s", opt->name);
  40                         if (opt->has_arg == required_argument)
  41                                 printf(" <arg>\n");
  42                         else if (opt->has_arg == optional_argument)
  43                                 printf(" [arg]\n");
  44                         else
  45                                 printf("\n");
  46                         opt++;
  47                 }
  48         }
  49 }