options.c

   1 /*-
   2  * "THE BEER-WARE LICENSE" (Revision 42):
   3  * <tobias.rehbein@web.de> wrote this file. As long as you retain this notice
   4  * you can do whatever you want with this stuff. If we meet some day, and you
   5  * think this stuff is worth it, you can buy me a beer in return.
   6  *                                                              Tobias Rehbein
   7  */
   8
   9 #include <assert.h>
  10 #include <err.h>
  11 #include <getopt.h>
  12 #include <limits.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <sysexits.h>
  16
  17 #include "options.h"
  18
  19 enum {
  20         TIME = 60,
  21         CHOICES = 4,
  22         PLAYERS = 4
  23 };
  24
  25 static const char *VERSION = "v1.0.0";
  26 static const char *OGG123 = "/usr/local/bin/ogg123";
  27 static const char *OGG123_OPTIONS = "";
  28
  29 void            init_options(struct opts_options *opts);
  30 static void     print_usage(void);
  31
  32 void
  33 init_options(struct opts_options *opts)
  34 {
  35         assert(opts != NULL);
  36
  37         opts->time = TIME;
  38         opts->choices = CHOICES;
  39         opts->players = PLAYERS;
  40         opts->ogg123 = OGG123;
  41         opts->ogg123_options = OGG123_OPTIONS;
  42 }
  43
  44 void
  45 opts_parse_options(struct opts_options *opts, int argc, char **argv)
  46 {
  47         int             ch;
  48
  49         assert(opts != NULL);
  50         assert(argc >= 0);
  51         assert(argv != NULL);
  52
  53         struct option   longopts[] = {
  54                 {"time", required_argument, NULL, 't'},
  55                 {"choices", required_argument, NULL, 'c'},
  56                 {"players", required_argument, NULL, 'p'},
  57                 {"ogg123", required_argument, NULL, 'O'},
  58                 {"ogg123-options", required_argument, NULL, 'o'},
  59                 {"help", no_argument, NULL, 'h'}
  60         };
  61
  62         init_options(opts);
  63
  64         while ((ch = getopt_long(argc, argv, "t:c:p:o:e:h", longopts, NULL)) != -1)
  65                 switch (ch) {
  66                 case 't':
  67                         opts->time = (int)strtol(optarg, (char **)NULL, 10);
  68                         break;
  69                 case 'c':
  70                         opts->choices = (int)strtol(optarg, (char **)NULL, 10);
  71                         if (opts->choices < 1 || opts->choices > CHOICES)
  72                                 errx(EX_USAGE, "choices must not exceed %d", CHOICES);
  73                         break;
  74                 case 'p':
  75                         opts->players = (int)strtol(optarg, (char **)NULL, 10);
  76                         if (opts->players < 1 || opts->players > PLAYERS)
  77                                 errx(EX_USAGE, "players must not exceed %d", PLAYERS);
  78                         break;
  79                 case 'O':
  80                         opts->ogg123 = optarg;
  81                         break;
  82                 case 'o':
  83                         opts->ogg123_options = optarg;
  84                         break;
  85                 default:
  86                         print_usage();
  87                         exit(1);
  88                 case 'h':
  89                         print_usage();
  90                         exit(0);
  91                 }
  92 }
  93
  94 static void
  95 print_usage()
  96 {
  97         printf("This is oggquiz %s\n\n", VERSION);
  98         printf("oggquiz [-t | --time seconds] [-c | --choices choices] [-p | --players players]\n");
  99         printf("        [-o | --ogg123-options options] [-O | --ogg123 command]\n\n");
 100         printf("oggquiz {-h | --help}\n");
 101 }