args.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include "args.h"
   5 #include "config.h"
   6
   7 // Gameplay Variations
   8 float opt_bounciness;
   9 float opt_gamespeed;
  10 float opt_max_lead;
  11
  12 // Look and Feel
  13 int opt_fullscreen;
  14 int opt_music;
  15 int opt_sound;
  16
  17 static void
  18 show_help(void)
  19 {
  20         puts("Dodge the rocks until you die.");
  21         putchar('\n');
  22         puts(" Gameplay Variations:");
  23     puts("  -b, --bounciness=N%        Keep N% of speed when hitting edges (default 50%)");
  24         puts("  -g, --game-speed=N%        50-200% (default 100%)");
  25         putchar('\n');
  26         puts(" Look and Feel:");
  27         puts("  -f, --full-screen");
  28         puts("  -m, --music                Enable music");
  29         puts("  -s, --silent               No explosion sounds or music");
  30         putchar('\n');
  31         puts(" Informational:");
  32         puts("  -?, --help                 Give this help list");
  33         puts("  -V, --version              Print program version");
  34         putchar('\n');
  35         puts("Mandatory or optional arguments to long options are also mandatory or optional");
  36         puts("for any corresponding short options.");
  37         putchar('\n');
  38         puts("Report bugs at http://jasonwoof.com/contact.html");
  39 }
  40
  41 int
  42 short_opt(char c, char *arg)
  43 {
  44         int i;
  45
  46         switch(c) {
  47                 case 'b': if(!arg || sscanf(arg, "%d%%", &i) != 1 || i < 0 || i > 100) {
  48                                           fprintf(stderr, "bad --bounciness (-b) value (should be 0-100%%)\n\n");
  49                                           return 0;
  50                                   }
  51                                   opt_bounciness = (float)i / 100;
  52                                   *arg = 0;
  53                                   break;
  54                 case 'f': opt_fullscreen = 1; break;
  55                 case 'g': if(!arg || sscanf(arg, "%d%%", &i) != 1 || i < 50 || i > 200) {
  56                                           fprintf(stderr, "bad --game-speed (-g) value (should be 50-200%%)\n\n");
  57                                           return 0;
  58                                   }
  59                                   opt_gamespeed = (float)i / 100;
  60                                   *arg = 0;
  61                                   break;
  62                 case 'l': if(sscanf(arg, "%f", &opt_max_lead) != 1) {
  63                                           fprintf(stderr, "bad --max-lead (-l) value (must be a number)\n\n");
  64                                           return 0;
  65                                   }
  66                                   opt_max_lead *= XSIZE;
  67                                   *arg = 0;
  68                                   break;
  69                 case 'm': opt_music = 1; break;
  70                 case 's': opt_sound = 0; opt_music = 0; break;
  71                 case 'V':
  72                                   printf("Variations on Rockdodger %s\n", VERSION);
  73                                   exit(0);
  74                 case '?':
  75                 case 'h': return 0;
  76                 default:
  77                                   fprintf(stderr, "unknown option -%c\n\n", c);
  78                                   return 0;
  79         }
  80         return 1;
  81 }
  82
  83 int
  84 parse_short_opts(const char *s, char *arg)
  85 {
  86         while(s[1]) if(!short_opt(*s++, NULL)) return 0;
  87         return short_opt(*s, arg);
  88 }
  89
  90 static char *long_opts[] = {
  91         "bounciness", "game-speed",
  92         "full-screen", "music", "silent",
  93         "help", "version"
  94 };
  95
  96 static char short_opts[] = {
  97         'b', 'g',
  98         'f', 'm', 's',
  99         'h', 'V'
 100 };
 101
 102 int
 103 parse_long_opt(const char *s, char *arg)
 104 {
 105         int i;
 106         for(i=0; i<sizeof(short_opts); i++) {
 107                 if(strcmp(s, long_opts[i]) == 0)
 108                         return short_opt(short_opts[i], arg);
 109         }
 110         fprintf(stderr, "unknown long option --%s\n\n", s);
 111         return 0;
 112 }
 113
 114 void
 115 init_opts(void)
 116 {
 117         // Gameplay Variations
 118         opt_bounciness = 0.50; // lose 50% when you hit the screen edge.
 119         opt_gamespeed = 1.00; // Run game at full speed.
 120         opt_max_lead = 1.00*XSIZE;  // you can get 1 screen ahead.
 121
 122         // Look and Feel
 123         opt_fullscreen = 0;
 124         opt_sound = 1;
 125         opt_music = 1;
 126 }
 127
 128 int
 129 parse_opts(int argc, char *argv[])
 130 {
 131         int i;
 132         char *r;
 133
 134         init_opts();
 135         for(i=1; i<argc; i++) {
 136                 char *s, *arg;
 137                 s = argv[i]; if(!*s) continue;
 138                 if(*s++ != '-') {
 139                         fputs("not an option\n\n", stderr);
 140                         show_help();
 141                         return 0;
 142                 }
 143
 144                 arg = NULL;
 145                 for(r=s; *r; r++) if(*r == '=') { *r = 0; arg = r+1; break; }
 146                 if(!arg && (i+1 < argc)) arg = argv[i+1];
 147
 148                 if(*s == '-') {
 149                         if(!parse_long_opt(s+1, arg)) { show_help(); return 0; }
 150                 } else {
 151                    if(!parse_short_opts(s, arg)) { show_help(); return 0; }
 152                 }
 153         }
 154         return 1;
 155 }