args.c

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