git.mutantstargoat.com Git - andemo/blob - src/cfgopt.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <ctype.h>
   5 #include "cfgopt.h"
   6
   7 #ifdef NDEBUG
   8 /* release default options */
   9 #define DEFOPT_FULLSCR  1
  10 #define DEFOPT_VSYNC    1
  11 #define DEFOPT_MUSIC    1
  12 #else
  13 /* debug default options */
  14 #define DEFOPT_FULLSCR  0
  15 #define DEFOPT_VSYNC    1
  16 #define DEFOPT_MUSIC    0
  17 #endif
  18
  19 struct options opt = {
  20         0,      /* screen name */
  21         DEFOPT_FULLSCR,
  22         DEFOPT_VSYNC,
  23         DEFOPT_MUSIC
  24 };
  25
  26 static const char *usagefmt = "Usage: %s [options]\n"
  27         "Options:\n"
  28         "  -music/-nomusic      toggle music playback\n"
  29         "  -scr,-screen <name>  ignore demoscript, run specific screen\n"
  30         "  -fs/-win             run fullscreen/windowed\n"
  31         "  -vsync/-novsync      toggle vsync\n"
  32         "  -h,-help             print usage and exit\n";
  33
  34 int parse_args(int argc, char **argv)
  35 {
  36         int i;
  37         char *scrname = 0;
  38
  39         for(i=1; i<argc; i++) {
  40                 if(argv[i][0] == '-') {
  41                         if(strcmp(argv[i], "-music") == 0) {
  42                                 opt.music = 1;
  43                         } else if(strcmp(argv[i], "-nomusic") == 0) {
  44                                 opt.music = 0;
  45                         } else if(strcmp(argv[i], "-scr") == 0 || strcmp(argv[i], "-screen") == 0) {
  46                                 scrname = argv[++i];
  47                         } else if(strcmp(argv[i], "-vsync") == 0) {
  48                                 opt.vsync = 1;
  49                         } else if(strcmp(argv[i], "-novsync") == 0) {
  50                                 opt.vsync = 0;
  51                         } else if(strcmp(argv[i], "-fs") == 0) {
  52                                 opt.fullscreen = 1;
  53                         } else if(strcmp(argv[i], "-win") == 0) {
  54                                 opt.fullscreen = 0;
  55                         } else if(strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "-help") == 0) {
  56                                 printf(usagefmt, argv[0]);
  57                                 exit(0);
  58                         } else {
  59                                 fprintf(stderr, "invalid option: %s\n", argv[i]);
  60                                 fprintf(stderr, usagefmt, argv[0]);
  61                                 return -1;
  62                         }
  63                 } else {
  64                         if(scrname) {
  65                                 fprintf(stderr, "unexpected option: %s\n", argv[i]);
  66                                 fprintf(stderr, usagefmt, argv[0]);
  67                                 return -1;
  68                         }
  69                         scrname = argv[i];
  70                 }
  71         }
  72
  73         if(scrname) {
  74                 opt.scrname = scrname;
  75         }
  76         return 0;
  77 }
  78
  79
  80 static char *strip_space(char *s)
  81 {
  82         int len;
  83         char *end;
  84
  85         while(*s && isspace(*s)) ++s;
  86         if(!*s) return 0;
  87
  88         if((end = strrchr(s, '#'))) {
  89                 --end;
  90         } else {
  91                 len = strlen(s);
  92                 end = s + len - 1;
  93         }
  94
  95         while(end > s && isspace(*end)) *end-- = 0;
  96         return end > s ? s : 0;
  97 }
  98
  99 static int bool_value(char *s)
 100 {
 101         char *ptr = s;
 102         while(*ptr) {
 103                 *ptr = tolower(*ptr);
 104                 ++ptr;
 105         }
 106
 107         return strcmp(s, "true") == 0 || strcmp(s, "yes") == 0 || strcmp(s, "1") == 0;
 108 }
 109
 110 int load_config(const char *fname)
 111 {
 112         FILE *fp;
 113         char buf[256];
 114         int nline = 0;
 115
 116         if(!(fp = fopen(fname, "rb"))) {
 117                 return 0;       /* just ignore missing config files */
 118         }
 119
 120         while(fgets(buf, sizeof buf, fp)) {
 121                 char *line, *key, *value;
 122
 123                 ++nline;
 124                 if(!(line = strip_space(buf))) {
 125                         continue;
 126                 }
 127
 128                 if(!(value = strchr(line, '='))) {
 129                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 130                         return -1;
 131                 }
 132                 *value++ = 0;
 133
 134                 if(!(key = strip_space(line)) || !(value = strip_space(value))) {
 135                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 136                         return -1;
 137                 }
 138
 139                 if(strcmp(line, "music") == 0) {
 140                         opt.music = bool_value(value);
 141                 } else if(strcmp(line, "screen") == 0) {
 142                         opt.scrname = strdup(value);
 143                 } else if(strcmp(line, "vsync") == 0) {
 144                         opt.vsync = bool_value(value);
 145                 } else if(strcmp(line, "fullscreen") == 0) {
 146                         opt.fullscreen = bool_value(value);
 147                 } else {
 148                         fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line);
 149                         return -1;
 150                 }
 151         }
 152         return 0;
 153 }