git.mutantstargoat.com Git - dosdemo/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 build default options */
   9 struct options opt = {
  10         0,      /* start_scr */
  11         1,      /* music */
  12         0,      /* sball */
  13         1,      /* vsync */
  14         0       /* dbginfo */
  15 };
  16 #else
  17 /* debug build default options */
  18 struct options opt = {
  19         0,      /* start_scr */
  20         0,      /* music */
  21         0,      /* sball */
  22         1,      /* vsync */
  23         1       /* dbginfo */
  24 };
  25 #endif
  26
  27 int parse_args(int argc, char **argv)
  28 {
  29         int i;
  30         char *scrname = 0;
  31
  32         for(i=1; i<argc; i++) {
  33                 if(argv[i][0] == '-') {
  34                         if(strcmp(argv[i], "-music") == 0) {
  35                                 opt.music = 1;
  36                         } else if(strcmp(argv[i], "-nomusic") == 0) {
  37                                 opt.music = 0;
  38                         } else if(strcmp(argv[i], "-scr") == 0 || strcmp(argv[i], "-screen") == 0) {
  39                                 scrname = argv[++i];
  40                         } else if(strcmp(argv[i], "-sball") == 0) {
  41                                 opt.sball = !opt.sball;
  42                         } else if(strcmp(argv[i], "-vsync") == 0) {
  43                                 opt.vsync = 1;
  44                         } else if(strcmp(argv[i], "-novsync") == 0) {
  45                                 opt.vsync = 0;
  46                         } else if(strcmp(argv[i], "-dbg") == 0) {
  47                                 opt.dbginfo = 1;
  48                         } else if(strcmp(argv[i], "-nodbg") == 0) {
  49                                 opt.dbginfo = 0;
  50                         } else {
  51                                 fprintf(stderr, "invalid option: %s\n", argv[i]);
  52                                 return -1;
  53                         }
  54                 } else {
  55                         if(scrname) {
  56                                 fprintf(stderr, "unexpected option: %s\n", argv[i]);
  57                                 return -1;
  58                         }
  59                         scrname = argv[i];
  60                 }
  61         }
  62
  63         if(scrname) {
  64                 opt.start_scr = scrname;
  65         }
  66         return 0;
  67 }
  68
  69 static char *strip_space(char *s)
  70 {
  71         int len;
  72         char *end;
  73
  74         while(*s && isspace(*s)) ++s;
  75         if(!*s) return 0;
  76
  77         if((end = strrchr(s, '#'))) {
  78                 --end;
  79         } else {
  80                 len = strlen(s);
  81                 end = s + len - 1;
  82         }
  83
  84         while(end > s && isspace(*end)) *end-- = 0;
  85         return end > s ? s : 0;
  86 }
  87
  88 static int bool_value(char *s)
  89 {
  90         char *ptr = s;
  91         while(*ptr) {
  92                 *ptr = tolower(*ptr);
  93                 ++ptr;
  94         }
  95
  96         return strcmp(s, "true") == 0 || strcmp(s, "yes") == 0 || strcmp(s, "1") == 0;
  97 }
  98
  99 int load_config(const char *fname)
 100 {
 101         FILE *fp;
 102         char buf[256];
 103         int nline = 0;
 104
 105         if(!(fp = fopen(fname, "rb"))) {
 106                 return 0;       /* just ignore missing config files */
 107         }
 108
 109         while(fgets(buf, sizeof buf, fp)) {
 110                 char *line, *key, *value;
 111
 112                 ++nline;
 113                 if(!(line = strip_space(buf))) {
 114                         continue;
 115                 }
 116
 117                 if(!(value = strchr(line, '='))) {
 118                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 119                         return -1;
 120                 }
 121                 *value++ = 0;
 122
 123                 if(!(key = strip_space(line)) || !(value = strip_space(value))) {
 124                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 125                         return -1;
 126                 }
 127
 128                 if(strcmp(line, "music") == 0) {
 129                         opt.music = bool_value(value);
 130                 } else if(strcmp(line, "screen") == 0) {
 131                         opt.start_scr = strdup(value);
 132                 } else if(strcmp(line, "sball") == 0) {
 133                         opt.sball = bool_value(value);
 134                 } else if(strcmp(line, "vsync") == 0) {
 135                         opt.vsync = bool_value(value);
 136                 } else if(strcmp(line, "debug") == 0) {
 137                         opt.dbginfo = bool_value(value);
 138                 } else {
 139                         fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line);
 140                         return -1;
 141                 }
 142         }
 143         return 0;
 144 }