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 struct options opt = {
   8         0,      /* start_scr */
   9         0,      /* music */
  10         0,      /* sball */
  11         1       /* vsync */
  12 };
  13
  14 int parse_args(int argc, char **argv)
  15 {
  16         int i;
  17         char *scrname = 0;
  18
  19         for(i=1; i<argc; i++) {
  20                 if(argv[i][0] == '-') {
  21                         if(strcmp(argv[i], "-music") == 0) {
  22                                 opt.music = 1;
  23                         } else if(strcmp(argv[i], "-nomusic") == 0) {
  24                                 opt.music = 0;
  25                         } else if(strcmp(argv[i], "-scr") == 0 || strcmp(argv[i], "-screen") == 0) {
  26                                 scrname = argv[++i];
  27                         } else if(strcmp(argv[i], "-sball") == 0) {
  28                                 opt.sball = !opt.sball;
  29                         } else if(strcmp(argv[i], "-vsync") == 0) {
  30                                 opt.vsync = 1;
  31                         } else if(strcmp(argv[i], "-novsync") == 0) {
  32                                 opt.vsync = 0;
  33                         } else {
  34                                 fprintf(stderr, "invalid option: %s\n", argv[i]);
  35                                 return -1;
  36                         }
  37                 } else {
  38                         if(scrname) {
  39                                 fprintf(stderr, "unexpected option: %s\n", argv[i]);
  40                                 return -1;
  41                         }
  42                         scrname = argv[i];
  43                 }
  44         }
  45
  46         if(scrname) {
  47                 opt.start_scr = scrname;
  48         }
  49         return 0;
  50 }
  51
  52 static char *strip_space(char *s)
  53 {
  54         int len;
  55         char *end;
  56
  57         while(*s && isspace(*s)) ++s;
  58         if(!*s) return 0;
  59
  60         if((end = strrchr(s, '#'))) {
  61                 --end;
  62         } else {
  63                 len = strlen(s);
  64                 end = s + len - 1;
  65         }
  66
  67         while(end > s && isspace(*end)) *end-- = 0;
  68         return end > s ? s : 0;
  69 }
  70
  71 static int bool_value(char *s)
  72 {
  73         char *ptr = s;
  74         while(*ptr) {
  75                 *ptr = tolower(*ptr);
  76                 ++ptr;
  77         }
  78
  79         return strcmp(s, "true") == 0 || strcmp(s, "yes") == 0 || strcmp(s, "1") == 0;
  80 }
  81
  82 int load_config(const char *fname)
  83 {
  84         FILE *fp;
  85         char buf[256];
  86         int nline = 0;
  87
  88         if(!(fp = fopen(fname, "rb"))) {
  89                 return 0;       /* just ignore missing config files */
  90         }
  91
  92         while(fgets(buf, sizeof buf, fp)) {
  93                 char *line, *key, *value;
  94
  95                 ++nline;
  96                 if(!(line = strip_space(buf))) {
  97                         continue;
  98                 }
  99
 100                 if(!(value = strchr(line, '='))) {
 101                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 102                         return -1;
 103                 }
 104                 *value++ = 0;
 105
 106                 if(!(key = strip_space(line)) || !(value = strip_space(value))) {
 107                         fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
 108                         return -1;
 109                 }
 110
 111                 if(strcmp(line, "music") == 0) {
 112                         opt.music = bool_value(value);
 113                 } else if(strcmp(line, "screen") == 0) {
 114                         opt.start_scr = strdup(value);
 115                 } else if(strcmp(line, "sball") == 0) {
 116                         opt.sball = bool_value(value);
 117                 } else if(strcmp(line, "vsync") == 0) {
 118                         opt.vsync = bool_value(value);
 119                 } else {
 120                         fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line);
 121                         return -1;
 122                 }
 123         }
 124         return 0;
 125 }