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