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