- added config file and commandline parsing

[dosdemo] / src / cfgopt.c

diff --git a/src/cfgopt.c b/src/cfgopt.c
new file mode 100644 (file)
index 0000000..553a145
--- /dev/null
+++ b/src/cfgopt.c
@@ -0,0 +1,108 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include "cfgopt.h"
+
+struct options opt;
+
+int parse_args(int argc, char **argv)
+{
+       int i;
+       char *scrname = 0;
+
+       for(i=1; i<argc; i++) {
+               if(argv[i][0] == '-') {
+                       if(strcmp(argv[i], "-music") == 0) {
+                               opt.music = 1;
+                       } else if(strcmp(argv[i], "-nomusic") == 0) {
+                               opt.music = 0;
+                       } else if(strcmp(argv[i], "-scr") == 0 || strcmp(argv[i], "-screen") == 0) {
+                               scrname = argv[++i];
+                       } else {
+                               fprintf(stderr, "invalid option: %s\n", argv[i]);
+                               return -1;
+                       }
+               } else {
+                       if(scrname) {
+                               fprintf(stderr, "unexpected option: %s\n", argv[i]);
+                               return -1;
+                       }
+                       scrname = argv[i];
+               }
+       }
+
+       opt.start_scr = scrname;
+       return 0;
+}
+
+static char *strip_space(char *s)
+{
+       int len;
+       char *end;
+
+       while(*s && isspace(*s)) ++s;
+       if(!*s) return 0;
+
+       if((end = strrchr(s, '#'))) {
+               --end;
+       } else {
+               len = strlen(s);
+               end = s + len - 1;
+       }
+
+       while(end > s && isspace(*end)) *end-- = 0;
+       return end > s ? s : 0;
+}
+
+static int bool_value(char *s)
+{
+       char *ptr = s;
+       while(*ptr) {
+               *ptr = tolower(*ptr);
+               ++ptr;
+       }
+
+       return strcmp(s, "true") == 0 || strcmp(s, "yes") == 0 || strcmp(s, "1") == 0;
+}
+
+int load_config(const char *fname)
+{
+       FILE *fp;
+       char buf[256];
+       int nline = 0;
+
+       if(!(fp = fopen(fname, "rb"))) {
+               return 0;       /* just ignore missing config files */
+       }
+
+       while(fgets(buf, sizeof buf, fp)) {
+               char *line, *key, *value;
+
+               ++nline;
+               if(!(line = strip_space(buf))) {
+                       continue;
+               }
+
+               if(!(value = strchr(line, '='))) {
+                       fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
+                       return -1;
+               }
+               *value++ = 0;
+
+               if(!(key = strip_space(line)) || !(value = strip_space(value))) {
+                       fprintf(stderr, "%s:%d invalid key/value pair\n", fname, nline);
+                       return -1;
+               }
+
+               if(strcmp(line, "music") == 0) {
+                       opt.music = bool_value(value);
+               } else if(strcmp(line, "screen") == 0) {
+                       opt.start_scr = strdup(value);
+               } else {
+                       fprintf(stderr, "%s:%d invalid option: %s\n", fname, nline, line);
+                       return -1;
+               }
+       }
+       return 0;
+}