Add original unix v6

source/s2/mknod.c

@@ -0,0 +1,42 @@
+main(argc, argv)
+int argc;
+char **argv;
+{
+	int m, a, b;
+
+	if(argc != 5) {
+		printf("arg count\n");
+		goto usage;
+	}
+	if(*argv[2] == 'b')
+		m = 0160666; else
+	if(*argv[2] == 'c')
+		m = 0120666; else
+		goto usage;
+	a = number(argv[3]);
+	if(a < 0)
+		goto usage;
+	b = number(argv[4]);
+	if(b < 0)
+		goto usage;
+	if(mknod(argv[1], m, (a<<8)|b) < 0)
+		perror("mknod");
+	exit();
+
+usage:
+	printf("usage: mknod name b/c major minor\n");
+}
+
+number(s)
+char *s;
+{
+	int n, c;
+
+	n = 0;
+	while(c = *s++) {
+		if(c<'0' || c>'9')
+			return(-1);
+		n = n*10 + c-'0';
+	}
+	return(n);
+}