1 files changed, 47 insertions, 0 deletions
diff --git a/src/til_args.c b/src/til_args.c
new file mode 100644
index 0000000..ae1346c
--- /dev/null
+++ b/src/til_args.c
@@ -0,0 +1,47 @@
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#include "til_args.h"
+
+/*
+ * ./rototiller --video=drm,dev=/dev/dri/card3,connector=VGA-1,mode=640x480@60
+ * ./rototiller --video=sdl,size=640x480
+ * ./rototiller --module=roto,foo=bar,module=settings
+ * ./rototiller --defaults
+ */
+int til_args_parse(int argc, const char *argv[], til_args_t *res_args)
+{
+	assert(argc > 0);
+	assert(argv);
+	assert(res_args);
+
+	/* this is intentionally being kept very simple, no new dependencies like getopt. */
+
+	for (int i = 1; i < argc; i++) {
+		if (!strncmp("--video=", argv[i], 8)) {
+			res_args->video = &argv[i][8];
+		} else if (!strncmp("--module=", argv[i], 9)) {
+			res_args->module = &argv[i][9];
+		} else if (!strcmp("--defaults", argv[i])) {
+			res_args->use_defaults = 1;
+		} else if (!strcmp("--help", argv[i])) {
+			res_args->help = 1;
+		} else {
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+
+int til_args_help(FILE *out)
+{
+	return fprintf(out,
+		"  --defaults	use defaults for unspecified settings\n"
+		"  --help	this help\n"
+		"  --module=	module settings\n"
+		"  --video=	video settings\n"
+		);
+}