1 files changed, 39 insertions, 0 deletions
diff --git a/src/cli.c b/src/cli.c
new file mode 100644
index 0000000..a54bf5d
--- /dev/null
+++ b/src/cli.c
@@ -0,0 +1,39 @@
+struct CliArgs {
+    const char* input_filename;
+    const char* output_filename;
+    BOOL output_executable;
+};
+typedef struct CliArgs CliArgs;
+
+CliArgs* parse_cli_args(int argc, char** argv) {
+    const char* output_filename = NULL;
+    int positional_arguments_start = -1;
+
+    for (int i = 1; i < argc; ++i) {
+        if (argv[i][0] != '-') {
+            positional_arguments_start = i;
+            break;
+        }
+        char c = argv[i][1];
+        if (c == 'g') {
+            // ignore
+        } else if (c == 'O') {
+            // ignore
+        } else if (c == 'o') {
+            if (argc <= i + 1) {
+                fatal_error("-o requires filename");
+            }
+            output_filename = argv[i + 1];
+            ++i;
+        }
+    }
+    if (positional_arguments_start == -1) {
+        fatal_error("usage: ducc <file>");
+    }
+
+    CliArgs* a = calloc(1, sizeof(CliArgs));
+    a->input_filename = argv[positional_arguments_start];
+    a->output_filename = output_filename;
+    a->output_executable = output_filename && !str_ends_with(output_filename, ".s");
+    return a;
+}