Create basic REPL module

lib/repl.c

@@ -0,0 +1,30 @@
+#include "repl.h"
+
+#include <stdio.h>
+
+void init_repl(repl_t *repl)
+{
+	init_memory_pool(&repl->pool);
+}
+
+void step_repl(repl_t *repl)
+{
+	int len;
+	for (len = 0; len < REPL_LINE_BUFFER_SIZE; ++len) {
+		const int byte = repl->get_byte();
+		if ('\n' == byte)
+			break;
+		repl->line_buffer[len] = (char)byte;
+	}
+	const expression_t *e = repl->read(&repl->pool, repl->line_buffer, len);
+	const int result = repl->evaluate(e);
+	const int result_len = snprintf(
+	    repl->result_buffer, REPL_RESULT_BUFFER_SIZE, "%d\n", result);
+	repl->print(repl->result_buffer, result_len);
+}
+
+void run_repl(repl_t *repl)
+{
+	while (1)
+		step_repl(repl);
+}