it compiles

.gitignore

@@ -0,0 +1 @@
+efn

c_quit.c

@@ -0,0 +1,4 @@
+void
+c_quit() {
+	exit(0);
+}

commands.c

@@ -0,0 +1,3 @@
+void (*commands[256])() = {
+NULL,
+['q'] = c_quit,

compile.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+gcc efn.c -o efn

consts.h

@@ -0,0 +1 @@
+#define ROW_SIZE 100

efn.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+#include "consts.h"
+
+#include "types.h"
+
+#include "efn.h"
+
+#include "main.c"
+
+#include "commands.c"
+};
+
+#include "c_quit.c"
+

efn.h

@@ -0,0 +1,4 @@
+extern void (*commands[256])();
+
+void c_quit();
+

main.c

@@ -0,0 +1,11 @@
+int
+main(int argc, char **argv) {
+	static char buf[256];
+	while (1) {
+		char *com = fgets(buf, sizeof(buf), stdin);
+		if (com != NULL) {
+			commands[com[0]]();
+		}
+	}
+	return 0;
+}

types.h

@@ -0,0 +1,2 @@
+typedef struct Row Row;
+struct Row {Row *p; Row *n; char text[ROW_SIZE]; int line;};