diff --git a/fex2bin.c b/fex2bin.c
index 8f8b392..7fea847 100644
--- a/fex2bin.c
+++ b/fex2bin.c
@@ -223,75 +223,3 @@ parse_error:
 		ok = 0;
 	return ok;
 }
-
-/**
- */
-int main(int argc, char *argv[])
-{
-	int ret = 1;
-	FILE *in = stdin;
-	int out = 1;
-	const char *fn[] = {"stdin", "stdout"};
-	struct script *script;
-
-	if (argc>1) {
-		if (strcmp(argv[1],"-") == 0)
-			; /* we are using stdin anyway */
-		else if ((fn[0] = argv[1]) &&
-			 (in = fopen(fn[0], "r")) == NULL) {
-			errf("%s: %s\n", fn[0], strerror(errno));
-			goto usage;
-		}
-
-		if (argc>2) {
-			fn[1] = argv[2];
-
-			if ((out = open(fn[1], O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) {
-				errf("%s: %s\n", fn[1], strerror(errno));
-				goto usage;
-			}
-		}
-	}
-
-	if ((script = script_new()) == NULL) {
-		errf("malloc: %s\n", strerror(errno));
-		goto done;
-	}
-
-	if (parse_fex(in, fn[0], script)) {
-		size_t sections, entries, bin_size;
-		void *bin;
-
-		bin_size = calculate_bin_size(script, &sections, &entries);
-		bin = calloc(1, bin_size);
-		if (!bin)
-			perror("malloc");
-		else if (generate_bin(bin, bin_size, script, sections, entries)) {
-
-			while(bin_size) {
-				ssize_t wc = write(out, bin, bin_size);
-
-				if (wc>0) {
-					bin += wc;
-					bin_size -= wc;
-				} else if (wc < 0 && errno != EINTR) {
-					pr_err("%s: write: %s\n", fn[2],
-					       strerror(errno));
-					break;
-				}
-			}
-			if (bin_size == 0)
-				ret = 0;
-		}
-	}
-
-	script_delete(script);
-	goto done;
-usage:
-	errf("Usage: %s [<script.fex> [<script.bin>]]\n", argv[0]);
-
-done:
-	if (in && in != stdin) fclose(in);
-	if (out > 2) close(out);
-	return ret;
-}
diff --git a/fexc.c b/fexc.c
index dd478b1..66b1dab 100644
--- a/fexc.c
+++ b/fexc.c
@@ -17,25 +17,113 @@
 
 #include "fexc.h"
 
+#include <errno.h>
 #include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <fcntl.h>
+
+#define pr_info(...)	errf("fexc: " __VA_ARGS__)
+#define pr_err(...)	pr_info("E: " __VA_ARGS__)
+
+enum script_format {
+	FEX_SCRIPT_FORMAT,
+	BIN_SCRIPT_FORMAT,
+};
 
 /*
  */
-static int script_parse(int UNUSED(mode), const char *UNUSED(filename),
-			struct script *UNUSED(script))
+static int script_parse_fex(FILE *UNUSED(in), const char *UNUSED(filename),
+			    struct script *UNUSED(script))
 {
 	return 0;
 }
-static int script_generate(int UNUSED(mode), const char *UNUSED(filename),
-			   struct script *UNUSED(script))
+
+static size_t script_bin_size(struct script *UNUSED(script),
+			      size_t *UNUSED(sections),
+			      size_t *UNUSED(entries))
 {
 	return 0;
 }
 
+static int script_generate_bin(void *UNUSED(bin), size_t UNUSED(bin_size),
+			       struct script *UNUSED(script),
+			       size_t UNUSED(sections),
+			       size_t UNUSED(entries))
+{
+	return 0;
+}
+
+/*
+ */
+static inline int script_parse(enum script_format format,
+			       const char *filename,
+			       struct script *script)
+{
+	int ret = 0;
+	switch (format) {
+	case FEX_SCRIPT_FORMAT: {
+		FILE *in = stdin;
+		if (filename && (in = fopen(filename, "r")) == NULL) {
+			errf("%s: %s\n", filename, strerror(errno));
+			break;
+		}
+		ret = script_parse_fex(in, filename ? filename : "<stdin>",
+				       script);
+		fclose(in);
+		}; break;
+	case BIN_SCRIPT_FORMAT: {
+		}; break;
+	}
+	return ret;
+}
+static inline int script_generate(enum script_format format,
+				  const char *filename,
+				  struct script *script)
+{
+	int ret = 0;
+	switch (format) {
+	case FEX_SCRIPT_FORMAT: {
+		}; break;
+	case BIN_SCRIPT_FORMAT: {
+		int out = 1; /* stdout */
+		size_t sections, entries, bin_size;
+		void *bin;
+
+		if (!filename)
+			filename = "<stdout>";
+		else if ((out = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) {
+			errf("%s: %s\n", filename, strerror(errno));
+			break;
+		}
+
+		bin_size = script_bin_size(script, &sections, &entries);
+		bin = calloc(1, bin_size);
+		if (!bin)
+			perror("malloc");
+		else if (script_generate_bin(bin, bin_size, script, sections, entries)) {
+			while(bin_size) {
+				ssize_t wc = write(out, bin, bin_size);
+
+				if (wc>0) {
+					bin += wc;
+					bin_size -= wc;
+				} else if (wc < 0 && errno != EINTR) {
+					pr_err("%s: write: %s\n", filename,
+					       strerror(errno));
+					break;
+				}
+			}
+			if (bin_size == 0)
+				ret = 0;
+		}
+		}; break;
+	}
+	return ret;
+}
+
 /*
  */
 static inline void app_usage(const char *arg0, int mode)
@@ -65,8 +153,9 @@ static inline int app_choose_mode(char *arg0)
 int main(int argc, char *argv[])
 {
 	static const char *formats[] = { "fex", "bin", NULL };
-	int infmt=0, outfmt=1;
-	const char *filename[] = { "stdin", "stdout" };
+	enum script_format infmt=FEX_SCRIPT_FORMAT;
+	enum script_format outfmt=BIN_SCRIPT_FORMAT;
+	const char *filename[] = { NULL /*stdin*/, NULL /*stdout*/};
 	struct script *script;
 
 	int app_mode = app_choose_mode(argv[0]);