diff --git a/cameo/Makefile b/cameo/Makefile
index e9b05c3..532a4cf 100644
--- a/cameo/Makefile
+++ b/cameo/Makefile
@@ -15,7 +15,7 @@ PREFIX ?= /usr/local
 SHELL=/bin/bash
 
 MAIN=cameo
-OBJS=cameo.o gerber.o gnuplot.o path.o lex.yy.o y.tab.o
+OBJS=cameo.o gerber.o gnuplot.o ops.o path.o lex.yy.o y.tab.o
 
 CFLAGS_WARN=-Wall -Wshadow -Wmissing-prototypes \
             -Wmissing-declarations -Wno-format-zero-length
diff --git a/cameo/cameo.c b/cameo/cameo.c
index 8ab0699..001ff7c 100644
--- a/cameo/cameo.c
+++ b/cameo/cameo.c
@@ -16,50 +16,11 @@
 #include <unistd.h>
 
 #include "path.h"
+#include "ops.h"
 #include "gnuplot.h"
 #include "gerber.h"
 
 
-static void process_path(struct path *path, int inside, int dog_bone)
-{
-	int left;
-	struct path *new;
-
-	left = path_tool_is_left(path);
-	if (inside)
-		new = path_offset(path, !left, path->notch);
-	else
-		new = path_offset(path, left, path->notch || dog_bone);
-	path_replace(path, new);
-}
-
-
-static void process_paths(struct path *paths, int dog_bone)
-{
-	struct path *leftmost, *path;
-
-	/*
-	 * We don't have an algorithm (yet) that can detect which paths are
-	 * inside other paths. Therefore, we fake it by looking for the path
-	 * that contains lowest x coordinate. This ought to be the outer
-	 * boundary of the piece.
-	 *
-	 * Note that this heuristic falls apart when a job consists of
-	 * multiple pieces. In this case, the #%outside hint can be used to
-	 * explicitly tell cameo to treat the path as an outside edge.
-	 */
-
-	leftmost = path_find_leftmost(paths);
-	for (path = paths; path; path = path->next)
-		if (path != leftmost && !path->outside)
-			process_path(path, 1, dog_bone);
-	for (path = paths; path; path = path->next)
-		if (path != leftmost && path->outside)
-			process_path(path, 0, dog_bone);
-	process_path(leftmost, 0, dog_bone);
-}
-
-
 static void usage(const char *name)
 {
 	fprintf(stderr,
@@ -110,7 +71,7 @@ int main(int argc, char **argv)
 		paths = gerber_read(in, r);
 	else
 		paths = gnuplot_read(in, r);
-	process_paths(paths, dog_bone);
+	tool_comp_paths(paths, dog_bone);
 	gnuplot_write(out, paths);
 
 	return 0;
diff --git a/cameo/ops.c b/cameo/ops.c
new file mode 100644
index 0000000..733b130
--- /dev/null
+++ b/cameo/ops.c
@@ -0,0 +1,55 @@
+/*
+ * ops.c - Higher-level toolpath operations
+ *
+ * Written 2010 by Werner Almesberger
+ * Copyright 2010 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#include "path.h"
+#include "ops.h"
+
+
+static void tool_comp_1(struct path *path, int inside, int dog_bone)
+{
+	int left;
+	struct path *new;
+
+	left = path_tool_is_left(path);
+	if (inside)
+		new = path_offset(path, !left, path->notch);
+	else
+		new = path_offset(path, left, path->notch || dog_bone);
+	path_replace(path, new);
+}
+
+
+void tool_comp_paths(struct path *paths, int dog_bone)
+{
+	struct path *leftmost, *path;
+
+	/*
+	 * We don't have an algorithm (yet) that can detect which paths are
+	 * inside other paths. Therefore, we fake it by looking for the path
+	 * that contains lowest x coordinate. This ought to be the outer
+	 * boundary of the piece.
+	 *
+	 * Note that this heuristic falls apart when a job consists of
+	 * multiple pieces. In this case, the #%outside hint can be used to
+	 * explicitly tell cameo to treat the path as an outside edge.
+	 */
+
+	leftmost = path_find_leftmost(paths);
+	for (path = paths; path; path = path->next)
+		if (path != leftmost && !path->outside)
+			tool_comp_1(path, 1, dog_bone);
+	for (path = paths; path; path = path->next)
+		if (path != leftmost && path->outside)
+			tool_comp_1(path, 0, dog_bone);
+	tool_comp_1(leftmost, 0, dog_bone);
+}
diff --git a/cameo/ops.h b/cameo/ops.h
new file mode 100644
index 0000000..50d6646
--- /dev/null
+++ b/cameo/ops.h
@@ -0,0 +1,23 @@
+/*
+ * ops.h - Higher-level toolpath operations
+ *
+ * Written 2010 by Werner Almesberger
+ * Copyright 2010 Werner Almesberger
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+#ifndef OPS_H
+#define OPS_H
+
+
+#include "path.h"
+
+
+void tool_comp_paths(struct path *paths, int dog_bone);
+
+#endif /* !OPS_H */