Add libvboxfs: VirtualBox shared folders library

lib/libvboxfs/path.c

@@ -0,0 +1,60 @@
+/* Part of libvboxfs - (c) 2012, D.C. van Moolenbroek */
+
+#include "inc.h"
+
+/*
+ * Store a local path name in the given path object, performing any necessary
+ * conversions.  The path object is expected to be used read-only, so the size
+ * of the path object is set as small as possible.  If 'name' is NULL, the path
+ * will be initialized to the empty string.
+ */
+int
+vboxfs_set_path(vboxfs_path_t *path, char *name)
+{
+	size_t len;
+
+	len = strlen(name);
+
+	/* FIXME: missing UTF-8 conversion */
+
+	if (len >= sizeof(path->data))
+		return ENAMETOOLONG;
+
+	strcpy(path->data, name);
+
+	path->len = len;
+	path->size = len + 1;
+
+	return OK;
+}
+
+/*
+ * Retrieve the path name from the given path object.  Make sure the name fits
+ * in the given name buffer first.  The given size must include room for a
+ * terminating null character.
+ */
+int
+vboxfs_get_path(vboxfs_path_t *path, char *name, size_t size)
+{
+
+	/* FIXME: missing UTF-8 conversion */
+
+	if (path->len >= size)
+		return ENAMETOOLONG;
+
+	assert(path->data[path->len] == 0);
+
+	strcpy(name, path->data);
+
+	return OK;
+}
+
+/*
+ * Return the byte size of a previously initialized path object.
+ */
+size_t
+vboxfs_get_path_size(vboxfs_path_t *path)
+{
+
+	return offsetof(vboxfs_path_t, data) + path->size;
+}