b4n commented on this pull request.
> + return lcs;
+}
+
+
+/** Transform file names in a list to be shorter.
+ *
+ * This function takes a list of file names (probably with absolute paths), and
+ * transforms the paths such that they are short but still unique. This is
intended
+ * for dialogs which present the file list to the user, where the base name
may result
+ * in duplicates (showing the full path might be inappropriate).
+ *
+ * The algorthm strips the common prefix (e-g. the user's home directory) and
+ * replaces the longest common substring with an ellipsis ("...").
+ *
+ * @param file_names @array{length=num} The list of strings to process.
+ * @param num The number of strings contained in @a file_names. Can be 0 if
it's terminated by @c NULL.
IMO it should not be an error if you allow a non-`NULL`-terminated array,
because as you said yourself, allocating a 0-length array will give you a
`NULL` pointer -- which is fine as you shouldn't be accessing anything past its
0th element.
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