<p>In <a href="https://github.com/geany/geany/pull/1187#discussion_r76044794">src/tagmanager/tm_query.c</a>:</p>
<pre style='color:#555'>> +            g_slice_free(TMQuery, q);
> +  }
> +}
> +
> +
> +/** Add name filter to a query
> + *
> + * The query results will be restricted to tags matching the name. The
> + * matching is a simple prefix matching. The length to match can be
> + * limited to allow multiple tags to match a prefix.
> + *
> + * @param q The query to operate on.
> + * @param name The name to filter.
> + * @param name_len The number of characters to use (from the beginning).
> + *
> + * @return 0 on succcess, < 0 on error.
</pre>
<p>If you want it to be a nice API for non-C languages, go all the way and use a <code>GError</code>, that will be translated to a proper exception, contains a code and even a message.  Not saying it's really worth it, but it seems more like the canonical way of doing it in GLib-using stuff.</p>

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