<p>In <a href="https://github.com/geany/geany-plugins/pull/324#discussion_r49270798">lineoperations/src/linefunctions.c</a>:</p>
<pre style='color:#555'>> + *
> + *      You should have received a copy of the GNU General Public License along
> + *      with this program; if not, write to the Free Software Foundation, Inc.,
> + *      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> +*/
> +
> +
> +#include "linefunctions.h"
> +
> +
> +// isspace()
> +gboolean issp(gchar c)
> +{
> +  return (c == ' ' || c == '\t' || c == '\f' ||
> +                  c == '\v' || c == '\r' || c == '\n');
> +}
</pre>
<p><a href="https://developer.gnome.org/glib/unstable/glib-String-Utility-Functions.html#g-ascii-isspace"><code>g_ascii_isspace()</code></a></p>

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