Implement the getfreemem primitive

lib/fs/getfreemem.c

@@ -0,0 +1,49 @@
+/* ****************************************************************************
+ * fs/getfreemem.c -- delete an element from a libcasio filesystem.
+ * Copyright (C) 2020 Alan "Lailouezzz" Le Bouder <alanlebouder@gmail.com>
+ *
+ * This file is part of libcasio.
+ * libcasio is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3.0 of the License,
+ * or (at your option) any later version.
+ *
+ * libcasio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libcasio; if not, see <http://www.gnu.org/licenses/>.
+ * ************************************************************************* */
+#include "fs.h"
+
+/**
+ *	casio_getfreemem:
+ *	Get the available free space on a fs.
+ *
+ *	@arg	fs		    the filesystem.
+ *	@arg	path	    the path.
+ *  @arg    capacity    the pointer to capacity.
+ *	@return			    the error code (0 if ok).
+ */
+
+int CASIO_EXPORT casio_getfreemem(casio_fs_t *fs, casio_path_t *path,
+		                    size_t *capacity)
+{
+	int err; void *nat;
+    casio_fs_getfreemem_t *getfreemem;
+
+    /* Get the function */
+    getfreemem = fs->casio_fs_funcs.casio_fsfuncs_getfreemem;
+    if(!getfreemem) return (casio_error_op);
+
+    /* Make the native path. */
+	err = casio_make_native_path(fs, &nat, path);
+	if (err) return (err);
+
+	/* Make the operation. */
+	err = (*getfreemem)(fs->casio_fs_cookie, nat, capacity);
+	casio_free_native_path(fs, nat);
+    return (err);
+}