sw: allow wrtd_get_attr_string to return the necessary size even when the buffer itself is NULL

ff8df1d4 · Dimitris Lampridis · Dimitris Lampridis · ae10cd4d · ff8df1d4
Commit ff8df1d4 authored Jun 21, 2019 by Dimitris Lampridis Committed by Dimitris Lampridis Jun 26, 2019
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libwrtd.c software/lib/libwrtd.c +1 -1

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--- a/software/lib/libwrtd.c
+++ b/software/lib/libwrtd.c
@@ -687,7 +687,7 @@ wrtd_status wrtd_get_attr_string(wrtd_dev *wrtd,
        status = wrtd_validate_id(wrtd, rep_cap_id, __func__);
        WRTD_RETURN_IF_ERROR(status);

-        if(value == NULL){
+        if ((value_buffer_size != 0) && (value == NULL)) {
                return wrtd_return_error
                        (wrtd, WRTD_ERROR_NULL_POINTER,
                         "Null pointer passed for function %s, "