OSSL_TRACE_CTRL_WRITE
case OSSL_TRACE_CTRL_WRITE:
if (buf == NULL || cnt == 0 || cmd != OSSL_TRACE_CTRL_WRITE || ctx == NULL)
size_t cnt = ctx->callback(buf, num, ctx->category, OSSL_TRACE_CTRL_WRITE,
case OSSL_TRACE_CTRL_WRITE: