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//! Assorted utility functions. // This file is part of the PulseAudio Rust language binding. // // Copyright (c) 2017 Lyndon Brown // // This library 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 // 2.1 of the License, or (at your option) any later version. // // This library 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 this library; // if not, see <http://www.gnu.org/licenses/>. use capi; use std::ffi::CStr; macro_rules! fn_string_with_buffer { ( $fn_name:ident, $fn_call:ident ) => { pub fn $fn_name(l: usize) -> Option<String> { let mut tmp = Vec::with_capacity(l); unsafe { // Need to check NULL return here because `get_binary_name` function is not // supported on all architectures and so may return NULL, and might as well check // NULL return for other uses anyway. let ptr = capi::$fn_call(tmp.as_mut_ptr(), l); match ptr.is_null() { true => None, false => Some(CStr::from_ptr(tmp.as_mut_ptr()).to_string_lossy().into_owned()), } } } }; } /// Return the current username. Returns `None` on failure. fn_string_with_buffer!(get_user_name, pa_get_user_name); /// Return the current hostname. Returns `None` on failure. fn_string_with_buffer!(get_host_name, pa_get_host_name); /// Return the fully qualified domain name. Returns `None` on failure. fn_string_with_buffer!(get_fqdn, pa_get_fqdn); /// Return the home directory of the current user. Returns `None` on failure. fn_string_with_buffer!(get_home_dir, pa_get_home_dir); /// Return the binary file name of the current process. Returns `None` on failure. This is not /// supported on all architectures (in which case `NULL` is returned). fn_string_with_buffer!(get_binary_name, pa_get_binary_name);