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// Copyright 2016 Alex Regueiro
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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use libc::{self, c_char, c_void};
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use std::ffi::CStr;
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pub fn error_message(ptr: *const c_char) -> String {
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let cstr = unsafe { CStr::from_ptr(ptr as *const _) };
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let s = String::from_utf8_lossy(cstr.to_bytes()).into();
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unsafe {
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libc::free(ptr as *mut c_void);
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}
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s
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}
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macro_rules! ffi_try {
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( $($function:ident)::*( $( $arg:expr ),* ) ) => ({
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let mut err: *mut ::libc::c_char = ::std::ptr::null_mut();
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let result = $($function)::*($($arg),*, &mut err);
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if !err.is_null() {
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return Err(Error::new($crate::ffi_util::error_message(err)));
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}
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result
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})
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}
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