73 lines
2.1 KiB
Rust
73 lines
2.1 KiB
Rust
// Copyright (C) 2023-2024 Free Software Foundation, Inc.
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//
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// This file is part of the GNU Proc Macro Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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use std::convert::TryInto;
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use std::ffi::c_uchar;
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use std::fmt;
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use std::slice::from_raw_parts;
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use std::str::from_utf8;
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extern "C" {
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fn FFIString__new(data: *const c_uchar, len: u64) -> FFIString;
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fn FFIString__drop(string: *mut FFIString);
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}
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#[repr(C)]
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#[derive(Debug)]
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pub struct FFIString {
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data: *const c_uchar,
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len: u64,
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}
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impl<S> From<S> for FFIString
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where
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S: AsRef<str>,
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{
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fn from(s: S) -> Self {
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unsafe { FFIString__new(s.as_ref().as_ptr(), s.as_ref().len() as u64) }
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}
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}
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impl Clone for FFIString {
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fn clone(&self) -> Self {
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FFIString::from(&self.to_string())
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}
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}
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impl Drop for FFIString {
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fn drop(&mut self) {
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unsafe {
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FFIString__drop(self as *mut FFIString);
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}
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}
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}
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impl fmt::Display for FFIString {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.write_str(
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from_utf8(unsafe {
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from_raw_parts(self.data, self.len.try_into().map_err(|_| fmt::Error)?)
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})
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.map_err(|_| fmt::Error)?,
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)
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}
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}
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