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// This file is part of Hexchat Plugin API Bindings for Rust
// Copyright (C) 2018, 2021 Soni L.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use crate::EMPTY_CSTRING_DATA;
use crate::cstr;
use std::mem;
use std::ffi::CString;
/// Holds name, desc, vers
// This is kinda naughty - we modify these values after returning from hexchat_plugin_init, during
// the deinitialization.
// However, if my reading of the HexChat code is correct, this is "ok".
#[derive(Copy, Clone)]
pub struct PluginInfo {
pub name: *mut *const libc::c_char,
pub desc: *mut *const libc::c_char,
pub vers: *mut *const libc::c_char,
}
impl PluginInfo {
/// Creates a PluginInfo.
///
/// # Safety
///
/// This function is unsafe, as it can't guarantee the validity of its arguments. It does more
/// checking than `new_unchecked` however.
///
/// # Panics
///
/// This function explicitly doesn't panic. Call unwrap() on the result instead.
pub unsafe fn new(name: *mut *const libc::c_char, desc: *mut *const libc::c_char, vers: *mut *const libc::c_char) -> Option<PluginInfo> {
if name.is_null() || desc.is_null() || vers.is_null() || name == desc || desc == vers || name == vers {
None
} else {
Some(PluginInfo::new_unchecked(name, desc, vers))
}
}
/// Creates a PluginInfo without checking the arguments.
///
/// # Safety
///
/// This function is unsafe, as it doesn't check the validity of the arguments. You're expected
/// to only pass in non-aliased non-null pointers. Use new if unsure.
pub unsafe fn new_unchecked(name: *mut *const libc::c_char, desc: *mut *const libc::c_char, vers: *mut *const libc::c_char) -> PluginInfo {
PluginInfo {
name, desc, vers
}
}
/// Drop relevant CStrings.
///
/// # Safety
///
/// This function is unsafe because calling it may trigger Undefined Behaviour. See also
/// [CString::from_raw].
///
/// [from_raw]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.from_raw
pub unsafe fn drop_info(&mut self) {
if !(*self.name).is_null() {
mem::drop(CString::from_raw(*self.name as *mut _));
*self.name = cstr(EMPTY_CSTRING_DATA);
}
if !(*self.desc).is_null() {
mem::drop(CString::from_raw(*self.desc as *mut _));
*self.desc = cstr(EMPTY_CSTRING_DATA);
}
if !(*self.vers).is_null() {
mem::drop(CString::from_raw(*self.vers as *mut _));
*self.vers = cstr(EMPTY_CSTRING_DATA);
}
}
}
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