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use std::ffi::{ CStr, CString };
use std::path::Path;
use std::os::raw::{ c_char, c_void };
use libc;
use error::{ OpenError, OpenErrorKind };
include!(concat!(env!("OUT_DIR"), "/config.rs"));
macro_rules! x11_link {
{ $struct_name:ident, $pkg_name:ident, [$($lib_name:expr),*], $nsyms:expr,
$(pub fn $fn_name:ident ($($param_name:ident : $param_type:ty),*) -> $ret_type:ty,)*
variadic:
$(pub fn $vfn_name:ident ($($vparam_name: ident : $vparam_type:ty),+) -> $vret_type:ty,)*
globals:
$(pub static $var_name:ident : $var_type:ty,)*
} => {
pub struct $struct_name {
#[allow(dead_code)]
lib: ::link::DynamicLibrary,
$(pub $fn_name: unsafe extern "C" fn ($($param_type),*) -> $ret_type,)*
$(pub $vfn_name: unsafe extern "C" fn ($($vparam_type),+, ...) -> $vret_type,)*
$(pub $var_name: *mut $var_type,)*
}
unsafe impl Send for $struct_name {}
unsafe impl Sync for $struct_name {}
impl $struct_name {
unsafe fn init (this: *mut Self) -> Result<(), $crate::error::OpenError> {
lazy_static! {
static ref SYMS: [(&'static str, usize); $nsyms] = unsafe {[
$((stringify!($fn_name), &((*(0 as *const $struct_name)).$fn_name) as *const _ as usize),)*
$((stringify!($vfn_name), &((*(0 as *const $struct_name)).$vfn_name) as *const _ as usize),)*
$((stringify!($var_name), &((*(0 as *const $struct_name)).$var_name) as *const _ as usize),)*
]};
}
let offset = this as usize;
for &(name, sym_offset) in SYMS.iter() {
*((offset + sym_offset) as *mut *mut _) = try!((*this).lib.symbol(name));
}
Ok(())
}
pub fn open () -> Result<$struct_name, $crate::error::OpenError> {
unsafe {
let libdir = $crate::link::config::libdir::$pkg_name;
let lib = try!($crate::link::DynamicLibrary::open_multi(libdir, &[$($lib_name),*]));
let mut this: ::std::mem::ManuallyDrop<$struct_name>
= ::std::mem::uninitialized();
let this_ptr = &mut this as *mut _ as *mut $struct_name;
::std::ptr::write(&mut (*this_ptr).lib, lib);
try!(Self::init(this_ptr));
Ok(::std::mem::ManuallyDrop::into_inner(this))
}
}
}
};
}
pub struct DynamicLibrary {
handle: *mut c_void,
}
impl DynamicLibrary {
pub fn open (name: &str) -> Result<DynamicLibrary, OpenError> {
unsafe {
let cname = match CString::new(name) {
Ok(cname) => cname,
Err(_) => {
return Err(OpenError::new(OpenErrorKind::Library,
String::from("library name contains NUL byte(s)")));
},
};
let handle = libc::dlopen(cname.as_ptr(), libc::RTLD_LAZY);
if handle.is_null() {
let msg = libc::dlerror();
if msg.is_null() {
return Err(OpenError::new(OpenErrorKind::Library, String::new()));
}
let cmsg = CStr::from_ptr(msg as *const c_char);
let detail = cmsg.to_string_lossy().into_owned();
return Err(OpenError::new(OpenErrorKind::Library, detail));
}
Ok(DynamicLibrary { handle: handle as *mut c_void })
}
}
pub fn open_multi (libdir: Option<&'static str>, names: &[&str]) -> Result<DynamicLibrary, OpenError> {
assert!(!names.is_empty());
let paths = libdir.map_or(Vec::new(), |dir| {
let path = Path::new(dir);
names.iter().map(|name| path.join(name).to_str().unwrap().to_string()).collect::<Vec<_>>()
});
let mut msgs = Vec::new();
for name in names.iter().map(|x| *x).chain(paths.iter().map(|x| &**x)) {
match DynamicLibrary::open(name) {
Ok(lib) => { return Ok(lib); },
Err(err) => { msgs.push(format!("{}", err)); },
}
}
let mut detail = String::new();
for i in 0..msgs.len() {
if i != 0 {
detail.push_str("; ");
}
detail.push_str(msgs[i].as_ref());
}
Err(OpenError::new(OpenErrorKind::Library, detail))
}
pub fn symbol (&self, name: &str) -> Result<*mut c_void, OpenError> {
unsafe {
let cname = match CString::new(name) {
Ok(cname) => cname,
Err(_) => {
return Err(OpenError::new(OpenErrorKind::Symbol,
String::from("symbol name contains NUL byte(s)")));
},
};
let sym = libc::dlsym(self.handle as *mut _, cname.as_ptr());
if sym.is_null() {
let msg = libc::dlerror();
if msg.is_null() {
return Err(OpenError::new(OpenErrorKind::Symbol, String::from(name)));
}
let cmsg = CStr::from_ptr(msg as *const c_char);
let detail = format!("{} - {}", name, cmsg.to_string_lossy().into_owned());;
return Err(OpenError::new(OpenErrorKind::Symbol, detail));
}
Ok(sym as *mut c_void)
}
}
}
impl Drop for DynamicLibrary {
fn drop (&mut self) {
unsafe {
libc::dlclose(self.handle as *mut _);
}
}
}