#![cfg(unix)]
use std::env;
use std::path::PathBuf;
use std::mem;
use std::ptr;
use std::ffi::CStr;
use std::ffi::OsString;
use std::os::unix::ffi::OsStringExt;
extern crate libc;
pub fn home_dir() -> Option<PathBuf> {
return env::var_os("HOME").and_then(|h| { if h.is_empty() { None } else { Some(h) } } ).or_else(|| unsafe {
fallback()
}).map(PathBuf::from);
#[cfg(any(target_os = "android",
target_os = "ios",
target_os = "emscripten"))]
unsafe fn fallback() -> Option<OsString> { None }
#[cfg(not(any(target_os = "android",
target_os = "ios",
target_os = "emscripten")))]
unsafe fn fallback() -> Option<OsString> {
let amt = match libc::sysconf(libc::_SC_GETPW_R_SIZE_MAX) {
n if n < 0 => 512 as usize,
n => n as usize,
};
let mut buf = Vec::with_capacity(amt);
let mut passwd: libc::passwd = mem::zeroed();
let mut result = ptr::null_mut();
match libc::getpwuid_r(libc::getuid(), &mut passwd, buf.as_mut_ptr(),
buf.capacity(), &mut result) {
0 if !result.is_null() => {
let ptr = passwd.pw_dir as *const _;
let bytes = CStr::from_ptr(ptr).to_bytes();
if bytes.is_empty() {
None
} else {
Some(OsStringExt::from_vec(bytes.to_vec()))
}
},
_ => None,
}
}
}