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#[cfg(not(feature = "std"))]
use core::alloc::{GlobalAlloc, Layout};

#[cfg(not(feature = "std"))]
use crate::libc;

pub struct Allocator;

#[cfg(not(feature = "std"))]
unsafe impl GlobalAlloc for Allocator {
    #[inline]
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        libc::malloc(layout.size()) as *mut u8
    }

    #[inline]
    unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
        libc::calloc(layout.size(), 1) as *mut u8
    }

    #[inline]
    unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
        libc::free(ptr as *mut libc::c_void)
    }

    #[inline]
    unsafe fn realloc(&self, ptr: *mut u8, _layout: Layout, new_size: usize) -> *mut u8 {
        libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8
    }
}

#[cfg(not(feature = "std"))]
#[alloc_error_handler]
fn _alloc_error(_layout: Layout) -> ! {
    panic!("Allocation error");
}