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use core::mem::{self, MaybeUninit};
use core::ptr;
use core::slice;
use std::alloc::{self as rust, Layout};
const HEADER: usize = mem::size_of::<usize>();
const MALLOC_ALIGN: usize = mem::align_of::<usize>();
pub unsafe fn malloc(size: u64) -> *mut core::ffi::c_void {
let size = HEADER + size as usize;
let layout = Layout::from_size_align_unchecked(size, MALLOC_ALIGN);
let memory = rust::alloc(layout);
if memory.is_null() {
rust::handle_alloc_error(layout);
}
memory.cast::<usize>().write(size);
let result = memory.add(HEADER).cast();
result
}
pub unsafe fn calloc(n: u64, size: u64) -> *mut core::ffi::c_void {
let mem = malloc(n * size);
ptr::write_bytes(mem, 0, (n * size) as usize);
mem
}
pub unsafe fn realloc(ptr: *mut core::ffi::c_void, new_size: u64) -> *mut core::ffi::c_void {
if ptr.is_null() {
return calloc(1, new_size);
}
let mut memory = ptr.cast::<u8>().sub(HEADER);
let size = memory.cast::<usize>().read();
let layout = Layout::from_size_align_unchecked(size, MALLOC_ALIGN);
let new_size = HEADER + new_size as usize;
memory = rust::realloc(memory, layout, new_size);
if memory.is_null() {
let layout = Layout::from_size_align_unchecked(new_size, MALLOC_ALIGN);
rust::handle_alloc_error(layout);
}
memory.cast::<usize>().write(new_size);
memory.add(HEADER).cast()
}
pub unsafe fn free(ptr: *mut core::ffi::c_void) {
if ptr == ptr::null_mut() {
return;
}
let memory = ptr.cast::<u8>().sub(HEADER);
let size = memory.cast::<usize>().read();
let layout = Layout::from_size_align_unchecked(size, MALLOC_ALIGN);
rust::dealloc(memory, layout);
}
pub unsafe fn memcmp(
lhs: *const core::ffi::c_void,
rhs: *const core::ffi::c_void,
count: u64,
) -> i32 {
let lhs = slice::from_raw_parts(lhs.cast::<u8>(), count as usize);
let rhs = slice::from_raw_parts(rhs.cast::<u8>(), count as usize);
lhs.cmp(rhs) as i32
}
pub unsafe fn memcpy(
dest: *mut core::ffi::c_void,
src: *const core::ffi::c_void,
count: u64,
) -> *mut core::ffi::c_void {
ptr::copy_nonoverlapping(
src.cast::<MaybeUninit<u8>>(),
dest.cast::<MaybeUninit<u8>>(),
count as usize,
);
dest
}
pub unsafe fn memmove(
dest: *mut core::ffi::c_void,
src: *const core::ffi::c_void,
count: u64,
) -> *mut core::ffi::c_void {
ptr::copy(
src.cast::<MaybeUninit<u8>>(),
dest.cast::<MaybeUninit<u8>>(),
count as usize,
);
dest
}
pub unsafe fn memset(dest: *mut core::ffi::c_void, ch: i32, count: u64) -> *mut core::ffi::c_void {
ptr::write_bytes(dest.cast::<u8>(), ch as u8, count as usize);
dest
}
pub unsafe fn strcmp(lhs: *const i8, rhs: *const i8) -> i32 {
let lhs = slice::from_raw_parts(lhs.cast::<u8>(), strlen(lhs) as usize);
let rhs = slice::from_raw_parts(rhs.cast::<u8>(), strlen(rhs) as usize);
lhs.cmp(rhs) as i32
}
pub unsafe fn strdup(src: *const i8) -> *mut i8 {
let len = strlen(src);
let dest = malloc(len + 1);
memcpy(dest, src.cast(), len + 1);
dest.cast()
}
pub unsafe fn strlen(str: *const i8) -> u64 {
let mut end = str;
while *end != 0 {
end = end.add(1);
}
end.offset_from(str) as u64
}
pub unsafe fn strncmp(lhs: *const i8, rhs: *const i8, mut count: u64) -> i32 {
let mut lhs = lhs.cast::<u8>();
let mut rhs = rhs.cast::<u8>();
while count > 0 && *lhs != 0 && *lhs == *rhs {
lhs = lhs.add(1);
rhs = rhs.add(1);
count -= 1;
}
if count == 0 {
0
} else {
(*lhs).cmp(&*rhs) as i32
}
}