Add libc dependency in libcc2rs

Author: lucic71

libcc2rs/Cargo.toml

@@ -5,3 +5,4 @@ edition = "2024"
 
 [dependencies]
 libcc2rs-macros = { path = "../libcc2rs-macros", version = "0.1.0" }
+libc = "0.2"

libcc2rs/src/alloc.rs

@@ -1,47 +1,37 @@
 // Copyright (c) 2022-present INESC-ID.
 // Distributed under the MIT license that can be found in the LICENSE file.
 
-use std::ffi::{c_char, c_void};
-
-unsafe extern "C" {
-    fn malloc(size: usize) -> *mut c_void;
-    fn free(ptr: *mut c_void);
-    fn realloc(ptr: *mut c_void, size: usize) -> *mut c_void;
-    fn calloc(nmemb: usize, size: usize) -> *mut c_void;
-    fn strdup(s: *const c_char) -> *mut c_char;
-}
-
 /// # Safety
 ///
 /// Same contract as C's `malloc`.
-pub unsafe fn malloc_unsafe(a0: u64) -> *mut c_void {
-    unsafe { malloc(a0 as usize) }
+pub unsafe fn malloc_unsafe(a0: u64) -> *mut libc::c_void {
+    unsafe { libc::malloc(a0 as libc::size_t) }
 }
 
 /// # Safety
 ///
 /// Same contract as C's `free`.
-pub unsafe fn free_unsafe(a0: *mut c_void) {
-    unsafe { free(a0) }
+pub unsafe fn free_unsafe(a0: *mut libc::c_void) {
+    unsafe { libc::free(a0) }
 }
 
 /// # Safety
 ///
 /// Same contract as C's `realloc`.
-pub unsafe fn realloc_unsafe(a0: *mut c_void, a1: u64) -> *mut c_void {
-    unsafe { realloc(a0, a1 as usize) }
+pub unsafe fn realloc_unsafe(a0: *mut libc::c_void, a1: u64) -> *mut libc::c_void {
+    unsafe { libc::realloc(a0, a1 as libc::size_t) }
 }
 
 /// # Safety
 ///
 /// Same contract as C's `calloc`.
-pub unsafe fn calloc_unsafe(a0: u64, a1: u64) -> *mut c_void {
-    unsafe { calloc(a0 as usize, a1 as usize) }
+pub unsafe fn calloc_unsafe(a0: u64, a1: u64) -> *mut libc::c_void {
+    unsafe { libc::calloc(a0 as libc::size_t, a1 as libc::size_t) }
 }
 
 /// # Safety
 ///
 /// Same contract as C's `strdup`.
 pub unsafe fn strdup_unsafe(a0: *const u8) -> *mut u8 {
-    unsafe { strdup(a0 as *const c_char) as *mut u8 }
+    unsafe { libc::strdup(a0 as *const libc::c_char) as *mut u8 }
 }