Replace most uses of pointer::offset with add and sub

WaffleLapkin · WaffleLapkin · commit bd1ab724064f · 2022-08-21T02:21:41.000+04:00
diff --git a/example/alloc_system.rs b/example/alloc_system.rs
@@ -94,7 +94,7 @@ mod platform {
     struct Header(*mut u8);
     const HEAP_ZERO_MEMORY: DWORD = 0x00000008;
     unsafe fn get_header<'a>(ptr: *mut u8) -> &'a mut Header {
-        &mut *(ptr as *mut Header).offset(-1)
+        &mut *(ptr as *mut Header).sub(1)
     }
     unsafe fn align_ptr(ptr: *mut u8, align: usize) -> *mut u8 {
         let aligned = ptr.add(align - (ptr as usize & (align - 1)));

Original file line number	Diff line number	Diff line change
`@@ -94,7 +94,7 @@ mod platform {`
`94`	`94`	`struct Header(*mut u8);`
`95`	`95`	`const HEAP_ZERO_MEMORY: DWORD = 0x00000008;`
`96`	`96`	`unsafe fn get_header<'a>(ptr: *mut u8) -> &'a mut Header {`
`97`		`- &mut (ptr as mut Header).offset(-1)`
	`97`	`+ &mut (ptr as mut Header).sub(1)`
`98`	`98`	`}`
`99`	`99`	`unsafe fn align_ptr(ptr: mut u8, align: usize) -> mut u8 {`
`100`	`100`	`let aligned = ptr.add(align - (ptr as usize & (align - 1)));`