From 24be37e59ba144a507bb53f07ca2673e0ed444b4 Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Fri, 8 Sep 2023 13:39:48 +0200
Subject: win32 fix ptr arith

---
 source/kit/allocator.c | 14 +++++++-------
 source/kit/allocator.h |  6 +++++-
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/source/kit/allocator.c b/source/kit/allocator.c
index f39c903..149cddb 100644
--- a/source/kit/allocator.c
+++ b/source/kit/allocator.c
@@ -43,10 +43,10 @@ static void *kit_allocate_default_(int request, ptrdiff_t size,
       if (size == previous_size)
         return pointer;
 
-      void *p = NULL;
+      uint8_t *p = NULL;
 
       if (size > 0) {
-        p = malloc(size);
+        p = (uint8_t *) malloc(size);
 
         if (p != NULL) {
           if (size > 0 && previous_size > 0)
@@ -106,7 +106,7 @@ static void *kit_allocate_from_buffer_(kit_allocator_t *alloc,
         return NULL;
 
       void *p = alloc->data;
-      alloc->data += size;
+      alloc->bytes += size;
       alloc->size -= size;
 
       if (request == KIT_ALLOCATE_ZERO)
@@ -130,10 +130,10 @@ static void *kit_allocate_from_buffer_(kit_allocator_t *alloc,
       if (previous_size != 0 && pointer == NULL)
         return NULL;
 
-      if (pointer + previous_size == alloc->data) {
+      if ((uint8_t *) pointer + previous_size == alloc->data) {
         if (alloc->size < size - previous_size)
           return NULL;
-        alloc->data += size - previous_size;
+        alloc->bytes += size - previous_size;
         alloc->size -= size - previous_size;
         return pointer;
       }
@@ -141,8 +141,8 @@ static void *kit_allocate_from_buffer_(kit_allocator_t *alloc,
       if (alloc->size < size)
         return NULL;
 
-      void *p = alloc->data;
-      alloc->data += size;
+      uint8_t *p = alloc->bytes;
+      alloc->bytes += size;
       alloc->size -= size;
 
       if (previous_size > 0)
diff --git a/source/kit/allocator.h b/source/kit/allocator.h
index 340883d..b344d4b 100644
--- a/source/kit/allocator.h
+++ b/source/kit/allocator.h
@@ -6,6 +6,7 @@
 #endif
 
 #include <stddef.h>
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -29,7 +30,10 @@ enum {
 typedef struct {
   int       type;
   ptrdiff_t size;
-  void     *data;
+  union {
+    uint8_t *bytes;
+    void    *data;
+  };
 } kit_allocator_t;
 
 //  Application should implement this function if custom allocator
-- 
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