From 6b6ed3db97fb3f612c6015cbaa2439cc78097abc Mon Sep 17 00:00:00 2001
From: richinseattle <richinseattle@gmail.com>
Date: Sun, 30 Jul 2023 00:03:38 -0700
Subject: [PATCH] update mmap.c to use ssize_t instead of off_t for 64bit

---
 win.c | 14 ++++++--------
 win.h |  2 +-
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/win.c b/win.c
index cba8c0c..723f5d5 100644
--- a/win.c
+++ b/win.c
@@ -2,7 +2,6 @@
 #include <errno.h>
 #include <io.h>
 
-
 #ifndef FILE_MAP_EXECUTE
 #define FILE_MAP_EXECUTE    0x0020
 #endif /* FILE_MAP_EXECUTE */
@@ -53,10 +52,9 @@ static DWORD __map_mmap_prot_file(const int prot)
     return desiredAccess;
 }
 
-void* mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
+void* mmap(void *addr, size_t len, int prot, int flags, int fildes, ssize_t off)
 {
     HANDLE fm, h;
-    
     void * map = MAP_FAILED;
     
 #ifdef _MSC_VER
@@ -64,18 +62,18 @@ void* mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
 #pragma warning(disable: 4293)
 #endif
 
-    const DWORD dwFileOffsetLow = (sizeof(off_t) <= sizeof(DWORD)) ? 
+    const DWORD dwFileOffsetLow = (sizeof(ssize_t) <= sizeof(DWORD)) ? 
                     (DWORD)off : (DWORD)(off & 0xFFFFFFFFL);
-    const DWORD dwFileOffsetHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
+    const DWORD dwFileOffsetHigh = (sizeof(ssize_t) <= sizeof(DWORD)) ?
                     (DWORD)0 : (DWORD)((off >> 32) & 0xFFFFFFFFL);
     const DWORD protect = __map_mmap_prot_page(prot);
     const DWORD desiredAccess = __map_mmap_prot_file(prot);
 
-    const off_t maxSize = off + (off_t)len;
+    const ssize_t maxSize = off + (ssize_t)len;
 
-    const DWORD dwMaxSizeLow = (sizeof(off_t) <= sizeof(DWORD)) ? 
+    const DWORD dwMaxSizeLow = (sizeof(ssize_t) <= sizeof(DWORD)) ? 
                     (DWORD)maxSize : (DWORD)(maxSize & 0xFFFFFFFFL);
-    const DWORD dwMaxSizeHigh = (sizeof(off_t) <= sizeof(DWORD)) ?
+    const DWORD dwMaxSizeHigh = (sizeof(ssize_t) <= sizeof(DWORD)) ?
                     (DWORD)0 : (DWORD)((maxSize >> 32) & 0xFFFFFFFFL);
 
 #ifdef _MSC_VER
diff --git a/win.h b/win.h
index c15ee06..7647854 100644
--- a/win.h
+++ b/win.h
@@ -53,7 +53,7 @@ extern "C" {
 /* Flags for portable clock_gettime call. */
 #define CLOCK_REALTIME  0
 
-void*   mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off);
+void*   mmap(void *addr, size_t len, int prot, int flags, int fildes, ssize_t off);
 int     munmap(void *addr, size_t len);
 int     mprotect(void *addr, size_t len, int prot);
 int     msync(void *addr, size_t len, int flags);