From 0383fff94471278c92ef2ad5edc14abbb40a9acd Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Fri, 16 Dec 2022 18:54:55 -0800
Subject: [PATCH] Enable 64bit off_t

Ensure that off_t is always 64-bit by specifying -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 this will ensure that normal lseek() function is
same as lseek64

This helps compiling on latest musl where lseek64 and friends are not
available

Upstream-status: Submitted [https://github.com/Gregwar/fatcat/pull/34]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 CMakeLists.txt         | 2 ++
 src/core/FatSystem.cpp | 4 ++--
 src/core/FatSystem.h   | 2 --
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6a2649..4cdd1fb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,8 @@ IF(DEFINE_WIN)
 	add_definitions(-D__WIN__)
 ENDIF(DEFINE_WIN)
 
+add_definitions(-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64)
+
 include_directories("${CMAKE_SOURCE_DIR}/src")
 
 add_executable(fatcat "src/fatcat.cpp" ${ALL_SOURCES})
diff --git a/src/core/FatSystem.cpp b/src/core/FatSystem.cpp
index 79cda8c..1f52e82 100644
--- a/src/core/FatSystem.cpp
+++ b/src/core/FatSystem.cpp
@@ -90,7 +90,7 @@ int FatSystem::readData(unsigned long long address, char *buffer, int size)
         cerr << "! Trying to read outside the disk" << endl;
     }
 
-    lseek64(fd, globalOffset+address, SEEK_SET);
+    lseek(fd, globalOffset+address, SEEK_SET);
 
     int n;
     int pos = 0;
@@ -112,7 +112,7 @@ int FatSystem::writeData(unsigned long long address, const char *buffer, int siz
         throw string("Trying to write data while write mode is disabled");
     }
 
-    lseek64(fd, globalOffset+address, SEEK_SET);
+    lseek(fd, globalOffset+address, SEEK_SET);
 
     int n;
     int pos = 0;
diff --git a/src/core/FatSystem.h b/src/core/FatSystem.h
index cd3c914..f9f2ca3 100644
--- a/src/core/FatSystem.h
+++ b/src/core/FatSystem.h
@@ -11,11 +11,9 @@
 
 #ifdef __APPLE__
 #define O_LARGEFILE 0
-#define lseek64 lseek
 #endif
 #ifdef __WIN__
 #define O_LARGEFILE 0
-#define lseek64 lseek
 #endif
 using namespace std;