From 12fdf46cb916b71ed8360250d50b9208684695c9 Mon Sep 17 00:00:00 2001
From: Alex Kiernan <alex.kiernan@gmail.com>
Date: Sun, 19 Jan 2020 16:03:21 +0000
Subject: [PATCH 1/2] Use unistd.h not argp.h for all POSIX systems

getopt(3) is found in unistd.h on all POSIX systems and we make no use
of any of the GNU specific argp extensions. Include unistd.h directly to
allow building with musl on linux, whilst retaining compatibility with
glibc and other unices.

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
---
 src/fatcat.cpp | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/src/fatcat.cpp b/src/fatcat.cpp
index ce23ca0..b4427e4 100644
--- a/src/fatcat.cpp
+++ b/src/fatcat.cpp
@@ -1,14 +1,10 @@
 #include <stdlib.h>
-#include<string.h>
-#ifdef __APPLE__
-#include <unistd.h>
-#else
+#include <string.h>
 #ifdef __WIN__
 #include <ctype.h>
 #include "xgetopt/xgetopt.h"
 #else
-#include <argp.h>
-#endif
+#include <unistd.h>
 #endif
 
 #include <stdio.h>

From 29021747ac2e52a27013310a532439bfdf438c24 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 2/2] 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

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;