From 28a5b1f0b339f1f0a5dde6ac04a5e5454b9be77c Mon Sep 17 00:00:00 2001
From: georgemoralis <giorgosmrls@gmail.com>
Date: Thu, 14 Mar 2024 17:59:26 +0200
Subject: [PATCH] added lseek in file_system

---
 .../hle/libraries/libkernel/file_system.cpp   | 24 +++++++++++++++++++
 .../hle/libraries/libkernel/file_system.h     |  1 +
 2 files changed, 25 insertions(+)

diff --git a/src/core/hle/libraries/libkernel/file_system.cpp b/src/core/hle/libraries/libkernel/file_system.cpp
index 6d4c61629..0046b9d5c 100644
--- a/src/core/hle/libraries/libkernel/file_system.cpp
+++ b/src/core/hle/libraries/libkernel/file_system.cpp
@@ -51,10 +51,34 @@ size_t PS4_SYSV_ABI _readv(int d, const SceKernelIovec* iov, int iovcnt) {
     return total_read;
 }
 
+s64 PS4_SYSV_ABI lseek(int d, s64 offset, int whence) {
+    auto* h = Common::Singleton<Core::FileSys::HandleTable>::Instance();
+    auto* file = h->GetFile(d);
+
+    file->m_mutex.lock();
+
+    if (whence == 1) {
+        offset = static_cast<int64_t>(file->f.Tell()) + offset;
+        whence = 0;
+    }
+
+    if (whence == 2) {
+        offset = static_cast<int64_t>(file->f.GetSize()) + offset;
+        whence = 0;
+    }
+
+    file->f.Seek(offset);
+    auto pos = static_cast<int64_t>(file->f.Tell());
+
+    file->m_mutex.unlock();
+    return pos;
+}
+
 void fileSystemSymbolsRegister(Loader::SymbolsResolver* sym) {
     LIB_FUNCTION("1G3lF1Gg1k8", "libkernel", 1, "libkernel", 1, 1, sceKernelOpen);
     LIB_FUNCTION("wuCroIGjt2g", "libScePosix", 1, "libkernel", 1, 1, posix_open);
     LIB_FUNCTION("+WRlkKjZvag", "libkernel", 1, "libkernel", 1, 1, _readv);
+    LIB_FUNCTION("Oy6IpwgtYOk", "libkernel", 1, "libkernel", 1, 1, lseek);
 
     // openOrbis (to check if it is valid out of OpenOrbis
     LIB_FUNCTION("6c3rCVE-fTU", "libkernel", 1, "libkernel", 1, 1,
diff --git a/src/core/hle/libraries/libkernel/file_system.h b/src/core/hle/libraries/libkernel/file_system.h
index a6319da51..6b3c88aa5 100644
--- a/src/core/hle/libraries/libkernel/file_system.h
+++ b/src/core/hle/libraries/libkernel/file_system.h
@@ -19,6 +19,7 @@ struct SceKernelIovec {
 int PS4_SYSV_ABI sceKernelOpen(const char* path, int flags, /* SceKernelMode*/ u16 mode);
 
 int PS4_SYSV_ABI posix_open(const char* path, int flags, /* SceKernelMode*/ u16 mode);
+s64 PS4_SYSV_ABI lseek(int d, s64 offset, int whence);
 
 void fileSystemSymbolsRegister(Loader::SymbolsResolver* sym);