3 files changed, 9 insertions, 9 deletions
diff --git a/fpdfsdk/include/fsdk_annothandler.h b/fpdfsdk/include/fsdk_annothandler.h
index a9c76e2523..b36fe372b2 100644
--- a/fpdfsdk/include/fsdk_annothandler.h
+++ b/fpdfsdk/include/fsdk_annothandler.h
@@ -142,7 +142,7 @@ class IPDFSDK_AnnotHandler {
 class CPDFSDK_BFAnnotHandler : public IPDFSDK_AnnotHandler {
  public:
   explicit CPDFSDK_BFAnnotHandler(CPDFDoc_Environment* pApp)
-      : m_pApp(pApp), m_pFormFiller(NULL) {}
+      : m_pApp(pApp), m_pFormFiller(nullptr) {}
   ~CPDFSDK_BFAnnotHandler() override {}
 
   // IPDFSDK_AnnotHandler
@@ -255,7 +255,7 @@ class CPDFSDK_XFAAnnotHandler : public IPDFSDK_AnnotHandler {
   virtual FX_BOOL CanAnswer(CPDFSDK_Annot* pAnnot);
 
   virtual CPDFSDK_Annot* NewAnnot(CPDF_Annot* pAnnot, CPDFSDK_PageView* pPage) {
-    return NULL;
+    return nullptr;
   }
 
   virtual CPDFSDK_Annot* NewAnnot(CXFA_FFWidget* pAnnot,
diff --git a/fpdfsdk/include/fsdk_baseform.h b/fpdfsdk/include/fsdk_baseform.h
index 5e00e16402..c7a7e742d3 100644
--- a/fpdfsdk/include/fsdk_baseform.h
+++ b/fpdfsdk/include/fsdk_baseform.h
@@ -281,7 +281,7 @@ class CPDFSDK_InterForm : public IPDF_FormNotify {
   FX_BOOL OnKeyStrokeCommit(CPDF_FormField* pFormField,
                             const CFX_WideString& csValue);
   FX_BOOL OnValidate(CPDF_FormField* pFormField, const CFX_WideString& csValue);
-  void OnCalculate(CPDF_FormField* pFormField = NULL);
+  void OnCalculate(CPDF_FormField* pFormField = nullptr);
   CFX_WideString OnFormat(CPDF_FormField* pFormField, FX_BOOL& bFormated);
 
   void ResetFieldAppearance(CPDF_FormField* pFormField,
diff --git a/fpdfsdk/include/fsdk_mgr.h b/fpdfsdk/include/fsdk_mgr.h
index a47f230c92..bf11a23765 100644
--- a/fpdfsdk/include/fsdk_mgr.h
+++ b/fpdfsdk/include/fsdk_mgr.h
@@ -111,13 +111,13 @@ class CPDFDoc_Environment final {
   FPDF_PAGE FFI_GetPage(FPDF_DOCUMENT document, int nPageIndex) {
     if (m_pInfo && m_pInfo->FFI_GetPage)
       return m_pInfo->FFI_GetPage(m_pInfo, document, nPageIndex);
-    return NULL;
+    return nullptr;
   }
 
   FPDF_PAGE FFI_GetCurrentPage(FPDF_DOCUMENT document) {
     if (m_pInfo && m_pInfo->FFI_GetCurrentPage)
       return m_pInfo->FFI_GetCurrentPage(m_pInfo, document);
-    return NULL;
+    return nullptr;
   }
 
   int FFI_GetRotation(FPDF_PAGE page) {
@@ -181,7 +181,7 @@ class CPDFDoc_Environment final {
 
   CFX_WideString FFI_GetPlatform() {
     if (m_pInfo && m_pInfo->FFI_GetPlatform) {
-      int nRequiredLen = m_pInfo->FFI_GetPlatform(m_pInfo, NULL, 0);
+      int nRequiredLen = m_pInfo->FFI_GetPlatform(m_pInfo, nullptr, 0);
       if (nRequiredLen <= 0)
         return L"";
 
@@ -275,7 +275,7 @@ class CPDFDoc_Environment final {
                                  const char* mode) {
     if (m_pInfo && m_pInfo->FFI_OpenFile)
       return m_pInfo->FFI_OpenFile(m_pInfo, fileType, wsURL, mode);
-    return NULL;
+    return nullptr;
   }
 
   CFX_WideString FFI_GetFilePath(FPDF_FILEHANDLER* pFileHandler) const {
@@ -296,7 +296,7 @@ class CPDFDoc_Environment final {
 
       return new CFPDF_FileStream(fileHandler);
     }
-    return NULL;
+    return nullptr;
   }
 
   CFX_WideString FFI_PostRequestURL(const FX_WCHAR* wsURL,
@@ -361,7 +361,7 @@ class CPDFDoc_Environment final {
 
   CFX_WideString FFI_GetLanguage() {
     if (m_pInfo && m_pInfo->FFI_GetLanguage) {
-      int nRequiredLen = m_pInfo->FFI_GetLanguage(m_pInfo, NULL, 0);
+      int nRequiredLen = m_pInfo->FFI_GetLanguage(m_pInfo, nullptr, 0);
       if (nRequiredLen <= 0)
         return L"";