2 files changed, 7 insertions, 5 deletions
diff --git a/fpdfsdk/src/javascript/PublicMethods.cpp b/fpdfsdk/src/javascript/PublicMethods.cpp
index e898214cd8..7ede42db13 100644
--- a/fpdfsdk/src/javascript/PublicMethods.cpp
+++ b/fpdfsdk/src/javascript/PublicMethods.cpp
@@ -6,6 +6,7 @@
 
 #include "PublicMethods.h"
 
+#include "../../../core/include/fxcrt/fx_ext.h"
 #include "../../include/fsdk_mgr.h"  // For CPDFDoc_Environment.
 #include "../../include/javascript/IJavaScript.h"
 #include "Field.h"
@@ -116,7 +117,7 @@ FX_BOOL CJS_PublicMethods::IsDigit(wchar_t ch) {
 }
 
 FX_BOOL CJS_PublicMethods::IsDigit(char ch) {
-  return (ch >= '0' && ch <= '9');
+  return std::isdigit(ch);
 }
 
 FX_BOOL CJS_PublicMethods::IsAlphabetic(wchar_t ch) {
@@ -396,7 +397,7 @@ int CJS_PublicMethods::ParseStringInteger(const CFX_WideString& string,
 
     FX_WCHAR c = string.GetAt(i);
     if (IsDigit((wchar_t)c)) {
-      nRet = nRet * 10 + (c - '0');
+      nRet = nRet * 10 + FXSYS_toDecimalDigit(c);
       nSkip = i - nStart + 1;
       if (nSkip >= nMaxStep)
         break;
diff --git a/fpdfsdk/src/javascript/util.cpp b/fpdfsdk/src/javascript/util.cpp
index 14e15c1b6f..fc94a0e393 100644
--- a/fpdfsdk/src/javascript/util.cpp
+++ b/fpdfsdk/src/javascript/util.cpp
@@ -6,6 +6,7 @@
 
 #include "util.h"
 
+#include "../../../core/include/fxcrt/fx_ext.h"
 #include "../../include/javascript/IJavaScript.h"
 #include "JS_Context.h"
 #include "JS_Define.h"
@@ -425,7 +426,7 @@ void util::printx(const std::string& cFormat,
         break;
       case 'X': {
         while (itSource < iSize) {
-          if ((cSource[itSource] >= '0' && cSource[itSource] <= '9') ||
+          if (std::isdigit(cSource[itSource]) ||
               (cSource[itSource] >= 'a' && cSource[itSource] <= 'z') ||
               (cSource[itSource] >= 'A' && cSource[itSource] <= 'Z')) {
             cPurpose += cSource[itSource];
@@ -450,7 +451,7 @@ void util::printx(const std::string& cFormat,
       } break;
       case '9': {
         while (itSource < iSize) {
-          if (cSource[itSource] >= '0' && cSource[itSource] <= '9') {
+          if (std::isdigit(cSource[itSource])) {
             cPurpose += cSource[itSource];
             itSource++;
             break;
@@ -531,7 +532,7 @@ int64_t FX_atoi64(const char* nptr) {
   total = 0;
 
   while (isdigit(c)) {
-    total = 10 * total + (c - '0');  /* accumulate digit */
+    total = 10 * total + FXSYS_toDecimalDigit(c); /* accumulate digit */
     c = (int)(unsigned char)*nptr++; /* get next char */
   }