Revert "Revert "Revert "Revert "Cleanup some numeric code.""""

fpdfsdk/src/javascript/PublicMethods.cpp

Index: fpdfsdk/src/javascript/PublicMethods.cpp
diff --git a/fpdfsdk/src/javascript/PublicMethods.cpp b/fpdfsdk/src/javascript/PublicMethods.cpp
index e898214cd85d47ee827716955b4709c74b03e628..7ede42db13f6830b7988c822e9ac4e5d3caba19c 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;