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

fpdfsdk/src/fsdk_baseannot.cpp

Index: fpdfsdk/src/fsdk_baseannot.cpp
diff --git a/fpdfsdk/src/fsdk_baseannot.cpp b/fpdfsdk/src/fsdk_baseannot.cpp
index 52f34fae8eb125cca33c13fec613711727c0e117..1ccac9275af6b2ed8f30521ed77183b9dd1bf24b 100644
--- a/fpdfsdk/src/fsdk_baseannot.cpp
+++ b/fpdfsdk/src/fsdk_baseannot.cpp
@@ -4,6 +4,7 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
+#include "../../core/include/fxcrt/fx_ext.h"
 #include "../include/fsdk_define.h"
 #include "../include/fsdk_mgr.h"
 #include "../include/fsdk_baseannot.h"
@@ -216,12 +217,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     int i = 0;
     int j, k;
     FX_CHAR ch;
-    while (i < strLength) {
-      ch = dtStr[i];
-      if (ch >= '0' && ch <= '9')
-        break;
-      i++;
-    }
+    while (i < strLength && !std::isdigit(dtStr[i]))
+      ++i;
+
     if (i >= strLength)
       return *this;
 
@@ -229,9 +227,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 4) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }
@@ -243,9 +241,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 2) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }
@@ -257,9 +255,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 2) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }
@@ -271,9 +269,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 2) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }
@@ -285,9 +283,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 2) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }
@@ -299,9 +297,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 2) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }
@@ -320,9 +318,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 2) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }
@@ -337,9 +335,9 @@ CPDFSDK_DateTime& CPDFSDK_DateTime::FromPDFDateTimeString(
     k = 0;
     while (i < strLength && j < 2) {
       ch = dtStr[i];
-      k = k * 10 + ch - '0';
+      k = k * 10 + FXSYS_toDecimalDigit(ch);
       j++;
-      if (ch < '0' || ch > '9')
+      if (!std::isdigit(ch))
         break;
       i++;
     }