Merge to XFA: Reland "Cleanup some numeric code.""

This reverts commit 0569ab0b11b723d9bca4ddd642b0cf8828c4bdd1.

This changes the various comparisons of char >= '0' && char <= '9' and
char < '0' || char > '9' to use std::isdigit checks. It also cleans up
a handful of hex to digit conversions to call one common method.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1449873003 .

(cherry picked from commit 3f148915d12f54a946a0c0bf526162b79c39d650)

Review URL: https://codereview.chromium.org/1452673002 .

1 files changed, 4 insertions, 3 deletions

diff --git a/fpdfsdk/src/javascript/util.cpp b/fpdfsdk/src/javascript/util.cpp
index c021ec9e95..30df53ea72 100644
--- a/fpdfsdk/src/javascript/util.cpp
+++ b/fpdfsdk/src/javascript/util.cpp
@@ -13,6 +13,7 @@
 #include "JS_Runtime.h"
 #include "JS_Value.h"
 #include "PublicMethods.h"
+#include "core/include/fxcrt/fx_ext.h"
 #include "fpdfsdk/include/javascript/IJavaScript.h"
 #include "resource.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 */
   }