From 7fd0ca217c0e905897a3c3f67ac20f6b51287c48 Mon Sep 17 00:00:00 2001
From: boyu0 <yubo@cocos2d-x.org>
Date: Mon, 14 Jul 2014 20:42:08 +0800
Subject: [PATCH] Implement utils::atof()

---
 cocos/base/ccUtils.cpp | 24 ++++++++++++++++++++++++
 cocos/base/ccUtils.h   |  5 +++++
 2 files changed, 29 insertions(+)

diff --git a/cocos/base/ccUtils.cpp b/cocos/base/ccUtils.cpp
index 5a025b25ec..36cafb1c20 100644
--- a/cocos/base/ccUtils.cpp
+++ b/cocos/base/ccUtils.cpp
@@ -24,6 +24,9 @@ THE SOFTWARE.
 ****************************************************************************/
 
 #include "base/ccUtils.h"
+
+#include <stdlib.h>
+
 #include "base/CCDirector.h"
 #include "renderer/CCCustomCommand.h"
 #include "renderer/CCRenderer.h"
@@ -160,6 +163,27 @@ std::vector<Node*> findChildren(const Node &node, const std::string &name)
 
     return vec;
 }
+
+#define MAX_ITOA_BUFFER_SIZE 256
+double atof(const char* str)
+{
+    if (str == nullptr)
+    {
+        return 0.0;
+    }
+    
+    char buf[MAX_ITOA_BUFFER_SIZE];
+    strncpy(buf, str, MAX_ITOA_BUFFER_SIZE);
+    
+    // strip string, only remain 7 numbers after '.'
+    char* dot = strchr(buf, '.');
+    if (dot != nullptr && dot - buf + 8 <  MAX_ITOA_BUFFER_SIZE)
+    {
+        dot[8] = '\0';
+    }
+    
+    return ::atof(buf);
+}
     
 }
 
diff --git a/cocos/base/ccUtils.h b/cocos/base/ccUtils.h
index 939d71b854..1fba5b1b40 100644
--- a/cocos/base/ccUtils.h
+++ b/cocos/base/ccUtils.h
@@ -73,6 +73,11 @@ namespace utils
      * @since v3.2
      */
     std::vector<Node*> findChildren(const Node &node, const std::string &name);
+    
+    /** Same to ::atof, but strip the string, remain 7 numbers after '.' before call atof。
+     *  Why we need this? Because in android c++_static, atof ( and std::atof ) is unsupported for numbers have long decimal part and contain several numbers can approximate to 1 （ like 90.099998474121094 ), it will return inf. this function is used to fix this bug.
+     */
+    double atof(const char* str);
 }
 
 NS_CC_END