Implement utils::atof()

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"
@@ -161,6 +164,27 @@ 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);
+}
+    
 }
 
 NS_CC_END

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