C标准库源代码,能提高对C的理解,不错的哦

				// cwctype standard header
				
				#if     _MSC_VER > 1000 /*IFSTRIP=IGN*/
				#pragma once
				#endif
				
				#ifndef _CWCTYPE_
				#define _CWCTYPE_
				#ifdef _STD_USING
				 #undef _STD_USING
				 #include 
				 #define _STD_USING
				#else
				 #include 
				#endif /* _STD_USING */
				#endif /* _CWCTYPE_ */
				
				/*
				 * Copyright (c) 1994 by P.J. Plauger.  ALL RIGHTS RESERVED. 
				 * Consult your license regarding permissions and restrictions.
				 */