MTK中的字符串拷贝函数，宽字节，主要用于unicode编码格式的字串拷贝，用法和strcpy相同，MTK中的kal_wstrcmp、kal_wstrcat等函数也是这样
文件：kal_release.h
typedef unsigned short WCHAR;
// 16bits string operationsint kal_wstrlen(const WCHAR *wstr);
WCHAR *kal_wstrcpy(WCHAR *to, const WCHAR *from);
WCHAR *kal_wstrncpy(WCHAR *to, const WCHAR *from, int n);
int kal_wstrcmp(const WCHAR *s1, const WCHAR *s2);
int kal_wstrncmp(const WCHAR *s1, const WCHAR *s2, int n);
WCHAR *kal_wstrcat(WCHAR *s1, const WCHAR *s2);
WCHAR *kal_wstrncat(WCHAR *s1, const WCHAR *s2, int n);
WCHAR *kal_wstrchr(const WCHAR *s, int c);
WCHAR *kal_wstrrchr(const WCHAR *str, int ch);
// dual 8bits string operationsint kal_dchar_strlen(const char *wstr);
char *kal_dchar_strcpy(char *to, const char *from);
char *kal_dchar_strncpy(char *to, const char *from, int n);
int kal_dchar_strcmp(const char *s1, const char *s2);
int kal_dchar_strncmp(const char *s1, const char *s2, int n);
char *kal_dchar_strcat(char *s1, const char *s2);
char *kal_dchar_strncat(char *s1, const char *s2, int n);
char *kal_dchar_strchr(const char *s, int c);
char *kal_dchar_strrchr(const char *str, int ch);
void kal_dchar2char(WCHAR *outstr, char* tostr);
void kal_wsprintf(WCHAR *outstr, char *fmt,...);
#define kal_toWCHAR(asciiString) L##asciiString
在MTK平台进行宽字符串的处理，可以用这些KAL层（Kernel Abstraction Layer， 适配层）封转的处理函数，更为重要的是，KAL封装了一系列API，这些API为其他软件提供服务，例如队列、消息、timer、内存管理等，通过适配层的封装，增强了程序移植性、测试和调试的功能，并使代码更容易集成。
