Memory error during variable parameter overload

If the following 2 Three forms of overloading

unsigned format(char* szBuf, unsigned nBufLen,const char* fmt...);
unsigned format(char* szBuf, unsigned nBufLen,const char* fmt, va_list arglist);

If it contains only one character pointer , Then the above overload will always call the latter , This will cause runtime memory errors , The program crashed directly .

The reason for the mistake is :

typedef char *  va_list;

If the calling code uses character pointers instead of va_list type , This will result in runtime memory errors .

Therefore, the above overload must be adjusted .