谁知道scanf函数是怎么写的？

int __cdecl scanf ( const char *format, ... ) /* * stdin 'SCAN', 'F'ormatted */ { int retval;

va_list arglist;

va_start(arglist, format);

_ASSERTE(format != NULL);

_lock_str2(0, stdin);

retval = (_input(stdin,format,arglist));

_unlock_str2(0, stdin);

return(retval); }