// Pushes back ("ungets") one character to be read next by _getwch() or
// _getwche(). On success, returns the character that was pushed back; on
// failure, returns EOF.
extern "C" int __cdecl _ungetch(int const c)
{
__acrt_lock(__acrt_conio_lock);
int result = 0;
__try
{
result = _ungetch_nolock(c);
}
__finally
{
__acrt_unlock(__acrt_conio_lock);
}
return result;
}
int __cdecl _ungetch (
int c
)
{
int retval;
_mlock(_CONIO_LOCK); /* lock the console */
__TRY
retval = _ungetch_nolock(c); /* pushback character */
__FINALLY
_munlock(_CONIO_LOCK); /* unlock the console */
__END_TRY_FINALLY
return retval;
}