You need to prompt an interactive user for a password.
On Unix systems, you can use the standard C runtime function
getpass( ) if you can accept limiting passwords to
_PASSWORD_LEN, which is typically defined to be
128 characters. If you want to read longer passwords, you can use the
function described in the following
On Windows, you can use the standard
ES_PASSWORD specified as a style flag to mask
the characters typed by a user.
In the following subsections we’ll look at several different approaches to prompting for passwords.
The standard C runtime function
is the most portable way to obtain a password
from a user interactively. Unfortunately, it does have several
limitations that you may find unacceptable. The first is that only up
_PASSWORD_LEN (typically 128) characters may be
entered; any characters after that are simply discarded. The second
is that the password is stored in a statically defined buffer, so it
is not thread-safe, but ordinarily this is not much of a problem
because there is fundamentally no way to read from the terminal in a
thread-safe manner anyway.
getpass( ) function has the following
#include <sys/types.h> #include <unistd.h> char *getpass(const char *prompt);
The text passed as the function’s only argument is displayed on the terminal, terminal echo is disabled, and input ...