On Sun, 3 Sep 2006, Ola Lundqvist wrote:
I tried to implement a getpass function myself but I got into a number
of problems, like: surpressing character echoing, getc seem not to return
until newline is pressed and so on... I have tried fread and many other
ways but without success.
I have had a look at getpass in glibc, and it seems to suffer somewhat
from relying on the internals of glibc, although a brief inspection
suggests that it is possible to extract working POSIX code.
However, I'm more attracted by the following code, which I found in the
glibc info documentation:
#include <termios.h>
#include <stdio.h>
ssize_t
my_getpass (char **lineptr, size_t *n, FILE *stream)
{
struct termios old, new;
int nread;
/* Turn echoing off and fail if we can't. */
if (tcgetattr (fileno (stream), &old) != 0)
return -1;
new = old;
new.c_lflag &= ~ECHO;
if (tcsetattr (fileno (stream), TCSAFLUSH, &new) != 0)
return -1;
/* Read the password. */
nread = getline (lineptr, n, stream);
/* Restore terminal. */
(void) tcsetattr (fileno (stream), TCSAFLUSH, &old);
return nread;
}
How does that look?
BTW, this brings up one vexed point: the info docs are under the GFDL,
not the GPL. I'll check that the code examples are (as the GFDL itself
suggests) under a suitable license; I can't find anything in the docs
themselves, so I'm posting to glibc-bugs.
--
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