getpass.c
2.39 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Library Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with GNU Mailutils; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <termios.h>
/* Alain: Parts originally from GNU Lib C. */
static void
echo_off(int fd, struct termios *stored_settings)
{
struct termios new_settings;
tcgetattr (fd, stored_settings);
new_settings = *stored_settings;
new_settings.c_lflag &= (~ECHO);
tcsetattr (fd, TCSANOW, &new_settings);
}
static void
echo_on(int fd, struct termios *stored_settings)
{
tcsetattr (fd, TCSANOW, stored_settings);
}
char *
getpass (const char * prompt)
{
FILE *in, *out;
struct termios stored_settings;
static char *buf;
static size_t buf_size;
char *pbuf;
/* First pass initialize the buffer. */
if (buf_size == 0)
{
buf_size = 256;
buf = calloc (1, buf_size);
if (buf == NULL)
return NULL;
}
else
memset (buf, '\0', buf_size);
/* Turn echoing off if it is on now. */
echo_off (fileno (stdin), &stored_settings);
/* Write the prompt. */
fputs (prompt, stdout);
fflush (stdout);
/* Read the password. */
pbuf = fgets (buf, buf_size, stdin);
if (pbuf)
{
size_t nread = strlen (pbuf);
if (nread && pbuf[nread - 1] == '\n')
{
/* Remove the newline. */
pbuf[nread - 1] = '\0';
/* Write the newline that was not echoed. */
putc ('\n', stdout);
}
}
/* Restore the original setting. */
echo_on (fileno (stdin), &stored_settings);
return pbuf;
}
#ifdef _GETPASS_STANDALONE_TEST
int
main ()
{
char *p;
p = getpass ("my prompt: ");
if (p)
printf ("Passwd: %s\n", p);
return 0;
}
#endif