001
07.07.2004, 16:03 Uhr
0xdeadbeef
Gott
(Operator)
|
Ich hab mir mal die getpass-Implementierug der glibc angekuckt und darauf aufbauend das hier gebastelt:
| C++: |
/* Copyright (C) 1992,93,94,95,96,97,98,99,2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdio.h>
#include <stdio_ext.h>
#include <termios.h>
#include <unistd.h>
/* It is desirable to use this bit on systems that have it.
The only bit of terminal state we want to twiddle is echoing, which is
done in software; there is no need to change the state of the terminal
hardware. */
#ifndef TCSASOFT
#define TCSASOFT 0
#endif
char *getnpass (char *buf, size_t bufsize, const char *prompt) {
FILE *in, *out;
struct termios s, t;
int tty_changed;
ssize_t nread, tmplen;
char *tmp;
/* Try to write to and read from the terminal if we can.
If we can't open the terminal, use stderr and stdin. */
in = fopen ("/dev/tty", "w+");
if (in == NULL) {
in = stdin;
out = stderr;
} else {
/* We do the locking ourselves. */
/* I know __-functions usually aren't meant for programmer
* use, but according to the information I found on the net,
* this (among other functions in the stdio_ext.h-Header)
* is meant for portable access to the stdio FILE structure.
*/
__fsetlocking (in, FSETLOCKING_BYCALLER);
out = in;
}
flockfile (out);
/* Turn echoing off if it is on now. */
if (tcgetattr (fileno (in), &t) == 0) {
/* Save the old one. */
s = t;
/* Tricky, tricky. */
t.c_lflag &= ~(ECHO|ISIG);
tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);
} else
tty_changed = 0;
#ifdef __USE_GNU
fputs_unlocked(prompt, out);
#else
fputs(prompt, out);
#endif
#ifdef __USE_MISC
fflush_unlocked(out);
#else
fflush(out);
#endif
/* Read the password. */
nread = getline (&tmp, &tmplen, in);
if (tmp != NULL) {
if (nread < 0)
tmp[0] = '\0';
else if (tmp[nread - 1] == '\n') {
/* Remove the newline. */
tmp[nread - 1] = '\0';
if (tty_changed) {
/* Write the newline that was not echoed. */
putc_unlocked('\n', out);
}
}
}
/* Restore the original setting. */
if (tty_changed)
(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
funlockfile (out);
if (in != stdin)
/* We opened the terminal; now close it. */
fclose (in);
strncpy(buf, tmp, bufsize);
memset(tmp, 0, tmplen);
free(tmp);
return buf;
}
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| Bearbeitung: |
Wenn ich was am Code ändere, kommt es hier rein.
|
--
Einfachheit ist Voraussetzung für Zuverlässigkeit.
-- Edsger Wybe Dijkstra
Dieser Post wurde am 07.07.2004 um 16:46 Uhr von 0xdeadbeef editiert. |
