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- /* Copyright (C) 1992-1999,2001,2003,2004,2005 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, see
- <http://www.gnu.org/licenses/>. */
- #include <stdio.h>
- #include <string.h>
- #include <termios.h>
- #include <unistd.h>
- #include <malloc.h>
- #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
- /* 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
- #define PWD_BUFFER_SIZE 256
- char * getpass (const char *prompt)
- {
- FILE *in, *out;
- struct termios s, t;
- int tty_changed;
- static char *buf = NULL;
- int nread;
- if (buf == NULL)
- buf = (char *)__uc_malloc(PWD_BUFFER_SIZE);
- /* Try to write to and read from the terminal if we can.
- If we can't open the terminal, use stderr and stdin. */
- out = in = fopen ("/dev/tty", "r+");
- if (in == NULL)
- {
- in = stdin;
- out = stderr;
- }
- else
- {
- /* Disable buffering for read/write FILE to prevent problems with
- * fseek and buffering for read/write auto-transitioning. */
- setvbuf(in, NULL, _IONBF, 0);
- }
- /* Turn echoing off if it is on now. */
- tty_changed = 0;
- 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);
- }
- /* Write the prompt. */
- fputs(prompt, out);
- fflush(out);
- /* Read the password. */
- if (!fgets (buf, PWD_BUFFER_SIZE, in))
- buf[0] = '\0';
- nread = strlen(buf);
- if (nread > 0 && buf[nread - 1] == '\n')
- /* Remove the newline. */
- buf[nread - 1] = '\0';
- if (tty_changed)
- {
- /* Write the newline that was not echoed. */
- putc('\n', out);
- /* Restore the original setting. */
- (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
- }
- if (in != stdin)
- /* We opened the terminal; now close it. */
- fclose (in);
- return buf;
- }
- #endif
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