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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [unistd/] [getpass.c] - Rev 1771
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/* Copyright (C) 1992,93,94,95,96,97,98,99 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <stdio.h> #include <string.h> #include <termios.h> #include <unistd.h> #include <string.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 #define PWD_BUFFER_SIZE 256 char * getpass (prompt) const char *prompt; { FILE *in, *out; struct termios s, t; int tty_changed; static char buf[PWD_BUFFER_SIZE]; int nread; /* 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", "r+"); if (in == NULL) { in = stdin; out = stderr; } else out = in; /* 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); if (in != stdin) { /* Disable buffering for read/write FILE to prevent problems with * fseek and buffering for read/write auto-transitioning. */ setvbuf(in, NULL, _IONBF, 0); } } else tty_changed = 0; /* Write the prompt. */ fputs(prompt, out); fflush(out); /* Read the password. */ fgets (buf, PWD_BUFFER_SIZE-1, in); if (buf != NULL) { nread = strlen(buf); if (nread < 0) buf[0] = '\0'; else if (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. */ if (tty_changed) { (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s); } if (in != stdin) /* We opened the terminal; now close it. */ fclose (in); return buf; }
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