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Diffstat (limited to 'REORG.TODO/misc/getpass.c')
-rw-r--r-- | REORG.TODO/misc/getpass.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/REORG.TODO/misc/getpass.c b/REORG.TODO/misc/getpass.c new file mode 100644 index 0000000000..89c783fe20 --- /dev/null +++ b/REORG.TODO/misc/getpass.c @@ -0,0 +1,124 @@ +/* Copyright (C) 1992-2017 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 <stdio_ext.h> +#include <string.h> /* For string function builtin redirect. */ +#include <termios.h> +#include <unistd.h> + +#include <wchar.h> +#define flockfile(s) _IO_flockfile (s) +#define funlockfile(s) _IO_funlockfile (s) +#include <libc-lock.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 + +static void +call_fclose (void *arg) +{ + if (arg != NULL) + fclose (arg); +} + +char * +getpass (const char *prompt) +{ + FILE *in, *out; + struct termios s, t; + int tty_changed; + static char *buf; + static size_t bufsize; + ssize_t 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", "w+ce"); + if (in == NULL) + { + in = stdin; + out = stderr; + } + else + { + /* We do the locking ourselves. */ + __fsetlocking (in, FSETLOCKING_BYCALLER); + + out = in; + } + + /* Make sure the stream we opened is closed even if the thread is + canceled. */ + __libc_cleanup_push (call_fclose, in == out ? in : NULL); + + 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; + + /* Write the prompt. */ + __fxprintf (out, "%s", prompt); + __fflush_unlocked (out); + + /* Read the password. */ + nread = __getline (&buf, &bufsize, in); + if (buf != NULL) + { + 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. */ + __fxprintf (out, "\n"); + } + } + + /* Restore the original setting. */ + if (tty_changed) + (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s); + + funlockfile (out); + + __libc_cleanup_pop (0); + + if (in != stdin) + /* We opened the terminal; now close it. */ + fclose (in); + + return buf; +} |