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/* ttyname_r.c - A ttyname_r() replacement.
* Copyright (C) 2003, 2004, 2012 g10 Code GmbH
*
* This file is part of GPGME.
*
* GPGME 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.
*
* GPGME 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 this program; if not, see <https://gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if !HAVE_TTYNAME_R && defined(__GNUC__)
# warning ttyname is not thread-safe, and ttyname_r is missing
#endif
/* For Android we force the use of our replacement code. */
#if HAVE_ANDROID_SYSTEM
# undef HAVE_TTYNAME_R
#endif
int
_gpgme_ttyname_r (int fd, char *buf, size_t buflen)
{
#if HAVE_TTYNAME_R
# if HAVE_BROKEN_TTYNAME_R
/* Solaris fails if BUFLEN is less than 128. OSF/1 5.1 completely
ignores BUFLEN. We use a large buffer to woraround this. */
{
char largebuf[512];
size_t namelen;
int rc;
# if HAVE_POSIXDECL_TTYNAME_R
if (buflen < sizeof (largebuf))
{
rc = ttyname_r (fd, largebuf, (int)sizeof (largebuf));
if (!rc)
{
namelen = strlen (largebuf) + 1;
if (namelen > buflen)
rc = ERANGE;
else
memcpy (buf, largebuf, namelen);
}
}
else
rc = ttyname_r (fd, buf, (int)buflen);
# else /*!HAVE_POSIXDECL_TTYNAME_R*/
char *name;
if (buflen < sizeof (largebuf))
name = ttyname_r (fd, largebuf, (int)sizeof (largebuf));
else
name = ttyname_r (fd, buf, (int)buflen);
rc = name? 0 : (errno? errno : -1);
if (!rc && buf != name)
{
namelen = strlen (name) + 1;
if (namelen > buflen)
rc = ERANGE;
else
memmove (buf, name, namelen);
}
# endif
return rc;
}
# else /*!HAVE_BROKEN_TTYNAME_R*/
{
int rc;
# if HAVE_POSIXDECL_TTYNAME_R
rc = ttyname_r (fd, buf, buflen);
# else /*!HAVE_POSIXDECL_TTYNAME_R*/
char *name;
size_t namelen;
name = ttyname_r (fd, buf, (int)buflen);
rc = name? 0 : (errno? errno : -1);
if (!rc && buf != name)
{
namelen = strlen (name) + 1;
if (namelen > buflen)
rc = ERANGE;
else
memmove (buf, name, namelen);
}
# endif
return rc;
}
# endif /*!HAVE_BROKEN_TTYNAME_R*/
#else /*!HAVE_TTYNAME_R*/
char *tty;
# if HAVE_W32_SYSTEM || HAVE_ANDROID_SYSTEM
/* We use this default one for now. AFAICS we only need it to be
passed to gpg and in turn to pinentry. Providing a replacement
is needed because elsewhere we bail out on error or Android
provided ttyname_r prints an error message if used. */
tty = "/dev/tty";
# else
tty = ttyname (fd);
if (!tty)
return errno? errno : -1;
# endif
strncpy (buf, tty, buflen);
buf[buflen - 1] = '\0';
return (strlen (tty) >= buflen) ? ERANGE : 0;
#endif /*!HAVE_TTYNAME_R*/
}
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