137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/* ttyname_r.c - A ttyname_r() replacement.
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* Copyright (C) 2003, 2004, 2012 g10 Code GmbH
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*
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* This file is part of GPGME.
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*
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* GPGME is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* GPGME is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <https://gnu.org/licenses/>.
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if !HAVE_TTYNAME_R && defined(__GNUC__)
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# warning ttyname is not thread-safe, and ttyname_r is missing
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#endif
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/* For Android we force the use of our replacement code. */
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#if HAVE_ANDROID_SYSTEM
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# undef HAVE_TTYNAME_R
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#endif
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int
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_gpgme_ttyname_r (int fd, char *buf, size_t buflen)
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{
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#if HAVE_TTYNAME_R
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# if HAVE_BROKEN_TTYNAME_R
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/* Solaris fails if BUFLEN is less than 128. OSF/1 5.1 completely
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ignores BUFLEN. We use a large buffer to woraround this. */
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{
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char largebuf[512];
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size_t namelen;
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int rc;
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# if HAVE_POSIXDECL_TTYNAME_R
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if (buflen < sizeof (largebuf))
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{
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rc = ttyname_r (fd, largebuf, (int)sizeof (largebuf));
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if (!rc)
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{
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namelen = strlen (largebuf) + 1;
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if (namelen > buflen)
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rc = ERANGE;
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else
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memcpy (buf, largebuf, namelen);
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}
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}
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else
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rc = ttyname_r (fd, buf, (int)buflen);
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# else /*!HAVE_POSIXDECL_TTYNAME_R*/
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char *name;
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if (buflen < sizeof (largebuf))
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name = ttyname_r (fd, largebuf, (int)sizeof (largebuf));
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else
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name = ttyname_r (fd, buf, (int)buflen);
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rc = name? 0 : (errno? errno : -1);
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if (!rc && buf != name)
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{
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namelen = strlen (name) + 1;
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if (namelen > buflen)
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rc = ERANGE;
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else
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memmove (buf, name, namelen);
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}
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# endif
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return rc;
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}
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# else /*!HAVE_BROKEN_TTYNAME_R*/
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{
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int rc;
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# if HAVE_POSIXDECL_TTYNAME_R
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rc = ttyname_r (fd, buf, buflen);
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# else /*!HAVE_POSIXDECL_TTYNAME_R*/
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char *name;
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size_t namelen;
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name = ttyname_r (fd, buf, (int)buflen);
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rc = name? 0 : (errno? errno : -1);
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if (!rc && buf != name)
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{
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namelen = strlen (name) + 1;
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if (namelen > buflen)
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rc = ERANGE;
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else
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memmove (buf, name, namelen);
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}
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# endif
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return rc;
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}
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# endif /*!HAVE_BROKEN_TTYNAME_R*/
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#else /*!HAVE_TTYNAME_R*/
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char *tty;
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# if HAVE_W32_SYSTEM || HAVE_ANDROID_SYSTEM
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/* We use this default one for now. AFAICS we only need it to be
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passed to gpg and in turn to pinentry. Providing a replacement
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is needed because elsewhere we bail out on error or Android
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provided ttyname_r prints an error message if used. */
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tty = "/dev/tty";
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# else
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tty = ttyname (fd);
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if (!tty)
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return errno? errno : -1;
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# endif
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strncpy (buf, tty, buflen);
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buf[buflen - 1] = '\0';
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return (strlen (tty) >= buflen) ? ERANGE : 0;
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#endif /*!HAVE_TTYNAME_R*/
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}
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