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-rw-r--r--src/ttyname_r.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/src/ttyname_r.c b/src/ttyname_r.c
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+++ b/src/ttyname_r.c
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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 <http://www.gnu.org/licenses/>.
+ */
+
+#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
+
+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
+ /* 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. If we
+ eventually implement a pinentry for Windows it is inlikely that
+ we need a real tty at all. */
+ 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*/
+}