diff options
Diffstat (limited to 'src/ttyname_r.c')
-rw-r--r-- | src/ttyname_r.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/ttyname_r.c b/src/ttyname_r.c new file mode 100644 index 0000000..105e0af --- /dev/null +++ b/src/ttyname_r.c @@ -0,0 +1,130 @@ +/* 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*/ +} |