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/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
/* Prefix for master pseudo terminal nodes. */
#define _PATH_PTY "/dev/pty"
/* Letters indicating a series of pseudo terminals. */
#ifndef PTYNAME1
#define PTYNAME1 "pqrsPQRS"
#endif
const char _ptyname1[] = PTYNAME1;
/* Letters indicating the position within a series. */
#ifndef PTYNAME2
#define PTYNAME2 "0123456789abcdefghijklmnopqrstuv";
#endif
const char _ptyname2[] = PTYNAME2;
/* Open a master pseudo terminal and return its file descriptor. */
int
__getpt (void)
{
char buf[sizeof (_PATH_PTY) + 2];
const char *p, *q;
char *s;
memcpy (buf, _PATH_PTY, sizeof (_PATH_PTY));
s = buf + strlen (buf);
/* s[0] and s[1] will be filled in the loop. */
s[2] = '\0';
for (p = _ptyname1; *p != '\0'; ++p)
{
s[0] = *p;
for (q = _ptyname2; *q != '\0'; ++q)
{
int fd;
s[1] = *q;
fd = open (buf, O_RDWR);
if (fd != -1)
return fd;
if (errno == ENOENT)
return -1;
}
}
errno = ENOENT;
return -1;
}
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