/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ This program is free software; you can redistribute it and/or modify         │
│ it under the terms of the GNU General Public License as published by         │
│ the Free Software Foundation; version 2 of the License.                      │
│                                                                              │
│ This program 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             │
│ General Public License for more details.                                     │
│                                                                              │
│ You should have received a copy of the GNU General Public License            │
│ along with this program; if not, write to the Free Software                  │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
│ 02110-1301 USA                                                               │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/termios.h"
#include "libc/errno.h"
#include "libc/fmt/fmt.h"
#include "libc/sysv/consts/termios.h"
#include "libc/sysv/errfuns.h"

errno_t ptsname_r(int fd, char *buf, size_t size) {
  int pty;
  if (size) {
    if (!buf) return einval();
    if (ioctl(fd, TIOCGPTN, &pty) == -1) return errno;
    if (snprintf(buf, size, "/dev/pts/%d", pty) >= size) {
      return (errno = ERANGE);
    }
    /* TODO(jart): OpenBSD OMG */
  }
  return 0;
}