From a3e03be058a9b9a2caf36c5b18f66c0fc3df3bf0 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Tue, 8 May 2001 19:58:20 +0000
Subject: Add in libutil, based on Cory Visi's variant of Michael Shmulevich's
 libutil port.  I have reworked the code quite a bit so that the stuff that is
 supposed to be in libc is in libc, and I added a bunch of missing stuff so
 the libutil interface matches that of glibc's libutil.  The only caveat is
 that libutil/login.c is currently a stub.  -Erik

---
 libc/stdlib/bsd_getpt.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 libc/stdlib/bsd_getpt.c

(limited to 'libc/stdlib/bsd_getpt.c')

diff --git a/libc/stdlib/bsd_getpt.c b/libc/stdlib/bsd_getpt.c
new file mode 100644
index 000000000..0f981ab95
--- /dev/null
+++ b/libc/stdlib/bsd_getpt.c
@@ -0,0 +1,78 @@
+/* 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) - 1);
+  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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