From 9cc0d6d3f8a89f35ddea92e30bdc2822c4164358 Mon Sep 17 00:00:00 2001
From: Marcus Brinkmann <marcus@gnu.org>
Date: Thu, 22 Aug 2002 19:24:19 +0000
Subject: libcons/ 2002-08-22  Marcus Brinkmann  <marcus@gnu.org>

	* demuxer.c, init-init.c, init-loop.c, opts-version.c,
	extra-version.c, dir-changed.c, file-changed.c,
	opts-std-startup.c, cons-lookup.c, cons-switch.c, vcons-remove.c,
	vcons-add.c, vcons-open.c, vcons-close.c, vcons-refresh.c, priv.h,
	mutations.h, cons.h: New files.
---
 libcons/cons-lookup.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 libcons/cons-lookup.c

(limited to 'libcons/cons-lookup.c')

diff --git a/libcons/cons-lookup.c b/libcons/cons-lookup.c
new file mode 100644
index 00000000..f3bdabef
--- /dev/null
+++ b/libcons/cons-lookup.c
@@ -0,0 +1,134 @@
+/* cons-lookup.c - Looking up virtual consoles.
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   Written by Marcus Brinkmann.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include <errno.h>
+#include <malloc.h>
+#include <sys/mman.h>
+
+#include "cons.h"
+
+/* Lookup the virtual console with number ID in the console CONS,
+   acquire a reference for it, and return it in R_VCONS.  If CREATE is
+   true, the virtual console will be created if it doesn't exist yet.
+   If CREATE is true, and ID 0, the first free virtual console id is
+   used.  CONS must be locked.  */
+error_t
+cons_lookup (cons_t cons, int id, int create, vcons_t *r_vcons)
+{
+  vcons_t previous_vcons = 0;
+  vcons_t vcons;
+
+  if (!id && !create)
+    return EINVAL;
+
+  if (id)
+    {
+      if (cons->vcons_list && cons->vcons_list->id <= id)
+        {
+	  previous_vcons = cons->vcons_list;
+          while (previous_vcons->next && previous_vcons->next->id <= id)
+            previous_vcons = previous_vcons->next;
+          if (previous_vcons->id == id)
+            {
+              /* previous_vcons->refcnt++; */
+              *r_vcons = previous_vcons;
+              return 0;
+            }
+        }
+      else if (!create)
+	return ESRCH;
+    }
+  else
+    {
+      id = 1;
+      if (cons->vcons_list && cons->vcons_list->id == 1)
+        {
+	  previous_vcons = cons->vcons_list;
+          while (previous_vcons && previous_vcons->id == id)
+            {
+              id++;
+              previous_vcons = previous_vcons->next;
+            }
+        }
+    }
+
+  vcons = calloc (1, sizeof (struct vcons));
+  if (!vcons)
+    {
+      mutex_unlock (&vcons->cons->lock);
+      return ENOMEM;
+    }
+  vcons->cons = cons;
+  /* vcons->refcnt = 1; */
+  vcons->id = id;
+  mutex_init (&vcons->lock);
+  vcons->input = -1;
+  vcons->display = MAP_FAILED;
+  vcons->notify = NULL;
+
+#if 0
+  err = display_create (&vcons->display, cons->encoding ?: DEFAULT_ENCODING,
+                        cons->foreground, cons->background);
+  if (err)
+    {
+      free (vcons->name);
+      free (vcons);
+      return err;
+    }
+
+  err = input_create (&vcons->input, cons->encoding ?: DEFAULT_ENCODING);
+  if (err)
+    {
+      display_destroy (vcons->display);
+      free (vcons->name);
+      free (vcons);
+      return err;
+    }
+#endif
+
+  cons_vcons_add (vcons);
+
+  /* Insert the virtual console into the doubly linked list.  */
+  if (previous_vcons)
+    {
+      vcons->prev = previous_vcons;
+      if (previous_vcons->next)
+        {
+          previous_vcons->next->prev = vcons;
+          vcons->next = previous_vcons->next;
+        }
+      else
+	cons->vcons_last = vcons;
+      previous_vcons->next = vcons;
+    }
+  else
+    {
+      if (cons->vcons_list)
+        {
+          cons->vcons_list->prev = vcons;
+          vcons->next = cons->vcons_list;
+        }
+      else
+	cons->vcons_last = vcons;
+      cons->vcons_list = vcons;
+    }
+  *r_vcons = vcons;
+  return 0;
+}
-- 
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