glib/gtrashstack.h

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  20  * file for a list of people on the GLib Team.  See the ChangeLog
  21  * files for a list of changes.  These files are distributed with
  22  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  23  */
  24
  25 #ifndef __G_TRASH_STACK_H__
  26 #define __G_TRASH_STACK_H__
  27
  28 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
  29 #error "Only <glib.h> can be included directly."
  30 #endif
  31
  32 #include <glib/gutils.h>
  33
  34 G_BEGIN_DECLS
  35
  36 typedef struct _GTrashStack GTrashStack;
  37 struct _GTrashStack
  38 {
  39   GTrashStack *next;
  40 };
  41
  42 G_INLINE_FUNC void      g_trash_stack_push   (GTrashStack **stack_p,
  43                                               gpointer      data_p);
  44 G_INLINE_FUNC gpointer  g_trash_stack_pop    (GTrashStack **stack_p);
  45 G_INLINE_FUNC gpointer  g_trash_stack_peek   (GTrashStack **stack_p);
  46 G_INLINE_FUNC guint     g_trash_stack_height (GTrashStack **stack_p);
  47
  48 #if defined (G_CAN_INLINE) || defined (__G_TRASH_STACK_C__)
  49
  50 G_INLINE_FUNC void
  51 g_trash_stack_push (GTrashStack **stack_p,
  52                     gpointer      data_p)
  53 {
  54   GTrashStack *data = (GTrashStack *) data_p;
  55
  56   data->next = *stack_p;
  57   *stack_p = data;
  58 }
  59 G_INLINE_FUNC gpointer
  60 g_trash_stack_pop (GTrashStack **stack_p)
  61 {
  62   GTrashStack *data;
  63
  64   data = *stack_p;
  65   if (data)
  66     {
  67       *stack_p = data->next;
  68       /* NULLify private pointer here, most platforms store NULL as
  69        * subsequent 0 bytes
  70        */
  71       data->next = NULL;
  72     }
  73
  74   return data;
  75 }
  76 G_INLINE_FUNC gpointer
  77 g_trash_stack_peek (GTrashStack **stack_p)
  78 {
  79   GTrashStack *data;
  80
  81   data = *stack_p;
  82
  83   return data;
  84 }
  85 G_INLINE_FUNC guint
  86 g_trash_stack_height (GTrashStack **stack_p)
  87 {
  88   GTrashStack *data;
  89   guint i = 0;
  90
  91   for (data = *stack_p; data; data = data->next)
  92     i++;
  93
  94   return i;
  95 }
  96
  97 #endif  /* G_CAN_INLINE || __G_TRASH_STACK_C__ */
  98
  99 G_END_DECLS
 100
 101 #endif /* __G_UTILS_H__ */