lib/hook.c

   1 /*
   2    Hooks.
   3
   4    Slavaz: Warning! this file is deprecated and should be replaced
   5    by mcevents functional.
   6
   7    Copyright (C) 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003,
   8    2004, 2005, 2007, 2009, 2010, 2011
   9    The Free Software Foundation, Inc.
  10
  11    Written by:
  12    Miguel de Icaza, 1994, 1995, 1996
  13    Janne Kukonlehto, 1994, 1995, 1996
  14    Dugan Porter, 1994, 1995, 1996
  15    Jakub Jelinek, 1994, 1995, 1996
  16    Mauricio Plaza, 1994, 1995, 1996
  17
  18    This file is part of the Midnight Commander.
  19
  20    The Midnight Commander is free software: you can redistribute it
  21    and/or modify it under the terms of the GNU General Public License as
  22    published by the Free Software Foundation, either version 3 of the License,
  23    or (at your option) any later version.
  24
  25    The Midnight Commander is distributed in the hope that it will be useful,
  26    but WITHOUT ANY WARRANTY; without even the implied warranty of
  27    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28    GNU General Public License for more details.
  29
  30    You should have received a copy of the GNU General Public License
  31    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  32  */
  33
  34 /** \file
  35  *  \brief Source: hooks
  36  */
  37
  38 #include <config.h>
  39
  40 #include "lib/global.h"
  41 #include "lib/hook.h"
  42
  43 /*** global variables ****************************************************************************/
  44
  45 /*** file scope macro definitions ****************************************************************/
  46
  47 /*** file scope type declarations ****************************************************************/
  48
  49 /*** file scope variables ************************************************************************/
  50
  51 /*** file scope functions ************************************************************************/
  52
  53 /* --------------------------------------------------------------------------------------------- */
  54 /*** public functions ****************************************************************************/
  55 /* --------------------------------------------------------------------------------------------- */
  56
  57 void
  58 add_hook (hook_t ** hook_list, void (*hook_fn) (void *), void *data)
  59 {
  60     hook_t *new_hook = g_new (hook_t, 1);
  61
  62     new_hook->hook_fn = hook_fn;
  63     new_hook->next = *hook_list;
  64     new_hook->hook_data = data;
  65
  66     *hook_list = new_hook;
  67 }
  68
  69 /* --------------------------------------------------------------------------------------------- */
  70
  71 void
  72 execute_hooks (hook_t * hook_list)
  73 {
  74     hook_t *new_hook = NULL;
  75     hook_t *p;
  76
  77     /* We copy the hook list first so tahat we let the hook
  78      * function call delete_hook
  79      */
  80
  81     while (hook_list != NULL)
  82     {
  83         add_hook (&new_hook, hook_list->hook_fn, hook_list->hook_data);
  84         hook_list = hook_list->next;
  85     }
  86     p = new_hook;
  87
  88     while (new_hook != NULL)
  89     {
  90         new_hook->hook_fn (new_hook->hook_data);
  91         new_hook = new_hook->next;
  92     }
  93
  94     for (hook_list = p; hook_list != NULL;)
  95     {
  96         p = hook_list;
  97         hook_list = hook_list->next;
  98         g_free (p);
  99     }
 100 }
 101
 102 /* --------------------------------------------------------------------------------------------- */
 103
 104 void
 105 delete_hook (hook_t ** hook_list, void (*hook_fn) (void *))
 106 {
 107     hook_t *new_list = NULL;
 108     hook_t *current, *next;
 109
 110     for (current = *hook_list; current != NULL; current = next)
 111     {
 112         next = current->next;
 113         if (current->hook_fn == hook_fn)
 114             g_free (current);
 115         else
 116             add_hook (&new_list, current->hook_fn, current->hook_data);
 117     }
 118     *hook_list = new_list;
 119 }
 120
 121 /* --------------------------------------------------------------------------------------------- */
 122
 123 gboolean
 124 hook_present (hook_t * hook_list, void (*hook_fn) (void *))
 125 {
 126     hook_t *p;
 127
 128     for (p = hook_list; p != NULL; p = p->next)
 129         if (p->hook_fn == hook_fn)
 130             return TRUE;
 131     return FALSE;
 132 }
 133
 134 /* --------------------------------------------------------------------------------------------- */