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    The file_date routine is mostly from GNU's fileutils package,
  19    written by Richard Stallman and David MacKenzie.
  20
  21    This file is part of the Midnight Commander.
  22
  23    The Midnight Commander is free software: you can redistribute it
  24    and/or modify it under the terms of the GNU General Public License as
  25    published by the Free Software Foundation, either version 3 of the License,
  26    or (at your option) any later version.
  27
  28    The Midnight Commander is distributed in the hope that it will be useful,
  29    but WITHOUT ANY WARRANTY; without even the implied warranty of
  30    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  31    GNU General Public License for more details.
  32
  33    You should have received a copy of the GNU General Public License
  34    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  35  */
  36
  37 /** \file
  38  *  \brief Source: hooks
  39  */
  40
  41 #include <config.h>
  42
  43 #include "lib/global.h"
  44 #include "lib/hook.h"
  45
  46 /*** global variables ****************************************************************************/
  47
  48 /*** file scope macro definitions ****************************************************************/
  49
  50 /*** file scope type declarations ****************************************************************/
  51
  52 /*** file scope variables ************************************************************************/
  53
  54 /*** file scope functions ************************************************************************/
  55
  56 /* --------------------------------------------------------------------------------------------- */
  57 /*** public functions ****************************************************************************/
  58 /* --------------------------------------------------------------------------------------------- */
  59
  60 void
  61 add_hook (hook_t ** hook_list, void (*hook_fn) (void *), void *data)
  62 {
  63     hook_t *new_hook = g_new (hook_t, 1);
  64
  65     new_hook->hook_fn = hook_fn;
  66     new_hook->next = *hook_list;
  67     new_hook->hook_data = data;
  68
  69     *hook_list = new_hook;
  70 }
  71
  72 /* --------------------------------------------------------------------------------------------- */
  73
  74 void
  75 execute_hooks (hook_t * hook_list)
  76 {
  77     hook_t *new_hook = NULL;
  78     hook_t *p;
  79
  80     /* We copy the hook list first so tahat we let the hook
  81      * function call delete_hook
  82      */
  83
  84     while (hook_list != NULL)
  85     {
  86         add_hook (&new_hook, hook_list->hook_fn, hook_list->hook_data);
  87         hook_list = hook_list->next;
  88     }
  89     p = new_hook;
  90
  91     while (new_hook != NULL)
  92     {
  93         new_hook->hook_fn (new_hook->hook_data);
  94         new_hook = new_hook->next;
  95     }
  96
  97     for (hook_list = p; hook_list != NULL;)
  98     {
  99         p = hook_list;
 100         hook_list = hook_list->next;
 101         g_free (p);
 102     }
 103 }
 104
 105 /* --------------------------------------------------------------------------------------------- */
 106
 107 void
 108 delete_hook (hook_t ** hook_list, void (*hook_fn) (void *))
 109 {
 110     hook_t *new_list = NULL;
 111     hook_t *current, *next;
 112
 113     for (current = *hook_list; current != NULL; current = next)
 114     {
 115         next = current->next;
 116         if (current->hook_fn == hook_fn)
 117             g_free (current);
 118         else
 119             add_hook (&new_list, current->hook_fn, current->hook_data);
 120     }
 121     *hook_list = new_list;
 122 }
 123
 124 /* --------------------------------------------------------------------------------------------- */
 125
 126 gboolean
 127 hook_present (hook_t * hook_list, void (*hook_fn) (void *))
 128 {
 129     hook_t *p;
 130
 131     for (p = hook_list; p != NULL; p = p->next)
 132         if (p->hook_fn == hook_fn)
 133             return TRUE;
 134     return FALSE;
 135 }
 136
 137 /* --------------------------------------------------------------------------------------------- */