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/* Copyright (C) 1995-1996,1998-2001,2003,2006,2008-2009,2011,2018
* Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include "gc.h"
#include "chooks.h"
/* C level hooks
*
*/
/* Hint for `scm_gc_malloc ()' and friends. */
static const char hook_entry_gc_hint[] = "hook entry";
void
scm_c_hook_init (scm_t_c_hook *hook, void *hook_data, scm_t_c_hook_type type)
{
hook->first = 0;
hook->type = type;
hook->data = hook_data;
}
void
scm_c_hook_add (scm_t_c_hook *hook,
scm_t_c_hook_function func,
void *fn_data,
int appendp)
{
scm_t_c_hook_entry *entry;
scm_t_c_hook_entry **loc = &hook->first;
entry = scm_gc_malloc (sizeof (scm_t_c_hook_entry), hook_entry_gc_hint);
if (appendp)
while (*loc)
loc = &(*loc)->next;
entry->next = *loc;
entry->func = func;
entry->data = fn_data;
*loc = entry;
}
void
scm_c_hook_remove (scm_t_c_hook *hook,
scm_t_c_hook_function func,
void *fn_data)
{
scm_t_c_hook_entry **loc = &hook->first;
while (*loc)
{
if ((*loc)->func == func && (*loc)->data == fn_data)
{
*loc = (*loc)->next;
return;
}
loc = &(*loc)->next;
}
fprintf (stderr, "Attempt to remove non-existent hook function\n");
abort ();
}
void *
scm_c_hook_run (scm_t_c_hook *hook, void *data)
{
scm_t_c_hook_entry *entry = hook->first;
scm_t_c_hook_type type = hook->type;
void *res = 0;
while (entry)
{
res = (entry->func) (hook->data, entry->data, data);
if (res)
{
if (type == SCM_C_HOOK_OR)
break;
}
else
{
if (type == SCM_C_HOOK_AND)
break;
}
entry = entry->next;
}
return res;
}
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