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-rw-r--r--libguile/chooks.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/libguile/chooks.c b/libguile/chooks.c
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+++ b/libguile/chooks.c
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+/* Copyright 1995-1996,1998-2001,2003,2006,2008-2009,2011,2018
+ Free Software Foundation, Inc.
+
+ This file is part of Guile.
+
+ Guile 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.
+
+ Guile 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 Guile. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+
+
+#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;
+}