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-rw-r--r--libguile/chooks.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/libguile/chooks.c b/libguile/chooks.c
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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 "libguile/__scm.h"
+#include "libguile/gc.h"
+#include "libguile/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;
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/