Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 104 insertions, 0 deletions

diff --git a/wsutil/wmem/wmem_user_cb.c b/wsutil/wmem/wmem_user_cb.c
new file mode 100644
index 00000000..232b1692
--- /dev/null
+++ b/wsutil/wmem/wmem_user_cb.c
@@ -0,0 +1,104 @@
+/* wmem_user_cb.c
+ * Wireshark Memory Manager User Callbacks
+ * Copyright 2012, Evan Huus <eapache@gmail.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "wmem_core.h"
+#include "wmem_allocator.h"
+
+#include "wmem_user_cb.h"
+#include "wmem_user_cb_int.h"
+
+typedef struct _wmem_user_cb_container_t {
+    wmem_user_cb_t                    cb;
+    void                             *user_data;
+    struct _wmem_user_cb_container_t *next;
+    unsigned                          id;
+} wmem_user_cb_container_t;
+
+void
+wmem_call_callbacks(wmem_allocator_t *allocator, wmem_cb_event_t event)
+{
+    wmem_user_cb_container_t **prev, *cur;
+    bool again;
+
+    prev = &(allocator->callbacks);
+    cur  = allocator->callbacks;
+
+    while (cur) {
+
+        /* call it */
+        again = cur->cb(allocator, event, cur->user_data);
+
+        /* if the callback requested deregistration, or this is being triggered
+         * by the final destruction of the allocator, remove the callback */
+        if (! again || event == WMEM_CB_DESTROY_EVENT) {
+            *prev = cur->next;
+            wmem_free(NULL, cur);
+            cur = *prev;
+        }
+        else {
+            prev = &(cur->next);
+            cur  = cur->next;
+        }
+    }
+}
+
+unsigned
+wmem_register_callback(wmem_allocator_t *allocator,
+        wmem_user_cb_t callback, void *user_data)
+{
+    wmem_user_cb_container_t *container;
+    static unsigned next_id = 1;
+
+    container = wmem_new(NULL, wmem_user_cb_container_t);
+
+    container->cb        = callback;
+    container->user_data = user_data;
+    container->next      = allocator->callbacks;
+    container->id        = next_id++;
+
+    allocator->callbacks = container;
+
+    return container->id;
+}
+
+void
+wmem_unregister_callback(wmem_allocator_t *allocator, unsigned id)
+{
+    wmem_user_cb_container_t **prev, *cur;
+
+    prev = &(allocator->callbacks);
+    cur  = allocator->callbacks;
+
+    while (cur) {
+
+        if (cur->id == id) {
+            *prev = cur->next;
+            wmem_free(NULL, cur);
+            return;
+        }
+
+        prev = &(cur->next);
+        cur  = cur->next;
+    }
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */