libxenlight: initial libxenlight implementation under tools/libxl

Signed-off-by: Vincent Hanquez <Vincent.Hanquez@eu.citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/tools/libxl/flexarray.c b/tools/libxl/flexarray.c
new file mode 100644
index 0000000000..ba7f5e1902
--- /dev/null
+++ b/tools/libxl/flexarray.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2009      Citrix Ltd.
+ * Author Vincent Hanquez <vincent.hanquez@eu.citrix.com>
+ *
+ * This program 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; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program 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.
+ */
+
+#include <stdlib.h>
+#include "flexarray.h"
+
+flexarray_t *flexarray_make(int size, int autogrow)
+{
+    flexarray_t *array = malloc(sizeof(struct flexarray));
+    if (array) {
+        array->size = size;
+        array->autogrow = autogrow;
+        array->data = calloc(size, sizeof(void *));
+    }
+    return array;
+}
+
+void flexarray_free(flexarray_t *array)
+{
+    free(array->data);
+    free(array);
+}
+
+int flexarray_grow(flexarray_t *array, int extents)
+{
+    void **data;
+    int newsize;
+
+    newsize = array->size + extents;
+    data = realloc(array->data, sizeof(void *) * newsize);
+    if (!data)
+        return 1;
+    array->size += extents;
+    array->data = data;
+    return 0;
+}
+
+int flexarray_set(flexarray_t *array, unsigned int index, void *ptr)
+{
+    if (index >= array->size) {
+        int newsize;
+        if (!array->autogrow)
+            return 1;
+        newsize = (array->size * 2 < index) ? index + 1 : array->size * 2;
+        if (flexarray_grow(array, newsize - array->size))
+            return 2;
+    }
+    array->data[index] = ptr;
+    return 0;
+}
+
+int flexarray_get(flexarray_t *array, int index, void **ptr)
+{
+    if (index >= array->size)
+        return 1;
+    *ptr = array->data[index];
+    return 0;
+}
+
+void **flexarray_contents(flexarray_t *array)
+{
+    void **data;
+    data = array->data;
+    free(array);
+    return data;
+}