src/common/utils/clist_helpers.h

   1 // Copyright (c) 2015 Samsung Electronics Co., Ltd All Rights Reserved
   2 // Use of this source code is governed by an apache 2.0 license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMMON_UTILS_CLIST_HELPERS_H_
   6 #define COMMON_UTILS_CLIST_HELPERS_H_
   7
   8 #include "pkgmgr/pkgmgr_parser.h"
   9
  10 /* NOTE: For *_x list types in pkgmgr-info, like privileges_x or privilege_x,
  11  * this macro moves the current node to the head of the list.
  12  * This LISTHEAD() macro is defined in pkgmgr_parser.h in pkgmgr-info package.
  13  */
  14 #define PKGMGR_LIST_MOVE_NODE_TO_HEAD(list, node)                              \
  15   do {                                                                         \
  16     if (list) {                                                                \
  17       LISTHEAD(list, node);                                                    \
  18     }                                                                          \
  19   } while (false)                                                              \
  20
  21 /*
  22  * Calculates size of C style list from any of its point
  23  */
  24 #define PKGMGR_LIST_LEN(list)                                                  \
  25   [list]() {                                                                   \
  26     size_t size = 0;                                                           \
  27     auto node = list;                                                          \
  28     PKGMGR_LIST_MOVE_NODE_TO_HEAD(list, node);                                 \
  29     while (node) {                                                             \
  30       node = node->next;                                                       \
  31       ++size;                                                                  \
  32     }                                                                          \
  33     return size;                                                               \
  34   }()                                                                          \
  35
  36 #endif  // COMMON_UTILS_CLIST_HELPERS_H_