1  /* Reference-counted string list.
       2     Copyright (C) 2001-2018 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation; either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #ifndef _RC_STR_LIST_H
      18  #define _RC_STR_LIST_H
      19  
      20  #include <stdlib.h>
      21  
      22  #include "str-list.h"
      23  
      24  #ifdef __cplusplus
      25  extern "C" {
      26  #endif
      27  
      28  
      29  /* A reference-counted list-of-immutable-strings type.  */
      30  
      31  typedef struct refcounted_string_list_ty refcounted_string_list_ty;
      32  struct refcounted_string_list_ty
      33  {
      34    unsigned int refcount;
      35    struct string_list_ty contents;
      36  };
      37  
      38  static inline refcounted_string_list_ty *
      39  add_reference (refcounted_string_list_ty *rslp)
      40  {
      41    if (rslp != NULL)
      42      rslp->refcount++;
      43    return rslp;
      44  }
      45  
      46  static inline void
      47  drop_reference (refcounted_string_list_ty *rslp)
      48  {
      49    if (rslp != NULL)
      50      {
      51        if (rslp->refcount > 1)
      52          rslp->refcount--;
      53        else
      54          {
      55            string_list_destroy (&rslp->contents);
      56            free (rslp);
      57          }
      58      }
      59  }
      60  
      61  
      62  #ifdef __cplusplus
      63  }
      64  #endif
      65  
      66  
      67  #endif /* _RC_STR_LIST_H */