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 *
add_reference(refcounted_string_list_ty * rslp)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
drop_reference(refcounted_string_list_ty * rslp)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 */
68