src/networkd/json.h

   1 /*#############################################################################
   2 #                                                                             #
   3 # IPFire.org - A linux based firewall                                         #
   4 # Copyright (C) 2023 IPFire Network Development Team                          #
   5 #                                                                             #
   6 # This program is free software: you can redistribute it and/or modify        #
   7 # it under the terms of the GNU General Public License as published by        #
   8 # the Free Software Foundation, either version 3 of the License, or           #
   9 # (at your option) any later version.                                         #
  10 #                                                                             #
  11 # This program is distributed in the hope that it will be useful,             #
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  14 # GNU General Public License for more details.                                #
  15 #                                                                             #
  16 # You should have received a copy of the GNU General Public License           #
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  18 #                                                                             #
  19 #############################################################################*/
  20
  21 #ifndef NETWORKD_JSON_H
  22 #define NETWORKD_JSON_H
  23
  24 #include <errno.h>
  25 #include <string.h>
  26
  27 #include <json.h>
  28
  29 // Give some sane names to the reference count functions
  30 #define json_object_ref json_object_get
  31 #define json_object_unref json_object_put
  32
  33 static inline int __json_object_add(struct json_object* o,
  34                 const char* key, struct json_object* value) {
  35         int r;
  36
  37         // Add the object
  38         r = json_object_object_add(o, key, value);
  39         if (r < 0) {
  40                 if (value)
  41                         json_object_unref(value);
  42         }
  43
  44         return r;
  45 }
  46
  47 static inline int json_object_add_string(struct json_object* o,
  48                 const char* key, const char* value) {
  49         struct json_object* element = NULL;
  50
  51         // Create a JSON object from the string
  52         element = json_object_new_string(value);
  53         if (!element)
  54                 return -errno;
  55
  56         return __json_object_add(o, key, element);
  57 }
  58
  59 static inline int json_object_add_int64(struct json_object* o,
  60                 const char* key, const int64_t value) {
  61         struct json_object* element = NULL;
  62
  63         // Create a JSON object
  64         element = json_object_new_int64(value);
  65         if (!element)
  66                 return -errno;
  67
  68         return __json_object_add(o, key, element);
  69 }
  70
  71 static inline int json_to_string(struct json_object* o, char** s, size_t* l) {
  72         // Format JSON to string
  73         const char* buffer = json_object_to_json_string_ext(o,
  74                 JSON_C_TO_STRING_PRETTY|JSON_C_TO_STRING_PRETTY_TAB);
  75         if (!buffer)
  76                 return -errno;
  77
  78         // Copy the string to the heap
  79         *s = strdup(buffer);
  80         if (!*s)
  81                 return -errno;
  82
  83         // If requested, store the length of the string
  84         if (l)
  85                 *l = strlen(*s);
  86
  87         return 0;
  88 }
  89
  90 static inline const char* json_object_fetch_string(
  91                 struct json_object* o, const char* key) {
  92         struct json_object* e = json_object_object_get(o, key);
  93         if (!e)
  94                 return NULL;
  95
  96         return json_object_get_string(e);
  97 }
  98
  99 #endif /* NETWORKD_JSON_H */