src/country-list.c

   1 /*
   2         libloc - A library to determine the location of someone on the Internet
   3
   4         Copyright (C) 2020 IPFire Development Team <info@ipfire.org>
   5
   6         This library is free software; you can redistribute it and/or
   7         modify it under the terms of the GNU Lesser General Public
   8         License as published by the Free Software Foundation; either
   9         version 2.1 of the License, or (at your option) any later version.
  10
  11         This library 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 GNU
  14         Lesser General Public License for more details.
  15 */
  16
  17 #include <errno.h>
  18 #include <stdlib.h>
  19
  20 #include <loc/country.h>
  21 #include <loc/country-list.h>
  22 #include <loc/private.h>
  23
  24 struct loc_country_list {
  25         struct loc_ctx* ctx;
  26         int refcount;
  27
  28         struct loc_country** elements;
  29         size_t elements_size;
  30
  31         size_t size;
  32 };
  33
  34 static int loc_country_list_grow(struct loc_country_list* list, size_t size) {
  35         DEBUG(list->ctx, "Growing country list %p by %zu to %zu\n",
  36                 list, size, list->elements_size + size);
  37
  38         struct loc_country** elements = reallocarray(list->elements,
  39                         list->elements_size + size, sizeof(*list->elements));
  40         if (!elements)
  41                 return -errno;
  42
  43         list->elements = elements;
  44         list->elements_size += size;
  45
  46         return 0;
  47 }
  48
  49 LOC_EXPORT int loc_country_list_new(struct loc_ctx* ctx,
  50                 struct loc_country_list** list) {
  51         struct loc_country_list* l = calloc(1, sizeof(*l));
  52         if (!l)
  53                 return -ENOMEM;
  54
  55         l->ctx = loc_ref(ctx);
  56         l->refcount = 1;
  57
  58         DEBUG(l->ctx, "Country list allocated at %p\n", l);
  59         *list = l;
  60
  61         return 0;
  62 }
  63
  64 LOC_EXPORT struct loc_country_list* loc_country_list_ref(struct loc_country_list* list) {
  65         list->refcount++;
  66
  67         return list;
  68 }
  69
  70 static void loc_country_list_free(struct loc_country_list* list) {
  71         DEBUG(list->ctx, "Releasing country list at %p\n", list);
  72
  73         loc_country_list_clear(list);
  74
  75         loc_unref(list->ctx);
  76         free(list);
  77 }
  78
  79 LOC_EXPORT struct loc_country_list* loc_country_list_unref(struct loc_country_list* list) {
  80         if (!list)
  81                 return NULL;
  82
  83         if (--list->refcount > 0)
  84                 return list;
  85
  86         loc_country_list_free(list);
  87         return NULL;
  88 }
  89
  90 LOC_EXPORT size_t loc_country_list_size(struct loc_country_list* list) {
  91         return list->size;
  92 }
  93
  94 LOC_EXPORT int loc_country_list_empty(struct loc_country_list* list) {
  95         return list->size == 0;
  96 }
  97
  98 LOC_EXPORT void loc_country_list_clear(struct loc_country_list* list) {
  99         for (unsigned int i = 0; i < list->size; i++)
 100                 loc_country_unref(list->elements[i]);
 101 }
 102
 103 LOC_EXPORT struct loc_country* loc_country_list_get(struct loc_country_list* list, size_t index) {
 104         // Check index
 105         if (index >= list->size)
 106                 return NULL;
 107
 108         return loc_country_ref(list->elements[index]);
 109 }
 110
 111 LOC_EXPORT int loc_country_list_append(
 112                 struct loc_country_list* list, struct loc_country* country) {
 113         if (loc_country_list_contains(list, country))
 114                 return 0;
 115
 116         // Check if we have space left
 117         if (list->size >= list->elements_size) {
 118                 int r = loc_country_list_grow(list, 64);
 119                 if (r)
 120                         return r;
 121         }
 122
 123         DEBUG(list->ctx, "%p: Appending country %p to list\n", list, country);
 124
 125         list->elements[list->size++] = loc_country_ref(country);
 126
 127         return 0;
 128 }
 129
 130 LOC_EXPORT int loc_country_list_contains(
 131                 struct loc_country_list* list, struct loc_country* country) {
 132         for (unsigned int i = 0; i < list->size; i++) {
 133                 if (loc_country_cmp(country, list->elements[i]) == 0)
 134                         return 1;
 135         }
 136
 137         return 0;
 138 }
 139
 140 LOC_EXPORT int loc_country_list_contains_code(
 141                 struct loc_country_list* list, const char* code) {
 142         struct loc_country* country;
 143
 144         int r = loc_country_new(list->ctx, &country, code);
 145         if (r)
 146                 return -1;
 147
 148         r = loc_country_list_contains(list, country);
 149         loc_country_unref(country);
 150
 151         return r;
 152 }