list.c

   1 /*
   2  * libuci - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * this program is free software; you can redistribute it and/or modify
   6  * it under the terms of the gnu lesser general public license version 2.1
   7  * as published by the free software foundation
   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
  15 /* initialize a list head/item */
  16 static inline void uci_list_init(struct uci_list *ptr)
  17 {
  18         ptr->prev = ptr;
  19         ptr->next = ptr;
  20 }
  21
  22 /* inserts a new list entry between two consecutive entries */
  23 static inline void __uci_list_add(struct uci_list *prev, struct uci_list *next, struct uci_list *ptr)
  24 {
  25         prev->next = ptr;
  26         next->prev = ptr;
  27         ptr->prev = prev;
  28         ptr->next = next;
  29 }
  30
  31 /* inserts a new list entry at the tail of the list */
  32 static inline void uci_list_add(struct uci_list *head, struct uci_list *ptr)
  33 {
  34         /* NB: head->prev points at the tail */
  35         __uci_list_add(head->prev, head, ptr);
  36 }
  37
  38 static inline void uci_list_del(struct uci_list *ptr)
  39 {
  40         struct uci_list *next, *prev;
  41
  42         next = ptr->next;
  43         prev = ptr->prev;
  44
  45         prev->next = next;
  46         next->prev = prev;
  47 }
  48
  49 static void uci_drop_section(struct uci_section *section)
  50 {
  51         if (!section)
  52                 return;
  53         /* TODO: drop options */
  54         if (section->name)
  55                 free(section->name);
  56         if (section->type)
  57                 free(section->type);
  58         free(section);
  59 }
  60
  61 static struct uci_section *uci_add_section(struct uci_config *cfg, const char *type, const char *name)
  62 {
  63         struct uci_section *section = NULL;
  64         struct uci_context *ctx = cfg->ctx;
  65
  66         UCI_TRAP_SAVE(ctx, error)
  67         section = (struct uci_section *) uci_malloc(ctx, sizeof(struct uci_section));
  68         section->config = cfg;
  69         uci_list_init(&section->list);
  70         uci_list_init(&section->options);
  71         uci_list_add(&cfg->sections, &section->list);
  72         section->type = uci_strdup(ctx, type);
  73         if (name)
  74                 section->name = uci_strdup(ctx, name);
  75         UCI_TRAP_RESTORE(ctx);
  76
  77         return section;
  78
  79 error:
  80         uci_drop_section(section);
  81         UCI_THROW(ctx, ctx->errno);
  82         return NULL;
  83 }
  84
  85 static void uci_drop_file(struct uci_config *cfg)
  86 {
  87         struct uci_section *s;
  88
  89         if(!cfg)
  90                 return;
  91         uci_foreach_entry(section, &cfg->sections, s) {
  92                 uci_drop_section(s);
  93         }
  94         if (cfg->name)
  95                 free(cfg->name);
  96         free(cfg);
  97 }
  98
  99
 100 static struct uci_config *uci_alloc_file(struct uci_context *ctx, const char *name)
 101 {
 102         struct uci_config *cfg = NULL;
 103
 104         UCI_TRAP_SAVE(ctx, error)
 105         cfg = (struct uci_config *) uci_malloc(ctx, sizeof(struct uci_config));
 106         uci_list_init(&cfg->list);
 107         uci_list_init(&cfg->sections);
 108         cfg->name = uci_strdup(ctx, name);
 109         cfg->ctx = ctx;
 110         UCI_TRAP_RESTORE(ctx);
 111         return cfg;
 112
 113 error:
 114         uci_drop_file(cfg);
 115         UCI_THROW(ctx, ctx->errno);
 116         return NULL;
 117 }
 118