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 #include <glob.h>
  16
  17 /* initialize a list head/item */
  18 static inline void uci_list_init(struct uci_list *ptr)
  19 {
  20         ptr->prev = ptr;
  21         ptr->next = ptr;
  22 }
  23
  24 /* inserts a new list entry between two consecutive entries */
  25 static inline void uci_list_insert(struct uci_list *list, struct uci_list *ptr)
  26 {
  27         list->next->prev = ptr;
  28         ptr->prev = list;
  29         ptr->next = list->next;
  30         list->next = ptr;
  31 }
  32
  33 /* inserts a new list entry at the tail of the list */
  34 static inline void uci_list_add(struct uci_list *head, struct uci_list *ptr)
  35 {
  36         /* NB: head->prev points at the tail */
  37         uci_list_insert(head->prev, ptr);
  38 }
  39
  40 static inline void uci_list_del(struct uci_list *ptr)
  41 {
  42         struct uci_list *next, *prev;
  43
  44         next = ptr->next;
  45         prev = ptr->prev;
  46
  47         prev->next = next;
  48         next->prev = prev;
  49
  50         uci_list_init(ptr);
  51 }
  52
  53 static struct uci_element *
  54 uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
  55 {
  56         struct uci_element *e;
  57         void *ptr;
  58
  59         ptr = uci_malloc(ctx, size + strlen(name) + 1);
  60         e = (struct uci_element *) ptr;
  61         e->type = type;
  62         e->name = (char *) ptr + size;
  63         strcpy(e->name, name);
  64         uci_list_init(&e->list);
  65
  66         return e;
  67 }
  68
  69 static void
  70 uci_free_element(struct uci_element *e)
  71 {
  72         if (!uci_list_empty(&e->list))
  73                 uci_list_del(&e->list);
  74         free(e);
  75 }
  76
  77 static struct uci_option *
  78 uci_alloc_option(struct uci_section *s, const char *name, const char *value)
  79 {
  80         struct uci_package *p = s->package;
  81         struct uci_context *ctx = p->ctx;
  82         struct uci_option *o;
  83
  84         o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
  85         o->value = uci_dataptr(o);
  86         o->section = s;
  87         strcpy(o->value, value);
  88         uci_list_add(&s->options, &o->e.list);
  89
  90         return o;
  91 }
  92
  93 static inline void
  94 uci_free_option(struct uci_option *o)
  95 {
  96         uci_free_element(&o->e);
  97 }
  98
  99 static struct uci_section *
 100 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
 101 {
 102         struct uci_context *ctx = p->ctx;
 103         struct uci_section *s;
 104         char buf[16];
 105
 106         if (!name || !name[0]) {
 107                 snprintf(buf, 16, "cfg%d", p->n_section);
 108                 name = buf;
 109         }
 110
 111         s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
 112         s->type = uci_dataptr(s);
 113         s->package = p;
 114         strcpy(s->type, type);
 115         uci_list_init(&s->options);
 116         uci_list_add(&p->sections, &s->e.list);
 117
 118         return s;
 119 }
 120
 121 static void
 122 uci_free_section(struct uci_section *s)
 123 {
 124         struct uci_element *o, *tmp;
 125
 126         uci_foreach_element_safe(&s->options, tmp, o) {
 127                 uci_free_option(uci_to_option(o));
 128         }
 129         uci_free_element(&s->e);
 130 }
 131
 132 static struct uci_package *
 133 uci_alloc_package(struct uci_context *ctx, const char *name)
 134 {
 135         struct uci_package *p;
 136
 137         p = uci_alloc_element(ctx, package, name, 0);
 138         p->ctx = ctx;
 139         uci_list_init(&p->sections);
 140         return p;
 141 }
 142
 143 static void
 144 uci_free_package(struct uci_package *p)
 145 {
 146         struct uci_element *e, *tmp;
 147
 148         if(!p)
 149                 return;
 150
 151         uci_foreach_element_safe(&p->sections, tmp, e) {
 152                 uci_free_section(uci_to_section(e));
 153         }
 154         uci_free_element(&p->e);
 155 }
 156
 157 static struct uci_element *uci_lookup_list(struct uci_context *ctx, struct uci_list *list, char *name)
 158 {
 159         struct uci_element *e;
 160
 161         uci_foreach_element(list, e) {
 162                 if (!strcmp(e->name, name))
 163                         return e;
 164         }
 165         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 166 }
 167
 168 int uci_lookup(struct uci_context *ctx, struct uci_element **res, char *package, char *section, char *option)
 169 {
 170         struct uci_element *e;
 171         struct uci_package *p;
 172         struct uci_section *s;
 173         struct uci_option *o;
 174
 175         UCI_HANDLE_ERR(ctx);
 176         UCI_ASSERT(ctx, res != NULL);
 177         UCI_ASSERT(ctx, package != NULL);
 178
 179         e = uci_lookup_list(ctx, &ctx->root, package);
 180         if (!section)
 181                 goto found;
 182
 183         p = uci_to_package(e);
 184         e = uci_lookup_list(ctx, &p->sections, section);
 185         if (!option)
 186                 goto found;
 187
 188         s = uci_to_section(e);
 189         e = uci_lookup_list(ctx, &s->options, option);
 190
 191 found:
 192         *res = e;
 193         return 0;
 194 }
 195
 196 int uci_unload(struct uci_context *ctx, const char *name)
 197 {
 198         struct uci_element *e;
 199
 200         UCI_HANDLE_ERR(ctx);
 201         UCI_ASSERT(ctx, name != NULL);
 202
 203         uci_foreach_element(&ctx->root, e) {
 204                 if (!strcmp(e->name, name))
 205                         goto found;
 206         }
 207         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 208
 209 found:
 210         uci_free_package(uci_to_package(e));
 211
 212         return 0;
 213 }
 214
 215