uci.h

   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 #ifndef __LIBUCI_H
  16 #define __LIBUCI_H
  17
  18 #include <setjmp.h>
  19 #include <stdio.h>
  20
  21 #define UCI_CONFDIR "/etc/config"
  22
  23 enum
  24 {
  25         UCI_OK = 0,
  26         UCI_ERR_MEM,
  27         UCI_ERR_INVAL,
  28         UCI_ERR_NOTFOUND,
  29         UCI_ERR_IO,
  30         UCI_ERR_PARSE,
  31         UCI_ERR_UNKNOWN,
  32         UCI_ERR_LAST
  33 };
  34
  35 struct uci_list
  36 {
  37         void *next;
  38         void *prev;
  39 };
  40
  41 struct uci_config;
  42 struct uci_section;
  43 struct uci_option;
  44 struct uci_parse_context;
  45
  46
  47 /**
  48  * uci_alloc: Allocate a new uci context
  49  */
  50 extern struct uci_context *uci_alloc(void);
  51
  52 /**
  53  * uci_free: Free the uci context including all of its data
  54  */
  55 extern void uci_free(struct uci_context *ctx);
  56
  57 /**
  58  * uci_perror: Print the last uci error that occured
  59  * @ctx: uci context
  60  * @str: string to print before the error message
  61  */
  62 extern void uci_perror(struct uci_context *ctx, const char *str);
  63
  64 /**
  65  * uci_load: Parse an uci config file and store it in the uci context
  66  *
  67  * @ctx: uci context
  68  * @name: name of the config file (relative to the config directory)
  69  */
  70 extern int uci_load(struct uci_context *ctx, const char *name, struct uci_config **cfg);
  71
  72 /**
  73  * uci_unload: Unload a config file from the uci context
  74  *
  75  * @ctx: uci context
  76  * @name: name of the config file
  77  */
  78 extern int uci_unload(struct uci_context *ctx, const char *name);
  79
  80 /**
  81  * uci_cleanup: Clean up after an error
  82  *
  83  * @ctx: uci context
  84  */
  85 extern int uci_cleanup(struct uci_context *ctx);
  86
  87 /**
  88  * uci_list_configs: List available uci config files
  89  *
  90  * @ctx: uci context
  91  */
  92 extern char **uci_list_configs(struct uci_context *ctx);
  93
  94 /* UCI data structures */
  95
  96 struct uci_context
  97 {
  98         struct uci_list root;
  99
 100         /* for error handling only */
 101         struct uci_parse_context *pctx;
 102
 103         /* private: */
 104         int errno;
 105         jmp_buf trap;
 106 };
 107
 108 struct uci_parse_context
 109 {
 110         int line;
 111         int byte;
 112
 113         /* private: */
 114         struct uci_config *cfg;
 115         FILE *file;
 116         char *buf;
 117         char *reason;
 118         int bufsz;
 119 };
 120
 121 struct uci_config
 122 {
 123         struct uci_list list;
 124         struct uci_list sections;
 125         struct uci_context *ctx;
 126         char *name;
 127 };
 128
 129 struct uci_section
 130 {
 131         struct uci_list list;
 132         struct uci_list options;
 133         struct uci_config *config;
 134         char *type;
 135         char *name;
 136 };
 137
 138 struct uci_option
 139 {
 140         struct uci_list list;
 141         struct uci_section *section;
 142         char *name;
 143         char *value;
 144 };
 145
 146 /* linked list handling */
 147 #ifndef offsetof
 148 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 149 #endif
 150
 151 #define uci_list_empty(list) (list->next == ptr)
 152 #define uci_list_entry(_type, _ptr) \
 153         ((struct uci_ ## _type *) ((char *)(_ptr) - offsetof(struct uci_ ## _type,list)))
 154
 155 #define uci_foreach_entry(_type, _list, _ptr)           \
 156         for(_ptr = uci_list_entry(_type, (_list)->next);        \
 157                 &_ptr->list != (_list);                 \
 158                 _ptr = uci_list_entry(_type, _ptr->list.next))
 159
 160 #endif