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_perror: Print the last uci error that occured
  54  * @ctx: uci context
  55  * @str: string to print before the error message
  56  */
  57 extern void uci_perror(struct uci_context *ctx, const char *str);
  58
  59 /**
  60  * uci_load: Parse an uci config file and store it in the uci context
  61  *
  62  * @ctx: uci context
  63  * @name: name of the config file (relative to the config directory)
  64  */
  65 int uci_load(struct uci_context *ctx, const char *name);
  66
  67 /**
  68  * uci_cleanup: Clean up after an error
  69  *
  70  * @ctx: uci context
  71  */
  72 int uci_cleanup(struct uci_context *ctx);
  73
  74
  75 /* UCI data structures */
  76
  77 struct uci_context
  78 {
  79         struct uci_list root;
  80
  81         /* for error handling only */
  82         struct uci_parse_context *pctx;
  83
  84         /* private: */
  85         int errno;
  86         jmp_buf trap;
  87         jmp_buf trap_saved;
  88         int saved;
  89 };
  90
  91 struct uci_parse_context
  92 {
  93         int line;
  94         int byte;
  95
  96         /* private: */
  97         struct uci_config *cfg;
  98         FILE *file;
  99         char *buf;
 100         int bufsz;
 101 };
 102
 103 struct uci_config
 104 {
 105         struct uci_list list;
 106         struct uci_list sections;
 107         struct uci_context *ctx;
 108         char *name;
 109 };
 110
 111 struct uci_section
 112 {
 113         struct uci_list list;
 114         struct uci_list options;
 115         struct uci_config *config;
 116         char *type;
 117         char *name;
 118 };
 119
 120 struct uci_option
 121 {
 122         struct uci_list list;
 123         struct uci_section *section;
 124         char *name;
 125         char *value;
 126 };
 127
 128 /* linked list handling */
 129 #ifndef offsetof
 130 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 131 #endif
 132
 133 #define uci_list_empty(list) (list->next == ptr)
 134 #define uci_list_entry(_type, _ptr) \
 135         ((struct uci_ ## _type *) ((char *)(_ptr) - offsetof(struct uci_ ## _type,list)))
 136
 137 #define uci_foreach_entry(_type, _list, _ptr)           \
 138         for(_ptr = uci_list_entry(_type, (_list)->next);        \
 139                 &_ptr->list != (_list);                 \
 140                 _ptr = uci_list_entry(_type, _ptr->list.next))
 141
 142 #endif