ucimap.h

   1 /*
   2  * ucimap - library for mapping uci sections into data structures
   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 General Public License version 2
   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 #ifndef __UCIMAP_H
  15 #define __UCIMAP_H
  16
  17 #include <stdbool.h>
  18 #include "uci_list.h"
  19 #include "uci.h"
  20
  21 #ifndef ARRAY_SIZE
  22 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  23 #endif
  24
  25 #define BITFIELD_SIZE(_fields) (((_fields) / 8) + 1)
  26
  27 #define CLR_BIT(_name, _bit) do { \
  28         _name[(_bit) / 8] &= ~(1 << ((_bit) % 8)); \
  29 } while (0)
  30
  31 #define SET_BIT(_name, _bit) do { \
  32         _name[(_bit) / 8] |=  (1 << ((_bit) % 8)); \
  33 } while (0)
  34
  35 #define TEST_BIT(_name, _bit) \
  36         (_name[(_bit) / 8] & (1 << ((_bit) % 8)))
  37
  38 #ifndef __GNUC__
  39 #define __optmap_gen_type(_type, _field) -1
  40 #else
  41
  42 #define __compatible(_type, _field, _newtype) \
  43         __builtin_types_compatible_p(typeof(&(((_type *)0)->_field)), _newtype *)
  44
  45 #define __list_compatible(_type, _field, __val, __else) \
  46         __builtin_choose_expr(__compatible(_type, _field, struct ucimap_list *), __val, __else)
  47
  48 #define __int_compatible(_type, _field, __val, __else) \
  49         __builtin_choose_expr(__compatible(_type, _field, int), __val, \
  50                 __builtin_choose_expr(__compatible(_type, _field, unsigned int), __val, \
  51                         __else))
  52
  53 #define __string_compatible(_type, _field, __val, __else) \
  54         __builtin_choose_expr(__compatible(_type, _field, char *), __val, \
  55                 __builtin_choose_expr(__compatible(_type, _field, unsigned char *), __val, \
  56                         __builtin_choose_expr(__compatible(_type, _field, const char *), __val, \
  57                                 __builtin_choose_expr(__compatible(_type, _field, const unsigned char *), __val, \
  58                                         __else))))
  59
  60 #define __bool_compatible(_type, _field, __val, __else) \
  61         __builtin_choose_expr(__compatible(_type, _field, bool), __val, __else)
  62
  63
  64 #define __optmap_gen_type(_type, _field) \
  65         __list_compatible(_type, _field, UCIMAP_LIST, \
  66         __int_compatible(_type, _field, UCIMAP_INT, \
  67         __string_compatible(_type, _field, UCIMAP_STRING, \
  68         __bool_compatible(_type, _field, UCIMAP_BOOL, \
  69         -1))))
  70
  71 #endif
  72
  73 #define UCIMAP_OPTION(_type, _field) \
  74         .type = UCIMAP_CUSTOM, \
  75         .name = #_field, \
  76         .offset = offsetof(_type, _field), \
  77         .detected_type = __optmap_gen_type(_type, _field)
  78
  79
  80 #define UCIMAP_SECTION(_name, _field) \
  81         .alloc_len = sizeof(_name), \
  82         .smap_offset = offsetof(_name, _field)
  83
  84 struct uci_sectionmap;
  85 struct uci_optmap;
  86 struct ucimap_list;
  87
  88 struct uci_map {
  89         struct uci_sectionmap **sections;
  90         unsigned int n_sections;
  91         struct list_head sdata;
  92         struct list_head fixup;
  93         struct list_head pending;
  94         bool parsed;
  95
  96         void *priv; /* user data */
  97 };
  98
  99 enum ucimap_type {
 100         /* types */
 101         UCIMAP_SIMPLE   = 0x00,
 102         UCIMAP_LIST     = 0x10,
 103         UCIMAP_TYPE     = 0xf0, /* type mask */
 104
 105         /* subtypes */
 106         UCIMAP_STRING   = 0x0,
 107         UCIMAP_BOOL     = 0x1,
 108         UCIMAP_INT      = 0x2,
 109         UCIMAP_SECTION  = 0x3,
 110         UCIMAP_CUSTOM   = 0x4,
 111         UCIMAP_SUBTYPE  = 0xf, /* subtype mask */
 112
 113         /* automatically create lists from
 114          * options with space-separated items */
 115         UCIMAP_LIST_AUTO = 0x0100,
 116         UCIMAP_FLAGS     = 0xff00, /* flags mask */
 117 };
 118
 119 union ucimap_data {
 120         int i;
 121         bool b;
 122         char *s;
 123         void *ptr;
 124         struct ucimap_list *list;
 125 };
 126
 127 struct ucimap_section_data {
 128         struct list_head list;
 129         struct uci_map *map;
 130         struct uci_sectionmap *sm;
 131         const char *section_name;
 132
 133         /* list of allocations done by ucimap */
 134         struct uci_alloc *allocmap;
 135         unsigned long allocmap_len;
 136
 137         /* map for changed fields */
 138         unsigned char *cmap;
 139         bool done;
 140 };
 141
 142
 143 struct uci_listmap {
 144         struct list_head list;
 145         union ucimap_data data;
 146 };
 147
 148 struct uci_sectionmap {
 149         /* type string for the uci section */
 150         const char *type;
 151
 152         /* length of the struct to map into, filled in by macro */
 153         unsigned int alloc_len;
 154
 155         /* sectionmap offset, filled in by macro */
 156         unsigned int smap_offset;
 157
 158         /* return a pointer to the section map data (allocate if necessary) */
 159         struct ucimap_section_data *(*alloc)(struct uci_map *map,
 160                 struct uci_sectionmap *sm, struct uci_section *s);
 161
 162         /* give the caller time to initialize the preallocated struct */
 163         int (*init)(struct uci_map *map, void *section, struct uci_section *s);
 164
 165         /* pass the fully processed struct to the callback after the section end */
 166         int (*add)(struct uci_map *map, void *section);
 167
 168         /* let the callback clean up its own stuff in the section */
 169         int (*free)(struct uci_map *map, void *section);
 170
 171         /* list of option mappings for this section */
 172         struct uci_optmap *options;
 173         unsigned int n_options;
 174         unsigned int options_size;
 175 };
 176
 177 struct uci_optmap {
 178         unsigned int offset;
 179         const char *name;
 180         enum ucimap_type type;
 181         int detected_type;
 182         int (*parse)(void *section, struct uci_optmap *om, union ucimap_data *data, const char *string);
 183         int (*format)(void *section, struct uci_optmap *om, union ucimap_data *data, char **string);
 184         union {
 185                 struct {
 186                         int base;
 187                         int min;
 188                         int max;
 189                 } i;
 190                 struct {
 191                         int maxlen;
 192                 } s;
 193                 struct uci_sectionmap *sm;
 194         } data;
 195 };
 196
 197 struct ucimap_list {
 198         int n_items;
 199         union ucimap_data item[];
 200 };
 201
 202 extern int ucimap_init(struct uci_map *map);
 203 extern void ucimap_cleanup(struct uci_map *map);
 204 extern void ucimap_set_changed(struct ucimap_section_data *sd, void *field);
 205 extern int ucimap_store_section(struct uci_map *map, struct uci_package *p, struct ucimap_section_data *sd);
 206 extern void ucimap_parse(struct uci_map *map, struct uci_package *pkg);
 207 extern int ucimap_parse_section(struct uci_map *map, struct uci_sectionmap *sm, struct ucimap_section_data *sd, struct uci_section *s);
 208
 209 #endif