357b2e407efd3f49af1d5495841c6677a3513fc5
[project/uci.git] / 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_add(struct uci_list *prev, struct uci_list *next, struct uci_list *ptr)
26 {
27 next->prev = ptr;
28 ptr->prev = prev;
29 ptr->next = next;
30 prev->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_add(head->prev, head, 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, 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->name = (char *) ptr + size;
62 strcpy(e->name, name);
63 uci_list_init(&e->list);
64
65 return e;
66 }
67
68 static void
69 uci_free_element(struct uci_element *e)
70 {
71 if (!e)
72 return;
73
74 if (!uci_list_empty(&e->list))
75 uci_list_del(&e->list);
76 free(e);
77 }
78
79 static struct uci_option *
80 uci_alloc_option(struct uci_section *s, const char *name, const char *value)
81 {
82 struct uci_package *p = s->package;
83 struct uci_context *ctx = p->ctx;
84 struct uci_option *o;
85
86 o = uci_alloc_element(ctx, option, name, strlen(value) + 1);
87 o->value = uci_dataptr(o);
88 o->section = s;
89 strcpy(o->value, value);
90 uci_list_add(&s->options, &o->e.list);
91
92 return o;
93 }
94
95 static inline void
96 uci_free_option(struct uci_option *o)
97 {
98 uci_free_element(&o->e);
99 }
100
101 static struct uci_section *
102 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
103 {
104 struct uci_context *ctx = p->ctx;
105 struct uci_section *s;
106 char buf[16];
107
108 if (!name || !name[0]) {
109 snprintf(buf, 16, "cfg%d", p->n_section);
110 name = buf;
111 }
112
113 s = uci_alloc_element(ctx, section, name, strlen(type) + 1);
114 s->type = uci_dataptr(s);
115 s->package = p;
116 strcpy(s->type, type);
117 uci_list_init(&s->options);
118 uci_list_add(&p->sections, &s->e.list);
119
120 return s;
121 }
122
123 static void
124 uci_free_section(struct uci_section *s)
125 {
126 struct uci_element *o, *tmp;
127
128 uci_foreach_element_safe(&s->options, tmp, o) {
129 uci_free_option(uci_to_option(o));
130 }
131 uci_free_element(&s->e);
132 }
133
134 static struct uci_package *
135 uci_alloc_package(struct uci_context *ctx, const char *name)
136 {
137 struct uci_package *p;
138
139 p = uci_alloc_element(ctx, package, name, 0);
140 p->ctx = ctx;
141 uci_list_init(&p->sections);
142 return p;
143 }
144
145 static void
146 uci_free_package(struct uci_package *p)
147 {
148 struct uci_element *e, *tmp;
149
150 if(!p)
151 return;
152
153 uci_foreach_element_safe(&p->sections, tmp, e) {
154 uci_free_section(uci_to_section(e));
155 }
156 uci_free_element(&p->e);
157 }
158
159
160 int uci_unload(struct uci_context *ctx, const char *name)
161 {
162 struct uci_element *e;
163
164 UCI_HANDLE_ERR(ctx);
165 UCI_ASSERT(ctx, name != NULL);
166
167 uci_foreach_element(&ctx->root, e) {
168 if (!strcmp(e->name, name))
169 goto found;
170 }
171 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
172
173 found:
174 uci_free_package(uci_to_package(e));
175
176 return 0;
177 }
178
179 static inline char *get_filename(char *path)
180 {
181 char *p;
182
183 p = strrchr(path, '/');
184 p++;
185 if (!*p)
186 return NULL;
187 return p;
188 }
189
190 char **uci_list_configs(struct uci_context *ctx)
191 {
192 char **configs;
193 glob_t globbuf;
194 int size, i;
195 char *buf;
196
197 if (glob(UCI_CONFDIR "/*", GLOB_MARK, NULL, &globbuf) != 0)
198 return NULL;
199
200 size = sizeof(char *) * (globbuf.gl_pathc + 1);
201 for(i = 0; i < globbuf.gl_pathc; i++) {
202 char *p;
203
204 p = get_filename(globbuf.gl_pathv[i]);
205 if (!p)
206 continue;
207
208 size += strlen(p) + 1;
209 }
210
211 configs = malloc(size);
212 if (!configs)
213 return NULL;
214
215 memset(configs, 0, size);
216 buf = (char *) &configs[globbuf.gl_pathc + 1];
217 for(i = 0; i < globbuf.gl_pathc; i++) {
218 char *p;
219
220 p = get_filename(globbuf.gl_pathv[i]);
221 if (!p)
222 continue;
223
224 configs[i] = buf;
225 strcpy(buf, p);
226 buf += strlen(buf) + 1;
227 }
228 return configs;
229 }
230
231