add list support
[project/uci.git] / libuci.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 /*
16 * This file contains some common code for the uci library
17 */
18
19 #define _GNU_SOURCE
20 #include <sys/types.h>
21 #include <stdbool.h>
22 #include <string.h>
23 #include <stdlib.h>
24 #include <stdio.h>
25 #include "uci.h"
26
27 static const char *uci_confdir = UCI_CONFDIR;
28 static const char *uci_savedir = UCI_SAVEDIR;
29
30 static const char *uci_errstr[] = {
31 [UCI_OK] = "Success",
32 [UCI_ERR_MEM] = "Out of memory",
33 [UCI_ERR_INVAL] = "Invalid argument",
34 [UCI_ERR_NOTFOUND] = "Entry not found",
35 [UCI_ERR_IO] = "I/O error",
36 [UCI_ERR_PARSE] = "Parse error",
37 [UCI_ERR_DUPLICATE] = "Duplicate entry",
38 [UCI_ERR_UNKNOWN] = "Unknown error",
39 };
40
41 static void uci_cleanup(struct uci_context *ctx);
42
43 #include "uci_internal.h"
44 #include "util.c"
45 #include "list.c"
46 #include "history.c"
47 #include "file.c"
48
49 /* exported functions */
50 struct uci_context *uci_alloc_context(void)
51 {
52 struct uci_context *ctx;
53
54 ctx = (struct uci_context *) malloc(sizeof(struct uci_context));
55 memset(ctx, 0, sizeof(struct uci_context));
56 uci_list_init(&ctx->root);
57 uci_list_init(&ctx->history_path);
58 uci_list_init(&ctx->backends);
59 ctx->flags = UCI_FLAG_STRICT | UCI_FLAG_SAVED_HISTORY;
60
61 ctx->confdir = (char *) uci_confdir;
62 ctx->savedir = (char *) uci_savedir;
63
64 uci_list_add(&ctx->backends, &uci_file_backend.e.list);
65 ctx->backend = &uci_file_backend;
66
67 return ctx;
68 }
69
70 void uci_free_context(struct uci_context *ctx)
71 {
72 struct uci_element *e, *tmp;
73
74 if (ctx->confdir != uci_confdir)
75 free(ctx->confdir);
76 if (ctx->savedir != uci_savedir)
77 free(ctx->savedir);
78
79 uci_cleanup(ctx);
80 UCI_TRAP_SAVE(ctx, ignore);
81 uci_foreach_element_safe(&ctx->root, tmp, e) {
82 struct uci_package *p = uci_to_package(e);
83 uci_free_package(&p);
84 }
85 uci_foreach_element_safe(&ctx->history_path, tmp, e) {
86 uci_free_element(e);
87 }
88 free(ctx);
89 UCI_TRAP_RESTORE(ctx);
90
91 ignore:
92 return;
93 }
94
95 int uci_set_confdir(struct uci_context *ctx, const char *dir)
96 {
97 char *cdir;
98
99 UCI_HANDLE_ERR(ctx);
100 UCI_ASSERT(ctx, dir != NULL);
101
102 cdir = uci_strdup(ctx, dir);
103 if (ctx->confdir != uci_confdir)
104 free(ctx->confdir);
105 ctx->confdir = cdir;
106 return 0;
107 }
108
109 static void uci_cleanup(struct uci_context *ctx)
110 {
111 struct uci_parse_context *pctx;
112
113 if (ctx->buf) {
114 free(ctx->buf);
115 ctx->buf = NULL;
116 ctx->bufsz = 0;
117 }
118
119 pctx = ctx->pctx;
120 if (!pctx)
121 return;
122
123 ctx->pctx = NULL;
124 if (pctx->package)
125 uci_free_package(&pctx->package);
126
127 if (pctx->buf)
128 free(pctx->buf);
129
130 free(pctx);
131 }
132
133 void uci_perror(struct uci_context *ctx, const char *prefix)
134 {
135 int err;
136
137 if (!ctx)
138 err = UCI_ERR_INVAL;
139 else
140 err = ctx->err;
141
142 if ((err < 0) || (err >= UCI_ERR_LAST))
143 err = UCI_ERR_UNKNOWN;
144
145 if (prefix)
146 fprintf(stderr, "%s: ", prefix);
147 if (ctx->func)
148 fprintf(stderr, "%s: ", ctx->func);
149
150 switch (err) {
151 case UCI_ERR_PARSE:
152 if (ctx->pctx) {
153 fprintf(stderr, "%s (%s) at line %d, byte %d\n", uci_errstr[err], (ctx->pctx->reason ? ctx->pctx->reason : "unknown"), ctx->pctx->line, ctx->pctx->byte);
154 break;
155 }
156 /* fall through */
157 default:
158 fprintf(stderr, "%s\n", uci_errstr[err]);
159 break;
160 }
161 }
162
163 int uci_list_configs(struct uci_context *ctx, char ***list)
164 {
165 UCI_HANDLE_ERR(ctx);
166 UCI_ASSERT(ctx, list != NULL);
167 UCI_ASSERT(ctx, ctx->backend && ctx->backend->list_configs);
168 *list = ctx->backend->list_configs(ctx);
169 return 0;
170 }
171
172 int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
173 {
174 struct uci_package *p;
175 UCI_HANDLE_ERR(ctx);
176 UCI_ASSERT(ctx, package != NULL);
177 p = *package;
178 UCI_ASSERT(ctx, p != NULL);
179 UCI_ASSERT(ctx, p->backend && p->backend->commit);
180 p->backend->commit(ctx, package, overwrite);
181 return 0;
182 }
183
184 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
185 {
186 struct uci_package *p;
187 UCI_HANDLE_ERR(ctx);
188 UCI_ASSERT(ctx, ctx->backend && ctx->backend->load);
189 p = ctx->backend->load(ctx, name);
190 if (package)
191 *package = p;
192
193 return 0;
194 }
195
196 #ifdef UCI_PLUGIN_SUPPORT
197
198 __plugin int uci_add_backend(struct uci_context *ctx, struct uci_backend *b)
199 {
200 struct uci_element *e;
201 UCI_HANDLE_ERR(ctx);
202
203 e = uci_lookup_list(&ctx->backends, b->e.name);
204 if (e)
205 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
206
207 e = uci_malloc(ctx, sizeof(struct uci_backend));
208 memcpy(e, b, sizeof(struct uci_backend));
209
210 uci_list_add(&ctx->backends, &e->list);
211 return 0;
212 }
213
214 __plugin int uci_del_backend(struct uci_context *ctx, struct uci_backend *b)
215 {
216 struct uci_element *e, *tmp;
217
218 UCI_HANDLE_ERR(ctx);
219
220 e = uci_lookup_list(&ctx->backends, b->e.name);
221 if (!e || uci_to_backend(e)->ptr != b->ptr)
222 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
223 b = uci_to_backend(e);
224
225 if (ctx->backend && ctx->backend->ptr == b->ptr)
226 ctx->backend = &uci_file_backend;
227
228 uci_foreach_element_safe(&ctx->root, tmp, e) {
229 struct uci_package *p = uci_to_package(e);
230
231 if (!p->backend)
232 continue;
233
234 if (p->backend->ptr == b->ptr)
235 UCI_INTERNAL(uci_unload, ctx, p);
236 }
237
238 uci_list_del(&b->e.list);
239 free(b);
240
241 return 0;
242 }
243
244 #endif
245
246 int uci_set_backend(struct uci_context *ctx, const char *name)
247 {
248 struct uci_element *e;
249
250 UCI_HANDLE_ERR(ctx);
251 UCI_ASSERT(ctx, name != NULL);
252 e = uci_lookup_list(&ctx->backends, name);
253 if (!e)
254 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
255 ctx->backend = uci_to_backend(e);
256 return 0;
257 }