2 * libuci - Library for the Unified Configuration Interface
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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
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.
16 * This file contains the code for parsing uci config files
22 #define LINEBUF_MAX 4096
25 * Fetch a new line from the input stream and resize buffer if necessary
27 static void uci_getln(struct uci_context
*ctx
)
29 struct uci_parse_context
*pctx
= ctx
->pctx
;
33 if (pctx
->buf
== NULL
) {
34 pctx
->buf
= uci_malloc(ctx
, LINEBUF
);
35 pctx
->bufsz
= LINEBUF
;
43 p
= fgets(p
, pctx
->bufsz
- ofs
, pctx
->file
);
48 if (pctx
->buf
[ofs
- 1] == '\n') {
50 pctx
->buf
[ofs
- 1] = 0;
54 if (pctx
->bufsz
> LINEBUF_MAX
/2) {
55 pctx
->byte
= LINEBUF_MAX
;
56 UCI_THROW(ctx
, UCI_ERR_PARSE
);
60 pctx
->buf
= uci_realloc(ctx
, pctx
->buf
, pctx
->bufsz
);
65 * Clean up all extra memory used by the parser
67 static void uci_parse_cleanup(struct uci_context
*ctx
)
69 struct uci_parse_context
*pctx
;
76 uci_list_del(&pctx
->cfg
->list
);
77 uci_drop_file(pctx
->cfg
);
88 * move the string pointer forward until a non-whitespace character or
91 static void skip_whitespace(char **str
)
93 while (**str
&& isspace(**str
))
98 * parse a double quoted string argument from the command line
100 static char *parse_double_quote(char **str
)
108 /* skip escaped characters */
114 /* check for the end of the quoted string */
127 * parse a single quoted string argument from the command line
129 static char *parse_single_quote(char **str
)
131 /* TODO: implement */
136 * extract the next word from the command line (unquoted argument)
138 static char *parse_unquoted(char **str
)
144 while (**str
&& !isspace(**str
))
156 * extract the next argument from the command line
158 static char *next_arg(struct uci_context
*ctx
, char **str
, bool required
)
162 skip_whitespace(str
);
165 val
= parse_double_quote(str
);
168 val
= parse_single_quote(str
);
174 val
= parse_unquoted(str
);
178 if (required
&& !val
) {
179 ctx
->pctx
->byte
= *str
- ctx
->pctx
->buf
;
180 UCI_THROW(ctx
, UCI_ERR_PARSE
);
187 * verify that the end of the line or command is reached.
188 * throw an error if extra arguments are given on the command line
190 static void assert_eol(struct uci_context
*ctx
, char **str
)
194 tmp
= next_arg(ctx
, str
, false);
196 ctx
->pctx
->byte
= tmp
- ctx
->pctx
->buf
;
197 UCI_THROW(ctx
, UCI_ERR_PARSE
);
202 * parse the 'config' uci command (open a section)
204 static void uci_parse_config(struct uci_context
*ctx
, char **str
)
208 *str
+= strlen(*str
) + 1;
211 ctx
->pctx
->byte
= *str
- ctx
->pctx
->buf
;
212 UCI_THROW(ctx
, UCI_ERR_PARSE
);
215 type
= next_arg(ctx
, str
, true);
216 name
= next_arg(ctx
, str
, false);
217 assert_eol(ctx
, str
);
219 DPRINTF("Section<%s>: %s\n", type
, name
);
223 * parse the 'option' uci command (open a value)
225 static void uci_parse_option(struct uci_context
*ctx
, char **str
)
229 *str
+= strlen(*str
) + 1;
231 name
= next_arg(ctx
, str
, true);
232 value
= next_arg(ctx
, str
, true);
233 assert_eol(ctx
, str
);
235 DPRINTF("\tOption: %s=\"%s\"\n", name
, value
);
239 * parse a complete input line, split up combined commands by ';'
241 static void uci_parse_line(struct uci_context
*ctx
)
243 struct uci_parse_context
*pctx
= ctx
->pctx
;
246 for (word
= strtok_r(pctx
->buf
, ";", &brk
);
248 word
= strtok_r(NULL
, ";", &brk
)) {
251 word
= strtok_r(word
, " \t", &pbrk
);
255 if ((word
[1] == 0) || !strcmp(word
+ 1, "onfig"))
256 uci_parse_config(ctx
, &word
);
259 if ((word
[1] == 0) || !strcmp(word
+ 1, "ption"))
260 uci_parse_option(ctx
, &word
);
263 pctx
->byte
= word
- pctx
->buf
;
264 UCI_THROW(ctx
, UCI_ERR_PARSE
);
270 int uci_parse(struct uci_context
*ctx
, const char *name
)
272 struct uci_parse_context
*pctx
;
275 UCI_ASSERT(ctx
, name
!= NULL
);
277 /* make sure no memory from previous parse attempts is leaked */
278 uci_parse_cleanup(ctx
);
280 pctx
= (struct uci_parse_context
*) uci_malloc(ctx
, sizeof(struct uci_parse_context
));
283 /* TODO: use /etc/config/ */
284 pctx
->file
= fopen(name
, "r");
286 UCI_THROW(ctx
, UCI_ERR_NOTFOUND
);
288 pctx
->cfg
= uci_alloc_file(ctx
, name
);
290 while (!feof(pctx
->file
)) {
296 /* add to main config file list */
297 uci_list_add(&ctx
->root
, &pctx
->cfg
->list
);
300 /* if no error happened, we can get rid of the parser context now */
301 uci_parse_cleanup(ctx
);