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
19 #include <sys/types.h>
26 #define LINEBUF_MAX 4096
29 * Fetch a new line from the input stream and resize buffer if necessary
31 static void uci_getln(struct uci_context
*ctx
)
33 struct uci_parse_context
*pctx
= ctx
->pctx
;
37 if (pctx
->buf
== NULL
) {
38 pctx
->buf
= uci_malloc(ctx
, LINEBUF
);
39 pctx
->bufsz
= LINEBUF
;
47 p
= fgets(p
, pctx
->bufsz
- ofs
, pctx
->file
);
52 if (pctx
->buf
[ofs
- 1] == '\n') {
54 pctx
->buf
[ofs
- 1] = 0;
58 if (pctx
->bufsz
> LINEBUF_MAX
/2) {
59 pctx
->reason
= "line too long";
60 pctx
->byte
= LINEBUF_MAX
;
61 UCI_THROW(ctx
, UCI_ERR_PARSE
);
65 pctx
->buf
= uci_realloc(ctx
, pctx
->buf
, pctx
->bufsz
);
70 * Clean up all extra memory used by the parser
72 static void uci_parse_cleanup(struct uci_context
*ctx
)
74 struct uci_parse_context
*pctx
;
82 uci_list_del(&pctx
->cfg
->list
);
83 uci_drop_config(pctx
->cfg
);
94 * move the string pointer forward until a non-whitespace character or
97 static void skip_whitespace(char **str
)
99 while (**str
&& isspace(**str
))
103 static inline void addc(char **dest
, char **src
)
110 static inline void parse_backslash(char **str
, char **target
)
114 /* FIXME: decode escaped characters? */
119 * parse a double quoted string argument from the command line
121 static void parse_double_quote(struct uci_context
*ctx
, char **str
, char **target
)
125 /* skip quote character */
128 while ((c
= **str
)) {
131 parse_backslash(str
, target
);
142 ctx
->pctx
->reason
= "unterminated \"";
143 ctx
->pctx
->byte
= *str
- ctx
->pctx
->buf
;
144 UCI_THROW(ctx
, UCI_ERR_PARSE
);
148 * parse a single quoted string argument from the command line
150 static void parse_single_quote(struct uci_context
*ctx
, char **str
, char **target
)
153 /* skip quote character */
156 while ((c
= **str
)) {
166 ctx
->pctx
->reason
= "unterminated '";
167 ctx
->pctx
->byte
= *str
- ctx
->pctx
->buf
;
168 UCI_THROW(ctx
, UCI_ERR_PARSE
);
172 * parse a string from the command line and detect the quoting style
174 static void parse_str(struct uci_context
*ctx
, char **str
, char **target
)
179 parse_backslash(str
, target
);
182 parse_single_quote(ctx
, str
, target
);
185 parse_double_quote(ctx
, str
, target
);
193 } while (**str
&& !isspace(**str
));
197 * if the string was unquoted and we've stopped at a whitespace
198 * character, skip to the next one, because the whitespace will
199 * be overwritten by a null byte here
204 /* terminate the parsed string */
209 * extract the next argument from the command line
211 static char *next_arg(struct uci_context
*ctx
, char **str
, bool required
)
217 skip_whitespace(str
);
218 parse_str(ctx
, str
, &ptr
);
219 if (required
&& !*val
) {
220 ctx
->pctx
->reason
= "insufficient arguments";
221 ctx
->pctx
->byte
= *str
- ctx
->pctx
->buf
;
222 UCI_THROW(ctx
, UCI_ERR_PARSE
);
225 return uci_strdup(ctx
, val
);
229 * verify that the end of the line or command is reached.
230 * throw an error if extra arguments are given on the command line
232 static void assert_eol(struct uci_context
*ctx
, char **str
)
236 tmp
= next_arg(ctx
, str
, false);
238 ctx
->pctx
->reason
= "too many arguments";
239 ctx
->pctx
->byte
= tmp
- ctx
->pctx
->buf
;
240 UCI_THROW(ctx
, UCI_ERR_PARSE
);
245 * parse the 'config' uci command (open a section)
247 static void uci_parse_config(struct uci_context
*ctx
, char **str
)
251 /* command string null-terminated by strtok */
252 *str
+= strlen(*str
) + 1;
254 type
= next_arg(ctx
, str
, true);
255 name
= next_arg(ctx
, str
, false);
256 assert_eol(ctx
, str
);
260 * parse the 'option' uci command (open a value)
262 static void uci_parse_option(struct uci_context
*ctx
, char **str
)
266 /* command string null-terminated by strtok */
267 *str
+= strlen(*str
) + 1;
269 name
= next_arg(ctx
, str
, true);
270 value
= next_arg(ctx
, str
, true);
271 assert_eol(ctx
, str
);
275 * parse a complete input line, split up combined commands by ';'
277 static void uci_parse_line(struct uci_context
*ctx
)
279 struct uci_parse_context
*pctx
= ctx
->pctx
;
282 for (word
= strtok_r(pctx
->buf
, ";", &brk
);
284 word
= strtok_r(NULL
, ";", &brk
)) {
287 word
= strtok_r(word
, " \t", &pbrk
);
291 if ((word
[1] == 0) || !strcmp(word
+ 1, "onfig"))
292 uci_parse_config(ctx
, &word
);
295 if ((word
[1] == 0) || !strcmp(word
+ 1, "ption"))
296 uci_parse_option(ctx
, &word
);
299 pctx
->reason
= "unterminated command";
300 pctx
->byte
= word
- pctx
->buf
;
301 UCI_THROW(ctx
, UCI_ERR_PARSE
);
307 int uci_load(struct uci_context
*ctx
, const char *name
, struct uci_config
**cfg
)
309 struct uci_parse_context
*pctx
;
315 UCI_ASSERT(ctx
, name
!= NULL
);
317 UCI_TRAP_SAVE(ctx
, ignore
);
318 uci_unload(ctx
, name
);
319 UCI_TRAP_RESTORE(ctx
);
322 /* make sure no memory from previous parse attempts is leaked */
323 uci_parse_cleanup(ctx
);
325 pctx
= (struct uci_parse_context
*) uci_malloc(ctx
, sizeof(struct uci_parse_context
));
331 /* absolute/relative path outside of /etc/config */
332 filename
= (char *) name
;
336 filename
= uci_malloc(ctx
, strlen(name
) + sizeof(UCI_CONFDIR
) + 2);
337 sprintf(filename
, UCI_CONFDIR
"/%s", name
);
342 if ((stat(filename
, &statbuf
) < 0) ||
343 ((statbuf
.st_mode
& S_IFMT
) != S_IFREG
))
344 UCI_THROW(ctx
, UCI_ERR_NOTFOUND
);
346 pctx
->file
= fopen(filename
, "r");
347 if (filename
!= name
)
351 UCI_THROW(ctx
, UCI_ERR_IO
);
353 pctx
->cfg
= uci_alloc_config(ctx
, name
);
355 while (!feof(pctx
->file
)) {
361 /* add to main config file list */
362 uci_list_add(&ctx
->root
, &pctx
->cfg
->list
);
368 /* no error happened, we can get rid of the parser context now */
369 uci_parse_cleanup(ctx
);