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->byte = LINEBUF_MAX;
60 UCI_THROW(ctx, UCI_ERR_PARSE);
64 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
69 * Clean up all extra memory used by the parser
71 static void uci_parse_cleanup(struct uci_context *ctx)
73 struct uci_parse_context *pctx;
80 uci_list_del(&pctx->cfg->list);
81 uci_drop_file(pctx->cfg);
92 * move the string pointer forward until a non-whitespace character or
95 static void skip_whitespace(char **str)
97 while (**str && isspace(**str))
101 static inline void addc(char **dest, char **src)
108 static inline void parse_backslash(char **str, char **target)
112 /* FIXME: decode escaped characters? */
117 * parse a double quoted string argument from the command line
119 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
123 /* skip quote character */
126 while ((c = **str)) {
129 parse_backslash(str, target);
140 ctx->pctx->byte = *str - ctx->pctx->buf;
141 UCI_THROW(ctx, UCI_ERR_PARSE);
145 * parse a single quoted string argument from the command line
147 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
150 /* skip quote character */
153 while ((c = **str)) {
163 ctx->pctx->byte = *str - ctx->pctx->buf;
164 UCI_THROW(ctx, UCI_ERR_PARSE);
168 * parse a string from the command line and detect the quoting style
170 static void parse_str(struct uci_context *ctx, char **str, char **target)
175 parse_backslash(str, target);
178 parse_single_quote(ctx, str, target);
181 parse_double_quote(ctx, str, target);
189 } while (**str && !isspace(**str));
193 * if the string was unquoted and we've stopped at a whitespace
194 * character, skip to the next one, because the whitespace will
195 * be overwritten by a null byte here
200 /* terminate the parsed string */
205 * extract the next argument from the command line
207 static char *next_arg(struct uci_context *ctx, char **str, bool required)
213 skip_whitespace(str);
214 parse_str(ctx, str, &ptr);
215 if (required && !*val) {
216 ctx->pctx->byte = *str - ctx->pctx->buf;
217 UCI_THROW(ctx, UCI_ERR_PARSE);
220 return uci_strdup(ctx, val);
224 * verify that the end of the line or command is reached.
225 * throw an error if extra arguments are given on the command line
227 static void assert_eol(struct uci_context *ctx, char **str)
231 tmp = next_arg(ctx, str, false);
233 ctx->pctx->byte = tmp - ctx->pctx->buf;
234 UCI_THROW(ctx, UCI_ERR_PARSE);
239 * parse the 'config' uci command (open a section)
241 static void uci_parse_config(struct uci_context *ctx, char **str)
245 *str += strlen(*str) + 1;
248 ctx->pctx->byte = *str - ctx->pctx->buf;
249 UCI_THROW(ctx, UCI_ERR_PARSE);
252 type = next_arg(ctx, str, true);
253 name = next_arg(ctx, str, false);
254 assert_eol(ctx, str);
258 * parse the 'option' uci command (open a value)
260 static void uci_parse_option(struct uci_context *ctx, char **str)
264 *str += strlen(*str) + 1;
266 name = next_arg(ctx, str, true);
267 value = next_arg(ctx, str, true);
268 assert_eol(ctx, str);
270 DPRINTF("\tOption: %s=\"%s\"\n", name, value);
274 * parse a complete input line, split up combined commands by ';'
276 static void uci_parse_line(struct uci_context *ctx)
278 struct uci_parse_context *pctx = ctx->pctx;
281 for (word = strtok_r(pctx->buf, ";", &brk);
283 word = strtok_r(NULL, ";", &brk)) {
286 word = strtok_r(word, " \t", &pbrk);
290 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
291 uci_parse_config(ctx, &word);
294 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
295 uci_parse_option(ctx, &word);
298 pctx->byte = word - pctx->buf;
299 UCI_THROW(ctx, UCI_ERR_PARSE);
305 int uci_load(struct uci_context *ctx, const char *name)
307 struct uci_parse_context *pctx;
313 UCI_ASSERT(ctx, name != NULL);
315 /* make sure no memory from previous parse attempts is leaked */
316 uci_parse_cleanup(ctx);
318 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
324 /* absolute/relative path outside of /etc/config */
325 filename = (char *) name;
329 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
330 sprintf(filename, UCI_CONFDIR "/%s", name);
335 if ((stat(filename, &statbuf) < 0) ||
336 ((statbuf.st_mode & S_IFMT) != S_IFREG))
337 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
339 pctx->file = fopen(filename, "r");
340 if (filename != name)
344 UCI_THROW(ctx, UCI_ERR_IO);
346 pctx->cfg = uci_alloc_file(ctx, name);
348 while (!feof(pctx->file)) {
354 /* add to main config file list */
355 uci_list_add(&ctx->root, &pctx->cfg->list);
358 /* no error happened, we can get rid of the parser context now */
359 uci_parse_cleanup(ctx);