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
23 #define LINEBUF_MAX 4096
26 * Fetch a new line from the input stream and resize buffer if necessary
28 static void uci_getln(struct uci_context *ctx)
30 struct uci_parse_context *pctx = ctx->pctx;
34 if (pctx->buf == NULL) {
35 pctx->buf = uci_malloc(ctx, LINEBUF);
36 pctx->bufsz = LINEBUF;
44 p = fgets(p, pctx->bufsz - ofs, pctx->file);
49 if (pctx->buf[ofs - 1] == '\n') {
51 pctx->buf[ofs - 1] = 0;
55 if (pctx->bufsz > LINEBUF_MAX/2) {
56 pctx->byte = LINEBUF_MAX;
57 UCI_THROW(ctx, UCI_ERR_PARSE);
61 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
66 * Clean up all extra memory used by the parser
68 static void uci_parse_cleanup(struct uci_context *ctx)
70 struct uci_parse_context *pctx;
77 uci_list_del(&pctx->cfg->list);
78 uci_drop_file(pctx->cfg);
89 * move the string pointer forward until a non-whitespace character or
92 static void skip_whitespace(char **str)
94 while (**str && isspace(**str))
99 * parse a double quoted string argument from the command line
101 static char *parse_double_quote(char **str)
109 /* skip escaped characters */
115 /* check for the end of the quoted string */
128 * parse a single quoted string argument from the command line
130 static char *parse_single_quote(char **str)
132 /* TODO: implement */
137 * extract the next word from the command line (unquoted argument)
139 static char *parse_unquoted(char **str)
145 while (**str && !isspace(**str))
157 * extract the next argument from the command line
159 static char *next_arg(struct uci_context *ctx, char **str, bool required)
163 skip_whitespace(str);
166 val = parse_double_quote(str);
169 val = parse_single_quote(str);
175 val = parse_unquoted(str);
179 if (required && !val) {
180 ctx->pctx->byte = *str - ctx->pctx->buf;
181 UCI_THROW(ctx, UCI_ERR_PARSE);
188 * verify that the end of the line or command is reached.
189 * throw an error if extra arguments are given on the command line
191 static void assert_eol(struct uci_context *ctx, char **str)
195 tmp = next_arg(ctx, str, false);
197 ctx->pctx->byte = tmp - ctx->pctx->buf;
198 UCI_THROW(ctx, UCI_ERR_PARSE);
203 * parse the 'config' uci command (open a section)
205 static void uci_parse_config(struct uci_context *ctx, char **str)
209 *str += strlen(*str) + 1;
212 ctx->pctx->byte = *str - ctx->pctx->buf;
213 UCI_THROW(ctx, UCI_ERR_PARSE);
216 type = next_arg(ctx, str, true);
217 name = next_arg(ctx, str, false);
218 assert_eol(ctx, str);
220 DPRINTF("Section<%s>: %s\n", type, name);
224 * parse the 'option' uci command (open a value)
226 static void uci_parse_option(struct uci_context *ctx, char **str)
230 *str += strlen(*str) + 1;
232 name = next_arg(ctx, str, true);
233 value = next_arg(ctx, str, true);
234 assert_eol(ctx, str);
236 DPRINTF("\tOption: %s=\"%s\"\n", name, value);
240 * parse a complete input line, split up combined commands by ';'
242 static void uci_parse_line(struct uci_context *ctx)
244 struct uci_parse_context *pctx = ctx->pctx;
247 for (word = strtok_r(pctx->buf, ";", &brk);
249 word = strtok_r(NULL, ";", &brk)) {
252 word = strtok_r(word, " \t", &pbrk);
256 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
257 uci_parse_config(ctx, &word);
260 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
261 uci_parse_option(ctx, &word);
264 pctx->byte = word - pctx->buf;
265 UCI_THROW(ctx, UCI_ERR_PARSE);
271 int uci_load(struct uci_context *ctx, const char *name)
273 struct uci_parse_context *pctx;
278 UCI_ASSERT(ctx, name != NULL);
280 /* make sure no memory from previous parse attempts is leaked */
281 uci_parse_cleanup(ctx);
283 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
289 /* absolute/relative path outside of /etc/config */
290 filename = (char *) name;
293 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
294 sprintf(filename, UCI_CONFDIR "/%s", name);
298 if ((stat(filename, &statbuf) < 0) ||
299 ((statbuf.st_mode & S_IFMT) != S_IFREG))
300 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
302 pctx->file = fopen(filename, "r");
304 UCI_THROW(ctx, UCI_ERR_IO);
306 pctx->cfg = uci_alloc_file(ctx, name);
308 while (!feof(pctx->file)) {
314 /* add to main config file list */
315 uci_list_add(&ctx->root, &pctx->cfg->list);
318 /* if no error happened, we can get rid of the parser context now */
319 uci_parse_cleanup(ctx);