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;
81 uci_list_del(&pctx->cfg->list);
82 uci_drop_file(pctx->cfg);
93 * move the string pointer forward until a non-whitespace character or
96 static void skip_whitespace(char **str)
98 while (**str && isspace(**str))
102 static inline void addc(char **dest, char **src)
109 static inline void parse_backslash(char **str, char **target)
113 /* FIXME: decode escaped characters? */
118 * parse a double quoted string argument from the command line
120 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
124 /* skip quote character */
127 while ((c = **str)) {
130 parse_backslash(str, target);
141 ctx->pctx->reason = "unterminated \"";
142 ctx->pctx->byte = *str - ctx->pctx->buf;
143 UCI_THROW(ctx, UCI_ERR_PARSE);
147 * parse a single quoted string argument from the command line
149 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
152 /* skip quote character */
155 while ((c = **str)) {
165 ctx->pctx->reason = "unterminated '";
166 ctx->pctx->byte = *str - ctx->pctx->buf;
167 UCI_THROW(ctx, UCI_ERR_PARSE);
171 * parse a string from the command line and detect the quoting style
173 static void parse_str(struct uci_context *ctx, char **str, char **target)
178 parse_backslash(str, target);
181 parse_single_quote(ctx, str, target);
184 parse_double_quote(ctx, str, target);
192 } while (**str && !isspace(**str));
196 * if the string was unquoted and we've stopped at a whitespace
197 * character, skip to the next one, because the whitespace will
198 * be overwritten by a null byte here
203 /* terminate the parsed string */
208 * extract the next argument from the command line
210 static char *next_arg(struct uci_context *ctx, char **str, bool required)
216 skip_whitespace(str);
217 parse_str(ctx, str, &ptr);
218 if (required && !*val) {
219 ctx->pctx->reason = "insufficient arguments";
220 ctx->pctx->byte = *str - ctx->pctx->buf;
221 UCI_THROW(ctx, UCI_ERR_PARSE);
224 return uci_strdup(ctx, val);
228 * verify that the end of the line or command is reached.
229 * throw an error if extra arguments are given on the command line
231 static void assert_eol(struct uci_context *ctx, char **str)
235 tmp = next_arg(ctx, str, false);
237 ctx->pctx->reason = "too many arguments";
238 ctx->pctx->byte = tmp - ctx->pctx->buf;
239 UCI_THROW(ctx, UCI_ERR_PARSE);
244 * parse the 'config' uci command (open a section)
246 static void uci_parse_config(struct uci_context *ctx, char **str)
250 /* command string null-terminated by strtok */
251 *str += strlen(*str) + 1;
253 type = next_arg(ctx, str, true);
254 name = next_arg(ctx, str, false);
255 assert_eol(ctx, str);
257 DPRINTF("Section<%s>: %s\n", type, name);
261 * parse the 'option' uci command (open a value)
263 static void uci_parse_option(struct uci_context *ctx, char **str)
267 /* command string null-terminated by strtok */
268 *str += strlen(*str) + 1;
270 name = next_arg(ctx, str, true);
271 value = next_arg(ctx, str, true);
272 assert_eol(ctx, str);
274 DPRINTF("\tOption: %s=\"%s\"\n", name, value);
278 * parse a complete input line, split up combined commands by ';'
280 static void uci_parse_line(struct uci_context *ctx)
282 struct uci_parse_context *pctx = ctx->pctx;
285 for (word = strtok_r(pctx->buf, ";", &brk);
287 word = strtok_r(NULL, ";", &brk)) {
290 word = strtok_r(word, " \t", &pbrk);
294 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
295 uci_parse_config(ctx, &word);
298 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
299 uci_parse_option(ctx, &word);
302 pctx->reason = "unterminated command";
303 pctx->byte = word - pctx->buf;
304 UCI_THROW(ctx, UCI_ERR_PARSE);
310 int uci_load(struct uci_context *ctx, const char *name)
312 struct uci_parse_context *pctx;
318 UCI_ASSERT(ctx, name != NULL);
320 /* make sure no memory from previous parse attempts is leaked */
321 uci_parse_cleanup(ctx);
323 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
329 /* absolute/relative path outside of /etc/config */
330 filename = (char *) name;
334 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
335 sprintf(filename, UCI_CONFDIR "/%s", name);
340 if ((stat(filename, &statbuf) < 0) ||
341 ((statbuf.st_mode & S_IFMT) != S_IFREG))
342 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
344 pctx->file = fopen(filename, "r");
345 if (filename != name)
349 UCI_THROW(ctx, UCI_ERR_IO);
351 pctx->cfg = uci_alloc_file(ctx, name);
353 while (!feof(pctx->file)) {
359 /* add to main config file list */
360 uci_list_add(&ctx->root, &pctx->cfg->list);
363 /* no error happened, we can get rid of the parser context now */
364 uci_parse_cleanup(ctx);