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 wrappers to standard functions, which
17 * throw exceptions upon failure.
19 #include <sys/types.h>
28 #define LINEBUF_MAX 4096
30 static void *uci_malloc(struct uci_context
*ctx
, size_t size
)
36 UCI_THROW(ctx
, UCI_ERR_MEM
);
42 static void *uci_realloc(struct uci_context
*ctx
, void *ptr
, size_t size
)
44 ptr
= realloc(ptr
, size
);
46 UCI_THROW(ctx
, UCI_ERR_MEM
);
51 static char *uci_strdup(struct uci_context
*ctx
, const char *str
)
57 UCI_THROW(ctx
, UCI_ERR_MEM
);
63 * validate strings for names and types, reject special characters
64 * for names, only alphanum and _ is allowed (shell compatibility)
65 * for types, we allow more characters
67 static bool uci_validate_str(const char *str
, bool name
)
74 if (!isalnum(c
) && c
!= '_') {
75 if (name
|| (c
< 33) || (c
> 126))
83 static inline bool uci_validate_name(const char *str
)
85 return uci_validate_str(str
, true);
88 static void uci_alloc_parse_context(struct uci_context
*ctx
)
90 ctx
->pctx
= (struct uci_parse_context
*) uci_malloc(ctx
, sizeof(struct uci_parse_context
));
93 int uci_parse_tuple(struct uci_context
*ctx
, char *str
, char **package
, char **section
, char **option
, char **value
)
98 UCI_ASSERT(ctx
, str
&& package
&& section
&& option
);
100 *package
= strtok(str
, ".");
101 if (!*package
|| !uci_validate_name(*package
))
105 *section
= strtok(NULL
, ".");
110 *option
= strtok(NULL
, ".");
117 last
= strchr(last
, '=');
129 if (*section
&& !uci_validate_name(*section
))
131 if (*option
&& !uci_validate_name(*option
))
137 UCI_THROW(ctx
, UCI_ERR_PARSE
);
144 static void uci_parse_error(struct uci_context
*ctx
, char *pos
, char *reason
)
146 struct uci_parse_context
*pctx
= ctx
->pctx
;
148 pctx
->reason
= reason
;
149 pctx
->byte
= pos
- pctx
->buf
;
150 UCI_THROW(ctx
, UCI_ERR_PARSE
);
155 * Fetch a new line from the input stream and resize buffer if necessary
157 static void uci_getln(struct uci_context
*ctx
, int offset
)
159 struct uci_parse_context
*pctx
= ctx
->pctx
;
163 if (pctx
->buf
== NULL
) {
164 pctx
->buf
= uci_malloc(ctx
, LINEBUF
);
165 pctx
->bufsz
= LINEBUF
;
173 p
= fgets(p
, pctx
->bufsz
- ofs
, pctx
->file
);
178 if (pctx
->buf
[ofs
- 1] == '\n') {
180 pctx
->buf
[ofs
- 1] = 0;
184 if (pctx
->bufsz
> LINEBUF_MAX
/2)
185 uci_parse_error(ctx
, p
, "line too long");
188 pctx
->buf
= uci_realloc(ctx
, pctx
->buf
, pctx
->bufsz
);
193 * open a stream and go to the right position
195 * note: when opening for write and seeking to the beginning of
196 * the stream, truncate the file
198 static FILE *uci_open_stream(struct uci_context
*ctx
, const char *filename
, int pos
, bool write
, bool create
)
203 int mode
= (write
? O_RDWR
: O_RDONLY
);
208 if (!write
&& ((stat(filename
, &statbuf
) < 0) ||
209 ((statbuf
.st_mode
& S_IFMT
) != S_IFREG
))) {
210 UCI_THROW(ctx
, UCI_ERR_NOTFOUND
);
213 fd
= open(filename
, mode
, UCI_FILEMODE
);
217 if (flock(fd
, (write
? LOCK_EX
: LOCK_SH
)) < 0)
220 ret
= lseek(fd
, 0, pos
);
225 file
= fdopen(fd
, (write
? "w+" : "r"));
230 UCI_THROW(ctx
, UCI_ERR_IO
);
235 static void uci_close_stream(FILE *stream
)