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);
62 static bool uci_validate_name(const char *str)
68 if (!isalnum(*str) && (*str != '_'))
75 static void uci_alloc_parse_context(struct uci_context *ctx)
77 ctx->pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
80 int uci_parse_tuple(struct uci_context *ctx, char *str, char **package, char **section, char **option, char **value)
85 UCI_ASSERT(ctx, str && package && section && option);
87 *package = strtok(str, ".");
88 if (!*package || !uci_validate_name(*package))
92 *section = strtok(NULL, ".");
97 *option = strtok(NULL, ".");
104 last = strchr(last, '=');
116 if (*section && !uci_validate_name(*section))
118 if (*option && !uci_validate_name(*option))
124 UCI_THROW(ctx, UCI_ERR_PARSE);
131 static void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
133 struct uci_parse_context *pctx = ctx->pctx;
135 pctx->reason = reason;
136 pctx->byte = pos - pctx->buf;
137 UCI_THROW(ctx, UCI_ERR_PARSE);
142 * Fetch a new line from the input stream and resize buffer if necessary
144 static void uci_getln(struct uci_context *ctx, int offset)
146 struct uci_parse_context *pctx = ctx->pctx;
150 if (pctx->buf == NULL) {
151 pctx->buf = uci_malloc(ctx, LINEBUF);
152 pctx->bufsz = LINEBUF;
160 p = fgets(p, pctx->bufsz - ofs, pctx->file);
165 if (pctx->buf[ofs - 1] == '\n') {
167 pctx->buf[ofs - 1] = 0;
171 if (pctx->bufsz > LINEBUF_MAX/2)
172 uci_parse_error(ctx, p, "line too long");
175 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
180 * open a stream and go to the right position
182 * note: when opening for write and seeking to the beginning of
183 * the stream, truncate the file
185 static FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create)
190 int mode = (write ? O_RDWR : O_RDONLY);
195 if (!write && ((stat(filename, &statbuf) < 0) ||
196 ((statbuf.st_mode & S_IFMT) != S_IFREG))) {
197 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
200 fd = open(filename, mode, UCI_FILEMODE);
204 if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
207 ret = lseek(fd, 0, pos);
212 file = fdopen(fd, (write ? "w+" : "r"));
217 UCI_THROW(ctx, UCI_ERR_IO);
222 static void uci_close_stream(FILE *stream)