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 Lesser General Public License for more details.
16 * This file contains misc utility functions and wrappers to standard
17 * functions, which throw exceptions upon failure.
20 #include <sys/types.h>
33 #include "uci_internal.h"
35 __private void *uci_malloc(struct uci_context *ctx, size_t size)
41 UCI_THROW(ctx, UCI_ERR_MEM);
47 __private void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
49 ptr = realloc(ptr, size);
51 UCI_THROW(ctx, UCI_ERR_MEM);
56 __private char *uci_strdup(struct uci_context *ctx, const char *str)
62 UCI_THROW(ctx, UCI_ERR_MEM);
68 * validate strings for names and types, reject special characters
69 * for names, only alphanum and _ is allowed (shell compatibility)
70 * for types, we allow more characters
72 __private bool uci_validate_str(const char *str, bool name)
78 unsigned char c = *str;
79 if (!isalnum(c) && c != '_') {
80 if (name || (c < 33) || (c > 126))
88 bool uci_validate_text(const char *str)
91 unsigned char c = *str;
92 if ((c == '\r') || (c == '\n') ||
93 ((c < 32) && (c != '\t')))
100 __private void uci_alloc_parse_context(struct uci_context *ctx)
102 ctx->pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
105 int uci_parse_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str)
111 UCI_ASSERT(ctx, str);
112 UCI_ASSERT(ctx, ptr);
114 memset(ptr, 0, sizeof(struct uci_ptr));
117 last = strchr(str, '=');
124 ptr->package = strsep(&str, ".");
128 ptr->section = strsep(&str, ".");
130 ptr->target = UCI_TYPE_PACKAGE;
134 ptr->option = strsep(&str, ".");
136 ptr->target = UCI_TYPE_SECTION;
139 ptr->target = UCI_TYPE_OPTION;
142 tmp = strsep(&str, ".");
147 if (ptr->package && !uci_validate_package(ptr->package))
149 if (ptr->section && !uci_validate_name(ptr->section))
150 ptr->flags |= UCI_LOOKUP_EXTENDED;
151 if (ptr->option && !uci_validate_name(ptr->option))
153 if (ptr->value && !uci_validate_text(ptr->value))
159 memset(ptr, 0, sizeof(struct uci_ptr));
160 UCI_THROW(ctx, UCI_ERR_PARSE);
164 __private void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
166 struct uci_parse_context *pctx = ctx->pctx;
168 pctx->reason = reason;
169 pctx->byte = pos - pctx->buf;
170 UCI_THROW(ctx, UCI_ERR_PARSE);
176 * open a stream and go to the right position
178 * note: when opening for write and seeking to the beginning of
179 * the stream, truncate the file
181 __private FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create)
186 int flags = (write ? O_RDWR : O_RDONLY);
187 mode_t mode = UCI_FILEMODE;
189 char *filename2 = NULL;
193 name = basename((char *) filename);
194 if ((asprintf(&filename2, "%s/%s", ctx->confdir, name) < 0) || !filename2) {
195 UCI_THROW(ctx, UCI_ERR_MEM);
197 if (stat(filename2, &statbuf) == 0)
198 mode = statbuf.st_mode;
204 if (!write && ((stat(filename, &statbuf) < 0) ||
205 ((statbuf.st_mode & S_IFMT) != S_IFREG))) {
206 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
209 fd = open(filename, flags, mode);
213 ret = flock(fd, (write ? LOCK_EX : LOCK_SH));
214 if ((ret < 0) && (errno != ENOSYS))
217 ret = lseek(fd, 0, pos);
222 file = fdopen(fd, (write ? "w+" : "r"));
227 UCI_THROW(ctx, UCI_ERR_IO);
232 __private void uci_close_stream(FILE *stream)