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 misc utility functions and wrappers to standard
17 * functions, which throw exceptions upon failure.
20 #include <sys/types.h>
32 #include "uci_internal.h"
34 __plugin void *uci_malloc(struct uci_context *ctx, size_t size)
40 UCI_THROW(ctx, UCI_ERR_MEM);
46 __plugin void *uci_realloc(struct uci_context *ctx, void *ptr, size_t size)
48 ptr = realloc(ptr, size);
50 UCI_THROW(ctx, UCI_ERR_MEM);
55 __plugin char *uci_strdup(struct uci_context *ctx, const char *str)
61 UCI_THROW(ctx, UCI_ERR_MEM);
67 * validate strings for names and types, reject special characters
68 * for names, only alphanum and _ is allowed (shell compatibility)
69 * for types, we allow more characters
71 __plugin bool uci_validate_str(const char *str, bool name)
77 unsigned char c = *str;
78 if (!isalnum(c) && c != '_') {
79 if (name || (c < 33) || (c > 126))
87 bool uci_validate_text(const char *str)
90 unsigned char c = *str;
91 if ((c == '\r') || (c == '\n') ||
92 ((c < 32) && (c != '\t')))
99 __private void uci_alloc_parse_context(struct uci_context *ctx)
101 ctx->pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
104 int uci_parse_ptr(struct uci_context *ctx, struct uci_ptr *ptr, char *str)
110 UCI_ASSERT(ctx, str);
111 UCI_ASSERT(ctx, ptr);
113 memset(ptr, 0, sizeof(struct uci_ptr));
116 last = strchr(str, '=');
123 ptr->package = strsep(&str, ".");
127 ptr->section = strsep(&str, ".");
129 ptr->target = UCI_TYPE_PACKAGE;
133 ptr->option = strsep(&str, ".");
135 ptr->target = UCI_TYPE_SECTION;
138 ptr->target = UCI_TYPE_OPTION;
141 tmp = strsep(&str, ".");
146 if (ptr->package && !uci_validate_package(ptr->package))
148 if (ptr->section && !uci_validate_name(ptr->section))
149 ptr->flags |= UCI_LOOKUP_EXTENDED;
150 if (ptr->option && !uci_validate_name(ptr->option))
152 if (ptr->value && !uci_validate_text(ptr->value))
158 memset(ptr, 0, sizeof(struct uci_ptr));
159 UCI_THROW(ctx, UCI_ERR_PARSE);
163 __private void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
165 struct uci_parse_context *pctx = ctx->pctx;
167 pctx->reason = reason;
168 pctx->byte = pos - pctx->buf;
169 UCI_THROW(ctx, UCI_ERR_PARSE);
175 * open a stream and go to the right position
177 * note: when opening for write and seeking to the beginning of
178 * the stream, truncate the file
180 __private FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create)
185 int mode = (write ? O_RDWR : O_RDONLY);
190 if (!write && ((stat(filename, &statbuf) < 0) ||
191 ((statbuf.st_mode & S_IFMT) != S_IFREG))) {
192 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
195 fd = open(filename, mode, UCI_FILEMODE);
199 ret = flock(fd, (write ? LOCK_EX : LOCK_SH));
200 if ((ret < 0) && (errno != ENOSYS))
203 ret = lseek(fd, 0, pos);
208 file = fdopen(fd, (write ? "w+" : "r"));
213 UCI_THROW(ctx, UCI_ERR_IO);
218 __private void uci_close_stream(FILE *stream)