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-rw-r--r--src/config/ConfigFile.cxx269
1 files changed, 269 insertions, 0 deletions
diff --git a/src/config/ConfigFile.cxx b/src/config/ConfigFile.cxx
new file mode 100644
index 000000000..1329c4cd4
--- /dev/null
+++ b/src/config/ConfigFile.cxx
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "ConfigFile.hxx"
+#include "ConfigData.hxx"
+#include "ConfigTemplates.hxx"
+#include "util/Tokenizer.hxx"
+#include "util/StringUtil.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "fs/Limits.hxx"
+#include "fs/Path.hxx"
+#include "fs/FileSystem.hxx"
+#include "Log.hxx"
+
+#include <assert.h>
+#include <stdio.h>
+
+#define MAX_STRING_SIZE MPD_PATH_MAX+80
+
+#define CONF_COMMENT '#'
+
+static constexpr Domain config_file_domain("config_file");
+
+static bool
+config_read_name_value(struct config_param *param, char *input, unsigned line,
+ Error &error)
+{
+ Tokenizer tokenizer(input);
+
+ const char *name = tokenizer.NextWord(error);
+ if (name == nullptr) {
+ assert(!tokenizer.IsEnd());
+ return false;
+ }
+
+ const char *value = tokenizer.NextString(error);
+ if (value == nullptr) {
+ if (tokenizer.IsEnd()) {
+ error.Set(config_file_domain, "Value missing");
+ } else {
+ assert(error.IsDefined());
+ }
+
+ return false;
+ }
+
+ if (!tokenizer.IsEnd() && tokenizer.CurrentChar() != CONF_COMMENT) {
+ error.Set(config_file_domain, "Unknown tokens after value");
+ return false;
+ }
+
+ const struct block_param *bp = param->GetBlockParam(name);
+ if (bp != nullptr) {
+ error.Format(config_file_domain,
+ "\"%s\" is duplicate, first defined on line %i",
+ name, bp->line);
+ return false;
+ }
+
+ param->AddBlockParam(name, value, line);
+ return true;
+}
+
+static struct config_param *
+config_read_block(FILE *fp, int *count, char *string, Error &error)
+{
+ struct config_param *ret = new config_param(*count);
+
+ while (true) {
+ char *line;
+
+ line = fgets(string, MAX_STRING_SIZE, fp);
+ if (line == nullptr) {
+ delete ret;
+ error.Set(config_file_domain,
+ "Expected '}' before end-of-file");
+ return nullptr;
+ }
+
+ (*count)++;
+ line = StripLeft(line);
+ if (*line == 0 || *line == CONF_COMMENT)
+ continue;
+
+ if (*line == '}') {
+ /* end of this block; return from the function
+ (and from this "while" loop) */
+
+ line = StripLeft(line + 1);
+ if (*line != 0 && *line != CONF_COMMENT) {
+ delete ret;
+ error.Format(config_file_domain,
+ "line %i: Unknown tokens after '}'",
+ *count);
+ return nullptr;
+ }
+
+ return ret;
+ }
+
+ /* parse name and value */
+
+ if (!config_read_name_value(ret, line, *count, error)) {
+ assert(*line != 0);
+ delete ret;
+ error.FormatPrefix("line %i: ", *count);
+ return nullptr;
+ }
+ }
+}
+
+gcc_nonnull_all
+static void
+Append(config_param *&head, config_param *p)
+{
+ assert(p->next == nullptr);
+
+ config_param **i = &head;
+ while (*i != nullptr)
+ i = &(*i)->next;
+
+ *i = p;
+}
+
+static bool
+ReadConfigFile(ConfigData &config_data, FILE *fp, Error &error)
+{
+ assert(fp != nullptr);
+
+ char string[MAX_STRING_SIZE + 1];
+ int count = 0;
+ struct config_param *param;
+
+ while (fgets(string, MAX_STRING_SIZE, fp)) {
+ char *line;
+ const char *name, *value;
+
+ count++;
+
+ line = StripLeft(string);
+ if (*line == 0 || *line == CONF_COMMENT)
+ continue;
+
+ /* the first token in each line is the name, followed
+ by either the value or '{' */
+
+ Tokenizer tokenizer(line);
+ name = tokenizer.NextWord(error);
+ if (name == nullptr) {
+ assert(!tokenizer.IsEnd());
+ error.FormatPrefix("line %i: ", count);
+ return false;
+ }
+
+ /* get the definition of that option, and check the
+ "repeatable" flag */
+
+ const ConfigOption o = ParseConfigOptionName(name);
+ if (o == CONF_MAX) {
+ error.Format(config_file_domain,
+ "unrecognized parameter in config file at "
+ "line %i: %s\n", count, name);
+ return false;
+ }
+
+ const unsigned i = unsigned(o);
+ const ConfigTemplate &option = config_templates[i];
+ config_param *&head = config_data.params[i];
+
+ if (head != nullptr && !option.repeatable) {
+ param = head;
+ error.Format(config_file_domain,
+ "config parameter \"%s\" is first defined "
+ "on line %i and redefined on line %i\n",
+ name, param->line, count);
+ return false;
+ }
+
+ /* now parse the block or the value */
+
+ if (option.block) {
+ /* it's a block, call config_read_block() */
+
+ if (tokenizer.CurrentChar() != '{') {
+ error.Format(config_file_domain,
+ "line %i: '{' expected", count);
+ return false;
+ }
+
+ line = StripLeft(tokenizer.Rest() + 1);
+ if (*line != 0 && *line != CONF_COMMENT) {
+ error.Format(config_file_domain,
+ "line %i: Unknown tokens after '{'",
+ count);
+ return false;
+ }
+
+ param = config_read_block(fp, &count, string, error);
+ if (param == nullptr) {
+ return false;
+ }
+ } else {
+ /* a string value */
+
+ value = tokenizer.NextString(error);
+ if (value == nullptr) {
+ if (tokenizer.IsEnd())
+ error.Format(config_file_domain,
+ "line %i: Value missing",
+ count);
+ else
+ error.FormatPrefix("line %i: ", count);
+
+ return false;
+ }
+
+ if (!tokenizer.IsEnd() &&
+ tokenizer.CurrentChar() != CONF_COMMENT) {
+ error.Format(config_file_domain,
+ "line %i: Unknown tokens after value",
+ count);
+ return false;
+ }
+
+ param = new config_param(value, count);
+ }
+
+ Append(head, param);
+ }
+
+ return true;
+}
+
+bool
+ReadConfigFile(ConfigData &config_data, Path path, Error &error)
+{
+ assert(!path.IsNull());
+ const std::string path_utf8 = path.ToUTF8();
+
+ FormatDebug(config_file_domain, "loading file %s", path_utf8.c_str());
+
+ FILE *fp = FOpen(path, FOpenMode::ReadText);
+ if (fp == nullptr) {
+ error.FormatErrno("Failed to open %s", path_utf8.c_str());
+ return false;
+ }
+
+ bool result = ReadConfigFile(config_data, fp, error);
+ fclose(fp);
+ return result;
+}
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