diff options
Diffstat (limited to 'src/ConfigFile.cxx')
| -rw-r--r-- | src/ConfigFile.cxx | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/src/ConfigFile.cxx b/src/ConfigFile.cxx new file mode 100644 index 000000000..2573f66e5 --- /dev/null +++ b/src/ConfigFile.cxx @@ -0,0 +1,285 @@ +/* + * Copyright (C) 2003-2013 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 "ConfigQuark.hxx" +#include "ConfigData.hxx" +#include "ConfigTemplates.hxx" +#include "conf.h" +#include "util/Tokenizer.hxx" +#include "util/StringUtil.hxx" +#include "fs/Path.hxx" +#include "fs/FileSystem.hxx" + +#include <glib.h> + +#include <assert.h> +#include <string.h> +#include <stdio.h> +#include <errno.h> + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "config" + +#define MAX_STRING_SIZE MPD_PATH_MAX+80 + +#define CONF_COMMENT '#' + +static bool +config_read_name_value(struct config_param *param, char *input, unsigned line, + GError **error_r) +{ + Tokenizer tokenizer(input); + + const char *name = tokenizer.NextWord(error_r); + if (name == NULL) { + assert(!tokenizer.IsEnd()); + return false; + } + + const char *value = tokenizer.NextString(error_r); + if (value == NULL) { + if (tokenizer.IsEnd()) { + assert(error_r == NULL || *error_r == NULL); + g_set_error(error_r, config_quark(), 0, + "Value missing"); + } else { + assert(error_r == NULL || *error_r != NULL); + } + + return false; + } + + if (!tokenizer.IsEnd() && tokenizer.CurrentChar() != CONF_COMMENT) { + g_set_error(error_r, config_quark(), 0, + "Unknown tokens after value"); + return false; + } + + const struct block_param *bp = param->GetBlockParam(name); + if (bp != NULL) { + g_set_error(error_r, config_quark(), 0, + "\"%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, GError **error_r) +{ + struct config_param *ret = new config_param(*count); + GError *error = NULL; + + while (true) { + char *line; + + line = fgets(string, MAX_STRING_SIZE, fp); + if (line == NULL) { + delete ret; + g_set_error(error_r, config_quark(), 0, + "Expected '}' before end-of-file"); + return NULL; + } + + (*count)++; + line = strchug_fast(line); + if (*line == 0 || *line == CONF_COMMENT) + continue; + + if (*line == '}') { + /* end of this block; return from the function + (and from this "while" loop) */ + + line = strchug_fast(line + 1); + if (*line != 0 && *line != CONF_COMMENT) { + delete ret; + g_set_error(error_r, config_quark(), 0, + "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; + g_propagate_prefixed_error(error_r, error, + "line %i: ", *count); + return NULL; + } + } +} + +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, GError **error_r) +{ + 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; + GError *error = NULL; + + count++; + + line = strchug_fast(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 == NULL) { + assert(!tokenizer.IsEnd()); + g_propagate_prefixed_error(error_r, error, + "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) { + g_set_error(error_r, config_quark(), 0, + "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; + g_set_error(error_r, config_quark(), 0, + "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() != '{') { + g_set_error(error_r, config_quark(), 0, + "line %i: '{' expected", count); + return false; + } + + line = strchug_fast(tokenizer.Rest() + 1); + if (*line != 0 && *line != CONF_COMMENT) { + g_set_error(error_r, config_quark(), 0, + "line %i: Unknown tokens after '{'", + count); + return false; + } + + param = config_read_block(fp, &count, string, error_r); + if (param == NULL) { + return false; + } + } else { + /* a string value */ + + value = tokenizer.NextString(&error); + if (value == NULL) { + if (tokenizer.IsEnd()) + g_set_error(error_r, config_quark(), 0, + "line %i: Value missing", + count); + else { + g_set_error(error_r, config_quark(), 0, + "line %i: %s", count, + error->message); + g_error_free(error); + } + + return false; + } + + if (!tokenizer.IsEnd() && + tokenizer.CurrentChar() != CONF_COMMENT) { + g_set_error(error_r, config_quark(), 0, + "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, const Path &path, GError **error_r) +{ + assert(!path.IsNull()); + const std::string path_utf8 = path.ToUTF8(); + + g_debug("loading file %s", path_utf8.c_str()); + + FILE *fp = FOpen(path, FOpenMode::ReadText); + if (fp == nullptr) { + g_set_error(error_r, config_quark(), errno, + "Failed to open %s: %s", + path_utf8.c_str(), g_strerror(errno)); + return false; + } + + bool result = ReadConfigFile(config_data, fp, error_r); + fclose(fp); + return result; +} |