thodg/libgit2/include/git2/sys/config.h

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• Hash : 9a97f49e
  Author :
  Date : 2014-12-21T15:31:03
  

  config: borrow refcounted references This changes the get_entry() method to return a refcounted version of the config entry, which you have to free when you're done. This allows us to avoid freeing the memory in which the entry is stored on a refresh, which may happen at any time for a live config. For this reason, get_string() has been forbidden on live configs and a new function get_string_buf() has been added, which stores the string in a git_buf which the user then owns. The functions which parse the string value takea advantage of the borrowing to parse safely and then release the entry.

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• include/git2/sys/config.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  #ifndef INCLUDE_sys_git_config_backend_h__
  #define INCLUDE_sys_git_config_backend_h__
  
  #include "git2/common.h"
  #include "git2/types.h"
  #include "git2/config.h"
  
  /**
   * @file git2/sys/config.h
   * @brief Git config backend routines
   * @defgroup git_backend Git custom backend APIs
   * @ingroup Git
   * @{
   */
  GIT_BEGIN_DECL
  
  /**
   * Every iterator must have this struct as its first element, so the
   * API can talk to it. You'd define your iterator as
   *
   *     struct my_iterator {
   *             git_config_iterator parent;
   *             ...
   *     }
   *
   * and assign `iter->parent.backend` to your `git_config_backend`.
   */
  struct git_config_iterator {
  	git_config_backend *backend;
  	unsigned int flags;
  
  	/**
  	 * Return the current entry and advance the iterator. The
  	 * memory belongs to the library.
  	 */
  	int (*next)(git_config_entry **entry, git_config_iterator *iter);
  
  	/**
  	 * Free the iterator
  	 */
  	void (*free)(git_config_iterator *iter);
  };
  
  /**
   * Generic backend that implements the interface to
   * access a configuration file
   */
  struct git_config_backend {
  	unsigned int version;
  	/** True if this backend is for a snapshot */
  	int readonly;
  	struct git_config *cfg;
  
  	/* Open means open the file/database and parse if necessary */
  	int (*open)(struct git_config_backend *, git_config_level_t level);
  	int (*get)(struct git_config_backend *, const char *key, git_config_entry **entry);
  	int (*set)(struct git_config_backend *, const char *key, const char *value);
  	int (*set_multivar)(git_config_backend *cfg, const char *name, const char *regexp, const char *value);
  	int (*del)(struct git_config_backend *, const char *key);
  	int (*del_multivar)(struct git_config_backend *, const char *key, const char *regexp);
  	int (*iterator)(git_config_iterator **, struct git_config_backend *);
  	/** Produce a read-only version of this backend */
  	int (*snapshot)(struct git_config_backend **, struct git_config_backend *);
  	void (*free)(struct git_config_backend *);
  };
  #define GIT_CONFIG_BACKEND_VERSION 1
  #define GIT_CONFIG_BACKEND_INIT {GIT_CONFIG_BACKEND_VERSION}
  
  /**
   * Initializes a `git_config_backend` with default values. Equivalent to
   * creating an instance with GIT_CONFIG_BACKEND_INIT.
   *
   * @param opts the `git_config_backend` struct to initialize.
   * @param version Version of struct; pass `GIT_CONFIG_BACKEND_VERSION`
   * @return Zero on success; -1 on failure.
   */
  GIT_EXTERN(int) git_config_init_backend(
  	git_config_backend *backend,
  	unsigned int version);
  
  /**
   * Add a generic config file instance to an existing config
   *
   * Note that the configuration object will free the file
   * automatically.
   *
   * Further queries on this config object will access each
   * of the config file instances in order (instances with
   * a higher priority level will be accessed first).
   *
   * @param cfg the configuration to add the file to
   * @param file the configuration file (backend) to add
   * @param level the priority level of the backend
   * @param force if a config file already exists for the given
   *  priority level, replace it
   * @return 0 on success, GIT_EEXISTS when adding more than one file
   *  for a given priority level (and force_replace set to 0), or error code
   */
  GIT_EXTERN(int) git_config_add_backend(
  	git_config *cfg,
  	git_config_backend *file,
  	git_config_level_t level,
  	int force);
  
  /** @} */
  GIT_END_DECL
  #endif
  

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