thodg/libgit2/src/win32/path_w32.h

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• Hash : 0c7f49dd
  Author :
  Date : 2017-06-30T13:39:01
  

  Make sure to always include "common.h" first Next to including several files, our "common.h" header also declares various macros which are then used throughout the project. As such, we have to make sure to always include this file first in all implementation files. Otherwise, we might encounter problems or even silent behavioural differences due to macros or defines not being defined as they should be. So in fact, our header and implementation files should make sure to always include "common.h" first. This commit does so by establishing a common include pattern. Header files inside of "src" will now always include "common.h" as its first other file, separated by a newline from all the other includes to make it stand out as special. There are two cases for the implementation files. If they do have a matching header file, they will always include this one first, leading to "common.h" being transitively included as first file. If they do not have a matching header file, they instead include "common.h" as first file themselves. This fixes the outlined problems and will become our standard practice for header and source files inside of the "src/" from now on.

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• src/win32/path_w32.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_git_path_w32_h__
  #define INCLUDE_git_path_w32_h__
  
  #include "common.h"
  
  #include "vector.h"
  
  /*
   * Provides a large enough buffer to support Windows paths:  MAX_PATH is
   * 260, corresponding to a maximum path length of 259 characters plus a
   * NULL terminator.  Prefixing with "\\?\" adds 4 characters, but if the
   * original was a UNC path, then we turn "\\server\share" into
   * "\\?\UNC\server\share".  So we replace the first two characters with
   * 8 characters, a net gain of 6, so the maximum length is MAX_PATH+6.
   */
  #define GIT_WIN_PATH_UTF16		MAX_PATH+6
  
  /* Maximum size of a UTF-8 Win32 path.  We remove the "\\?\" or "\\?\UNC\"
   * prefixes for presentation, bringing us back to 259 (non-NULL)
   * characters.  UTF-8 does have 4-byte sequences, but they are encoded in
   * UTF-16 using surrogate pairs, which takes up the space of two characters.
   * Two characters in the range U+0800 -> U+FFFF take up more space in UTF-8
   * (6 bytes) than one surrogate pair (4 bytes).
   */
  #define GIT_WIN_PATH_UTF8		(259 * 3 + 1)
  
  /*
   * The length of a Windows "shortname", for 8.3 compatibility.
   */
  #define GIT_WIN_PATH_SHORTNAME  13
  
  /* Win32 path types */
  typedef wchar_t git_win32_path[GIT_WIN_PATH_UTF16];
  typedef char git_win32_utf8_path[GIT_WIN_PATH_UTF8];
  
  /**
   * Create a Win32 path (in UCS-2 format) from a UTF-8 string.
   *
   * @param dest The buffer to receive the wide string.
   * @param src The UTF-8 string to convert.
   * @return The length of the wide string, in characters (not counting the NULL terminator), or < 0 for failure
   */
  extern int git_win32_path_from_utf8(git_win32_path dest, const char *src);
  
  /**
   * Canonicalize a Win32 UCS-2 path so that it is suitable for delivery to the
   * Win32 APIs: remove multiple directory separators, squashing to a single one,
   * strip trailing directory separators, ensure directory separators are all
   * canonical (always backslashes, never forward slashes) and process any
   * directory entries of '.' or '..'.
   *
   * This processes the buffer in place.
   *
   * @param path The buffer to process
   * @return The new length of the buffer, in wchar_t's (not counting the NULL terminator)
   */
  extern int git_win32_path_canonicalize(git_win32_path path);
  
  /**
   * Create an internal format (posix-style) UTF-8 path from a Win32 UCS-2 path.
   *
   * @param dest The buffer to receive the UTF-8 string.
   * @param src The wide string to convert.
   * @return The length of the UTF-8 string, in bytes (not counting the NULL terminator), or < 0 for failure
   */
  extern int git_win32_path_to_utf8(git_win32_utf8_path dest, const wchar_t *src);
  
  /**
   * Get the short name for the terminal path component in the given path.
   * For example, given "C:\Foo\Bar\Asdf.txt", this will return the short name
   * for the file "Asdf.txt".
   *
   * @param path The given path in UTF-8
   * @return The name of the shortname for the given path
   */
  extern char *git_win32_path_8dot3_name(const char *path);
  
  extern int git_win32_path_readlink_w(git_win32_path dest, const git_win32_path path);
  
  #endif
  

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