thodg/libgit2/src/win32/w32_util.c

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• Hash : bdec3363
  Author :
  Date : 2015-08-03T17:48:33
  

  win32: ensure hidden files can be staged

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• src/win32/w32_util.c

• /*
   * 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.
   */
  
  #include "w32_util.h"
  
  /**
   * Creates a FindFirstFile(Ex) filter string from a UTF-8 path.
   * The filter string enumerates all items in the directory.
   *
   * @param dest The buffer to receive the filter string.
   * @param src The UTF-8 path of the directory to enumerate.
   * @return True if the filter string was created successfully; false otherwise
   */
  bool git_win32__findfirstfile_filter(git_win32_path dest, const char *src)
  {
  	static const wchar_t suffix[] = L"\\*";
  	int len = git_win32_path_from_utf8(dest, src);
  
  	/* Ensure the path was converted */
  	if (len < 0)
  		return false;
  
  	/* Ensure that the path does not end with a trailing slash,
  	 * because we're about to add one. Don't rely our trim_end
  	 * helper, because we want to remove the backslash even for
  	 * drive letter paths, in this case. */
  	if (len > 0 &&
  		(dest[len - 1] == L'/' || dest[len - 1] == L'\\')) {
  		dest[len - 1] = L'\0';
  		len--;
  	}
  
  	/* Ensure we have enough room to add the suffix */
  	if ((size_t)len >= GIT_WIN_PATH_UTF16 - CONST_STRLEN(suffix))
  		return false;
  
  	wcscat(dest, suffix);
  	return true;
  }
  
  /**
   * Ensures the given path (file or folder) has the +H (hidden) attribute set.
   *
   * @param path The path which should receive the +H bit.
   * @return 0 on success; -1 on failure
   */
  int git_win32__set_hidden(const char *path, bool hidden)
  {
  	git_win32_path buf;
  	DWORD attrs, newattrs;
  
  	if (git_win32_path_from_utf8(buf, path) < 0)
  		return -1;
  
  	attrs = GetFileAttributesW(buf);
  
  	/* Ensure the path exists */
  	if (attrs == INVALID_FILE_ATTRIBUTES)
  		return -1;
  
  	if (hidden)
  		newattrs = attrs | FILE_ATTRIBUTE_HIDDEN;
  	else
  		newattrs = attrs & ~FILE_ATTRIBUTE_HIDDEN;
  
  	if (attrs != newattrs && !SetFileAttributesW(buf, newattrs)) {
  		giterr_set(GITERR_OS, "Failed to %s hidden bit for '%s'",
  			hidden ? "set" : "unset", path);
  		return -1;
  	}
  
  	return 0;
  }
  
  int git_win32__hidden(bool *out, const char *path)
  {
  	git_win32_path buf;
  	DWORD attrs;
  
  	if (git_win32_path_from_utf8(buf, path) < 0)
  		return -1;
  
  	attrs = GetFileAttributesW(buf);
  
  	/* Ensure the path exists */
  	if (attrs == INVALID_FILE_ATTRIBUTES)
  		return -1;
  
  	*out = (attrs & FILE_ATTRIBUTE_HIDDEN) ? true : false;
  	return 0;
  }
  
  /**
   * Removes any trailing backslashes from a path, except in the case of a drive
   * letter path (C:\, D:\, etc.). This function cannot fail.
   *
   * @param path The path which should be trimmed.
   * @return The length of the modified string (<= the input length)
   */
  size_t git_win32__path_trim_end(wchar_t *str, size_t len)
  {
  	while (1) {
  		if (!len || str[len - 1] != L'\\')
  			break;
  
  		/* Don't trim backslashes from drive letter paths, which
  		 * are 3 characters long and of the form C:\, D:\, etc. */
  		if (len == 3 && git_win32__isalpha(str[0]) && str[1] == ':')
  			break;
  
  		len--;
  	}
  
  	str[len] = L'\0';
  
  	return len;
  }
  
  /**
   * Removes any of the following namespace prefixes from a path,
   * if found: "\??\", "\\?\", "\\?\UNC\". This function cannot fail.
   *
   * @param path The path which should be converted.
   * @return The length of the modified string (<= the input length)
   */
  size_t git_win32__canonicalize_path(wchar_t *str, size_t len)
  {
  	static const wchar_t dosdevices_prefix[] = L"\\\?\?\\";
  	static const wchar_t nt_prefix[] = L"\\\\?\\";
  	static const wchar_t unc_prefix[] = L"UNC\\";
  	size_t to_advance = 0;
  
  	/* "\??\" -- DOS Devices prefix */
  	if (len >= CONST_STRLEN(dosdevices_prefix) &&
  		!wcsncmp(str, dosdevices_prefix, CONST_STRLEN(dosdevices_prefix))) {
  		to_advance += CONST_STRLEN(dosdevices_prefix);
  		len -= CONST_STRLEN(dosdevices_prefix);
  	}
  	/* "\\?\" -- NT namespace prefix */
  	else if (len >= CONST_STRLEN(nt_prefix) &&
  		!wcsncmp(str, nt_prefix, CONST_STRLEN(nt_prefix))) {
  		to_advance += CONST_STRLEN(nt_prefix);
  		len -= CONST_STRLEN(nt_prefix);
  	}
  
  	/* "\??\UNC\", "\\?\UNC\" -- UNC prefix */
  	if (to_advance && len >= CONST_STRLEN(unc_prefix) &&
  		!wcsncmp(str + to_advance, unc_prefix, CONST_STRLEN(unc_prefix))) {
  		to_advance += CONST_STRLEN(unc_prefix);
  		len -= CONST_STRLEN(unc_prefix);
  	}
  
  	if (to_advance) {
  		memmove(str, str + to_advance, len * sizeof(wchar_t));
  		str[len] = L'\0';
  	}
  
  	return git_win32__path_trim_end(str, len);
  }
  

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