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| | /* Cygwin support routines.
Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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 3 of the License, or
(at your option) any later version.
GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include "cygw32.h"
#include "character.h"
#include "buffer.h"
#include <unistd.h>
#include <fcntl.h>
static Lisp_Object Qutf_16_le;
static Lisp_Object
fchdir_unwind (Lisp_Object dir_fd)
{
(void) fchdir (XFASTINT (dir_fd));
(void) close (XFASTINT (dir_fd));
return Qnil;
}
static void
chdir_to_default_directory ()
{
Lisp_Object new_cwd;
int old_cwd_fd = open (".", O_RDONLY | O_DIRECTORY);
if (old_cwd_fd == -1)
error ("could not open current directory: %s", strerror (errno));
record_unwind_protect (fchdir_unwind, make_number (old_cwd_fd));
new_cwd = Funhandled_file_name_directory (
Fexpand_file_name (build_string ("."), Qnil));
if (!STRINGP (new_cwd))
new_cwd = build_string ("/");
if (chdir (SDATA (ENCODE_FILE (new_cwd))))
error ("could not chdir: %s", strerror (errno));
}
static Lisp_Object
conv_filename_to_w32_unicode (Lisp_Object in, int absolute_p)
{
ssize_t converted_len;
Lisp_Object converted;
unsigned flags;
int count = SPECPDL_INDEX ();
chdir_to_default_directory ();
flags = CCP_POSIX_TO_WIN_W;
if (!absolute_p) {
flags |= CCP_RELATIVE;
}
in = ENCODE_FILE (in);
converted_len = cygwin_conv_path (flags, SDATA (in), NULL, 0);
if (converted_len < 2)
error ("cygwin_conv_path: %s", strerror (errno));
converted = make_uninit_string (converted_len - 1);
if (cygwin_conv_path (flags, SDATA (in),
SDATA (converted), converted_len))
error ("cygwin_conv_path: %s", strerror (errno));
return unbind_to (count, converted);
}
static Lisp_Object
conv_filename_from_w32_unicode (const wchar_t* in, int absolute_p)
{
ssize_t converted_len;
Lisp_Object converted;
unsigned flags;
int count = SPECPDL_INDEX ();
chdir_to_default_directory ();
flags = CCP_WIN_W_TO_POSIX;
if (!absolute_p) {
flags |= CCP_RELATIVE;
}
converted_len = cygwin_conv_path (flags, in, NULL, 0);
if (converted_len < 1)
error ("cygwin_conv_path: %s", strerror (errno));
converted = make_uninit_string (converted_len - 1 /*subtract terminator*/);
if (cygwin_conv_path (flags, in, SDATA (converted), converted_len))
error ("cygwin_conv_path: %s", strerror (errno));
return unbind_to (count, DECODE_FILE (converted));
}
Lisp_Object
from_unicode (Lisp_Object str)
{
CHECK_STRING (str);
if (!STRING_MULTIBYTE (str) &&
SBYTES (str) & 1)
{
str = Fsubstring (str, make_number (0), make_number (-1));
}
return code_convert_string_norecord (str, Qutf_16_le, 0);
}
wchar_t*
to_unicode (Lisp_Object str, Lisp_Object* buf)
{
*buf = code_convert_string_norecord (str, Qutf_16_le, 1);
/* We need to make a another copy (in addition to the one made by
code_convert_string_norecord) to ensure that the final string is
_doubly_ zero terminated --- that is, that the string is
terminated by two zero bytes and one utf-16le null character.
Because strings are already terminated with a single zero byte,
we just add one additional zero. */
str = make_uninit_string (SBYTES (*buf) + 1);
memcpy (SDATA (str), SDATA (*buf), SBYTES (*buf));
SDATA (str) [SBYTES (*buf)] = '\0';
*buf = str;
return WCSDATA (*buf);
}
DEFUN ("cygwin-convert-path-to-windows",
Fcygwin_convert_path_to_windows, Scygwin_convert_path_to_windows,
1, 2, 0,
doc: /* Convert PATH to a Windows path. If ABSOLUTE-P if
non-nil, return an absolute path.*/)
(Lisp_Object path, Lisp_Object absolute_p)
{
return from_unicode (
conv_filename_to_w32_unicode (path, absolute_p == Qnil ? 0 : 1));
}
DEFUN ("cygwin-convert-path-from-windows",
Fcygwin_convert_path_from_windows, Scygwin_convert_path_from_windows,
1, 2, 0,
doc: /* Convert a Windows path to a Cygwin path. If ABSOLUTE-P
if non-nil, return an absolute path.*/)
(Lisp_Object path, Lisp_Object absolute_p)
{
return conv_filename_from_w32_unicode (to_unicode (path, &path),
absolute_p == Qnil ? 0 : 1);
}
void
syms_of_cygw32 (void)
{
/* No, not utf-16-le: that one has a BOM. */
DEFSYM (Qutf_16_le, "utf-16le");
defsubr (&Scygwin_convert_path_from_windows);
defsubr (&Scygwin_convert_path_to_windows);
}
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