src/cygw32.c

   1 /* Cygwin support routines.
   2    Copyright (C) 2011-2018 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software: you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation, either version 3 of the License, or (at
   9 your option) any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
  18
  19
  20 #include "cygw32.h"
  21 #include "character.h"
  22 #include "buffer.h"
  23 #include <unistd.h>
  24 #include <fcntl.h>
  25
  26 static void
  27 fchdir_unwind (int dir_fd)
  28 {
  29   (void) fchdir (dir_fd);
  30   (void) close (dir_fd);
  31 }
  32
  33 static void
  34 chdir_to_default_directory (void)
  35 {
  36   Lisp_Object new_cwd;
  37   int old_cwd_fd = emacs_open (".", O_RDONLY | O_DIRECTORY, 0);
  38
  39   if (old_cwd_fd == -1)
  40     error ("could not open current directory: %s", strerror (errno));
  41
  42   record_unwind_protect_int (fchdir_unwind, old_cwd_fd);
  43
  44   new_cwd = Funhandled_file_name_directory (
  45     Fexpand_file_name (build_string ("."), Qnil));
  46   if (!STRINGP (new_cwd))
  47     new_cwd = build_string ("/");
  48
  49   if (chdir (SSDATA (ENCODE_FILE (new_cwd))))
  50     error ("could not chdir: %s", strerror (errno));
  51 }
  52
  53 static Lisp_Object
  54 conv_filename_to_w32_unicode (Lisp_Object in, int absolute_p)
  55 {
  56   ssize_t converted_len;
  57   Lisp_Object converted;
  58   unsigned flags;
  59   int count = SPECPDL_INDEX ();
  60
  61   chdir_to_default_directory ();
  62
  63   flags = CCP_POSIX_TO_WIN_W;
  64   if (!absolute_p) {
  65     flags |= CCP_RELATIVE;
  66   }
  67
  68   in = ENCODE_FILE (in);
  69
  70   converted_len = cygwin_conv_path (flags, SDATA (in), NULL, 0);
  71   if (converted_len < 2)
  72     error ("cygwin_conv_path: %s", strerror (errno));
  73
  74   converted = make_uninit_string (converted_len - 1);
  75   if (cygwin_conv_path (flags, SDATA (in),
  76                         SDATA (converted), converted_len))
  77     error ("cygwin_conv_path: %s", strerror (errno));
  78
  79   return unbind_to (count, converted);
  80 }
  81
  82 static Lisp_Object
  83 conv_filename_from_w32_unicode (const wchar_t* in, int absolute_p)
  84 {
  85   ssize_t converted_len;
  86   Lisp_Object converted;
  87   unsigned flags;
  88   int count = SPECPDL_INDEX ();
  89
  90   chdir_to_default_directory ();
  91
  92   flags = CCP_WIN_W_TO_POSIX;
  93   if (!absolute_p) {
  94     flags |= CCP_RELATIVE;
  95   }
  96
  97   converted_len = cygwin_conv_path (flags, in, NULL, 0);
  98   if (converted_len < 1)
  99     error ("cygwin_conv_path: %s", strerror (errno));
 100
 101   converted = make_uninit_string (converted_len - 1 /*subtract terminator*/);
 102   if (cygwin_conv_path (flags, in, SDATA (converted), converted_len))
 103     error ("cygwin_conv_path: %s", strerror (errno));
 104
 105   return unbind_to (count, DECODE_FILE (converted));
 106 }
 107
 108 DEFUN ("cygwin-convert-file-name-to-windows",
 109        Fcygwin_convert_file_name_to_windows,
 110        Scygwin_convert_file_name_to_windows,
 111        1, 2, 0,
 112        doc: /* Convert a Cygwin file name FILE to a Windows-style file name.
 113 If ABSOLUTE-P is non-nil, return an absolute file name.
 114 For the reverse operation, see `cygwin-convert-file-name-from-windows'.  */)
 115   (Lisp_Object file, Lisp_Object absolute_p)
 116 {
 117   return from_unicode (
 118     conv_filename_to_w32_unicode (file, EQ (absolute_p, Qnil) ? 0 : 1));
 119 }
 120
 121 DEFUN ("cygwin-convert-file-name-from-windows",
 122        Fcygwin_convert_file_name_from_windows,
 123        Scygwin_convert_file_name_from_windows,
 124        1, 2, 0,
 125        doc: /* Convert a Windows-style file name FILE to a Cygwin file name.
 126 If ABSOLUTE-P is non-nil, return an absolute file name.
 127 For the reverse operation, see `cygwin-convert-file-name-to-windows'.  */)
 128   (Lisp_Object file, Lisp_Object absolute_p)
 129 {
 130   return conv_filename_from_w32_unicode (to_unicode (file, &file),
 131                                          EQ (absolute_p, Qnil) ? 0 : 1);
 132 }
 133
 134 void
 135 syms_of_cygw32 (void)
 136 {
 137   defsubr (&Scygwin_convert_file_name_from_windows);
 138   defsubr (&Scygwin_convert_file_name_to_windows);
 139 }