w32: Support file names longer than MAX_PATH.

* src/sysutils.c (any8bitchar): Remove.
(_gpgrt_fname_to_wchar): New.
(_gpgrt_mkdir): Use instead of plain utf8 conversion.
(_gpgrt_access): Reimplement using GetFileAttributesW so that long
files names are supported.
* src/estream.c (_gpgrt_w32_get_last_err_code): New.
(func_file_create_w32): New.
(_gpgrt_fopen): Handle the "sysopen" mode flag.  Support mapping of
/dev/null.
(_gpgrt_freopen): Support mapping of /dev/null.
* src/w32-gettext.c (load_domain): Allow long file names.

* src/visibility.c (gpgrt_free_wchar): Make function public.
(gpgrt_fname_to_wchar): Ditto.
(gpgrt_utf8_to_wchar): Ditto.
(gpgrt_wchar_to_utf8): Ditto.
* src/w32-add.h  (gpgrt_free_wchar): New prototype.
(gpgrt_fname_to_wchar): Ditto.
(gpgrt_utf8_to_wchar): Ditto.
(gpgrt_wchar_to_utf8): Ditto.
* src/gpg-error.def.in: Add them here too.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/w32-add.h b/src/w32-add.h
index 3428961..74696bd 100644
--- a/src/w32-add.h
+++ b/src/w32-add.h
@@ -61,6 +61,22 @@ size_t  gpgrt_w32_iconv (gpgrt_w32_iconv_t cd,
 # define iconv(a,b,c,d,e) gpgrt_w32_iconv ((a),(b),(c),(d),(e))
 #endif /*GPGRT_ENABLE_W32_ICONV_MACROS*/
 
+/* Release a wchar_t * buffer.  */
+void gpgrt_free_wchar (wchar_t *wstring);
+
+/* Convert an UTF-8 encoded file name to wchar.
+ * Prepend a '\\?\' prefix if needed.  */
+wchar_t *gpgrt_fname_to_wchar (const char *fname);
+
+/* Convert an UTF8 string to a WCHAR string.  Caller should use
+ * gpgrt_free_wchar to release the result.
+ * Returns NULL on error and sets ERRNO. */
+wchar_t *gpgrt_utf8_to_wchar (const char *string);
+
+/* Convert a WCHAR string to UTF-8.  Caller should use gpgrt_free to
+ * release the result.   Returns NULL on error and sets ERRNO.  */
+char *gpgrt_wchar_to_utf8 (const wchar_t *wstring);
+
 /* Query a string in the registry.  */
 char *gpgrt_w32_reg_query_string (const char *root,
                                   const char *dir,