core,w32: Improve handling of Unicode paths

* src/dirinfo.c (get_gpgconf_item): Use _gpgme_access.
* src/posix-util.c (_gpgme_access): Add forward to normal access.
* src/sys-util.h (_gpgme_access): New for posix and w32.
* src/w32-io.c (_gpgme_io_spawn): Use _gpgme_crate_process_utf8.
* src/w32-util.c (utf8_to_wchar, utf8_to_wchar0): The usual w32 conv.
(find_program_in_dir): Use _gpgme_access.
(find_program_at_standard_place): Use wchar API and convert to UTF-8.
(_gpgme_access): Convert UTF-8 to wchar and use wchar API.
(_gpgme_create_process_utf8): Convert UTF-8 to wchar and use wchar API.

--
While we should not say that we have full support for unicode path
installations of GnuPG, this ensures that GPGME works if GPGME
itself is installed in a unicode path. e.g.: Libreoffice supports
this.

GnuPG-Bug-Id: T4453

Based on a patch provided by Egor Pugin. Thanks.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/posix-util.c b/src/posix-util.c
index 881856ca..cddb31f4 100644
--- a/src/posix-util.c
+++ b/src/posix-util.c
@@ -157,3 +157,10 @@ _gpgme_allow_set_foreground_window (pid_t pid)
   (void)pid;
   /* Not needed.  */
 }
+
+/* See w32-util.c */
+int
+_gpgme_access (const char *path, int mode)
+{
+  return access (path, mode);
+}