Fix "Load/Save to cloudstorage" for non-ASCII user names

On Windows that would fail because stat() doesn't deal well with our
utf8 strings.

Added new subsurface_stat() portability function to replace stat().
Added Windows implementation of subsurface_stat() using wstat(),
with conversion to ut16 of the inputed path.
Other platform implementations (linux, android) make use of the normal stat().

Added non ASCII test case in TestGitStorage::testGitStorageLocal()

Signed-off-by: Jeremie Guichard <djebrest@gmail.com>

core/android.cpp

@@ -176,6 +176,11 @@ int subsurface_access(const char *path, int mode)
 	return access(path, mode);
 }
 
+int subsurface_stat(const char* path, struct stat* buf)
+{
+	return stat(path, buf);
+}
+
 struct zip *subsurface_zip_open_readonly(const char *path, int flags, int *errorp)
 {
 	return zip_open(path, flags, errorp);

core/dive.h

@@ -8,6 +8,7 @@
 #include <zip.h>
 #include <sqlite3.h>
 #include <string.h>
+#include <sys/stat.h>
 #include "divesite.h"
 
 /* Windows has no MIN/MAX macros - so let's just roll our own */
@@ -728,6 +729,7 @@ extern int subsurface_open(const char *path, int oflags, mode_t mode);
 extern FILE *subsurface_fopen(const char *path, const char *mode);
 extern void *subsurface_opendir(const char *path);
 extern int subsurface_access(const char *path, int mode);
+extern int subsurface_stat(const char* path, struct stat* buf);
 extern struct zip *subsurface_zip_open_readonly(const char *path, int flags, int *errorp);
 extern int subsurface_zip_close(struct zip *zip);
 extern void subsurface_console_init(bool dedicated, bool logfile);

core/git-access.c

@@ -768,7 +768,7 @@ static struct git_repository *get_remote_repo(const char *localdir, const char *
 	}
 	git_storage_update_progress(false, "start git interaction");
 	/* Do we already have a local cache? */
-	if (!stat(localdir, &st)) {
+	if (!subsurface_stat(localdir, &st)) {
 		if (!S_ISDIR(st.st_mode)) {
 			if (is_subsurface_cloud)
 				(void)cleanup_local_cache(remote, branch);
@@ -934,7 +934,7 @@ struct git_repository *is_git_repository(const char *filename, const char **bran
 		return repo;
 	}
 
-	if (stat(loc, &st) < 0 || !S_ISDIR(st.st_mode)) {
+	if (subsurface_stat(loc, &st) < 0 || !S_ISDIR(st.st_mode)) {
 		free(loc);
 		free(branch);
 		return dummy_git_repository;

core/linux.c

@@ -204,6 +204,11 @@ int subsurface_access(const char *path, int mode)
 	return access(path, mode);
 }
 
+int subsurface_stat(const char* path, struct stat* buf)
+{
+	return stat(path, buf);
+}
+
 struct zip *subsurface_zip_open_readonly(const char *path, int flags, int *errorp)
 {
 	return zip_open(path, flags, errorp);

core/windows.c

@@ -346,6 +346,18 @@ int subsurface_access(const char *path, int mode)
 	return ret;
 }
 
+int subsurface_stat(const char* path, struct stat* buf)
+{
+	int ret = -1;
+	if (!path)
+		return ret;
+	wchar_t *wpath = utf8_to_utf16(path);
+	if (wpath)
+		ret = wstat(wpath, buf);
+	free((void *)wpath);
+	return ret;
+}
+
 #ifndef O_BINARY
 #define O_BINARY 0
 #endif

tests/testgitstorage.cpp

@@ -64,6 +64,7 @@ void TestGitStorage::testGitStorageLocal_data()
 	// test different path we may encounter (since storage depends on user name)
 	QTest::addColumn<QString>("testDirName");
 	QTest::newRow("ASCII path") << "./gittest";
+	QTest::newRow("Non ASCII path") << "./gittest_éèêôàüäößíñóúäåöø";
 }
 
 void TestGitStorage::testGitStorageLocal()