libcompat: Add a helper to get/set OS error state

On Unix like OSes, this saves/restores errno, on Windows both errno
and GetLastError state are saved/restored.

This should make it simpler to preserve that across function calls.

Additionally, while tracking down uses of GetLastError, some places
where the error code was printed out directly where replaced with
instances of w32_perror.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 6 insertions, 6 deletions

diff --git a/lib/sqfs/src/win32/ostream.c b/lib/sqfs/src/win32/ostream.c
index 3ebeb8b..2f85c29 100644
--- a/lib/sqfs/src/win32/ostream.c
+++ b/lib/sqfs/src/win32/ostream.c
@@ -59,9 +59,9 @@ static int realize_sparse(file_ostream_t *file)
 
 			ret = write_data(file, buffer, diff);
 			if (ret) {
-				DWORD temp = GetLastError();
+				os_error_t err = get_os_error_state();
 				free(buffer);
-				SetLastError(temp);
+				set_os_error_state(err);
 				return ret;
 			}
 
@@ -157,10 +157,10 @@ int sqfs_ostream_open_handle(sqfs_ostream_t **out, const char *path,
 			      GetCurrentProcess(), &file->hnd,
 			      0, FALSE, DUPLICATE_SAME_ACCESS);
 	if (!ret) {
-		DWORD temp = GetLastError();
+		os_error_t err = get_os_error_state();
 		free(file->path);
 		free(file);
-		SetLastError(temp);
+		set_os_error_state(err);
 		return SQFS_ERROR_IO;
 	}
 
@@ -191,9 +191,9 @@ int sqfs_ostream_open_file(sqfs_ostream_t **out, const char *path,
 
 	ret = sqfs_ostream_open_handle(out, path, hnd, flags);
 	if (ret) {
-		DWORD temp = GetLastError();
+		os_error_t err = get_os_error_state();
 		CloseHandle(hnd);
-		SetLastError(temp);
+		set_os_error_state(err);
 		return SQFS_ERROR_IO;
 	}