Create GID_NONE for use gid test readability.

generator.c

@@ -54,14 +54,14 @@ static int skip_file(char *fname,
 	}
 	if (link_dest) {
 		if (preserve_perms
-		 && (st->st_mode & ~_S_IFMT) != (file->mode & ~_S_IFMT))
+		    && (st->st_mode & ~_S_IFMT) != (file->mode & ~_S_IFMT))
 			return 0;
 
 		if (am_root && preserve_uid && st->st_uid != file->uid)
 			return 0;
 
-		if (preserve_gid && file->gid != (gid_t)-1
-		 && st->st_gid != file->gid)
+		if (preserve_gid && file->gid != GID_NONE
+		    && st->st_gid != file->gid)
 			return 0;
 	}
 

rsync.c

@@ -152,7 +152,7 @@ int set_perms(char *fname,struct file_struct *file,STRUCT_STAT *st,
 	}
 
 	change_uid = am_root && preserve_uid && st->st_uid != file->uid;
-	change_gid = preserve_gid && file->gid != (gid_t)-1
+	change_gid = preserve_gid && file->gid != GID_NONE
 		&& st->st_gid != file->gid;
 	if (change_uid || change_gid) {
 		if (do_lchown(fname,

rsync.h

@@ -362,6 +362,8 @@ enum logcode {FNONE=0, FERROR=1, FINFO=2, FLOG=3 };
 #define IN_LOOPBACKNET 127
 #endif
 
+#define GID_NONE (gid_t) -1
+
 struct file_struct {
 	unsigned flags;
 	time_t modtime;

uidlist.c

@@ -160,7 +160,7 @@ static gid_t match_gid(gid_t gid)
 	if (am_root)
 		last_out = gid;
 	else
-		last_out = (gid_t)-1;
+		last_out = GID_NONE;
 	return last_out;
 }
 
@@ -307,7 +307,7 @@ void recv_uid_list(int f, struct file_list *flist)
 			}
 			list->id2 = map_gid(id, name);
 			if (!am_root && !is_in_group(list->id2))
-				list->id2 = (gid_t)-1;
+				list->id2 = GID_NONE;
 			free(name);
 		}
 	}