avoid calling bb_strtou twice in MIN macro expansion

Also, the maximum allowable value of swap priority is technically SWAP_FLAG_PRIO_MASK >> SWAP_FLAG_PRIO_SHIFT.

Signed-off-by: Matt Whitlock <busybox@mattwhitlock.name>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index 3f223343e..bcceff772 100644
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -100,12 +100,12 @@ static int do_em_all(void)
                                 g_flags = 0; /* each swap space might have different flags */
                                 p = hasmntopt(m, "pri");
                                 if (p) {
-                                        /* Max allowed 32767 (==SWAP_FLAG_PRIO_MASK) */
-                                        unsigned int swap_prio = MIN(bb_strtou(p + 4 , NULL, 10), SWAP_FLAG_PRIO_MASK);
+                                        /* Max allowed 32767 (== SWAP_FLAG_PRIO_MASK) */
+                                        unsigned prio = bb_strtou(p + 4, NULL, 10);
                                         /* We want to allow "NNNN,foo", thus errno == EINVAL is allowed too */
                                         if (errno != ERANGE) {
                                                 g_flags = SWAP_FLAG_PREFER |
-                                                        (swap_prio << SWAP_FLAG_PRIO_SHIFT);
+                                                        MIN(prio, SWAP_FLAG_PRIO_MASK);
                                         }
                                 }
 #endif
@@ -124,6 +124,9 @@ int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
 {
         int ret;
+#if ENABLE_FEATURE_SWAPON_PRI
+        unsigned prio;
+#endif
 
         INIT_G();
 
@@ -132,11 +135,11 @@ int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
 #else
         if (applet_name[5] == 'n')
                 opt_complementary = "p+";
-        ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
+        ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &prio);
 
         if (ret & 2) { // -p
                 g_flags = SWAP_FLAG_PREFER |
-                        ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
+                        MIN(prio, SWAP_FLAG_PRIO_MASK);
                 ret &= 1;
         }
 #endif