From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 9 Jun 2021 15:24:43 +0000 (+0900)
Subject: ether-addr-util: introduce hw_addr_compare(), hw_addr_equal(), and hw_addr_is_null()
X-Git-Tag: v249-rc1~47^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30b977251ce76eaaae8e4a21836516b47fd7ed84;p=thirdparty%2Fsystemd.git

ether-addr-util: introduce hw_addr_compare(), hw_addr_equal(), and hw_addr_is_null()
---

diff --git a/src/basic/ether-addr-util.c b/src/basic/ether-addr-util.c
index 289faaba1b6..3925810768d 100644
--- a/src/basic/ether-addr-util.c
+++ b/src/basic/ether-addr-util.c
@@ -24,6 +24,19 @@ char* hw_addr_to_string(const struct hw_addr_data *addr, char buffer[HW_ADDR_TO_
         return buffer;
 }
 
+int hw_addr_compare(const struct hw_addr_data *a, const struct hw_addr_data *b) {
+        int r;
+
+        assert(a);
+        assert(b);
+
+        r = CMP(a->length, b->length);
+        if (r != 0)
+                return r;
+
+        return memcmp(a->bytes, b->bytes, a->length);
+}
+
 char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) {
         assert(addr);
         assert(buffer);
diff --git a/src/basic/ether-addr-util.h b/src/basic/ether-addr-util.h
index 6ca54f6af9c..46b5c0553ff 100644
--- a/src/basic/ether-addr-util.h
+++ b/src/basic/ether-addr-util.h
@@ -28,6 +28,14 @@ char* hw_addr_to_string(const struct hw_addr_data *addr, char buffer[HW_ADDR_TO_
 
 #define HW_ADDR_NULL ((const struct hw_addr_data){})
 
+int hw_addr_compare(const struct hw_addr_data *a, const struct hw_addr_data *b);
+static inline bool hw_addr_equal(const struct hw_addr_data *a, const struct hw_addr_data *b) {
+        return hw_addr_compare(a, b) == 0;
+}
+static inline bool hw_addr_is_null(const struct hw_addr_data *addr) {
+        return hw_addr_equal(addr, &HW_ADDR_NULL);
+}
+
 #define ETHER_ADDR_FORMAT_STR "%02X%02X%02X%02X%02X%02X"
 #define ETHER_ADDR_FORMAT_VAL(x) (x).ether_addr_octet[0], (x).ether_addr_octet[1], (x).ether_addr_octet[2], (x).ether_addr_octet[3], (x).ether_addr_octet[4], (x).ether_addr_octet[5]