X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fsd-id128.h;h=d835cf47688671fce90dff0936267c5ea87ec335;hb=94fb446e55babb713fb24850455627acf30d999b;hp=bfae78b97d2f106d5228bd976601f802aeb21a7c;hpb=87d2c1ff6a7375f03476767e6f59454bcc5cd04b;p=elogind.git

diff --git a/src/sd-id128.h b/src/sd-id128.h
index bfae78b97..d835cf476 100644
--- a/src/sd-id128.h
+++ b/src/sd-id128.h
@@ -49,6 +49,13 @@ int sd_id128_get_boot(sd_id128_t *ret);
         ((sd_id128_t) { .bytes = { 0x##v0, 0x##v1, 0x##v2, 0x##v3, 0x##v4, 0x##v5, 0x##v6, 0x##v7, \
                                    0x##v8, 0x##v9, 0x##v10, 0x##v11, 0x##v12, 0x##v13, 0x##v14, 0x##v15 }})
 
+/* Note that SD_ID128_FORMAT_VAL will evaluate the passed argument 16
+ * times. It is hence not a good idea to call this macro with an
+ * expensive function as paramater or an expression with side
+ * effects */
+#define SD_ID128_FORMAT_STR "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
+#define SD_ID128_FORMAT_VAL(x) (x).bytes[0], (x).bytes[1], (x).bytes[2], (x).bytes[3], (x).bytes[4], (x).bytes[5], (x).bytes[6], (x).bytes[7], (x).bytes[8], (x).bytes[9], (x).bytes[10], (x).bytes[11], (x).bytes[12], (x).bytes[13], (x).bytes[14], (x).bytes[15]
+
 static inline bool sd_id128_equal(sd_id128_t a, sd_id128_t b) {
         return memcmp(&a, &b, 16) == 0;
 }