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sd-id128: add helpers to check fo all-0xFF ids

This commit is contained in:
Lennart Poettering 2018-12-14 11:46:07 +01:00
parent 463adf5710
commit 670814387b
2 changed files with 9 additions and 0 deletions
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4
NEWS
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@ -379,6 +379,10 @@ CHANGES WITH 240 in spe:
interface names even as systemd/udev are updated and the naming logic
is improved.
* sd-id128.h learnt two new auxiliary helpers: sd_id128_is_allf() and
SD_ID128_ALLF to test if a 128bit ID is set to all 0xFF bytes, and to
initialize one to all 0xFF.
Contributions from: afg, Alan Jenkins, Aleksei Timofeyev, Alexander
Filippov, Alexander Kurtz, Alexey Bogdanenko, Andreas Henriksson,
Andrew Jorgensen, Anita Zhang, apnix-uk, Arkan49, Arseny Maslennikov,

5
src/systemd/sd-id128.h
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@ -110,7 +110,12 @@ _sd_pure_ static __inline__ int sd_id128_is_null(sd_id128_t a) {
return a.qwords[0] == 0 && a.qwords[1] == 0;
}
_sd_pure_ static __inline__ int sd_id128_is_allf(sd_id128_t a) {
return a.qwords[0] == UINT64_C(0xFFFFFFFFFFFFFFFF) && a.qwords[1] == UINT64_C(0xFFFFFFFFFFFFFFFF);
}
#define SD_ID128_NULL ((const sd_id128_t) { .qwords = { 0, 0 }})
#define SD_ID128_ALLF ((const sd_id128_t) { .qwords = { UINT64_C(0xFFFFFFFFFFFFFFFF), UINT64_C(0xFFFFFFFFFFFFFFFF) }})
_SD_END_DECLARATIONS;