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sd-id128: add convenience functions to compare multiple sd_id128_t
Similar to sd_bus_error_has_names() that was added in
2b07ec316a
.
It is made inline in the hope that the compiler will be able to optimize
all the va_args boilerplate away, and do an efficient comparison when
the arguments are all constants.
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parent
78aa5b6f59
commit
64b21afc72
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@ -128,6 +128,9 @@ manpages = [
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'SD_ID128_NULL',
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'SD_ID128_UUID_FORMAT_STR',
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'sd_id128_equal',
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'sd_id128_in_set',
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'sd_id128_in_set_sentinel',
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'sd_id128_in_setv',
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'sd_id128_is_allf',
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'sd_id128_is_null',
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'sd_id128_t'],
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@ -27,6 +27,9 @@
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<refname>SD_ID128_NULL</refname>
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<refname>SD_ID128_UUID_FORMAT_STR</refname>
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<refname>sd_id128_equal</refname>
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<refname>sd_id128_in_set</refname>
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<refname>sd_id128_in_set_sentinel</refname>
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<refname>sd_id128_in_setv</refname>
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<refname>sd_id128_is_allf</refname>
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<refname>sd_id128_is_null</refname>
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<refname>sd_id128_t</refname>
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@ -148,6 +151,32 @@ int main(int argc, char **argv) {
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<programlisting>assert(sd_id128_is_allf(SD_ID128_ALLF));</programlisting>
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<para>For convenience, <function>sd_id128_in_set()</function> takes a list of IDs and
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returns true if any are equal to the first argument:</para>
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<programlisting>int main(int argc, char *argv[]) {
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sd_id12_t a = SD_ID128_MAKE(ee,89,be,71,bd,6e,43,d6,91,e6,c5,5d,eb,03,02,07);
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assert(sd_id128_in_set(a, a));
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assert(sd_id128_in_set(a, a, a));
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assert(!sd_id128_in_set(a));
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assert(!sd_id128_in_set(a,
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SD_ID128_MAKE(f2,28,88,9c,5f,09,44,15,9d,d7,04,77,58,cb,e7,3e)
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SD_ID128_MAKE(2f,88,28,5f,9c,44,09,9d,d7,15,77,04,bc,85,7e,e3)
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SD_ID128_ALLF));
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return 0;
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}
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</programlisting>
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<para><function>sd_id128_in_set()</function> is defined as a macro over
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<function>sd_id128_in_set_sentinel()</function>, adding the <constant>SD_ID128_NULL</constant>
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sentinel. Since <function>sd_id128_in_set_sentinel()</function> uses <constant>SD_ID128_NULL</constant>
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as the sentinel, <constant>SD_ID128_NULL</constant> cannot be otherwise placed in the argument list.
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</para>
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<para><function>sd_id128_in_setv()</function> is similar to
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<function>sd_id128_in_set_sentinel()</function>, but takes a <structname>struct varargs</structname>
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argument.</para>
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<para>Note that new, randomized IDs may be generated with
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<citerefentry><refentrytitle>systemd-id128</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>new</command> command.</para>
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@ -18,6 +18,7 @@
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***/
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#include <inttypes.h>
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#include <stdarg.h>
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#include <string.h>
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#include "_sd-common.h"
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@ -119,6 +120,32 @@ _sd_pure_ static __inline__ int sd_id128_is_allf(sd_id128_t a) {
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#define SD_ID128_NULL ((const sd_id128_t) { .qwords = { 0, 0 }})
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#define SD_ID128_ALLF ((const sd_id128_t) { .qwords = { UINT64_C(0xFFFFFFFFFFFFFFFF), UINT64_C(0xFFFFFFFFFFFFFFFF) }})
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_sd_pure_ static __inline__ int sd_id128_in_setv(sd_id128_t a, va_list ap) {
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for (;;) {
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sd_id128_t b = va_arg(ap, sd_id128_t);
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if (sd_id128_is_null(b))
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return 0;
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if (sd_id128_equal(a, b))
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return 1;
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}
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}
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_sd_pure_ static __inline__ int sd_id128_in_set_sentinel(sd_id128_t a, ...) {
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va_list ap;
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int r;
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va_start(ap, a);
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r = sd_id128_in_setv(a, ap);
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va_end(ap);
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return r;
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}
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#define sd_id128_in_set(a, ...) \
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sd_id128_in_set_sentinel(a, ##__VA_ARGS__, SD_ID128_NULL)
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_SD_END_DECLARATIONS;
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#endif
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@ -31,6 +31,13 @@ int main(int argc, char *argv[]) {
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assert_se(sd_id128_from_string(t, &id2) == 0);
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assert_se(sd_id128_equal(id, id2));
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assert_se(sd_id128_in_set(id, id));
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assert_se(sd_id128_in_set(id, id2));
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assert_se(sd_id128_in_set(id, id2, id));
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assert_se(sd_id128_in_set(id, ID128_WALDI, id));
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assert_se(!sd_id128_in_set(id));
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assert_se(!sd_id128_in_set(id, ID128_WALDI));
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assert_se(!sd_id128_in_set(id, ID128_WALDI, ID128_WALDI));
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if (sd_booted() > 0) {
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assert_se(sd_id128_get_machine(&id) == 0);
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