diff options
Diffstat (limited to 'man')
| -rw-r--r-- | man/sd-id128.xml | 41 |
1 files changed, 26 insertions, 15 deletions
diff --git a/man/sd-id128.xml b/man/sd-id128.xml index ea7972055d..5f24feff8e 100644 --- a/man/sd-id128.xml +++ b/man/sd-id128.xml @@ -47,10 +47,12 @@ <refname>sd-id128</refname> <refname>sd_id128_t</refname> <refname>SD_ID128_MAKE</refname> + <refname>SD_ID128_NULL</refname> <refname>SD_ID128_CONST_STR</refname> <refname>SD_ID128_FORMAT_STR</refname> <refname>SD_ID128_FORMAT_VAL</refname> <refname>sd_id128_equal</refname> + <refname>sd_id128_is_null</refname> <refpurpose>APIs for processing 128-bit IDs</refpurpose> </refnamediv> @@ -88,8 +90,8 @@ union type:</para> <programlisting>typedef union sd_id128 { - uint8_t bytes[16]; - uint64_t qwords[2]; + uint8_t bytes[16]; + uint64_t qwords[2]; } sd_id128_t;</programlisting> <para>This union type allows accessing the 128-bit ID as 16 @@ -108,37 +110,46 @@ <programlisting>#define SD_MESSAGE_COREDUMP SD_ID128_MAKE(fc,2e,22,bc,6e,e6,47,b6,b9,07,29,ab,34,a2,50,b1)</programlisting> + <para><function>SD_ID128_NULL</function> may be used to refer to the 128bit ID consisting of only NUL + bytes.</para> + <para><function>SD_ID128_CONST_STR()</function> may be used to convert constant 128-bit IDs into constant strings for output. The following example code will output the string "fc2e22bc6ee647b6b90729ab34a250b1":</para> <programlisting>int main(int argc, char *argv[]) { - puts(SD_ID128_CONST_STR(SD_MESSAGE_COREDUMP)); + puts(SD_ID128_CONST_STR(SD_MESSAGE_COREDUMP)); }</programlisting> - <para><function>SD_ID128_FORMAT_STR</function> and + <para><function>SD_ID128_FORMAT_STR()</function> and <function>SD_ID128_FORMAT_VAL()</function> may be used to format a 128-bit ID in a <citerefentry project='man-pages'><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry> format string, as shown in the following example:</para> <programlisting>int main(int argc, char *argv[]) { - sd_id128_t id; - id = SD_ID128_MAKE(ee,89,be,71,bd,6e,43,d6,91,e6,c5,5d,eb,03,02,07); - printf("The ID encoded in this C file is " SD_ID128_FORMAT_STR ".\n", SD_ID128_FORMAT_VAL(id)); - return 0; + sd_id128_t id; + id = SD_ID128_MAKE(ee,89,be,71,bd,6e,43,d6,91,e6,c5,5d,eb,03,02,07); + printf("The ID encoded in this C file is " SD_ID128_FORMAT_STR ".\n", SD_ID128_FORMAT_VAL(id)); + return 0; }</programlisting> <para>Use <function>sd_id128_equal()</function> to compare two 128-bit IDs:</para> <programlisting>int main(int argc, char *argv[]) { - sd_id128_t a, b, c; - a = SD_ID128_MAKE(ee,89,be,71,bd,6e,43,d6,91,e6,c5,5d,eb,03,02,07); - b = SD_ID128_MAKE(f2,28,88,9c,5f,09,44,15,9d,d7,04,77,58,cb,e7,3e); - c = a; - assert(sd_id128_equal(a, c)); - assert(!sd_id128_equal(a, b)); - return 0; + sd_id128_t a, b, c; + a = SD_ID128_MAKE(ee,89,be,71,bd,6e,43,d6,91,e6,c5,5d,eb,03,02,07); + b = SD_ID128_MAKE(f2,28,88,9c,5f,09,44,15,9d,d7,04,77,58,cb,e7,3e); + c = a; + assert(sd_id128_equal(a, c)); + assert(!sd_id128_equal(a, b)); + return 0; +}</programlisting> + + <para>Use <function>sd_id128_is_null()</function> to check if an 128bit ID consists of only NUL bytes:</para> + + <programlisting>int main(int argc, char *argv[]) { + assert(sd_id128_is_null(SD_ID128_NULL)); }</programlisting> <para>Note that new, randomized IDs may be generated with |