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Add to_bin() and to_oct().

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This commit introduces functions for converting numbers to their
equivalent binary and octal representations.  Also, the base
conversion code for these functions and to_hex() has been moved to
a common helper function.

Co-authored-by: Eric Radman
Reviewed-by: Ian Barwick, Dag Lem, Vignesh C, Tom Lane, Peter Eisentraut, Kirk Wolak, Vik Fearing, John Naylor, Dean Rasheed
Discussion: https://postgr.es/m/Y6IyTQQ/TsD5wnsH%40vm3.eradman.com
This commit is contained in:
Nathan Bossart
2023-08-23 07:49:03 -07:00
parent ccadf73163
commit 260a1f18da
5 changed files with 212 additions and 38 deletions
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59
doc/src/sgml/func.sgml
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@ -3737,6 +3737,32 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>to_bin</primary>
</indexterm>
<function>to_bin</function> ( <type>integer</type> )
<returnvalue>text</returnvalue>
</para>
<para role="func_signature">
<function>to_bin</function> ( <type>bigint</type> )
<returnvalue>text</returnvalue>
</para>
<para>
Converts the number to its equivalent two's complement binary
representation.
</para>
<para>
<literal>to_bin(2147483647)</literal>
<returnvalue>1111111111111111111111111111111</returnvalue>
</para>
<para>
<literal>to_bin(-1234)</literal>
<returnvalue>11111111111111111111101100101110</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
@ -3750,11 +3776,42 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>
<returnvalue>text</returnvalue>
</para>
<para>
Converts the number to its equivalent hexadecimal representation.
Converts the number to its equivalent two's complement hexadecimal
representation.
</para>
<para>
<literal>to_hex(2147483647)</literal>
<returnvalue>7fffffff</returnvalue>
</para>
<para>
<literal>to_hex(-1234)</literal>
<returnvalue>fffffb2e</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>to_oct</primary>
</indexterm>
<function>to_oct</function> ( <type>integer</type> )
<returnvalue>text</returnvalue>
</para>
<para role="func_signature">
<function>to_oct</function> ( <type>bigint</type> )
<returnvalue>text</returnvalue>
</para>
<para>
Converts the number to its equivalent two's complement octal
representation.
</para>
<para>
<literal>to_oct(2147483647)</literal>
<returnvalue>17777777777</returnvalue>
</para>
<para>
<literal>to_oct(-1234)</literal>
<returnvalue>37777775456</returnvalue>
</para></entry>
</row>