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Add get_bit/set_bit functions for bit strings, paralleling those for bytea,
and implement OVERLAY() for bit strings and bytea. In passing also convert text OVERLAY() to a true built-in, instead of relying on a SQL function. Leonardo F, reviewed by Kevin Grittner
This commit is contained in:
Tom Lane
parent
1d1f425f8d
commit
9507c8a1db
@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.497 2010/01/19 05:50:18 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.498 2010/01/25 20:55:32 tgl Exp $ -->
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<chapter id="functions">
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<title>Functions and Operators</title>
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@ -2620,7 +2620,7 @@
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<entry>Return Type</entry>
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<entry>Description</entry>
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<entry>Example</entry>
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<entry>Result</entry>
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<entry>Result</entry>
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</row>
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</thead>
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@ -2640,32 +2640,6 @@
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<entry><literal>\\Post'gres\000</literal></entry>
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</row>
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<row>
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<entry><function>get_bit</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</entry>
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<entry><type>int</type></entry>
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<entry>
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Extract bit from string
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<indexterm>
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<primary>get_bit</primary>
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</indexterm>
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</entry>
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<entry><literal>get_bit(E'Th\\000omas'::bytea, 45)</literal></entry>
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<entry><literal>1</literal></entry>
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</row>
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<row>
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<entry><function>get_byte</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</entry>
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<entry><type>int</type></entry>
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<entry>
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Extract byte from string
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<indexterm>
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<primary>get_byte</primary>
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</indexterm>
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</entry>
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<entry><literal>get_byte(E'Th\\000omas'::bytea, 4)</literal></entry>
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<entry><literal>109</literal></entry>
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</row>
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<row>
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<entry><literal><function>octet_length</function>(<parameter>string</parameter>)</literal></entry>
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<entry><type>int</type></entry>
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@ -2674,6 +2648,16 @@
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<entry><literal>5</literal></entry>
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</row>
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<row>
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<entry><literal><function>overlay</function>(<parameter>string</parameter> placing <parameter>string</parameter> from <type>int</type> <optional>for <type>int</type></optional>)</literal></entry>
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<entry><type>bytea</type></entry>
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<entry>
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Replace substring
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</entry>
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<entry><literal>overlay(E'Th\\000omas'::bytea placing E'\\002\\003'::bytea from 2 for 3)</literal></entry>
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<entry><literal>T\\002\\003mas</literal></entry>
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</row>
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<row>
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<entry><literal><function>position</function>(<parameter>substring</parameter> in <parameter>string</parameter>)</literal></entry>
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<entry><type>int</type></entry>
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@ -2682,34 +2666,6 @@
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<entry><literal>3</literal></entry>
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</row>
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<row>
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<entry><function>set_bit</function>(<parameter>string</parameter>,
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<parameter>offset</parameter>, <parameter>newvalue</>)</entry>
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<entry><type>bytea</type></entry>
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<entry>
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Set bit in string
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<indexterm>
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<primary>set_bit</primary>
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</indexterm>
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</entry>
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<entry><literal>set_bit(E'Th\\000omas'::bytea, 45, 0)</literal></entry>
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<entry><literal>Th\000omAs</literal></entry>
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</row>
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<row>
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<entry><function>set_byte</function>(<parameter>string</parameter>,
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<parameter>offset</parameter>, <parameter>newvalue</>)</entry>
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<entry><type>bytea</type></entry>
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<entry>
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Set byte in string
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<indexterm>
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<primary>set_byte</primary>
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</indexterm>
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</entry>
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<entry><literal>set_byte(E'Th\\000omas'::bytea, 4, 64)</literal></entry>
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<entry><literal>Th\000o@as</literal></entry>
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</row>
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<row>
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<entry><literal><function>substring</function>(<parameter>string</parameter> <optional>from <type>int</type></optional> <optional>for <type>int</type></optional>)</literal></entry>
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<entry><type>bytea</type></entry>
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@ -2784,7 +2740,7 @@
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</entry>
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<entry><type>bytea</type></entry>
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<entry>
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Decode binary string from <parameter>string</parameter> previously
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Decode binary string from <parameter>string</parameter> previously
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encoded with <function>encode</>. Parameter type is same as in <function>encode</>.
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</entry>
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<entry><literal>decode(E'123\\000456', 'escape')</literal></entry>
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@ -2805,6 +2761,36 @@
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<entry><literal>123\000456</literal></entry>
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</row>
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<row>
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<entry>
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<literal><function>get_bit</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</literal>
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</entry>
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<entry><type>int</type></entry>
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<entry>
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Extract bit from string
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<indexterm>
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<primary>get_bit</primary>
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</indexterm>
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</entry>
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<entry><literal>get_bit(E'Th\\000omas'::bytea, 45)</literal></entry>
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<entry><literal>1</literal></entry>
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</row>
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<row>
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<entry>
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<literal><function>get_byte</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</literal>
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</entry>
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<entry><type>int</type></entry>
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<entry>
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Extract byte from string
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<indexterm>
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<primary>get_byte</primary>
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</indexterm>
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</entry>
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<entry><literal>get_byte(E'Th\\000omas'::bytea, 4)</literal></entry>
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<entry><literal>109</literal></entry>
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</row>
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<row>
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<entry><literal><function>length</function>(<parameter>string</parameter>)</literal></entry>
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<entry><type>int</type></entry>
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@ -2834,6 +2820,38 @@
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<entry><literal>md5(E'Th\\000omas'::bytea)</literal></entry>
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<entry><literal>8ab2d3c9689aaf18 b4958c334c82d8b1</literal></entry>
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</row>
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<row>
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<entry>
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<literal><function>set_bit</function>(<parameter>string</parameter>,
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<parameter>offset</parameter>, <parameter>newvalue</>)</literal>
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</entry>
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<entry><type>bytea</type></entry>
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<entry>
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Set bit in string
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<indexterm>
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<primary>set_bit</primary>
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</indexterm>
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</entry>
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<entry><literal>set_bit(E'Th\\000omas'::bytea, 45, 0)</literal></entry>
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<entry><literal>Th\000omAs</literal></entry>
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</row>
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<row>
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<entry>
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<literal><function>set_byte</function>(<parameter>string</parameter>,
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<parameter>offset</parameter>, <parameter>newvalue</>)</literal>
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</entry>
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<entry><type>bytea</type></entry>
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<entry>
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Set byte in string
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<indexterm>
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<primary>set_byte</primary>
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</indexterm>
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</entry>
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<entry><literal>set_byte(E'Th\\000omas'::bytea, 4, 64)</literal></entry>
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<entry><literal>Th\000o@as</literal></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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@ -2934,7 +2952,15 @@
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<literal><function>bit_length</function></literal>,
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<literal><function>octet_length</function></literal>,
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<literal><function>position</function></literal>,
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<literal><function>substring</function></literal>.
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<literal><function>substring</function></literal>,
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<literal><function>overlay</function></literal>.
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</para>
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<para>
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The following functions work on bit strings as well as binary
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strings:
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<literal><function>get_bit</function></literal>,
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<literal><function>set_bit</function></literal>.
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</para>
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<para>
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@ -11,7 +11,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.704 2010/01/22 16:40:18 rhaas Exp $
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* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.705 2010/01/25 20:55:32 tgl Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -9586,9 +9586,9 @@ func_expr: func_name '(' ')' over_clause
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| OVERLAY '(' overlay_list ')'
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{
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/* overlay(A PLACING B FROM C FOR D) is converted to
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* substring(A, 1, C-1) || B || substring(A, C+1, C+D)
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* overlay(A, B, C, D)
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* overlay(A PLACING B FROM C) is converted to
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* substring(A, 1, C-1) || B || substring(A, C+1, C+char_length(B))
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* overlay(A, B, C)
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*/
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FuncCall *n = makeNode(FuncCall);
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n->funcname = SystemFuncName("overlay");
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@ -10150,6 +10150,7 @@ extract_arg:
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* SQL99 defines the OVERLAY() function:
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* o overlay(text placing text from int for int)
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* o overlay(text placing text from int)
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* and similarly for binary strings
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*/
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overlay_list:
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a_expr overlay_placing substr_from substr_for
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@ -9,7 +9,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/varbit.c,v 1.63 2010/01/07 20:17:43 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/varbit.c,v 1.64 2010/01/25 20:55:32 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -23,8 +23,10 @@
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#define HEXDIG(z) ((z)<10 ? ((z)+'0') : ((z)-10+'A'))
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static VarBit *bit_catenate(VarBit *arg1, VarBit *arg2);
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static VarBit *bitsubstring(VarBit *arg, int32 s, int32 l,
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bool length_not_specified);
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static VarBit *bit_overlay(VarBit *t1, VarBit *t2, int sp, int sl);
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/* common code for bittypmodin and varbittypmodin */
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@ -877,6 +879,13 @@ bitcat(PG_FUNCTION_ARGS)
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{
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VarBit *arg1 = PG_GETARG_VARBIT_P(0);
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VarBit *arg2 = PG_GETARG_VARBIT_P(1);
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PG_RETURN_VARBIT_P(bit_catenate(arg1, arg2));
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}
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static VarBit *
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bit_catenate(VarBit *arg1, VarBit *arg2)
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{
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VarBit *result;
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int bitlen1,
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bitlen2,
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@ -919,7 +928,7 @@ bitcat(PG_FUNCTION_ARGS)
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}
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}
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PG_RETURN_VARBIT_P(result);
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return result;
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}
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/* bitsubstr
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@ -1034,6 +1043,67 @@ bitsubstring(VarBit *arg, int32 s, int32 l, bool length_not_specified)
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return result;
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}
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/*
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* bitoverlay
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* Replace specified substring of first string with second
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*
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* The SQL standard defines OVERLAY() in terms of substring and concatenation.
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* This code is a direct implementation of what the standard says.
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*/
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Datum
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bitoverlay(PG_FUNCTION_ARGS)
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{
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VarBit *t1 = PG_GETARG_VARBIT_P(0);
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VarBit *t2 = PG_GETARG_VARBIT_P(1);
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int sp = PG_GETARG_INT32(2); /* substring start position */
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int sl = PG_GETARG_INT32(3); /* substring length */
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PG_RETURN_VARBIT_P(bit_overlay(t1, t2, sp, sl));
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}
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Datum
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bitoverlay_no_len(PG_FUNCTION_ARGS)
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{
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VarBit *t1 = PG_GETARG_VARBIT_P(0);
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VarBit *t2 = PG_GETARG_VARBIT_P(1);
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int sp = PG_GETARG_INT32(2); /* substring start position */
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int sl;
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sl = VARBITLEN(t2); /* defaults to length(t2) */
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PG_RETURN_VARBIT_P(bit_overlay(t1, t2, sp, sl));
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}
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static VarBit *
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bit_overlay(VarBit *t1, VarBit *t2, int sp, int sl)
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{
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VarBit *result;
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VarBit *s1;
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VarBit *s2;
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int sp_pl_sl;
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/*
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* Check for possible integer-overflow cases. For negative sp,
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* throw a "substring length" error because that's what should be
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* expected according to the spec's definition of OVERLAY().
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*/
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if (sp <= 0)
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ereport(ERROR,
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(errcode(ERRCODE_SUBSTRING_ERROR),
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errmsg("negative substring length not allowed")));
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sp_pl_sl = sp + sl;
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if (sp_pl_sl <= sl)
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ereport(ERROR,
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(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
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errmsg("integer out of range")));
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s1 = bitsubstring(t1, 1, sp-1, false);
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s2 = bitsubstring(t1, sp_pl_sl, -1, true);
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result = bit_catenate(s1, t2);
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result = bit_catenate(result, s2);
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return result;
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}
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/* bitlength, bitoctetlength
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* Return the length of a bit string
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*/
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@ -1606,3 +1676,103 @@ bitposition(PG_FUNCTION_ARGS)
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}
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PG_RETURN_INT32(0);
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}
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/*
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* bitsetbit
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*
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* Given an instance of type 'bit' creates a new one with
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* the Nth bit set to the given value.
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*
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* The bit location is specified left-to-right in a zero-based fashion
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* consistent with the other get_bit and set_bit functions, but
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* inconsistent with the standard substring, position, overlay functions
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*/
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Datum
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bitsetbit(PG_FUNCTION_ARGS)
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{
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VarBit *arg1 = PG_GETARG_VARBIT_P(0);
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int32 n = PG_GETARG_INT32(1);
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int32 newBit = PG_GETARG_INT32(2);
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VarBit *result;
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int len,
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bitlen;
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bits8 *r,
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*p;
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int byteNo,
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bitNo;
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bitlen = VARBITLEN(arg1);
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if (n < 0 || n >= bitlen)
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ereport(ERROR,
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(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
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errmsg("bit index %d out of valid range (0..%d)",
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n, bitlen - 1)));
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/*
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* sanity check!
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*/
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if (newBit != 0 && newBit != 1)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("new bit must be 0 or 1")));
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len = VARSIZE(arg1);
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result = (VarBit *) palloc(len);
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SET_VARSIZE(result, len);
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VARBITLEN(result) = bitlen;
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p = VARBITS(arg1);
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r = VARBITS(result);
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memcpy(r, p, VARBITBYTES(arg1));
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byteNo = n / BITS_PER_BYTE;
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bitNo = BITS_PER_BYTE - 1 - (n % BITS_PER_BYTE);
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/*
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* Update the byte.
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*/
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if (newBit == 0)
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r[byteNo] &= (~(1 << bitNo));
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else
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r[byteNo] |= (1 << bitNo);
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PG_RETURN_VARBIT_P(result);
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}
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/*
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* bitgetbit
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*
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* returns the value of the Nth bit of a bit array (0 or 1).
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*
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* The bit location is specified left-to-right in a zero-based fashion
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* consistent with the other get_bit and set_bit functions, but
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* inconsistent with the standard substring, position, overlay functions
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*/
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Datum
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bitgetbit(PG_FUNCTION_ARGS)
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{
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VarBit *arg1 = PG_GETARG_VARBIT_P(0);
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int32 n = PG_GETARG_INT32(1);
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int bitlen;
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bits8 *p;
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int byteNo,
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bitNo;
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bitlen = VARBITLEN(arg1);
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if (n < 0 || n >= bitlen)
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ereport(ERROR,
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(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
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errmsg("bit index %d out of valid range (0..%d)",
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n, bitlen - 1)));
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p = VARBITS(arg1);
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byteNo = n / BITS_PER_BYTE;
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bitNo = BITS_PER_BYTE - 1 - (n % BITS_PER_BYTE);
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if (p[byteNo] & (1 << bitNo))
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PG_RETURN_INT32(1);
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else
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PG_RETURN_INT32(0);
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}
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/varlena.c,v 1.173 2010/01/02 16:57:55 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/varlena.c,v 1.174 2010/01/25 20:55:32 tgl Exp $
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*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -60,11 +60,19 @@ static int text_position(text *t1, text *t2);
|
||||
static void text_position_setup(text *t1, text *t2, TextPositionState *state);
|
||||
static int text_position_next(int start_pos, TextPositionState *state);
|
||||
static void text_position_cleanup(TextPositionState *state);
|
||||
static text *text_catenate(text *t1, text *t2);
|
||||
static text *text_substring(Datum str,
|
||||
int32 start,
|
||||
int32 length,
|
||||
bool length_not_specified);
|
||||
static text *text_overlay(text *t1, text *t2, int sp, int sl);
|
||||
static void appendStringInfoText(StringInfo str, const text *t);
|
||||
static bytea *bytea_catenate(bytea *t1, bytea *t2);
|
||||
static bytea *bytea_substring(Datum str,
|
||||
int S,
|
||||
int L,
|
||||
bool length_not_specified);
|
||||
static bytea *bytea_overlay(bytea *t1, bytea *t2, int sp, int sl);
|
||||
|
||||
|
||||
/*****************************************************************************
|
||||
@ -559,17 +567,31 @@ textcat(PG_FUNCTION_ARGS)
|
||||
{
|
||||
text *t1 = PG_GETARG_TEXT_PP(0);
|
||||
text *t2 = PG_GETARG_TEXT_PP(1);
|
||||
|
||||
PG_RETURN_TEXT_P(text_catenate(t1, t2));
|
||||
}
|
||||
|
||||
/*
|
||||
* text_catenate
|
||||
* Guts of textcat(), broken out so it can be used by other functions
|
||||
*
|
||||
* Arguments can be in short-header form, but not compressed or out-of-line
|
||||
*/
|
||||
static text *
|
||||
text_catenate(text *t1, text *t2)
|
||||
{
|
||||
text *result;
|
||||
int len1,
|
||||
len2,
|
||||
len;
|
||||
text *result;
|
||||
char *ptr;
|
||||
|
||||
len1 = VARSIZE_ANY_EXHDR(t1);
|
||||
len2 = VARSIZE_ANY_EXHDR(t2);
|
||||
|
||||
/* paranoia ... probably should throw error instead? */
|
||||
if (len1 < 0)
|
||||
len1 = 0;
|
||||
|
||||
len2 = VARSIZE_ANY_EXHDR(t2);
|
||||
if (len2 < 0)
|
||||
len2 = 0;
|
||||
|
||||
@ -586,7 +608,7 @@ textcat(PG_FUNCTION_ARGS)
|
||||
if (len2 > 0)
|
||||
memcpy(ptr + len1, VARDATA_ANY(t2), len2);
|
||||
|
||||
PG_RETURN_TEXT_P(result);
|
||||
return result;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -865,6 +887,67 @@ text_substring(Datum str, int32 start, int32 length, bool length_not_specified)
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* textoverlay
|
||||
* Replace specified substring of first string with second
|
||||
*
|
||||
* The SQL standard defines OVERLAY() in terms of substring and concatenation.
|
||||
* This code is a direct implementation of what the standard says.
|
||||
*/
|
||||
Datum
|
||||
textoverlay(PG_FUNCTION_ARGS)
|
||||
{
|
||||
text *t1 = PG_GETARG_TEXT_PP(0);
|
||||
text *t2 = PG_GETARG_TEXT_PP(1);
|
||||
int sp = PG_GETARG_INT32(2); /* substring start position */
|
||||
int sl = PG_GETARG_INT32(3); /* substring length */
|
||||
|
||||
PG_RETURN_TEXT_P(text_overlay(t1, t2, sp, sl));
|
||||
}
|
||||
|
||||
Datum
|
||||
textoverlay_no_len(PG_FUNCTION_ARGS)
|
||||
{
|
||||
text *t1 = PG_GETARG_TEXT_PP(0);
|
||||
text *t2 = PG_GETARG_TEXT_PP(1);
|
||||
int sp = PG_GETARG_INT32(2); /* substring start position */
|
||||
int sl;
|
||||
|
||||
sl = text_length(PointerGetDatum(t2)); /* defaults to length(t2) */
|
||||
PG_RETURN_TEXT_P(text_overlay(t1, t2, sp, sl));
|
||||
}
|
||||
|
||||
static text *
|
||||
text_overlay(text *t1, text *t2, int sp, int sl)
|
||||
{
|
||||
text *result;
|
||||
text *s1;
|
||||
text *s2;
|
||||
int sp_pl_sl;
|
||||
|
||||
/*
|
||||
* Check for possible integer-overflow cases. For negative sp,
|
||||
* throw a "substring length" error because that's what should be
|
||||
* expected according to the spec's definition of OVERLAY().
|
||||
*/
|
||||
if (sp <= 0)
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_SUBSTRING_ERROR),
|
||||
errmsg("negative substring length not allowed")));
|
||||
sp_pl_sl = sp + sl;
|
||||
if (sp_pl_sl <= sl)
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
|
||||
errmsg("integer out of range")));
|
||||
|
||||
s1 = text_substring(PointerGetDatum(t1), 1, sp-1, false);
|
||||
s2 = text_substring(PointerGetDatum(t1), sp_pl_sl, -1, true);
|
||||
result = text_catenate(s1, t2);
|
||||
result = text_catenate(result, s2);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/*
|
||||
* textpos -
|
||||
* Return the position of the specified substring.
|
||||
@ -1640,17 +1723,31 @@ byteacat(PG_FUNCTION_ARGS)
|
||||
{
|
||||
bytea *t1 = PG_GETARG_BYTEA_PP(0);
|
||||
bytea *t2 = PG_GETARG_BYTEA_PP(1);
|
||||
|
||||
PG_RETURN_BYTEA_P(bytea_catenate(t1, t2));
|
||||
}
|
||||
|
||||
/*
|
||||
* bytea_catenate
|
||||
* Guts of byteacat(), broken out so it can be used by other functions
|
||||
*
|
||||
* Arguments can be in short-header form, but not compressed or out-of-line
|
||||
*/
|
||||
static bytea *
|
||||
bytea_catenate(bytea *t1, bytea *t2)
|
||||
{
|
||||
bytea *result;
|
||||
int len1,
|
||||
len2,
|
||||
len;
|
||||
bytea *result;
|
||||
char *ptr;
|
||||
|
||||
len1 = VARSIZE_ANY_EXHDR(t1);
|
||||
len2 = VARSIZE_ANY_EXHDR(t2);
|
||||
|
||||
/* paranoia ... probably should throw error instead? */
|
||||
if (len1 < 0)
|
||||
len1 = 0;
|
||||
|
||||
len2 = VARSIZE_ANY_EXHDR(t2);
|
||||
if (len2 < 0)
|
||||
len2 = 0;
|
||||
|
||||
@ -1667,7 +1764,7 @@ byteacat(PG_FUNCTION_ARGS)
|
||||
if (len2 > 0)
|
||||
memcpy(ptr + len1, VARDATA_ANY(t2), len2);
|
||||
|
||||
PG_RETURN_BYTEA_P(result);
|
||||
return result;
|
||||
}
|
||||
|
||||
#define PG_STR_GET_BYTEA(str_) \
|
||||
@ -1691,16 +1788,41 @@ byteacat(PG_FUNCTION_ARGS)
|
||||
Datum
|
||||
bytea_substr(PG_FUNCTION_ARGS)
|
||||
{
|
||||
int S = PG_GETARG_INT32(1); /* start position */
|
||||
PG_RETURN_BYTEA_P(bytea_substring(PG_GETARG_DATUM(0),
|
||||
PG_GETARG_INT32(1),
|
||||
PG_GETARG_INT32(2),
|
||||
false));
|
||||
}
|
||||
|
||||
/*
|
||||
* bytea_substr_no_len -
|
||||
* Wrapper to avoid opr_sanity failure due to
|
||||
* one function accepting a different number of args.
|
||||
*/
|
||||
Datum
|
||||
bytea_substr_no_len(PG_FUNCTION_ARGS)
|
||||
{
|
||||
PG_RETURN_BYTEA_P(bytea_substring(PG_GETARG_DATUM(0),
|
||||
PG_GETARG_INT32(1),
|
||||
-1,
|
||||
true));
|
||||
}
|
||||
|
||||
static bytea *
|
||||
bytea_substring(Datum str,
|
||||
int S,
|
||||
int L,
|
||||
bool length_not_specified)
|
||||
{
|
||||
int S1; /* adjusted start position */
|
||||
int L1; /* adjusted substring length */
|
||||
|
||||
S1 = Max(S, 1);
|
||||
|
||||
if (fcinfo->nargs == 2)
|
||||
if (length_not_specified)
|
||||
{
|
||||
/*
|
||||
* Not passed a length - PG_GETARG_BYTEA_P_SLICE() grabs everything to
|
||||
* Not passed a length - DatumGetByteaPSlice() grabs everything to
|
||||
* the end of the string if we pass it a negative value for length.
|
||||
*/
|
||||
L1 = -1;
|
||||
@ -1708,7 +1830,7 @@ bytea_substr(PG_FUNCTION_ARGS)
|
||||
else
|
||||
{
|
||||
/* end position */
|
||||
int E = S + PG_GETARG_INT32(2);
|
||||
int E = S + L;
|
||||
|
||||
/*
|
||||
* A negative value for L is the only way for the end position to be
|
||||
@ -1725,28 +1847,78 @@ bytea_substr(PG_FUNCTION_ARGS)
|
||||
* string.
|
||||
*/
|
||||
if (E < 1)
|
||||
PG_RETURN_BYTEA_P(PG_STR_GET_BYTEA(""));
|
||||
return PG_STR_GET_BYTEA("");
|
||||
|
||||
L1 = E - S1;
|
||||
}
|
||||
|
||||
/*
|
||||
* If the start position is past the end of the string, SQL99 says to
|
||||
* return a zero-length string -- PG_GETARG_TEXT_P_SLICE() will do that
|
||||
* return a zero-length string -- DatumGetByteaPSlice() will do that
|
||||
* for us. Convert to zero-based starting position
|
||||
*/
|
||||
PG_RETURN_BYTEA_P(PG_GETARG_BYTEA_P_SLICE(0, S1 - 1, L1));
|
||||
return DatumGetByteaPSlice(str, S1 - 1, L1);
|
||||
}
|
||||
|
||||
/*
|
||||
* bytea_substr_no_len -
|
||||
* Wrapper to avoid opr_sanity failure due to
|
||||
* one function accepting a different number of args.
|
||||
* byteaoverlay
|
||||
* Replace specified substring of first string with second
|
||||
*
|
||||
* The SQL standard defines OVERLAY() in terms of substring and concatenation.
|
||||
* This code is a direct implementation of what the standard says.
|
||||
*/
|
||||
Datum
|
||||
bytea_substr_no_len(PG_FUNCTION_ARGS)
|
||||
byteaoverlay(PG_FUNCTION_ARGS)
|
||||
{
|
||||
return bytea_substr(fcinfo);
|
||||
bytea *t1 = PG_GETARG_BYTEA_PP(0);
|
||||
bytea *t2 = PG_GETARG_BYTEA_PP(1);
|
||||
int sp = PG_GETARG_INT32(2); /* substring start position */
|
||||
int sl = PG_GETARG_INT32(3); /* substring length */
|
||||
|
||||
PG_RETURN_BYTEA_P(bytea_overlay(t1, t2, sp, sl));
|
||||
}
|
||||
|
||||
Datum
|
||||
byteaoverlay_no_len(PG_FUNCTION_ARGS)
|
||||
{
|
||||
bytea *t1 = PG_GETARG_BYTEA_PP(0);
|
||||
bytea *t2 = PG_GETARG_BYTEA_PP(1);
|
||||
int sp = PG_GETARG_INT32(2); /* substring start position */
|
||||
int sl;
|
||||
|
||||
sl = VARSIZE_ANY_EXHDR(t2); /* defaults to length(t2) */
|
||||
PG_RETURN_BYTEA_P(bytea_overlay(t1, t2, sp, sl));
|
||||
}
|
||||
|
||||
static bytea *
|
||||
bytea_overlay(bytea *t1, bytea *t2, int sp, int sl)
|
||||
{
|
||||
bytea *result;
|
||||
bytea *s1;
|
||||
bytea *s2;
|
||||
int sp_pl_sl;
|
||||
|
||||
/*
|
||||
* Check for possible integer-overflow cases. For negative sp,
|
||||
* throw a "substring length" error because that's what should be
|
||||
* expected according to the spec's definition of OVERLAY().
|
||||
*/
|
||||
if (sp <= 0)
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_SUBSTRING_ERROR),
|
||||
errmsg("negative substring length not allowed")));
|
||||
sp_pl_sl = sp + sl;
|
||||
if (sp_pl_sl <= sl)
|
||||
ereport(ERROR,
|
||||
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
|
||||
errmsg("integer out of range")));
|
||||
|
||||
s1 = bytea_substring(PointerGetDatum(t1), 1, sp-1, false);
|
||||
s2 = bytea_substring(PointerGetDatum(t1), sp_pl_sl, -1, true);
|
||||
result = bytea_catenate(s1, t2);
|
||||
result = bytea_catenate(result, s2);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/*
|
||||
|
||||
@ -37,7 +37,7 @@
|
||||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.578 2010/01/22 16:42:31 rhaas Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.579 2010/01/25 20:55:32 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -53,6 +53,6 @@
|
||||
*/
|
||||
|
||||
/* yyyymmddN */
|
||||
#define CATALOG_VERSION_NO 201001222
|
||||
#define CATALOG_VERSION_NO 201001251
|
||||
|
||||
#endif
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.564 2010/01/19 14:11:32 mha Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.565 2010/01/25 20:55:32 tgl Exp $
|
||||
*
|
||||
* NOTES
|
||||
* The script catalog/genbki.pl reads this file and generates .bki
|
||||
@ -957,6 +957,10 @@ DATA(insert OID = 723 ( get_bit PGNSP PGUID 12 1 0 0 f f f t f i 2 0 23 "17
|
||||
DESCR("get bit");
|
||||
DATA(insert OID = 724 ( set_bit PGNSP PGUID 12 1 0 0 f f f t f i 3 0 17 "17 23 23" _null_ _null_ _null_ _null_ byteaSetBit _null_ _null_ _null_ ));
|
||||
DESCR("set bit");
|
||||
DATA(insert OID = 749 ( overlay PGNSP PGUID 12 1 0 0 f f f t f i 4 0 17 "17 17 23 23" _null_ _null_ _null_ _null_ byteaoverlay _null_ _null_ _null_ ));
|
||||
DESCR("substitute portion of string");
|
||||
DATA(insert OID = 752 ( overlay PGNSP PGUID 12 1 0 0 f f f t f i 3 0 17 "17 17 23" _null_ _null_ _null_ _null_ byteaoverlay_no_len _null_ _null_ _null_ ));
|
||||
DESCR("substitute portion of string");
|
||||
|
||||
DATA(insert OID = 725 ( dist_pl PGNSP PGUID 12 1 0 0 f f f t f i 2 0 701 "600 628" _null_ _null_ _null_ _null_ dist_pl _null_ _null_ _null_ ));
|
||||
DESCR("distance between point and line");
|
||||
@ -1832,9 +1836,9 @@ DESCR("current schema name");
|
||||
DATA(insert OID = 1403 ( current_schemas PGNSP PGUID 12 1 0 0 f f f t f s 1 0 1003 "16" _null_ _null_ _null_ _null_ current_schemas _null_ _null_ _null_ ));
|
||||
DESCR("current schema search list");
|
||||
|
||||
DATA(insert OID = 1404 ( overlay PGNSP PGUID 14 1 0 0 f f f t f i 4 0 25 "25 25 23 23" _null_ _null_ _null_ _null_ "select pg_catalog.substring($1, 1, ($3 - 1)) || $2 || pg_catalog.substring($1, ($3 + $4))" _null_ _null_ _null_ ));
|
||||
DATA(insert OID = 1404 ( overlay PGNSP PGUID 12 1 0 0 f f f t f i 4 0 25 "25 25 23 23" _null_ _null_ _null_ _null_ textoverlay _null_ _null_ _null_ ));
|
||||
DESCR("substitute portion of string");
|
||||
DATA(insert OID = 1405 ( overlay PGNSP PGUID 14 1 0 0 f f f t f i 3 0 25 "25 25 23" _null_ _null_ _null_ _null_ "select pg_catalog.substring($1, 1, ($3 - 1)) || $2 || pg_catalog.substring($1, ($3 + pg_catalog.char_length($2)))" _null_ _null_ _null_ ));
|
||||
DATA(insert OID = 1405 ( overlay PGNSP PGUID 12 1 0 0 f f f t f i 3 0 25 "25 25 23" _null_ _null_ _null_ _null_ textoverlay_no_len _null_ _null_ _null_ ));
|
||||
DESCR("substitute portion of string");
|
||||
|
||||
DATA(insert OID = 1406 ( isvertical PGNSP PGUID 12 1 0 0 f f f t f i 2 0 16 "600 600" _null_ _null_ _null_ _null_ point_vert _null_ _null_ _null_ ));
|
||||
@ -2402,9 +2406,17 @@ DESCR("adjust varbit() to typmod length");
|
||||
|
||||
DATA(insert OID = 1698 ( position PGNSP PGUID 12 1 0 0 f f f t f i 2 0 23 "1560 1560" _null_ _null_ _null_ _null_ bitposition _null_ _null_ _null_ ));
|
||||
DESCR("return position of sub-bitstring");
|
||||
DATA(insert OID = 1699 ( substring PGNSP PGUID 12 1 0 0 f f f t f i 2 0 1560 "1560 23" _null_ _null_ _null_ _null_ bitsubstr_no_len _null_ _null_ _null_ ));
|
||||
DATA(insert OID = 1699 ( substring PGNSP PGUID 12 1 0 0 f f f t f i 2 0 1560 "1560 23" _null_ _null_ _null_ _null_ bitsubstr_no_len _null_ _null_ _null_ ));
|
||||
DESCR("return portion of bitstring");
|
||||
|
||||
DATA(insert OID = 3030 ( overlay PGNSP PGUID 12 1 0 0 f f f t f i 4 0 1560 "1560 1560 23 23" _null_ _null_ _null_ _null_ bitoverlay _null_ _null_ _null_ ));
|
||||
DESCR("substitute portion of bitstring");
|
||||
DATA(insert OID = 3031 ( overlay PGNSP PGUID 12 1 0 0 f f f t f i 3 0 1560 "1560 1560 23" _null_ _null_ _null_ _null_ bitoverlay_no_len _null_ _null_ _null_ ));
|
||||
DESCR("substitute portion of bitstring");
|
||||
DATA(insert OID = 3032 ( get_bit PGNSP PGUID 12 1 0 0 f f f t f i 2 0 23 "1560 23" _null_ _null_ _null_ _null_ bitgetbit _null_ _null_ _null_ ));
|
||||
DESCR("get bit");
|
||||
DATA(insert OID = 3033 ( set_bit PGNSP PGUID 12 1 0 0 f f f t f i 3 0 1560 "1560 23 23" _null_ _null_ _null_ _null_ bitsetbit _null_ _null_ _null_ ));
|
||||
DESCR("set bit");
|
||||
|
||||
/* for mac type support */
|
||||
DATA(insert OID = 436 ( macaddr_in PGNSP PGUID 12 1 0 0 f f f t f i 1 0 829 "2275" _null_ _null_ _null_ _null_ macaddr_in _null_ _null_ _null_ ));
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.344 2010/01/19 05:50:18 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.345 2010/01/25 20:55:32 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -698,6 +698,8 @@ extern Datum textoctetlen(PG_FUNCTION_ARGS);
|
||||
extern Datum textpos(PG_FUNCTION_ARGS);
|
||||
extern Datum text_substr(PG_FUNCTION_ARGS);
|
||||
extern Datum text_substr_no_len(PG_FUNCTION_ARGS);
|
||||
extern Datum textoverlay(PG_FUNCTION_ARGS);
|
||||
extern Datum textoverlay_no_len(PG_FUNCTION_ARGS);
|
||||
extern Datum name_text(PG_FUNCTION_ARGS);
|
||||
extern Datum text_name(PG_FUNCTION_ARGS);
|
||||
extern int varstr_cmp(char *arg1, int len1, char *arg2, int len2);
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/utils/bytea.h,v 1.2 2010/01/02 16:58:10 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/utils/bytea.h,v 1.3 2010/01/25 20:55:32 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -46,5 +46,7 @@ extern Datum byteacat(PG_FUNCTION_ARGS);
|
||||
extern Datum byteapos(PG_FUNCTION_ARGS);
|
||||
extern Datum bytea_substr(PG_FUNCTION_ARGS);
|
||||
extern Datum bytea_substr_no_len(PG_FUNCTION_ARGS);
|
||||
extern Datum byteaoverlay(PG_FUNCTION_ARGS);
|
||||
extern Datum byteaoverlay_no_len(PG_FUNCTION_ARGS);
|
||||
|
||||
#endif /* BYTEA_H */
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/utils/varbit.h,v 1.30 2010/01/07 20:17:44 tgl Exp $
|
||||
* $PostgreSQL: pgsql/src/include/utils/varbit.h,v 1.31 2010/01/25 20:55:32 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -89,6 +89,8 @@ extern Datum bitshiftright(PG_FUNCTION_ARGS);
|
||||
extern Datum bitcat(PG_FUNCTION_ARGS);
|
||||
extern Datum bitsubstr(PG_FUNCTION_ARGS);
|
||||
extern Datum bitsubstr_no_len(PG_FUNCTION_ARGS);
|
||||
extern Datum bitoverlay(PG_FUNCTION_ARGS);
|
||||
extern Datum bitoverlay_no_len(PG_FUNCTION_ARGS);
|
||||
extern Datum bitlength(PG_FUNCTION_ARGS);
|
||||
extern Datum bitoctetlength(PG_FUNCTION_ARGS);
|
||||
extern Datum bitfromint4(PG_FUNCTION_ARGS);
|
||||
@ -96,5 +98,7 @@ extern Datum bittoint4(PG_FUNCTION_ARGS);
|
||||
extern Datum bitfromint8(PG_FUNCTION_ARGS);
|
||||
extern Datum bittoint8(PG_FUNCTION_ARGS);
|
||||
extern Datum bitposition(PG_FUNCTION_ARGS);
|
||||
extern Datum bitsetbit(PG_FUNCTION_ARGS);
|
||||
extern Datum bitgetbit(PG_FUNCTION_ARGS);
|
||||
|
||||
#endif
|
||||
|
||||
@ -509,3 +509,43 @@ SELECT POSITION(B'1101' IN v),
|
||||
|
||||
DROP TABLE BIT_SHIFT_TABLE;
|
||||
DROP TABLE VARBIT_SHIFT_TABLE;
|
||||
-- Get/Set bit
|
||||
SELECT get_bit(B'0101011000100', 10);
|
||||
get_bit
|
||||
---------
|
||||
1
|
||||
(1 row)
|
||||
|
||||
SELECT set_bit(B'0101011000100100', 15, 1);
|
||||
set_bit
|
||||
------------------
|
||||
0101011000100101
|
||||
(1 row)
|
||||
|
||||
SELECT set_bit(B'0101011000100100', 16, 1); -- fail
|
||||
ERROR: bit index 16 out of valid range (0..15)
|
||||
-- Overlay
|
||||
SELECT overlay(B'0101011100' placing '001' from 2 for 3);
|
||||
overlay
|
||||
------------
|
||||
0001011100
|
||||
(1 row)
|
||||
|
||||
SELECT overlay(B'0101011100' placing '101' from 6);
|
||||
overlay
|
||||
------------
|
||||
0101010100
|
||||
(1 row)
|
||||
|
||||
SELECT overlay(B'0101011100' placing '001' from 11);
|
||||
overlay
|
||||
---------------
|
||||
0101011100001
|
||||
(1 row)
|
||||
|
||||
SELECT overlay(B'0101011100' placing '001' from 20);
|
||||
overlay
|
||||
---------------
|
||||
0101011100001
|
||||
(1 row)
|
||||
|
||||
|
||||
@ -1579,3 +1579,21 @@ SELECT btrim(E'\\000trim\\000'::bytea, ''::bytea);
|
||||
\000trim\000
|
||||
(1 row)
|
||||
|
||||
SELECT encode(overlay(E'Th\\000omas'::bytea placing E'Th\\001omas'::bytea from 2),'escape');
|
||||
encode
|
||||
-------------
|
||||
TTh\x01omas
|
||||
(1 row)
|
||||
|
||||
SELECT encode(overlay(E'Th\\000omas'::bytea placing E'\\002\\003'::bytea from 8),'escape');
|
||||
encode
|
||||
--------------------
|
||||
Th\000omas\x02\x03
|
||||
(1 row)
|
||||
|
||||
SELECT encode(overlay(E'Th\\000omas'::bytea placing E'\\002\\003'::bytea from 5 for 3),'escape');
|
||||
encode
|
||||
-----------------
|
||||
Th\000o\x02\x03
|
||||
(1 row)
|
||||
|
||||
|
||||
@ -184,3 +184,14 @@ SELECT POSITION(B'1101' IN v),
|
||||
|
||||
DROP TABLE BIT_SHIFT_TABLE;
|
||||
DROP TABLE VARBIT_SHIFT_TABLE;
|
||||
|
||||
-- Get/Set bit
|
||||
SELECT get_bit(B'0101011000100', 10);
|
||||
SELECT set_bit(B'0101011000100100', 15, 1);
|
||||
SELECT set_bit(B'0101011000100100', 16, 1); -- fail
|
||||
|
||||
-- Overlay
|
||||
SELECT overlay(B'0101011100' placing '001' from 2 for 3);
|
||||
SELECT overlay(B'0101011100' placing '101' from 6);
|
||||
SELECT overlay(B'0101011100' placing '001' from 11);
|
||||
SELECT overlay(B'0101011100' placing '001' from 20);
|
||||
|
||||
@ -547,3 +547,6 @@ SELECT trim(E'\\000'::bytea from E'\\000Tom\\000'::bytea);
|
||||
SELECT btrim(E'\\000trim\\000'::bytea, E'\\000'::bytea);
|
||||
SELECT btrim(''::bytea, E'\\000'::bytea);
|
||||
SELECT btrim(E'\\000trim\\000'::bytea, ''::bytea);
|
||||
SELECT encode(overlay(E'Th\\000omas'::bytea placing E'Th\\001omas'::bytea from 2),'escape');
|
||||
SELECT encode(overlay(E'Th\\000omas'::bytea placing E'\\002\\003'::bytea from 8),'escape');
|
||||
SELECT encode(overlay(E'Th\\000omas'::bytea placing E'\\002\\003'::bytea from 5 for 3),'escape');
|
||||
|
||||
Loading…
Reference in New Issue
Block a user