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The cstring datatype can now be copied, passed around, etc. The typlen

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value '-2' is used to indicate a variable-width type whose width is
computed as strlen(datum)+1.  Everything that looks at typlen is updated
except for array support, which Joe Conway is working on; at the moment
it wouldn't work to try to create an array of cstring.
This commit is contained in:
Tom Lane
2002-08-24 15:00:47 +00:00
parent cf4d885c67
commit 976246cc7e
23 changed files with 260 additions and 198 deletions
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12
doc/src/sgml/catalogs.sgml
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@ -1,6 +1,6 @@
<!--
Documentation of the system catalogs, directed toward PostgreSQL developers
$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.53 2002/08/13 17:22:08 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/catalogs.sgml,v 2.54 2002/08/24 15:00:45 tgl Exp $
-->
<chapter id="catalogs">
@ -3173,7 +3173,13 @@
<entry>typlen</entry>
<entry><type>int2</type></entry>
<entry></entry>
<entry>Length of the storage representation of the type, -1 if variable length</entry>
<entry>
For a fixed-size type, <structfield>typlen</structfield> is the number
of bytes in the internal representation of the type. But for a
variable-length type, <structfield>typlen</structfield> is negative.
-1 indicates a <quote>varlena</> type (one that has a length word),
-2 indicates a null-terminated C string.
</entry>
</row>
<row>
@ -3325,7 +3331,7 @@
<entry><type>char</type></entry>
<entry></entry>
<entry><para>
<structfield>typstorage</structfield> tells for variable-length
<structfield>typstorage</structfield> tells for varlena
types (those with <structfield>typlen</structfield> = -1) if
the type is prepared for toasting and what the default strategy
for attributes of this type should be.