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Don't need to explain [1] kluge anymore in xfunc.sgml.

This commit is contained in:
Tom Lane 2015-02-21 16:29:45 -05:00
parent 2e211211a7
commit 0627eff360
1 changed files with 3 additions and 8 deletions
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11
doc/src/sgml/xfunc.sgml
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@ -1885,17 +1885,12 @@ typedef struct
<programlisting> <programlisting>
typedef struct { typedef struct {
int32 length; int32 length;
char data[1]; char data[FLEXIBLE_ARRAY_MEMBER];
} text; } text;
</programlisting> </programlisting>
Obviously, the data field declared here is not long enough to hold The <literal>[FLEXIBLE_ARRAY_MEMBER]</> notation means that the actual
all possible strings. Since it's impossible to declare a variable-size length of the data part is not specified by this declaration.
structure in <acronym>C</acronym>, we rely on the knowledge that the
<acronym>C</acronym> compiler won't range-check array subscripts. We
just allocate the necessary amount of space and then access the array as
if it were declared the right length. (This is a common trick, which
you can read about in many textbooks about C.)
</para> </para>
<para> <para>