.\" gd_parser_callback.3.  The gd_parser_callback man page.
.\"
.\" Copyright (C) 2008, 2009, 2010 D. V. Wiebe
.\"
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.\"
.\" This file is part of the GetData project.
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.\" any later version published by the Free Software Foundation; with no
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.TH gd_parser_callback 3 "17 September 2010" "Version 0.7.0" "GETDATA"
.SH NAME
gd_parser_callback \(em set the syntax error callback handler for a dirfile
.SH SYNOPSIS
.B #include <getdata.h>
.HP
.nh
.ad l
.BI "void gd_parser_callback(DIRFILE *" dirfile ", gd_parser_callback_t"
.IB sehandler ", void *" extra );
.hy
.ad n
.SH DESCRIPTION
The
.BR gd_parser_callback ()
function updates the syntax error callback function of the DIRFILE object
.I dirfile
to be
.IR sehandler ,
and the caller supplied extra pointer passed to the handler to be
.IR extra ,
discarding any syntax error handler and extra pointer which were previously
registered for this DIRFILE.  If
.I sehandler
is NULL, the existing handler will be removed and the default behaviour (abort
on error) restored.  See
.BR gd_cbopen (3)
for a discussion on the requirements for the syntax handler.

Since parsing of an existing format specification occurs when the DIRFILE object
is created, before this function can be called, this function is only useful to
set or modify a callback function or its caller data before calling
.BR gd_include (3),
which will invoke the callback function if syntax errors are found in the
included fragment.

This function always succeeds, and has no return value.

.SH SEE ALSO
.BR gd_cbopen (3),
.BR gd_include (3),
.BR dirfile (5)