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shishi_asn1_read_optional(3)	    shishi	  shishi_asn1_read_optional(3)

NAME
       shishi_asn1_read_optional - API function

SYNOPSIS
       #include	<shishi.h>

       int  shishi_asn1_read_optional(Shishi * handle, Shishi_asn1 node, const
       char * field, char ** data, size_t * datalen);

ARGUMENTS
       Shishi *	handle
		   shishi handle as allocated by shishi_init().

       Shishi_asn1 node
		   ASN.1 variable to read field	from.

       const char * field
		   name	of field in node to read.

       char ** data
		   newly allocated output buffer that will  hold  ASN.1	 field
		   data.

       size_t *	datalen
		   actual size of output buffer.

DESCRIPTION
       Extract data stored in a	ASN.1 field into a newly allocated buffer.  If
       the field does not exist	(i.e., SHISHI_ASN1_NO_ELEMENT),	this  function
       set  datalen  to	 0  and	 succeeds.  Can	be useful to read ASN.1	fields
       which are marked	OPTIONAL in the	grammar, if you	want to	avoid  special
       error handling in your code.

RETURN VALUE
       Returns	SHISHI_OK if successful, SHISHI_ASN1_NO_VALUE if the field has
       no value, ot SHISHI_ASN1_ERROR otherwise.

REPORTING BUGS
       Report bugs to <bug-shishi@gnu.org>.

COPYRIGHT
       Copyright (C) 2002-2010 Simon Josefsson.
       Copying and distribution	of this	file, with  or	without	 modification,
       are  permitted in any medium without royalty provided the copyright no-
       tice and	this notice are	preserved.

SEE ALSO
       The full	documentation for shishi is maintained as  a  Texinfo  manual.
       If  the	info  and shishi programs are properly installed at your site,
       the command

	      info shishi

       should give you access to the complete manual.

shishi				     1.0.2	  shishi_asn1_read_optional(3)

NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURN VALUE | REPORTING BUGS | COPYRIGHT | SEE ALSO

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