Provided by: shishi-doc_1.0.3-2.1build2_all bug

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>.  GNU Shishi home page: http://www.gnu.org/software/shishi/ General
       help using GNU software: http://www.gnu.org/gethelp/


COPYRIGHT
       Copyright © 2002-2022 Simon Josefsson.
       Copying and distribution of this file, with or without modification, are permitted in any medium  without
       royalty provided the copyright notice 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                                                1.0.3                         shishi_asn1_read_optional(3)