cdds_offset - field offset within DDS type

SYNOPSIS

#include "cdds.h"

int cdds_offset(bin_tag, field_tag);

BIN_TAG bin_tag
FIELD_TAG field_tag

DESCRIPTION

This function returns the byte offset of a field within a DDS binary.

INPUT

bin_tag is a binary tag, previously obtained from cdds_open. It specifies a particular binary stream.

field_tag is a tag that identifies a field within bin_tag.

OUTPUT

The return value is the byte offset of field_tag within bin_tag, or -1 if an error occurred.

EXAMPLE

          
            BIN_TAG bin;
            char *buf;
            short *RecNum;
            ...
            /* find RecNum field within buf (short int) */
            field = cdds_member(bin, 0, "RecNum");
            RecNum = (short*)(buf + cdds_offset(bin, field));

SEE ALSO

      cdds_index Field index with DDS type

AUTHOR

R. L. Selzler, EPTG (Oct 1995)