radclient handling digest-attributes

[Diana Robert]

  hi all
 can anybody tell wat this code is trying to do. its in file radclient.c. i even read the /doc/rfc/draft-sterman-aaa-sip-00.txt 
                         case PW_DIGEST_REALM:
                         case PW_DIGEST_NONCE:
                         case PW_DIGEST_METHOD:
                         case PW_DIGEST_URI:
                         case PW_DIGEST_QOP:
                         case PW_DIGEST_ALGORITHM:
                         case PW_DIGEST_BODY_DIGEST:
                         case PW_DIGEST_CNONCE:
                         case PW_DIGEST_NONCE_COUNT:
                         case PW_DIGEST_USER_NAME:
                                 /* overlapping! */
                                 memmove(&vp->strvalue[2], &vp->strvalue[0], vp->length);
                                 vp->strvalue[0] = vp->attribute - PW_DIGEST_REALM + 1;
                                 vp->length += 2;
                                 vp->strvalue[1] = vp->length;
                                 vp->attribute = PW_DIGEST_ATTRIBUTES;
                                 break;
       
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