69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
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/*
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* Copyright (c) 1993 by the University of Southern California
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*
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* For copying and distribution information, please see the file
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* <usc-license.h>.
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*
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* Written by bcn 2/93 to send reply to request
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* Hacked by swa 11/94 to send length-coded reply to request.
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*/
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#include <usc-license.h>
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#include <stdio.h>
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#include <ardp.h>
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/*
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* ardp_breply - send a reply to a request that might contain binary data
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*
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* ardp_breply reply takes request to which a reply is to be sent
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* a flags field, and a message to be sent to the client in response
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* to the request, and a length count for the message. ardp_breply then adds
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* the response to the output queue for the request.
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*
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* A length count of 0 indicates that the buffer is null-terminated.
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* (implementation note: by passing the 0 down to ardp_add2req, we
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* allow there to be only one pass through the buffer instead of 2.)
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*
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* If space remains in the packet, the response is buffered pending
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* subsequent replies, unless the ARDP_REPL_COMPLETE has been specified,
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* in which case all data is sent. If the size of the buffered response
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* approaches the maximum packet size, the buffered data is sent, and
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* and a new packet is started to hold any remaining data from the current
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* message.
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*
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* The lower level function (ardp_respond) assigns packet numbers and
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* tags outgoing packets if necessary or a multi packet response.
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*/
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int
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ardp_breply(RREQ req, /* Request to which this is a response */
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int flags, /* Whether this is the final message */
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char *message, /* The data to be sent. */
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int len) /* message length; 0 means null-terminated */
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{
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int tmp;
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tmp = ardp_add2req(req,flags,message,len);
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if (tmp) return tmp;
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if(flags&ARDP_R_COMPLETE) return(ardp_respond(req,ARDP_R_COMPLETE));
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/* Check to see if any packets are done */
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#if 1
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if(req->outpkt && req->outpkt->next) {
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#else
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/* This always yields the same results as the previous line but appears
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clunkier to me. */
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if(req->outpkt && (req->outpkt->previous != req->outpkt)) {
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#endif
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PTEXT tpkt; /* Temp to hold active packet */
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/* Hold out final packet */
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tpkt = req->outpkt->previous;
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EXTRACT_ITEM(tpkt,req->outpkt);
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tmp = ardp_respond(req,ARDP_R_INCOMPLETE);
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APPEND_ITEM(tpkt,req->outpkt);
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if (tmp) return tmp;
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}
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return(ARDP_SUCCESS);
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}
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