Michael Davidsaver
a02b6e9730
Partially replicate the '$' handling logic of dbChannelCreate() in the case where no '$' was provided.
82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
/*
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*
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* Author George S. McIntyre <george@level-n.com>, 2023
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*
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*/
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#include <string>
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#include <dbAccess.h>
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#include "channel.h"
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#include "dbentry.h"
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#include "utilpvt.h"
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#ifndef PVLINK_STRINGSZ
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# define PVLINK_STRINGSZ 1024
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#endif
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namespace pvxs {
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namespace ioc {
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/**
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* Construct a group channel from a given db channel name
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*
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* @param name the db channel name
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*/
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Channel::Channel(const char* name)
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:chan(std::shared_ptr<dbChannel>(std::shared_ptr<dbChannel>(dbChannelCreate(name),
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[](dbChannel* ch) {
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if (ch) {
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dbChannelDelete(ch);
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}
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})))
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{
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if(!*this)
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throw std::runtime_error(SB()<<"Invalid PV: "<<name);
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{
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if( dbIsValueField(dbChannelFldDes(chan))) {
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// info() hint only applies to VAL
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DBEntry ent(dbChannelRecord(chan));
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form = ent.info("Q:form", "Default");
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} else {
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form = "Default";
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}
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/* ~duplicate '$' handling logic in dbChannelCreate()
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* when no '$' is present.
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*
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* situation circa Base 7.0.7
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* At this point dbChannelCreate() has initialized chan->addr.
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* SPC_DBADDR fields have been mangled by record support code.
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* filter have been parsed, but not opened.
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*/
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auto field_type(dbChannelFieldType(chan));
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if(field_type==DBF_STRING && dbChannelElements(chan)==1
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&& dbChannelFieldSize(chan)>MAX_STRING_SIZE+1)
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{
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// scalar string field with extra capacity
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chan->addr.no_elements = chan->addr.field_size;
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chan->addr.field_size = 1;
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chan->addr.field_type = DBF_CHAR;
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chan->addr.dbr_field_type = DBR_CHAR;
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form = "String";
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} else if(field_type >= DBF_INLINK && field_type <= DBF_FWDLINK) {
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chan->addr.no_elements = PVLINK_STRINGSZ;
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chan->addr.field_size = 1;
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chan->addr.dbr_field_type = DBR_CHAR;
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form = "String";
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}
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}
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if (dbChannelOpen(chan.get()))
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throw std::invalid_argument(SB() << "Failed dbChannelOpen(\"" << dbChannelName(chan) <<"\")");
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}
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} // pvxs
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} // ioc
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