Re: lsi record for more than 40 characters doesn't work

[Eric Norum via Tech-talk <tech-talk@aps.anl.gov>]

Others have dealt with the original question, but I’d like to add a followup.

Conversion strings like the one shown in the original message are unsafe and should never be used.  They can lead to buffer overflows and weird IOC behaviour.

The capacity of the destination buffer should always be specified.  Here, from the ASYN streamSCPI template, are the ’short’ and ‘long’ string versions of records to read SCPI identification strings:

record(stringin, "$(P)$(R)IDN")

{

    field(DESC, "SCPI identification string")

    field(DTYP, "stream")

    field(INP,  "@dev_NAME_.proto getIDN(39) $(PORT) $(A)")

    field(PINI, "YES")

}

record(waveform, "$(P)$(R)IDNwf")

{

    field(DESC, "SCPI identification string")

    field(DTYP, "stream")

    field(INP,  "@dev_NAME_.proto getIDN(199) $(PORT) $(A)")

    field(PINI, "YES")

    field(FTVL, "CHAR")

    field(NELM, "200")

}

getIDN {

    out "*IDN?";

    in "%\$1[^\r\n]";

    ExtraInput = Ignore;

}

On Nov 29, 2019, at 12:11 PM, dmnr infn via Tech-talk <tech-talk@aps.anl.gov> wrote:

Hi all,

I have a .db e .proto made in this way:

.db

record(lsi, "RF:getString")
{
    field(DESC, "String more than 40 chars")
    field(SIZV, "80")
    field(INP, "@MDO.proto getString L0")

    field(SCAN, ".2 second")
}

.proto
getString {
    out "STT?";
    in "%s";
}

I want to get a String that is more than 40 characters, and I use a lsi record but I got always 40 chars.

There is something wrong in my code?

Thank you

-- 
Eric Norum
wenorum@lbl.gov
“Ah, the chance to be pedantic first thing on a Monday morning — what a great way to start the week."