Experimental Physics and
Industrial Control System

mdavidsaver via Core-talk <core-talk at aps.anl.gov> · Thu, 26 Aug 2021 16:17:45 -0000

The character set restriction of PVD fields (in groups or otherwise) is
meant to mirror that of C89 keywords.

> int abc;

... is valid

> int a-bc;

... is not

This was a somewhat arbitrary decision made many years ago.  imo.
changing it is primarily a question of backwards compatibility.
Anything rejected by (or crashing) existing/older clients is a non-
starter.

Be aware that there is no separate versioning for the PVD encoding.
imo. an oversight in the design.  The negotiated PVA protocol version is
the only way to communicate handle changes.  You should also be aware
that the existing pvData (de)serialization APIs don't expose the
negotiated protocol version.  So making even seemingly small changes to
the PVD encoding format would be complicated.

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https://bugs.launchpad.net/bugs/1935037

Title:
  Invalid charactor in field name

Status in EPICS Base:
  New

Bug description:
  When creating a group in QSRV, the allowed characters are too
  restrictive

  error:
  Error Group not created: Invalid charactor '-' (45) in field name "BI02-TimeRise" must be A-Z, a-z, 0-9, or '_'

  expected behaviour:
  pva structures should allow for a more liberal set of characters that just what is covered by \w regex metacharacter.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System