[Bug 1943245] [NEW] epicsStrnEscapedFromRaw may print inclomplete escape sequences

[Dirk Zimoch via Core-talk <core-talk at aps.anl.gov>]

Public bug reported:

When epicsStrnEscapedFromRaw runs out of buffer space in the middle of an escape sequence, it prints incomplete and thus invalid sequences.
For example printing "\xff" (1 byte 0xff) into a buffer that is too short may result in `\`, `\x`, or `\xf`. In particular a stray `\` at the end may be misinterpreted for example when the escaped string itself is printed in quotes and then the outer ending quote gets "escaped".

Instead of printing incomplete sequences it should rather not print the
sequence at all.

** Affects: epics-base
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1943245

Title:
  epicsStrnEscapedFromRaw may print inclomplete escape sequences

Status in EPICS Base:
  New

Bug description:
  When epicsStrnEscapedFromRaw runs out of buffer space in the middle of an escape sequence, it prints incomplete and thus invalid sequences.
  For example printing "\xff" (1 byte 0xff) into a buffer that is too short may result in `\`, `\x`, or `\xf`. In particular a stray `\` at the end may be misinterpreted for example when the escaped string itself is printed in quotes and then the outer ending quote gets "escaped".

  Instead of printing incomplete sequences it should rather not print
  the sequence at all.

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