[Octave-bug-tracker] [bug #39774] Support octal and hexadecimal sprintf escape sequences

[Rik]

Follow-up Comment #2, bug #39774 (project octave):

We already do this for single-quoted strings in regular expressions.  Take a
look at regexp.cc


  std::string pattern = args(1).string_value ();
  if (error_state)
    return retval;
  // Matlab compatibility.
  if (args(1).is_sq_string ())
    pattern = do_regexp_ptn_string_escapes (pattern);


The function do_regexp_ptn_string_escapes is special because the escape
sequences are not qute the same as the ordinary *printf family.  However, we
already have do_string_escapes in util.cc which does escape sequence
processing.  You could code the same thing in file-io.cc for printf and check
is_sq_string() before calling do_string_escapes.

do_string_escapes() would need to be modified to support hexadecimal and octal
though.  Right now it just does the basics like "\n" -> NEWLINE.

Incidentally, I hate Matlab's single option for a character string delimiter. 
It makes everything totally confusing in Octave because we *do* have
non-interpreted single-quoted strings, except where they interact with a
Matlab function in which case they are treated as double-quoted strings.


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