The \e escape sequence

[Michael Elizabeth Chastain]

Welcome back, Andrew!

> What's ISO C 90 got to say about it (I gather it isn't part of that 
> version of ISO C).

I don't know what the standard says, but here is what gcc thinks that
the standard says:

  [mec.gnu@berman tmp]$ cat slash-e.c
  char c = '\e';
  [mec.gnu@berman tmp]$ gcc -std=iso9899:1990 -pedantic -c slash-e.c
  slash-e.c:1:10: warning: non-ISO-standard escape sequence, '\e'
  [mec.gnu@berman tmp]$ gcc -std=iso9899:199409 -pedantic -c slash-e.c
  slash-e.c:1:10: warning: non-ISO-standard escape sequence, '\e'
  [mec.gnu@berman tmp]$ gcc -std=iso9899:1999 -pedantic -c slash-e.c
  slash-e.c:1:10: warning: non-ISO-standard escape sequence, '\e'

It's also documented in "info gcc" as an extension to ISO C.

> If it isn't then it shouldn't be used or tested 
> (except barely maybe in a GCC specific test).

Sounds good to me.

Michael C