[RFC PATCH v7] Input/Output Terminal Abstraction

This expands on Marcel Holtman's 2023-12-22 RFCv4 patch for an
input/output terminal abstraction.

Substantive changes from the v6 version:

  * Added ASCII C0 and C1 control code mnemonics.
    
    Added ASCII C0 and C1 control code mnemonics useful to anyone
    implementing a l_term key handler.

  * Reflected mailing list feedback from Phil Hodges <[email protected]>.

Grant Erickson (9):
  term: Initial revision.
  ell: Add include directive for 'ell/term.h'.
  ell/Makefile: Added 'term.[ch]' to HEADERS and SOURCES.
  term: Added 'l_term_*' symbols.
  ell/term: Do not return -EPERM for 'putnstr' and 'vprint' if not
    running.
  ell/term: Return error on writes if the output descriptor is invalid.
  ell/edit: Rename 'l_term_{open,close}'.
  ell/term: Add an 'l_term_is_acquired' introspection function.
  ell/term: Added ASCII C0 and C1 control code mnemonics.

 Makefile.am |   2 +
 ell/ell.h   |   1 +
 ell/ell.sym |  22 +++
 ell/term.c  | 501 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 ell/term.h  | 215 ++++++++++++++++++++++
 5 files changed, 741 insertions(+)
 create mode 100644 ell/term.c
 create mode 100644 ell/term.h

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2.42.0