Function: read-coding-system

read-coding-system is a function defined in coding.c.

Signature

(read-coding-system PROMPT &optional DEFAULT-CODING-SYSTEM)

Documentation

Read a coding system from the minibuffer, prompting with string PROMPT.

If the user enters null input, return second argument DEFAULT-CODING-SYSTEM. Return the coding-system's symbol, or nil if both the user input and DEFAULT-CODING-SYSTEM are empty or null. Ignores case when completing coding systems (all Emacs coding systems are lower-case).

View in manual

Source Code

// Defined in /usr/src/emacs/src/coding.c
{
  Lisp_Object val;
  specpdl_ref count = SPECPDL_INDEX ();

  if (SYMBOLP (default_coding_system))
    default_coding_system = SYMBOL_NAME (default_coding_system);
  specbind (Qcompletion_ignore_case, Qt);
  val = Fcompleting_read (prompt, Vcoding_system_alist, Qnil,
			  Qt, Qnil, Qcoding_system_history,
			  default_coding_system, Qnil);
  val = unbind_to (count, val);
  return (SCHARS (val) == 0 ? Qnil : Fintern (val, Qnil));
}