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(readline.info)Utility Functions

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Utility Functions
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 - Function: int rl_extend_line_buffer (int len)
     Ensure that `rl_line_buffer' has enough space to hold LEN
     characters, possibly reallocating it if necessary.

 - Function: int rl_initialize (void)
     Initialize or re-initialize Readline's internal state.  It's not
     strictly necessary to call this; `readline()' calls it before
     reading any input.

 - Function: int rl_ding (void)
     Ring the terminal bell, obeying the setting of `bell-style'.

 - Function: int rl_alphabetic (int c)
     Return 1 if C is an alphabetic character.

 - Function: void rl_display_match_list (char **matches, int len, int
          max)
     A convenience function for displaying a list of strings in
     columnar format on Readline's output stream.  `matches' is the list
     of strings, in argv format, such as a list of completion matches.
     `len' is the number of strings in `matches', and `max' is the
     length of the longest string in `matches'.  This function uses the
     setting of `print-completions-horizontally' to select how the
     matches are displayed (Note: Readline Init File Syntax).

   The following are implemented as macros, defined in `chardefs.h'.
Applications should refrain from using them.

 - Function: int _rl_uppercase_p (int c)
     Return 1 if C is an uppercase alphabetic character.

 - Function: int _rl_lowercase_p (int c)
     Return 1 if C is a lowercase alphabetic character.

 - Function: int _rl_digit_p (int c)
     Return 1 if C is a numeric character.

 - Function: int _rl_to_upper (int c)
     If C is a lowercase alphabetic character, return the corresponding
     uppercase character.

 - Function: int _rl_to_lower (int c)
     If C is an uppercase alphabetic character, return the corresponding
     lowercase character.

 - Function: int _rl_digit_value (int c)
     If C is a number, return the value it represents.