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curs_util(3X)                                                    curs_util(3X)

       delay_output, filter(1,3x,3x curs_util), flushinp, getwin, key_name, keyname, putwin, unc-
       trl, use_env, wunctrl - miscellaneous curses utility routines

       #include <curses.h>

       char *unctrl(chtype c);
       char *wunctrl(cchar_t *c);
       char *keyname(int c);
       char *key_name(wchar_t w);
       void filter(1,3x,3x curs_util)(void);
       void use_env(bool f);
       int putwin(WINDOW *win, FILE *filep);
       WINDOW *getwin(FILE *filep);
       int delay_output(int ms);
       int flushinp(void);

       The unctrl routine returns a character string(3,n) which is a printable rep-
       resentation  of  the character c, ignoring attributes.  Control charac-
       ters are displayed in(1,8) the ^X notation.  Printing  characters  are  dis-
       played  as is.  The corresponding wunctrl returns a printable represen-
       tation of a wide-character.

       The keyname routine returns a character string(3,n) corresponding to the key
       c.   Control characters are displayed in(1,8) the ^X notation.  Values above
       128 are either meta characters, shown in(1,8) the M-X notation, or the names
       of  function keys, or null.  The corresponding key_name returns a char-
       acter string(3,n) corresponding to the  wide-character  value  w.   The  two
       functions  do  not  return  the same set(7,n,1 builtins) of strings; the latter returns
       null where the former would display a meta character.

       The filter(1,3x,3x curs_util) routine, if(3,n) used, must be called before initscr  or  newterm
       are called.  The effect is that, during those calls, LINES is set(7,n,1 builtins) to 1;
       the capabilities clear(1,3x,3x clrtobot), cup, cud, cud1, cuu1, cuu,  vpa  are  disabled;
       and the home string(3,n) is set(7,n,1 builtins) to the value of cr.

       The  use_env  routine, if(3,n) used, is called before initscr or newterm are
       called.  When called with FALSE as an argument, the values of lines and
       columns  specified in(1,8) the terminfo database will be used, even if(3,n) envi-
       ronment variables LINES and COLUMNS (used by default) are  set(7,n,1 builtins),  or  if(3,n)
       curses  is running in(1,8) a window (in(1,8) which case default behavior would be
       to use the window size if(3,n) LINES and COLUMNS are not set(7,n,1 builtins)).

       The putwin routine writes all data associated with window win into  the
       file(1,n)  to  which  filep points.  This information can be later retrieved
       using the getwin function.

       The getwin routine reads window related data  stored  in(1,8)  the  file(1,n)  by
       putwin.   The  routine  then creates and initializes a new window using
       that data.  It returns a pointer to the new window.

       The delay_output routine inserts an ms  millisecond  pause  in(1,8)  output.
       This  routine should not be used extensively because padding characters
       are used rather than a CPU pause.  If no padding  character  is  speci-
       fied, this uses napms to perform the delay.

       The  flushinp  routine throws away any typeahead that has been typed by
       the user and has not yet been read(2,n,1 builtins) by the program.

       Except for flushinp, routines that return an integer  return  ERR  upon
       failure  and OK (SVr4 specifies only "an integer value other than ERR")
       upon successful completion.

       flushinp always returns OK.

       Routines that return pointers return NULL on error.

       The XSI Curses standard, Issue 4 describes these functions.  It  states
       that unctrl and wunctrl will return a null pointer if(3,n) unsuccessful, but
       does not define any error(8,n) conditions.

       The SVr4 documentation describes the  action  of  filter(1,3x,3x curs_util)  only  in(1,8)  the
       vaguest  terms.   The  description  here is adapted from the XSI Curses
       standard (which erroneously fails to describe the disabling of cuu).

       The strings returned by unctrl in(1,8) this implementation are determined at
       compile  time(1,2,n),  showing C1 controls from the upper-128 codes with a `~'
       prefix rather than `^'.  Other implementations typically show both sets
       of  control characters with `^', and may strip the parameter to 7 bits.
       This implementation uses 8 bits but  does  not  modify  the  string(3,n)  to
       reflect locale.

       curses(3X), curs_initscr(3X), curs_kernel(3X), curs_scr_dump(3X).


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