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RedHat 9 (Linux i386) - man page for tgetent (redhat section 3X)

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curs_termcap(3X)								 curs_termcap(3X)

       tgetent,  tgetflag,  tgetnum,  tgetstr, tgoto, tputs - direct curses interface to the ter-
       minfo capability database

       #include <curses.h>
       #include <term.h>
       extern char PC; extern char * UP; extern char * BC; extern unsigned int ospeed;
       int tgetent(char *bp, const char *name);
       int tgetflag(char *id);
       int tgetnum(char *id);
       char *tgetstr(char *id, char **area);
       char *tgoto(const char *cap, int col, int row);
       int tputs(const char *str, int affcnt, int (*putc)(int));

       These routines are included as a conversion aid for programs that use the termcap library.
       Their  parameters  are the same and the routines are emulated using the terminfo database.
       Thus, they can only be used to query the capabilities of  entries  for  which  a  terminfo
       entry has been compiled.

       The  tgetent  routine loads the entry for name.	It returns 1 on success, 0 if there is no
       such entry, and -1 if the terminfo database could not be found.	The emulation ignores the
       buffer pointer bp.

       The tgetflag routine gets the boolean entry for id, or zero if it is not available.

       The tgetnum routine gets the numeric entry for id, or -1 if it is not available.

       The  tgetstr routine returns the string entry for id, or zero if it is not available.  Use
       tputs to output the returned string.  The return value will also be copied to  the  buffer
       pointed	to by area, and the area value will be updated to point past the null ending this

       Only the first two characters of the id parameter of tgetflag,  tgetnum	and  tgetstr  are
       compared in lookups.

       The  tgoto routine instantiates the parameters into the given capability.  The output from
       this routine is to be passed to tputs.

       The tputs routine is described on the curs_terminfo(3X)	manual	page.	It  can  retrieve
       capabilities by either termcap or terminfo name.

       The  variables PC, UP and BC are set by tgetent to the terminfo entry's data for pad_char,
       cursor_up and backspace_if_not_bs, respectively.  UP is not used by ncurses.  PC  is  used
       in the tdelay_output function.  BC is used in the tgoto emulation.  The variable ospeed is
       set by ncurses in a system-specific coding to reflect the terminal speed.

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

       Routines that return pointers return NULL on error.

       If  you	call tgetstr to fetch ca or any other parameterized string, be aware that it will
       be returned in terminfo notation, not the older and not-quite-compatible termcap notation.
       This  won't cause problems if all you do with it is call tgoto or tparm, which both expand
       terminfo-style strings as terminfo.  (The tgoto function, if configured to  support  term-
       cap,  will  check if the string is indeed terminfo-style by looking for "%p" parameters or
       "$<..>" delays, and invoke a termcap-style parser if the string does not appear to be ter-

       Because	terminfo  conventions for representing padding in string capabilities differ from
       termcap's, tputs("50"); will put out a literal "50" rather than busy-waiting for  50  mil-
       liseconds.  Cope with it.

       The  XSI  Curses standard, Issue 4 describes these functions.  However, they are marked TO
       BE WITHDRAWN and may be removed in future versions.

       Neither the XSI Curses standard nor the SVr4 man pages documented  the  return  values  of
       tgetent correctly, though all three were in fact returned ever since SVr1.  In particular,
       an omission in the XSI Curses documentation has been misinterpreted to mean  that  tgetent
       returns	OK  or	ERR.   Because the purpose of these functions is to provide compatibility
       with the termcap library, that is a defect in XCurses, Issue 4, Version 2 rather  than  in

       External  variables  are  provided  for support of certain termcap applications.  However,
       termcap applications' use of those variables is poorly documented, e.g., not  distinguish-
       ing  between  input  and output.  In particular, some applications are reported to declare
       and/or modify ospeed.

       curses(3X), terminfo(5), putc(3S).

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