tgetent, tgetnum, tgetflag, tgetstr, tgoto, tputs - terminal independent operation routines
char PC; char *BC; char *UP; short ospeed; tgetent(bp, name) char *bp, *name; tgetnum(id) char *id; tgetflag(id) char *id; char * tgetstr(id, area) char *id, **area; char * tgoto(cm, destcol, destline) char *cm; tputs(cp, affcnt, outc) register char *cp; int affcnt; int (*outc)();
These functions extract and use capabilities from the terminal capability data base termcap (UCB).
Tgetent extracts the entry for terminal name into the buffer at bp. Bp should be a character buffer of size BUFSIZ (i.e. 512) and must be retained through all subsequent calls to tgetnum, tgetflag, and tgetstr. Tgetent returns -1 if it cannot open the termcap file, 0 if the terminal name given does not have an entry, and 1 if all goes well. It will look in the environment for a TERMCAP variable and use its value as a path name rather than /etc/termcap if one is found; this can be used to debug new terminal descriptions or to make one for your terminal if you can't write the file /etc/termcap.
Tgetnum gets the numeric value of capability id, returning -1 if is not given for the terminal. Tgetflag returns 1 if the specified capability is present in the terminal's entry, 0 if it is not. Tgetstr gets the string value of capability id, placing it in the buffer at area, advancing the area pointer. It decodes the abbreviations for this field described in termcap (UCB).
Tgoto returns a cursor addressing string decoded from cm to go to column destcol in line destline. It uses the external variables UP (from the up capability) and BC (if bc is given rather than bs) if necessary to avoid placing \Et, \En, ^D or ^@ in the returned string. If a % sequence is given which is not understood, then tgoto returns ``OOPS''.
Tputs decodes the leading padding information of the string cp; affcnt gives the number of lines affected by the operation, or 1 if this is not applicable, outc is a routine which is called with each character in turn. The external variable ospeed should contain the output speed of the terminal as encoded by stty (2). The external variable PC should contain a pad character to be used (from the pc capability) if a null (^@) is inappropriate.
ex (UCB), termcap (UCB)
The terminal independent cursor motion optimization routines of ex should be placed in the library also.