Terminal Description Fields

A terminal description field starts with a mnemonic followed by a command string or value. The mnemonic tells the parser what capability the command string accesses or what the value represents. Mnemonics that are supported by Vermont Views are listed in Table 58.1.

There are four types of terminal description fields: boolean, numeric, char, and string.

nThe presence of a Boolean field in vvtermcap indicates that the terminal has a particular feature. Boolean fields are specified in a vvtermcap entry by a mnemonic abbreviation only. For example, including CA in the example vvtermcap entry means that the ANSI terminal clears the screen with the current attribute instead of always using the NORMAL attribute. In Vermont Views, boolean fields are flagged as TDF_BOOL fields.
nA numeric field is specified by a mnemonic followed by a pound sign (#) and the value. For example, the field "li#25" in the example vvtermcap entry means that there are 25 lines on the ANSI terminal. In Vermont Views, numeric fields are flagged as TDF_INT fields.
nA character field is specified by a mnemonic followed by an equal sign (=) and then a character. For example, the field "G1=?" indicates that the upper-right character for a single-line border is the character '?'. In Vermont Views, character fields are flagged as TDF_CHAR fields.
nA string field is specified by the mnemonic followed by an equal sign (=) and then the string. For example, the entry "cl=\E[2J\E[H" gives the control sequence that clears the screen. In Vermont Views, string fields are flagged as TDF_STR fields.

Table 58.1: Mnemonics Supported in Vermont Views

Mnemonic	Type	Description
Aka - Akz *	TDF_STR	Generates KEY_AA, KEY_AB,... KEY_AZ keycodes
BB *	TDF_STR	Enter blink mode
bc	TDF_STR	Generates KEY_BACK keycode
BE *	TDF_STR	Bell character
BG	TDF_INT	Allow use of blink mode
BR *	TDF_STR	Exit blink mode
bt	TDF_STR	Generates KEY_STAB keycode
CA *	TDF_BOOL	Terminal clears screen with current attribute (if you do not specify and this capability is available, full-screen clears with attributes other than NORMAL or LSYS will be slow)
CB	TDF_STR	Make cursor shape a block
CF *	TDF_STR	Cursor off
Ck0 - Ck39 *	TDF_STR	Generates KEY_CF1, KEY_CF2,... KEY_CF40 keycodes
Cka - Ckz *	TDF_STR	Generates KEY_CA, KEY_CB,... KEY_CZ keycodes
cl	TDF_STR	Clear screen (will improve speed)
CL	TDF_STR	Make cursor shape a line
cm	TDF_STR	Cursor motion
co	TDF_INT	Number of columns
CO *	TDF_STR	Cursor on
ct *	TDF_BOOL	Terminal supports color (some terminals)
DL	TDF_STR	Generates KEY_DEL keycode
EN *	TDF_STR	Generates KEY_END keycode
ESC *	TDF_STR	Generates KEY_ESC keycode
G1 *	TDF_CHAR	Single line upper-right corner character
G2 *	TDF_CHAR	Single line upper-left corner character
G3 *	TDF_CHAR	Single line lower-left corner character
G4 *	TDF_CHAR	Single line lower-right corner character
G5 *	TDF_CHAR	Double line upper-right corner character
G6 *	TDF_CHAR	Double line upper-left corner character
G7 *	TDF_CHAR	Double line lower-left corner character
G8 *	TDF_CHAR	Double line lower-right corner character
GC *	TDF_CHAR	Single line intersection character `+`
Gc *	TDF_CHAR	Double line intersection character `+`
GD *	TDF_CHAR	Single line intersection character `-`
Gd *	TDF_CHAR	Double line intersection character `-`
GE *	TDF_STR	Exit block graphics mode
GG *	TDF_INT	Number of blank characters taken by GS, GE
GH *	TDF_STR	Single line horizontal bar character `D`
Gh *	TDF_CHAR	Double line horizontal bar character `M`
GL *	TDF_CHAR	Single line intersection character `¦`
Gl *	TDF_CHAR	Double line intersection character `¦`
GR *	TDF_CHAR	Single line intersection character `+`
Gr *	TDF_CHAR	Double line intersection character `¦`
GS *	TDF_STR	Enter block graphics mode
GU *	TDF_CHAR	Single line intersection character `-`
Gu *	TDF_CHAR	Double line intersection character `-`
GV *	TDF_STR	Single line vertical bar character `¦`
Gv *	TDF_CHAR	Double line vertical bar character `:`
HG	TDF_INT	Allow use of high intensity mode
HR *	TDF_STR	Exit high intensity mode
HS *	TDF_STR	Enter high intensity mode
is	TDF_STR	Terminal initialization string
k0-k39 *	TDF_STR	Generates KEY_F1, KEY_F2, ..., KEY_F40 keycodes
kd	TDF_STR	Generates KEY_DN keycode
ke	TDF_STR	Exit keypad mode
kh	TDF_STR	Generates KEY_HOME keycode
ki *	TDF_STR	Generates KEY_INS keycode
kl	TDF_STR	Generates KEY_LEFT keycode
kr	TDF_STR	Generates KEY_RIGHT keycode
ks	TDF_STR	Sets keypad mode
ku	TDF_STR	Generates KEY_UP keycode
L_xxx *	TDF_STR	Key label, where xxx is the mnemonic for a keycode
li	TDF_INT	Number of lines
pc	TDF_CHAR	Pad character
PD *	TDF_STR	Generates KEY_PGDN keycode
PL *	TDF_STR	Generates KEY_CLEFT keycode
PR *	TDF_STR	Generates KEY_CRIGHT keycode
PU *	TDF_STR	Generates KEY_PGUP keycode
rcl0 - rclx *	TDF_STR	Reset colors to NORMAL
scl0 - sclx *	TDF_STR	Set foreground and background colors
se	TDF_STR	Exit reverse video mode
sg	TDF_INT	Number of blank characters taken by se, so
Sk0 - Sk39 *	TDF_STR	Generates KEY_SF1, KEY_SF2, ..., KEY_SF40 keycodes
snow *	TDF_BOOL	Console is a CGA and will produce snow if write to video RAM. Instead go through the terminal driver (do slow output)
so	TDF_STR	Enter reverse video mode
SPD *	TDF_STR	Generates KEY_CPGDN keycode
SPU *	TDF_STR	Generates KEY_CPGUP keycode
SXD *	TDF_STR	Generates KEY_CEND keycode
SXU *	TDF_STR	Generates KEY_CHOME keycode
tc	TDF_STR	Similar terminal
ue	TDF_STR	Exit underline mode
ug	TDF_INT	Number of blank characters taken by ue, us
us	TDF_STR	Enter underline mode
xhp	TDF_BOOL	Hewlett Packard terminal
xi *	TDF_BOOL	Terminal will not automatically do a hardware scroll when the last position (last row and last column) on the screen is written to. Specify if available, otherwise Vermont Views will never write to the last position in order to avoid the automatic scrolling.
ZM *	TDF_STR	Window zoom

* Indicates mnemonics unique to vvtermcap; all other entries specified in a standard UNIX termcap file.