Provided by: ncurses-bin_6.5-2_amd64 bug

NAME

       terminfo - terminal capability database

SYNOPSIS

       /etc/terminfo/*/*

DESCRIPTION

       Terminfo  is  a  database describing terminals, used by screen-oriented programs such as nvi(1), lynx(1),
       mutt(1), and other curses applications, using high-level calls to libraries  such  as  ncurses(3NCURSES).
       It  is  also  used  via  low-level calls by non-curses applications which may be screen-oriented (such as
       clear(1)) or non-screen (such as tabs(1)).

       Terminfo describes terminals by giving a set of capabilities  which  they  have,  by  specifying  how  to
       perform screen operations, and by specifying padding requirements and initialization sequences.

       This document describes ncurses version 6.5 (patch 20240427).

   terminfo Entry Syntax
       Entries in terminfo consist of a sequence of fields:

       •   Each  field  ends  with  a  comma  “,” (embedded commas may be escaped with a backslash or written as
           “\054”).

       •   White space between fields is ignored.

       •   The first field in a terminfo entry begins in the first column.

       •   Newlines and leading whitespace (spaces or tabs) may be used for formatting entries for  readability.
           These are removed from parsed entries.

           The  infocmp -f and -W options rely on this to format if-then-else expressions, or to enforce maximum
           line-width.  The resulting formatted terminal description can be read by tic.

       •   The first field for each terminal gives the names which are known for the terminal, separated by  “|”
           characters.

           The  first  name  given is the most common abbreviation for the terminal (its primary name), the last
           name given should be a long name fully identifying the terminal  (see  longname(3NCURSES)),  and  all
           others are treated as synonyms (aliases) for the primary terminal name.

           X/Open  Curses advises that all names but the last should be in lower case and contain no blanks; the
           last name may well contain upper case and blanks for readability.

           This implementation is not so strict; it allows mixed case in the primary name and aliases.   If  the
           last  name  has  no  embedded blanks, it allows that to be both an alias and a verbose name (but will
           warn about this ambiguity).

       •   Lines beginning with a “#” in the first column are treated as comments.

           While comment lines are valid at any point, the output of captoinfo and infotocap (aliases  for  tic)
           will move comments so they occur only between entries.

       Terminal  names  (except  for  the last, verbose entry) should be chosen using the following conventions.
       The particular piece of hardware making up the terminal should have a root  name,  thus  “hp2621”.   This
       name  should  not  contain  hyphens.   Modes  that the hardware can be in, or user preferences, should be
       indicated by appending a hyphen and a mode suffix.  Thus, a vt100 in 132-column mode  would  be  vt100-w.
       The following suffixes should be used where possible:

       Suffix   Example     Meaning
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       -nn      aaa-60      Number of lines on the screen

       -np      c100-4p     Number of pages of memory
       -am      vt100-am    With automargins (usually the default)
       -m       ansi-m      Mono mode; suppress color
       -mc      wy30-mc     Magic cookie; spaces when highlighting
       -na      c100-na     No arrow keys (leave them in local)
       -nam     vt100-nam   Without automatic margins
       -nl      hp2621-nl   No status line
       -ns      hp2626-ns   No status line
       -rv      c100-rv     Reverse video
       -s       vt100-s     Enable status line
       -vb      wy370-vb    Use visible bell instead of beep
       -w       vt100-w     Wide mode (> 80 columns, usually 132)

       For more on terminal naming conventions, see the term(7) manual page.

   terminfo Capabilities Syntax
       The terminfo entry consists of several capabilities, i.e., features that the terminal has, or methods for
       exercising the terminal's features.

       After the first field (giving the name(s) of the terminal entry), there should be one or more  capability
       fields.  These are Boolean, numeric or string names with corresponding values:

       •   Boolean  capabilities  are  true  when  present,  false  when absent.  There is no explicit value for
           Boolean capabilities.

       •   Numeric capabilities have a “#” following the name, then an unsigned decimal integer value.

       •   String capabilities have a “=” following the name,  then  an  string  of  characters  making  up  the
           capability value.

           String  capabilities can be split into multiple lines, just as the fields comprising a terminal entry
           can be split into multiple lines.  While blanks between fields are ignored, blanks embedded within  a
           string value are retained, except for leading blanks on a line.

       Any  capability can be canceled, i.e., suppressed from the terminal entry, by following its name with “@”
       rather than a capability value.

   Similar Terminals
       If there are two very similar terminals, one (the variant) can be defined as being just  like  the  other
       (the  base)  with certain exceptions.  In the definition of the variant, the string capability use can be
       given with the name of the base terminal:

       •   The capabilities given before use override those in the base type named by use.

       •   If there are multiple use capabilities, they are merged in reverse order.  That is, the rightmost use
           reference is processed first, then the one to its left, and so forth.

       •   Capabilities given explicitly in the entry override those brought in by use references.

       A capability can be canceled by placing xx@ to the left of the use reference that imports it, where xx is
       the capability.  For example, the entry

              2621-nl, smkx@, rmkx@, use=2621,

       defines a 2621-nl that does not have the smkx or rmkx capabilities,  and  hence  does  not  turn  on  the
       function  key  labels  when  in  visual  mode.  This is useful for different modes for a terminal, or for
       different user preferences.

       An entry included via use can contain canceled capabilities, which have  the  same  effect  as  if  those
       cancels were inline in the using terminal entry.

   Predefined Capabilities
       Tables  of capabilities ncurses recognizes in a terminfo terminal type description and available to term‐
       info-using code follow.

       •   The capability name identifies the symbol by which the programmer using the terminfo API accesses the
           capability.

       •   The  TI  (terminfo)  code  is  the  short name used by a person composing or updating a terminal type
           entry.

           Whenever possible, these codes are the same as or similar to those of the  ANSI  X3.64-1979  standard
           (now superseded by ECMA-48, which uses identical or very similar names).  Semantics are also intended
           to match those of the specification.

           terminfo codes have no hard length limit, but ncurses maintains an informal one of  5  characters  to
           keep  them  short  and  to  allow the tabs in the source file Caps to line up nicely.  (Some standard
           codes exceed this limit regardless.)

       •   The TC (termcap) code is that used by the corresponding API of ncurses.  (Some capabilities are  new,
           and have names that BSD termcap did not originate.)

       •   The description field attempts to convey the capability's semantics.

       The description field employs a handful of notations.

       (P)    indicates that padding may be specified.

       (P*)   indicates that padding may vary in proportion to the number of output lines affected.

       #i     indicates  the  ith  parameter  of  a  string capability; the programmer should pass the string to
              tparm(3NCURSES) with the parameters listed.

              If the description lists  no  parameters,  passing  the  string  to  tparm(3NCURSES)  may  produce
              unexpected behavior, for instance if the string contains percent signs.

                                      Code
       Boolean Capability Name    TI        TC  Description
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       auto_left_margin           bw        bw  cub1 wraps from column 0 to last column
       auto_right_margin          am        am  terminal has automatic margins
       no_esc_ctlc                xsb       xb  beehive (f1=escape, f2=ctrl C)
       ceol_standout_glitch       xhp       xs  standout not erased by overwriting (hp)
       eat_newline_glitch         xenl      xn  newline ignored after 80 cols (concept)
       erase_overstrike           eo        eo  can erase overstrikes with a blank
       generic_type               gn        gn  generic line type
       hard_copy                  hc        hc  hardcopy terminal
       has_meta_key               km        km  Has a meta key (i.e., sets 8th-bit)
       has_status_line            hs        hs  has extra status line
       insert_null_glitch         in        in  insert mode distinguishes nulls
       memory_above               da        da  display may be retained above the screen
       memory_below               db        db  display may be retained below the screen
       move_insert_mode           mir       mi  safe to move while in insert mode
       move_standout_mode         msgr      ms  safe to move while in standout mode
       over_strike                os        os  terminal can overstrike
       status_line_esc_ok         eslok     es  escape can be used on the status line
       dest_tabs_magic_smso       xt        xt  tabs destructive, magic so char (t1061)
       tilde_glitch               hz        hz  cannot print ~'s (Hazeltine)
       transparent_underline      ul        ul  underline character overstrikes
       xon_xoff                   xon       xo  terminal uses xon/xoff handshaking
       needs_xon_xoff             nxon      nx  padding will not work, xon/xoff required
       prtr_silent                mc5i      5i  printer will not echo on screen
       hard_cursor                chts      HC  cursor is hard to see
       non_rev_rmcup              nrrmc     NR  smcup does not reverse rmcup
       no_pad_char                npc       NP  pad character does not exist
       non_dest_scroll_region     ndscr     ND  scrolling region is non-destructive
       can_change                 ccc       cc  terminal can re-define existing colors
       back_color_erase           bce       ut  screen erased with background color
       hue_lightness_saturation   hls       hl  terminal uses only HLS color notation (Tektronix)
       col_addr_glitch            xhpa      YA  only positive motion for hpa/mhpa caps
       cr_cancels_micro_mode      crxm      YB  using cr turns off micro mode
       has_print_wheel            daisy     YC  printer needs operator to change character set
       row_addr_glitch            xvpa      YD  only positive motion for vpa/mvpa caps

       semi_auto_right_margin     sam       YE  printing in last column causes cr
       cpi_changes_res            cpix      YF  changing character pitch changes resolution
       lpi_changes_res            lpix      YG  changing line pitch changes resolution

                                      Code
       Numeric Capability Name    TI        TC  Description
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       columns                    cols      co  number of columns in a line
       init_tabs                  it        it  tabs initially every # spaces
       lines                      lines     li  number of lines on screen or page
       lines_of_memory            lm        lm  lines of memory if > line. 0 means varies
       magic_cookie_glitch        xmc       sg  number of blank characters left by smso or rmso
       padding_baud_rate          pb        pb  lowest baud rate where padding needed
       virtual_terminal           vt        vt  virtual terminal number (CB/unix)
       width_status_line          wsl       ws  number of columns in status line
       num_labels                 nlab      Nl  number of labels on screen
       label_height               lh        lh  rows in each label
       label_width                lw        lw  columns in each label
       max_attributes             ma        ma  maximum combined attributes terminal can handle
       maximum_windows            wnum      MW  maximum number of definable windows
       max_colors                 colors    Co  maximum number of colors on screen
       max_pairs                  pairs     pa  maximum number of color-pairs on the screen
       no_color_video             ncv       NC  video attributes that cannot be used with colors

       The  following  numeric capabilities are present in the SVr4.0 term structure, but are not yet documented
       in the man page.  They came in with SVr4's printer support.

                                      Code
       Numeric Capability Name    TI        TC  Description
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       buffer_capacity            bufsz     Ya  numbers of bytes buffered before printing
       dot_vert_spacing           spinv     Yb  spacing of pins vertically in pins per inch
       dot_horz_spacing           spinh     Yc  spacing of dots horizontally in dots per inch
       max_micro_address          maddr     Yd  maximum value in micro_..._address
       max_micro_jump             mjump     Ye  maximum value in parm_..._micro
       micro_col_size             mcs       Yf  character step size when in micro mode
       micro_line_size            mls       Yg  line step size when in micro mode
       number_of_pins             npins     Yh  numbers of pins in print-head
       output_res_char            orc       Yi  horizontal resolution in units per line
       output_res_line            orl       Yj  vertical resolution in units per line
       output_res_horz_inch       orhi      Yk  horizontal resolution in units per inch
       output_res_vert_inch       orvi      Yl  vertical resolution in units per inch
       print_rate                 cps       Ym  print rate in characters per second
       wide_char_size             widcs     Yn  character step size when in double wide mode
       buttons                    btns      BT  number of buttons on mouse
       bit_image_entwining        bitwin    Yo  number of passes for each bit-image row
       bit_image_type             bitype    Yp  type of bit-image device

                                      Code
       String Capability Name     TI        TC  Description
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       back_tab                   cbt       bt  back tab (P)
       bell                       bel       bl  audible signal (bell) (P)
       carriage_return            cr        cr  carriage return (P*) (P*)
       change_scroll_region       csr       cs  change region to line #1 to line #2 (P)
       clear_all_tabs             tbc       ct  clear all tab stops (P)
       clear_screen               clear     cl  clear screen and home cursor (P*)
       clr_eol                    el        ce  clear to end of line (P)
       clr_eos                    ed        cd  clear to end of screen (P*)
       column_address             hpa       ch  horizontal position #1, absolute (P)
       command_character          cmdch     CC  terminal settable cmd character in prototype !?
       cursor_address             cup       cm  move to row #1 columns #2
       cursor_down                cud1      do  down one line
       cursor_home                home      ho  home cursor (if no cup)
       cursor_invisible           civis     vi  make cursor invisible
       cursor_left                cub1      le  move left one space

       cursor_mem_address         mrcup     CM  memory relative cursor addressing, move to row #1 columns #2
       cursor_normal              cnorm     ve  make cursor appear normal (undo civis/cvvis)
       cursor_right               cuf1      nd  non-destructive space (move right one space)
       cursor_to_ll               ll        ll  last line, first column (if no cup)
       cursor_up                  cuu1      up  up one line
       cursor_visible             cvvis     vs  make cursor very visible
       delete_character           dch1      dc  delete character (P*)
       delete_line                dl1       dl  delete line (P*)
       dis_status_line            dsl       ds  disable status line
       down_half_line             hd        hd  half a line down
       enter_alt_charset_mode     smacs     as  start alternate character set (P)
       enter_blink_mode           blink     mb  turn on blinking
       enter_bold_mode            bold      md  turn on bold (extra bright) mode
       enter_ca_mode              smcup     ti  string to start programs using cup
       enter_delete_mode          smdc      dm  enter delete mode
       enter_dim_mode             dim       mh  turn on half-bright mode
       enter_insert_mode          smir      im  enter insert mode
       enter_secure_mode          invis     mk  turn on blank mode (characters invisible)
       enter_protected_mode       prot      mp  turn on protected mode
       enter_reverse_mode         rev       mr  turn on reverse video mode
       enter_standout_mode        smso      so  begin standout mode
       enter_underline_mode       smul      us  begin underline mode
       erase_chars                ech       ec  erase #1 characters (P)
       exit_alt_charset_mode      rmacs     ae  end alternate character set (P)
       exit_attribute_mode        sgr0      me  turn off all attributes
       exit_ca_mode               rmcup     te  strings to end programs using cup
       exit_delete_mode           rmdc      ed  end delete mode
       exit_insert_mode           rmir      ei  exit insert mode
       exit_standout_mode         rmso      se  exit standout mode
       exit_underline_mode        rmul      ue  exit underline mode
       flash_screen               flash     vb  visible bell (may not move cursor)
       form_feed                  ff        ff  hardcopy terminal page eject (P*)
       from_status_line           fsl       fs  return from status line
       init_1string               is1       i1  initialization string
       init_2string               is2       is  initialization string
       init_3string               is3       i3  initialization string
       init_file                  if        if  name of initialization file
       insert_character           ich1      ic  insert character (P)
       insert_line                il1       al  insert line (P*)
       insert_padding             ip        ip  insert padding after inserted character
       key_backspace              kbs       kb  backspace key
       key_catab                  ktbc      ka  clear-all-tabs key
       key_clear                  kclr      kC  clear-screen or erase key
       key_ctab                   kctab     kt  clear-tab key
       key_dc                     kdch1     kD  delete-character key
       key_dl                     kdl1      kL  delete-line key
       key_down                   kcud1     kd  down-arrow key

       key_eic                    krmir     kM  sent by rmir or smir in insert mode
       key_eol                    kel       kE  clear-to-end-of-line key
       key_eos                    ked       kS  clear-to-end-of-screen key
       key_f0                     kf0       k0  F0 function key
       key_f1                     kf1       k1  F1 function key
       key_f10                    kf10      k;  F10 function key
       key_f2                     kf2       k2  F2 function key
       key_f3                     kf3       k3  F3 function key
       key_f4                     kf4       k4  F4 function key
       key_f5                     kf5       k5  F5 function key
       key_f6                     kf6       k6  F6 function key
       key_f7                     kf7       k7  F7 function key
       key_f8                     kf8       k8  F8 function key
       key_f9                     kf9       k9  F9 function key
       key_home                   khome     kh  home key
       key_ic                     kich1     kI  insert-character key
       key_il                     kil1      kA  insert-line key
       key_left                   kcub1     kl  left-arrow key

       key_ll                     kll       kH  lower-left key (home down)
       key_npage                  knp       kN  next-page key
       key_ppage                  kpp       kP  previous-page key
       key_right                  kcuf1     kr  right-arrow key
       key_sf                     kind      kF  scroll-forward key
       key_sr                     kri       kR  scroll-backward key
       key_stab                   khts      kT  set-tab key
       key_up                     kcuu1     ku  up-arrow key
       keypad_local               rmkx      ke  leave keyboard transmit mode
       keypad_xmit                smkx      ks  enter keyboard transmit mode
       lab_f0                     lf0       l0  label on function key f0 if not f0
       lab_f1                     lf1       l1  label on function key f1 if not f1
       lab_f10                    lf10      la  label on function key f10 if not f10
       lab_f2                     lf2       l2  label on function key f2 if not f2
       lab_f3                     lf3       l3  label on function key f3 if not f3
       lab_f4                     lf4       l4  label on function key f4 if not f4
       lab_f5                     lf5       l5  label on function key f5 if not f5
       lab_f6                     lf6       l6  label on function key f6 if not f6
       lab_f7                     lf7       l7  label on function key f7 if not f7
       lab_f8                     lf8       l8  label on function key f8 if not f8
       lab_f9                     lf9       l9  label on function key f9 if not f9
       meta_off                   rmm       mo  turn off meta mode
       meta_on                    smm       mm  turn on meta mode (8th-bit on)
       newline                    nel       nw  newline (behave like cr followed by lf)
       pad_char                   pad       pc  padding char (instead of null)
       parm_dch                   dch       DC  delete #1 characters (P*)
       parm_delete_line           dl        DL  delete #1 lines (P*)
       parm_down_cursor           cud       DO  down #1 lines (P*)
       parm_ich                   ich       IC  insert #1 characters (P*)
       parm_index                 indn      SF  scroll forward #1 lines (P)
       parm_insert_line           il        AL  insert #1 lines (P*)
       parm_left_cursor           cub       LE  move #1 characters to the left (P)
       parm_right_cursor          cuf       RI  move #1 characters to the right (P*)
       parm_rindex                rin       SR  scroll back #1 lines (P)
       parm_up_cursor             cuu       UP  up #1 lines (P*)
       pkey_key                   pfkey     pk  program function key #1 to type string #2
       pkey_local                 pfloc     pl  program function key #1 to execute string #2
       pkey_xmit                  pfx       px  program function key #1 to transmit string #2
       print_screen               mc0       ps  print contents of screen
       prtr_off                   mc4       pf  turn off printer
       prtr_on                    mc5       po  turn on printer
       repeat_char                rep       rp  repeat char #1 #2 times (P*)
       reset_1string              rs1       r1  reset string
       reset_2string              rs2       r2  reset string

       reset_3string              rs3       r3  reset string
       reset_file                 rf        rf  name of reset file
       restore_cursor             rc        rc  restore cursor to position of last save_cursor
       row_address                vpa       cv  vertical position #1 absolute (P)
       save_cursor                sc        sc  save current cursor position (P)
       scroll_forward             ind       sf  scroll text up (P)
       scroll_reverse             ri        sr  scroll text down (P)
       set_attributes             sgr       sa  define video attributes #1-#9 (PG9)
       set_tab                    hts       st  set a tab in every row, current columns
       set_window                 wind      wi  current window is lines #1-#2 cols #3-#4
       tab                        ht        ta  tab to next 8-space hardware tab stop
       to_status_line             tsl       ts  move to status line, column #1
       underline_char             uc        uc  underline char and move past it
       up_half_line               hu        hu  half a line up
       init_prog                  iprog     iP  path name of program for initialization
       key_a1                     ka1       K1  upper left of keypad
       key_a3                     ka3       K3  upper right of keypad
       key_b2                     kb2       K2  center of keypad
       key_c1                     kc1       K4  lower left of keypad
       key_c3                     kc3       K5  lower right of keypad
       prtr_non                   mc5p      pO  turn on printer for #1 bytes

       char_padding               rmp       rP  like ip but when in insert mode
       acs_chars                  acsc      ac  graphics charset pairs, based on vt100
       plab_norm                  pln       pn  program label #1 to show string #2
       key_btab                   kcbt      kB  back-tab key
       enter_xon_mode             smxon     SX  turn on xon/xoff handshaking
       exit_xon_mode              rmxon     RX  turn off xon/xoff handshaking
       enter_am_mode              smam      SA  turn on automatic margins
       exit_am_mode               rmam      RA  turn off automatic margins
       xon_character              xonc      XN  XON character
       xoff_character             xoffc     XF  XOFF character
       ena_acs                    enacs     eA  enable alternate char set
       label_on                   smln      LO  turn on soft labels
       label_off                  rmln      LF  turn off soft labels
       key_beg                    kbeg      @1  begin key
       key_cancel                 kcan      @2  cancel key
       key_close                  kclo      @3  close key
       key_command                kcmd      @4  command key
       key_copy                   kcpy      @5  copy key
       key_create                 kcrt      @6  create key
       key_end                    kend      @7  end key
       key_enter                  kent      @8  enter/send key
       key_exit                   kext      @9  exit key
       key_find                   kfnd      @0  find key
       key_help                   khlp      %1  help key
       key_mark                   kmrk      %2  mark key
       key_message                kmsg      %3  message key
       key_move                   kmov      %4  move key
       key_next                   knxt      %5  next key
       key_open                   kopn      %6  open key
       key_options                kopt      %7  options key
       key_previous               kprv      %8  previous key
       key_print                  kprt      %9  print key
       key_redo                   krdo      %0  redo key
       key_reference              kref      &1  reference key
       key_refresh                krfr      &2  refresh key
       key_replace                krpl      &3  replace key
       key_restart                krst      &4  restart key
       key_resume                 kres      &5  resume key
       key_save                   ksav      &6  save key
       key_suspend                kspd      &7  suspend key
       key_undo                   kund      &8  undo key

       key_sbeg                   kBEG      &9  shifted begin key
       key_scancel                kCAN      &0  shifted cancel key
       key_scommand               kCMD      *1  shifted command key
       key_scopy                  kCPY      *2  shifted copy key
       key_screate                kCRT      *3  shifted create key
       key_sdc                    kDC       *4  shifted delete-character key
       key_sdl                    kDL       *5  shifted delete-line key
       key_select                 kslt      *6  select key
       key_send                   kEND      *7  shifted end key
       key_seol                   kEOL      *8  shifted clear-to-end-of-line key
       key_sexit                  kEXT      *9  shifted exit key
       key_sfind                  kFND      *0  shifted find key
       key_shelp                  kHLP      #1  shifted help key
       key_shome                  kHOM      #2  shifted home key
       key_sic                    kIC       #3  shifted insert-character key
       key_sleft                  kLFT      #4  shifted left-arrow key
       key_smessage               kMSG      %a  shifted message key
       key_smove                  kMOV      %b  shifted move key
       key_snext                  kNXT      %c  shifted next key
       key_soptions               kOPT      %d  shifted options key
       key_sprevious              kPRV      %e  shifted previous key
       key_sprint                 kPRT      %f  shifted print key
       key_sredo                  kRDO      %g  shifted redo key
       key_sreplace               kRPL      %h  shifted replace key

       key_sright                 kRIT      %i  shifted right-arrow key
       key_srsume                 kRES      %j  shifted resume key
       key_ssave                  kSAV      !1  shifted save key
       key_ssuspend               kSPD      !2  shifted suspend key
       key_sundo                  kUND      !3  shifted undo key
       req_for_input              rfi       RF  send next input char (for ptys)
       key_f11                    kf11      F1  F11 function key
       key_f12                    kf12      F2  F12 function key
       key_f13                    kf13      F3  F13 function key
       key_f14                    kf14      F4  F14 function key
       key_f15                    kf15      F5  F15 function key
       key_f16                    kf16      F6  F16 function key
       key_f17                    kf17      F7  F17 function key
       key_f18                    kf18      F8  F18 function key
       key_f19                    kf19      F9  F19 function key
       key_f20                    kf20      FA  F20 function key
       key_f21                    kf21      FB  F21 function key
       key_f22                    kf22      FC  F22 function key
       key_f23                    kf23      FD  F23 function key
       key_f24                    kf24      FE  F24 function key
       key_f25                    kf25      FF  F25 function key
       key_f26                    kf26      FG  F26 function key
       key_f27                    kf27      FH  F27 function key
       key_f28                    kf28      FI  F28 function key
       key_f29                    kf29      FJ  F29 function key
       key_f30                    kf30      FK  F30 function key
       key_f31                    kf31      FL  F31 function key
       key_f32                    kf32      FM  F32 function key
       key_f33                    kf33      FN  F33 function key
       key_f34                    kf34      FO  F34 function key
       key_f35                    kf35      FP  F35 function key
       key_f36                    kf36      FQ  F36 function key
       key_f37                    kf37      FR  F37 function key
       key_f38                    kf38      FS  F38 function key
       key_f39                    kf39      FT  F39 function key
       key_f40                    kf40      FU  F40 function key
       key_f41                    kf41      FV  F41 function key
       key_f42                    kf42      FW  F42 function key

       key_f43                    kf43      FX  F43 function key
       key_f44                    kf44      FY  F44 function key
       key_f45                    kf45      FZ  F45 function key
       key_f46                    kf46      Fa  F46 function key
       key_f47                    kf47      Fb  F47 function key
       key_f48                    kf48      Fc  F48 function key
       key_f49                    kf49      Fd  F49 function key
       key_f50                    kf50      Fe  F50 function key
       key_f51                    kf51      Ff  F51 function key
       key_f52                    kf52      Fg  F52 function key
       key_f53                    kf53      Fh  F53 function key
       key_f54                    kf54      Fi  F54 function key
       key_f55                    kf55      Fj  F55 function key
       key_f56                    kf56      Fk  F56 function key
       key_f57                    kf57      Fl  F57 function key
       key_f58                    kf58      Fm  F58 function key
       key_f59                    kf59      Fn  F59 function key
       key_f60                    kf60      Fo  F60 function key
       key_f61                    kf61      Fp  F61 function key
       key_f62                    kf62      Fq  F62 function key
       key_f63                    kf63      Fr  F63 function key
       clr_bol                    el1       cb  Clear to beginning of line
       clear_margins              mgc       MC  clear right and left soft margins
       set_left_margin            smgl      ML  set left soft margin at current column (not in BSD termcap)
       set_right_margin           smgr      MR  set right soft margin at current column
       label_format               fln       Lf  label format
       set_clock                  sclk      SC  set clock, #1 hrs #2 mins #3 secs

       display_clock              dclk      DK  display clock
       remove_clock               rmclk     RC  remove clock
       create_window              cwin      CW  define a window #1 from #2,#3 to #4,#5
       goto_window                wingo     WG  go to window #1
       hangup                     hup       HU  hang-up phone
       dial_phone                 dial      DI  dial number #1
       quick_dial                 qdial     QD  dial number #1 without checking
       tone                       tone      TO  select touch tone dialing
       pulse                      pulse     PU  select pulse dialing
       flash_hook                 hook      fh  flash switch hook
       fixed_pause                pause     PA  pause for 2-3 seconds
       wait_tone                  wait      WA  wait for dial-tone
       user0                      u0        u0  User string #0
       user1                      u1        u1  User string #1
       user2                      u2        u2  User string #2
       user3                      u3        u3  User string #3
       user4                      u4        u4  User string #4
       user5                      u5        u5  User string #5
       user6                      u6        u6  User string #6
       user7                      u7        u7  User string #7
       user8                      u8        u8  User string #8
       user9                      u9        u9  User string #9
       orig_pair                  op        op  Set default pair to its original value
       orig_colors                oc        oc  Set all color pairs to the original ones
       initialize_color           initc     Ic  initialize color #1 to (#2,#3,#4)
       initialize_pair            initp     Ip  Initialize color pair #1 to fg=(#2,#3,#4), bg=(#5,#6,#7)
       set_color_pair             scp       sp  Set current color pair to #1
       set_foreground             setf      Sf  Set foreground color #1
       set_background             setb      Sb  Set background color #1
       change_char_pitch          cpi       ZA  Change number of characters per inch to #1
       change_line_pitch          lpi       ZB  Change number of lines per inch to #1
       change_res_horz            chr       ZC  Change horizontal resolution to #1
       change_res_vert            cvr       ZD  Change vertical resolution to #1
       define_char                defc      ZE  Define a character #1, #2 dots wide, descender #3
       enter_doublewide_mode      swidm     ZF  Enter double-wide mode

       enter_draft_quality        sdrfq     ZG  Enter draft-quality mode
       enter_italics_mode         sitm      ZH  Enter italic mode
       enter_leftward_mode        slm       ZI  Start leftward carriage motion
       enter_micro_mode           smicm     ZJ  Start micro-motion mode
       enter_near_letter_quality  snlq      ZK  Enter NLQ mode
       enter_normal_quality       snrmq     ZL  Enter normal-quality mode
       enter_shadow_mode          sshm      ZM  Enter shadow-print mode
       enter_subscript_mode       ssubm     ZN  Enter subscript mode
       enter_superscript_mode     ssupm     ZO  Enter superscript mode
       enter_upward_mode          sum       ZP  Start upward carriage motion
       exit_doublewide_mode       rwidm     ZQ  End double-wide mode
       exit_italics_mode          ritm      ZR  End italic mode
       exit_leftward_mode         rlm       ZS  End left-motion mode
       exit_micro_mode            rmicm     ZT  End micro-motion mode
       exit_shadow_mode           rshm      ZU  End shadow-print mode
       exit_subscript_mode        rsubm     ZV  End subscript mode
       exit_superscript_mode      rsupm     ZW  End superscript mode
       exit_upward_mode           rum       ZX  End reverse character motion
       micro_column_address       mhpa      ZY  Like column_address in micro mode
       micro_down                 mcud1     ZZ  Like cursor_down in micro mode
       micro_left                 mcub1     Za  Like cursor_left in micro mode
       micro_right                mcuf1     Zb  Like cursor_right in micro mode
       micro_row_address          mvpa      Zc  Like row_address #1 in micro mode
       micro_up                   mcuu1     Zd  Like cursor_up in micro mode
       order_of_pins              porder    Ze  Match software bits to print-head pins
       parm_down_micro            mcud      Zf  Like parm_down_cursor in micro mode
       parm_left_micro            mcub      Zg  Like parm_left_cursor in micro mode
       parm_right_micro           mcuf      Zh  Like parm_right_cursor in micro mode
       parm_up_micro              mcuu      Zi  Like parm_up_cursor in micro mode
       select_char_set            scs       Zj  Select character set, #1

       set_bottom_margin          smgb      Zk  Set bottom margin at current line
       set_bottom_margin_parm     smgbp     Zl  Set bottom margin at line #1 or (if smgtp is not given) #2 lines
                                                from bottom
       set_left_margin_parm       smglp     Zm  Set left (right) margin at column #1
       set_right_margin_parm      smgrp     Zn  Set right margin at column #1
       set_top_margin             smgt      Zo  Set top margin at current line
       set_top_margin_parm        smgtp     Zp  Set top (bottom) margin at row #1
       start_bit_image            sbim      Zq  Start printing bit image graphics
       start_char_set_def         scsd      Zr  Start character set definition #1, with #2 characters in the set
       stop_bit_image             rbim      Zs  Stop printing bit image graphics
       stop_char_set_def          rcsd      Zt  End definition of character set #1
       subscript_characters       subcs     Zu  List of subscriptable characters
       superscript_characters     supcs     Zv  List of superscriptable characters
       these_cause_cr             docr      Zw  Printing any of these characters causes CR
       zero_motion                zerom     Zx  No motion for subsequent character

       The  following  string  capabilities  are  present  in the SVr4.0 term structure, but were originally not
       documented in the man page.

                                      Code
       String Capability Name     TI        TC  Description
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       char_set_names             csnm      Zy  Produce #1'th item from list of character set names
       key_mouse                  kmous     Km  Mouse event has occurred
       mouse_info                 minfo     Mi  Mouse status information
       req_mouse_pos              reqmp     RQ  Request mouse position
       get_mouse                  getm      Gm  Curses should get button events, parameter #1 not documented.
       set_a_foreground           setaf     AF  Set foreground color to #1, using ANSI escape
       set_a_background           setab     AB  Set background color to #1, using ANSI escape
       pkey_plab                  pfxl      xl  Program function key #1 to type string #2 and show string #3
       device_type                devt      dv  Indicate language, codeset support
       code_set_init              csin      ci  Init sequence for multiple codesets
       set0_des_seq               s0ds      s0  Shift to codeset 0 (EUC set 0, ASCII)
       set1_des_seq               s1ds      s1  Shift to codeset 1
       set2_des_seq               s2ds      s2  Shift to codeset 2
       set3_des_seq               s3ds      s3  Shift to codeset 3
       set_lr_margin              smglr     ML  Set both left and right margins to #1, #2.  (ML is not in BSD
                                                termcap).
       set_tb_margin              smgtb     MT  Sets both top and bottom margins to #1, #2
       bit_image_repeat           birep     Xy  Repeat bit image cell #1 #2 times
       bit_image_newline          binel     Zz  Move to next row of the bit image
       bit_image_carriage_return  bicr      Yv  Move to beginning of same row
       color_names                colornm   Yw  Give name for color #1
       define_bit_image_region    defbi     Yx  Define rectangular bit image region
       end_bit_image_region       endbi     Yy  End a bit-image region
       set_color_band             setcolor  Yz  Change to ribbon color #1
       set_page_length            slines    YZ  Set page length to #1 lines
       display_pc_char            dispc     S1  Display PC character #1
       enter_pc_charset_mode      smpch     S2  Enter PC character display mode
       exit_pc_charset_mode       rmpch     S3  Exit PC character display mode
       enter_scancode_mode        smsc      S4  Enter PC scancode mode
       exit_scancode_mode         rmsc      S5  Exit PC scancode mode
       pc_term_options            pctrm     S6  PC terminal options
       scancode_escape            scesc     S7  Escape for scancode emulation
       alt_scancode_esc           scesa     S8  Alternate escape for scancode emulation

       The  XSI  Curses standard added these hardcopy capabilities.  They were used in some post-4.1 versions of
       System V curses, e.g., Solaris 2.5 and IRIX 6.x.  Except for YI, the ncurses termcap names for  them  are
       invented.   According  to the XSI Curses standard, they have no termcap names.  If your compiled terminfo
       entries use these, they may not be binary-compatible with System V terminfo entries after SVr4.1; beware!

                                      Code
       String Capability Name     TI        TC  Description
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       enter_horizontal_hl_mode   ehhlm     Xh  Enter horizontal highlight mode
       enter_left_hl_mode         elhlm     Xl  Enter left highlight mode

       enter_low_hl_mode          elohlm    Xo  Enter low highlight mode
       enter_right_hl_mode        erhlm     Xr  Enter right highlight mode
       enter_top_hl_mode          ethlm     Xt  Enter top highlight mode
       enter_vertical_hl_mode     evhlm     Xv  Enter vertical highlight mode
       set_a_attributes           sgr1      sA  Define second set of video attributes #1-#6
       set_pglen_inch             slength   YI  Set page length to #1 hundredth of an inch (some implementations
                                                use sL for termcap).

   User-Defined Capabilities
       The  preceding  section  listed  the  predefined  capabilities.  They deal with some special features for
       terminals no longer (or possibly never) produced.  Occasionally  there  are  special  features  of  newer
       terminals which are awkward or impossible to represent by reusing the predefined capabilities.

       ncurses  addresses  this  limitation by allowing user-defined capabilities.  The tic and infocmp programs
       provide the -x option for this purpose.  When -x is set, tic treats unknown capabilities as user-defined.
       That  is,  if  tic encounters a capability name which it does not recognize, it infers its type (Boolean,
       number or string) from  the  syntax  and  makes  an  extended  table  entry  for  that  capability.   The
       use_extended_names(3NCURSES)  function  makes  this  information conditionally available to applications.
       The ncurses library provides the data leaving most of the behavior to applications:

       •   User-defined capability strings whose name begins with “k” are treated as function keys.

       •   The types (Boolean, number, string) determined  by  tic  can  be  inferred  by  successful  calls  on
           tigetflag, etc.

       •   If  the  capability  name  happens to be two characters, the capability is also available through the
           termcap interface.

       While termcap is said to be extensible because it does not use  a  predefined  set  of  capabilities,  in
       practice  it  has been limited to the capabilities defined by terminfo implementations.  As a rule, user-
       defined capabilities intended for use by termcap applications should be limited to Booleans  and  numbers
       to  avoid running past the 1023 byte limit assumed by termcap implementations and their applications.  In
       particular, providing extended sets of function keys (past the  60  numbered  keys  and  the  handful  of
       special named keys) is best done using the longer names available using terminfo.

       The  ncurses  library uses a few of these user-defined capabilities, as described in user_caps(5).  Other
       user-defined capabilities (including function keys) are  described  in  the  terminal  database,  in  the
       section on NCURSES USER-DEFINABLE CAPABILITIES

   A Sample Entry
       The following entry, describing an ANSI-standard terminal, is representative of what a terminfo entry for
       a modern terminal typically looks like.

       ansi|ansi/pc-term compatible with color,
               am, mc5i, mir, msgr,
               colors#8, cols#80, it#8, lines#24, ncv#3, pairs#64,
               acsc=+\020\,\021-\030.^Y0\333`\004a\261f\370g\361h\260
                    j\331k\277l\332m\300n\305o~p\304q\304r\304s_t\303
                    u\264v\301w\302x\263y\363z\362{\343|\330}\234~\376,
               bel=^G, blink=\E[5m, bold=\E[1m, cbt=\E[Z, clear=\E[H\E[J,
               cr=^M, cub=\E[%p1%dD, cub1=\E[D, cud=\E[%p1%dB, cud1=\E[B,
               cuf=\E[%p1%dC, cuf1=\E[C, cup=\E[%i%p1%d;%p2%dH,
               cuu=\E[%p1%dA, cuu1=\E[A, dch=\E[%p1%dP, dch1=\E[P,
               dl=\E[%p1%dM, dl1=\E[M, ech=\E[%p1%dX, ed=\E[J, el=\E[K,
               el1=\E[1K, home=\E[H, hpa=\E[%i%p1%dG, ht=\E[I, hts=\EH,
               ich=\E[%p1%d@, il=\E[%p1%dL, il1=\E[L, ind=^J,
               indn=\E[%p1%dS, invis=\E[8m, kbs=^H, kcbt=\E[Z, kcub1=\E[D,
               kcud1=\E[B, kcuf1=\E[C, kcuu1=\E[A, khome=\E[H, kich1=\E[L,
               mc4=\E[4i, mc5=\E[5i, nel=\r\E[S, op=\E[39;49m,
               rep=%p1%c\E[%p2%{1}%-%db, rev=\E[7m, rin=\E[%p1%dT,
               rmacs=\E[10m, rmpch=\E[10m, rmso=\E[m, rmul=\E[m,
               s0ds=\E(B, s1ds=\E)B, s2ds=\E*B, s3ds=\E+B,
               setab=\E[4%p1%dm, setaf=\E[3%p1%dm,
               sgr=\E[0;10%?%p1%t;7%;
                          %?%p2%t;4%;
                          %?%p3%t;7%;
                          %?%p4%t;5%;
                          %?%p6%t;1%;
                          %?%p7%t;8%;
                          %?%p9%t;11%;m,
               sgr0=\E[0;10m, smacs=\E[11m, smpch=\E[11m, smso=\E[7m,
               smul=\E[4m, tbc=\E[3g, u6=\E[%i%d;%dR, u7=\E[6n,
               u8=\E[?%[;0123456789]c, u9=\E[c, vpa=\E[%i%p1%dd,

       Entries may continue onto multiple lines by placing white space at the beginning of each line except  the
       first.   Comments  may  be  included  on lines beginning with “#”.  Capabilities in terminfo are of three
       types:

       •   Boolean capabilities which indicate that the terminal has some particular feature,

       •   numeric capabilities giving the size of the terminal or the size of particular delays, and

       •   string capabilities, which give  a  sequence  which  can  be  used  to  perform  particular  terminal
           operations.

   Types of Capabilities
       All  capabilities have names.  For instance, the fact that ANSI-standard terminals have automatic margins
       (i.e., an automatic return and line-feed when the  end  of  a  line  is  reached)  is  indicated  by  the
       capability  am.   Hence  the  description  of ansi includes am.  Numeric capabilities are followed by the
       character “#” and then a positive value.  Thus cols, which indicates the number of columns  the  terminal
       has,  gives the value “80” for ansi.  Values for numeric capabilities may be specified in decimal, octal,
       or hexadecimal, using the C programming language conventions (e.g., 255, 0377 and 0xff or 0xFF).

       Finally, string valued capabilities, such as el (clear to end of line sequence) are  given  by  the  two-
       character code, an “=”, and then a string ending at the next following “,”.

       A  number  of  escape  sequences  are  provided  in  the  string valued capabilities for easy encoding of
       characters there:

       •   Both \E and \e map to an ESCAPE character,

       •   ^x maps to a control-x for any appropriate x, and

       •   the sequences

             \n, \l, \r, \t, \b, \f, and \s

           produce

             newline, line-feed, return, tab, backspace, form-feed, and space,

           respectively.

       X/Open Curses does not say what “appropriate x” might be.  In practice, that is a printable ASCII graphic
       character.   The  special case “^?” is interpreted as DEL (127).  In all other cases, the character value
       is AND'd with 0x1f, mapping to ASCII control codes in the range 0 through 31.

       Other escapes include

       •   \^ for ^,

       •   \\ for \,

       •   \, for comma,

       •   \: for :,

       •   and \0 for null.

           \0 will produce \200, which does not terminate a string but behaves  as  a  null  character  on  most
           terminals, providing CS7 is specified.  See stty(1).

           The  reason  for  this  quirk is to maintain binary compatibility of the compiled terminfo files with
           other implementations, e.g., the SVr4 systems, which document  this.   Compiled  terminfo  files  use
           null-terminated  strings,  with  no lengths.  Modifying this would require a new binary format, which
           would not work with other implementations.

       Finally, characters may be given as three octal digits after a \.

       A delay in milliseconds may appear anywhere in a string capability, enclosed in  $<..>  brackets,  as  in
       el=\EK$<5>, and padding characters are supplied by tputs(3NCURSES) to provide this delay.

       •   The  delay  must  be  a  number  with  at  most one decimal place of precision; it may be followed by
           suffixes “*” or “/” or both.

       •   A “*” indicates that the padding required is proportional to the number  of  lines  affected  by  the
           operation,  and  the  amount given is the per-affected-unit padding required.  (In the case of insert
           character, the factor is still the number of lines affected.)

           Normally, padding is advisory if the device has the xon capability; it is used for  cost  computation
           but does not trigger delays.

       •   A  “/”  suffix  indicates  that  the  padding  is mandatory and forces a delay of the given number of
           milliseconds even on devices for which xon is present to indicate flow control.

       Sometimes individual capabilities must be commented out.  To do this, put a period before the  capability
       name.  For example, see the second ind in the example above.

   Fetching Compiled Descriptions
       Terminal  descriptions  in ncurses are stored in terminal databases.  These databases, which are found by
       their pathname, may be configured either as directory trees or hashed databases (see term(5)),

       The library uses a compiled-in list of pathnames, which  can  be  overridden  by  environment  variables.
       Before  starting to search, ncurses checks the search list, eliminating duplicates and pathnames where no
       terminal database is found.  The ncurses library reads the first description which passes its consistency
       checks.

       •   The  environment  variable TERMINFO is checked first, for a terminal database containing the terminal
           description.

       •   Next, ncurses looks in $HOME/.terminfo for a compiled description.

           This is an optional feature which may be omitted entirely from the library,  or  limited  to  prevent
           accidental use by privileged applications.

       •   Next,  if  the  environment  variable  TERMINFO_DIRS  is set, ncurses interprets the contents of that
           variable as a list of colon-separated pathnames of terminal databases to be searched.

           An empty pathname (i.e., if the variable begins or ends with a colon, or contains adjacent colons) is
           interpreted as the system location /etc/terminfo.

       •   Finally, ncurses searches these compiled-in locations:

           •   a list of directories (/etc/terminfo:/lib/terminfo:/usr/share/terminfo), and

           •   the system terminfo directory, /etc/terminfo

       The  TERMINFO variable can contain a terminal description instead of the pathname of a terminal database.
       If this variable begins with “hex:” or “b64:” then ncurses reads a terminal description from hexadecimal-
       or  base64-encoded  data,  and  if that description matches the name sought, will use that.  This encoded
       data can be set using the “-Q” option of tic or infocmp.

       The preceding addresses the usual configuration of ncurses, which uses terminal descriptions prepared  in
       terminfo  format.   While  termcap  is  less  expressive,  ncurses can also be configured to read termcap
       descriptions.  In that configuration, it checks the TERMCAP  and  TERMPATH  variables  (for  content  and
       search path, respectively) after the system terminal database.

   Preparing Descriptions
       We  now  outline  how to prepare descriptions of terminals.  The most effective way to prepare a terminal
       description is by imitating the description of  a  similar  terminal  in  terminfo  and  to  build  up  a
       description  gradually, using partial descriptions with vi or some other screen-oriented program to check
       that they are correct.  Be aware that a very unusual terminal may expose deficiencies in the  ability  of
       the terminfo file to describe it or bugs in the screen-handling code of the test program.

       To get the padding for insert line right (if the terminal manufacturer did not document it) a severe test
       is to edit a large file at 9600 baud, delete 16 or so lines from the middle of the screen, then  hit  the
       “u”  key  several  times  quickly.  If the terminal messes up, more padding is usually needed.  A similar
       test can be used for insert character.

   Basic Capabilities
       The number of columns on each line for the terminal is given by the  cols  numeric  capability.   If  the
       terminal  is  a  CRT,  then  the  number of lines on the screen is given by the lines capability.  If the
       terminal wraps around to the beginning of the next line when it reaches the right margin, then it  should
       have  the  am capability.  If the terminal can clear its screen, leaving the cursor in the home position,
       then this is given by the clear string capability.  If the terminal overstrikes (rather than  clearing  a
       position  when  a  character is struck over) then it should have the os capability.  If the terminal is a
       printing terminal, with no soft copy unit, give it  both  hc  and  os.   (os  applies  to  storage  scope
       terminals, such as TEKTRONIX 4010 series, as well as hard copy and APL terminals.)  If there is a code to
       move the cursor to the left edge of the current row, give this as cr.  (Normally this  will  be  carriage
       return, control/M.)  If there is a code to produce an audible signal (bell, beep, etc) give this as bel.

       If there is a code to move the cursor one position to the left (such as backspace) that capability should
       be given as cub1.  Similarly, codes to move to the right, up, and down should be given as cuf1, cuu1, and
       cud1.   These  local  cursor motions should not alter the text they pass over, for example, you would not
       normally use “cuf1= ” because the space would erase the character moved over.

       A very important point here is that the local cursor motions encoded in terminfo  are  undefined  at  the
       left  and  top edges of a CRT terminal.  Programs should never attempt to backspace around the left edge,
       unless bw is given, and never attempt to go up locally off the top.   In  order  to  scroll  text  up,  a
       program will go to the bottom left corner of the screen and send the ind (index) string.

       To scroll text down, a program goes to the top left corner of the screen and sends the ri (reverse index)
       string.  The strings ind and ri are undefined when not on their respective corners of the screen.

       Parameterized versions of the scrolling sequences are indn and rin which have the same semantics  as  ind
       and  ri  except that they take one parameter, and scroll that many lines.  They are also undefined except
       at the appropriate edge of the screen.

       The am capability tells whether the cursor sticks at the right edge of the screen when  text  is  output,
       but  this  does  not  necessarily  apply  to a cuf1 from the last column.  The only local motion which is
       defined from the left edge is if bw is given, then a cub1 from the left edge will move to the right  edge
       of  the  previous  row.   If  bw is not given, the effect is undefined.  This is useful for drawing a box
       around the edge of the screen, for example.  If the terminal has switch selectable automatic margins, the
       terminfo  file  usually  assumes that this is on; i.e., am.  If the terminal has a command which moves to
       the first column of the next line, that command can be given as nel (newline).  It does not matter if the
       command  clears  the  remainder  of the current line, so if the terminal has no cr and lf it may still be
       possible to craft a working nel out of one or both of them.

       These capabilities suffice to describe hard-copy and “glass-tty” terminals.  Thus the model  33  teletype
       is described as

       33|tty33|tty|model 33 teletype,
               bel=^G, cols#72, cr=^M, cud1=^J, hc, ind=^J, os,

       while the Lear Siegler ADM-3 is described as

       adm3|3|lsi adm3,
               am, bel=^G, clear=^Z, cols#80, cr=^M, cub1=^H, cud1=^J,
               ind=^J, lines#24,

   Parameterized Strings
       Cursor addressing and other strings requiring parameters in the terminal are described by a parameterized
       string capability, with printf-like escapes such as %x in it.  For example, to address  the  cursor,  the
       cup  capability  is given, using two parameters: the row and column to address to.  (Rows and columns are
       numbered from zero and refer to the physical screen visible to the user, not to any unseen  memory.)   If
       the terminal has memory relative cursor addressing, that can be indicated by mrcup.

       The  parameter  mechanism  uses  a stack and special % codes to manipulate it.  Typically a sequence will
       push one of the parameters onto the stack and then print it in some format.   Print  (e.g.,  “%d”)  is  a
       special  case.  Other operations, including “%t” pop their operand from the stack.  It is noted that more
       complex operations are often necessary, e.g., in the sgr string.

       The % encodings have the following meanings:

       %%   outputs “%”

       %[[:]flags][width[.precision]][doxXs]
            as in printf(3), flags are [-+#] and space.  Use a “:” to allow the next character to be a “-” flag,
            avoiding interpreting “%-” as an operator.

       %c   print pop() like %c in printf

       %s   print pop() like %s in printf

       %p[1-9]
            push i'th parameter

       %P[a-z]
            set dynamic variable [a-z] to pop()

       %g[a-z]
            get dynamic variable [a-z] and push it

       %P[A-Z]
            set static variable [a-z] to pop()

       %g[A-Z]
            get static variable [a-z] and push it

            The  terms “static” and “dynamic” are misleading.  Historically, these are simply two different sets
            of variables, whose values are not reset between calls to tparm(3NCURSES).  However,  that  fact  is
            not  documented  in other implementations.  Relying on it will adversely impact portability to other
            implementations:

            •   SVr2 curses supported dynamic variables.  Those are set only by a %P operator.  A %g for a given
                variable  without  first  setting  it  with  %P will give unpredictable results, because dynamic
                variables are an uninitialized local array on the stack in the tparm function.

            •   SVr3.2 curses supported static  variables.   Those  are  an  array  in  the  TERMINAL  structure
                (declared  in  term.h),  and  are zeroed automatically when the setupterm function allocates the
                data.

            •   SVr4 curses made no further improvements to the dynamic/static variable feature.

            •   Solaris XPG4 curses does not distinguish between dynamic and static  variables.   They  are  the
                same.  Like SVr4 curses, XPG4 curses does not initialize these explicitly.

            •   Before  version  6.3,  ncurses  stores  both dynamic and static variables in persistent storage,
                initialized to zeros.

            •   Beginning with version 6.3, ncurses stores static and dynamic variables in the  same  manner  as
                SVr4.

                •   Unlike  other  implementations,  ncurses  zeros  dynamic variables before the first %g or %P
                    operator.

                •   Like SVr2, the scope of dynamic variables in ncurses is within the current  call  to  tparm.
                    Use static variables if persistent storage is needed.

       %'c' char constant c

       %{nn}
            integer constant nn

       %l   push strlen(pop)

       %+, %-, %*, %/, %m
            arithmetic (%m is mod): push(pop() op pop())

       %&, %|, %^
            bit operations (AND, OR and exclusive-OR): push(pop() op pop())

       %=, %>, %<
            logical operations: push(pop() op pop())

       %A, %O
            logical AND and OR operations (for conditionals)

       %!, %~
            unary operations (logical and bit complement): push(op pop())

       %i   add 1 to first two parameters (for ANSI terminals)

       %? expr %t thenpart %e elsepart %;
            This  forms  an if-then-else.  The %e elsepart is optional.  Usually the %? expr part pushes a value
            onto the stack, and %t pops it from the stack, testing if it is  nonzero  (true).   If  it  is  zero
            (false), control passes to the %e (else) part.

            It is possible to form else-if's a la Algol 68:
            %? c1 %t b1 %e c2 %t b2 %e c3 %t b3 %e c4 %t b4 %e %;

            where ci are conditions, bi are bodies.

            Use the -f option of tic or infocmp to see the structure of if-then-else's.  Some strings, e.g., sgr
            can be very complicated when written on one line.  The -f option splits the string into  lines  with
            the parts indented.

       Binary  operations  are  in  postfix  form with the operands in the usual order.  That is, to get x-5 one
       would use “%gx%{5}%-”.  %P and %g variables are persistent across escape-string evaluations.

       Consider the HP2645, which, to get to row 3 and column 12, needs to  be  sent  \E&a12c03Y  padded  for  6
       milliseconds.   The order of the rows and columns is inverted here, and the row and column are printed as
       two digits.  The corresponding terminal description is expressed thus:
              cup=\E&a%p2%dc%p1%dY$<6>,

       The Microterm ACT-IV needs the current row and column sent preceded by a ^T,  with  the  row  and  column
       simply encoded in binary,
              cup=^T%p1%c%p2%c

       Terminals  which  use  “%c” need to be able to backspace the cursor (cub1), and to move the cursor up one
       line on the screen (cuu1).  This is necessary because it is not always safe to transmit \n ^D and \r,  as
       the system may change or discard them.  (The library routines dealing with terminfo set tty modes so that
       tabs are never expanded, so \t is safe to send.  This turns out to be essential for the Ann Arbor 4080.)

       A final example is the LSI ADM-3a, which uses row and column offset by a blank character, thus
              cup=\E=%p1%' '%+%c%p2%' '%+%c

       After sending “\E=”, this pushes the first parameter, pushes the ASCII value for a space (32), adds  them
       (pushing the sum on the stack in place of the two previous values) and outputs that value as a character.
       Then the same is done for the second parameter.  More complex arithmetic is possible using the stack.

   Cursor Motions
       If the terminal has a fast way to home the cursor (to very upper left corner of screen) then this can  be
       given as home; similarly a fast way of getting to the lower left-hand corner can be given as ll; this may
       involve going up with cuu1 from the home position, but a program should never do this itself  (unless  ll
       does)  because it can make no assumption about the effect of moving up from the home position.  Note that
       the home position is the same as addressing to (0,0): to the top  left  corner  of  the  screen,  not  of
       memory.  (Thus, the \EH sequence on HP terminals cannot be used for home.)

       If  the  terminal  has  row  or column absolute cursor addressing, these can be given as single parameter
       capabilities hpa (horizontal position absolute) and vpa (vertical position  absolute).   Sometimes  these
       are  shorter  than  the  more  general  two  parameter  sequence  (as with the hp2645) and can be used in
       preference to cup.  If there are parameterized local motions (e.g., move n spaces to the right) these can
       be given as cud, cub, cuf, and cuu with a single parameter indicating how many spaces to move.  These are
       primarily useful if the terminal does not have cup, such as the TEKTRONIX 4025.

       If the terminal needs to be in a special mode when running a program that uses  these  capabilities,  the
       codes  to  enter  and  exit  this  mode  can be given as smcup and rmcup.  This arises, for example, from
       terminals like the Concept with more than one page of memory.  If the terminal has only  memory  relative
       cursor addressing and not screen relative cursor addressing, a one screen-sized window must be fixed into
       the terminal for cursor addressing to work properly.  This is also used for  the  TEKTRONIX  4025,  where
       smcup  sets the command character to be the one used by terminfo.  If the smcup sequence will not restore
       the screen after an rmcup sequence is output (to the state prior to outputting rmcup), specify nrrmc.

   Margins
       SVr4 (and X/Open Curses) list several string capabilities for setting margins.  Two were intended for use
       with terminals, and another six were intended for use with printers.

       •   The  two  terminal  capabilities assume that the terminal may have the capability of setting the left
           and/or right margin at the current cursor column position.

       •   The printer capabilities assume that the printer may have two types of capability:

           •   the ability to set a top and/or bottom margin using the current line position, and

           •   parameterized capabilities for setting the top, bottom, left, right margins given the  number  of
               rows or columns.

       In practice, the categorization into “terminal” and “printer” is not suitable:

       •   The AT&T SVr4 terminal database uses smgl four times, for AT&T hardware.

           Three  of  the  four are printers.  They lack the ability to set left/right margins by specifying the
           column.

       •   Other (non-AT&T) terminals may support margins but using different assumptions from AT&T.

           For instance, the DEC VT420 supports left/right margins, but only using a column  parameter.   As  an
           added complication, the VT420 uses two settings to fully enable left/right margins (left/right margin
           mode, and origin mode).  The former enables the margins, which causes printed  text  to  wrap  within
           margins, but the latter is needed to prevent cursor-addressing outside those margins.

       •   Both  DEC VT420 left/right margins are set with a single control sequence.  If either is omitted, the
           corresponding margin is set to the left or right edge of the display (rather than leaving the  margin
           unmodified).

       These are the margin-related capabilities:

                                  Name    Description
                                  ───────────────────────────────────────────────────
                                  smgl    Set left margin at current column
                                  smgr    Set right margin at current column
                                  smgb    Set bottom margin at current line
                                  smgt    Set top margin at current line
                                  smgbp   Set bottom margin at line N
                                  smglp   Set left margin at column N
                                  smgrp   Set right margin at column N
                                  smgtp   Set top margin at line N
                                  smglr   Set both left and right margins to L and R
                                  smgtb   Set both top and bottom margins to T and B

       When writing an application that uses these string capabilities, the pairs should be first checked to see
       if each capability in the pair is set or only one is set:

       •   If both smglp and smgrp are set, each is used with a single argument, N, that gives the column number
           of the left and right margin, respectively.

       •   If both smgtp and smgbp are set, each is used to set the top and bottom margin, respectively:

           •   smgtp is used with a single argument, N, the line number of the top margin.

           •   smgbp  is  used  with two arguments, N and M, that give the line number of the bottom margin, the
               first counting from the top  of  the  page  and  the  second  counting  from  the  bottom.   This
               accommodates the two styles of specifying the bottom margin in different manufacturers' printers.

           When  designing  a  terminfo entry for a printer that has a settable bottom margin, only the first or
           second argument should be used, depending on the printer.  When developing an application  that  uses
           smgbp to set the bottom margin, both arguments must be given.

       Conversely, when only one capability in the pair is set:

       •   If  only  one of smglp and smgrp is set, then it is used with two arguments, the column number of the
           left and right margins, in that order.

       •   Likewise, if only one of smgtp and smgbp is set, then it is used with two arguments that give the top
           and bottom margins, in that order, counting from the top of the page.

           When  designing  a  terminfo entry for a printer that requires setting both left and right or top and
           bottom margins simultaneously, only one capability in the pairs smglp and smgrp or  smgtp  and  smgbp
           should be defined, leaving the other unset.

       Except  for  very  old  terminal  descriptions, e.g., those developed for SVr4, the scheme just described
       should be considered obsolete.  An improved set of capabilities was  added  late  in  the  SVr4  releases
       (smglr and smgtb), which explicitly use two parameters for setting the left/right or top/bottom margins.

       When setting margins, the line- and column-values are zero-based.

       The  mgc  string  capability should be defined.  Applications such as tabs(1) rely upon this to reset all
       margins.

   Area Clears
       If the terminal can clear from the current position to the end of the line, leaving the cursor  where  it
       is,  this should be given as el.  If the terminal can clear from the beginning of the line to the current
       position inclusive, leaving the cursor where it is, this should be given as el1.   If  the  terminal  can
       clear  from  the current position to the end of the display, then this should be given as ed.  Ed is only
       defined from the first column of a line.  (Thus, it can be simulated by  a  request  to  delete  a  large
       number of lines, if a true ed is not available.)

   Insert/Delete Line and Vertical Motions
       If  the  terminal  can open a new blank line before the line where the cursor is, this should be given as
       il1; this is done only from the first position of a line.  The cursor must then appear on the newly blank
       line.  If the terminal can delete the line which the cursor is on, then this should be given as dl1; this
       is done only from the first position on the line to be deleted.  Versions of il1 and  dl1  which  take  a
       single parameter and insert or delete that many lines can be given as il and dl.

       If the terminal has a settable scrolling region (like the vt100) the command to set this can be described
       with the csr capability, which takes two parameters: the top and bottom lines of  the  scrolling  region.
       The cursor position is, alas, undefined after using this command.

       It  is  possible to get the effect of insert or delete line using csr on a properly chosen region; the sc
       and rc (save and restore cursor) commands may be useful for ensuring that your synthesized  insert/delete
       string  does  not  move  the  cursor.   (Note  that  the  ncurses(3NCURSES)  library  does this synthesis
       automatically, so you need not compose insert/delete strings for an entry with csr).

       Yet another way to construct insert and delete might be to use a combination of index  with  the  memory-
       lock feature found on some terminals (like the HP-700/90 series, which however also has insert/delete).

       Inserting  lines  at  the  top or bottom of the screen can also be done using ri or ind on many terminals
       without a true insert/delete line, and is often faster even on terminals with those features.

       The Boolean non_dest_scroll_region should be set if each scrolling window is effectively a view port on a
       screen-sized canvas.  To test for this capability, create a scrolling region in the middle of the screen,
       write something to the bottom line, move the cursor to the top of the region, and do ri followed  by  dl1
       or  ind.   If the data scrolled off the bottom of the region by the ri re-appears, then scrolling is non-
       destructive.  System V and X/Open Curses expect that ind, ri, indn, and  rin  will  simulate  destructive
       scrolling;  their  documentation  cautions  you  not  to  define  csr  unless  this is true.  This curses
       implementation is more liberal and will do explicit erases after scrolling if ndsrc is defined.

       If the terminal has the ability to define a window as part of  memory,  which  all  commands  affect,  it
       should  be given as the parameterized string wind.  The four parameters are the starting and ending lines
       in memory and the starting and ending columns in memory, in that order.

       If the terminal can retain display memory above, then the da  capability  should  be  given;  if  display
       memory  can be retained below, then db should be given.  These indicate that deleting a line or scrolling
       may bring non-blank lines up from below or that scrolling back with ri may bring down non-blank lines.

   Insert/Delete Character
       There are two basic kinds of intelligent terminals with respect to insert/delete character which  can  be
       described  using terminfo.  The most common insert/delete character operations affect only the characters
       on the current line and shift characters off the end of the line rigidly.  Other terminals, such  as  the
       Concept  100 and the Perkin Elmer Owl, make a distinction between typed and untyped blanks on the screen,
       shifting upon an insert or delete only to an untyped blank on the screen which is either  eliminated,  or
       expanded to two untyped blanks.

       You  can determine the kind of terminal you have by clearing the screen and then typing text separated by
       cursor motions.  Type “abc    def” using local cursor motions (not spaces)  between  the  “abc”  and  the
       “def”.   Then  position  the  cursor  before  the  “abc”  and put the terminal in insert mode.  If typing
       characters causes the rest of the line to shift rigidly and characters to fall off  the  end,  then  your
       terminal  does  not  distinguish  between  blanks and untyped positions.  If the “abc” shifts over to the
       “def” which then move together around the end of the current line and onto the next as  you  insert,  you
       have the second type of terminal, and should give the capability in, which stands for “insert null”.

       While  these  are  two logically separate attributes (one line versus multi-line insert mode, and special
       treatment of untyped spaces) we have seen no terminals whose insert mode cannot  be  described  with  the
       single attribute.

       Terminfo  can  describe  both  terminals  which  have  an  insert mode, and terminals which send a simple
       sequence to open a blank position on the current line.  Give as smir the  sequence  to  get  into  insert
       mode.   Give  as rmir the sequence to leave insert mode.  Now give as ich1 any sequence needed to be sent
       just before sending the character to be inserted.  Most terminals with a true insert mode will  not  give
       ich1; terminals which send a sequence to open a screen position should give it here.

       If  your  terminal has both, insert mode is usually preferable to ich1.  Technically, you should not give
       both unless the terminal actually requires both to be used in combination.  Accordingly, some  non-curses
       applications  get  confused  if  both  are  present; the symptom is doubled characters in an update using
       insert.  This requirement is now rare; most ich sequences do not require previous  smir,  and  most  smir
       insert  modes do not require ich1 before each character.  Therefore, the new curses actually assumes this
       is the case and uses either rmir/smir or ich/ich1 as appropriate (but not both).  If you have to write an
       entry to be used under new curses for a terminal old enough to need both, include the rmir/smir sequences
       in ich1.

       If post insert padding is needed, give this as a number of milliseconds in ip  (a  string  option).   Any
       other  sequence  which may need to be sent after an insert of a single character may also be given in ip.
       If your terminal needs both to be placed into an “insert  mode”  and  a  special  code  to  precede  each
       inserted  character,  then  both  smir/rmir  and  ich1  can  be  given,  and  both will be used.  The ich
       capability, with one parameter, n, will repeat the effects of ich1 n times.

       If padding is necessary between characters typed while not in insert mode,  give  this  as  a  number  of
       milliseconds padding in rmp.

       It  is  occasionally  necessary to move around while in insert mode to delete characters on the same line
       (e.g., if there is a tab after the insertion position).  If your terminal allows motion while  in  insert
       mode  you  can give the capability mir to speed up inserting in this case.  Omitting mir will affect only
       speed.  Some terminals (notably Datamedia's) must not have mir because  of  the  way  their  insert  mode
       works.

       Finally,  you  can  specify  dch1  to  delete  a  single  character, dch with one parameter, n, to delete
       ncharacters, and delete mode by giving smdc and rmdc to enter and exit delete mode (any mode the terminal
       needs to be placed in for dch1 to work).

       A  command  to  erase  n  characters (equivalent to outputting n blanks without moving the cursor) can be
       given as ech with one parameter.

   Highlighting, Underlining, and Visible Bells
       If your terminal has one or more kinds of display attributes, these can be represented  in  a  number  of
       different ways.  You should choose one display form as standout mode, representing a good, high contrast,
       easy-on-the-eyes, format for highlighting error messages and other attention getters.   (If  you  have  a
       choice, reverse video plus half-bright is good, or reverse video alone.)  The sequences to enter and exit
       standout mode are given as smso and rmso, respectively.  If the code to change into or  out  of  standout
       mode  leaves  one  or  even  two blank spaces on the screen, as the TVI 912 and Teleray 1061 do, then xmc
       should be given to tell how many spaces are left.

       Codes to begin underlining and end underlining can be given  as  smul  and  rmul  respectively.   If  the
       terminal  has  a code to underline the current character and move the cursor one space to the right, such
       as the Microterm Mime, this can be given as uc.

       Other capabilities to enter various highlighting modes include  blink  (blinking)  bold  (bold  or  extra
       bright)  dim (dim or half-bright) invis (blanking or invisible text) prot (protected) rev (reverse video)
       sgr0 (turn off all attribute modes) smacs (enter alternate character set mode) and rmacs (exit  alternate
       character set mode).  Turning on any of these modes singly may or may not turn off other modes.

       If  there  is  a  sequence  to  set  arbitrary  combinations  of  modes, this should be given as sgr (set
       attributes), taking 9 parameters.  Each parameter is either zero (0) or  nonzero,  as  the  corresponding
       attribute  is on or off.  The 9 parameters are, in order: standout, underline, reverse, blink, dim, bold,
       blank, protect, alternate character set.  Not all modes need be supported by sgr, only  those  for  which
       corresponding separate attribute commands exist.

       For example, the DEC vt220 supports most of the modes:

                                    tparm Parameter   Attribute    Escape Sequence
                                    ────────────────────────────────────────────────
                                    none              none         \E[0m
                                    p1                standout     \E[0;1;7m
                                    p2                underline    \E[0;4m
                                    p3                reverse      \E[0;7m
                                    p4                blink        \E[0;5m
                                    p5                dim          not available
                                    p6                bold         \E[0;1m
                                    p7                invis        \E[0;8m
                                    p8                protect      not used
                                    p9                altcharset   ^O (off) ^N (on)

       We begin each escape sequence by turning off any existing modes, since there is no quick way to determine
       whether they are active.  Standout is set up to be the  combination  of  reverse  and  bold.   The  vt220
       terminal  has a protect mode, though it is not commonly used in sgr because it protects characters on the
       screen from the host's erasures.  The altcharset mode also is different in that it is either  ^O  or  ^N,
       depending  on  whether  it  is  off  or  on.   If  all  modes  are  turned  on, the resulting sequence is
       \E[0;1;4;5;7;8m^N.

       Some sequences are common to different modes.  For example, ;7 is output when either p1 or  p3  is  true,
       that is, if either standout or reverse modes are turned on.

       Writing out the above sequences, along with their dependencies yields

                                  Sequence   When to Output      terminfo Translation
                                  ────────────────────────────────────────────────────
                                  \E[0       always              \E[0
                                  ;1         if p1 or p6         %?%p1%p6%|%t;1%;
                                  ;4         if p2               %?%p2%|%t;4%;
                                  ;5         if p4               %?%p4%|%t;5%;
                                  ;7         if p1 or p3         %?%p1%p3%|%t;7%;
                                  ;8         if p7               %?%p7%|%t;8%;
                                  m          always              m
                                  ^N or ^O   if p9 ^N, else ^O   %?%p9%t^N%e^O%;

       Putting this all together into the sgr sequence gives:

           sgr=\E[0%?%p1%p6%|%t;1%;%?%p2%t;4%;%?%p4%t;5%;
               %?%p1%p3%|%t;7%;%?%p7%t;8%;m%?%p9%t\016%e\017%;,

       Remember  that  if  you  specify sgr, you must also specify sgr0.  Also, some implementations rely on sgr
       being given if sgr0 is, Not all terminfo entries necessarily have an sgr string, however.  Many  terminfo
       entries  are  derived  from termcap entries which have no sgr string.  The only drawback to adding an sgr
       string is that termcap also assumes that sgr0 does not exit alternate character set mode.

       Terminals with the “magic cookie” glitch (xmc) deposit special “cookies” when they  receive  mode-setting
       sequences,  which  affect  the  display algorithm rather than having extra bits for each character.  Some
       terminals, such as the HP 2621, automatically leave standout mode when they move to a  new  line  or  the
       cursor  is addressed.  Programs using standout mode should exit standout mode before moving the cursor or
       sending a newline, unless the msgr capability, asserting that it is safe to move  in  standout  mode,  is
       present.

       If  the  terminal has a way of flashing the screen to indicate an error quietly (a bell replacement) then
       this can be given as flash; it must not move the cursor.

       If the cursor needs to be made more visible than normal when it is not on the bottom line (to  make,  for
       example,  a non-blinking underline into an easier to find block or blinking underline) give this sequence
       as cvvis.  If there is a way to make the cursor completely invisible, give that as civis.  The capability
       cnorm should be given which undoes the effects of both of these modes.

       If  your terminal correctly generates underlined characters (with no special codes needed) even though it
       does not overstrike, then you should give the capability ul.  If a character overstriking another  leaves
       both characters on the screen, specify the capability os.  If overstrikes are erasable with a blank, then
       this should be indicated by giving eo.

   Keypad and Function Keys
       If the terminal has a keypad that transmits codes when the keys are  pressed,  this  information  can  be
       given.   Note  that  it  is  not  possible to handle terminals where the keypad only works in local (this
       applies, for example, to the unshifted HP 2621 keys).  If the keypad  can  be  set  to  transmit  or  not
       transmit, give these codes as smkx and rmkx.  Otherwise the keypad is assumed to always transmit.

       The codes sent by the left arrow, right arrow, up arrow, down arrow, and home keys can be given as kcub1,
       kcuf1, kcuu1, kcud1, and khome respectively.  If there are function keys such as f0, f1,  ...,  f10,  the
       codes they send can be given as kf0, kf1, ..., kf10.  If these keys have labels other than the default f0
       through f10, the labels can be given as lf0, lf1, ..., lf10.

       The codes transmitted by certain other special keys can be given:

       •   kll (home down),

       •   kbs (backspace),

       •   ktbc (clear all tabs),

       •   kctab (clear the tab stop in this column),

       •   kclr (clear screen or erase key),

       •   kdch1 (delete character),

       •   kdl1 (delete line),

       •   krmir (exit insert mode),

       •   kel (clear to end of line),

       •   ked (clear to end of screen),

       •   kich1 (insert character or enter insert mode),

       •   kil1 (insert line),

       •   knp (next page),

       •   kpp (previous page),

       •   kind (scroll forward/down),

       •   kri (scroll backward/up),

       •   khts (set a tab stop in this column).

       In addition, if the keypad has a 3 by 3 array of keys including the four arrow keys, the other five  keys
       can  be  given  as  ka1,  ka3,  kb2,  kc1,  and  kc3.  These keys are useful when the effects of a 3 by 3
       directional pad are needed.

       Strings to program function keys can be given as pfkey, pfloc, and  pfx.   A  string  to  program  screen
       labels  should  be specified as pln.  Each of these strings takes two parameters: the function key number
       to program (from 0 to 10) and the string to program it with.  Function key numbers out of this range  may
       program  undefined  keys in a terminal dependent manner.  The difference between the capabilities is that
       pfkey causes pressing the given key to be the same as the user typing the given string; pfloc causes  the
       string  to  be  executed  by  the  terminal  in local; and pfx causes the string to be transmitted to the
       computer.

       The capabilities nlab, lw and lh define the number of programmable screen  labels  and  their  width  and
       height.   If  there  are  commands  to  turn  the labels on and off, give them in smln and rmln.  smln is
       normally output after one or more pln sequences to make sure that the change becomes visible.

   Tabs and Initialization
       A few capabilities are used only for tabs:

       •   If the terminal has hardware tabs, the command to advance to the next tab stop can  be  given  as  ht
           (usually control/I).

       •   A “back-tab” command which moves leftward to the preceding tab stop can be given as cbt.

           By  convention,  if  the  teletype modes indicate that tabs are being expanded by the computer rather
           than being sent to the terminal, programs should not use ht or cbt even if they  are  present,  since
           the user may not have the tab stops properly set.

       •   If the terminal has hardware tabs which are initially set every n spaces when the terminal is powered
           up, the numeric parameter it is given, showing the number of spaces the tabs are set to.

           The it capability is normally used by the tset command to determine  whether  to  set  the  mode  for
           hardware  tab expansion, and whether to set the tab stops.  If the terminal has tab stops that can be
           saved in non-volatile memory, the terminfo description can assume that they are properly set.

       Other capabilities include

       •   is1, is2, and is3, initialization strings for the terminal,

       •   iprog, the path name of a program to be run to initialize the terminal,

       •   and if, the name of a file containing long initialization strings.

       These strings are expected to set the terminal into modes  consistent  with  the  rest  of  the  terminfo
       description.   They  are normally sent to the terminal, by the init option of the tput program, each time
       the user logs in.  They will be printed in the following order:

              run the program
                     iprog

              output
                     is1 and
                     is2

              set the margins using
                     mgc or
                     smglp and smgrp or
                     smgl and smgr

              set tabs using
                     tbc and hts

              print the file
                     if

              and finally output
                     is3.

       Most initialization is done with is2.  Special terminal modes can be set up without  duplicating  strings
       by putting the common sequences in is2 and special cases in is1 and is3.

       A set of sequences that does a harder reset from a totally unknown state can be given as rs1, rs2, rf and
       rs3, analogous to is1 , is2 , if and is3 respectively.  These strings are output by reset option of tput,
       or  by  the  reset  program (an alias of tset), which is used when the terminal gets into a wedged state.
       Commands are normally placed in rs1, rs2 rs3 and rf only if they produce annoying effects on  the  screen
       and  are  not  necessary  when logging in.  For example, the command to set the vt100 into 80-column mode
       would normally be part of is2, but it causes an annoying glitch of the screen and is not normally  needed
       since the terminal is usually already in 80-column mode.

       The reset program writes strings including iprog, etc., in the same order as the init program, using rs1,
       etc., instead of is1, etc.  If any of rs1, rs2, rs3, or rf reset  capability  strings  are  missing,  the
       reset program falls back upon the corresponding initialization capability string.

       If  there are commands to set and clear tab stops, they can be given as tbc (clear all tab stops) and hts
       (set a tab stop in the current column of every row).  If a more complex sequence is  needed  to  set  the
       tabs than can be described by this, the sequence can be placed in is2 or if.

       The  tput  reset command uses the same capability strings as the reset command, although the two programs
       (tput and reset) provide different command-line options.

       In practice, these terminfo capabilities are not often used in initialization of tabs  (though  they  are
       required for the tabs program):

       •   Almost  all hardware terminals (at least those which supported tabs) initialized those to every eight
           columns:

           The only exception was the AT&T 2300 series, which set tabs to every five columns.

       •   In particular, developers of the hardware terminals which are commonly  used  as  models  for  modern
           terminal emulators provided documentation demonstrating that eight columns were the standard.

       •   Because  of this, the terminal initialization programs tput and tset use the tbc (clear_all_tabs) and
           hts (set_tab) capabilities directly only when the it (init_tabs) capability is set to a  value  other
           than eight.

   Delays and Padding
       Many  older  and  slower terminals do not support either XON/XOFF or DTR handshaking, including hard copy
       terminals and some very archaic CRTs (including, for example, DEC VT100s).   These  may  require  padding
       characters after certain cursor motions and screen changes.

       If  the  terminal  uses xon/xoff handshaking for flow control (that is, it automatically emits ^S back to
       the host when its input buffers are close to full), set xon.  This capability suppresses the emission  of
       padding.   You  can  also  set  it for memory-mapped console devices effectively that do not have a speed
       limit.  Padding information should still be included so that routines can  make  better  decisions  about
       relative costs, but actual pad characters will not be transmitted.

       If  pb  (padding  baud rate) is given, padding is suppressed at baud rates below the value of pb.  If the
       entry has no padding baud rate, then whether padding is emitted or not is completely controlled by xon.

       If the terminal requires other than a null (zero) character as a pad, then this  can  be  given  as  pad.
       Only the first character of the pad string is used.

   Status Lines
       Some  terminals  have an extra “status line” which is not normally used by software (and thus not counted
       in the terminal's lines capability).

       The simplest case is a status line which is cursor-addressable but not part of the main scrolling  region
       on  the  screen; the Heathkit H19 has a status line of this kind, as would a 24-line VT100 with a 23-line
       scrolling region set up on initialization.  This situation is indicated by the hs capability.

       Some terminals with status lines need special  sequences  to  access  the  status  line.   These  may  be
       expressed  as  a string with single parameter tsl which takes the cursor to a given zero-origin column on
       the status line.  The capability fsl must return to the main-screen cursor positions before the last tsl.
       You  may  need  to  embed the string values of sc (save cursor) and rc (restore cursor) in tsl and fsl to
       accomplish this.

       The status line is normally assumed to be the same width as the  width  of  the  terminal.   If  this  is
       untrue, you can specify it with the numeric capability wsl.

       A command to erase or blank the status line may be specified as dsl.

       The  Boolean  capability eslok specifies that escape sequences, tabs, etc., work ordinarily in the status
       line.

       The ncurses implementation does not yet use any of these capabilities.  They are documented here in  case
       they ever become important.

   Line Graphics
       Many terminals have alternate character sets useful for forms-drawing.  Terminfo and curses have built-in
       support for most of the drawing characters supported by the VT100, with some  characters  from  the  AT&T
       4410v1 added.  This alternate character set may be specified by the acsc capability.

                          acsc
       ACS Name      Value   Symbol   ASCII Fallback / Glyph Name
       ──────────────────────────────────────────────────────────────────────────────────────────────────────────
       ACS_RARROW    0x2b      +      >  arrow pointing right
       ACS_LARROW    0x2c      ,      <  arrow pointing left
       ACS_UARROW    0x2d      -      ^  arrow pointing up
       ACS_DARROW    0x2e      .      v  arrow pointing down
       ACS_BLOCK     0x30      0      #  solid square block
       ACS_DIAMOND   0x60      `      +  diamond
       ACS_CKBOARD   0x61      a      :  checker board (stipple)
       ACS_DEGREE    0x66      f      \  degree symbol
       ACS_PLMINUS   0x67      g      #  plus/minus
       ACS_BOARD     0x68      h      #  board of squares
       ACS_LANTERN   0x69      i      #  lantern symbol
       ACS_LRCORNER  0x6a      j      +  lower right corner
       ACS_URCORNER  0x6b      k      +  upper right corner
       ACS_ULCORNER  0x6c      l      +  upper left corner
       ACS_LLCORNER  0x6d      m      +  lower left corner
       ACS_PLUS      0x6e      n      +  large plus or crossover
       ACS_S1        0x6f      o      ~  scan line 1
       ACS_S3        0x70      p      -  scan line 3
       ACS_HLINE     0x71      q      -  horizontal line
       ACS_S7        0x72      r      -  scan line 7
       ACS_S9        0x73      s      _  scan line 9
       ACS_LTEE      0x74      t      +  tee pointing right
       ACS_RTEE      0x75      u      +  tee pointing left
       ACS_BTEE      0x76      v      +  tee pointing up
       ACS_TTEE      0x77      w      +  tee pointing down
       ACS_VLINE     0x78      x      |  vertical line
       ACS_LEQUAL    0x79      y      <  less-than-or-equal-to
       ACS_GEQUAL    0x7a      z      >  greater-than-or-equal-to
       ACS_PI        0x7b      {      *  greek pi
       ACS_NEQUAL    0x7c      |      !  not-equal
       ACS_STERLING  0x7d      }      f  UK pound sign
       ACS_BULLET    0x7e      ~      o  bullet

       A few notes apply to the table itself:

       •   X/Open  Curses  incorrectly  states  that  the  mapping  for  lantern  is uppercase “I” although Unix
           implementations use the lowercase “i” mapping.

       •   The DEC VT100 implemented graphics using the alternate character set feature,  temporarily  switching
           modes  and  sending  characters  in  the  range 0x60 (96) to 0x7e (126) (the acsc Value column in the
           table).

       •   The AT&T terminal added graphics characters outside that range.

           Some of the characters within the range do not match the VT100; presumably they were used in the AT&T
           terminal: board of squares replaces the VT100 newline symbol, while lantern symbol replaces the VT100
           vertical tab symbol.  The other VT100 symbols for control characters (horizontal tab, carriage return
           and line-feed) are not (re)used in curses.

       The  best  way  to define a new device's graphics set is to add a column to a copy of this table for your
       terminal, giving the character which (when emitted between smacs/rmacs switches) will be rendered as  the
       corresponding  graphic.  Then read off the VT100/your terminal character pairs right to left in sequence;
       these become the ACSC string.

   Color Handling
       The curses library functions init_pair and  init_color  manipulate  the  color  pairs  and  color  values
       discussed in this section (see color(3NCURSES) for details on these and related functions).

       Most color terminals are either “Tektronix-like” or “HP-like”:

       •   Tektronix-like  terminals  have  a  predefined  set  of  N colors (where N is usually 8), and can set
           character-cell foreground and background characters  independently,  mixing  them  into  N * N  color
           pairs.

       •   On  HP-like terminals, the user must set each color pair up separately (foreground and background are
           not independently settable).  Up to M color pairs may be set up from  2*M  different  colors.   ANSI-
           compatible terminals are Tektronix-like.

       Some  basic  color capabilities are independent of the color method.  The numeric capabilities colors and
       pairs specify the maximum numbers of colors and color pairs that can be displayed simultaneously.  The op
       (original  pair) string resets foreground and background colors to their default values for the terminal.
       The oc string resets all colors or color pairs to their default values for the terminal.  Some  terminals
       (including  many  PC terminal emulators) erase screen areas with the current background color rather than
       the power-up default background; these should have the Boolean capability bce.

       While the curses library works with color  pairs  (reflecting  the  inability  of  some  devices  to  set
       foreground  and  background  colors  independently),  there  are  separate capabilities for setting these
       features:

       •   To change the current foreground or background color on a Tektronix-type  terminal,  use  setaf  (set
           ANSI  foreground) and setab (set ANSI background) or setf (set foreground) and setb (set background).
           These take one parameter, the color number.  The SVr4 documentation describes only  setaf/setab;  the
           XPG4  draft  says  that  "If  the  terminal  supports  ANSI  escape  sequences  to set background and
           foreground, they should be coded as setaf and setab, respectively.

       •   If the terminal supports other escape sequences to set background  and  foreground,  they  should  be
           coded  as setf and setb, respectively.  The vidputs and the refresh(3NCURSES) functions use the setaf
           and setab capabilities if they are defined.

       The setaf/setab and setf/setb capabilities take a single numeric argument each.  Argument values  0-7  of
       setaf/setab  are  portably defined as follows (the middle column is the symbolic #define available in the
       header for the curses or ncurses libraries).  The terminal hardware is free to map these as it likes, but
       the RGB values indicate normal locations in color space.

                                     Color      #define       Value        RGB
                                    ────────────────────────────────────────────────
                                    black     COLOR_BLACK       0     0,   0,   0
                                    red       COLOR_RED         1     max, 0,   0
                                    green     COLOR_GREEN       2     0,   max, 0
                                    yellow    COLOR_YELLOW      3     max, max, 0
                                    blue      COLOR_BLUE        4     0,   0,   max
                                    magenta   COLOR_MAGENTA     5     max, 0,   max
                                    cyan      COLOR_CYAN        6     0,   max, max
                                    white     COLOR_WHITE       7     max, max, max

       The argument values of setf/setb historically correspond to a different mapping, i.e.,

                                     Color      #define       Value        RGB
                                    ────────────────────────────────────────────────
                                    black     COLOR_BLACK       0     0,   0,   0
                                    blue      COLOR_BLUE        1     0,   0,   max
                                    green     COLOR_GREEN       2     0,   max, 0
                                    cyan      COLOR_CYAN        3     0,   max, max
                                    red       COLOR_RED         4     max, 0,   0
                                    magenta   COLOR_MAGENTA     5     max, 0,   max
                                    yellow    COLOR_YELLOW      6     max, max, 0
                                    white     COLOR_WHITE       7     max, max, max

       It  is  important  to  not  confuse  the  two  sets  of  color  capabilities;  otherwise red/blue will be
       interchanged on the display.

       On an HP-like terminal, use scp with a color pair number parameter to set which color pair is current.

       Some terminals allow the color values to be modified:

       •   On a Tektronix-like terminal, the capability ccc may be  present  to  indicate  that  colors  can  be
           modified.   If  so,  the  initc  capability  will take a color number (0 to colors - 1)and three more
           parameters which describe the color.  These three parameters default  to  being  interpreted  as  RGB
           (Red,  Green,  Blue) values.  If the Boolean capability hls is present, they are instead as HLS (Hue,
           Lightness, Saturation) indices.  The ranges are terminal-dependent.

       •   On an HP-like terminal, initp may give a capability for changing a color pair value.   It  will  take
           seven  parameters;  a  color  pair  number  (0  to  max_pairs  - 1), and two triples describing first
           background and then foreground colors.   These  parameters  must  be  (Red,  Green,  Blue)  or  (Hue,
           Lightness, Saturation) depending on hls.

       On  some color terminals, colors collide with highlights.  You can register these collisions with the ncv
       capability.  This is a bit mask of attributes not to be used when colors are enabled.  The correspondence
       with the attributes understood by curses is as follows:

                                          Attribute     Bit   Decimal   Set by
                                         ──────────────────────────────────────
                                         A_STANDOUT      0         1    sgr
                                         A_UNDERLINE     1         2    sgr
                                         A_REVERSE       2         4    sgr
                                         A_BLINK         3         8    sgr
                                         A_DIM           4        16    sgr
                                         A_BOLD          5        32    sgr
                                         A_INVIS         6        64    sgr
                                         A_PROTECT       7       128    sgr
                                         A_ALTCHARSET    8       256    sgr
                                         A_HORIZONTAL    9       512    sgr1
                                         A_LEFT         10      1024    sgr1
                                         A_LOW          11      2048    sgr1
                                         A_RIGHT        12      4096    sgr1
                                         A_TOP          13      8192    sgr1
                                         A_VERTICAL     14     16384    sgr1
                                         A_ITALIC       15     32768    sitm

       For example, on many IBM PC consoles, the underline attribute collides with the foreground color blue and
       is not available in color mode.  These should have an ncv capability of 2.

       SVr4 curses does nothing with ncv, ncurses recognizes it and optimizes the output in favor of colors.

   Miscellaneous
       If the terminal requires other than a null (zero) character as a pad, then this  can  be  given  as  pad.
       Only  the  first  character  of  the  pad string is used.  If the terminal does not have a pad character,
       specify npc.  Note that ncurses implements the termcap-compatible PC variable; though the application may
       set  this value to something other than a null, ncurses will test npc first and use napms if the terminal
       has no pad character.

       If the terminal can move up or down half a line, this can be indicated with  hu  (half-line  up)  and  hd
       (half-line down).  This is primarily useful for superscripts and subscripts on hard-copy terminals.  If a
       hard-copy terminal can eject to the next page (form feed), give this as ff (usually control/L).

       If there is a command to repeat a given character a given number of times (to save  time  transmitting  a
       large number of identical characters) this can be indicated with the parameterized string rep.  The first
       parameter is the character to be repeated and the second is the number of  times  to  repeat  it.   Thus,
       tparm(repeat_char, 'x', 10) is the same as “xxxxxxxxxx”.

       If  the terminal has a settable command character, such as the TEKTRONIX 4025, this can be indicated with
       cmdch.  A prototype command character is chosen which is used in all  capabilities.   This  character  is
       given  in  the  cmdch  capability  to  identify  it.   The following convention is supported on some Unix
       systems: The environment is to be searched for a CC variable,  and  if  found,  all  occurrences  of  the
       prototype character are replaced with the character in the environment variable.

       Terminal  descriptions  that  do not represent a specific kind of known terminal, such as switch, dialup,
       patch, and network, should include the gn (generic) capability so that programs can complain that they do
       not  know  how to talk to the terminal.  (This capability does not apply to virtual terminal descriptions
       for which the escape sequences are known.)

       If the terminal has a “meta key” which acts as a  shift  key,  setting  the  8th  bit  of  any  character
       transmitted,  this  fact  can  be indicated with km.  Otherwise, software will assume that the 8th bit is
       parity and it will usually be cleared.  If strings exist to turn this “meta mode” on and off, they can be
       given as smm and rmm.

       If  the  terminal  has  more  lines of memory than will fit on the screen at once, the number of lines of
       memory can be indicated with lm.  A value of lm#0 indicates that the number of lines is  not  fixed,  but
       that there is still more memory than fits on the screen.

       If  the terminal is one of those supported by the Unix virtual terminal protocol, the terminal number can
       be given as vt.

       Media copy strings which control an auxiliary printer connected to the terminal  can  be  given  as  mc0:
       print  the  contents  of  the  screen, mc4: turn off the printer, and mc5: turn on the printer.  When the
       printer is on, all text sent to the terminal will be sent to the printer.  It is  undefined  whether  the
       text  is  also  displayed  on  the  terminal  screen  when the printer is on.  A variation mc5p takes one
       parameter, and leaves the printer on for as many characters as the value of the parameter, then turns the
       printer  off.   The parameter should not exceed 255.  All text, including mc4, is transparently passed to
       the printer while an mc5p is in effect.

   Glitches and Brain Damage
       Hazeltine terminals, which do not allow “~” characters to be displayed should indicate hz.

       Terminals which ignore a line-feed immediately after an am wrap, such as the Concept  and  vt100,  should
       indicate xenl.

       If el is required to get rid of standout (instead of merely writing normal text on top of it), xhp should
       be given.

       Teleray terminals, where tabs turn all characters moved over to blanks, should indicate  xt  (destructive
       tabs).   Note:  the  variable  indicating  this  is now “dest_tabs_magic_smso”; in older versions, it was
       teleray_glitch.  This glitch is also taken to mean that it is not possible to position the cursor on  top
       of  a  “magic cookie”, that to erase standout mode it is instead necessary to use delete and insert line.
       The ncurses implementation ignores this glitch.

       The Beehive Superbee, which is unable to correctly transmit the escape or control/C characters, has  xsb,
       indicating  that  the  f1 key is used for escape and f2 for control/C.  (Only certain Superbees have this
       problem, depending on the ROM.)  Note that  in  older  terminfo  versions,  this  capability  was  called
       “beehive_glitch”; it is now “no_esc_ctl_c”.

       Other specific terminal problems may be corrected by adding more capabilities of the form xx.

   Pitfalls of Long Entries
       Long  terminfo  entries  are  unlikely  to be a problem; to date, no entry has even approached terminfo's
       4096-byte string-table maximum.  Unfortunately, the termcap translations are much more  strictly  limited
       (to 1023 bytes), thus termcap translations of long terminfo entries can cause problems.

       The  man  pages for 4.3BSD and older versions of tgetent instruct the user to allocate a 1024-byte buffer
       for the termcap entry.  The entry gets null-terminated by the termcap library, so that makes the  maximum
       safe  length  for  a  termcap entry 1k-1 (1023) bytes.  Depending on what the application and the termcap
       library being used does, and where in the termcap file the terminal type that tgetent  is  searching  for
       is, several bad things can happen:

       •   some termcap libraries print a warning message,

       •   some exit if they find an entry that's longer than 1023 bytes,

       •   some neither exit nor warn, doing nothing useful, and

       •   some simply truncate the entries to 1023 bytes.

       Some application programs allocate more than the recommended 1K for the termcap entry; others do not.

       Each  termcap  entry  has  two  important sizes associated with it: before “tc” expansion, and after “tc”
       expansion.  “tc” is the capability that tacks on another termcap entry to the end of the current one,  to
       add  on  its  capabilities.   If a termcap entry does not use the “tc” capability, then of course the two
       lengths are the same.

       The “before tc expansion” length is the most important one, because it affects more than  just  users  of
       that  particular  terminal.   This  is  the  length  of the entry as it exists in /etc/termcap, minus the
       backslash-newline pairs, which tgetent strips out while reading it.  Some termcap libraries strip off the
       final newline, too (GNU termcap does not).  Now suppose:

       •   a termcap entry before expansion is more than 1023 bytes long,

       •   and the application has only allocated a 1k buffer,

       •   and  the  termcap library (like the one in BSD/OS 1.1 and GNU) reads the whole entry into the buffer,
           no matter what its length, to see if it is the entry it wants,

       •   and tgetent is searching for a terminal type that either is the long entry, appears  in  the  termcap
           file  after  the long entry, or does not appear in the file at all (so that tgetent has to search the
           whole termcap file).

       Then tgetent will overwrite memory, perhaps its stack, and probably core dump the program.  Programs like
       telnet   are   particularly  vulnerable;  modern  telnets  pass  along  values  like  the  terminal  type
       automatically.  The results are almost as undesirable with a termcap library, like SunOS 4.1.3 and Ultrix
       4.4,  that  prints  warning  messages  when  it reads an overly long termcap entry.  If a termcap library
       truncates long entries, like OSF/1 3.0, it is immune to dying here but will return incorrect data for the
       terminal.

       The “after tc expansion” length will have a similar effect to the above, but only for people who actually
       set TERM to that terminal type, since tgetent only does “tc” expansion once it is found the terminal type
       it was looking for, not while searching.

       In  summary, a termcap entry that is longer than 1023 bytes can cause, on various combinations of termcap
       libraries and applications, a core dump, warnings, or incorrect operation.  If it is too long even before
       “tc” expansion, it will have this effect even for users of some other terminal types and users whose TERM
       variable does not have a termcap entry.

       When in -C (translate to termcap) mode, the ncurses implementation of tic(1) issues warning messages when
       the  pre-tc  length  of  a  termcap  translation is too long.  The -c (check) option also checks resolved
       (after tc expansion) lengths.

FILES

       /etc/terminfo
              compiled terminal description database directory

EXTENSIONS

       Searching for terminal descriptions in $HOME/.terminfo  and  TERMINFO_DIRS  is  not  supported  by  older
       implementations.

       Some  SVr4  curses implementations, and all previous to SVr4, do not interpret the %A and %O operators in
       parameter strings.

       SVr4/XPG4 do not specify whether msgr licenses movement while in an  alternate-character-set  mode  (such
       modes  may,  among  other  things,  map  CR and NL to characters that do not trigger local motions).  The
       ncurses implementation ignores msgr in ALTCHARSET  mode.   This  raises  the  possibility  that  an  XPG4
       implementation making the opposite interpretation may need terminfo entries made for ncurses to have msgr
       turned off.

       The ncurses library handles insert-character and insert-character modes in a slightly non-standard way to
       get better update efficiency.  See the Insert/Delete Character subsection above.

       The  parameter substitutions for set_clock and display_clock are not documented in SVr4 or X/Open Curses.
       They are deduced from the documentation for the AT&T 505 terminal.

       Be careful assigning the kmous capability.  The ncurses library wants to interpret it as  KEY_MOUSE,  for
       use  by  terminals  and  emulators like xterm that can return mouse-tracking information in the keyboard-
       input stream.

       X/Open Curses does not mention italics.  Portable applications must assume that numeric capabilities  are
       signed  16-bit values.  This includes the no_color_video (ncv) capability.  The 32768 mask value used for
       italics with ncv can be confused with an absent or cancelled ncv.  If italics should  work  with  colors,
       then the ncv value must be specified, even if it is zero.

       Different commercial ports of terminfo and curses support different subsets of X/Open Curses and (in some
       cases) different extensions.  Here is a summary, accurate as of October 1995, after which the  commercial
       Unix market contracted and lost diversity.

       •   SVr4, Solaris, and ncurses support all SVr4 capabilities.

       •   IRIX supports the SVr4 set and adds one undocumented extended string capability (set_pglen).

       •   SVr1  and  Ultrix  support  a  restricted  subset  of  terminfo  capabilities.  The Booleans end with
           xon_xoff; the numerics with width_status_line; and the strings with prtr_non.

       •   HP/UX supports the SVr1 subset, plus the SVr[234]  numerics  num_labels,  label_height,  label_width,
           plus  function  keys  11  through  63,  plus  plab_norm,  label_on,  and  label_off, plus a number of
           incompatible string table extensions.

       •   AIX supports the SVr1 subset, plus function keys 11 through 63, plus a number of incompatible  string
           table extensions.

       •   OSF/1 supports both the SVr4 set and the AIX extensions.

PORTABILITY

       Do  not  count  on compiled (binary) terminfo entries being portable between commercial Unix systems.  At
       least two implementations of terminfo (those of HP-UX and AIX) diverged from  those  of  other  System  V
       Unices  after SVr1, adding extension capabilities to the string table that (in the binary format) collide
       with subsequent System V and X/Open Curses extensions.

AUTHORS

       Zeyd M. Ben-Halim, Eric S. Raymond, Thomas E. Dickey.  Based on pcurses by Pavel Curtis.

SEE ALSO

       infocmp(1),     tabs(1),     tic(1),     ncurses(3NCURSES),     color(3NCURSES),      terminfo(3NCURSES),
       curses_variables(3NCURSES), printf(3), terminfo_variables(3NCURSES), term(5), user_caps(5)