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32 .Nd xterm-like terminal emulation interface
38 .Fn teken_init "teken_t *t" "const teken_funcs_t *funcs" "void *thunk"
40 .Fn teken_input "teken_t *t" "const void *buf" "size_t nbytes"
41 .Ft const teken_pos_t *
42 .Fn teken_get_winsize "teken_t *t"
44 .Fn teken_set_winsize "teken_t *t" "const teken_pos_t *size"
45 .Ft const teken_pos_t *
46 .Fn teken_get_cursor "const teken_t *t"
48 .Fn teken_set_cursor "teken_t *t" "const teken_pos_t *pos"
49 .Ft const teken_attr_t *
50 .Fn teken_get_curattr "const teken_t *t"
52 .Fn teken_set_curattr "teken_t *t" "const teken_attr_t *attr"
53 .Ft const teken_attr_t *
54 .Fn teken_get_defattr "const teken_t *t"
56 .Fn teken_set_defattr "teken_t *t" "const teken_attr_t *attr"
58 .Fn teken_get_sequence "const teken_t *t" "unsigned int id"
60 .Fn teken_256to16 "teken_color_t color"
62 .Fn teken_256to8 "teken_color_t color"
64 .Fn teken_get_defattr_cons25 "const teken_t *t" "int *fg" "int *bg"
66 .Fn teken_set_8bit "teken_t *t"
68 .Fn teken_set_cons25 "teken_t *t"
72 library implements the input parser of a 256-color xterm-like terminal.
73 It converts a stream of UTF-8 encoded characters into a series of
74 primitive drawing instructions that can be used by a console driver or
75 terminal emulator to render a terminal application.
79 function is used to initialize terminal state object
87 contains a set of callback functions, which are called when supplying
92 argument stores an arbitrary pointer, which is passed to each invocation
93 of the callback functions.
97 structure stores the following callbacks:
98 .Bd -literal -offset indent
100 tf_bell_t *tf_bell; /* Audible/visible bell. */
101 tf_cursor_t *tf_cursor; /* Move cursor to x/y. */
102 tf_putchar_t *tf_putchar; /* Put Unicode character at x/y. */
103 tf_fill_t *tf_fill; /* Fill rectangle with character. */
104 tf_copy_t *tf_copy; /* Copy rectangle to new location. */
105 tf_param_t *tf_param; /* Miscellaneous options. */
106 tf_respond_t *tf_respond; /* Send response string to user. */
110 All callbacks must be provided, though unimplemented callbacks may some
112 The actual types of these callbacks can be found in
119 structure to emulate a terminal having 24 rows and 80 columns.
121 .Fn teken_get_winsize
123 .Fn teken_set_winsize
124 functions can be used to obtain and modify the dimensions of the
127 Even though the cursor position is normally controlled by input of data
132 callback, it can be obtained and modified manually using the
138 .Fn teken_get_curattr
140 .Fn teken_set_curattr ,
141 which can be used to change the currently selected font attributes and
142 foreground and background color.
146 emulates a white-on-black terminal, which means the default foreground
147 color is white, while the background color is black.
148 These defaults can be modified using
149 .Fn teken_get_defattr
151 .Fn teken_set_defattr .
154 .Fn teken_get_sequence
155 function is a utility function that can be used to obtain escape
156 sequences of special keyboard keys, generated by user input.
159 parameter must be one of the
164 This library also provides a set of functions that shouldn't be used in
165 any modern applications.
169 function converts an xterm-256 256-color code to an xterm 16-color code
170 whose color with default palettes is as similar as possible (not very
172 The lower 3 bits of the result are the ANSI color and the next lowest
174 Other layers (hardare and software) that only support 16 colors can use
175 this to avoid knowing the details of 256-color codes.
179 function is similar to
181 except it converts to an ANSI 8-color code.
182 This is more accurate than discarding the brigtness bit in the result of
186 .Fn teken_get_defattr_cons25
187 function obtains the default terminal attributes as a pair of foreground
188 and background colors, using ANSI color numbering.
192 function disables UTF-8 processing and switches to 8-bit character mode,
193 which can be used to support character sets like CP437 and ISO-8859-1.
197 function switches terminal emulation to
199 which is used by versions of
211 though it was only available and used inside the kernel.
216 library appeared in userspace.
218 .An Ed Schouten Aq ed@FreeBSD.org
219 .Sh SECURITY CONSIDERATIONS
222 callback is used to respond to device status requests commands generated
224 In the past, there have been various security issues, where a malicious
225 application sends a device status request before termination, causing
226 the generated response to be interpreted by applications such as
230 only implements a small subset of responses which are unlikely to cause
232 Still, it is advised to leave