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freebsd-skq/sys/teken/teken.c
Ed Schouten cd69db4b0e Pick UINT_MAX / 100 as an upperbound. 
The fix that I applied in r286798 is already good, but it assumes that
sizeof(int) > sizeof(short). Express the upperbound in terms of
UINT_MAX. By dividing that by 100, we're sure that the resulting value
is never larger than approximately UINT_MAX / 10, which is safe.

PR:		202326
Discussed with:	kcwu csie org
MFC after:	1 month
2015-08-16 13:59:11 +00:00

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/*-
* Copyright (c) 2008-2009 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#if defined(__FreeBSD__) && defined(_KERNEL)
#include <sys/param.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/systm.h>
#define teken_assert(x) MPASS(x)
#else /* !(__FreeBSD__ && _KERNEL) */
#include <sys/types.h>
#include <assert.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#define teken_assert(x) assert(x)
#endif /* __FreeBSD__ && _KERNEL */
/* debug messages */
#define teken_printf(x,...)
/* Private flags for t_stateflags. */
#define TS_FIRSTDIGIT 0x0001 /* First numeric digit in escape sequence. */
#define TS_INSERT 0x0002 /* Insert mode. */
#define TS_AUTOWRAP 0x0004 /* Autowrap. */
#define TS_ORIGIN 0x0008 /* Origin mode. */
#define TS_WRAPPED 0x0010 /* Next character should be printed on col 0. */
#define TS_8BIT 0x0020 /* UTF-8 disabled. */
#define TS_CONS25 0x0040 /* cons25 emulation. */
#define TS_INSTRING 0x0080 /* Inside string. */
#define TS_CURSORKEYS 0x0100 /* Cursor keys mode. */
/* Character that blanks a cell. */
#define BLANK ' '
#include "teken.h"
#include "teken_wcwidth.h"
#include "teken_scs.h"
static teken_state_t teken_state_init;
/*
* Wrappers for hooks.
*/
static inline void
teken_funcs_bell(teken_t *t)
{
t->t_funcs->tf_bell(t->t_softc);
}
static inline void
teken_funcs_cursor(teken_t *t)
{
teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
t->t_funcs->tf_cursor(t->t_softc, &t->t_cursor);
}
static inline void
teken_funcs_putchar(teken_t *t, const teken_pos_t *p, teken_char_t c,
const teken_attr_t *a)
{
teken_assert(p->tp_row < t->t_winsize.tp_row);
teken_assert(p->tp_col < t->t_winsize.tp_col);
t->t_funcs->tf_putchar(t->t_softc, p, c, a);
}
static inline void
teken_funcs_fill(teken_t *t, const teken_rect_t *r,
const teken_char_t c, const teken_attr_t *a)
{
teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
t->t_funcs->tf_fill(t->t_softc, r, c, a);
}
static inline void
teken_funcs_copy(teken_t *t, const teken_rect_t *r, const teken_pos_t *p)
{
teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
teken_assert(p->tp_row + (r->tr_end.tp_row - r->tr_begin.tp_row) <= t->t_winsize.tp_row);
teken_assert(p->tp_col + (r->tr_end.tp_col - r->tr_begin.tp_col) <= t->t_winsize.tp_col);
t->t_funcs->tf_copy(t->t_softc, r, p);
}
static inline void
teken_funcs_param(teken_t *t, int cmd, unsigned int value)
{
t->t_funcs->tf_param(t->t_softc, cmd, value);
}
static inline void
teken_funcs_respond(teken_t *t, const void *buf, size_t len)
{
t->t_funcs->tf_respond(t->t_softc, buf, len);
}
#include "teken_subr.h"
#include "teken_subr_compat.h"
/*
* Programming interface.
*/
void
teken_init(teken_t *t, const teken_funcs_t *tf, void *softc)
{
teken_pos_t tp = { .tp_row = 24, .tp_col = 80 };
t->t_funcs = tf;
t->t_softc = softc;
t->t_nextstate = teken_state_init;
t->t_stateflags = 0;
t->t_utf8_left = 0;
t->t_defattr.ta_format = 0;
t->t_defattr.ta_fgcolor = TC_WHITE;
t->t_defattr.ta_bgcolor = TC_BLACK;
teken_subr_do_reset(t);
teken_set_winsize(t, &tp);
}
static void
teken_input_char(teken_t *t, teken_char_t c)
{
/*
* There is no support for DCS and OSC. Just discard strings
* until we receive characters that may indicate string
* termination.
*/
if (t->t_stateflags & TS_INSTRING) {
switch (c) {
case '\x1B':
t->t_stateflags &= ~TS_INSTRING;
break;
case '\a':
t->t_stateflags &= ~TS_INSTRING;
return;
default:
return;
}
}
switch (c) {
case '\0':
break;
case '\a':
teken_subr_bell(t);
break;
case '\b':
teken_subr_backspace(t);
break;
case '\n':
case '\x0B':
teken_subr_newline(t);
break;
case '\x0C':
teken_subr_newpage(t);
break;
case '\x0E':
if (t->t_stateflags & TS_CONS25)
t->t_nextstate(t, c);
else
t->t_curscs = 1;
break;
case '\x0F':
if (t->t_stateflags & TS_CONS25)
t->t_nextstate(t, c);
else
t->t_curscs = 0;
break;
case '\r':
teken_subr_carriage_return(t);
break;
case '\t':
teken_subr_horizontal_tab(t);
break;
default:
t->t_nextstate(t, c);
break;
}
/* Post-processing assertions. */
teken_assert(t->t_cursor.tp_row >= t->t_originreg.ts_begin);
teken_assert(t->t_cursor.tp_row < t->t_originreg.ts_end);
teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
teken_assert(t->t_saved_cursor.tp_row < t->t_winsize.tp_row);
teken_assert(t->t_saved_cursor.tp_col < t->t_winsize.tp_col);
teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
teken_assert(t->t_scrollreg.ts_begin < t->t_scrollreg.ts_end);
/* Origin region has to be window size or the same as scrollreg. */
teken_assert((t->t_originreg.ts_begin == t->t_scrollreg.ts_begin &&
t->t_originreg.ts_end == t->t_scrollreg.ts_end) ||
(t->t_originreg.ts_begin == 0 &&
t->t_originreg.ts_end == t->t_winsize.tp_row));
}
static void
teken_input_byte(teken_t *t, unsigned char c)
{
/*
* UTF-8 handling.
*/
if ((c & 0x80) == 0x00 || t->t_stateflags & TS_8BIT) {
/* One-byte sequence. */
t->t_utf8_left = 0;
teken_input_char(t, c);
} else if ((c & 0xe0) == 0xc0) {
/* Two-byte sequence. */
t->t_utf8_left = 1;
t->t_utf8_partial = c & 0x1f;
} else if ((c & 0xf0) == 0xe0) {
/* Three-byte sequence. */
t->t_utf8_left = 2;
t->t_utf8_partial = c & 0x0f;
} else if ((c & 0xf8) == 0xf0) {
/* Four-byte sequence. */
t->t_utf8_left = 3;
t->t_utf8_partial = c & 0x07;
} else if ((c & 0xc0) == 0x80) {
if (t->t_utf8_left == 0)
return;
t->t_utf8_left--;
t->t_utf8_partial = (t->t_utf8_partial << 6) | (c & 0x3f);
if (t->t_utf8_left == 0) {
teken_printf("Got UTF-8 char %x\n", t->t_utf8_partial);
teken_input_char(t, t->t_utf8_partial);
}
}
}
void
teken_input(teken_t *t, const void *buf, size_t len)
{
const char *c = buf;
while (len-- > 0)
teken_input_byte(t, *c++);
}
const teken_pos_t *
teken_get_cursor(teken_t *t)
{
return (&t->t_cursor);
}
void
teken_set_cursor(teken_t *t, const teken_pos_t *p)
{
/* XXX: bounds checking with originreg! */
teken_assert(p->tp_row < t->t_winsize.tp_row);
teken_assert(p->tp_col < t->t_winsize.tp_col);
t->t_cursor = *p;
}
const teken_attr_t *
teken_get_curattr(teken_t *t)
{
return (&t->t_curattr);
}
void
teken_set_curattr(teken_t *t, const teken_attr_t *a)
{
t->t_curattr = *a;
}
const teken_attr_t *
teken_get_defattr(teken_t *t)
{
return (&t->t_defattr);
}
void
teken_set_defattr(teken_t *t, const teken_attr_t *a)
{
t->t_curattr = t->t_saved_curattr = t->t_defattr = *a;
}
const teken_pos_t *
teken_get_winsize(teken_t *t)
{
return (&t->t_winsize);
}
static void
teken_trim_cursor_pos(teken_t *t, const teken_pos_t *new)
{
const teken_pos_t *cur;
cur = &t->t_winsize;
if (cur->tp_row < new->tp_row || cur->tp_col < new->tp_col)
return;
if (t->t_cursor.tp_row >= new->tp_row)
t->t_cursor.tp_row = new->tp_row - 1;
if (t->t_cursor.tp_col >= new->tp_col)
t->t_cursor.tp_col = new->tp_col - 1;
}
void
teken_set_winsize(teken_t *t, const teken_pos_t *p)
{
teken_trim_cursor_pos(t, p);
t->t_winsize = *p;
teken_subr_do_reset(t);
}
void
teken_set_winsize_noreset(teken_t *t, const teken_pos_t *p)
{
teken_trim_cursor_pos(t, p);
t->t_winsize = *p;
teken_subr_do_resize(t);
}
void
teken_set_8bit(teken_t *t)
{
t->t_stateflags |= TS_8BIT;
}
void
teken_set_cons25(teken_t *t)
{
t->t_stateflags |= TS_CONS25;
}
/*
* State machine.
*/
static void
teken_state_switch(teken_t *t, teken_state_t *s)
{
t->t_nextstate = s;
t->t_curnum = 0;
t->t_stateflags |= TS_FIRSTDIGIT;
}
static int
teken_state_numbers(teken_t *t, teken_char_t c)
{
teken_assert(t->t_curnum < T_NUMSIZE);
if (c >= '0' && c <= '9') {
if (t->t_stateflags & TS_FIRSTDIGIT) {
/* First digit. */
t->t_stateflags &= ~TS_FIRSTDIGIT;
t->t_nums[t->t_curnum] = c - '0';
} else if (t->t_nums[t->t_curnum] < UINT_MAX / 100) {
/*
* There is no need to continue parsing input
* once the value exceeds the size of the
* terminal. It would only allow for integer
* overflows when performing arithmetic on the
* cursor position.
*
* Ignore any further digits if the value is
* already UINT_MAX / 100.
*/
t->t_nums[t->t_curnum] =
t->t_nums[t->t_curnum] * 10 + c - '0';
}
return (1);
} else if (c == ';') {
if (t->t_stateflags & TS_FIRSTDIGIT)
t->t_nums[t->t_curnum] = 0;
/* Only allow a limited set of arguments. */
if (++t->t_curnum == T_NUMSIZE) {
teken_state_switch(t, teken_state_init);
return (1);
}
t->t_stateflags |= TS_FIRSTDIGIT;
return (1);
} else {
if (t->t_stateflags & TS_FIRSTDIGIT && t->t_curnum > 0) {
/* Finish off the last empty argument. */
t->t_nums[t->t_curnum] = 0;
t->t_curnum++;
} else if ((t->t_stateflags & TS_FIRSTDIGIT) == 0) {
/* Also count the last argument. */
t->t_curnum++;
}
}
return (0);
}
teken_color_t
teken_256to8(teken_color_t c)
{
unsigned int r, g, b;
if (c < 16) {
/* Traditional color indices. */
return (c % 8);
} else if (c >= 244) {
/* Upper grayscale colors. */
return (TC_WHITE);
} else if (c >= 232) {
/* Lower grayscale colors. */
return (TC_BLACK);
}
/* Convert to RGB. */
c -= 16;
b = c % 6;
g = (c / 6) % 6;
r = c / 36;
if (r < g) {
/* Possibly green. */
if (g < b)
return (TC_BLUE);
else if (g > b)
return (TC_GREEN);
else
return (TC_CYAN);
} else if (r > g) {
/* Possibly red. */
if (r < b)
return (TC_BLUE);
else if (r > b)
return (TC_RED);
else
return (TC_MAGENTA);
} else {
/* Possibly brown. */
if (g < b)
return (TC_BLUE);
else if (g > b)
return (TC_BROWN);
else if (r < 3)
return (TC_BLACK);
else
return (TC_WHITE);
}
}
static const char * const special_strings_cons25[] = {
[TKEY_UP] = "\x1B[A", [TKEY_DOWN] = "\x1B[B",
[TKEY_LEFT] = "\x1B[D", [TKEY_RIGHT] = "\x1B[C",
[TKEY_HOME] = "\x1B[H", [TKEY_END] = "\x1B[F",
[TKEY_INSERT] = "\x1B[L", [TKEY_DELETE] = "\x7F",
[TKEY_PAGE_UP] = "\x1B[I", [TKEY_PAGE_DOWN] = "\x1B[G",
[TKEY_F1] = "\x1B[M", [TKEY_F2] = "\x1B[N",
[TKEY_F3] = "\x1B[O", [TKEY_F4] = "\x1B[P",
[TKEY_F5] = "\x1B[Q", [TKEY_F6] = "\x1B[R",
[TKEY_F7] = "\x1B[S", [TKEY_F8] = "\x1B[T",
[TKEY_F9] = "\x1B[U", [TKEY_F10] = "\x1B[V",
[TKEY_F11] = "\x1B[W", [TKEY_F12] = "\x1B[X",
};
static const char * const special_strings_ckeys[] = {
[TKEY_UP] = "\x1BOA", [TKEY_DOWN] = "\x1BOB",
[TKEY_LEFT] = "\x1BOD", [TKEY_RIGHT] = "\x1BOC",
[TKEY_HOME] = "\x1BOH", [TKEY_END] = "\x1BOF",
};
static const char * const special_strings_normal[] = {
[TKEY_UP] = "\x1B[A", [TKEY_DOWN] = "\x1B[B",
[TKEY_LEFT] = "\x1B[D", [TKEY_RIGHT] = "\x1B[C",
[TKEY_HOME] = "\x1B[H", [TKEY_END] = "\x1B[F",
[TKEY_INSERT] = "\x1B[2~", [TKEY_DELETE] = "\x1B[3~",
[TKEY_PAGE_UP] = "\x1B[5~", [TKEY_PAGE_DOWN] = "\x1B[6~",
[TKEY_F1] = "\x1BOP", [TKEY_F2] = "\x1BOQ",
[TKEY_F3] = "\x1BOR", [TKEY_F4] = "\x1BOS",
[TKEY_F5] = "\x1B[15~", [TKEY_F6] = "\x1B[17~",
[TKEY_F7] = "\x1B[18~", [TKEY_F8] = "\x1B[19~",
[TKEY_F9] = "\x1B[20~", [TKEY_F10] = "\x1B[21~",
[TKEY_F11] = "\x1B[23~", [TKEY_F12] = "\x1B[24~",
};
const char *
teken_get_sequence(teken_t *t, unsigned int k)
{
/* Cons25 mode. */
if (t->t_stateflags & TS_CONS25 &&
k < sizeof special_strings_cons25 / sizeof(char *))
return (special_strings_cons25[k]);
/* Cursor keys mode. */
if (t->t_stateflags & TS_CURSORKEYS &&
k < sizeof special_strings_ckeys / sizeof(char *))
return (special_strings_ckeys[k]);
/* Default xterm sequences. */
if (k < sizeof special_strings_normal / sizeof(char *))
return (special_strings_normal[k]);
return (NULL);
}
#include "teken_state.h"
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