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term.c
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term.c
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#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <termios.h>
#include <unistd.h>
#include "conf.h"
#include "fbpad.h"
#define MODE_CURSOR 0x01
#define MODE_WRAP 0x02
#define MODE_ORIGIN 0x04
#define MODE_AUTOCR 0x08
#define ATTR_BOLD 0x10
#define ATTR_ITALIC 0x20
#define ATTR_REV 0x40
#define ATTR_ALL (ATTR_BOLD | ATTR_ITALIC | ATTR_REV)
#define MODE_INSERT 0x100
#define MODE_WRAPREADY 0x200
#define MODE_CLR8 0x400 /* colours 0-7 */
#define CLR_MK(fg, bg) ((fg) | ((bg) << 10))
#define CLR_FG(c) ((c) & 0x3ff)
#define CLR_BG(c) (((c) >> 10) & 0x3ff)
#define CLR_M(c) ((c) & (CLR_B | CLR_I))
#define CLR_B FN_B
#define CLR_I FN_I
#define FG 0x100
#define BG 0x101
#define LIMIT(n, a, b) ((n) < (a) ? (a) : ((n) > (b) ? (b) : (n)))
#define BIT_SET(i, b, val) ((val) ? ((i) | (b)) : ((i) & ~(b)))
#define OFFSET(r, c) ((r) * pad_cols() + (c))
struct term_state {
int row, col;
int fg, bg;
int mode;
};
struct term {
int *screen; /* screen content */
int *hist; /* scrolling history */
int *clr; /* foreground/background color */
int *dirty; /* changed rows in lazy mode */
struct term_state cur, sav; /* terminal saved state */
int fd; /* terminal file descriptor */
int hrow; /* the next history row in hist[] */
int hpos; /* scrolling history; position */
int lazy; /* lazy mode */
int pid; /* pid of the terminal program */
int top, bot; /* terminal scrolling region */
int rows, cols;
int signal; /* send SIGUSR1 and SIGUSR2 */
};
static struct term *term;
static int *screen;
static int *clr;
static int *dirty;
static int lazy;
static int row, col;
static int fg, bg;
static int top, bot;
static int mode;
static int visible;
static int clrfg = FGCOLOR;
static int clrbg = BGCOLOR;
static unsigned int clr16[16] = {
COLOR0, COLOR1, COLOR2, COLOR3, COLOR4, COLOR5, COLOR6, COLOR7,
COLOR8, COLOR9, COLORA, COLORB, COLORC, COLORD, COLORE, COLORF,
};
static int clrmap(int c)
{
int g = (c - 232) * 10 + 8;
if (c < 16)
return clr16[c];
if (c == FG)
return clrfg;
if (c == BG)
return clrbg;
if (c < 232) {
int ri = (c - 16) / 36 ;
int gi = (c - 16) % 36 / 6;
int bi = (c - 16) % 6;
int rc = ri ? (ri * 40 + 55) : 0;
int gc = gi ? (gi * 40 + 55) : 0;
int bc = bi ? (bi * 40 + 55) : 0;
return (rc << 16) | (gc << 8) | bc;
}
return (g << 16) | (g << 8) | g;
}
/* low level drawing and lazy updating */
static int color(void)
{
int c = mode & ATTR_REV ? CLR_MK(bg, fg) : CLR_MK(fg, bg);
if (mode & ATTR_BOLD)
c |= CLR_B;
if (mode & ATTR_ITALIC)
c |= CLR_I;
return c;
}
/* assumes visible && !lazy */
static void _draw_pos(int r, int c, int cursor)
{
int rev = cursor && mode & MODE_CURSOR;
int i = OFFSET(r, c);
int fg = rev ? CLR_BG(clr[i]) : CLR_FG(clr[i]);
int bg = rev ? CLR_FG(clr[i]) : CLR_BG(clr[i]);
pad_put(screen[i], r, c, CLR_M(clr[i]) | clrmap(fg), clrmap(bg));
}
/* assumes visible && !lazy */
static void _draw_row(int r)
{
int cbg, cch; /* current background and character */
int fbg, fsc = -1; /* filling background and start column */
int i;
/* call pad_fill() only once for blank columns with identical backgrounds */
for (i = 0; i < pad_cols(); i++) {
cbg = CLR_BG(clr[OFFSET(r, i)]);
cch = screen[OFFSET(r, i)] ? screen[OFFSET(r, i)] : ' ';
if (fsc >= 0 && (cbg != fbg || cch != ' ')) {
pad_fill(r, r + 1, fsc, i, clrmap(fbg));
fsc = -1;
}
if (cch != ' ') {
_draw_pos(r, i, 0);
} else if (fsc < 0) {
fsc = i;
fbg = cbg;
}
}
pad_fill(r, r + 1, fsc >= 0 ? fsc : pad_cols(), -1, clrmap(cbg));
}
static int candraw(int sr, int er)
{
int i;
if (lazy)
for (i = sr; i < er; i++)
dirty[i] = 1;
return visible && !lazy;
}
static void draw_rows(int sr, int er)
{
int i;
if (candraw(sr, er))
for (i = sr; i < er; i++)
_draw_row(i);
}
static void draw_cols(int r, int sc, int ec)
{
int i;
if (candraw(r, r + 1))
for (i = sc; i < ec; i++)
_draw_pos(r, i, 0);
}
static void draw_char(int ch, int r, int c)
{
int i = OFFSET(r, c);
screen[i] = ch;
clr[i] = color();
if (candraw(r, r + 1))
_draw_pos(r, c, 0);
}
static void draw_cursor(int put)
{
if (candraw(row, row + 1))
_draw_pos(row, col, put);
}
static void lazy_start(void)
{
memset(dirty, 0, pad_rows() * sizeof(*dirty));
lazy = 1;
}
static void lazy_flush(void)
{
int i;
if (!visible || !lazy)
return;
for (i = 0; i < pad_rows(); i++)
if (dirty[i])
_draw_row(i);
if (dirty[row])
_draw_pos(row, col, 1);
lazy = 0;
term->hpos = 0;
}
static void screen_reset(int i, int n)
{
int c;
candraw(i / pad_cols(), (i + n) / pad_cols());
memset(screen + i, 0, n * sizeof(*screen));
for (c = 0; c < n; c++)
clr[i + c] = CLR_MK(fg, bg);
}
static void screen_move(int dst, int src, int n)
{
int srow = (MIN(src, dst) + (n > 0 ? 0 : n)) / pad_cols();
int drow = (MAX(src, dst) + (n > 0 ? n : 0)) / pad_cols();
candraw(srow, drow);
memmove(screen + dst, screen + src, n * sizeof(*screen));
memmove(clr + dst, clr + src, n * sizeof(*clr));
}
/* terminal input buffering */
#define PTYLEN (1 << 16)
static char ptybuf[PTYLEN]; /* always emptied in term_read() */
static int ptylen; /* buffer length */
static int ptycur; /* current offset */
static int waitpty(int us)
{
struct pollfd ufds[1];
ufds[0].fd = term->fd;
ufds[0].events = POLLIN;
return poll(ufds, 1, us) <= 0;
}
static int readpty(void)
{
int nr;
if (ptycur < ptylen)
return (unsigned char) ptybuf[ptycur++];
if (!term->fd)
return -1;
ptylen = 0;
while ((nr = read(term->fd, ptybuf + ptylen, PTYLEN - ptylen)) > 0)
ptylen += nr;
if (!ptylen && errno == EAGAIN && !waitpty(100))
ptylen = read(term->fd, ptybuf, PTYLEN);
ptycur = 1;
return ptylen > 0 ? (unsigned char) ptybuf[0] : -1;
}
/* term interface functions */
static void term_zero(struct term *term)
{
memset(term->screen, 0, pad_rows() * pad_cols() * sizeof(term->screen[0]));
memset(term->hist, 0, NHIST * pad_cols() * sizeof(term->hist[0]));
memset(term->clr, 0, pad_rows() * pad_cols() * sizeof(term->clr[0]));
memset(term->dirty, 0, pad_rows() * sizeof(term->dirty[0]));
memset(&term->cur, 0, sizeof(term->cur));
memset(&term->sav, 0, sizeof(term->sav));
term->fd = 0;
term->hrow = 0;
term->hpos = 0;
term->lazy = 0;
term->pid = 0;
term->top = 0;
term->bot = 0;
term->rows = 0;
term->cols = 0;
term->signal = 0;
}
struct term *term_make(void)
{
struct term *term = malloc(sizeof(*term));
term->screen = malloc(pad_rows() * pad_cols() * sizeof(term->screen[0]));
term->hist = malloc(NHIST * pad_cols() * sizeof(term->hist[0]));
term->clr = malloc(pad_rows() * pad_cols() * sizeof(term->clr[0]));
term->dirty = malloc(pad_rows() * sizeof(term->dirty[0]));
term_zero(term);
return term;
}
void term_free(struct term *term)
{
free(term->screen);
free(term->hist);
free(term->clr);
free(term->dirty);
free(term);
}
int term_fd(struct term *term)
{
return term->fd;
}
void term_send(int c)
{
char b = c;
if (term->fd)
write(term->fd, &b, 1);
}
static void term_sendstr(char *s)
{
if (term->fd)
write(term->fd, s, strlen(s));
}
static void term_blank(void)
{
screen_reset(0, pad_rows() * pad_cols());
if (visible)
pad_fill(0, -1, 0, -1, clrmap(CLR_BG(color())));
}
static void ctlseq(void);
void term_read(void)
{
ctlseq();
while (ptycur < ptylen) {
if (visible && !lazy && ptylen - ptycur > 15)
lazy_start();
ctlseq();
}
lazy_flush();
}
static void term_reset(void)
{
row = col = 0;
top = 0;
bot = pad_rows();
mode = MODE_CURSOR | MODE_WRAP | MODE_CLR8;
fg = FG;
bg = BG;
term_blank();
}
static int _openpty(int *master, int *slave)
{
int unlock = 0;
int ptyno = 0;
char name[20];
if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
return -1;
if (ioctl(*master, TIOCSPTLCK, &unlock) == -1)
return -1;
if (ioctl(*master, TIOCGPTN, &ptyno) == -1)
return -1;
sprintf(name, "/dev/pts/%d", ptyno);
*slave = open(name, O_RDWR | O_NOCTTY);
return 0;
}
static void tio_setsize(int fd)
{
struct winsize winp;
winp.ws_col = pad_cols();
winp.ws_row = pad_rows();
winp.ws_xpixel = 0;
winp.ws_ypixel = 0;
ioctl(fd, TIOCSWINSZ, &winp);
}
static void tio_login(int fd)
{
setsid();
ioctl(fd, TIOCSCTTY, NULL);
tio_setsize(fd);
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
}
static void execvep(char *cmd, char **argv, char **envp)
{
char path[512];
char *p = getenv("PATH");
execve(cmd, argv, envp);
while (*p) {
char *s = path;
while (*p && *p != ':')
*s++ = *p++;
*s++ = '/';
strcpy(s, cmd);
execve(path, argv, envp);
while (*p == ':')
p++;
}
}
static void envcpy(char **d, char **s, int len)
{
int i = 0;
for (i = 0; i < len - 1 && s[i]; i++)
d[i] = s[i];
d[i] = NULL;
}
static void envset(char **d, char *env)
{
int i;
int len = strchr(env, '=') - env;
for (i = 0; d[i]; i++) {
if (memcmp(d[i], env, len))
break;
}
d[i] = env;
}
extern char **environ;
void term_exec(char **args, int swsig)
{
int master, slave;
term_zero(term);
if (_openpty(&master, &slave) == -1)
return;
if ((term->pid = fork()) == -1)
return;
if (!term->pid) {
char *envp[256] = {NULL};
char pgid[32];
snprintf(pgid, sizeof(pgid), "TERM_PGID=%d", getpid());
envcpy(envp, environ, LEN(envp) - 3);
envset(envp, "TERM=" TERM);
envset(envp, pad_fbdev());
if (swsig)
envset(envp, pgid);
tio_login(slave);
close(master);
execvep(args[0], args, envp);
exit(1);
}
close(slave);
term->fd = master;
term->rows = pad_rows();
term->cols = pad_cols();
term->signal = swsig;
fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
term_reset();
memset(term->hist, 0, NHIST * pad_cols() * sizeof(term->hist[0]));
}
static void misc_save(struct term_state *state)
{
state->row = row;
state->col = col;
state->fg = fg;
state->bg = bg;
state->mode = mode;
}
static void misc_load(struct term_state *state)
{
row = state->row;
col = state->col;
fg = state->fg;
bg = state->bg;
mode = state->mode;
}
void term_save(struct term *term)
{
visible = 0;
if (!lazy)
lazy_start();
misc_save(&term->cur);
term->top = top;
term->bot = bot;
term->lazy = lazy;
}
void term_hide(struct term *term)
{
if (term->pid > 0 && term->signal)
kill(-term->pid, SIGUSR1);
}
void term_show(struct term *term)
{
if (term->pid > 0 && term->signal)
kill(-term->pid, SIGUSR2);
}
void term_signal(struct term *term)
{
term->signal = 1;
}
static void resizeupdate(int or, int oc, int nr, int nc)
{
int dr = row >= nr ? row - nr + 1 : 0;
int dst = nc <= oc ? 0 : nr * nc - 1;
while (dst >= 0 && dst < nr * nc) {
int r = dst / nc;
int c = dst % nc;
int src = dr + r < or && c < oc ? (dr + r) * oc + c : -1;
term->screen[dst] = src >= 0 ? term->screen[src] : 0;
term->clr[dst] = src >= 0 ? term->clr[src] : color();
dst = nc <= oc ? dst + 1 : dst - 1;
}
}
/* redraw the screen; if all is zero, update changed lines only */
void term_redraw(int all)
{
if (term->fd) {
if (term->rows != pad_rows() || term->cols != pad_cols()) {
tio_setsize(term->fd);
resizeupdate(term->rows, term->cols, pad_rows(), pad_cols());
if (bot == term->rows)
bot = pad_rows();
term->rows = pad_rows();
term->cols = pad_cols();
top = MIN(top, term->rows);
bot = MIN(bot, term->rows);
row = MIN(row, term->rows - 1);
col = MIN(col, term->cols - 1);
}
if (all) {
pad_fill(pad_rows(), -1, 0, -1, clrbg);
lazy_start();
memset(dirty, 1, pad_rows() * sizeof(*dirty));
}
if (all || !term->hpos)
lazy_flush();
} else {
if (all)
pad_fill(0, -1, 0, -1, 0);
}
}
void term_load(struct term *t, int flags)
{
term = t;
misc_load(&term->cur);
screen = term->screen;
clr = term->clr;
visible = flags;
top = term->top;
bot = term->bot;
lazy = term->lazy;
dirty = term->dirty;
}
void term_end(void)
{
if (term->fd)
close(term->fd);
term_zero(term);
term_load(term, visible);
if (visible)
term_redraw(1);
}
static int writeutf8(char *dst, int c)
{
char *d = dst;
if (c < 0x80) {
*d++ = c > 0 ? c : ' ';
return 1;
}
if (c < 0x800) {
*d++ = 0xc0 | (c >> 6);
*d++ = 0x80 | (c & 0x3f);
return 2;
}
if (c < 0xffff) {
*d++ = 0xe0 | (c >> 12);
*d++ = 0x80 | ((c >> 6) & 0x3f);
*d++ = 0x80 | (c & 0x3f);
return 3;
}
*d++ = 0xf0 | (c >> 18);
*d++ = 0x80 | ((c >> 12) & 0x3f);
*d++ = 0x80 | ((c >> 6) & 0x3f);
*d++ = 0x80 | (c & 0x3f);
return 4;
}
void term_screenshot(char *path)
{
char buf[1 << 11];
int fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
int i, j;
for (i = 0; i < pad_rows(); i++) {
char *s = buf;
for (j = 0; j < pad_cols(); j++)
if (~screen[OFFSET(i, j)] & DWCHAR)
s += writeutf8(s, screen[OFFSET(i, j)]);
*s++ = '\n';
write(fd, buf, s - buf);
}
close(fd);
}
int term_colors(char *path)
{
char t[256];
FILE *fp = fopen(path, "r");
if (fp == NULL)
return 1;
while (fscanf(fp, "%31s", t) == 1) {
if (!strcmp("color", t)) {
fscanf(fp, "%x %x", &clrfg, &clrbg);
} else if (!strcmp("color16", t)) {
int i;
for (i = 0; i < 16; i++)
fscanf(fp, "%x", &clr16[i]);
} else if (!strcmp("font", t)) {
char fr[256], fi[256], fb[256];
if (fscanf(fp, "%255s %255s %255s", fr, fi, fb) == 3)
pad_font(fr, fi, fb);
}
fgets(t, sizeof(t), fp);
}
return 0;
}
/* high-level drawing functions */
static void empty_rows(int sr, int er)
{
screen_reset(OFFSET(sr, 0), (er - sr) * pad_cols());
}
static void blank_rows(int sr, int er)
{
empty_rows(sr, er);
draw_rows(sr, er);
draw_cursor(1);
}
#define HISTROW(pos) (term->hist + ((term->hrow + NHIST - (pos)) % NHIST) * pad_cols())
static void scrl_rows(int nr)
{
int i;
for (i = 0; i < nr; i++) {
memcpy(HISTROW(0), screen + i * pad_cols(),
pad_cols() * sizeof(screen[0]));
term->hrow = (term->hrow + 1) % NHIST;
}
}
void term_scrl(int scrl)
{
int i, j;
int hpos = LIMIT(term->hpos + scrl, 0, NHIST);
term->hpos = hpos;
if (!hpos) {
lazy_flush();
return;
}
lazy_start();
memset(dirty, 1, pad_rows() * sizeof(*dirty));
for (i = 0; i < pad_rows(); i++) {
int off = (i - hpos) * pad_cols();
int *_scr = i < hpos ? HISTROW(hpos - i) : term->screen + off;
int *_clr = i < hpos ? NULL : term->clr + off;
for (j = 0; j < pad_cols(); j++) {
int c = _clr ? _clr[j] : CLR_MK(BG, FG);
pad_put(_scr[j], i, j, CLR_M(c) | clrmap(CLR_FG(c)), clrmap(CLR_BG(c)));
}
}
}
static void scroll_screen(int sr, int nr, int n)
{
draw_cursor(0);
if (sr + n == 0)
scrl_rows(sr);
screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
if (n > 0)
empty_rows(sr, sr + n);
else
empty_rows(sr + nr + n, sr + nr);
draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
draw_cursor(1);
}
static void insert_lines(int n)
{
int sr = MAX(top, row);
int nr = bot - row - n;
if (nr > 0)
scroll_screen(sr, nr, n);
}
static void delete_lines(int n)
{
int r = MAX(top, row);
int sr = r + n;
int nr = bot - r - n;
if (nr > 0)
scroll_screen(sr, nr, -n);
}
static int origin(void)
{
return mode & MODE_ORIGIN;
}
static void move_cursor(int r, int c)
{
int t, b;
draw_cursor(0);
t = origin() ? top : 0;
b = origin() ? bot : pad_rows();
row = LIMIT(r, t, b - 1);
col = LIMIT(c, 0, pad_cols() - 1);
draw_cursor(1);
mode = BIT_SET(mode, MODE_WRAPREADY, 0);
}
static void set_region(int t, int b)
{
top = LIMIT(t - 1, 0, pad_rows() - 1);
bot = LIMIT(b ? b : pad_rows(), top + 1, pad_rows());
if (origin())
move_cursor(top, 0);
}
static void setattr(int m)
{
if (!m || (m / 10) == 3)
mode |= MODE_CLR8;
switch (m) {
case 0:
fg = FG;
bg = BG;
mode &= ~ATTR_ALL;
break;
case 1:
mode |= ATTR_BOLD;
break;
case 3:
mode |= ATTR_ITALIC;
break;
case 7:
mode |= ATTR_REV;
break;
case 22:
mode &= ~ATTR_BOLD;
break;
case 23:
mode &= ~ATTR_ITALIC;
break;
case 27:
mode &= ~ATTR_REV;
break;
default:
if ((m / 10) == 3)
fg = m > 37 ? FG : m - 30;
if ((m / 10) == 4)
bg = m > 47 ? BG : m - 40;
if ((m / 10) == 9)
fg = 8 + m - 90;
if ((m / 10) == 10)
bg = 8 + m - 100;
}
}
static void kill_chars(int sc, int ec)
{
int i;
for (i = sc; i < ec; i++)
draw_char(0, row, i);
draw_cursor(1);
}
static void move_chars(int sc, int nc, int n)
{
draw_cursor(0);
screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
if (n > 0)
screen_reset(OFFSET(row, sc), n);
else
screen_reset(OFFSET(row, pad_cols() + n), -n);
draw_cols(row, MIN(sc, sc + n), pad_cols());
draw_cursor(1);
}
static void delete_chars(int n)
{
int sc = col + n;
int nc = pad_cols() - sc;
move_chars(sc, nc, -n);
}
static void insert_chars(int n)
{
int nc = pad_cols() - col - n;
move_chars(col, nc, n);
}
static void advance(int dr, int dc, int scrl)
{
int r = row + dr;
int c = col + dc;
if (dr && r >= bot && scrl) {
int n = bot - r - 1;
int nr = (bot - top) + n;
if (nr > 0)
scroll_screen(top + -n, nr, n);
}
if (dr && r < top && scrl) {
int n = top - r;
int nr = (bot - top) - n;
if (nr > 0)
scroll_screen(top, nr, n);
}
r = dr ? LIMIT(r, top, bot - 1) : r;
c = LIMIT(c, 0, pad_cols() - 1);
move_cursor(r, c);
}
static void insertchar(int c)
{
if (mode & MODE_WRAPREADY)
advance(1, -col, 1);
if (mode & MODE_INSERT)
insert_chars(1);
draw_char(c, row, col);
if (col == pad_cols() - 1)
mode = BIT_SET(mode, MODE_WRAPREADY, 1);
else
advance(0, 1, 1);
}
/* partial vt102 implementation */
static void escseq(void);
static void escseq_cs(void);
static void escseq_g0(void);
static void escseq_g1(void);
static void escseq_g2(void);
static void escseq_g3(void);
static void csiseq(void);
static void csiseq_da(int c);
static void csiseq_dsr(int c);
static void modeseq(int c, int set);
/* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
static int readutf8(int c)
{
int c1, c2, c3;
if (~c & 0xc0) /* ASCII or invalid */
return c;
c1 = readpty();
if (~c & 0x20)
return ((c & 0x1f) << 6) | (c1 & 0x3f);
c2 = readpty();
if (~c & 0x10)
return ((c & 0x0f) << 12) | ((c1 & 0x3f) << 6) | (c2 & 0x3f);
c3 = readpty();
if (~c & 0x08)
return ((c & 0x07) << 18) | ((c1 & 0x3f) << 12) | ((c2 & 0x3f) << 6) | (c3 & 0x3f);
return c;
}
#define unknown(ctl, c)
/* control sequences */
static void ctlseq(void)
{
int c = readpty();
switch (c) {
case 0x09: /* HT horizontal tab to next tab stop */
advance(0, 8 - col % 8, 0);
break;
case 0x0a: /* LF line feed */
case 0x0b: /* VT line feed */
case 0x0c: /* FF line feed */
advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
break;
case 0x08: /* BS backspace one column */
advance(0, -1, 0);
break;
case 0x1b: /* ESC start escape sequence */
escseq();
break;
case 0x0d: /* CR carriage return */
advance(0, -col, 0);
break;
case 0x9b: /* CSI equivalent to ESC [ */
csiseq();
break;
case 0x00: /* NUL ignored */
case 0x07: /* BEL beep */
case 0x7f: /* DEL ignored */
break;
case 0x05: /* ENQ trigger answerback message */
case 0x0e: /* SO activate G1 character set & newline */
case 0x0f: /* SI activate G0 character set */
case 0x11: /* XON resume transmission */
case 0x13: /* XOFF stop transmission, ignore characters */
case 0x18: /* CAN interrupt escape sequence */
case 0x1a: /* SUB interrupt escape sequence */
unknown("ctlseq", c);
break;
default:
c = readutf8(c);
if (isdw(c) && col + 1 == pad_cols() && ~mode & MODE_WRAPREADY)
insertchar(0);
if (!iszw(c))
insertchar(c);
if (isdw(c))
insertchar(c | DWCHAR);
break;
}
}
#define ESCM(c) (((c) & 0xf0) == 0x20)
#define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
/* escape sequences */
static void escseq(void)
{
int c = readpty();
while (ESCM(c))
c = readpty();
switch (c) {
case '[': /* CSI control sequence introducer */
csiseq();
break;
case '%': /* CS... escseq_cs table */
escseq_cs();
break;
case '(': /* G0... escseq_g0 table */
escseq_g0();
break;
case ')': /* G1... escseq_g1 table */
escseq_g1();
break;
case '*': /* G2... escseq_g2 table */
escseq_g2();
break;
case '+': /* G3... escseq_g3 table */
escseq_g3();
break;
case '7': /* DECSC save state (position, charset, attributes) */
misc_save(&term->sav);
break;
case '8': /* DECRC restore most recently saved state */
misc_load(&term->sav);
break;
case 'M': /* RI reverse line feed */
advance(-1, 0, 1);
break;
case 'D': /* IND line feed */
advance(1, 0, 1);
break;
case 'E': /* NEL newline */
advance(1, -col, 1);
break;
case 'c': /* RIS reset */
term_reset();
break;
case 'H': /* HTS set tab stop at current column */
case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
case '>': /* DECPNM set numeric keypad mode */
case '=': /* DECPAM set application keypad mode */
case 'N': /* SS2 select G2 charset for next char only */
case 'O': /* SS3 select G3 charset for next char only */
case 'P': /* DCS device control string (ended by ST) */
case 'X': /* SOS start of string */
case '^': /* PM privacy message (ended by ST) */
case '_': /* APC application program command (ended by ST) */
case '\\': /* ST string terminator */
case 'n': /* LS2 invoke G2 charset */
case 'o': /* LS3 invoke G3 charset */
case '|': /* LS3R invoke G3 charset as GR */
case '}': /* LS2R invoke G2 charset as GR */
case '~': /* LS1R invoke G1 charset as GR */
case ']': /* OSC operating system command */
case 'g': /* BEL alternate BEL */
default:
unknown("escseq", c);
break;
}
}
static void escseq_cs(void)
{