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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 <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"
#include <pty.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 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))
static struct term *term;
static int *screen;
static int *fgs, *bgs;
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 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 < 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 fgcolor(void)
{
int c = mode & ATTR_REV ? bg : fg;
if (mode & ATTR_BOLD)
c |= FN_B;
if (mode & ATTR_ITALIC)
c |= FN_I;
return c;
}
static int bgcolor(void)
{
return mode & ATTR_REV ? fg : bg;
}
/* 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 ? bgs[i] : fgs[i];
int bg = rev ? fgs[i] : bgs[i];
pad_put(screen[i], r, c, fg, 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 = bgs[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, fbg & FN_C);
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, cbg & FN_C);
}
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;
fgs[i] = fgcolor();
bgs[i] = bgcolor();
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() + 1);
memset(screen + i, 0, n * sizeof(*screen));
for (c = 0; c < n; c++)
fgs[i + c] = fg;
for (c = 0; c < n; c++)
bgs[i + c] = 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() + 1;
candraw(srow, drow);
memmove(screen + dst, screen + src, n * sizeof(*screen));
memmove(fgs + dst, fgs + src, n * sizeof(*fgs));
memmove(bgs + dst, bgs + src, n * sizeof(*bgs));
}
/* 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 */
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, bgcolor() & FN_C);
}
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 = FGCOLOR;
bg = BGCOLOR;
term_blank();
}
static int _openpty(int *master, int *slave)
{
return openpty(master, slave, NULL, NULL, NULL );
/*
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 _login(int fd)
{
struct winsize winp;
winp.ws_col = pad_cols();
winp.ws_row = pad_rows();
winp.ws_xpixel = 0;
winp.ws_ypixel = 0;
setsid();
ioctl(fd, TIOCSCTTY, NULL);
ioctl(fd, TIOCSWINSZ, &winp);
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
}
#define MAXENV (1 << 8)
static void envcpy(char **d, char **s)
{
while (*s)
*d++ = *s++;
*d = NULL;
}
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++;
}
}
extern char **environ;
void term_exec(char **args)
{
int master, slave;
memset(term, 0, sizeof(*term));
if (_openpty(&master, &slave) == -1)
return;
if ((term->pid = fork()) == -1)
return;
if (!term->pid) {
char *envp[MAXENV] = {"TERM=" TERM};
envcpy(envp + 1, environ);
_login(slave);
close(master);
execvep(args[0], args, envp);
exit(1);
}
close(slave);
term->fd = master;
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, sizeof(term->hist));
}
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;
}
/* redraw the screen; if all is zero, update changed lines only */
void term_redraw(int all)
{
if (term->fd) {
if (all) {
pad_fill(pad_rows(), -1, 0, -1, BGCOLOR);
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;
fgs = term->fgs;
bgs = term->bgs;
visible = flags;
top = term->top;
bot = term->bot;
lazy = term->lazy;
dirty = term->dirty;
}
void term_end(void)
{
if (term->fd)
close(term->fd);
memset(term, 0, sizeof(*term));
term_load(term, visible);
if (visible)
term_redraw(1);
}
static int writeutf8(char *dst, int c)
{
char *d = dst;
int l;
if (c > 0xffff) {
*d++ = 0xf0 | (c >> 18);
l = 3;
} else if (c > 0x7ff) {
*d++ = 0xe0 | (c >> 12);
l = 2;
} else if (c > 0x7f) {
*d++ = 0xc0 | (c >> 6);
l = 1;
} else {
*d++ = c > 0 ? c : ' ';
l = 0;
}
while (l--)
*d++ = 0x80 | ((c >> (l * 6)) & 0x3f);
return d - dst;
}
void term_screenshot(void)
{
char buf[1 << 11];
int fd = open(SCRSHOT, 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);
}
/* 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 *_fgs = i < hpos ? NULL : term->fgs + off;
int *_bgs = i < hpos ? NULL : term->bgs + off;
for (j = 0; j < pad_cols(); j++)
pad_put(_scr[j], i, j, _fgs ? _fgs[j] : BGCOLOR,
_bgs ? _bgs[j] : FGCOLOR);
}
}
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 = FGCOLOR;
bg = BGCOLOR;
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 ? FGCOLOR : clrmap(m - 30);
if ((m / 10) == 4)
bg = m > 47 ? BGCOLOR : clrmap(m - 40);
if ((m / 10) == 9)
fg = clrmap(8 + m - 90);
if ((m / 10) == 10)
bg = clrmap(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 result;
int l = 1;
if (~c & 0xc0)
return c;
while (l < 6 && c & (0x40 >> l))
l++;
result = (0x3f >> l) & c;
while (l--)
result = (result << 6) | (readpty() & 0x3f);
return result;
}
#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)
{
int c = readpty();
switch (c) {
case '@': /* CSDFL select default charset (ISO646/8859-1) */
case 'G': /* CSUTF8 select UTF-8 */
case '8': /* CSUTF8 select UTF-8 (obsolete) */
default:
unknown("escseq_cs", c);
break;
}
}
static void escseq_g0(void)
{
int c = readpty();
switch (c) {
case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
case '0': /* G0GFX G0 charset = VT100 graphics mapping */
case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
case 'K': /* G0USR G0 charset = user defined mapping */
case 'B': /* G0TXT G0 charset = ASCII mapping */
default:
unknown("escseq_g0", c);
break;
}
}
static void escseq_g1(void)
{
int c = readpty();
switch (c) {
case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
case '0': /* G1GFX G1 charset = VT100 graphics mapping */
case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
case 'K': /* G1USR G1 charset = user defined mapping */
case 'B': /* G1TXT G1 charset = ASCII mapping */
default:
unknown("escseq_g1", c);
break;
}
}
static void escseq_g2(void)
{
int c = readpty();
switch (c) {
case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
case '0': /* G2GFX G2 charset = VT100 graphics mapping */
case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
case 'K': /* G2USR G2 charset = user defined mapping */
default:
unknown("escseq_g2", c);
break;
}
}
static void escseq_g3(void)
{
int c = readpty();
switch (c) {
case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
case '0': /* G3GFX G3 charset = VT100 graphics mapping */
case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
case 'K': /* G3USR G3 charset = user defined mapping */
default:
unknown("escseq_g3", c);
break;
}
}
static int absrow(int r)
{
return origin() ? top + r : r;
}
#define CSIP(c) (((c) & 0xf0) == 0x30)
#define CSII(c) (((c) & 0xf0) == 0x20)
#define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
#define MAXCSIARGS 32
/* ECMA-48 CSI sequences */
static void csiseq(void)
{
int args[MAXCSIARGS + 8] = {0};
int i;
int n = 0;
int c = readpty();
int priv = 0;
if (strchr("<=>?", c)) {
priv = c;
c = readpty();
}
while (CSIP(c)) {
int arg = 0;
while (isdigit(c)) {
arg = arg * 10 + (c - '0');
c = readpty();
}
if (CSIP(c))
c = readpty();
if (n < MAXCSIARGS)
args[n++] = arg;
}
while (CSII(c))
c = readpty();
switch (c) {
case 'H': /* CUP move cursor to row, column */
case 'f': /* HVP move cursor to row, column */
move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
break;
case 'J': /* ED erase display */
switch (args[0]) {
case 0:
kill_chars(col, pad_cols());
blank_rows(row + 1, pad_rows());
break;
case 1:
kill_chars(0, col + 1);
blank_rows(0, row - 1);
break;
case 2:
term_blank();
break;
}
break;
case 'A': /* CUU move cursor up */
advance(-MAX(1, args[0]), 0, 0);
break;
case 'e': /* VPR move cursor down */
case 'B': /* CUD move cursor down */
advance(MAX(1, args[0]), 0, 0);
break;
case 'a': /* HPR move cursor right */
case 'C': /* CUF move cursor right */
advance(0, MAX(1, args[0]), 0);
break;
case 'D': /* CUB move cursor left */
advance(0, -MAX(1, args[0]), 0);
break;
case 'K': /* EL erase line */
switch (args[0]) {
case 0:
kill_chars(col, pad_cols());
break;
case 1:
kill_chars(0, col + 1);
break;
case 2:
kill_chars(0, pad_cols());
break;
}
break;
case 'L': /* IL insert blank lines */
if (row >= top && row < bot)
insert_lines(MAX(1, args[0]));
break;
case 'M': /* DL delete lines */
if (row >= top && row < bot)
delete_lines(MAX(1, args[0]));
break;
case 'd': /* VPA move to row (current column) */
move_cursor(absrow(MAX(1, args[0]) - 1), col);
break;
case 'm': /* SGR set graphic rendition */