st.c

// See LICENSE for license details.
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <unistd.h>
#include <wchar.h>

#include "st.h"
#include "win.h"

#if   defined(__linux)
 #include <pty.h>
#elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
 #include <util.h>
#elif defined(__FreeBSD__) || defined(__DragonFly__)
 #include <libutil.h>
#endif

// Arbitrary sizes
#define UTF_INVALID   0xFFFD
#define UTF_SIZ       4
#define ESC_BUF_SIZ   (128*UTF_SIZ)
#define ESC_ARG_SIZ   16
#define STR_BUF_SIZ   ESC_BUF_SIZ
#define STR_ARG_SIZ   ESC_ARG_SIZ

// macros
#define IS_SET(flag)		((term.mode & (flag)) != 0)
#define NUMMAXLEN(x)		((int)(sizeof(x) * 2.56 + 0.5) + 1)
#define ISCONTROLC0(c)		(BETWEEN(c, 0, 0x1f) || (c) == '\177')
#define ISCONTROLC1(c)		(BETWEEN(c, 0x80, 0x9f))
#define ISCONTROL(c)		(ISCONTROLC0(c) || ISCONTROLC1(c))
#define ISDELIM(u)		(utf8strchr(worddelimiters, u) != NULL)

// constants
#define ISO14755CMD		"dmenu -w \"$WINDOWID\" -p codepoint: </dev/null"

enum term_mode {
	MODE_WRAP        = 1 << 0,
	MODE_INSERT      = 1 << 1,
	MODE_ALTSCREEN   = 1 << 2,
	MODE_CRLF        = 1 << 3,
	MODE_ECHO        = 1 << 4,
	MODE_PRINT       = 1 << 5,
	MODE_UTF8        = 1 << 6,
	MODE_SIXEL       = 1 << 7,
};

enum cursor_movement {
	CURSOR_SAVE,
	CURSOR_LOAD
};

enum cursor_state {
	CURSOR_DEFAULT  = 0,
	CURSOR_WRAPNEXT = 1,
	CURSOR_ORIGIN   = 2
};

enum charset {
	CS_GRAPHIC0,
	CS_GRAPHIC1,
	CS_UK,
	CS_USA,
	CS_MULTI,
	CS_GER,
	CS_FIN
};

enum escape_state {
	ESC_START      = 1,
	ESC_CSI        = 2,
	ESC_STR        = 4,  // OSC, PM, APC
	ESC_ALTCHARSET = 8,
	ESC_STR_END    = 16, // a final string was encountered
	ESC_TEST       = 32, // Enter in test mode
	ESC_UTF8       = 64,
	ESC_DCS        =128,
};

typedef struct {
	Glyph attr; // current char attributes
	int x;
	int y;
	char state;
} TCursor;

typedef struct {
	int mode;
	int type;
	int snap;
	/*
	 * Selection variables:
	 * nb – normalized coordinates of the beginning of the selection
	 * ne – normalized coordinates of the end of the selection
	 * ob – original coordinates of the beginning of the selection
	 * oe – original coordinates of the end of the selection
	 */
	struct {
		int x, y;
	} nb, ne, ob, oe;

	int alt;
} Selection;

// Internal representation of the screen
typedef struct {
	int row;         // nb row
	int col;         // nb col
	Line *line;      // screen
	Line *alt;       // alternate screen 
	Line hist[HISTSIZE]; // history buffer
	int histi;       // history index
	int scr;         // scroll back
	int *dirty;      // dirtyness of lines
	TCursor c;       // cursor
	int ocx;         // old cursor col
	int ocy;         // old cursor row
	int top;         // top    scroll limit
	int bot;         // bottom scroll limit
	int mode;        // terminal mode flags
	int esc;         // escape state flags
	char trantbl[4]; // charset table translation
	int charset;     // current charset
	int icharset;    // selected charset for sequence
	int *tabs;
} Term;

/* CSI Escape sequence structs
 * ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
typedef struct {
	char buf[ESC_BUF_SIZ]; // raw string
	int len;               // raw string length
	char priv;
	int arg[ESC_ARG_SIZ];
	int narg;              // nb of args
	char mode[2];
} CSIEscape;

/* STR Escape sequence structs
 * ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
typedef struct {
	char type;             // ESC type ...
	char buf[STR_BUF_SIZ]; // raw string
	int len;               // raw string length
	char *args[STR_ARG_SIZ];
	int narg;              // nb of args
} STREscape;

static void execsh(char *, char **);
static void stty(char **);
static void sigchld(int);
static void ttywriteraw(const char *, size_t);

static void csidump(void);
static void csihandle(void);
static void csiparse(void);
static void csireset(void);
static int eschandle(uchar);
static void strdump(void);
static void strhandle(void);
static void strparse(void);
static void strreset(void);

static void tprinter(char *, size_t);
static void tdumpsel(void);
static void tdumpline(int);
static void tdump(void);
static void tclearregion(int, int, int, int);
static void tcursor(int);
static void tdeletechar(int);
static void tdeleteline(int);
static void tinsertblank(int);
static void tinsertblankline(int);
static int tlinelen(int);
static void tmoveto(int, int);
static void tmoveato(int, int);
static void tnewline(int);
static void tputtab(int);
static void tputc(Rune);
static void treset(void);
static void tscrollup(int, int, int);
static void tscrolldown(int, int, int);
static void tsetattr(int *, int);
static void tsetchar(Rune, Glyph *, int, int);
static void tsetdirt(int, int);
static void tsetscroll(int, int);
static void tswapscreen(void);
static void tsetmode(int, int, int *, int);
static int twrite(const char *, int, int);
static void tfulldirt(void);
static void tcontrolcode(uchar );
static void tdectest(char );
static void tdefutf8(char);
static int32_t tdefcolor(int *, int *, int);
static void tdeftran(char);
static void tstrsequence(uchar);

static void drawregion(int, int, int, int);

static void selnormalize(void);
static void selscroll(int, int);
static void selsnap(int *, int *, int);

static size_t utf8decode(const char *, Rune *, size_t);
static Rune utf8decodebyte(char, size_t *);
static char utf8encodebyte(Rune, size_t);
static char *utf8strchr(char *, Rune);
static size_t utf8validate(Rune *, size_t);

static char *base64dec(const char *);
static char base64dec_getc(const char **);

static ssize_t xwrite(int, const char *, size_t);

// Globals
static Term term;
static Selection sel;
static CSIEscape csiescseq;
static STREscape strescseq;
static int iofd = 1;
static int cmdfd;
static pid_t pid;

static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
static Rune utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
static Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};

ssize_t
xwrite(int fd, const char *s, size_t len)
{
	size_t aux = len;
	ssize_t r;

	while (len > 0) {
		r = write(fd, s, len);
		if (r < 0)
			return r;
		len -= r;
		s += r;
	}

	return aux;
}

void *
xmalloc(size_t len)
{
	void *p = malloc(len);

	if (!p)
		die("Out of memory\n");

	return p;
}

void *
xrealloc(void *p, size_t len)
{
	if ((p = realloc(p, len)) == NULL)
		die("Out of memory\n");

	return p;
}

char *
xstrdup(char *s)
{
	if ((s = strdup(s)) == NULL)
		die("Out of memory\n");

	return s;
}

size_t
utf8decode(const char *c, Rune *u, size_t clen)
{
	size_t i, j, len, type;
	Rune udecoded;

	*u = UTF_INVALID;
	if (!clen)
		return 0;
	udecoded = utf8decodebyte(c[0], &len);
	if (!BETWEEN(len, 1, UTF_SIZ))
		return 1;
	for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
		udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
		if (type != 0)
			return j;
	}
	if (j < len)
		return 0;
	*u = udecoded;
	utf8validate(u, len);

	return len;
}

Rune
utf8decodebyte(char c, size_t *i)
{
	for (*i = 0; *i < LEN(utfmask); ++(*i))
		if (((uchar)c & utfmask[*i]) == utfbyte[*i])
			return (uchar)c & ~utfmask[*i];

	return 0;
}

size_t
utf8encode(Rune u, char *c)
{
	size_t len, i;

	len = utf8validate(&u, 0);
	if (len > UTF_SIZ)
		return 0;

	for (i = len - 1; i != 0; --i) {
		c[i] = utf8encodebyte(u, 0);
		u >>= 6;
	}
	c[0] = utf8encodebyte(u, len);

	return len;
}

char
utf8encodebyte(Rune u, size_t i)
{
	return utfbyte[i] | (u & ~utfmask[i]);
}

char *
utf8strchr(char *s, Rune u)
{
	Rune r;
	size_t i, j, len;

	len = strlen(s);
	for (i = 0, j = 0; i < len; i += j) {
		if (!(j = utf8decode(&s[i], &r, len - i)))
			break;
		if (r == u)
			return &(s[i]);
	}

	return NULL;
}

size_t
utf8validate(Rune *u, size_t i)
{
	if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
		*u = UTF_INVALID;
	for (i = 1; *u > utfmax[i]; ++i)
		;

	return i;
}

static const char base64_digits[] = {
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0,
	63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, -1, 0, 0, 0, 0, 1,
	2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
	22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34,
	35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

char
base64dec_getc(const char **src)
{
	while (**src && !isprint(**src)) (*src)++;
	return *((*src)++);
}

char *
base64dec(const char *src)
{
	size_t in_len = strlen(src);
	char *result, *dst;

	if (in_len % 4)
		in_len += 4 - (in_len % 4);
	result = dst = xmalloc(in_len / 4 * 3 + 1);
	while (*src) {
		int a = base64_digits[(unsigned char) base64dec_getc(&src)];
		int b = base64_digits[(unsigned char) base64dec_getc(&src)];
		int c = base64_digits[(unsigned char) base64dec_getc(&src)];
		int d = base64_digits[(unsigned char) base64dec_getc(&src)];

		*dst++ = (a << 2) | ((b & 0x30) >> 4);
		if (c == -1)
			break;
		*dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
		if (d == -1)
			break;
		*dst++ = ((c & 0x03) << 6) | d;
	}
	*dst = '\0';
	return result;
}

void
selinit(void)
{
	sel.mode = SEL_IDLE;
	sel.snap = 0;
	sel.ob.x = -1;
}

int
tlinelen(int y)
{
	int i = term.col;

	if (TLINE(y)[i - 1].mode & ATTR_WRAP)
		return i;

	while (i > 0 && TLINE(y)[i - 1].u == ' ')
		--i;

	return i;
}

void
selstart(int col, int row, int snap)
{
	selclear();
	sel.mode = SEL_EMPTY;
	sel.type = SEL_REGULAR;
	sel.snap = snap;
	sel.oe.x = sel.ob.x = col;
	sel.oe.y = sel.ob.y = row;
	selnormalize();

	if (sel.snap != 0)
		sel.mode = SEL_READY;
	tsetdirt(sel.nb.y, sel.ne.y);
}

void
selextend(int col, int row, int type, int done)
{
	int oldey, oldex, oldsby, oldsey, oldtype;

	if (sel.mode == SEL_IDLE)
		return;
	if (done && sel.mode == SEL_EMPTY) {
		selclear();
		return;
	}

	oldey = sel.oe.y;
	oldex = sel.oe.x;
	oldsby = sel.nb.y;
	oldsey = sel.ne.y;
	oldtype = sel.type;

	sel.alt = IS_SET(MODE_ALTSCREEN);
	sel.oe.x = col;
	sel.oe.y = row;
	selnormalize();
	sel.type = type;

	if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type)
		tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));

	sel.mode = done ? SEL_IDLE : SEL_READY;
}

void
selnormalize(void)
{
	int i;

	if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
		sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
		sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
	} else {
		sel.nb.x = MIN(sel.ob.x, sel.oe.x);
		sel.ne.x = MAX(sel.ob.x, sel.oe.x);
	}
	sel.nb.y = MIN(sel.ob.y, sel.oe.y);
	sel.ne.y = MAX(sel.ob.y, sel.oe.y);

	selsnap(&sel.nb.x, &sel.nb.y, -1);
	selsnap(&sel.ne.x, &sel.ne.y, +1);

	// expand selection over line breaks
	if (sel.type == SEL_RECTANGULAR)
		return;
	i = tlinelen(sel.nb.y);
	if (i < sel.nb.x)
		sel.nb.x = i;
	if (tlinelen(sel.ne.y) <= sel.ne.x)
		sel.ne.x = term.col - 1;
}

int
selected(int x, int y)
{
	if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
			sel.alt != IS_SET(MODE_ALTSCREEN))
		return 0;

	if (sel.type == SEL_RECTANGULAR)
		return BETWEEN(y, sel.nb.y, sel.ne.y)
		    && BETWEEN(x, sel.nb.x, sel.ne.x);

	return BETWEEN(y, sel.nb.y, sel.ne.y)
	    && (y != sel.nb.y || x >= sel.nb.x)
	    && (y != sel.ne.y || x <= sel.ne.x);
}

void
selsnap(int *x, int *y, int direction)
{
	int newx, newy, xt, yt;
	int delim, prevdelim;
	Glyph *gp, *prevgp;

	switch (sel.snap) {
	case SNAP_WORD:
		/*
		 * Snap around if the word wraps around at the end or
		 * beginning of a line.
		 */
		prevgp = &TLINE(*y)[*x];
		prevdelim = ISDELIM(prevgp->u);
		for (;;) {
			newx = *x + direction;
			newy = *y;
			if (!BETWEEN(newx, 0, term.col - 1)) {
				newy += direction;
				newx = (newx + term.col) % term.col;
				if (!BETWEEN(newy, 0, term.row - 1))
					break;

				if (direction > 0)
					yt = *y, xt = *x;
				else
					yt = newy, xt = newx;
				if (!(TLINE(yt)[xt].mode & ATTR_WRAP))
					break;
			}

			if (newx >= tlinelen(newy))
				break;

			gp = &TLINE(newy)[newx];
			delim = ISDELIM(gp->u);
			if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
					|| (delim && gp->u != prevgp->u)))
				break;

			*x = newx;
			*y = newy;
			prevgp = gp;
			prevdelim = delim;
		}
		break;
	case SNAP_LINE:
		/*
		 * Snap around if the the previous line or the current one
		 * has set ATTR_WRAP at its end. Then the whole next or
		 * previous line will be selected.
		 */
		*x = (direction < 0) ? 0 : term.col - 1;
		if (direction < 0) {
			for (; *y > 0; *y += direction) {
				if (!(TLINE(*y-1)[term.col-1].mode
						& ATTR_WRAP)) {
					break;
				}
			}
		} else if (direction > 0) {
			for (; *y < term.row-1; *y += direction) {
				if (!(TLINE(*y)[term.col-1].mode
						& ATTR_WRAP)) {
					break;
				}
			}
		}
		break;
	}
}

char *
getsel(void)
{
	char *str, *ptr;
	int y, bufsize, lastx, linelen;
	Glyph *gp, *last;

	if (sel.ob.x == -1)
		return NULL;

	bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
	ptr = str = xmalloc(bufsize);

	// append every set & selected glyph to the selection
	for (y = sel.nb.y; y <= sel.ne.y; y++) {
		if ((linelen = tlinelen(y)) == 0) {
			*ptr++ = '\n';
			continue;
		}

		if (sel.type == SEL_RECTANGULAR) {
			gp = &TLINE(y)[sel.nb.x];
			lastx = sel.ne.x;
		} else {
			gp = &TLINE(y)[sel.nb.y == y ? sel.nb.x : 0];
			lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
		}
		last = &TLINE(y)[MIN(lastx, linelen-1)];
		while (last >= gp && last->u == ' ')
			--last;

		for ( ; gp <= last; ++gp) {
			if (gp->mode & ATTR_WDUMMY)
				continue;

			ptr += utf8encode(gp->u, ptr);
		}

		/*
		 * Copy and pasting of line endings is inconsistent
		 * in the inconsistent terminal and GUI world.
		 * The best solution seems like to produce '\n' when
		 * something is copied from st and convert '\n' to
		 * '\r', when something to be pasted is received by
		 * st.
		 * FIXME: Fix the computer world.
		 */
		if ((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
			*ptr++ = '\n';
	}
	*ptr = 0;
	return str;
}

void
selclear(void)
{
	if (sel.ob.x == -1)
		return;
	sel.mode = SEL_IDLE;
	sel.ob.x = -1;
	tsetdirt(sel.nb.y, sel.ne.y);
}

void
die(const char *errstr, ...)
{
	va_list ap;

	va_start(ap, errstr);
	vfprintf(stderr, errstr, ap);
	va_end(ap);
	exit(1);
}

void
execsh(char *cmd, char **args)
{
	char *sh, *prog;
	const struct passwd *pw;

	errno = 0;
	if ((pw = getpwuid(getuid())) == NULL) {
		if (errno)
			die("getpwuid:%s\n", strerror(errno));
		else
			die("who are you?\n");
	}

	if ((sh = getenv("SHELL")) == NULL)
		sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;

	if (args)
		prog = args[0];
	else if (utmp)
		prog = utmp;
	else
		prog = sh;
	DEFAULT(args, ((char *[]) {prog, NULL}));

	unsetenv("COLUMNS");
	unsetenv("LINES");
	unsetenv("TERMCAP");
	setenv("LOGNAME", pw->pw_name, 1);
	setenv("USER", pw->pw_name, 1);
	setenv("SHELL", sh, 1);
	setenv("HOME", pw->pw_dir, 1);
	setenv("TERM", termname, 1);

	signal(SIGCHLD, SIG_DFL);
	signal(SIGHUP, SIG_DFL);
	signal(SIGINT, SIG_DFL);
	signal(SIGQUIT, SIG_DFL);
	signal(SIGTERM, SIG_DFL);
	signal(SIGALRM, SIG_DFL);

	execvp(prog, args);
	_exit(1);
}

void
sigchld(int a)
{
	int stat;
	pid_t p;

	if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
		die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));

	if (pid != p)
		return;

	if (WIFEXITED(stat) && WEXITSTATUS(stat))
		die("child exited with status %d\n", WEXITSTATUS(stat));
	else if (WIFSIGNALED(stat))
		die("child terminated due to signal %d\n", WTERMSIG(stat));
	exit(0);
}

void
stty(char **args)
{
	char cmd[_POSIX_ARG_MAX], **p, *q, *s;
	size_t n, siz;

	if ((n = strlen(stty_args)) > sizeof(cmd)-1)
		die("incorrect stty parameters\n");
	memcpy(cmd, stty_args, n);
	q = cmd + n;
	siz = sizeof(cmd) - n;
	for (p = args; p && (s = *p); ++p) {
		if ((n = strlen(s)) > siz-1)
			die("stty parameter length too long\n");
		*q++ = ' ';
		memcpy(q, s, n);
		q += n;
		siz -= n + 1;
	}
	*q = '\0';
	if (system(cmd) != 0)
		perror("Couldn't call stty");
}

int
ttynew(char *line, char *cmd, char *out, char **args)
{
	int m, s;

	if (out) {
		term.mode |= MODE_PRINT;
		iofd = (!strcmp(out, "-")) ?
			  1 : open(out, O_WRONLY | O_CREAT, 0666);
		if (iofd < 0) {
			fprintf(stderr, "Error opening %s:%s\n",
				out, strerror(errno));
		}
	}

	if (line) {
		if ((cmdfd = open(line, O_RDWR)) < 0)
			die("open line failed: %s\n", strerror(errno));
		dup2(cmdfd, 0);
		stty(args);
		return cmdfd;
	}

	// seems to work fine on linux, openbsd and freebsd
	if (openpty(&m, &s, NULL, NULL, NULL) < 0)
		die("openpty failed: %s\n", strerror(errno));

	switch (pid = fork()) {
	case -1:
		die("fork failed\n");
		break;
	case 0:
		close(iofd);
		setsid(); // create a new process group
		dup2(s, 0);
		dup2(s, 1);
		dup2(s, 2);
		if (ioctl(s, TIOCSCTTY, NULL) < 0)
			die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
		close(s);
		close(m);
		execsh(cmd, args);
		break;
	default:
		close(s);
		cmdfd = m;
		signal(SIGCHLD, sigchld);
		break;
	}
	return cmdfd;
}

size_t
ttyread(void)
{
	static char buf[BUFSIZ];
	static int buflen = 0;
	int written;
	int ret;

	// append read bytes to unprocessed bytes
	if ((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
		die("Couldn't read from shell: %s\n", strerror(errno));
	buflen += ret;

	written = twrite(buf, buflen, 0);
	buflen -= written;
	// keep any uncomplete utf8 char for the next call
	if (buflen > 0)
		memmove(buf, buf + written, buflen);

	if (term.scr > 0 && term.scr < HISTSIZE-1)
		term.scr++;

	return ret;
}

void
ttywrite(const char *s, size_t n, int may_echo)
{
	const char *next;
	Arg arg = (Arg) { .i = term.scr };

	kscrolldown(&arg);

	if (may_echo && IS_SET(MODE_ECHO))
		twrite(s, n, 1);

	if (!IS_SET(MODE_CRLF)) {
		ttywriteraw(s, n);
		return;
	}

	// This is similar to how the kernel handles ONLCR for ttys
	while (n > 0) {
		if (*s == '\r') {
			next = s + 1;
			ttywriteraw("\r\n", 2);
		} else {
			next = memchr(s, '\r', n);
			DEFAULT(next, s + n);
			ttywriteraw(s, next - s);
		}
		n -= next - s;
		s = next;
	}
}

void
ttywriteraw(const char *s, size_t n)
{
	fd_set wfd, rfd;
	ssize_t r;
	size_t lim = 256;

	/*
	 * Remember that we are using a pty, which might be a modem line.
	 * Writing too much will clog the line. That's why we are doing this
	 * dance.
	 * FIXME: Migrate the world to Plan 9.
	 */
	while (n > 0) {
		FD_ZERO(&wfd);
		FD_ZERO(&rfd);
		FD_SET(cmdfd, &wfd);
		FD_SET(cmdfd, &rfd);

		/* Check if we can write. */
		if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) {
			if (errno == EINTR)
				continue;
			die("select failed: %s\n", strerror(errno));
		}
		if (FD_ISSET(cmdfd, &wfd)) {
			/*
			 * Only write the bytes written by ttywrite() or the
			 * default of 256. This seems to be a reasonable value
			 * for a serial line. Bigger values might clog the I/O.
			 */
			if ((r = write(cmdfd, s, (n < lim)? n : lim)) < 0)
				goto write_error;
			if (r < n) {
				/*
				 * We weren't able to write out everything.
				 * This means the buffer is getting full
				 * again. Empty it.
				 */
				if (n < lim)
					lim = ttyread();
				n -= r;
				s += r;
			} else {
				// All bytes have been written.
				break;
			}
		}
		if (FD_ISSET(cmdfd, &rfd))
			lim = ttyread();
	}
	return;

write_error:
	die("write error on tty: %s\n", strerror(errno));
}

void
ttyresize(int tw, int th)
{
	struct winsize w;

	w.ws_row = term.row;
	w.ws_col = term.col;
	w.ws_xpixel = tw;
	w.ws_ypixel = th;
	if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
		fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
}

void
ttyhangup()
{
	// Send SIGHUP to shell
	kill(pid, SIGHUP);
}

int
tattrset(int attr)
{
	int i, j;

	for (i = 0; i < term.row-1; i++) {
		for (j = 0; j < term.col-1; j++) {
			if (term.line[i][j].mode & attr)
				return 1;
		}
	}

	return 0;
}

void
tsetdirt(int top, int bot)
{
	int i;

	LIMIT(top, 0, term.row-1);
	LIMIT(bot, 0, term.row-1);

	for (i = top; i <= bot; i++)
		term.dirty[i] = 1;
}

void
tsetdirtattr(int attr)
{
	int i, j;

	for (i = 0; i < term.row-1; i++) {
		for (j = 0; j < term.col-1; j++) {
			if (term.line[i][j].mode & attr) {
				tsetdirt(i, i);
				break;
			}
		}
	}
}

void
tfulldirt(void)
{
	tsetdirt(0, term.row-1);
}

void
tcursor(int mode)
{
	static TCursor c[2];
	int alt = IS_SET(MODE_ALTSCREEN);

	if (mode == CURSOR_SAVE) {
		c[alt] = term.c;
	} else if (mode == CURSOR_LOAD) {
		term.c = c[alt];
		tmoveto(c[alt].x, c[alt].y);
	}
}

void
treset(void)
{
	uint i;

	term.c = (TCursor){{
		.mode = ATTR_NULL,
		.fg = defaultfg,
		.bg = defaultbg
	}, .x = 0, .y = 0, .state = CURSOR_DEFAULT};

	memset(term.tabs, 0, term.col * sizeof(*term.tabs));
	for (i = tabspaces; i < term.col; i += tabspaces)
		term.tabs[i] = 1;
	term.top = 0;
	term.bot = term.row - 1;
	term.mode = MODE_WRAP|MODE_UTF8;
	memset(term.trantbl, CS_USA, sizeof(term.trantbl));
	term.charset = 0;

	for (i = 0; i < 2; i++) {
		tmoveto(0, 0);
		tcursor(CURSOR_SAVE);
		tclearregion(0, 0, term.col-1, term.row-1);
		tswapscreen();
	}
}

void
tnew(int col, int row)
{
	term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
	tresize(col, row);
	treset();
}

void
tswapscreen(void)
{
	Line *tmp = term.line;

	term.line = term.alt;
	term.alt = tmp;
	term.mode ^= MODE_ALTSCREEN;
	tfulldirt();
}

void
kscrolldown(const Arg* a)
{
	int n = a->i;

	if (n < 0)
		n = term.row + n;

	if (n > term.scr)
		n = term.scr;

	if (term.scr > 0) {
		term.scr -= n;
		selscroll(0, -n);
		tfulldirt();
	}
}

void
kscrollup(const Arg* a)
{
	int n = a->i;

	if (n < 0)
		n = term.row + n;

	if (term.scr <= HISTSIZE-n) {
		term.scr += n;
		selscroll(0, n);
		tfulldirt();
	}
}


void
tscrolldown(int orig, int n, int copyhist)
{
	int i;
	Line temp;

	LIMIT(n, 0, term.bot-orig+1);

	if (copyhist) {
		term.histi = (term.histi - 1 + HISTSIZE) % HISTSIZE;
		temp = term.hist[term.histi];
		term.hist[term.histi] = term.line[term.bot];
		term.line[term.bot] = temp;
	}

	tsetdirt(orig, term.bot-n);
	tclearregion(0, term.bot-n+1, term.col-1, term.bot);

	for (i = term.bot; i >= orig+n; i--) {
		temp = term.line[i];
		term.line[i] = term.line[i-n];
		term.line[i-n] = temp;
	}

	selscroll(orig, n);
}

void
tscrollup(int orig, int n, int copyhist)
{
	int i;
	Line temp;

	LIMIT(n, 0, term.bot-orig+1);

	if (copyhist) {
		term.histi = (term.histi + 1) % HISTSIZE;
		temp = term.hist[term.histi];
		term.hist[term.histi] = term.line[orig];
		term.line[orig] = temp;
	}

	tclearregion(0, orig, term.col-1, orig+n-1);
	tsetdirt(orig+n, term.bot);

	for (i = orig; i <= term.bot-n; i++) {
		temp = term.line[i];
		term.line[i] = term.line[i+n];
		term.line[i+n] = temp;
	}

	selscroll(orig, -n);
}

void
selscroll(int orig, int n)
{
	if (sel.ob.x == -1)
		return;

	if (BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
		if ((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
			selclear();
			return;
		}
		if (sel.type == SEL_RECTANGULAR) {
			if (sel.ob.y < term.top)
				sel.ob.y = term.top;
			if (sel.oe.y > term.bot)
				sel.oe.y = term.bot;
		} else {
			if (sel.ob.y < term.top) {
				sel.ob.y = term.top;
				sel.ob.x = 0;
			}
			if (sel.oe.y > term.bot) {
				sel.oe.y = term.bot;
				sel.oe.x = term.col;
			}
		}
		selnormalize();
	}
}

void
tnewline(int first_col)
{
	int y = term.c.y;

	if (y == term.bot) {
		tscrollup(term.top, 1, 1);
	} else {
		y++;
	}
	tmoveto(first_col ? 0 : term.c.x, y);
}

void
csiparse(void)
{
	char *p = csiescseq.buf, *np;
	long int v;

	csiescseq.narg = 0;
	if (*p == '?') {
		csiescseq.priv = 1;
		p++;
	}

	csiescseq.buf[csiescseq.len] = '\0';
	while (p < csiescseq.buf+csiescseq.len) {
		np = NULL;
		v = strtol(p, &np, 10);
		if (np == p)
			v = 0;
		if (v == LONG_MAX || v == LONG_MIN)
			v = -1;
		csiescseq.arg[csiescseq.narg++] = v;
		p = np;
		if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
			break;
		p++;
	}
	csiescseq.mode[0] = *p++;
	csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
}

// for absolute user moves, when decom is set
void
tmoveato(int x, int y)
{
	tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
}

void
tmoveto(int x, int y)
{
	int miny, maxy;

	if (term.c.state & CURSOR_ORIGIN) {
		miny = term.top;
		maxy = term.bot;
	} else {
		miny = 0;
		maxy = term.row - 1;
	}
	term.c.state &= ~CURSOR_WRAPNEXT;
	term.c.x = LIMIT(x, 0, term.col-1);
	term.c.y = LIMIT(y, miny, maxy);
}

void
tsetchar(Rune u, Glyph *attr, int x, int y)
{
	static char *vt100_0[62] = { // 0x41 - 0x7e
		"↑", "↓", "→", "←", "█", "▚", "☃", // A - G
		0, 0, 0, 0, 0, 0, 0, 0, // H - O
		0, 0, 0, 0, 0, 0, 0, 0, // P - W
		0, 0, 0, 0, 0, 0, 0, " ", // X - _
		"◆", "▒", "␉", "␌", "␍", "␊", "°", "±", // ` - g
		"␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", // h - o
		"⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", // p - w
		"│", "≤", "≥", "π", "≠", "£", "·", // x - ~
	};

	/*
	 * The table is proudly stolen from rxvt.
	 */
	if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
	   BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
		utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);

	if (term.line[y][x].mode & ATTR_WIDE) {
		if (x+1 < term.col) {
			term.line[y][x+1].u = ' ';
			term.line[y][x+1].mode &= ~ATTR_WDUMMY;
		}
	} else if (term.line[y][x].mode & ATTR_WDUMMY) {
		term.line[y][x-1].u = ' ';
		term.line[y][x-1].mode &= ~ATTR_WIDE;
	}

	term.dirty[y] = 1;
	term.line[y][x] = *attr;
	term.line[y][x].u = u;
}

void
tclearregion(int x1, int y1, int x2, int y2)
{
	int x, y, temp;
	Glyph *gp;

	if (x1 > x2)
		temp = x1, x1 = x2, x2 = temp;
	if (y1 > y2)
		temp = y1, y1 = y2, y2 = temp;

	LIMIT(x1, 0, term.col-1);
	LIMIT(x2, 0, term.col-1);
	LIMIT(y1, 0, term.row-1);
	LIMIT(y2, 0, term.row-1);

	for (y = y1; y <= y2; y++) {
		term.dirty[y] = 1;
		for (x = x1; x <= x2; x++) {
			gp = &term.line[y][x];
			if (selected(x, y))
				selclear();
			gp->fg = term.c.attr.fg;
			gp->bg = term.c.attr.bg;
			gp->mode = 0;
			gp->u = ' ';
		}
	}
}

void
tdeletechar(int n)
{
	int dst, src, size;
	Glyph *line;

	LIMIT(n, 0, term.col - term.c.x);

	dst = term.c.x;
	src = term.c.x + n;
	size = term.col - src;
	line = term.line[term.c.y];

	memmove(&line[dst], &line[src], size * sizeof(Glyph));
	tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
}

void
tinsertblank(int n)
{
	int dst, src, size;
	Glyph *line;

	LIMIT(n, 0, term.col - term.c.x);

	dst = term.c.x + n;
	src = term.c.x;
	size = term.col - dst;
	line = term.line[term.c.y];

	memmove(&line[dst], &line[src], size * sizeof(Glyph));
	tclearregion(src, term.c.y, dst - 1, term.c.y);
}

void
tinsertblankline(int n)
{
	if (BETWEEN(term.c.y, term.top, term.bot))
		tscrolldown(term.c.y, n, 0);
}

void
tdeleteline(int n)
{
	if (BETWEEN(term.c.y, term.top, term.bot))
		tscrollup(term.c.y, n, 0);
}

int32_t
tdefcolor(int *attr, int *npar, int l)
{
	int32_t idx = -1;
	uint r, g, b;

	switch (attr[*npar + 1]) {
	case 2: // direct color in RGB space
		if (*npar + 4 >= l) {
			fprintf(stderr,
				"erresc(38): Incorrect number of parameters (%d)\n",
				*npar);
			break;
		}
		r = attr[*npar + 2];
		g = attr[*npar + 3];
		b = attr[*npar + 4];
		*npar += 4;
		if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
			fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
				r, g, b);
		else
			idx = TRUECOLOR(r, g, b);
		break;
	case 5: // indexed color
		if (*npar + 2 >= l) {
			fprintf(stderr,
				"erresc(38): Incorrect number of parameters (%d)\n",
				*npar);
			break;
		}
		*npar += 2;
		if (!BETWEEN(attr[*npar], 0, 255))
			fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
		else
			idx = attr[*npar];
		break;
	case 0: // implemented defined (only foreground)
	case 1: // transparent
	case 3: // direct color in CMY space
	case 4: // direct color in CMYK space
	default:
		fprintf(stderr,
		        "erresc(38): gfx attr %d unknown\n", attr[*npar]);
		break;
	}

	return idx;
}

void
tsetattr(int *attr, int l)
{
	int i;
	int32_t idx;

	for (i = 0; i < l; i++) {
		switch (attr[i]) {
		case 0:
			term.c.attr.mode &= ~(
				ATTR_BOLD       |
				ATTR_FAINT      |
				ATTR_ITALIC     |
				ATTR_UNDERLINE  |
				ATTR_BLINK      |
				ATTR_REVERSE    |
				ATTR_INVISIBLE  |
				ATTR_STRUCK     );
			term.c.attr.fg = defaultfg;
			term.c.attr.bg = defaultbg;
			break;
		case 1:
			term.c.attr.mode |= ATTR_BOLD;
			break;
		case 2:
			term.c.attr.mode |= ATTR_FAINT;
			break;
		case 3:
			term.c.attr.mode |= ATTR_ITALIC;
			break;
		case 4:
			term.c.attr.mode |= ATTR_UNDERLINE;
			break;
		case 5: // slow blink
			// FALLTHROUGH
		case 6: // rapid blink
			term.c.attr.mode |= ATTR_BLINK;
			break;
		case 7:
			term.c.attr.mode |= ATTR_REVERSE;
			break;
		case 8:
			term.c.attr.mode |= ATTR_INVISIBLE;
			break;
		case 9:
			term.c.attr.mode |= ATTR_STRUCK;
			break;
		case 22:
			term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
			break;
		case 23:
			term.c.attr.mode &= ~ATTR_ITALIC;
			break;
		case 24:
			term.c.attr.mode &= ~ATTR_UNDERLINE;
			break;
		case 25:
			term.c.attr.mode &= ~ATTR_BLINK;
			break;
		case 27:
			term.c.attr.mode &= ~ATTR_REVERSE;
			break;
		case 28:
			term.c.attr.mode &= ~ATTR_INVISIBLE;
			break;
		case 29:
			term.c.attr.mode &= ~ATTR_STRUCK;
			break;
		case 38:
			if ((idx = tdefcolor(attr, &i, l)) >= 0)
				term.c.attr.fg = idx;
			break;
		case 39:
			term.c.attr.fg = defaultfg;
			break;
		case 48:
			if ((idx = tdefcolor(attr, &i, l)) >= 0)
				term.c.attr.bg = idx;
			break;
		case 49:
			term.c.attr.bg = defaultbg;
			break;
		default:
			if (BETWEEN(attr[i], 30, 37)) {
				term.c.attr.fg = attr[i] - 30;
			} else if (BETWEEN(attr[i], 40, 47)) {
				term.c.attr.bg = attr[i] - 40;
			} else if (BETWEEN(attr[i], 90, 97)) {
				term.c.attr.fg = attr[i] - 90 + 8;
			} else if (BETWEEN(attr[i], 100, 107)) {
				term.c.attr.bg = attr[i] - 100 + 8;
			} else {
				fprintf(stderr,
					"erresc(default): gfx attr %d unknown\n",
					attr[i]);
				csidump();
			}
			break;
		}
	}
}

void
tsetscroll(int t, int b)
{
	int temp;

	LIMIT(t, 0, term.row-1);
	LIMIT(b, 0, term.row-1);
	if (t > b) {
		temp = t;
		t = b;
		b = temp;
	}
	term.top = t;
	term.bot = b;
}

void
tsetmode(int priv, int set, int *args, int narg)
{
	int alt, *lim;

	for (lim = args + narg; args < lim; ++args) {
		if (priv) {
			switch (*args) {
			case 1: // DECCKM -- Cursor key
				xsetmode(set, MODE_APPCURSOR);
				break;
			case 5: // DECSCNM -- Reverse video
				xsetmode(set, MODE_REVERSE);
				break;
			case 6: // DECOM -- Origin
				MODBIT(term.c.state, set, CURSOR_ORIGIN);
				tmoveato(0, 0);
				break;
			case 7: // DECAWM -- Auto wrap
				MODBIT(term.mode, set, MODE_WRAP);
				break;
			case 0:  // Error (IGNORED)
			case 2:  // DECANM -- ANSI/VT52 (IGNORED)
			case 3:  // DECCOLM -- Column  (IGNORED)
			case 4:  // DECSCLM -- Scroll (IGNORED)
			case 8:  // DECARM -- Auto repeat (IGNORED)
			case 18: // DECPFF -- Printer feed (IGNORED)
			case 19: // DECPEX -- Printer extent (IGNORED)
			case 42: // DECNRCM -- National characters (IGNORED)
			case 12: // att610 -- Start blinking cursor (IGNORED)
				break;
			case 25: // DECTCEM -- Text Cursor Enable Mode
				xsetmode(!set, MODE_HIDE);
				break;
			case 9:    // X10 mouse compatibility mode
				xsetpointermotion(0);
				xsetmode(0, MODE_MOUSE);
				xsetmode(set, MODE_MOUSEX10);
				break;
			case 1000: // 1000: report button press
				xsetpointermotion(0);
				xsetmode(0, MODE_MOUSE);
				xsetmode(set, MODE_MOUSEBTN);
				break;
			case 1002: // 1002: report motion on button press
				xsetpointermotion(0);
				xsetmode(0, MODE_MOUSE);
				xsetmode(set, MODE_MOUSEMOTION);
				break;
			case 1003: // 1003: enable all mouse motions
				xsetpointermotion(set);
				xsetmode(0, MODE_MOUSE);
				xsetmode(set, MODE_MOUSEMANY);
				break;
			case 1004: // 1004: send focus events to tty
				xsetmode(set, MODE_FOCUS);
				break;
			case 1006: // 1006: extended reporting mode
				xsetmode(set, MODE_MOUSESGR);
				break;
			case 1034:
				xsetmode(set, MODE_8BIT);
				break;
			case 1049: // swap screen & set/restore cursor as xterm
				if (!allowaltscreen)
					break;
				tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
				// FALLTHROUGH
			case 47: // swap screen
			case 1047:
				if (!allowaltscreen)
					break;
				alt = IS_SET(MODE_ALTSCREEN);
				if (alt) {
					tclearregion(0, 0, term.col-1,
							term.row-1);
				}
				if (set ^ alt) // set is always 1 or 0
					tswapscreen();
				if (*args != 1049)
					break;
				// FALLTHROUGH
			case 1048:
				tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
				break;
			case 2004: // 2004: bracketed paste mode
				xsetmode(set, MODE_BRCKTPASTE);
				break;
			// Not implemented mouse modes. See comments there.
			case 1001: /* mouse highlight mode; can hang the
				      terminal by design when implemented. */
			case 1005: /* UTF-8 mouse mode; will confuse
				      applications not supporting UTF-8
				      and luit. */
			case 1015: /* urxvt mangled mouse mode; incompatible
				      and can be mistaken for other control
				      codes. */
			default:
				fprintf(stderr,
					"erresc: unknown private set/reset mode %d\n",
					*args);
				break;
			}
		} else {
			switch (*args) {
			case 0:  // Error (IGNORED)
				break;
			case 2:
				xsetmode(set, MODE_KBDLOCK);
				break;
			case 4:  // IRM -- Insertion-replacement
				MODBIT(term.mode, set, MODE_INSERT);
				break;
			case 12: // SRM -- Send/Receive
				MODBIT(term.mode, !set, MODE_ECHO);
				break;
			case 20: // LNM -- Linefeed/new line
				MODBIT(term.mode, set, MODE_CRLF);
				break;
			default:
				fprintf(stderr,
					"erresc: unknown set/reset mode %d\n",
					*args);
				break;
			}
		}
	}
}

void
csihandle(void)
{
	char buf[40];
	int len;

	switch (csiescseq.mode[0]) {
	default:
	unknown:
		fprintf(stderr, "erresc: unknown csi ");
		csidump();
		// die("");
		break;
	case '@': // ICH -- Insert <n> blank char
		DEFAULT(csiescseq.arg[0], 1);
		tinsertblank(csiescseq.arg[0]);
		break;
	case 'A': // CUU -- Cursor <n> Up
		DEFAULT(csiescseq.arg[0], 1);
		tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
		break;
	case 'B': // CUD -- Cursor <n> Down
	case 'e': // VPR --Cursor <n> Down
		DEFAULT(csiescseq.arg[0], 1);
		tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
		break;
	case 'i': // MC -- Media Copy
		switch (csiescseq.arg[0]) {
		case 0:
			tdump();
			break;
		case 1:
			tdumpline(term.c.y);
			break;
		case 2:
			tdumpsel();
			break;
		case 4:
			term.mode &= ~MODE_PRINT;
			break;
		case 5:
			term.mode |= MODE_PRINT;
			break;
		}
		break;
	case 'c': // DA -- Device Attributes
		if (csiescseq.arg[0] == 0)
			ttywrite(vtiden, strlen(vtiden), 0);
		break;
	case 'C': // CUF -- Cursor <n> Forward
	case 'a': // HPR -- Cursor <n> Forward
		DEFAULT(csiescseq.arg[0], 1);
		tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
		break;
	case 'D': // CUB -- Cursor <n> Backward
		DEFAULT(csiescseq.arg[0], 1);
		tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
		break;
	case 'E': // CNL -- Cursor <n> Down and first col
		DEFAULT(csiescseq.arg[0], 1);
		tmoveto(0, term.c.y+csiescseq.arg[0]);
		break;
	case 'F': // CPL -- Cursor <n> Up and first col
		DEFAULT(csiescseq.arg[0], 1);
		tmoveto(0, term.c.y-csiescseq.arg[0]);
		break;
	case 'g': // TBC -- Tabulation clear
		switch (csiescseq.arg[0]) {
		case 0: // clear current tab stop
			term.tabs[term.c.x] = 0;
			break;
		case 3: // clear all the tabs
			memset(term.tabs, 0, term.col * sizeof(*term.tabs));
			break;
		default:
			goto unknown;
		}
		break;
	case 'G': // CHA -- Move to <col>
	case '`': // HPA */
		DEFAULT(csiescseq.arg[0], 1);
		tmoveto(csiescseq.arg[0]-1, term.c.y);
		break;
	case 'H': // CUP -- Move to <row> <col>
	case 'f': // HVP
		DEFAULT(csiescseq.arg[0], 1);
		DEFAULT(csiescseq.arg[1], 1);
		tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
		break;
	case 'I': // CHT -- Cursor Forward Tabulation <n> tab stops
		DEFAULT(csiescseq.arg[0], 1);
		tputtab(csiescseq.arg[0]);
		break;
	case 'J': // ED -- Clear screen
		switch (csiescseq.arg[0]) {
		case 0: // below
			tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
			if (term.c.y < term.row-1) {
				tclearregion(0, term.c.y+1, term.col-1,
						term.row-1);
			}
			break;
		case 1: // above
			if (term.c.y > 1)
				tclearregion(0, 0, term.col-1, term.c.y-1);
			tclearregion(0, term.c.y, term.c.x, term.c.y);
			break;
		case 2: // all
			tclearregion(0, 0, term.col-1, term.row-1);
			break;
		default:
			goto unknown;
		}
		break;
	case 'K': // EL -- Clear line
		switch (csiescseq.arg[0]) {
		case 0: // right
			tclearregion(term.c.x, term.c.y, term.col-1,
					term.c.y);
			break;
		case 1: // left
			tclearregion(0, term.c.y, term.c.x, term.c.y);
			break;
		case 2: // all
			tclearregion(0, term.c.y, term.col-1, term.c.y);
			break;
		}
		break;
	case 'S': // SU -- Scroll <n> line up
		DEFAULT(csiescseq.arg[0], 1);
		tscrollup(term.top, csiescseq.arg[0], 0);
		break;
	case 'T': // SD -- Scroll <n> line down
		DEFAULT(csiescseq.arg[0], 1);
		tscrolldown(term.top, csiescseq.arg[0], 0);
		break;
	case 'L': // IL -- Insert <n> blank lines
		DEFAULT(csiescseq.arg[0], 1);
		tinsertblankline(csiescseq.arg[0]);
		break;
	case 'l': // RM -- Reset Mode
		tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
		break;
	case 'M': // DL -- Delete <n> lines
		DEFAULT(csiescseq.arg[0], 1);
		tdeleteline(csiescseq.arg[0]);
		break;
	case 'X': // ECH -- Erase <n> char
		DEFAULT(csiescseq.arg[0], 1);
		tclearregion(term.c.x, term.c.y,
				term.c.x + csiescseq.arg[0] - 1, term.c.y);
		break;
	case 'P': // DCH -- Delete <n> char
		DEFAULT(csiescseq.arg[0], 1);
		tdeletechar(csiescseq.arg[0]);
		break;
	case 'Z': // CBT -- Cursor Backward Tabulation <n> tab stops
		DEFAULT(csiescseq.arg[0], 1);
		tputtab(-csiescseq.arg[0]);
		break;
	case 'd': // VPA -- Move to <row>
		DEFAULT(csiescseq.arg[0], 1);
		tmoveato(term.c.x, csiescseq.arg[0]-1);
		break;
	case 'h': // SM -- Set terminal mode
		tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
		break;
	case 'm': // SGR -- Terminal attribute (color)
		tsetattr(csiescseq.arg, csiescseq.narg);
		break;
	case 'n': // DSR – Device Status Report (cursor position)
		if (csiescseq.arg[0] == 6) {
			len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
					term.c.y+1, term.c.x+1);
			ttywrite(buf, len, 0);
		}
		break;
	case 'r': // DECSTBM -- Set Scrolling Region
		if (csiescseq.priv) {
			goto unknown;
		} else {
			DEFAULT(csiescseq.arg[0], 1);
			DEFAULT(csiescseq.arg[1], term.row);
			tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
			tmoveato(0, 0);
		}
		break;
	case 's': // DECSC -- Save cursor position (ANSI.SYS)
		tcursor(CURSOR_SAVE);
		break;
	case 'u': // DECRC -- Restore cursor position (ANSI.SYS)
		tcursor(CURSOR_LOAD);
		break;
	case ' ':
		switch (csiescseq.mode[1]) {
		case 'q': // DECSCUSR -- Set Cursor Style
			if (xsetcursor(csiescseq.arg[0]))
				goto unknown;
			break;
		default:
			goto unknown;
		}
		break;
	}
}

void
csidump(void)
{
	int i;
	uint c;

	fprintf(stderr, "ESC[");
	for (i = 0; i < csiescseq.len; i++) {
		c = csiescseq.buf[i] & 0xff;
		if (isprint(c)) {
			putc(c, stderr);
		} else if (c == '\n') {
			fprintf(stderr, "(\\n)");
		} else if (c == '\r') {
			fprintf(stderr, "(\\r)");
		} else if (c == 0x1b) {
			fprintf(stderr, "(\\e)");
		} else {
			fprintf(stderr, "(%02x)", c);
		}
	}
	putc('\n', stderr);
}

void
csireset(void)
{
	memset(&csiescseq, 0, sizeof(csiescseq));
}

void
strhandle(void)
{
	char *p = NULL;
	int j, narg, par;

	term.esc &= ~(ESC_STR_END|ESC_STR);
	strparse();
	par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;

	switch (strescseq.type) {
	case ']': // OSC -- Operating System Command
		switch (par) {
		case 0:
		case 1:
		case 2:
			if (narg > 1)
				xsettitle(strescseq.args[1]);
			return;
		case 52:
			if (narg > 2) {
				char *dec;

				dec = base64dec(strescseq.args[2]);
				if (dec) {
					xsetsel(dec);
					xclipcopy();
				} else {
					fprintf(stderr, "erresc: invalid base64\n");
				}
			}
			return;
		case 4: // color set
			if (narg < 3)
				break;
			p = strescseq.args[2];
			// FALLTHROUGH
		case 104: /* color reset, here p = NULL */
			j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
			if (xsetcolorname(j, p)) {
				fprintf(stderr, "erresc: invalid color %s\n", p);
			} else {
				/*
				 * TODO if defaultbg color is changed, borders
				 * are dirty
				 */
				redraw();
			}
			return;
		}
		break;
	case 'k': // old title set compatibility
		xsettitle(strescseq.args[0]);
		return;
	case 'P': // DCS -- Device Control String
		term.mode |= ESC_DCS;
	case '_': // APC -- Application Program Command
	case '^': // PM -- Privacy Message
		return;
	}

	fprintf(stderr, "erresc: unknown str ");
	strdump();
}

void
strparse(void)
{
	int c;
	char *p = strescseq.buf;

	strescseq.narg = 0;
	strescseq.buf[strescseq.len] = '\0';

	if (*p == '\0')
		return;

	while (strescseq.narg < STR_ARG_SIZ) {
		strescseq.args[strescseq.narg++] = p;
		while ((c = *p) != ';' && c != '\0')
			++p;
		if (c == '\0')
			return;
		*p++ = '\0';
	}
}

void
strdump(void)
{
	int i;
	uint c;

	fprintf(stderr, "ESC%c", strescseq.type);
	for (i = 0; i < strescseq.len; i++) {
		c = strescseq.buf[i] & 0xff;
		if (c == '\0') {
			putc('\n', stderr);
			return;
		} else if (isprint(c)) {
			putc(c, stderr);
		} else if (c == '\n') {
			fprintf(stderr, "(\\n)");
		} else if (c == '\r') {
			fprintf(stderr, "(\\r)");
		} else if (c == 0x1b) {
			fprintf(stderr, "(\\e)");
		} else {
			fprintf(stderr, "(%02x)", c);
		}
	}
	fprintf(stderr, "ESC\\\n");
}

void
strreset(void)
{
	memset(&strescseq, 0, sizeof(strescseq));
}

void
sendbreak(const Arg *arg)
{
	if (tcsendbreak(cmdfd, 0))
		perror("Error sending break");
}

void
tprinter(char *s, size_t len)
{
	if (iofd != -1 && xwrite(iofd, s, len) < 0) {
		perror("Error writing to output file");
		close(iofd);
		iofd = -1;
	}
}

void
externalpipe(const Arg *arg)
{
	int to[2];
	char buf[UTF_SIZ];
	void (*oldsigpipe)(int);
	Glyph *bp, *end;
	int lastpos, n, newline;

	if (pipe(to) == -1)
		return;

	switch (fork()) {
	case -1:
		close(to[0]);
		close(to[1]);
		return;
	case 0:
		dup2(to[0], STDIN_FILENO);
		close(to[0]);
		close(to[1]);
		execvp(((char **)arg->v)[0], (char **)arg->v);
		fprintf(stderr, "st: execvp %s\n", ((char **)arg->v)[0]);
		perror("failed");
		exit(0);
	}

	close(to[0]);
	// ignore sigpipe for now, in case child exists early
	oldsigpipe = signal(SIGPIPE, SIG_IGN);
	newline = 0;
	for (n = 0; n < term.row; n++) {
		bp = term.line[n];
		lastpos = MIN(tlinelen(n) + 1, term.col) - 1;
		if (lastpos < 0)
			break;
		end = &bp[lastpos + 1];
		for (; bp < end; ++bp)
			if (xwrite(to[1], buf, utf8encode(bp->u, buf)) < 0)
				break;
		if ((newline = term.line[n][lastpos].mode & ATTR_WRAP))
			continue;
		if (xwrite(to[1], "\n", 1) < 0)
			break;
		newline = 0;
	}
	if (newline)
		(void)xwrite(to[1], "\n", 1);
	close(to[1]);
	// restore
	signal(SIGPIPE, oldsigpipe);
}

void
iso14755(const Arg *arg)
{
	FILE *p;
	char *us, *e, codepoint[9], uc[UTF_SIZ];
	unsigned long utf32;

	if (!(p = popen(ISO14755CMD, "r")))
		return;

	us = fgets(codepoint, sizeof(codepoint), p);
	pclose(p);

	if (!us || *us == '\0' || *us == '-' || strlen(us) > 7)
		return;
	if ((utf32 = strtoul(us, &e, 16)) == ULONG_MAX ||
	    (*e != '\n' && *e != '\0'))
		return;

	ttywrite(uc, utf8encode(utf32, uc), 1);
}

void
toggleprinter(const Arg *arg)
{
	term.mode ^= MODE_PRINT;
}

void
printscreen(const Arg *arg)
{
	tdump();
}

void
printsel(const Arg *arg)
{
	tdumpsel();
}

void
tdumpsel(void)
{
	char *ptr;

	if ((ptr = getsel())) {
		tprinter(ptr, strlen(ptr));
		free(ptr);
	}
}

void
tdumpline(int n)
{
	char buf[UTF_SIZ];
	Glyph *bp, *end;

	bp = &term.line[n][0];
	end = &bp[MIN(tlinelen(n), term.col) - 1];
	if (bp != end || bp->u != ' ') {
		for ( ;bp <= end; ++bp)
			tprinter(buf, utf8encode(bp->u, buf));
	}
	tprinter("\n", 1);
}

void
tdump(void)
{
	int i;

	for (i = 0; i < term.row; ++i)
		tdumpline(i);
}

void
tputtab(int n)
{
	uint x = term.c.x;

	if (n > 0) {
		while (x < term.col && n--)
			for (++x; x < term.col && !term.tabs[x]; ++x)
				/* nothing */ ;
	} else if (n < 0) {
		while (x > 0 && n++)
			for (--x; x > 0 && !term.tabs[x]; --x)
				/* nothing */ ;
	}
	term.c.x = LIMIT(x, 0, term.col-1);
}

void
tdefutf8(char ascii)
{
	if (ascii == 'G')
		term.mode |= MODE_UTF8;
	else if (ascii == '@')
		term.mode &= ~MODE_UTF8;
}

void
tdeftran(char ascii)
{
	static char cs[] = "0B";
	static int vcs[] = {CS_GRAPHIC0, CS_USA};
	char *p;

	if ((p = strchr(cs, ascii)) == NULL) {
		fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
	} else {
		term.trantbl[term.icharset] = vcs[p - cs];
	}
}

void
tdectest(char c)
{
	int x, y;

	if (c == '8') { // DEC screen alignment test.
		for (x = 0; x < term.col; ++x) {
			for (y = 0; y < term.row; ++y)
				tsetchar('E', &term.c.attr, x, y);
		}
	}
}

void
tstrsequence(uchar c)
{
	strreset();

	switch (c) {
	case 0x90:   // DCS -- Device Control String
		c = 'P';
		term.esc |= ESC_DCS;
		break;
	case 0x9f:   // APC -- Application Program Command
		c = '_';
		break;
	case 0x9e:   // PM -- Privacy Message
		c = '^';
		break;
	case 0x9d:   // OSC -- Operating System Command
		c = ']';
		break;
	}
	strescseq.type = c;
	term.esc |= ESC_STR;
}

void
tcontrolcode(uchar ascii)
{
	switch (ascii) {
	case '\t':   // HT
		tputtab(1);
		return;
	case '\b':   // BS
		tmoveto(term.c.x-1, term.c.y);
		return;
	case '\r':   // CR
		tmoveto(0, term.c.y);
		return;
	case '\f':   // LF 
	case '\v':   // VT 
	case '\n':   // LF 
		// go to first col if the mode is set
		tnewline(IS_SET(MODE_CRLF));
		return;
	case '\a':   // BEL
		if (term.esc & ESC_STR_END) {
			// backwards compatibility to xterm
			strhandle();
		} else {
			xbell();
		}
		break;
	case '\033': // ESC
		csireset();
		term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
		term.esc |= ESC_START;
		return;
	case '\016': // SO (LS1 -- Locking shift 1)
	case '\017': // SI (LS0 -- Locking shift 0)
		term.charset = 1 - (ascii - '\016');
		return;
	case '\032': // SUB 
		tsetchar('?', &term.c.attr, term.c.x, term.c.y);
	case '\030': // CAN
		csireset();
		break;
	case '\005': // ENQ (IGNORED)
	case '\000': // NUL (IGNORED)
	case '\021': // XON (IGNORED)
	case '\023': // XOFF (IGNORED)
	case 0177:   // DEL (IGNORED)
		return;
	case 0x80:   // TODO: PAD
	case 0x81:   // TODO: HOP
	case 0x82:   // TODO: BPH
	case 0x83:   // TODO: NBH
	case 0x84:   // TODO: IND
		break;
	case 0x85:   // NEL -- Next line
		tnewline(1); // always go to first col
		break;
	case 0x86:   // TODO: SSA
	case 0x87:   // TODO: ESA
		break;
	case 0x88:   // HTS -- Horizontal tab stop 
		term.tabs[term.c.x] = 1;
		break;
	case 0x89:   // TODO: HTJ
	case 0x8a:   // TODO: VTS
	case 0x8b:   // TODO: PLD
	case 0x8c:   // TODO: PLU
	case 0x8d:   // TODO: RI
	case 0x8e:   // TODO: SS2
	case 0x8f:   // TODO: SS3
	case 0x91:   // TODO: PU1
	case 0x92:   // TODO: PU2
	case 0x93:   // TODO: STS
	case 0x94:   // TODO: CCH
	case 0x95:   // TODO: MW
	case 0x96:   // TODO: SPA
	case 0x97:   // TODO: EPA
	case 0x98:   // TODO: SOS
	case 0x99:   // TODO: SGCI
		break;
	case 0x9a:   // DECID -- Identify Terminal
		ttywrite(vtiden, strlen(vtiden), 0);
		break;
	case 0x9b:   // TODO: CSI
	case 0x9c:   // TODO: ST
		break;
	case 0x90:   // DCS -- Device Control String
	case 0x9d:   // OSC -- Operating System Command
	case 0x9e:   // PM -- Privacy Message
	case 0x9f:   // APC -- Application Program Command
		tstrsequence(ascii);
		return;
	}
	// only CAN, SUB, \a and C1 chars interrupt a sequence
	term.esc &= ~(ESC_STR_END|ESC_STR);
}

/*
 * returns 1 when the sequence is finished and it hasn't to read
 * more characters for this sequence, otherwise 0
 */
int
eschandle(uchar ascii)
{
	switch (ascii) {
	case '[':
		term.esc |= ESC_CSI;
		return 0;
	case '#':
		term.esc |= ESC_TEST;
		return 0;
	case '%':
		term.esc |= ESC_UTF8;
		return 0;
	case 'P': // DCS -- Device Control String
	case '_': // APC -- Application Program Command
	case '^': // PM -- Privacy Message
	case ']': // OSC -- Operating System Command
	case 'k': // old title set compatibility
		tstrsequence(ascii);
		return 0;
	case 'n': // LS2 -- Locking shift 2
	case 'o': // LS3 -- Locking shift 3
		term.charset = 2 + (ascii - 'n');
		break;
	case '(': // GZD4 -- set primary charset G0
	case ')': // G1D4 -- set secondary charset G1
	case '*': // G2D4 -- set tertiary charset G2
	case '+': // G3D4 -- set quaternary charset G3
		term.icharset = ascii - '(';
		term.esc |= ESC_ALTCHARSET;
		return 0;
	case 'D': // IND -- Linefeed
		if (term.c.y == term.bot) {
			tscrollup(term.top, 1, 1);
		} else {
			tmoveto(term.c.x, term.c.y+1);
		}
		break;
	case 'E': // NEL -- Next line
		tnewline(1); // always go to first col
		break;
	case 'H': // HTS -- Horizontal tab stop
		term.tabs[term.c.x] = 1;
		break;
	case 'M': // RI -- Reverse index
		if (term.c.y == term.top) {
			tscrolldown(term.top, 1, 1);
		} else {
			tmoveto(term.c.x, term.c.y-1);
		}
		break;
	case 'Z': // DECID -- Identify Terminal
		ttywrite(vtiden, strlen(vtiden), 0);
		break;
	case 'c': // RIS -- Reset to initial state
		treset();
		resettitle();
		xloadcols();
		break;
	case '=': // DECPAM -- Application keypad
		xsetmode(1, MODE_APPKEYPAD);
		break;
	case '>': // DECPNM -- Normal keypad
		xsetmode(0, MODE_APPKEYPAD);
		break;
	case '7': // DECSC -- Save Cursor
		tcursor(CURSOR_SAVE);
		break;
	case '8': // DECRC -- Restore Cursor
		tcursor(CURSOR_LOAD);
		break;
	case '\\': // ST -- String Terminator
		if (term.esc & ESC_STR_END)
			strhandle();
		break;
	default:
		fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
			(uchar) ascii, isprint(ascii)? ascii:'.');
		break;
	}
	return 1;
}

void
tputc(Rune u)
{
	char c[UTF_SIZ];
	int control;
	int width, len;
	Glyph *gp;

	control = ISCONTROL(u);
	if (!IS_SET(MODE_UTF8) && !IS_SET(MODE_SIXEL)) {
		c[0] = u;
		width = len = 1;
	} else {
		len = utf8encode(u, c);
		if (!control && (width = wcwidth(u)) == -1) {
			memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
			width = 1;
		}
	}

	if (IS_SET(MODE_PRINT))
		tprinter(c, len);

	/*
	 * STR sequence must be checked before anything else
	 * because it uses all following characters until it
	 * receives a ESC, a SUB, a ST or any other C1 control
	 * character.
	 */
	if (term.esc & ESC_STR) {
		if (u == '\a' || u == 030 || u == 032 || u == 033 ||
		   ISCONTROLC1(u)) {
			term.esc &= ~(ESC_START|ESC_STR|ESC_DCS);
			if (IS_SET(MODE_SIXEL)) {
				/* TODO: render sixel */;
				term.mode &= ~MODE_SIXEL;
				return;
			}
			term.esc |= ESC_STR_END;
			goto check_control_code;
		}


		if (IS_SET(MODE_SIXEL)) {
			// TODO: implement sixel mode
			return;
		}
		if (term.esc&ESC_DCS && strescseq.len == 0 && u == 'q')
			term.mode |= MODE_SIXEL;

		if (strescseq.len+len >= sizeof(strescseq.buf)-1) {
			/*
			 * Here is a bug in terminals. If the user never sends
			 * some code to stop the str or esc command, then st
			 * will stop responding. But this is better than
			 * silently failing with unknown characters. At least
			 * then users will report back.
			 *
			 * In the case users ever get fixed, here is the code:
			 */
			/*
			 * term.esc = 0;
			 * strhandle();
			 */
			return;
		}

		memmove(&strescseq.buf[strescseq.len], c, len);
		strescseq.len += len;
		return;
	}

check_control_code:
	/*
	 * Actions of control codes must be performed as soon they arrive
	 * because they can be embedded inside a control sequence, and
	 * they must not cause conflicts with sequences.
	 */
	if (control) {
		tcontrolcode(u);
		/*
		 * control codes are not shown ever
		 */
		return;
	} else if (term.esc & ESC_START) {
		if (term.esc & ESC_CSI) {
			csiescseq.buf[csiescseq.len++] = u;
			if (BETWEEN(u, 0x40, 0x7E)
					|| csiescseq.len >= \
					sizeof(csiescseq.buf)-1) {
				term.esc = 0;
				csiparse();
				csihandle();
			}
			return;
		} else if (term.esc & ESC_UTF8) {
			tdefutf8(u);
		} else if (term.esc & ESC_ALTCHARSET) {
			tdeftran(u);
		} else if (term.esc & ESC_TEST) {
			tdectest(u);
		} else {
			if (!eschandle(u))
				return;
			// sequence already finished
		}
		term.esc = 0;
		/*
		 * All characters which form part of a sequence are not
		 * printed
		 */
		return;
	}
	if (sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
		selclear();

	gp = &term.line[term.c.y][term.c.x];
	if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
		gp->mode |= ATTR_WRAP;
		tnewline(1);
		gp = &term.line[term.c.y][term.c.x];
	}

	if (IS_SET(MODE_INSERT) && term.c.x+width < term.col)
		memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));

	if (term.c.x+width > term.col) {
		tnewline(1);
		gp = &term.line[term.c.y][term.c.x];
	}

	tsetchar(u, &term.c.attr, term.c.x, term.c.y);

	if (width == 2) {
		gp->mode |= ATTR_WIDE;
		if (term.c.x+1 < term.col) {
			gp[1].u = '\0';
			gp[1].mode = ATTR_WDUMMY;
		}
	}
	if (term.c.x+width < term.col) {
		tmoveto(term.c.x+width, term.c.y);
	} else {
		term.c.state |= CURSOR_WRAPNEXT;
	}
}

int
twrite(const char *buf, int buflen, int show_ctrl)
{
	int charsize;
	Rune u;
	int n;

	for (n = 0; n < buflen; n += charsize) {
		if (IS_SET(MODE_UTF8) && !IS_SET(MODE_SIXEL)) {
			// process a complete utf8 char
			charsize = utf8decode(buf + n, &u, buflen - n);
			if (charsize == 0)
				break;
		} else {
			u = buf[n] & 0xFF;
			charsize = 1;
		}
		if (show_ctrl && ISCONTROL(u)) {
			if (u & 0x80) {
				u &= 0x7f;
				tputc('^');
				tputc('[');
			} else if (u != '\n' && u != '\r' && u != '\t') {
				u ^= 0x40;
				tputc('^');
			}
		}
		tputc(u);
	}
	return n;
}

void
tresize(int col, int row)
{
	int i, j;
	int minrow = MIN(row, term.row);
	int mincol = MIN(col, term.col);
	int *bp;
	TCursor c;

	if (col < 1 || row < 1) {
		fprintf(stderr,
		        "tresize: error resizing to %dx%d\n", col, row);
		return;
	}

	/*
	 * slide screen to keep cursor where we expect it -
	 * tscrollup would work here, but we can optimize to
	 * memmove because we're freeing the earlier lines
	 */
	for (i = 0; i <= term.c.y - row; i++) {
		free(term.line[i]);
		free(term.alt[i]);
	}
	// ensure that both src and dst are not NULL
	if (i > 0) {
		memmove(term.line, term.line + i, row * sizeof(Line));
		memmove(term.alt, term.alt + i, row * sizeof(Line));
	}
	for (i += row; i < term.row; i++) {
		free(term.line[i]);
		free(term.alt[i]);
	}

	// resize to new height
	term.line = xrealloc(term.line, row * sizeof(Line));
	term.alt  = xrealloc(term.alt,  row * sizeof(Line));
	term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
	term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));

	for (i = 0; i < HISTSIZE; i++) {
		term.hist[i] = xrealloc(term.hist[i], col * sizeof(Glyph));
		for (j = mincol; j < col; j++) {
			term.hist[i][j] = term.c.attr;
			term.hist[i][j].u = ' ';
		}
	}

	// resize each r w to new width, zero-pad if needed
	for (i = 0; i < minrow; i++) {
		term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
		term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
	}

	// allocate any new rows
	for (/* i = minrow */; i < row; i++) {
		term.line[i] = xmalloc(col * sizeof(Glyph));
		term.alt[i] = xmalloc(col * sizeof(Glyph));
	}
	if (col > term.col) {
		bp = term.tabs + term.col;

		memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
		while (--bp > term.tabs && !*bp)
			/* nothing */ ;
		for (bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
			*bp = 1;
	}
	// update terminal size
	term.col = col;
	term.row = row;
	// reset scrolling region
	tsetscroll(0, row-1);
	// make use of the LIMIT in tmoveto
	tmoveto(term.c.x, term.c.y);
	// Clearing both screens (it makes dirty all lines)
	c = term.c;
	for (i = 0; i < 2; i++) {
		if (mincol < col && 0 < minrow) {
			tclearregion(mincol, 0, col - 1, minrow - 1);
		}
		if (0 < col && minrow < row) {
			tclearregion(0, minrow, col - 1, row - 1);
		}
		tswapscreen();
		tcursor(CURSOR_LOAD);
	}
	term.c = c;
}

void
resettitle(void)
{
	xsettitle(NULL);
}

void
drawregion(int x1, int y1, int x2, int y2)
{
	int y;
	for (y = y1; y < y2; y++) {
		if (!term.dirty[y])
			continue;

		term.dirty[y] = 0;
		xdrawline(TLINE(y), x1, y, x2);
	}
}

void
draw(void)
{
	int cx = term.c.x;

	if (!xstartdraw())
		return;

	// adjust cursor position
	LIMIT(term.ocx, 0, term.col-1);
	LIMIT(term.ocy, 0, term.row-1);
	if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY)
		term.ocx--;
	if (term.line[term.c.y][cx].mode & ATTR_WDUMMY)
		cx--;

	drawregion(0, 0, term.col, term.row);
	if (term.scr == 0) {
		xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
				term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
	}
	term.ocx = cx, term.ocy = term.c.y;
	xfinishdraw();
}

void
redraw(void)
{
	tfulldirt();
	draw();
}

// vim: filetype=c