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 ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == 0x7f)
#define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
#define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
#define ISDELIM(u) (u && wcschr(worddelimiters, u))

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,
};

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,				/* DCS, 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,
};

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 */
	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;
	Rune lastc;					/* last printed char outside of sequence, 0 if control */
} Term;

/* CSI Escape sequence structs */
/* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
typedef struct
{
	char buf[ESC_BUF_SIZ];		/* raw string */
	size_t 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;					/* allocated raw string */
	size_t siz;					/* allocation size */
	size_t 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 tsetattr(const int *, int);
static void tsetchar(Rune, const Glyph *, int, int);
static void tsetdirt(int, int);
static void tsetscroll(int, int);
static void tswapscreen(void);
static void tsetmode(int, int, const 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(const 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 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 const uchar utfbyte[UTF_SIZ + 1] = { 0x80, 0, 0xC0, 0xE0, 0xF0 };
static const uchar utfmask[UTF_SIZ + 1] = { 0xC0, 0x80, 0xE0, 0xF0, 0xF8 };
static const Rune utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000 };
static const 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;

	if (!(p = malloc(len)))
		die("malloc: %s\n", strerror(errno));

	return p;
}

void *xrealloc(void *p, size_t len)
{
	if ((p = realloc(p, len)) == NULL)
		die("realloc: %s\n", strerror(errno));

	return p;
}

char *xstrdup(const char *s)
{
	char *p;
	if ((p = strdup(s)) == NULL)
		die("strdup: %s\n", strerror(errno));

	return p;
}

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]);
}

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 ? *((*src)++) : '=';	/* emulate padding if string ends */
}

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)];

		/* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */
		if (a == -1 || b == -1)
			break;

		*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 (term.line[y][i - 1].mode & ATTR_WRAP)
		return i;

	while (i > 0 && term.line[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.alt = IS_SET(MODE_ALTSCREEN);
	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.oe.x = col;
	sel.oe.y = row;
	selnormalize();
	sel.type = type;

	if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY)
		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;
	const 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 = &term.line[*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 (!(term.line[yt][xt].mode & ATTR_WRAP))
					break;
			}

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

			gp = &term.line[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 (!(term.line[*y - 1][term.col - 1].mode & ATTR_WRAP))
				{
					break;
				}
			}
		}
		else if (direction > 0)
		{
			for (; *y < term.row - 1; *y += direction)
			{
				if (!(term.line[*y][term.col - 1].mode & ATTR_WRAP))
				{
					break;
				}
			}
		}
		break;
	}
}

char *getsel(void)
{
	char *str, *ptr;
	int y, bufsize, lastx, linelen;
	const 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 = &term.line[y][sel.nb.x];
			lastx = sel.ne.x;
		}
		else
		{
			gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
			lastx = (sel.ne.y == y) ? sel.ne.x : term.col - 1;
		}
		last = &term.line[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) || sel.type == SEL_RECTANGULAR))
			*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, *arg;
	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];
		arg = NULL;
	}
	else if (scroll)
	{
		prog = scroll;
		arg = utmp ? utmp : sh;
	}
	else if (utmp)
	{
		prog = utmp;
		arg = NULL;
	}
	else
	{
		prog = sh;
		arg = NULL;
	}
	DEFAULT(args, ((char *[])
				   { prog, arg, 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(const char *line, char *cmd, const 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 '%s' failed: %s\n", line, 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: %s\n", strerror(errno));
		break;
	case 0:
		close(iofd);
		close(m);
		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));
		if (s > 2)
			close(s);
#ifdef __OpenBSD__
		if (pledge("stdio getpw proc exec", NULL) == -1)
			die("pledge\n");
#endif
		execsh(cmd, args);
		break;
	default:
#ifdef __OpenBSD__
		if (pledge("stdio rpath tty proc", NULL) == -1)
			die("pledge\n");
#endif
		close(s);
		cmdfd = m;
		signal(SIGCHLD, sigchld);
		break;
	}
	return cmdfd;
}

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

	/* append read bytes to unprocessed bytes */
	ret = read(cmdfd, buf + buflen, LEN(buf) - buflen);

	switch (ret)
	{
	case 0:
		exit(0);
	case -1:
		die("couldn't read from shell: %s\n", strerror(errno));
	default:
		buflen += ret;
		written = twrite(buf, buflen, 0);
		buflen -= written;
		/* keep any incomplete UTF-8 byte sequence for the next call */
		if (buflen > 0)
			memmove(buf, buf + written, buflen);
		return ret;
	}
}

void ttywrite(const char *s, size_t n, int may_echo)
{
	const char *next;

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

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

	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 i;
	Line temp;

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

	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.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot))
	{
		selclear();
	}
	else if (BETWEEN(sel.nb.y, orig, term.bot))
	{
		sel.ob.y += n;
		sel.oe.y += n;
		if (sel.ob.y < term.top || sel.ob.y > term.bot ||
			sel.oe.y < term.top || sel.oe.y > term.bot)
		{
			selclear();
		}
		else
		{
			selnormalize();
		}
	}
}

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

	if (y == term.bot)
	{
		tscrollup(term.top, 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, const Glyph * attr, int x, int y)
{
	static const 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;

	if (isboxdraw(u))
		term.line[y][x].mode |= ATTR_BOXDRAW;
}

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);
}

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

int32_t tdefcolor(const 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(const 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, const int *args, int narg)
{
	int alt;
	const int *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. */
				break;
			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 'b':					/* REP -- if last char is printable print it <n> more times */
		DEFAULT(csiescseq.arg[0], 1);
		if (term.lastc)
			while (csiescseq.arg[0]-- > 0)
				tputc(term.lastc);
		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]);
		break;
	case 'T':					/* SD -- Scroll <n> line down */
		DEFAULT(csiescseq.arg[0], 1);
		tscrolldown(term.top, csiescseq.arg[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)
{
	size_t 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, *dec;
	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:
			if (narg > 1)
			{
				xsettitle(strescseq.args[1]);
				xseticontitle(strescseq.args[1]);
			}
			return;
		case 1:
			if (narg > 1)
				xseticontitle(strescseq.args[1]);
			return;
		case 2:
			if (narg > 1)
				xsettitle(strescseq.args[1]);
			return;
		case 52:
			if (narg > 2 && allowwindowops)
			{
				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))
			{
				if (par == 104 && narg <= 1)
					return;		/* color reset without parameter */
				fprintf(stderr, "erresc: invalid color j=%d, p=%s\n", j, p ? p : "(null)");
			}
			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 */
	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 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 strdump(void)
{
	size_t 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)
{
	strescseq = (STREscape)
	{
	.buf = xrealloc(strescseq.buf, STR_BUF_SIZ),.siz = STR_BUF_SIZ,};
}

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 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];
	const 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)
{
	switch (c)
	{
	case 0x90:					/* DCS -- Device Control String */
		c = 'P';
		break;
	case 0x9f:					/* APC -- Application Program Command */
		c = '_';
		break;
	case 0x9e:					/* PM -- Privacy Message */
		c = '^';
		break;
	case 0x9d:					/* OSC -- Operating System Command */
		c = ']';
		break;
	}
	strreset();
	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);
		/* FALLTHROUGH */
	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);
		}
		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);
		}
		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 (u < 127 || !IS_SET(MODE_UTF8))
	{
		c[0] = u;
		width = len = 1;
	}
	else
	{
		len = utf8encode(u, c);
		if (!control && (width = wcwidth(u)) == -1)
			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);
			term.esc |= ESC_STR_END;
			goto check_control_code;
		}

		if (strescseq.len + len >= strescseq.siz)
		{
			/* 
			 * 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();
			 */
			if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
				return;
			strescseq.siz *= 2;
			strescseq.buf = xrealloc(strescseq.buf, strescseq.siz);
		}

		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
		 */
		if (!term.esc)
			term.lastc = 0;
		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 (selected(term.c.x, term.c.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);
	term.lastc = u;

	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))
		{
			/* 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;
	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));

	/* resize each row 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(term.line[y], x1, y, x2);
	}
}

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

	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);
	xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
				term.ocx, term.ocy, term.line[term.ocy][term.ocx], term.line[term.ocy], term.col);
	term.ocx = cx;
	term.ocy = term.c.y;
	xfinishdraw();
	if (ocx != term.ocx || ocy != term.ocy)
		xximspot(term.ocx, term.ocy);
}

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