st.c

/* See LICENSE for license details. */
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
/* for BTN_* definitions */
#include <linux/input.h>
#include <locale.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <libgen.h>
#include <wayland-client.h>
#include <wayland-cursor.h>
#include <xkbcommon/xkbcommon.h>
#include <wld/wld.h>
#include <wld/wayland.h>
#include <fontconfig/fontconfig.h>
#include <wchar.h>

#include "arg.h"
#include "xdg-shell-unstable-v5-client-protocol.h"
#include "base64dec.c"
char *argv0;

#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
#define DRAW_BUF_SIZ  20*1024
#define XK_ANY_MOD    UINT_MAX
#define XK_NO_MOD     0
#define XK_SWITCH_MOD (1<<13)

#define MOD_MASK_ANY	UINT_MAX
#define MOD_MASK_NONE	0
#define MOD_MASK_CTRL	(1<<0)
#define MOD_MASK_ALT	(1<<1)
#define MOD_MASK_SHIFT	(1<<2)
#define MOD_MASK_LOGO	(1<<3)

#define AXIS_VERTICAL	WL_POINTER_AXIS_VERTICAL_SCROLL
#define AXIS_HORIZONTAL	WL_POINTER_AXIS_HORIZONTAL_SCROLL

/* macros */
#define MIN(a, b)		((a) < (b) ? (a) : (b))
#define MAX(a, b)		((a) < (b) ? (b) : (a))
#define LEN(a)			(sizeof(a) / sizeof(a)[0])
#define DEFAULT(a, b)		(a) = (a) ? (a) : (b)
#define BETWEEN(x, a, b)	((a) <= (x) && (x) <= (b))
#define DIVCEIL(n, d)		(((n) + ((d) - 1)) / (d))
#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)
#define LIMIT(x, a, b)		(x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
#define ATTRCMP(a, b)		((a).mode != (b).mode || (a).fg != (b).fg || \
				(a).bg != (b).bg)
#define IS_SET(flag)		((term.mode & (flag)) != 0)
#define TIMEDIFF(t1, t2)	((t1.tv_sec-t2.tv_sec)*1000 + \
				(t1.tv_nsec-t2.tv_nsec)/1E6)
#define MODBIT(x, set, bit)	((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))

#define TRUECOLOR(r,g,b)	(1 << 24 | (r) << 16 | (g) << 8 | (b))
#define IS_TRUECOL(x)		(1 << 24 & (x))
#define TRUERED(x)		(((x) & 0xff0000) >> 8)
#define TRUEGREEN(x)		(((x) & 0xff00))
#define TRUEBLUE(x)		(((x) & 0xff) << 8)

/* constants */
#define ISO14755CMD		"dmenu -p codepoint: </dev/null"

enum glyph_attribute {
	ATTR_NULL       = 0,
	ATTR_BOLD       = 1 << 0,
	ATTR_FAINT      = 1 << 1,
	ATTR_ITALIC     = 1 << 2,
	ATTR_UNDERLINE  = 1 << 3,
	ATTR_BLINK      = 1 << 4,
	ATTR_REVERSE    = 1 << 5,
	ATTR_INVISIBLE  = 1 << 6,
	ATTR_STRUCK     = 1 << 7,
	ATTR_WRAP       = 1 << 8,
	ATTR_WIDE       = 1 << 9,
	ATTR_WDUMMY     = 1 << 10,
	ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
};

enum cursor_movement {
	CURSOR_SAVE,
	CURSOR_LOAD
};

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

enum term_mode {
	MODE_WRAP        = 1 << 0,
	MODE_INSERT      = 1 << 1,
	MODE_APPKEYPAD   = 1 << 2,
	MODE_ALTSCREEN   = 1 << 3,
	MODE_CRLF        = 1 << 4,
	MODE_MOUSEBTN    = 1 << 5,
	MODE_MOUSEMOTION = 1 << 6,
	MODE_REVERSE     = 1 << 7,
	MODE_KBDLOCK     = 1 << 8,
	MODE_HIDE        = 1 << 9,
	MODE_ECHO        = 1 << 10,
	MODE_APPCURSOR   = 1 << 11,
	MODE_MOUSESGR    = 1 << 12,
	MODE_8BIT        = 1 << 13,
	MODE_BLINK       = 1 << 14,
	MODE_FBLINK      = 1 << 15,
	MODE_FOCUS       = 1 << 16,
	MODE_MOUSEX10    = 1 << 17,
	MODE_MOUSEMANY   = 1 << 18,
	MODE_BRCKTPASTE  = 1 << 19,
	MODE_PRINT       = 1 << 20,
	MODE_UTF8        = 1 << 21,
	MODE_SIXEL       = 1 << 22,
	MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
	                  |MODE_MOUSEMANY,
};

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,
};

enum window_state {
	WIN_VISIBLE = 1,
	WIN_FOCUSED = 2
};

enum selection_mode {
	SEL_IDLE = 0,
	SEL_EMPTY = 1,
	SEL_READY = 2
};

enum selection_type {
	SEL_REGULAR = 1,
	SEL_RECTANGULAR = 2
};

enum selection_snap {
	SNAP_WORD = 1,
	SNAP_LINE = 2
};

typedef unsigned char uchar;
typedef unsigned int uint;
typedef unsigned long ulong;
typedef unsigned short ushort;

typedef uint_least32_t Rune;

typedef struct {
	Rune u;           /* character code */
	ushort mode;      /* attribute flags */
	uint32_t fg;      /* foreground  */
	uint32_t bg;      /* background  */
} Glyph;

typedef Glyph *Line;

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

/* 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;

/* 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 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 numlock; /* lock numbers in keyboard */
	int *tabs;
} Term;

typedef struct {
	struct xkb_context *ctx;
	struct xkb_keymap *keymap;
	struct xkb_state *state;
	xkb_mod_index_t ctrl, alt, shift, logo;
	unsigned int mods;
} XKB;

typedef struct {
	struct wl_display *dpy;
	struct wl_compositor *cmp;
	struct wl_shm *shm;
	struct wl_seat *seat;
	struct wl_keyboard *keyboard;
	struct wl_pointer *pointer;
	struct wl_data_device_manager *datadevmanager;
	struct wl_data_device *datadev;
	struct wl_data_offer *seloffer;
	struct wl_surface *surface;
	struct wl_buffer *buffer;
	struct xdg_shell *shell;
	struct xdg_surface *xdgsurface;
	XKB xkb;
	bool configured;
	int px, py; /* pointer x and y */
	int tw, th; /* tty width and height */
	int w, h; /* window width and height */
	int ch; /* char height */
	int cw; /* char width  */
	int vis;
	char state; /* focus, redraw, visible */
	int cursor; /* cursor style */
	struct wl_callback * framecb;
	uint32_t globalserial; /* global event serial */
} Wayland;

typedef struct {
	struct wld_context *ctx;
	struct wld_font_context *fontctx;
	struct wld_renderer *renderer;
	struct wld_buffer *buffer, *oldbuffer;
} WLD;

typedef struct {
	struct wl_cursor_theme *theme;
	struct wl_cursor *cursor;
	struct wl_surface *surface;
} Cursor;

typedef struct {
	uint b;
	uint mask;
	char *s;
} MouseShortcut;

typedef struct {
	int axis;
	int dir;
	uint mask;
	char s[ESC_BUF_SIZ];
} Axiskey;

typedef struct {
	xkb_keysym_t k;
	uint mask;
	char *s;
	/* three valued logic variables: 0 indifferent, 1 on, -1 off */
	signed char appkey;    /* application keypad */
	signed char appcursor; /* application cursor */
	signed char crlf;      /* crlf mode          */
} Key;

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;

	char *primary;
	struct wl_data_source *source;
	int alt;
	uint32_t tclick1, tclick2;
} Selection;

typedef union {
	int i;
	uint ui;
	float f;
	const void *v;
} Arg;

typedef struct {
	uint mod;
	xkb_keysym_t keysym;
	void (*func)(const Arg *);
	const Arg arg;
} Shortcut;

typedef struct {
	char str[32];
	uint32_t key;
	int len;
	bool started;
	struct timespec last;
} Repeat;

/* function definitions used in config.h */
static void numlock(const Arg *);
static void selpaste(const Arg *);
static void wlzoom(const Arg *);
static void wlzoomabs(const Arg *);
static void wlzoomreset(const Arg *);
static void printsel(const Arg *);
static void printscreen(const Arg *) ;
static void iso14755(const Arg *);
static void toggleprinter(const Arg *);
static void sendbreak(const Arg *);

/* Config.h for applying patches and the configuration. */
#include "config.h"

/* Font structure */
typedef struct {
	int height;
	int width;
	int ascent;
	int descent;
	int badslant;
	int badweight;
	short lbearing;
	short rbearing;
	struct wld_font *match;
	FcFontSet *set;
	FcPattern *pattern;
} Font;

/* Drawing Context */
typedef struct {
	uint32_t col[MAX(LEN(colorname), 256)];
	Font font, bfont, ifont, ibfont;
} DC;

static void die(const char *, ...);
static void draw(void);
static void redraw(void);
static void drawregion(int, int, int, int);
static void execsh(void);
static void stty(void);
static void sigchld(int);
static void run(void);
static void cresize(int, int);

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 int tattrset(int);
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 tnew(int, int);
static void tnewline(int);
static void tputtab(int);
static void tputc(Rune);
static void treset(void);
static void tresize(int, int);
static void tscrollup(int, int);
static void tscrolldown(int, int);
static void tsetattr(int *, int);
static void tsetchar(Rune, Glyph *, int, int);
static void tsetscroll(int, int);
static void tswapscreen(void);
static void tsetdirt(int, int);
static void tsetdirtattr(int);
static void tsetmode(int, int, int *, int);
static void tfulldirt(void);
static void techo(Rune);
static void tcontrolcode(uchar );
static void tdectest(char );
static void tdefutf8(char);
static int32_t tdefcolor(int *, int *, int);
static void tdeftran(char);
static inline int match(uint, uint);
static void ttynew(void);
static size_t ttyread(void);
static void ttyresize(void);
static void ttysend(char *, size_t);
static void ttywrite(const char *, size_t);
static void tstrsequence(uchar);

static inline uchar sixd_to_8bit(int);
static void wldraws(char *, Glyph, int, int, int, int);
static void wldrawglyph(Glyph, int, int);
static void wlclear(int, int, int, int);
static void wldrawcursor(void);
static void wlinit(void);
static void wlloadcols(void);
static int wlsetcolorname(int, const char *);
static void wlloadcursor(void);
static int wlloadfont(Font *, FcPattern *);
static void wlloadfonts(char *, double);
static void wlsettitle(char *);
static void wlresettitle(void);
static void wlseturgency(int);
static void wlsetsel(char*, uint32_t);
static void wlunloadfont(Font *f);
static void wlunloadfonts(void);
static void wlresize(int, int);

static void regglobal(void *, struct wl_registry *, uint32_t, const char *,
		uint32_t);
static void regglobalremove(void *, struct wl_registry *, uint32_t);
static void surfenter(void *, struct wl_surface *, struct wl_output *);
static void surfleave(void *, struct wl_surface *, struct wl_output *);
static void framedone(void *, struct wl_callback *, uint32_t);
static void kbdkeymap(void *, struct wl_keyboard *, uint32_t, int32_t, uint32_t);
static void kbdenter(void *, struct wl_keyboard *, uint32_t,
		struct wl_surface *, struct wl_array *);
static void kbdleave(void *, struct wl_keyboard *, uint32_t,
		struct wl_surface *);
static void kbdkey(void *, struct wl_keyboard *, uint32_t, uint32_t, uint32_t,
		uint32_t);
static void kbdmodifiers(void *, struct wl_keyboard *, uint32_t, uint32_t,
		uint32_t, uint32_t, uint32_t);
static void kbdrepeatinfo(void *, struct wl_keyboard *, int32_t, int32_t);
static void ptrenter(void *, struct wl_pointer *, uint32_t, struct wl_surface *,
		wl_fixed_t, wl_fixed_t);
static void ptrleave(void *, struct wl_pointer *, uint32_t,
		struct wl_surface *);
static void ptrmotion(void *, struct wl_pointer *, uint32_t,
		wl_fixed_t, wl_fixed_t);
static void ptrbutton(void *, struct wl_pointer *, uint32_t, uint32_t,
		uint32_t, uint32_t);
static void ptraxis(void *, struct wl_pointer *, uint32_t, uint32_t,
		wl_fixed_t);
static void xdgshellping(void *, struct xdg_shell *, uint32_t);
static void xdgsurfconfigure(void *, struct xdg_surface *,
		int32_t, int32_t, struct wl_array *, uint32_t);
static void xdgsurfclose(void *, struct xdg_surface *);
static void datadevoffer(void *, struct wl_data_device *,
		struct wl_data_offer *);
static void datadeventer(void *, struct wl_data_device *, uint32_t,
		struct wl_surface *, wl_fixed_t, wl_fixed_t, struct wl_data_offer *);
static void datadevleave(void *, struct wl_data_device *);
static void datadevmotion(void *, struct wl_data_device *, uint32_t,
		wl_fixed_t x, wl_fixed_t y);
static void datadevdrop(void *, struct wl_data_device *);
static void datadevselection(void *, struct wl_data_device *,
		struct wl_data_offer *);
static void dataofferoffer(void *, struct wl_data_offer *, const char *);
static void datasrctarget(void *, struct wl_data_source *, const char *);
static void datasrcsend(void *, struct wl_data_source *, const char *, int32_t);
static void datasrccancelled(void *, struct wl_data_source *);

static void selinit(void);
static void selnormalize(void);
static inline int selected(int, int);
static char *getsel(void);
static void selcopy(uint32_t);
static void selscroll(int, int);
static void selsnap(int *, int *, int);
static int x2col(int);
static int y2row(int);

static size_t utf8decode(char *, Rune *, size_t);
static Rune utf8decodebyte(char, size_t *);
static size_t utf8encode(Rune, char *);
static char utf8encodebyte(Rune, size_t);
static char *utf8strchr(char *s, Rune u);
static size_t utf8validate(Rune *, size_t);

static ssize_t xwrite(int, const char *, size_t);
static void *xmalloc(size_t);
static void *xrealloc(void *, size_t);
static char *xstrdup(char *);

static void usage(void);

static struct wl_registry_listener reglistener = { regglobal, regglobalremove };
static struct wl_surface_listener surflistener = { surfenter, surfleave };
static struct wl_callback_listener framelistener = { framedone };
static struct wl_keyboard_listener kbdlistener =
	{ kbdkeymap, kbdenter, kbdleave, kbdkey, kbdmodifiers, kbdrepeatinfo };
static struct wl_pointer_listener ptrlistener =
	{ ptrenter, ptrleave, ptrmotion, ptrbutton, ptraxis };
static struct xdg_shell_listener xdgshelllistener = { xdgshellping };
static struct xdg_surface_listener xdgsurflistener =
	{ xdgsurfconfigure, xdgsurfclose };
static struct wl_data_device_listener datadevlistener =
	{ datadevoffer, datadeventer, datadevleave, datadevmotion, datadevdrop,
	  datadevselection };
static struct wl_data_offer_listener dataofferlistener = { dataofferoffer };
static struct wl_data_source_listener datasrclistener =
	{ datasrctarget, datasrcsend, datasrccancelled };

/* Globals */
static DC dc;
static Wayland wl;
static WLD wld;
static Cursor cursor;
static Term term;
static CSIEscape csiescseq;
static STREscape strescseq;
static int cmdfd;
static pid_t pid;
static Selection sel;
static Repeat repeat;
static bool needdraw = true;
static int iofd = 1;
static char **opt_cmd  = NULL;
static char *opt_class = NULL;
static char *opt_embed = NULL;
static char *opt_font  = NULL;
static char *opt_io    = NULL;
static char *opt_line  = NULL;
static char *opt_name  = NULL;
static char *opt_title = NULL;
static int oldbutton   = 3; /* button event on startup: 3 = release */
static int oldx, oldy;

static char *usedfont = NULL;
static double usedfontsize = 0;
static double defaultfontsize = 0;

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};

/* Font Ring Cache */
enum {
	FRC_NORMAL,
	FRC_ITALIC,
	FRC_BOLD,
	FRC_ITALICBOLD
};

typedef struct {
	struct wld_font *font;
	int flags;
	Rune unicodep;
} Fontcache;

/* Fontcache is an array now. A new font will be appended to the array. */
static Fontcache frc[16];
static int frclen = 0;

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(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;
}

void
selinit(void)
{
	sel.tclick1 = 0;
	sel.tclick2 = 0;
	sel.mode = SEL_IDLE;
	sel.snap = 0;
	sel.ob.x = -1;
	sel.primary = NULL;
	sel.source = NULL;
}

int
x2col(int x)
{
	x -= borderpx;
	x /= wl.cw;

	return LIMIT(x, 0, term.col-1);
}

int
y2row(int y)
{
	y -= borderpx;
	y /= wl.ch;

	return LIMIT(y, 0, term.row-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
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)
		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 = &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;
	}
}

void
getbuttoninfo(void)
{
	int type;
	uint state = wl.xkb.mods & ~forceselmod;

	sel.alt = IS_SET(MODE_ALTSCREEN);

	sel.oe.x = x2col(wl.px);
	sel.oe.y = y2row(wl.py);
	selnormalize();

	sel.type = SEL_REGULAR;
	for (type = 1; type < LEN(selmasks); ++type) {
		if (match(selmasks[type], state)) {
			sel.type = type;
			break;
		}
	}
}

void
wlmousereport(int button, bool release, int x, int y)
{
	int len;
	char buf[40];

	if (!IS_SET(MODE_MOUSEX10)) {
		button += ((wl.xkb.mods & MOD_MASK_SHIFT) ? 4  : 0)
			+ ((wl.xkb.mods & MOD_MASK_LOGO ) ? 8  : 0)
			+ ((wl.xkb.mods & MOD_MASK_CTRL ) ? 16 : 0);
	}

	if (IS_SET(MODE_MOUSESGR)) {
		len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
				button, x+1, y+1, release ? 'm' : 'M');
	} else if (x < 223 && y < 223) {
		len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
				32+button, 32+x+1, 32+y+1);
	} else {
		return;
	}

	ttywrite(buf, len);
}

void
wlmousereportbutton(uint32_t button, uint32_t state)
{
	bool release = state == WL_POINTER_BUTTON_STATE_RELEASED;

	if (!IS_SET(MODE_MOUSESGR) && release) {
		button = 3;
	} else {
		switch (button) {
		case BTN_LEFT:
			button = 0;
			break;
		case BTN_MIDDLE:
			button = 1;
			break;
		case BTN_RIGHT:
			button = 2;
			break;
		}
	}

	oldbutton = release ? 3 : button;

	/* don't report release events when in X10 mode */
	if (IS_SET(MODE_MOUSEX10) && release) {
		return;
	}

	wlmousereport(button, release, oldx, oldy);
}

void
wlmousereportmotion(wl_fixed_t fx, wl_fixed_t fy)
{
	int x = x2col(wl_fixed_to_int(fx)), y = y2row(wl_fixed_to_int(fy));

	if (x == oldx && y == oldy)
		return;
	if (!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
		return;
	/* MOUSE_MOTION: no reporting if no button is pressed */
	if (IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
		return;

	oldx = x;
	oldy = y;
	wlmousereport(oldbutton + 32, false, x, y);
}

void
wlmousereportaxis(uint32_t axis, wl_fixed_t amount)
{
	wlmousereport(64 + (axis == AXIS_VERTICAL ? 4 : 6)
		+ (amount > 0 ? 1 : 0), false, oldx, oldy);
}

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 = &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))
			*ptr++ = '\n';
	}
	*ptr = 0;
	return str;
}

void
selcopy(uint32_t serial)
{
	wlsetsel(getsel(), serial);
}

static inline void
selwritebuf(char *buf, int len)
{
	char *repl = buf;

	/*
	 * As seen in getsel:
	 * Line endings are inconsistent in the terminal and GUI world
	 * copy and pasting. When receiving some selection data,
	 * replace all '\n' with '\r'.
	 * FIXME: Fix the computer world.
	 */
	while ((repl = memchr(repl, '\n', len))) {
		*repl++ = '\r';
	}

	ttysend(buf, len);
}

void
selpaste(const Arg *dummy)
{
	int fds[2], len, left;
	char buf[BUFSIZ], *str;

	if (wl.seloffer) {
		if (IS_SET(MODE_BRCKTPASTE))
			ttywrite("\033[200~", 6);
		/* check if we are pasting from ourselves */
		if (sel.source) {
			str = sel.primary;
			left = strlen(sel.primary);
			while (left > 0) {
				len = MIN(sizeof buf, left);
				memcpy(buf, str, len);
				selwritebuf(buf, len);
				left -= len;
				str += len;
			}
		} else {
			pipe(fds);
			wl_data_offer_receive(wl.seloffer, "text/plain", fds[1]);
			wl_display_flush(wl.dpy);
			close(fds[1]);
			while ((len = read(fds[0], buf, sizeof buf)) > 0) {
				selwritebuf(buf, len);
			}
			close(fds[0]);
		}
		if (IS_SET(MODE_BRCKTPASTE))
			ttywrite("\033[201~", 6);
	}
}

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
wlsetsel(char *str, uint32_t serial)
{
	free(sel.primary);
	sel.primary = str;

	if (str) {
		sel.source = wl_data_device_manager_create_data_source(wl.datadevmanager);
		wl_data_source_add_listener(sel.source, &datasrclistener, NULL);
		wl_data_source_offer(sel.source, "text/plain; charset=utf-8");
	} else {
		sel.source = NULL;
	}
	wl_data_device_set_selection(wl.datadev, sel.source, serial);
}

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

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

void
execsh(void)
{
	char **args, *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 : shell;

	if (opt_cmd)
		prog = opt_cmd[0];
	else if (utmp)
		prog = utmp;
	else
		prog = sh;
	args = (opt_cmd) ? opt_cmd : (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 finished with error '%d'\n", stat);
	exit(0);
}


void
stty(void)
{
	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 = opt_cmd; 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");
}

void
ttynew(void)
{
	int m, s;
	struct winsize w = {term.row, term.col, 0, 0};

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

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

	/* seems to work fine on linux, openbsd and freebsd */
	if (openpty(&m, &s, NULL, NULL, &w) < 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();
		break;
	default:
		close(s);
		cmdfd = m;
		signal(SIGCHLD, sigchld);
		break;
	}
}

size_t
ttyread(void)
{
	static char buf[BUFSIZ];
	static int buflen = 0;
	char *ptr;
	int charsize; /* size of utf8 char in bytes */
	Rune unicodep;
	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;
	ptr = buf;

	for (;;) {
		if (IS_SET(MODE_UTF8) && !IS_SET(MODE_SIXEL)) {
			/* process a complete utf8 char */
			charsize = utf8decode(ptr, &unicodep, buflen);
			if (charsize == 0)
				break;
			tputc(unicodep);
			ptr += charsize;
			buflen -= charsize;

		} else {
			if (buflen <= 0)
				break;
			tputc(*ptr++ & 0xFF);
			buflen--;
		}
	}
	/* keep any uncomplete utf8 char for the next call */
	if (buflen > 0)
		memmove(buf, ptr, buflen);

	needdraw = true;
	return ret;
}

void
ttywrite(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
ttysend(char *s, size_t n)
{
	int len;
	char *t, *lim;
	Rune u;

	ttywrite(s, n);
	if (!IS_SET(MODE_ECHO))
		return;

	lim = &s[n];
	for (t = s; t < lim; t += len) {
		if (IS_SET(MODE_UTF8) && !IS_SET(MODE_SIXEL)) {
			len = utf8decode(t, &u, n);
		} else {
			u = *t & 0xFF;
			len = 1;
		}
		if (len <= 0)
			break;
		techo(u);
		n -= len;
	}
}

void
ttyresize(void)
{
	struct winsize w;

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

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;

	needdraw = true;
}

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);
	term.numlock = 1;

	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.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);
	} 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);
}

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

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 *lim, mode;
	int alt;

	for (lim = args + narg; args < lim; ++args) {
		if (priv) {
			switch (*args) {
			case 1: /* DECCKM -- Cursor key */
				MODBIT(term.mode, set, MODE_APPCURSOR);
				break;
			case 5: /* DECSCNM -- Reverse video */
				mode = term.mode;
				MODBIT(term.mode, set, MODE_REVERSE);
				if (mode != term.mode)
					redraw();
				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 */
				MODBIT(term.mode, !set, MODE_HIDE);
				break;
			case 9:    /* X10 mouse compatibility mode */
				MODBIT(term.mode, 0, MODE_MOUSE);
				MODBIT(term.mode, set, MODE_MOUSEX10);
				break;
			case 1000: /* 1000: report button press */
				MODBIT(term.mode, 0, MODE_MOUSE);
				MODBIT(term.mode, set, MODE_MOUSEBTN);
				break;
			case 1002: /* 1002: report motion on button press */
				MODBIT(term.mode, 0, MODE_MOUSE);
				MODBIT(term.mode, set, MODE_MOUSEMOTION);
				break;
			case 1003: /* 1003: enable all mouse motions */
				MODBIT(term.mode, 0, MODE_MOUSE);
				MODBIT(term.mode, set, MODE_MOUSEMANY);
				break;
			case 1004: /* 1004: send focus events to tty */
				MODBIT(term.mode, set, MODE_FOCUS);
				break;
			case 1006: /* 1006: extended reporting mode */
				MODBIT(term.mode, set, MODE_MOUSESGR);
				break;
			case 1034:
				MODBIT(term.mode, 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 */
				MODBIT(term.mode, 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:  /* KAM -- keyboard action */
				MODBIT(term.mode, 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, sizeof(vtiden) - 1);
		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 */
		selclear();
		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);
		}
		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 */
			DEFAULT(csiescseq.arg[0], 1);
			if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
				goto unknown;
			}
			wl.cursor = csiescseq.arg[0];
			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)
				wlsettitle(strescseq.args[1]);
			return;
		case 52: /* tmux clipboard set */
			if (narg > 2) {
				char *src = strescseq.args[2];
				size_t l = (strlen(src)/4)*3;
				char *buf = xmalloc(l+1);
				base64dec(buf, src, l);
				wlsetsel(buf, wl.globalserial);
			}
			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 (wlsetcolorname(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 */
		wlsettitle(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) {
		fprintf(stderr, "Error writing in %s:%s\n",
			opt_io, strerror(errno));
		close(iofd);
		iofd = -1;
	}
}

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;

	ttysend(uc, utf8encode(utf32, uc));
}

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
techo(Rune u)
{
	if (ISCONTROL(u)) { /* control code */
		if (u & 0x80) {
			u &= 0x7f;
			tputc('^');
			tputc('[');
		} else if (u != '\n' && u != '\r' && u != '\t') {
			u ^= 0x40;
			tputc('^');
		}
	}
	tputc(u);
	needdraw = true;
}

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 {
			if (!(wl.state & WIN_FOCUSED))
				wlseturgency(1);
			/* XXX: No bell on wayland
			 * if (bellvolume)
			 *     XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
			 */
		}
		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, sizeof(vtiden) - 1);
		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, sizeof(vtiden) - 1);
		break;
	case 'c': /* RIS -- Reset to inital state */
		treset();
		wlresettitle();
		wlloadcols();
		break;
	case '=': /* DECPAM -- Application keypad */
		term.mode |= MODE_APPKEYPAD;
		break;
	case '>': /* DECPNM -- Normal keypad */
		term.mode &= ~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;
	}
}

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
wlresize(int col, int row)
{
	union wld_object object;

	wl.tw = MAX(1, col * wl.cw);
	wl.th = MAX(1, row * wl.ch);

	wld.oldbuffer = wld.buffer;
	wld.buffer = wld_create_buffer(wld.ctx, wl.w, wl.h,
			WLD_FORMAT_XRGB8888, 0);
	wld_export(wld.buffer, WLD_WAYLAND_OBJECT_BUFFER, &object);
	wl.buffer = object.ptr;
}

uchar
sixd_to_8bit(int x)
{
	return x == 0 ? 0 : 0x37 + 0x28 * x;
}

int
wlloadcolor(int i, const char *name, uint32_t *color)
{
	if (!name) {
		if (BETWEEN(i, 16, 255)) { /* 256 color */
			if (i < 6*6*6+16) { /* same colors as xterm */
				*color = 0xff << 24 | sixd_to_8bit(((i-16)/36)%6) << 16
					| sixd_to_8bit(((i-16)/6)%6) << 8
					| sixd_to_8bit(((i-16)/1)%6);
			} else { /* greyscale */
				*color = 0xff << 24 | (0x8 + 0xa * (i-(6*6*6+16))) * 0x10101;
			}
			return true;
		} else
			name = colorname[i];
	}

	return wld_lookup_named_color(name, color);
}

void
wlloadcols(void)
{
	int i;

	for (i = 0; i < LEN(dc.col); i++)
		if (!wlloadcolor(i, NULL, &dc.col[i])) {
			if (colorname[i])
				die("Could not allocate color '%s'\n", colorname[i]);
			else
				die("Could not allocate color %d\n", i);
		}
}

int
wlsetcolorname(int x, const char *name)
{
	uint32_t color;

	if (!BETWEEN(x, 0, LEN(dc.col)))
		return 1;

	if (!wlloadcolor(x, name, &color))
		return 1;

	dc.col[x] = color;

	return 0;
}

static void wlloadcursor(void)
{
	char *names[] = { mouseshape, "xterm", "ibeam", "text" };
	int i;

	cursor.theme = wl_cursor_theme_load(NULL, 32, wl.shm);

	for (i = 0; !cursor.cursor && i < LEN(names); i++)
		cursor.cursor = wl_cursor_theme_get_cursor(cursor.theme, names[i]);

	cursor.surface = wl_compositor_create_surface(wl.cmp);
}

/*
 * Absolute coordinates.
 */
void
wlclear(int x1, int y1, int x2, int y2)
{
	uint32_t color = dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg];

	wld_fill_rectangle(wld.renderer, color, x1, y1, x2 - x1, y2 - y1);
}

int
wlloadfont(Font *f, FcPattern *pattern)
{
	FcPattern *configured;
	FcPattern *match;
	FcResult result;
	struct wld_extents extents;
	int wantattr, haveattr;

	/*
	 * Manually configure instead of calling XftMatchFont
	 * so that we can use the configured pattern for
	 * "missing glyph" lookups.
	 */
	configured = FcPatternDuplicate(pattern);
	if (!configured)
		return 1;

	FcConfigSubstitute(NULL, configured, FcMatchPattern);
	FcDefaultSubstitute(configured);

	match = FcFontMatch(NULL, configured, &result);
	if (!match) {
		FcPatternDestroy(configured);
		return 1;
	}

	if (!(f->match = wld_font_open_pattern(wld.fontctx, match))) {
		FcPatternDestroy(configured);
		FcPatternDestroy(match);
		return 1;
	}

	if ((FcPatternGetInteger(pattern, "slant", 0, &wantattr) ==
	    FcResultMatch)) {
		/*
		 * Check if xft was unable to find a font with the appropriate
		 * slant but gave us one anyway. Try to mitigate.
		 */
		if ((FcPatternGetInteger(match, "slant", 0,
		    &haveattr) != FcResultMatch) || haveattr < wantattr) {
			f->badslant = 1;
			fputs("st: font slant does not match\n", stderr);
		}
	}

	if ((FcPatternGetInteger(pattern, "weight", 0, &wantattr) ==
	    FcResultMatch)) {
		if ((FcPatternGetInteger(match, "weight", 0,
		    &haveattr) != FcResultMatch) || haveattr != wantattr) {
			f->badweight = 1;
			fputs("st: font weight does not match\n", stderr);
		}
	}


	wld_font_text_extents(f->match, ascii_printable, &extents);

	f->set = NULL;
	f->pattern = configured;

	f->ascent = f->match->ascent;
	f->descent = f->match->descent;
	f->lbearing = 0;
	f->rbearing = f->match->max_advance;

	f->height = f->ascent + f->descent;
	f->width = DIVCEIL(extents.advance, strlen(ascii_printable));

	return 0;
}

void
wlloadfonts(char *fontstr, double fontsize)
{
	FcPattern *pattern;
	double fontval;
	float ceilf(float);

	if (fontstr[0] == '-') {
		/* XXX: need XftXlfdParse equivalent */
		pattern = NULL;
	} else {
		pattern = FcNameParse((FcChar8 *)fontstr);
	}

	if (!pattern)
		die("st: can't open font %s\n", fontstr);

	if (fontsize > 1) {
		FcPatternDel(pattern, FC_PIXEL_SIZE);
		FcPatternDel(pattern, FC_SIZE);
		FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
		usedfontsize = fontsize;
	} else {
		if (FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval) ==
				FcResultMatch) {
			usedfontsize = fontval;
		} else if (FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval) ==
				FcResultMatch) {
			usedfontsize = -1;
		} else {
			/*
			 * Default font size is 12, if none given. This is to
			 * have a known usedfontsize value.
			 */
			FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
			usedfontsize = 12;
		}
		defaultfontsize = usedfontsize;
	}

	FcConfigSubstitute(0, pattern, FcMatchPattern);
	FcDefaultSubstitute(pattern);

	if (wlloadfont(&dc.font, pattern))
		die("st: can't open font %s\n", fontstr);

	if (usedfontsize < 0) {
		FcPatternGetDouble(dc.font.pattern,
		                   FC_PIXEL_SIZE, 0, &fontval);
		usedfontsize = fontval;
		if (fontsize == 0)
			defaultfontsize = fontval;
	}

	/* Setting character width and height. */
	wl.cw = ceilf(dc.font.width * cwscale);
	wl.ch = ceilf(dc.font.height * chscale);

	FcPatternDel(pattern, FC_SLANT);
	FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
	if (wlloadfont(&dc.ifont, pattern))
		die("st: can't open font %s\n", fontstr);

	FcPatternDel(pattern, FC_WEIGHT);
	FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
	if (wlloadfont(&dc.ibfont, pattern))
		die("st: can't open font %s\n", fontstr);

	FcPatternDel(pattern, FC_SLANT);
	FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
	if (wlloadfont(&dc.bfont, pattern))
		die("st: can't open font %s\n", fontstr);

	FcPatternDestroy(pattern);
}

void
wlunloadfont(Font *f)
{
	wld_font_close(f->match);
	FcPatternDestroy(f->pattern);
	if (f->set)
		FcFontSetDestroy(f->set);
}

void
wlunloadfonts(void)
{
	/* Free the loaded fonts in the font cache.  */
	while (frclen > 0)
		wld_font_close(frc[--frclen].font);

	wlunloadfont(&dc.font);
	wlunloadfont(&dc.bfont);
	wlunloadfont(&dc.ifont);
	wlunloadfont(&dc.ibfont);
}

void
wlzoom(const Arg *arg)
{
	Arg larg;

	larg.f = usedfontsize + arg->f;
	wlzoomabs(&larg);
}

void
wlzoomabs(const Arg *arg)
{
	wlunloadfonts();
	wlloadfonts(usedfont, arg->f);
	cresize(0, 0);
	ttyresize();
	redraw();
	/* XXX: Should the window size be updated here because wayland doesn't
	 * have a notion of hints?
	 * xhints();
	 */
}

void
wlzoomreset(const Arg *arg)
{
	Arg larg;

	if (defaultfontsize > 0) {
		larg.f = defaultfontsize;
		wlzoomabs(&larg);
	}
}

void
wlinit(void)
{
	struct wl_registry *registry;

	if (!(wl.dpy = wl_display_connect(NULL)))
		die("Can't open display\n");

	registry = wl_display_get_registry(wl.dpy);
	wl_registry_add_listener(registry, &reglistener, NULL);
	wld.ctx = wld_wayland_create_context(wl.dpy, WLD_ANY);
	wld.renderer = wld_create_renderer(wld.ctx);

	wl_display_roundtrip(wl.dpy);

	if (!wl.shm)
		die("Display has no SHM\n");
	if (!wl.seat)
		die("Display has no seat\n");
	if (!wl.datadevmanager)
		die("Display has no data device manager\n");

	wl.keyboard = wl_seat_get_keyboard(wl.seat);
	wl_keyboard_add_listener(wl.keyboard, &kbdlistener, NULL);
	wl.pointer = wl_seat_get_pointer(wl.seat);
	wl_pointer_add_listener(wl.pointer, &ptrlistener, NULL);
	wl.datadev = wl_data_device_manager_get_data_device(wl.datadevmanager,
			wl.seat);
	wl_data_device_add_listener(wl.datadev, &datadevlistener, NULL);

	/* font */
	if (!FcInit())
		die("Could not init fontconfig.\n");

	usedfont = (opt_font == NULL)? font : opt_font;
	wld.fontctx = wld_font_create_context();
	wlloadfonts(usedfont, 0);

	wlloadcols();
	wlloadcursor();

	wl.vis = 0;
	wl.h = 2 * borderpx + term.row * wl.ch;
	wl.w = 2 * borderpx + term.col * wl.cw;

	wl.surface = wl_compositor_create_surface(wl.cmp);
	wl_surface_add_listener(wl.surface, &surflistener, NULL);

	wl.xdgsurface = xdg_shell_get_xdg_surface(wl.shell, wl.surface);
	xdg_surface_add_listener(wl.xdgsurface, &xdgsurflistener, NULL);
	xdg_surface_set_app_id(wl.xdgsurface, opt_class ? opt_class : termname);

	wl.xkb.ctx = xkb_context_new(0);
	wlresettitle();
}

/*
 * TODO: Implement something like XftDrawGlyphFontSpec in wld, and then apply a
 * similar patch to ae1923d27533ff46400d93765e971558201ca1ee
 */

void
wldraws(char *s, Glyph base, int x, int y, int charlen, int bytelen)
{
	int winx = borderpx + x * wl.cw, winy = borderpx + y * wl.ch,
	    width = charlen * wl.cw, xp, i;
	int frcflags, charexists;
	int u8fl, u8fblen, u8cblen, doesexist;
	char *u8c, *u8fs;
	Rune unicodep;
	Font *font = &dc.font;
	FcResult fcres;
	FcPattern *fcpattern, *fontpattern;
	FcFontSet *fcsets[] = { NULL };
	FcCharSet *fccharset;
	uint32_t fg, bg, temp;
	int oneatatime;

	frcflags = FRC_NORMAL;

	/* Fallback on color display for attributes not supported by the font */
	if (base.mode & ATTR_ITALIC && base.mode & ATTR_BOLD) {
		if (dc.ibfont.badslant || dc.ibfont.badweight)
			base.fg = defaultattr;
		font = &dc.ibfont;
		frcflags = FRC_ITALICBOLD;
	} else if (base.mode & ATTR_ITALIC) {
		if (dc.ifont.badslant)
			base.fg = defaultattr;
		font = &dc.ifont;
		frcflags = FRC_ITALIC;
	} else if (base.mode & ATTR_BOLD) {
		if (dc.bfont.badweight)
			base.fg = defaultattr;
		font = &dc.ifont;
		frcflags = FRC_BOLD;
	}

	if (IS_TRUECOL(base.fg)) {
		fg = base.fg | 0xff000000;
	} else {
		fg = dc.col[base.fg];
	}

	if (IS_TRUECOL(base.bg)) {
		bg = base.bg | 0xff000000;
	} else {
		bg = dc.col[base.bg];
	}

	if (base.mode & ATTR_BOLD) {
		/*
		 * change basic system colors [0-7]
		 * to bright system colors [8-15]
		 */
		if (BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
			fg = dc.col[base.fg + 8];

		if (base.mode & ATTR_ITALIC) {
			font = &dc.ibfont;
			frcflags = FRC_ITALICBOLD;
		} else {
			font = &dc.bfont;
			frcflags = FRC_BOLD;
		}
	}

	if (IS_SET(MODE_REVERSE)) {
		if (fg == dc.col[defaultfg]) {
			fg = dc.col[defaultbg];
		} else {
			fg = ~(fg & 0xffffff);
		}

		if (bg == dc.col[defaultbg]) {
			bg = dc.col[defaultfg];
		} else {
			bg = ~(bg & 0xffffff);
		}
	}

	if (base.mode & ATTR_REVERSE) {
		temp = fg;
		fg = bg;
		bg = temp;
	}

	if (base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
		fg = (fg & (0xff << 24))
			| ((((fg >> 16) & 0xff) / 2) << 16)
			| ((((fg >> 8) & 0xff) / 2) << 8)
			| ((fg & 0xff) / 2);
	}

	if (base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
		fg = bg;

	if (base.mode & ATTR_INVISIBLE)
		fg = bg;

	/* Intelligent cleaning up of the borders. */
	if (x == 0) {
		wlclear(0, (y == 0)? 0 : winy, borderpx,
			((y >= term.row-1)? wl.h : (winy + wl.ch)));
	}
	if (x + charlen >= term.col) {
		wlclear(winx + width, (y == 0)? 0 : winy, wl.w,
			((y >= term.row-1)? wl.h : (winy + wl.ch)));
	}
	if (y == 0)
		wlclear(winx, 0, winx + width, borderpx);
	if (y == term.row-1)
		wlclear(winx, winy + wl.ch, winx + width, wl.h);

	/* Clean up the region we want to draw to. */
	wld_fill_rectangle(wld.renderer, bg, winx, winy, width, wl.ch);

	for (xp = winx; bytelen > 0;) {
		/*
		 * Search for the range in the to be printed string of glyphs
		 * that are in the main font. Then print that range. If
		 * some glyph is found that is not in the font, do the
		 * fallback dance.
		 */
		u8fs = s;
		u8fblen = 0;
		u8fl = 0;
		oneatatime = font->width != wl.cw;
		for (;;) {
			u8c = s;
			u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
			s += u8cblen;
			bytelen -= u8cblen;

			doesexist = wld_font_ensure_char(font->match, unicodep);
			if (doesexist) {
					u8fl++;
					u8fblen += u8cblen;
					if (!oneatatime && bytelen > 0)
							continue;
			}

			if (u8fl > 0) {
				wld_draw_text(wld.renderer,
						font->match, fg, xp,
						winy + font->ascent,
						u8fs, u8fblen, NULL);
				xp += wl.cw * u8fl;
			}
			break;
		}
		if (doesexist) {
			if (oneatatime)
				continue;
			break;
		}

		/* Search the font cache. */
		for (i = 0; i < frclen; i++) {
			charexists = wld_font_ensure_char(frc[i].font, unicodep);
			/* Everything correct. */
			if (charexists && frc[i].flags == frcflags)
				break;
			/* We got a default font for a not found glyph. */
			if (!charexists && frc[i].flags == frcflags \
					&& frc[i].unicodep == unicodep) {
				break;
			}
		}

		/* Nothing was found. */
		if (i >= frclen) {
			if (!font->set)
				font->set = FcFontSort(0, font->pattern,
				                       1, 0, &fcres);
			fcsets[0] = font->set;

			/*
			 * Nothing was found in the cache. Now use
			 * some dozen of Fontconfig calls to get the
			 * font for one single character.
			 *
			 * Xft and fontconfig are design failures.
			 */
			fcpattern = FcPatternDuplicate(font->pattern);
			fccharset = FcCharSetCreate();

			FcCharSetAddChar(fccharset, unicodep);
			FcPatternAddCharSet(fcpattern, FC_CHARSET,
					fccharset);
			FcPatternAddBool(fcpattern, FC_SCALABLE, 1);

			FcConfigSubstitute(0, fcpattern,
					FcMatchPattern);
			FcDefaultSubstitute(fcpattern);

			fontpattern = FcFontSetMatch(0, fcsets, 1,
					fcpattern, &fcres);

			/*
			 * Overwrite or create the new cache entry.
			 */
			if (frclen >= LEN(frc)) {
				frclen = LEN(frc) - 1;
				wld_font_close(frc[frclen].font);
				frc[frclen].unicodep = 0;
			}

			frc[frclen].font = wld_font_open_pattern(wld.fontctx,
					fontpattern);
			frc[frclen].flags = frcflags;
			frc[frclen].unicodep = unicodep;

			i = frclen;
			frclen++;

			FcPatternDestroy(fcpattern);
			FcCharSetDestroy(fccharset);
		}

		wld_draw_text(wld.renderer, frc[i].font, fg,
				xp, winy + frc[i].font->ascent,
				u8c, u8cblen, NULL);

		xp += wl.cw * wcwidth(unicodep);
	}

	if (base.mode & ATTR_UNDERLINE) {
		wld_fill_rectangle(wld.renderer, fg, winx, winy + font->ascent + 1,
				width, 1);
	}

	if (base.mode & ATTR_STRUCK) {
		wld_fill_rectangle(wld.renderer, fg, winx, winy + 2 * font->ascent / 3,
				width, 1);
	}
}

void
wldrawglyph(Glyph g, int x, int y)
{
	static char buf[UTF_SIZ];
	size_t len = utf8encode(g.u, buf);
	int width = g.mode & ATTR_WIDE ? 2 : 1;

	wldraws(buf, g, x, y, width, len);
}

void
wldrawcursor(void)
{
	static int oldx = 0, oldy = 0;
	int curx;
	Glyph g = {' ', ATTR_NULL, defaultbg, defaultcs}, og;
	int ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
	uint32_t drawcol;

	LIMIT(oldx, 0, term.col-1);
	LIMIT(oldy, 0, term.row-1);

	curx = term.c.x;

	/* adjust position if in dummy */
	if (term.line[oldy][oldx].mode & ATTR_WDUMMY)
		oldx--;
	if (term.line[term.c.y][curx].mode & ATTR_WDUMMY)
		curx--;

	/* remove the old cursor */
	og = term.line[oldy][oldx];
	if (ena_sel && selected(oldx, oldy))
		og.mode ^= ATTR_REVERSE;
	wldrawglyph(og, oldx, oldy);
	if (oldx != curx || oldy != term.c.y) {
		wl_surface_damage(wl.surface, borderpx + oldx * wl.cw,
				borderpx + oldy * wl.ch, wl.cw, wl.ch);
	}

	g.u = term.line[term.c.y][term.c.x].u;

	/*
	 * Select the right color for the right mode.
	 */
	if (IS_SET(MODE_REVERSE)) {
		g.mode |= ATTR_REVERSE;
		g.bg = defaultfg;
		if (ena_sel && selected(term.c.x, term.c.y)) {
			drawcol = dc.col[defaultcs];
			g.fg = defaultrcs;
		} else {
			drawcol = dc.col[defaultrcs];
			g.fg = defaultcs;
		}
	} else {
		if (ena_sel && selected(term.c.x, term.c.y)) {
			drawcol = dc.col[defaultrcs];
			g.fg = defaultfg;
			g.bg = defaultrcs;
		} else {
			drawcol = dc.col[defaultcs];
		}
	}

	if (IS_SET(MODE_HIDE))
		return;

	/* draw the new one */
	if (wl.state & WIN_FOCUSED) {
		switch (wl.cursor) {
		case 7: /* st extension: snowman */
			utf8decode("☃", &g.u, UTF_SIZ);
		case 0: /* Blinking Block */
		case 1: /* Blinking Block (Default) */
		case 2: /* Steady Block */
			g.mode |= term.line[term.c.y][curx].mode & ATTR_WIDE;
			wldrawglyph(g, term.c.x, term.c.y);
			break;
		case 3: /* Blinking Underline */
		case 4: /* Steady Underline */
			wld_fill_rectangle(wld.renderer, drawcol,
					borderpx + curx * wl.cw,
					borderpx + (term.c.y + 1) * wl.ch - \
						cursorthickness,
					wl.cw, cursorthickness);
			break;
		case 5: /* Blinking bar */
		case 6: /* Steady bar */
			wld_fill_rectangle(wld.renderer, drawcol,
					borderpx + curx * wl.cw,
					borderpx + term.c.y * wl.ch,
					cursorthickness, wl.ch);
			break;
		}
	} else {
		wld_fill_rectangle(wld.renderer, drawcol,
				borderpx + curx * wl.cw,
				borderpx + term.c.y * wl.ch,
				wl.cw - 1, 1);
		wld_fill_rectangle(wld.renderer, drawcol,
				borderpx + curx * wl.cw,
				borderpx + term.c.y * wl.ch,
				1, wl.ch - 1);
		wld_fill_rectangle(wld.renderer, drawcol,
				borderpx + (curx + 1) * wl.cw - 1,
				borderpx + term.c.y * wl.ch,
				1, wl.ch - 1);
		wld_fill_rectangle(wld.renderer, drawcol,
				borderpx + curx * wl.cw,
				borderpx + (term.c.y + 1) * wl.ch - 1,
				wl.cw, 1);
	}
	wl_surface_damage(wl.surface, borderpx + curx * wl.cw,
			borderpx + term.c.y * wl.ch, wl.cw, wl.ch);
	oldx = curx, oldy = term.c.y;
}

void
wlsettitle(char *title)
{
	xdg_surface_set_title(wl.xdgsurface, title);
}

void
wlresettitle(void)
{
	wlsettitle(opt_title ? opt_title : "st");
}

void
redraw(void)
{
	tfulldirt();
}

void
draw(void)
{
	int y, y0;

	for (y = 0; y <= term.bot; ++y) {
		if (!term.dirty[y])
			continue;
		for (y0 = y; y <= term.bot && term.dirty[y]; ++y);
		wl_surface_damage(wl.surface, 0, borderpx + y0 * wl.ch,
				wl.w, (y - y0) * wl.ch);
	}

	wld_set_target_buffer(wld.renderer, wld.buffer);
	drawregion(0, 0, term.col, term.row);
	wl.framecb = wl_surface_frame(wl.surface);
	wl_callback_add_listener(wl.framecb, &framelistener, NULL);
	wld_flush(wld.renderer);
	wl_surface_attach(wl.surface, wl.buffer, 0, 0);
	wl_surface_commit(wl.surface);
	/* need to wait to destroy the old buffer until we commit the new
	 * buffer */
	if (wld.oldbuffer) {
		wld_buffer_unreference(wld.oldbuffer);
		wld.oldbuffer = 0;
	}
	needdraw = false;
}

void
drawregion(int x1, int y1, int x2, int y2)
{
	int ic, ib, x, y, ox;
	Glyph base, new;
	char buf[DRAW_BUF_SIZ];
	int ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);

	for (y = y1; y < y2; y++) {
		if (!term.dirty[y])
			continue;

		term.dirty[y] = 0;
		base = term.line[y][0];
		ic = ib = ox = 0;
		for (x = x1; x < x2; x++) {
			new = term.line[y][x];
			if (new.mode == ATTR_WDUMMY)
				continue;
			if (ena_sel && selected(x, y))
				new.mode ^= ATTR_REVERSE;
			if (ib > 0 && (ATTRCMP(base, new)
					|| ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
				wldraws(buf, base, ox, y, ic, ib);
				ic = ib = 0;
			}
			if (ib == 0) {
				ox = x;
				base = new;
			}

			ib += utf8encode(new.u, buf+ib);
			ic += (new.mode & ATTR_WIDE)? 2 : 1;
		}
		if (ib > 0)
			wldraws(buf, base, ox, y, ic, ib);
	}
	wldrawcursor();
}

void
wlseturgency(int add)
{
	/* XXX: no urgency equivalent yet in wayland */
}

int
match(uint mask, uint state)
{
	return mask == MOD_MASK_ANY || mask == (state & ~(ignoremod));
}

void
numlock(const Arg *dummy)
{
	term.numlock ^= 1;
}

char*
kmap(xkb_keysym_t k, uint state)
{
	Key *kp;
	int i;

	/* Check for mapped keys out of X11 function keys. */
	for (i = 0; i < LEN(mappedkeys); i++) {
		if (mappedkeys[i] == k)
			break;
	}
	if (i == LEN(mappedkeys)) {
		if ((k & 0xFFFF) < 0xFD00)
			return NULL;
	}

	for (kp = key; kp < key + LEN(key); kp++) {
		if (kp->k != k)
			continue;

		if (!match(kp->mask, state))
			continue;

		if (IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
			continue;
		if (term.numlock && kp->appkey == 2)
			continue;

		if (IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
			continue;

		if (IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
			continue;

		return kp->s;
	}

	return NULL;
}

void
cresize(int width, int height)
{
	int col, row;

	if (width != 0)
		wl.w = width;
	if (height != 0)
		wl.h = height;

	col = (wl.w - 2 * borderpx) / wl.cw;
	row = (wl.h - 2 * borderpx) / wl.ch;

	tresize(col, row);
	wlresize(col, row);
}

void
regglobal(void *data, struct wl_registry *registry, uint32_t name,
          const char *interface, uint32_t version)
{
	if (strcmp(interface, "wl_compositor") == 0) {
		wl.cmp = wl_registry_bind(registry, name,
				&wl_compositor_interface, 3);
	} else if (strcmp(interface, "xdg_shell") == 0) {
		wl.shell = wl_registry_bind(registry, name,
				&xdg_shell_interface, 1);
		xdg_shell_add_listener(wl.shell, &xdgshelllistener, NULL);
		xdg_shell_use_unstable_version(wl.shell,
				XDG_SHELL_VERSION_CURRENT);
	} else if (strcmp(interface, "wl_shm") == 0) {
		wl.shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
	} else if (strcmp(interface, "wl_seat") == 0) {
		wl.seat = wl_registry_bind(registry, name,
				&wl_seat_interface, 4);
	} else if (strcmp(interface, "wl_data_device_manager") == 0) {
		wl.datadevmanager = wl_registry_bind(registry, name,
				&wl_data_device_manager_interface, 1);
	} else if (strcmp(interface, "wl_output") == 0) {
		/* bind to outputs so we can get surface enter events */
		wl_registry_bind(registry, name, &wl_output_interface, 2);
	}
}

void
regglobalremove(void *data, struct wl_registry *registry, uint32_t name)
{
}

void
surfenter(void *data, struct wl_surface *surface, struct wl_output *output)
{
	wl.vis++;
	if (!(wl.state & WIN_VISIBLE))
		wl.state |= WIN_VISIBLE;
}

void
surfleave(void *data, struct wl_surface *surface, struct wl_output *output)
{
	if (--wl.vis == 0)
		wl.state &= ~WIN_VISIBLE;
}

void
framedone(void *data, struct wl_callback *callback, uint32_t msecs)
{
	wl_callback_destroy(callback);
	wl.framecb = NULL;
	if (needdraw && wl.state & WIN_VISIBLE) {
		draw();
	}
}

void
kbdkeymap(void *data, struct wl_keyboard *keyboard, uint32_t format, int32_t fd,
          uint32_t size)
{
	char *string;

	if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
		close(fd);
		return;
	}

	string = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);

	if (string == MAP_FAILED) {
		close(fd);
		return;
	}

	wl.xkb.keymap = xkb_keymap_new_from_string(wl.xkb.ctx, string,
			XKB_KEYMAP_FORMAT_TEXT_V1, 0);
	munmap(string, size);
	close(fd);
	wl.xkb.state = xkb_state_new(wl.xkb.keymap);

	wl.xkb.ctrl = xkb_keymap_mod_get_index(wl.xkb.keymap, XKB_MOD_NAME_CTRL);
	wl.xkb.alt = xkb_keymap_mod_get_index(wl.xkb.keymap, XKB_MOD_NAME_ALT);
	wl.xkb.shift = xkb_keymap_mod_get_index(wl.xkb.keymap, XKB_MOD_NAME_SHIFT);
	wl.xkb.logo = xkb_keymap_mod_get_index(wl.xkb.keymap, XKB_MOD_NAME_LOGO);

	wl.xkb.mods = 0;
}

void
kbdenter(void *data, struct wl_keyboard *keyboard, uint32_t serial,
         struct wl_surface *surface, struct wl_array *keys)
{
	wl.state |= WIN_FOCUSED;
	if (IS_SET(MODE_FOCUS))
		ttywrite("\033[I", 3);
	/* need to redraw the cursor */
	needdraw = true;
}

void
kbdleave(void *data, struct wl_keyboard *keyboard, uint32_t serial,
	 struct wl_surface *surface)
{
	/* selection offers are invalidated when we lose keyboard focus */
	wl.seloffer = NULL;
	wl.state &= ~WIN_FOCUSED;
	if (IS_SET(MODE_FOCUS))
		ttywrite("\033[O", 3);
	/* need to redraw the cursor */
	needdraw = true;
	/* disable key repeat */
	repeat.len = 0;
}

void
kbdkey(void *data, struct wl_keyboard *keyboard, uint32_t serial, uint32_t time,
       uint32_t key, uint32_t state)
{
	xkb_keysym_t ksym;
	char buf[32], *str;
	int len;
	Rune c;
	Shortcut *bp;

	if (IS_SET(MODE_KBDLOCK))
		return;

	if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
		wl.globalserial = serial;
		return;
	}
	
	if (state == WL_KEYBOARD_KEY_STATE_RELEASED) {
		if (repeat.key == key)
			repeat.len = 0;
		return;
	}

	ksym = xkb_state_key_get_one_sym(wl.xkb.state, key + 8);
	len = xkb_keysym_to_utf8(ksym, buf, sizeof buf);
	if (len > 0)
	    --len;

	/* 1. shortcuts */
	for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
		if (ksym == bp->keysym && match(bp->mod, wl.xkb.mods)) {
			bp->func(&(bp->arg));
			return;
		}
	}

	/* 2. custom keys from config.h */
	if ((str = kmap(ksym, wl.xkb.mods))) {
		len = strlen(str);
		goto send;
	}

	/* 3. composed string from input method */
	if (len == 0)
		return;
	if (len == 1 && wl.xkb.mods & MOD_MASK_ALT) {
		if (IS_SET(MODE_8BIT)) {
			if (*buf < 0177) {
				c = *buf | 0x80;
				len = utf8encode(c, buf);
			}
		} else {
			buf[1] = buf[0];
			buf[0] = '\033';
			len = 2;
		}
	}
	/* convert character to control character */
	else if (len == 1 && wl.xkb.mods & MOD_MASK_CTRL) {
		if ((*buf >= '@' && *buf < '\177') || *buf == ' ')
			*buf &= 0x1F;
		else if (*buf == '2') *buf = '\000';
		else if (*buf >= '3' && *buf <= '7')
			*buf -= ('3' - '\033');
		else if (*buf == '8') *buf = '\177';
		else if (*buf == '/') *buf = '_' & 0x1F;
	}

	str = buf;

send:
	memcpy(repeat.str, str, len);
	repeat.key = key;
	repeat.len = len;
	repeat.started = false;
	clock_gettime(CLOCK_MONOTONIC, &repeat.last);
	ttysend(str, len);
}

void
kbdmodifiers(void *data, struct wl_keyboard *keyboard, uint32_t serial,
             uint32_t dep, uint32_t lat, uint32_t lck, uint32_t group)
{
	xkb_mod_mask_t mod_mask;

	xkb_state_update_mask(wl.xkb.state, dep, lat, lck, group, 0, 0);

	mod_mask = xkb_state_serialize_mods(wl.xkb.state, XKB_STATE_MODS_EFFECTIVE);
	wl.xkb.mods = 0;

	if (mod_mask & (1 << wl.xkb.ctrl))
		wl.xkb.mods |= MOD_MASK_CTRL;
	if (mod_mask & (1 << wl.xkb.alt))
		wl.xkb.mods |= MOD_MASK_ALT;
	if (mod_mask & (1 << wl.xkb.shift))
		wl.xkb.mods |= MOD_MASK_SHIFT;
	if (mod_mask & (1 << wl.xkb.logo))
		wl.xkb.mods |= MOD_MASK_LOGO;
}

void
kbdrepeatinfo(void *data, struct wl_keyboard *keyboard, int32_t rate,
              int32_t delay)
{
	keyrepeatdelay = delay;
	keyrepeatinterval = 1000 / rate;
}

void
ptrenter(void *data, struct wl_pointer *pointer, uint32_t serial,
         struct wl_surface *surface, wl_fixed_t x, wl_fixed_t y)
{
	struct wl_cursor_image *img = cursor.cursor->images[0];
	struct wl_buffer *buffer;

	wl_pointer_set_cursor(pointer, serial, cursor.surface,
			img->hotspot_x, img->hotspot_y);
	buffer = wl_cursor_image_get_buffer(img);
	wl_surface_attach(cursor.surface, buffer, 0, 0);
	wl_surface_damage(cursor.surface, 0, 0, img->width, img->height);
	wl_surface_commit(cursor.surface);
}

void
ptrleave(void *data, struct wl_pointer *pointer, uint32_t serial,
         struct wl_surface *surface)
{
}

void
ptrmotion(void *data, struct wl_pointer * pointer, uint32_t serial,
          wl_fixed_t x, wl_fixed_t y)
{
	int oldey, oldex, oldsby, oldsey;

	if (IS_SET(MODE_MOUSE)) {
		wlmousereportmotion(x, y);
		return;
	}

	wl.px = wl_fixed_to_int(x);
	wl.py = wl_fixed_to_int(y);

	if (!sel.mode)
		return;

	sel.mode = SEL_READY;
	oldey = sel.oe.y;
	oldex = sel.oe.x;
	oldsby = sel.nb.y;
	oldsey = sel.ne.y;
	getbuttoninfo();

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

void
ptrbutton(void * data, struct wl_pointer * pointer, uint32_t serial,
          uint32_t time, uint32_t button, uint32_t state)
{
	MouseShortcut *ms;

	if (IS_SET(MODE_MOUSE) && !(wl.xkb.mods & forceselmod)) {
		wlmousereportbutton(button, state);
		return;
	}

	switch (state) {
	case WL_POINTER_BUTTON_STATE_RELEASED:
		if (button == BTN_MIDDLE) {
			selpaste(NULL);
		} else if (button == BTN_LEFT) {
			wl.globalserial = serial;
			if (sel.mode == SEL_READY) {
				getbuttoninfo();
				selcopy(serial);
			} else
				selclear();
			sel.mode = SEL_IDLE;
			tsetdirt(sel.nb.y, sel.ne.y);
		}
		break;

	case WL_POINTER_BUTTON_STATE_PRESSED:
		for (ms = mshortcuts; ms < mshortcuts + LEN(mshortcuts); ms++) {
			if (button == ms->b && match(ms->mask, wl.xkb.mods)) {
				ttysend(ms->s, strlen(ms->s));
				return;
			}
		}

		if (button == BTN_LEFT) {
			/* Clear previous selection, logically and visually. */
			selclear();
			sel.mode = SEL_EMPTY;
			sel.type = SEL_REGULAR;
			sel.oe.x = sel.ob.x = x2col(wl.px);
			sel.oe.y = sel.ob.y = y2row(wl.py);

			/*
			 * If the user clicks below predefined timeouts
			 * specific snapping behaviour is exposed.
			 */
			if (time - sel.tclick2 <= tripleclicktimeout) {
				sel.snap = SNAP_LINE;
			} else if (time - sel.tclick1 <= doubleclicktimeout) {
				sel.snap = SNAP_WORD;
			} else {
				sel.snap = 0;
			}
			selnormalize();

			if (sel.snap != 0)
				sel.mode = SEL_READY;
			tsetdirt(sel.nb.y, sel.ne.y);
			sel.tclick2 = sel.tclick1;
			sel.tclick1 = time;
		}
		break;
	}
}

void
ptraxis(void * data, struct wl_pointer * pointer, uint32_t time, uint32_t axis,
        wl_fixed_t value)
{
	Axiskey *ak;
	int dir = value > 0 ? +1 : -1;

	if (IS_SET(MODE_MOUSE) && !(wl.xkb.mods & forceselmod)) {
		wlmousereportaxis(axis, value);
		return;
	}

	for (ak = ashortcuts; ak < ashortcuts + LEN(ashortcuts); ak++) {
		if (axis == ak->axis && dir == ak->dir
				&& match(ak->mask, wl.xkb.mods)) {
			ttysend(ak->s, strlen(ak->s));
			return;
		}
	}
}

void
xdgshellping(void *data, struct xdg_shell *shell, uint32_t serial)
{
	xdg_shell_pong(shell, serial);
}

void
xdgsurfconfigure(void *data, struct xdg_surface *surf, int32_t w, int32_t h,
                 struct wl_array *states, uint32_t serial)
{
	xdg_surface_ack_configure(surf, serial);
	if (w == wl.w && h == wl.h)
		return;
	cresize(w, h);
	if (wl.configured)
		ttyresize();
	else
		wl.configured = true;
}

void
xdgsurfclose(void *data, struct xdg_surface *surf)
{
	/* Send SIGHUP to shell */
	kill(pid, SIGHUP);
	exit(0);
}

void
datadevoffer(void *data, struct wl_data_device *datadev,
             struct wl_data_offer *offer)
{
	wl_data_offer_add_listener(offer, &dataofferlistener, NULL);
}

void
datadeventer(void *data, struct wl_data_device *datadev, uint32_t serial,
		struct wl_surface *surf, wl_fixed_t x, wl_fixed_t y,
		struct wl_data_offer *offer)
{
}

void
datadevleave(void *data, struct wl_data_device *datadev)
{
}

void
datadevmotion(void *data, struct wl_data_device *datadev, uint32_t time,
              wl_fixed_t x, wl_fixed_t y)
{
}

void
datadevdrop(void *data, struct wl_data_device *datadev)
{
}

void
datadevselection(void *data, struct wl_data_device *datadev,
                 struct wl_data_offer *offer)
{
	if (offer && (uintptr_t) wl_data_offer_get_user_data(offer) == 1)
		wl.seloffer = offer;
	else
		wl.seloffer = NULL;
}

void
dataofferoffer(void *data, struct wl_data_offer *offer, const char *mimetype)
{
	/* mark the offer as usable if it supports plain text */
	if (strncmp(mimetype, "text/plain", 10) == 0)
		wl_data_offer_set_user_data(offer, (void *)(uintptr_t) 1);
}

void
datasrctarget(void *data, struct wl_data_source *source, const char *mimetype)
{
}

void
datasrcsend(void *data, struct wl_data_source *source, const char *mimetype,
            int32_t fd)
{
	char *buf = sel.primary;
	int len = strlen(sel.primary);
	ssize_t ret;
	while ((ret = write(fd, buf, MIN(len, BUFSIZ))) > 0) {
		len -= ret;
		buf += ret;
	}
	close(fd);
}

void
datasrccancelled(void *data, struct wl_data_source *source)
{
	if (sel.source == source) {
		sel.source = NULL;
		selclear();
	}
	wl_data_source_destroy(source);
}

void
run(void)
{
	fd_set rfd;
	int wlfd = wl_display_get_fd(wl.dpy), blinkset = 0;
	struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
	ulong msecs;

	/* Look for initial configure. */
	wl_display_roundtrip(wl.dpy);
	if (!wl.configured)
		cresize(wl.w, wl.h);
	ttynew();
	ttyresize();
	draw();

	clock_gettime(CLOCK_MONOTONIC, &last);
	lastblink = last;

	for (;;) {
		FD_ZERO(&rfd);
		FD_SET(cmdfd, &rfd);
		FD_SET(wlfd, &rfd);

		if (pselect(MAX(wlfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
			if (errno == EINTR)
				continue;
			die("select failed: %s\n", strerror(errno));
		}

		if (FD_ISSET(cmdfd, &rfd)) {
			ttyread();
			if (blinktimeout) {
				blinkset = tattrset(ATTR_BLINK);
				if (!blinkset)
					MODBIT(term.mode, 0, MODE_BLINK);
			}
		}

		if (FD_ISSET(wlfd, &rfd)) {
			if (wl_display_dispatch(wl.dpy) == -1)
				die("Connection error\n");
		}

		clock_gettime(CLOCK_MONOTONIC, &now);
		msecs = -1;

		if (blinkset && blinktimeout) {
			if (TIMEDIFF(now, lastblink) >= blinktimeout) {
				tsetdirtattr(ATTR_BLINK);
				term.mode ^= MODE_BLINK;
				lastblink = now;
			} else {
				msecs = MIN(msecs, blinktimeout - \
						TIMEDIFF(now, lastblink));
			}
		}
		if (repeat.len > 0) {
			if (TIMEDIFF(now, repeat.last) >= \
				(repeat.started ? keyrepeatinterval : \
					keyrepeatdelay)) {
				repeat.started = true;
				repeat.last = now;
				ttysend(repeat.str, repeat.len);
			} else {
				msecs = MIN(msecs, (repeat.started ? \
					keyrepeatinterval : keyrepeatdelay) - \
					TIMEDIFF(now, repeat.last));
			}
		}

		if (needdraw && wl.state & WIN_VISIBLE) {
			if (!wl.framecb) {
				draw();
			}
		}

		if (msecs == -1) {
			tv = NULL;
		} else {
			drawtimeout.tv_nsec = 1E6 * msecs;
			drawtimeout.tv_sec = 0;
			tv = &drawtimeout;
		}

		wl_display_dispatch_pending(wl.dpy);
		wl_display_flush(wl.dpy);
	}
}

void
usage(void)
{
	die("usage: %s [-aiv] [-c class] [-f font] [-g geometry]"
	    " [-n name] [-o file]\n"
	    "          [-T title] [-t title] [-w windowid]"
	    " [[-e] command [args ...]]\n"
	    "       %s [-aiv] [-c class] [-f font] [-g geometry]"
	    " [-n name] [-o file]\n"
	    "          [-T title] [-t title] [-w windowid] -l line"
	    " [stty_args ...]\n", argv0, argv0);
}

int
main(int argc, char *argv[])
{
	wl.cursor = cursorshape;

	ARGBEGIN {
	case 'a':
		allowaltscreen = 0;
		break;
	case 'c':
		opt_class = EARGF(usage());
		break;
	case 'e':
		if (argc > 0)
			--argc, ++argv;
		goto run;
	case 'f':
		opt_font = EARGF(usage());
		break;
	case 'o':
		opt_io = EARGF(usage());
		break;
	case 'l':
		opt_line = EARGF(usage());
		break;
	case 'n':
		opt_name = EARGF(usage());
		break;
	case 't':
	case 'T':
		opt_title = EARGF(usage());
		break;
	case 'w':
		opt_embed = EARGF(usage());
		break;
	case 'v':
		die("%s " VERSION " (c) 2010-2016 st engineers\n", argv0);
		break;
	default:
		usage();
	} ARGEND;

run:
	if (argc > 0) {
		/* eat all remaining arguments */
		opt_cmd = argv;
		if (!opt_title && !opt_line)
			opt_title = basename(xstrdup(argv[0]));
	}
	setlocale(LC_CTYPE, "");
	tnew(MAX(cols, 1), MAX(rows, 1));
	wlinit();
	selinit();
	run();

	return 0;
}