path: root/terms.c

/* $Id: terms.c,v 1.13 2001/11/21 19:24:35 ukai Exp $ */
/* 
 * An original curses library for EUC-kanji by Akinori ITO,     December 1989
 * revised by Akinori ITO, January 1995
 */
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <unistd.h>
#include "config.h"
#include <string.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef USE_MOUSE
#ifdef USE_GPM
#include <gpm.h>
#endif				/* USE_GPM */
#ifdef USE_SYSMOUSE
#include <osreldate.h>
#if (__FreeBSD_version >= 400017)
#include <sys/consio.h>
#include <sys/fbio.h>
#else
#include <machine/console.h>
#endif
int (*sysm_handler) (int x, int y, int nbs, int obs);
static int cwidth = 8, cheight = 16;
static int xpix, ypix, nbs, obs = 0;
#endif				/* use_SYSMOUSE */

static int is_xterm = 0;
void mouse_init(), mouse_end();
int mouseActive = 0;
#endif				/* USE_MOUSE */

#include "terms.h"
#include "fm.h"
#include "myctype.h"

#ifdef __EMX__
#define INCL_DOSNLS
#include <os2.h>

#ifndef JP_CHARSET
extern int	CodePage;
#endif				/* !JP_CHARSET */
#endif				/* __EMX__ */

char *getenv(const char *);
MySignalHandler reset_exit(SIGNAL_ARG), error_dump(SIGNAL_ARG);
void setlinescols(void);
void flush_tty();

#ifndef SIGIOT
#define SIGIOT SIGABRT
#endif				/* not SIGIOT */

#ifdef HAVE_TERMIO_H
#include        <sys/ioctl.h>
#include        <termio.h>
typedef struct termio TerminalMode;
#define TerminalSet(fd,x)       ioctl(fd,TCSETA,x)
#define TerminalGet(fd,x)       ioctl(fd,TCGETA,x)
#define MODEFLAG(d)     ((d).c_lflag)
#define IMODEFLAG(d)    ((d).c_iflag)
#endif				/* HAVE_TERMIO_H */

#ifdef HAVE_TERMIOS_H
#include <termios.h>
#include <unistd.h>
typedef struct termios TerminalMode;
#define TerminalSet(fd,x)       tcsetattr(fd,TCSANOW,x)
#define TerminalGet(fd,x)       tcgetattr(fd,x)
#define MODEFLAG(d)     ((d).c_lflag)
#define IMODEFLAG(d)    ((d).c_iflag)
#endif				/* HAVE_TERMIOS_H */

#ifdef HAVE_SGTTY_H
#include        <sys/ioctl.h>
#include        <sgtty.h>
typedef struct sgttyb TerminalMode;
#define TerminalSet(fd,x)       ioctl(fd,TIOCSETP,x)
#define TerminalGet(fd,x)       ioctl(fd,TIOCGETP,x)
#define MODEFLAG(d)     ((d).sg_flags)
#endif				/* HAVE_SGTTY_H */

#define MAX_LINE        200
#define MAX_COLUMN      400

/* Screen properties */
#define S_SCREENPROP    0x0f
#define S_NORMAL        0x00
#define S_STANDOUT      0x01
#define S_UNDERLINE     0x02
#define S_BOLD          0x04
#define S_EOL           0x08

/* Sort of Character */
#define C_WHICHCHAR     0xc0
#define C_ASCII         0x00
#ifdef JP_CHARSET
#define C_WCHAR1        0x40
#define C_WCHAR2        0x80
#endif				/* JP_CHARSET */
#define C_CTRL          0xc0

#define CHMODE(c)       ((c)&C_WHICHCHAR)
#define SETCHMODE(var,mode)     var = (((var)&~C_WHICHCHAR) | mode)

/* Charactor Color */
#define COL_FCOLOR      0xf00
#define COL_FBLACK      0x800
#define COL_FRED        0x900
#define COL_FGREEN      0xa00
#define COL_FYELLOW     0xb00
#define COL_FBLUE       0xc00
#define COL_FMAGENTA    0xd00
#define COL_FCYAN       0xe00
#define COL_FWHITE      0xf00
#define COL_FTERM       0x000

#define S_COLORED       0xf00

#ifdef USE_BG_COLOR
/* Background Color */
#define COL_BCOLOR      0xf000
#define COL_BBLACK      0x8000
#define COL_BRED        0x9000
#define COL_BGREEN      0xa000
#define COL_BYELLOW     0xb000
#define COL_BBLUE       0xc000
#define COL_BMAGENTA    0xd000
#define COL_BCYAN       0xe000
#define COL_BWHITE      0xf000
#define COL_BTERM       0x0000

#define S_BCOLORED      0xf000
#endif				/* USE_BG_COLOR */


#define S_GRAPHICS      0x10

#define S_DIRTY         0x20

#define SETPROP(var,prop) (var = (((var)&S_DIRTY) | prop))

/* Line status */
#define L_DIRTY         0x01
#define L_UNUSED        0x02
#define L_NEED_CE       0x04
#define L_CLRTOEOL      0x08

#define ISDIRTY(d)      ((d) & L_DIRTY)
#define ISUNUSED(d)     ((d) & L_UNUSED)
#define NEED_CE(d)      ((d) & L_NEED_CE)

typedef unsigned short l_prop;

typedef struct scline {
    char *lineimage;
    l_prop *lineprop;
    short isdirty;
    short eol;
} Screen;

static
TerminalMode d_ioval;
static
int tty;
static
FILE *ttyf;

static
char bp[1024], funcstr[256];

char *T_cd, *T_ce, *T_kr, *T_kl, *T_cr, *T_bt, *T_ta, *T_sc, *T_rc,
*T_so, *T_se, *T_us, *T_ue, *T_cl, *T_cm, *T_al, *T_sr, *T_md, *T_me,
*T_ti, *T_te, *T_nd, *T_as, *T_ae, *T_eA, *T_ac, *T_op;

int LINES, COLS;
static int max_LINES = 0, max_COLS = 0;
static int tab_step = 8;
static int CurLine, CurColumn;
static Screen *ScreenElem = NULL, **ScreenImage = NULL;
static l_prop CurrentMode = 0;
static int graph_enabled = 0;

static char gcmap[96];

extern int tgetent(char *, char *);
extern int tgetnum(char *);
extern int tgetflag(char *);
extern char *tgetstr(char *, char **);
extern char *tgoto(char *, int, int);
extern int tputs(char *, int, int (*)(char));
void putchars(unsigned char, unsigned char, FILE *);
void clear(), wrap(), touch_line(), touch_column(int);
#ifdef JP_CHARSET
void switch_wchar(FILE *);
void switch_ascii(FILE *);
#endif
void need_clrtoeol(void), clrtoeol(void);

int write1(char);

/* #define writestr(s)  tputs(s,1,write1) */

static void
writestr(char *s)
{
    tputs(s, 1, write1);
}

#define MOVE(line,column)       writestr(tgoto(T_cm,column,line));

#ifdef USE_MOUSE
static char *xterm_mouse_term[] = {
     "xterm", "kterm", "rxvt", "cygwin", 
     NULL
};
#endif

int
set_tty(void)
{
    char *ttyn;

    if (isatty(0))		/* stdin */
	ttyn = ttyname(0);
    else
	ttyn = DEV_TTY_PATH;
    tty = open(ttyn, O_RDWR);
    if (tty < 0) {
	/* use stderr instead of stdin... is it OK???? */
	tty = 2;
    }
    ttyf = fdopen(tty, "w");
    TerminalGet(tty, &d_ioval);
#ifdef USE_MOUSE
    {
	char *term = getenv("TERM");
	char **p;
	for (p = xterm_mouse_term; *p != NULL; p++) {
	     if (!strncmp(term, *p, strlen(*p))) {
		  is_xterm = 1;
		  break;
	     }
	}
    }
#endif
    return 0;
}

void
ttymode_set(int mode, int imode)
{
    TerminalMode ioval;

    TerminalGet(tty, &ioval);
    MODEFLAG(ioval) |= mode;
#ifndef HAVE_SGTTY_H
    IMODEFLAG(ioval) |= imode;
#endif				/* not HAVE_SGTTY_H */

    while (TerminalSet(tty, &ioval) == -1) {
	if (errno == EINTR || errno == EAGAIN) continue;
	printf("Error occured while set %x: errno=%d\n", mode, errno);
	reset_exit(SIGNAL_ARGLIST);
    }
}

void
ttymode_reset(int mode, int imode)
{
    TerminalMode ioval;

    TerminalGet(tty, &ioval);
    MODEFLAG(ioval) &= ~mode;
#ifndef HAVE_SGTTY_H
    IMODEFLAG(ioval) &= ~imode;
#endif				/* not HAVE_SGTTY_H */

    while (TerminalSet(tty, &ioval) == -1) {
	if (errno == EINTR || errno == EAGAIN) continue;
	printf("Error occured while reset %x: errno=%d\n", mode, errno);
	reset_exit(SIGNAL_ARGLIST);
    }
}

#ifndef HAVE_SGTTY_H
void
set_cc(int spec, int val)
{
    TerminalMode ioval;

    TerminalGet(tty, &ioval);
    ioval.c_cc[spec] = val;
    while (TerminalSet(tty, &ioval) == -1) {
	if (errno == EINTR || errno == EAGAIN) continue;
	printf("Error occured: errno=%d\n", errno);
	reset_exit(SIGNAL_ARGLIST);
    }
}
#endif				/* not HAVE_SGTTY_H */

void
close_tty(void)
{
    close(tty);
}

void
reset_tty(void)
{
    if (DisplayCode != CODE_EUC && DisplayCode != CODE_SJIS)
#if defined(__EMX__)&&!defined(JP_CHARSET)
      if(!CodePage)
#endif
	writestr("\033(B");	/* designate US_ASCII */
    writestr(T_op);		/* turn off */
    writestr(T_me);
    if (!Do_not_use_ti_te) {
	if (T_te && *T_te)
	    writestr(T_te);
	else
	    writestr(T_cl);
    }
    writestr(T_se);		/* reset terminal */
    fflush(ttyf);
    TerminalSet(tty, &d_ioval);
    close(tty);
}

MySignalHandler
reset_exit(SIGNAL_ARG)
{
    reset_tty();
#ifdef USE_MOUSE
    if (mouseActive)
	mouse_end();
#endif				/* USE_MOUSE */
    w3m_exit(0);
    SIGNAL_RETURN;
}

MySignalHandler
error_dump(SIGNAL_ARG)
{
    signal(SIGIOT, SIG_DFL);
    reset_tty();
    abort();
    SIGNAL_RETURN;
}

void
set_int(void)
{
    signal(SIGHUP, reset_exit);
    signal(SIGINT, reset_exit);
    signal(SIGQUIT, reset_exit);
    signal(SIGTERM, reset_exit);
    signal(SIGILL, error_dump);
    signal(SIGIOT, error_dump);
    signal(SIGFPE, error_dump);
#ifdef	SIGBUS
    signal(SIGBUS, error_dump);
#endif				/* SIGBUS */
/* signal(SIGSEGV, error_dump); */
}


static void
setgraphchar(void)
{
    int c, i, n;

    for (c = 0; c < 96; c++)
	gcmap[c] = (char) (c + ' ');

    if (!T_ac)
	return;

    n = strlen(T_ac);
    for (i = 0; i < n - 1; i += 2) {
	c = (unsigned) T_ac[i] - ' ';
	if (c >= 0 && c < 96)
	    gcmap[c] = T_ac[i + 1];
    }
}

#define graphchar(c) (((unsigned)(c)>=' ' && (unsigned)(c)<128)? gcmap[(c)-' '] : (c))

#define GETSTR(v,s) {v = pt; suc = tgetstr(s,&pt); if (!suc) v = ""; else v = allocStr(suc,0); }

void
getTCstr(void)
{
    char *ent;
    char *suc;
    char *pt = funcstr;
    int r;

    ent = getenv("TERM") ? getenv("TERM") : DEFAULT_TERM;
    if (ent == NULL) {
	fprintf(stderr, "TERM is not set\n");
	reset_exit(SIGNAL_ARGLIST);
    }

    r = tgetent(bp, ent);
    if (r != 1) {
	/* Can't find termcap entry */
	fprintf(stderr, "Can't find termcap entry %s\n", ent);
	reset_exit(SIGNAL_ARGLIST);
    }

    GETSTR(T_ce, "ce");		/* clear to the end of line */
    GETSTR(T_cd, "cd");		/* clear to the end of display */
    GETSTR(T_kr, "nd");		/* cursor right */
    if (suc == NULL)
	GETSTR(T_kr, "kr");
    if (tgetflag("bs"))
	T_kl = "\b";		/* cursor left */
    else {
	GETSTR(T_kl, "le");
	if (suc == NULL)
	    GETSTR(T_kl, "kb");
	if (suc == NULL)
	    GETSTR(T_kl, "kl");
    }
    GETSTR(T_cr, "cr");		/* carriage return */
    GETSTR(T_ta, "ta");		/* tab */
    GETSTR(T_sc, "sc");		/* save cursor */
    GETSTR(T_rc, "rc");		/* restore cursor */
    GETSTR(T_so, "so");		/* standout mode */
    GETSTR(T_se, "se");		/* standout mode end */
    GETSTR(T_us, "us");		/* underline mode */
    GETSTR(T_ue, "ue");		/* underline mode end */
    GETSTR(T_md, "md");		/* bold mode */
    GETSTR(T_me, "me");		/* bold mode end */
    GETSTR(T_cl, "cl");		/* clear screen */
    GETSTR(T_cm, "cm");		/* cursor move */
    GETSTR(T_al, "al");		/* append line */
    GETSTR(T_sr, "sr");		/* scroll reverse */
    GETSTR(T_ti, "ti");		/* terminal init */
    GETSTR(T_te, "te");		/* terminal end */
    GETSTR(T_nd, "nd");		/* move right one space */
    GETSTR(T_eA, "eA");		/* enable alternative charset */
    GETSTR(T_as, "as");		/* alternative (graphic) charset start */
    GETSTR(T_ae, "ae");		/* alternative (graphic) charset end */
    GETSTR(T_ac, "ac");		/* graphics charset pairs */
    GETSTR(T_op, "op");		/* set default color pair to its original
				 * * * * * * * value */
#if defined( CYGWIN ) && CYGWIN < 1
/* for TERM=pcansi on MS-DOS prompt.
    T_eA = "";
    T_as = "\033[12m";
    T_ae = "\033[10m";
    T_ac = "l\001k\002m\003j\004x\005q\006n\020a\024v\025w\026u\027t\031";
*/
    T_eA = "";
    T_as = "";
    T_ae = "";
    T_ac = "";
#endif				/* CYGWIN */

    LINES = COLS = 0;
    setlinescols();
    setgraphchar();
}

#ifndef TIOCGWINSZ
#include <sys/ioctl.h>
#endif				/* not TIOCGWINSZ */

void
setlinescols(void)
{
    char *p;
    int i;
#ifdef __EMX__
    {
	int s[2];
	_scrsize(s);
	COLS = s[0];
	LINES = s[1];

	if (getenv("WINDOWID")) {
	    FILE *fd = popen("scrsize", "rt");
	    if (fd) {
		fscanf(fd, "%i %i", &COLS, &LINES);
		pclose(fd);
	    }
	}
#ifndef JP_CHARSET
	else{
	    ULONG CpList[8],CpSize;
	    CodePage=-1;
	    if(!DosQueryCp(sizeof(CpList),CpList,&CpSize))
		CodePage=*CpList;
	}
#endif
    }
#elif defined(HAVE_TERMIOS_H) && defined(TIOCGWINSZ)
    struct winsize wins;

    i = ioctl(tty, TIOCGWINSZ, &wins);
    if (i >= 0 && wins.ws_row != 0 && wins.ws_col != 0) {
	LINES = wins.ws_row;
	COLS = wins.ws_col;
    }
#endif /* defined(HAVE-TERMIOS_H) && defined(TIOCGWINSZ) */
    if (LINES <= 0 &&
	(p = getenv("LINES")) != NULL &&
	(i = atoi(p)) >= 0)
	LINES = i;
    if (COLS <= 0 &&
	(p = getenv("COLUMNS")) != NULL &&
	(i = atoi(p)) >= 0)
	COLS = i;
    if (LINES <= 0)
	LINES = tgetnum("li");	/* number of line */
    if (COLS <= 0)
	COLS = tgetnum("co");	/* number of column */
    if (COLS > MAX_COLUMN)
	COLS = MAX_COLUMN;
    if (LINES > MAX_LINE)
	LINES = MAX_LINE;
}

void
setupscreen(void)
{
    int i;

    if (LINES + 1 > max_LINES) {
	max_LINES = LINES + 1;
	max_COLS = 0;
	ScreenElem = New_N(Screen, max_LINES);
	ScreenImage = New_N(Screen *, max_LINES);
    }
    if (COLS + 1 > max_COLS) {
	max_COLS = COLS + 1;
	for (i = 0; i < max_LINES; i++) {
	    ScreenElem[i].lineimage = NewAtom_N(char, max_COLS);
	    ScreenElem[i].lineprop = NewAtom_N(l_prop, max_COLS);
	}
    }
    for (i = 0; i < LINES; i++) {
	ScreenImage[i] = &ScreenElem[i];
	ScreenImage[i]->lineprop[0] = S_EOL;
	ScreenImage[i]->isdirty = 0;
    }
    for (; i < max_LINES; i++) {
	ScreenElem[i].isdirty = L_UNUSED;
    }

    clear();
}

/* 
 * Screen initialize
 */
int
initscr(void)
{
    if (set_tty() < 0)
	return -1;
    set_int();
    getTCstr();
    if (T_ti && !Do_not_use_ti_te)
	writestr(T_ti);
    setupscreen();
    return 0;
}

#ifdef JP_CHARSET
static int wmode = C_ASCII;
static char wbuf;
#endif

int
write1(char c)
{
#ifdef SCREEN_DEBUG
    usleep(50);
#endif				/* SCREEN_DEBUG */
#ifdef JP_CHARSET
    if (IS_KANJI(c)) {
	switch (wmode) {
	case C_ASCII:
	    switch_wchar(ttyf);
	case C_WCHAR2:
	    wmode = C_WCHAR1;
	    wbuf = c;
	    break;
	case C_WCHAR1:
	    wmode = C_WCHAR2;
	    putchars((unsigned char) wbuf, (unsigned char) c, ttyf);
	    break;
	}
    }
    else {
	switch (wmode) {
	case C_ASCII:
	    break;
	case C_WCHAR1:
	    /* ignore byte */
	    wmode = C_ASCII;
	    switch_ascii(ttyf);
	    break;
	case C_WCHAR2:
	    wmode = C_ASCII;
	    switch_ascii(ttyf);
	    break;
	}
	putc(c, ttyf);
    }
#else				/* not JP_CHARSET */
    putc(c, ttyf);
#endif				/* not JP_CHARSET */
#ifdef SCREEN_DEBUG
    fflush(ttyf);
#endif				/* SCREEN_DEBUG */
    return 0;
}

#ifdef JP_CHARSET
void
endline(void)
{				/* End of line */
    if (wmode != C_ASCII) {
	switch_ascii(ttyf);
	wmode = C_ASCII;
    }
}

void
switch_ascii(FILE * f)
{
    extern char *GetSOCode(char);
    if (CODE_JIS(DisplayCode)) {
	fputs(GetSOCode(DisplayCode), f);
    }
}

void
switch_wchar(FILE * f)
{
    extern char *GetSICode(char);
    if (CODE_JIS(DisplayCode)) {
	fputs(GetSICode(DisplayCode), f);
    }
}

void
putchars(unsigned char c1, unsigned char c2, FILE * f)
{
    Str s;
    char *p;

    switch (DisplayCode) {
    case CODE_EUC:
	putc(c1, f);
	putc(c2, f);
	return;
    case CODE_JIS_n:
    case CODE_JIS_m:
    case CODE_JIS_N:
    case CODE_JIS_j:
    case CODE_JIS_J:
	putc(c1 & 0x7f, f);
	putc(c2 & 0x7f, f);
	return;
    case CODE_SJIS:
	s = Strnew_size(3);
	put_sjis(s, c1 & 0x7f, c2 & 0x7f);
	break;
    }
    if (! s->length) {
	putc('?', f);
	putc('?', f);
	return;
    }
    for (p = s->ptr; *p != '\0'; p++)
	putc(*p, f);
}
#endif				/* JP_CHARSET */

void
move(int line, int column)
{
    if (line >= 0 && line < LINES)
	CurLine = line;
    if (column >= 0 && column < COLS)
	CurColumn = column;
}

#ifdef USE_BG_COLOR
#define M_SPACE (S_SCREENPROP|S_COLORED|S_BCOLORED|S_GRAPHICS)
#else				/* not USE_BG_COLOR */
#define M_SPACE (S_SCREENPROP|S_COLORED|S_GRAPHICS)
#endif				/* not USE_BG_COLOR */

static int
need_redraw(char c1, l_prop pr1, char c2, l_prop pr2)
{
    if (c1 != c2)
	return 1;
    if (c1 == ' ')
	return (pr1 ^ pr2) & M_SPACE & ~S_DIRTY;

    if ((pr1 ^ pr2) & ~S_DIRTY)
	return 1;

    return 0;
}

#define M_CEOL (~(M_SPACE|C_WHICHCHAR))

void
addch(char c)
{
    char *p;
    l_prop *pr;
    int dest, i;
    short *dirty;

    if (CurColumn == COLS)
	wrap();
    if (CurColumn >= COLS)
	return;
    p = ScreenImage[CurLine]->lineimage;
    pr = ScreenImage[CurLine]->lineprop;
    dirty = &ScreenImage[CurLine]->isdirty;

    /* Eliminate unprintables according to * iso-8859-*.
     * Particularly 0x96 messes up T.Dickey's * (xfree-)xterm */
    if (IS_INTERNAL(c))
	c = ' ';

    if (pr[CurColumn] & S_EOL) {
	if (c == ' ' &&
#ifdef JP_CHARSET
	    CHMODE(CurrentMode) != C_WCHAR1 &&
#endif				/* JP_CHARSET */
	    !(CurrentMode & M_SPACE)) {
	    CurColumn++;
	    return;
	}
	for (i = CurColumn; i >= 0 && (pr[i] & S_EOL); i--) {
	    p[i] = ' ';
	    SETPROP(pr[i], (pr[i] & M_CEOL) | C_ASCII);
	}
    }

    if (c == '\t' || c == '\n' || c == '\r' || c == '\b')
	SETCHMODE(CurrentMode, C_CTRL);
#ifdef JP_CHARSET
    else if (CHMODE(CurrentMode) == C_WCHAR1)
	SETCHMODE(CurrentMode, C_WCHAR2);
    else if (IS_KANJI1(c))
	SETCHMODE(CurrentMode, C_WCHAR1);
#endif				/* JP_CHARSET */
    else if (!IS_CNTRL(c))
	SETCHMODE(CurrentMode, C_ASCII);
    else
	return;

    /* Required to erase bold or underlined character for some * terminal
     * emulators. */
    if (((pr[CurColumn] & S_BOLD) &&
	 need_redraw(p[CurColumn], pr[CurColumn], c, CurrentMode)) ||
	((pr[CurColumn] & S_UNDERLINE) && !(CurrentMode & S_UNDERLINE))) {
	touch_line();
	if (CurColumn < COLS - 1) {
	    touch_column(CurColumn + 1);
	    if (pr[CurColumn + 1] & S_EOL) {
		p[CurColumn + 1] = ' ';
		SETPROP(pr[CurColumn + 1], (pr[CurColumn + 1] & M_CEOL) | C_ASCII);
	    }
#ifdef JP_CHARSET
	    else if (CHMODE(pr[CurColumn + 1]) == C_WCHAR1 && CurColumn < COLS - 2)
		touch_column(CurColumn + 2);
#endif				/* JP_CHARSET */
	}
    }

#ifdef JP_CHARSET
    if (CurColumn >= 1 && CHMODE(pr[CurColumn - 1]) == C_WCHAR1 &&
	CHMODE(CurrentMode) != C_WCHAR2) {
	p[CurColumn - 1] = ' ';
	SETPROP(pr[CurColumn - 1], (pr[CurColumn - 1] & ~C_WHICHCHAR) | C_ASCII);
	touch_line();
	touch_column(CurColumn - 1);
    }

    if (CurColumn < COLS - 1 && CHMODE(pr[CurColumn + 1]) == C_WCHAR2 &&
	CHMODE(CurrentMode) != C_WCHAR1) {
	p[CurColumn + 1] = ' ';
	SETPROP(pr[CurColumn + 1], (pr[CurColumn + 1] & ~C_WHICHCHAR) | C_ASCII);
	touch_line();
	touch_column(CurColumn + 1);
    }

    if (CurColumn == COLS - 1 && CHMODE(CurrentMode) == C_WCHAR1) {
	wrap();
	p = ScreenImage[CurLine]->lineimage;
	pr = ScreenImage[CurLine]->lineprop;
    }
#endif				/* JP_CHARSET */
    if (CHMODE(CurrentMode) != C_CTRL) {
	if (need_redraw(p[CurColumn], pr[CurColumn], c, CurrentMode)) {
	    p[CurColumn] = c;
	    SETPROP(pr[CurColumn], CurrentMode);
	    touch_line();
	    touch_column(CurColumn);
#ifdef JP_CHARSET
	    if (CHMODE(CurrentMode) == C_WCHAR1)
		touch_column(CurColumn + 1);
	    else if (CHMODE(CurrentMode) == C_WCHAR2)
		touch_column(CurColumn - 1);
#endif				/* JP_CHARSET */
	}
	CurColumn++;
    }
    else if (c == '\t') {
	dest = (CurColumn + tab_step) / tab_step * tab_step;
	if (dest >= COLS) {
	    wrap();
	    touch_line();
	    dest = tab_step;
	    p = ScreenImage[CurLine]->lineimage;
	    pr = ScreenImage[CurLine]->lineprop;
	}
	for (i = CurColumn; i < dest; i++) {
	    if (need_redraw(p[i], pr[i], ' ', CurrentMode)) {
		p[i] = ' ';
		SETPROP(pr[i], CurrentMode);
		touch_line();
		touch_column(i);
	    }
	}
	CurColumn = i;
    }
    else if (c == '\n') {
	wrap();
    }
    else if (c == '\r') {	/* Carriage return */
	CurColumn = 0;
    }
    else if (c == '\b' && CurColumn > 0) {	/* Backspace */
	CurColumn--;
#ifdef JP_CHARSET
	if (CurColumn > 0 &&
	    CHMODE(pr[CurColumn]) == C_WCHAR2)
	    CurColumn--;
#endif				/* JP_CHARSET */
    }
}

void
wrap(void)
{
    if (CurLine == LASTLINE)
	return;
    CurLine++;
    CurColumn = 0;
}

void
touch_column(int col)
{
    if (col >= 0 && col < COLS)
	ScreenImage[CurLine]->lineprop[col] |= S_DIRTY;
}

void
touch_line(void)
{
    if (!(ScreenImage[CurLine]->isdirty & L_DIRTY)) {
	int i;
	for (i = 0; i < COLS; i++)
	    ScreenImage[CurLine]->lineprop[i] &= ~S_DIRTY;
	ScreenImage[CurLine]->isdirty |= L_DIRTY;
    }

}

void
standout(void)
{
    CurrentMode |= S_STANDOUT;
}

void
standend(void)
{
    CurrentMode &= ~S_STANDOUT;
}

void
toggle_stand(void)
{
    l_prop *pr = ScreenImage[CurLine]->lineprop;
    pr[CurColumn] ^= S_STANDOUT;
#ifdef JP_CHARSET
    if (CHMODE(pr[CurColumn]) == C_WCHAR1)
	pr[CurColumn + 1] ^= S_STANDOUT;
#endif				/* JP_CHARSET */
}

void
bold(void)
{
    CurrentMode |= S_BOLD;
}

void
boldend(void)
{
    CurrentMode &= ~S_BOLD;
}

void
underline(void)
{
    CurrentMode |= S_UNDERLINE;
}

void
underlineend(void)
{
    CurrentMode &= ~S_UNDERLINE;
}

void
graphstart(void)
{
    CurrentMode |= S_GRAPHICS;
}

void
graphend(void)
{
    CurrentMode &= ~S_GRAPHICS;
}

int
graph_ok(void)
{
#ifndef KANJI_SYMBOLS
    if (no_graphic_char)
	return 0;
#endif				/* not KANJI_SYMBOLS */
    return T_as[0] != 0 && T_ae[0] != 0 && T_ac[0] != 0;
}

void
setfcolor(int color)
{
    CurrentMode &= ~COL_FCOLOR;
    if ((color & 0xf) <= 7)
	CurrentMode |= (((color & 7) | 8) << 8);
}

static char *
color_seq(int colmode)
{
    static char seqbuf[32];
    sprintf(seqbuf, "\033[%dm", ((colmode >> 8) & 7) + 30);
    return seqbuf;
}

#ifdef USE_BG_COLOR
void
setbcolor(int color)
{
    CurrentMode &= ~COL_BCOLOR;
    if ((color & 0xf) <= 7)
	CurrentMode |= (((color & 7) | 8) << 12);
}

static char *
bcolor_seq(int colmode)
{
    static char seqbuf[32];
    sprintf(seqbuf, "\033[%dm", ((colmode >> 12) & 7) + 40);
    return seqbuf;
}
#endif				/* USE_BG_COLOR */

#define RF_NEED_TO_MOVE    0
#define RF_CR_OK           1
#define RF_NONEED_TO_MOVE  2
#ifdef USE_BG_COLOR
#define M_MEND (S_STANDOUT|S_UNDERLINE|S_BOLD|S_COLORED|S_BCOLORED|S_GRAPHICS)
#else				/* not USE_BG_COLOR */
#define M_MEND (S_STANDOUT|S_UNDERLINE|S_BOLD|S_COLORED|S_GRAPHICS)
#endif				/* not USE_BG_COLOR */
void
refresh(void)
{
    int line, col, pcol;
    int pline = CurLine;
    int moved = RF_NEED_TO_MOVE;
    char *pc;
    l_prop *pr, mode = 0;
    l_prop color = COL_FTERM;
#ifdef USE_BG_COLOR
    l_prop bcolor = COL_BTERM;
#endif				/* USE_BG_COLOR */
    short *dirty;

    for (line = 0; line <= LASTLINE; line++) {
	dirty = &ScreenImage[line]->isdirty;
	if (*dirty & L_DIRTY) {
	    *dirty &= ~L_DIRTY;
	    pc = ScreenImage[line]->lineimage;
	    pr = ScreenImage[line]->lineprop;
	    for (col = 0; col < COLS && !(pr[col] & S_EOL); col++) {
		if (*dirty & L_NEED_CE && col >= ScreenImage[line]->eol) {
		    if (need_redraw(pc[col], pr[col], ' ', 0))
			break;
		}
		else {
		    if (pr[col] & S_DIRTY)
			break;
		}
	    }
	    if (*dirty & (L_NEED_CE | L_CLRTOEOL)) {
		pcol = ScreenImage[line]->eol;
		if (pcol >= COLS) {
		    *dirty &= ~(L_NEED_CE | L_CLRTOEOL);
		    pcol = col;
		}
	    }
	    else {
		pcol = col;
	    }
	    if (line < LINES - 2 && pline == line - 1 && pcol == 0) {
		switch (moved) {
		case RF_NEED_TO_MOVE:
		    MOVE(line, 0);
		    moved = RF_CR_OK;
		    break;
		case RF_CR_OK:
		    write1('\n');
		    write1('\r');
		    break;
		case RF_NONEED_TO_MOVE:
		    moved = RF_CR_OK;
		    break;
		}
	    }
	    else {
		MOVE(line, pcol);
		moved = RF_CR_OK;
	    }
	    if (*dirty & (L_NEED_CE | L_CLRTOEOL)) {
		writestr(T_ce);
		if (col != pcol)
		    MOVE(line, col);
	    }
	    pline = line;
	    pcol = col;
	    for (; col < COLS; col++) {
		if (pr[col] & S_EOL)
		    break;

		/* 
		 * some terminal emulators do linefeed when a
		 * character is put on COLS-th column. this behavior
		 * is different from one of vt100, but such terminal
		 * emulators are used as vt100-compatible
		 * emulators. This behaviour causes scroll when a
		 * character is drawn on (COLS-1,LINES-1) point.  To
		 * avoid the scroll, I prohibit to draw character on
		 * (COLS-1,LINES-1).
		 */
#if !defined(USE_BG_COLOR) || defined(__CYGWIN__)
#if defined(__CYGWIN__) && LANG == JA
		if (isWinConsole)
#endif				/* defined(__CYGWIN__) && LANG == JA */
		if (line == LINES - 1 && col == COLS - 1)
		    break;
#endif			/* !defined(USE_BG_COLOR) || defined(__CYGWIN__) */
		if ((!(pr[col] & S_STANDOUT) && (mode & S_STANDOUT)) ||
		    (!(pr[col] & S_UNDERLINE) && (mode & S_UNDERLINE)) ||
		    (!(pr[col] & S_BOLD) && (mode & S_BOLD)) ||
		    (!(pr[col] & S_COLORED) && (mode & S_COLORED))
#ifdef USE_BG_COLOR
		    || (!(pr[col] & S_BCOLORED) && (mode & S_BCOLORED))
#endif				/* USE_BG_COLOR */
		    || (!(pr[col] & S_GRAPHICS) && (mode & S_GRAPHICS))) {
            if ((mode & S_COLORED)
#ifdef USE_BG_COLOR
              || (mode & S_BCOLORED)
#endif				/* USE_BG_COLOR */
			)
			writestr(T_op);
            if (mode & S_GRAPHICS)
			writestr(T_ae);
		    writestr(T_me);
		    mode &= ~M_MEND;
		}
		if ((*dirty & L_NEED_CE && col >= ScreenImage[line]->eol) ?
		    need_redraw(pc[col], pr[col], ' ', 0) : (pr[col] & S_DIRTY)) {
		    if (pcol == col - 1)
			writestr(T_nd);
		    else if (pcol != col)
			MOVE(line, col);

		    if ((pr[col] & S_STANDOUT) && !(mode & S_STANDOUT)) {
			writestr(T_so);
			mode |= S_STANDOUT;
		    }
		    if ((pr[col] & S_UNDERLINE) && !(mode & S_UNDERLINE)) {
			writestr(T_us);
			mode |= S_UNDERLINE;
		    }
		    if ((pr[col] & S_BOLD) && !(mode & S_BOLD)) {
			writestr(T_md);
			mode |= S_BOLD;
		    }
            if ((pr[col] & S_COLORED) && (pr[col] ^ mode) & COL_FCOLOR) {
               color = (pr[col] & COL_FCOLOR);
               mode = ((mode & ~COL_FCOLOR) | color);
               writestr(color_seq(color));
            }
#ifdef USE_BG_COLOR
            if ((pr[col] & S_BCOLORED) && (pr[col] ^ mode) & COL_BCOLOR) {
               bcolor = (pr[col] & COL_BCOLOR);
               mode = ((mode & ~COL_BCOLOR) | bcolor);
               writestr(bcolor_seq(bcolor));
            }
#endif                /* USE_BG_COLOR */
		    if ((pr[col] & S_GRAPHICS) && !(mode & S_GRAPHICS)) {
			if (!graph_enabled) {
			    graph_enabled = 1;
			    writestr(T_eA);
			}
			writestr(T_as);
			mode |= S_GRAPHICS;
		    }
		    write1((pr[col] & S_GRAPHICS) ? graphchar(pc[col]) : pc[col]);
		    pcol = col + 1;
		}
	    }
	    if (col == COLS)
		moved = RF_NEED_TO_MOVE;
	    for (; col < COLS && !(pr[col] & S_EOL); col++)
		pr[col] |= S_EOL;
	}
	*dirty &= ~(L_NEED_CE | L_CLRTOEOL);
	if (mode & M_MEND) {
	    if (mode & (S_COLORED
#ifdef USE_BG_COLOR
			| S_BCOLORED
#endif				/* USE_BG_COLOR */
		))
		writestr(T_op);
	    if (mode & S_GRAPHICS)
		writestr(T_ae);
	    writestr(T_me);
	    mode &= ~M_MEND;
	}
#ifdef JP_CHARSET
	endline();
#endif				/* JP_CHARSET */
    }
    MOVE(CurLine, CurColumn);
    fflush(ttyf);
}

void
clear(void)
{
    int i, j;
    l_prop *p;
    writestr(T_cl);
    move(0, 0);
    for (i = 0; i < LINES; i++) {
	ScreenImage[i]->isdirty = 0;
	p = ScreenImage[i]->lineprop;
	for (j = 0; j < COLS; j++) {
	    p[j] = S_EOL;
	}
    }
    CurrentMode = C_ASCII;
}

static void
scroll_raw(void)
{				/* raw scroll */
    MOVE(LINES - 1, 0);
    write1('\n');
}

void
scroll(int n)
{				/* scroll up */
    int cli = CurLine, cco = CurColumn;
    Screen *t;
    int i, j, k;

    i = LINES;
    j = n;
    do {
	k = j;
	j = i % k;
	i = k;
    } while (j);
    do {
	k--;
	i = k;
	j = (i + n) % LINES;
	t = ScreenImage[k];
	while (j != k) {
	    ScreenImage[i] = ScreenImage[j];
	    i = j;
	    j = (i + n) % LINES;
	}
	ScreenImage[i] = t;
    } while (k);

    for (i = 0; i < n; i++) {
	t = ScreenImage[LINES - 1 - i];
	t->isdirty = 0;
	for (j = 0; j < COLS; j++)
	    t->lineprop[j] = S_EOL;
	scroll_raw();
    }
    move(cli, cco);
}

void
rscroll(int n)
{				/* scroll down */
    int cli = CurLine, cco = CurColumn;
    Screen *t;
    int i, j, k;

    i = LINES;
    j = n;
    do {
	k = j;
	j = i % k;
	i = k;
    } while (j);
    do {
	k--;
	i = k;
	j = (LINES + i - n) % LINES;
	t = ScreenImage[k];
	while (j != k) {
	    ScreenImage[i] = ScreenImage[j];
	    i = j;
	    j = (LINES + i - n) % LINES;
	}
	ScreenImage[i] = t;
    } while (k);
    if (T_sr && *T_sr) {
	MOVE(0, 0);
	for (i = 0; i < n; i++) {
	    t = ScreenImage[i];
	    t->isdirty = 0;
	    for (j = 0; j < COLS; j++)
		t->lineprop[j] = S_EOL;
	    writestr(T_sr);
	}
	move(cli, cco);
    }
    else {
	for (i = 0; i < LINES; i++) {
	    t = ScreenImage[i];
	    t->isdirty |= L_DIRTY | L_NEED_CE;
	    for (j = 0; j < COLS; j++) {
		t->lineprop[j] |= S_DIRTY;
	    }
	}
    }
}

#if 0
void
need_clrtoeol(void)
{
    /* Clear to the end of line as the need arises */
    l_prop *lprop = ScreenImage[CurLine]->lineprop;

    if (lprop[CurColumn] & S_EOL)
	return;

    if (!(ScreenImage[CurLine]->isdirty & (L_NEED_CE | L_CLRTOEOL)) ||
	ScreenImage[CurLine]->eol > CurColumn)
	ScreenImage[CurLine]->eol = CurColumn;

    ScreenImage[CurLine]->isdirty |= L_NEED_CE;
}
#endif				/* 0 */

void
clrtoeol(void)
{				/* Clear to the end of line */
    int i;
    l_prop *lprop = ScreenImage[CurLine]->lineprop;

    if (lprop[CurColumn] & S_EOL)
	return;

    if (!(ScreenImage[CurLine]->isdirty & (L_NEED_CE | L_CLRTOEOL)) ||
	ScreenImage[CurLine]->eol > CurColumn)
	ScreenImage[CurLine]->eol = CurColumn;

    ScreenImage[CurLine]->isdirty |= L_CLRTOEOL;
    touch_line();
    for (i = CurColumn; i < COLS && !(lprop[i] & S_EOL); i++) {
	lprop[i] = S_EOL | S_DIRTY;
    }
}

#ifdef USE_BG_COLOR
void
clrtoeol_with_bcolor(void)
{
    int i, cli, cco;
    l_prop pr;

    if (!(CurrentMode & S_BCOLORED)) {
	clrtoeol();
	return;
    }
    cli = CurLine;
    cco = CurColumn;
    pr = CurrentMode;
    CurrentMode = (CurrentMode & (M_CEOL | S_BCOLORED)) | C_ASCII;
    for (i = CurColumn; i < COLS; i++)
	addch(' ');
    move(cli, cco);
    CurrentMode = pr;
}

void
clrtoeolx(void)
{
    clrtoeol_with_bcolor();
}
#else				/* not USE_BG_COLOR */

void
clrtoeolx(void)
{
    clrtoeol();
}
#endif				/* not USE_BG_COLOR */

void
clrtobot_eol(void (*clrtoeol) ())
{
    int l, c;

    l = CurLine;
    c = CurColumn;
    (*clrtoeol) ();
    CurColumn = 0;
    CurLine++;
    for (; CurLine < LINES; CurLine++)
	(*clrtoeol) ();
    CurLine = l;
    CurColumn = c;
}

void
clrtobot(void)
{
    clrtobot_eol(clrtoeol);
}

void
clrtobotx(void)
{
    clrtobot_eol(clrtoeolx);
}

#if 0
void
no_clrtoeol(void)
{
    int i;
    l_prop *lprop = ScreenImage[CurLine]->lineprop;

    ScreenImage[CurLine]->isdirty &= ~L_CLRTOEOL;
}
#endif				/* 0 */

void
addstr(char *s)
{
    while (*s != '\0')
	addch(*(s++));
}

void
addnstr(char *s, int n)
{
    int i;

#ifdef JP_CHARSET
    for (i = 0; i < n - 1 && *s != '\0'; i++)
	addch(*(s++));
    if (*s != '\0') {
	if (IS_KANJI2(*s)) {
	    /* WCHAR */
	    if (CHMODE(CurrentMode) == C_WCHAR1) {
		/* WCHAR second byte */
		addch(*s);
	    }
	}
	else {
	    /* Ascii or WCHAR2 */
	    addch(*s);
	}
    }
#else				/* not JP_CHARSET */
    for (i = 0; i < n && *s != '\0'; i++)
	addch(*(s++));
#endif				/* not JP_CHARSET */
}

void
addnstr_sup(char *s, int n)
{
    int i;

#ifdef JP_CHARSET
    for (i = 0; i < n - 1 && *s != '\0'; i++)
	addch(*(s++));
    if (*s != '\0') {
	if (IS_KANJI2(*s)) {
	    /* WCHAR */
	    if (CHMODE(CurrentMode) == C_WCHAR1) {
		/* WCHAR second byte */
		addch(*s);
		i++;
	    }
	}
	else {
	    /* Ascii or WCHAR2 */
	    addch(*s);
	    i++;
	}
    }
#else				/* not JP_CHARSET */
    for (i = 0; i < n && *s != '\0'; i++)
	addch(*(s++));
#endif				/* not JP_CHARSET */
    for (; i < n; i++)
	addch(' ');
}

void
crmode(void)
#ifndef HAVE_SGTTY_H
{
    ttymode_reset(ICANON, IXON);
    ttymode_set(ISIG, 0);
#ifdef HAVE_TERMIOS_H
    set_cc(VMIN, 1);
#else				/* not HAVE_TERMIOS_H */
    set_cc(VEOF, 1);
#endif				/* not HAVE_TERMIOS_H */
}
#else				/* HAVE_SGTTY_H */
{
    ttymode_set(CBREAK, 0);
}
#endif				/* HAVE_SGTTY_H */

void
nocrmode(void)
#ifndef HAVE_SGTTY_H
{
    ttymode_set(ICANON, 0);
#ifdef HAVE_TERMIOS_H
    set_cc(VMIN, 4);
#else				/* not HAVE_TERMIOS_H */
    set_cc(VEOF, 4);
#endif				/* not HAVE_TERMIOS_H */
}
#else				/* HAVE_SGTTY_H */
{
    ttymode_reset(CBREAK, 0);
}
#endif				/* HAVE_SGTTY_H */

void
term_echo(void)
{
    ttymode_set(ECHO, 0);
}

void
term_noecho(void)
{
    ttymode_reset(ECHO, 0);
}

void
term_raw(void)
#ifndef HAVE_SGTTY_H
#ifdef IEXTEN
#define TTY_MODE ISIG|ICANON|ECHO|IEXTEN
#else				/* not IEXTEN */
#define TTY_MODE ISIG|ICANON|ECHO
#endif				/* not IEXTEN */
{
    ttymode_reset(TTY_MODE, IXON | IXOFF);
#ifdef HAVE_TERMIOS_H
    set_cc(VMIN, 1);
#else				/* not HAVE_TERMIOS_H */
    set_cc(VEOF, 1);
#endif				/* not HAVE_TERMIOS_H */
}
#else				/* HAVE_SGTTY_H */
{
    ttymode_set(RAW, 0);
}
#endif				/* HAVE_SGTTY_H */

void
term_cooked(void)
#ifndef HAVE_SGTTY_H
{
#ifdef __EMX__
    /* On XFree86/OS2, some scrambled characters
     * will appear when asserting IEXTEN flag.
     */
    ttymode_set((TTY_MODE)&~IEXTEN,0);
#else
    ttymode_set(TTY_MODE, 0);
#endif
#ifdef HAVE_TERMIOS_H
    set_cc(VMIN, 4);
#else				/* not HAVE_TERMIOS_H */
    set_cc(VEOF, 4);
#endif				/* not HAVE_TERMIOS_H */
}
#else				/* HAVE_SGTTY_H */
{
    ttymode_reset(RAW, 0);
}
#endif				/* HAVE_SGTTY_H */

void
term_cbreak(void)
{
    term_cooked();
    term_noecho();
}

char
getch(void)
{
    char c;

    while (read(tty, &c, 1) < (int)1) {
        if (errno == EINTR || errno == EAGAIN) continue;
        /* error happend on read(2) */
        quitfm();
        break;  /* unreachable */
    }
    return c;
}

#ifdef USE_MOUSE
#ifdef USE_GPM
char
wgetch(void)
{
    char c;

    read(tty, &c, 1);
    return c;
}

int
do_getch()
{
    if (is_xterm)
	return getch();
    else
	return Gpm_Getch();
}
#endif				/* USE_GPM */

#ifdef USE_SYSMOUSE
int
sysm_getch()
{
    fd_set rfd;
    int key, x, y;

    FD_ZERO(&rfd);
    FD_SET(tty, &rfd);
    while (select(tty + 1, &rfd, NULL, NULL, NULL) <= 0) {
	if (errno == EINTR) {
	    x = xpix / cwidth;
	    y = ypix / cheight;
	    key = (*sysm_handler) (x, y, nbs, obs);
	    if (key != 0)
		return key;
	}
    }
    return getch();
}

int
do_getch()
{
    if (is_xterm || ! sysm_handler)
	return getch();
    else
	return sysm_getch();
}

MySignalHandler
sysmouse(SIGNAL_ARG)
{
    struct mouse_info mi;

    mi.operation = MOUSE_GETINFO;
    if (ioctl(tty, CONS_MOUSECTL, &mi) == -1)
	return;
    xpix = mi.u.data.x;
    ypix = mi.u.data.y;
    obs = nbs;
    nbs = mi.u.data.buttons & 0x7;
    /* for cosmetic bug in syscons.c on FreeBSD 3.[34] */
    mi.operation = MOUSE_HIDE;
    ioctl(tty, CONS_MOUSECTL, &mi);
    mi.operation = MOUSE_SHOW;
    ioctl(tty, CONS_MOUSECTL, &mi);
}
#endif				/* USE_SYSMOUSE */
#endif				/* USE_MOUSE */

void
bell(void)
{
    write1(7);
}

void
skip_escseq(void)
{
    int c;

    c = getch();
    if (c == '[' || c == 'O') {
	c = getch();
#ifdef USE_MOUSE
	if (is_xterm && c == 'M') {
	  getch();
	  getch();
	  getch();
	}
	else
#endif	
	while (IS_DIGIT(c))
	    c = getch();
    }
}

void
sleep_till_anykey(int sec, int purge)
{
    fd_set rfd;
    struct timeval tim;
    int er, c;
    TerminalMode ioval;

    TerminalGet(tty, &ioval);
    term_raw();

    tim.tv_sec = sec;
    tim.tv_usec = 0;

    FD_ZERO(&rfd);
    FD_SET(tty, &rfd);

    if (select(tty + 1, &rfd, 0, 0, &tim) > 0 && purge) {
	c = getch();
	if (c == ESC_CODE)
	    skip_escseq();
    }
    er = TerminalSet(tty, &ioval);
    if (er == -1) {
	printf("Error occured: errno=%d\n", errno);
	reset_exit(SIGNAL_ARGLIST);
    }
}

#ifdef USE_MOUSE

#define XTERM_ON   {fputs("\033[?1001s\033[?1000h",ttyf); flush_tty();}
#define XTERM_OFF  {fputs("\033[?1000l\033[?1001r",ttyf); flush_tty();}

#ifdef USE_GPM
/* Linux console with GPM support */

void
mouse_init()
{
    Gpm_Connect conn;
    extern int gpm_process_mouse(Gpm_Event *, void *);

    if (mouseActive)
	return;
    conn.eventMask = ~0;
    conn.defaultMask = 0;
    conn.maxMod = 0;
    conn.minMod = 0;
    if (Gpm_Open(&conn, 0) == -2) {
        /*
	 * If Gpm_Open() success, returns >= 0
	 * Gpm_Open() returns -2 in case of xterm.
	 * Gpm_Close() is necessary here. Otherwise,
	 * xterm is being left in the mode where the mouse clicks are
	 * passed through to the application.
	 */
	Gpm_Close();
	is_xterm = 1;
    } else {
	gpm_handler = gpm_process_mouse;
    }
    if (is_xterm) {
	XTERM_ON;
    }
    mouseActive = 1;
}

void
mouse_end()
{
    if (mouseActive == 0)
	return;
    if (is_xterm) {
	XTERM_OFF;
    }
    else
	Gpm_Close();
    mouseActive = 0;
}

#elif	defined(USE_SYSMOUSE)
/* *BSD console with sysmouse support */
void
mouse_init()
{
    mouse_info_t mi;
    extern int sysm_process_mouse();

    if (mouseActive)
	return;
    if (is_xterm) {
	XTERM_ON;
    }
    else {
#if defined(FBIO_MODEINFO) || defined(CONS_MODEINFO)	/* FreeBSD > 2.x */
#ifndef FBIO_GETMODE		/* FreeBSD 3.x */
#define FBIO_GETMODE    CONS_GET
#define FBIO_MODEINFO   CONS_MODEINFO
#endif				/* FBIO_GETMODE */
	video_info_t vi;

	if (ioctl(tty, FBIO_GETMODE, &vi.vi_mode) != -1 &&
	    ioctl(tty, FBIO_MODEINFO, &vi) != -1) {
	    cwidth = vi.vi_cwidth;
	    cheight = vi.vi_cheight;
	}
#endif				/* defined(FBIO_MODEINFO) ||
				 * defined(CONS_MODEINFO) */
	signal(SIGUSR2, SIG_IGN);
	mi.operation = MOUSE_MODE;
	mi.u.mode.mode = 0;
	mi.u.mode.signal = SIGUSR2;
       sysm_handler = NULL;
	if (ioctl(tty, CONS_MOUSECTL, &mi) != -1) {
	    signal(SIGUSR2, sysmouse);
	    mi.operation = MOUSE_SHOW;
	    ioctl(tty, CONS_MOUSECTL, &mi);
	    sysm_handler = sysm_process_mouse;
	}
    }
    mouseActive = 1;
}

void
mouse_end()
{
    if (mouseActive == 0)
	return;
    if (is_xterm) {
	XTERM_OFF;
    }
    else {
	mouse_info_t mi;
	mi.operation = MOUSE_MODE;
	mi.u.mode.mode = 0;
	mi.u.mode.signal = 0;
	ioctl(tty, CONS_MOUSECTL, &mi);
    }
    mouseActive = 0;
}

#else
/* not GPM nor SYSMOUSE, but use mouse with xterm */

void
mouse_init()
{
    if (mouseActive)
	return;
    if (is_xterm) {
	XTERM_ON;
    }
    mouseActive = 1;
}

void
mouse_end()
{
    if (mouseActive == 0)
	return;
    if (is_xterm) {
	XTERM_OFF;
    }
    mouseActive = 0;
}

#endif				/* not USE_GPM nor USE_SYSMOUSE */


void
mouse_active()
{
    if (!mouseActive)
	mouse_init();
}

void
mouse_inactive()
{
    if (mouseActive && is_xterm)
	mouse_end();
}

#endif				/* USE_MOUSE */

void
flush_tty()
{
    fflush(ttyf);
}