[dragonfly.git] / contrib / less / screen.c

/*
 * Copyright (C) 1984-2014  Mark Nudelman
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Less License, as specified in the README file.
 *
 * For more information, see the README file.
 */


/*
 * Routines which deal with the characteristics of the terminal.
 * Uses termcap to be as terminal-independent as possible.
 */

#include "less.h"
#include "cmd.h"

#if MSDOS_COMPILER
#include "pckeys.h"
#if MSDOS_COMPILER==MSOFTC
#include <graph.h>
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#include <conio.h>
#if MSDOS_COMPILER==DJGPPC
#include <pc.h>
extern int fd0;
#endif
#else
#if MSDOS_COMPILER==WIN32C
#include <windows.h>
#endif
#endif
#endif
#include <time.h>

#else

#if HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
#include <termios.h>
#else
#if HAVE_TERMIO_H
#include <termio.h>
#else
#if HAVE_SGSTAT_H
#include <sgstat.h>
#else
#include <sgtty.h>
#endif
#endif
#endif

#if HAVE_TERMCAP_H
#include <termcap.h>
#endif
#ifdef _OSK
#include <signal.h>
#endif
#if OS2
#include <sys/signal.h>
#include "pckeys.h"
#endif
#if HAVE_SYS_STREAM_H
#include <sys/stream.h>
#endif
#if HAVE_SYS_PTEM_H
#include <sys/ptem.h>
#endif

#endif /* MSDOS_COMPILER */

/*
 * Check for broken termios package that forces you to manually
 * set the line discipline.
 */
#ifdef __ultrix__
#define MUST_SET_LINE_DISCIPLINE 1
#else
#define MUST_SET_LINE_DISCIPLINE 0
#endif

#if OS2
#define DEFAULT_TERM            "ansi"
static char *windowid;
#else
#define DEFAULT_TERM            "unknown"
#endif

#if MSDOS_COMPILER==MSOFTC
static int videopages;
static long msec_loops;
static int flash_created = 0;
#define SETCOLORS(fg,bg)        { _settextcolor(fg); _setbkcolor(bg); }
#endif

#if MSDOS_COMPILER==BORLANDC
static unsigned short *whitescreen;
static int flash_created = 0;
#endif
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
#define _settextposition(y,x)   gotoxy(x,y)
#define _clearscreen(m)         clrscr()
#define _outtext(s)             cputs(s)
#define SETCOLORS(fg,bg)        { textcolor(fg); textbackground(bg); }
extern int sc_height;
#endif

#if MSDOS_COMPILER==WIN32C
struct keyRecord
{
        int ascii;
        int scan;
} currentKey;

static int keyCount = 0;
static WORD curr_attr;
static int pending_scancode = 0;
static WORD *whitescreen;

static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */
static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */
HANDLE con_out = INVALID_HANDLE_VALUE;             /* current console */

extern int quitting;
static void win32_init_term();
static void win32_deinit_term();

#define FG_COLORS       (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY)
#define BG_COLORS       (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY)
#define MAKEATTR(fg,bg)         ((WORD)((fg)|((bg)<<4)))
#define SETCOLORS(fg,bg)        { curr_attr = MAKEATTR(fg,bg); \
                                if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \
                                error("SETCOLORS failed"); }
#endif

#if MSDOS_COMPILER
public int nm_fg_color;         /* Color of normal text */
public int nm_bg_color;
public int bo_fg_color;         /* Color of bold text */
public int bo_bg_color;
public int ul_fg_color;         /* Color of underlined text */
public int ul_bg_color;
public int so_fg_color;         /* Color of standout text */
public int so_bg_color;
public int bl_fg_color;         /* Color of blinking text */
public int bl_bg_color;
static int sy_fg_color;         /* Color of system text (before less) */
static int sy_bg_color;

#else

/*
 * Strings passed to tputs() to do various terminal functions.
 */
static char
        *sc_pad,                /* Pad string */
        *sc_home,               /* Cursor home */
        *sc_addline,            /* Add line, scroll down following lines */
        *sc_lower_left,         /* Cursor to last line, first column */
        *sc_return,             /* Cursor to beginning of current line */
        *sc_move,               /* General cursor positioning */
        *sc_clear,              /* Clear screen */
        *sc_eol_clear,          /* Clear to end of line */
        *sc_eos_clear,          /* Clear to end of screen */
        *sc_s_in,               /* Enter standout (highlighted) mode */
        *sc_s_out,              /* Exit standout mode */
        *sc_u_in,               /* Enter underline mode */
        *sc_u_out,              /* Exit underline mode */
        *sc_b_in,               /* Enter bold mode */
        *sc_b_out,              /* Exit bold mode */
        *sc_bl_in,              /* Enter blink mode */
        *sc_bl_out,             /* Exit blink mode */
        *sc_visual_bell,        /* Visual bell (flash screen) sequence */
        *sc_backspace,          /* Backspace cursor */
        *sc_s_keypad,           /* Start keypad mode */
        *sc_e_keypad,           /* End keypad mode */
        *sc_init,               /* Startup terminal initialization */
        *sc_deinit;             /* Exit terminal de-initialization */
#endif

static int init_done = 0;

public int auto_wrap;           /* Terminal does \r\n when write past margin */
public int ignaw;               /* Terminal ignores \n immediately after wrap */
public int erase_char;          /* The user's erase char */
public int erase2_char;         /* The user's other erase char */
public int kill_char;           /* The user's line-kill char */
public int werase_char;         /* The user's word-erase char */
public int sc_width, sc_height; /* Height & width of screen */
public int bo_s_width, bo_e_width;      /* Printing width of boldface seq */
public int ul_s_width, ul_e_width;      /* Printing width of underline seq */
public int so_s_width, so_e_width;      /* Printing width of standout seq */
public int bl_s_width, bl_e_width;      /* Printing width of blink seq */
public int above_mem, below_mem;        /* Memory retained above/below screen */
public int can_goto_line;               /* Can move cursor to any line */
public int clear_bg;            /* Clear fills with background color */
public int missing_cap = 0;     /* Some capability is missing */

static int attrmode = AT_NORMAL;
extern int binattr;

#if !MSDOS_COMPILER
static char *cheaper();
static void tmodes();
#endif

/*
 * These two variables are sometimes defined in,
 * and needed by, the termcap library.
 */
#if MUST_DEFINE_OSPEED
extern short ospeed;    /* Terminal output baud rate */
extern char PC;         /* Pad character */
#endif
#ifdef _OSK
short ospeed;
char PC_, *UP, *BC;
#endif

extern int quiet;               /* If VERY_QUIET, use visual bell for bell */
extern int no_back_scroll;
extern int swindow;
extern int no_init;
extern int no_keypad;
extern int sigs;
extern int wscroll;
extern int screen_trashed;
extern int tty;
extern int top_scroll;
extern int oldbot;
#if HILITE_SEARCH
extern int hilite_search;
#endif

extern char *tgetstr();
extern char *tgoto();


/*
 * Change terminal to "raw mode", or restore to "normal" mode.
 * "Raw mode" means 
 *      1. An outstanding read will complete on receipt of a single keystroke.
 *      2. Input is not echoed.  
 *      3. On output, \n is mapped to \r\n.
 *      4. \t is NOT expanded into spaces.
 *      5. Signal-causing characters such as ctrl-C (interrupt),
 *         etc. are NOT disabled.
 * It doesn't matter whether an input \n is mapped to \r, or vice versa.
 */
        public void
raw_mode(on)
        int on;
{
        static int curr_on = 0;

        if (on == curr_on)
                return;
        erase2_char = '\b'; /* in case OS doesn't know about erase2 */
#if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS
    {
        struct termios s;
        static struct termios save_term;
        static int saved_term = 0;

        if (on) 
        {
                /*
                 * Get terminal modes.
                 */
                tcgetattr(tty, &s);

                /*
                 * Save modes and set certain variables dependent on modes.
                 */
                if (!saved_term)
                {
                        save_term = s;
                        saved_term = 1;
                }
#if HAVE_OSPEED
                switch (cfgetospeed(&s))
                {
#ifdef B0
                case B0: ospeed = 0; break;
#endif
#ifdef B50
                case B50: ospeed = 1; break;
#endif
#ifdef B75
                case B75: ospeed = 2; break;
#endif
#ifdef B110
                case B110: ospeed = 3; break;
#endif
#ifdef B134
                case B134: ospeed = 4; break;
#endif
#ifdef B150
                case B150: ospeed = 5; break;
#endif
#ifdef B200
                case B200: ospeed = 6; break;
#endif
#ifdef B300
                case B300: ospeed = 7; break;
#endif
#ifdef B600
                case B600: ospeed = 8; break;
#endif
#ifdef B1200
                case B1200: ospeed = 9; break;
#endif
#ifdef B1800
                case B1800: ospeed = 10; break;
#endif
#ifdef B2400
                case B2400: ospeed = 11; break;
#endif
#ifdef B4800
                case B4800: ospeed = 12; break;
#endif
#ifdef B9600
                case B9600: ospeed = 13; break;
#endif
#ifdef EXTA
                case EXTA: ospeed = 14; break;
#endif
#ifdef EXTB
                case EXTB: ospeed = 15; break;
#endif
#ifdef B57600
                case B57600: ospeed = 16; break;
#endif
#ifdef B115200
                case B115200: ospeed = 17; break;
#endif
                default: ;
                }
#endif
                erase_char = s.c_cc[VERASE];
#ifdef VERASE2
                erase2_char = s.c_cc[VERASE2];
#endif
                kill_char = s.c_cc[VKILL];
#ifdef VWERASE
                werase_char = s.c_cc[VWERASE];
#else
                werase_char = CONTROL('W');
#endif

                /*
                 * Set the modes to the way we want them.
                 */
                s.c_lflag &= ~(0
#ifdef ICANON
                        | ICANON
#endif
#ifdef ECHO
                        | ECHO
#endif
#ifdef ECHOE
                        | ECHOE
#endif
#ifdef ECHOK
                        | ECHOK
#endif
#if ECHONL
                        | ECHONL
#endif
                );

                s.c_oflag |= (0
#ifdef OXTABS
                        | OXTABS
#else
#ifdef TAB3
                        | TAB3
#else
#ifdef XTABS
                        | XTABS
#endif
#endif
#endif
#ifdef OPOST
                        | OPOST
#endif
#ifdef ONLCR
                        | ONLCR
#endif
                );

                s.c_oflag &= ~(0
#ifdef ONOEOT
                        | ONOEOT
#endif
#ifdef OCRNL
                        | OCRNL
#endif
#ifdef ONOCR
                        | ONOCR
#endif
#ifdef ONLRET
                        | ONLRET
#endif
                );
                s.c_cc[VMIN] = 1;
                s.c_cc[VTIME] = 0;
#ifdef VLNEXT
                s.c_cc[VLNEXT] = 0;
#endif
#ifdef VDSUSP
                s.c_cc[VDSUSP] = 0;
#endif
#if MUST_SET_LINE_DISCIPLINE
                /*
                 * System's termios is broken; need to explicitly 
                 * request TERMIODISC line discipline.
                 */
                s.c_line = TERMIODISC;
#endif
        } else
        {
                /*
                 * Restore saved modes.
                 */
                s = save_term;
        }
#if HAVE_FSYNC
        fsync(tty);
#endif
        tcsetattr(tty, TCSADRAIN, &s);
#if MUST_SET_LINE_DISCIPLINE
        if (!on)
        {
                /*
                 * Broken termios *ignores* any line discipline
                 * except TERMIODISC.  A different old line discipline
                 * is therefore not restored, yet.  Restore the old
                 * line discipline by hand.
                 */
                ioctl(tty, TIOCSETD, &save_term.c_line);
        }
#endif
    }
#else
#ifdef TCGETA
    {
        struct termio s;
        static struct termio save_term;
        static int saved_term = 0;

        if (on)
        {
                /*
                 * Get terminal modes.
                 */
                ioctl(tty, TCGETA, &s);

                /*
                 * Save modes and set certain variables dependent on modes.
                 */
                if (!saved_term)
                {
                        save_term = s;
                        saved_term = 1;
                }
#if HAVE_OSPEED
                ospeed = s.c_cflag & CBAUD;
#endif
                erase_char = s.c_cc[VERASE];
                kill_char = s.c_cc[VKILL];
#ifdef VWERASE
                werase_char = s.c_cc[VWERASE];
#else
                werase_char = CONTROL('W');
#endif

                /*
                 * Set the modes to the way we want them.
                 */
                s.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL);
                s.c_oflag |=  (OPOST|ONLCR|TAB3);
                s.c_oflag &= ~(OCRNL|ONOCR|ONLRET);
                s.c_cc[VMIN] = 1;
                s.c_cc[VTIME] = 0;
        } else
        {
                /*
                 * Restore saved modes.
                 */
                s = save_term;
        }
        ioctl(tty, TCSETAW, &s);
    }
#else
#ifdef TIOCGETP
    {
        struct sgttyb s;
        static struct sgttyb save_term;
        static int saved_term = 0;

        if (on)
        {
                /*
                 * Get terminal modes.
                 */
                ioctl(tty, TIOCGETP, &s);

                /*
                 * Save modes and set certain variables dependent on modes.
                 */
                if (!saved_term)
                {
                        save_term = s;
                        saved_term = 1;
                }
#if HAVE_OSPEED
                ospeed = s.sg_ospeed;
#endif
                erase_char = s.sg_erase;
                kill_char = s.sg_kill;
                werase_char = CONTROL('W');

                /*
                 * Set the modes to the way we want them.
                 */
                s.sg_flags |= CBREAK;
                s.sg_flags &= ~(ECHO|XTABS);
        } else
        {
                /*
                 * Restore saved modes.
                 */
                s = save_term;
        }
        ioctl(tty, TIOCSETN, &s);
    }
#else
#ifdef _OSK
    {
        struct sgbuf s;
        static struct sgbuf save_term;
        static int saved_term = 0;

        if (on)
        {
                /*
                 * Get terminal modes.
                 */
                _gs_opt(tty, &s);

                /*
                 * Save modes and set certain variables dependent on modes.
                 */
                if (!saved_term)
                {
                        save_term = s;
                        saved_term = 1;
                }
                erase_char = s.sg_bspch;
                kill_char = s.sg_dlnch;
                werase_char = CONTROL('W');

                /*
                 * Set the modes to the way we want them.
                 */
                s.sg_echo = 0;
                s.sg_eofch = 0;
                s.sg_pause = 0;
                s.sg_psch = 0;
        } else
        {
                /*
                 * Restore saved modes.
                 */
                s = save_term;
        }
        _ss_opt(tty, &s);
    }
#else
        /* MS-DOS, Windows, or OS2 */
#if OS2
        /* OS2 */
        LSIGNAL(SIGINT, SIG_IGN);
#endif
        erase_char = '\b';
#if MSDOS_COMPILER==DJGPPC
        kill_char = CONTROL('U');
        /*
         * So that when we shell out or run another program, its
         * stdin is in cooked mode.  We do not switch stdin to binary 
         * mode if fd0 is zero, since that means we were called before
         * tty was reopened in open_getchr, in which case we would be
         * changing the original stdin device outside less.
         */
        if (fd0 != 0)
                setmode(0, on ? O_BINARY : O_TEXT);
#else
        kill_char = ESC;
#endif
        werase_char = CONTROL('W');
#endif
#endif
#endif
#endif
        curr_on = on;
}

#if !MSDOS_COMPILER
/*
 * Some glue to prevent calling termcap functions if tgetent() failed.
 */
static int hardcopy;

        static char *
ltget_env(capname)
        char *capname;
{
        char name[16];
        char *s;

        s = lgetenv("LESS_TERMCAP_DEBUG");
        if (s != NULL && *s != '\0')
        {
                struct env { struct env *next; char *name; char *value; };
                static struct env *envs = NULL;
                struct env *p;
                for (p = envs;  p != NULL;  p = p->next)
                        if (strcmp(p->name, capname) == 0)
                                return p->value;
                p = (struct env *) ecalloc(1, sizeof(struct env));
                p->name = save(capname);
                p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char));
                sprintf(p->value, "<%s>", capname);
                p->next = envs;
                envs = p;
                return p->value;
        }
        strcpy(name, "LESS_TERMCAP_");
        strcat(name, capname);
        return (lgetenv(name));
}

        static int
ltgetflag(capname)
        char *capname;
{
        char *s;

        if ((s = ltget_env(capname)) != NULL)
                return (*s != '\0' && *s != '0');
        if (hardcopy)
                return (0);
        return (tgetflag(capname));
}

        static int
ltgetnum(capname)
        char *capname;
{
        char *s;

        if ((s = ltget_env(capname)) != NULL)
                return (atoi(s));
        if (hardcopy)
                return (-1);
        return (tgetnum(capname));
}

        static char *
ltgetstr(capname, pp)
        char *capname;
        char **pp;
{
        char *s;

        if ((s = ltget_env(capname)) != NULL)
                return (s);
        if (hardcopy)
                return (NULL);
        return (tgetstr(capname, pp));
}
#endif /* MSDOS_COMPILER */

/*
 * Get size of the output screen.
 */
        public void
scrsize()
{
        register char *s;
        int sys_height;
        int sys_width;
#if !MSDOS_COMPILER
        int n;
#endif

#define DEF_SC_WIDTH    80
#if MSDOS_COMPILER
#define DEF_SC_HEIGHT   25
#else
#define DEF_SC_HEIGHT   24
#endif


        sys_width = sys_height = 0;

#if MSDOS_COMPILER==MSOFTC
        {
                struct videoconfig w;
                _getvideoconfig(&w);
                sys_height = w.numtextrows;
                sys_width = w.numtextcols;
        }
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
        {
                struct text_info w;
                gettextinfo(&w);
                sys_height = w.screenheight;
                sys_width = w.screenwidth;
        }
#else
#if MSDOS_COMPILER==WIN32C
        {
                CONSOLE_SCREEN_BUFFER_INFO scr;
                GetConsoleScreenBufferInfo(con_out, &scr);
                sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1;
                sys_width = scr.srWindow.Right - scr.srWindow.Left + 1;
        }
#else
#if OS2
        {
                int s[2];
                _scrsize(s);
                sys_width = s[0];
                sys_height = s[1];
                /*
                 * When using terminal emulators for XFree86/OS2, the
                 * _scrsize function does not work well.
                 * Call the scrsize.exe program to get the window size.
                 */
                windowid = getenv("WINDOWID");
                if (windowid != NULL)
                {
                        FILE *fd = popen("scrsize", "rt");
                        if (fd != NULL)
                        {
                                int w, h;
                                fscanf(fd, "%i %i", &w, &h);
                                if (w > 0 && h > 0)
                                {
                                        sys_width = w;
                                        sys_height = h;
                                }
                                pclose(fd);
                        }
                }
        }
#else
#ifdef TIOCGWINSZ
        {
                struct winsize w;
                if (ioctl(2, TIOCGWINSZ, &w) == 0)
                {
                        if (w.ws_row > 0)
                                sys_height = w.ws_row;
                        if (w.ws_col > 0)
                                sys_width = w.ws_col;
                }
        }
#else
#ifdef WIOCGETD
        {
                struct uwdata w;
                if (ioctl(2, WIOCGETD, &w) == 0)
                {
                        if (w.uw_height > 0)
                                sys_height = w.uw_height / w.uw_vs;
                        if (w.uw_width > 0)
                                sys_width = w.uw_width / w.uw_hs;
                }
        }
#endif
#endif
#endif
#endif
#endif
#endif

        if (sys_height > 0)
                sc_height = sys_height;
        else if ((s = lgetenv("LINES")) != NULL)
                sc_height = atoi(s);
#if !MSDOS_COMPILER
        else if ((n = ltgetnum("li")) > 0)
                sc_height = n;
#endif
        if (sc_height <= 0)
                sc_height = DEF_SC_HEIGHT;

        if (sys_width > 0)
                sc_width = sys_width;
        else if ((s = lgetenv("COLUMNS")) != NULL)
                sc_width = atoi(s);
#if !MSDOS_COMPILER
        else if ((n = ltgetnum("co")) > 0)
                sc_width = n;
#endif
        if (sc_width <= 0)
                sc_width = DEF_SC_WIDTH;
}

#if MSDOS_COMPILER==MSOFTC
/*
 * Figure out how many empty loops it takes to delay a millisecond.
 */
        static void
get_clock()
{
        clock_t start;
        
        /*
         * Get synchronized at the start of a tick.
         */
        start = clock();
        while (clock() == start)
                ;
        /*
         * Now count loops till the next tick.
         */
        start = clock();
        msec_loops = 0;
        while (clock() == start)
                msec_loops++;
        /*
         * Convert from (loops per clock) to (loops per millisecond).
         */
        msec_loops *= CLOCKS_PER_SEC;
        msec_loops /= 1000;
}

/*
 * Delay for a specified number of milliseconds.
 */
        static void
dummy_func()
{
        static long delay_dummy = 0;
        delay_dummy++;
}

        static void
delay(msec)
        int msec;
{
        long i;
        
        while (msec-- > 0)
        {
                for (i = 0;  i < msec_loops;  i++)
                {
                        /*
                         * Make it look like we're doing something here,
                         * so the optimizer doesn't remove the whole loop.
                         */
                        dummy_func();
                }
        }
}
#endif

/*
 * Return the characters actually input by a "special" key.
 */
        public char *
special_key_str(key)
        int key;
{
        static char tbuf[40];
        char *s;
#if MSDOS_COMPILER || OS2
        static char k_right[]           = { '\340', PCK_RIGHT, 0 };
        static char k_left[]            = { '\340', PCK_LEFT, 0  };
        static char k_ctl_right[]       = { '\340', PCK_CTL_RIGHT, 0  };
        static char k_ctl_left[]        = { '\340', PCK_CTL_LEFT, 0  };
        static char k_insert[]          = { '\340', PCK_INSERT, 0  };
        static char k_delete[]          = { '\340', PCK_DELETE, 0  };
        static char k_ctl_delete[]      = { '\340', PCK_CTL_DELETE, 0  };
        static char k_ctl_backspace[]   = { '\177', 0 };
        static char k_home[]            = { '\340', PCK_HOME, 0 };
        static char k_end[]             = { '\340', PCK_END, 0 };
        static char k_up[]              = { '\340', PCK_UP, 0 };
        static char k_down[]            = { '\340', PCK_DOWN, 0 };
        static char k_backtab[]         = { '\340', PCK_SHIFT_TAB, 0 };
        static char k_pagedown[]        = { '\340', PCK_PAGEDOWN, 0 };
        static char k_pageup[]          = { '\340', PCK_PAGEUP, 0 };
        static char k_f1[]              = { '\340', PCK_F1, 0 };
#endif
#if !MSDOS_COMPILER
        char *sp = tbuf;
#endif

        switch (key)
        {
#if OS2
        /*
         * If windowid is not NULL, assume less is executed in 
         * the XFree86 environment.
         */
        case SK_RIGHT_ARROW:
                s = windowid ? ltgetstr("kr", &sp) : k_right;
                break;
        case SK_LEFT_ARROW:
                s = windowid ? ltgetstr("kl", &sp) : k_left;
                break;
        case SK_UP_ARROW:
                s = windowid ? ltgetstr("ku", &sp) : k_up;
                break;
        case SK_DOWN_ARROW:
                s = windowid ? ltgetstr("kd", &sp) : k_down;
                break;
        case SK_PAGE_UP:
                s = windowid ? ltgetstr("kP", &sp) : k_pageup;
                break;
        case SK_PAGE_DOWN:
                s = windowid ? ltgetstr("kN", &sp) : k_pagedown;
                break;
        case SK_HOME:
                s = windowid ? ltgetstr("kh", &sp) : k_home;
                break;
        case SK_END:
                s = windowid ? ltgetstr("@7", &sp) : k_end;
                break;
        case SK_DELETE:
                if (windowid)
                {
                        s = ltgetstr("kD", &sp);
                        if (s == NULL)
                        {
                                tbuf[0] = '\177';
                                tbuf[1] = '\0';
                                s = tbuf;
                        }
                } else
                        s = k_delete;
                break;
#endif
#if MSDOS_COMPILER
        case SK_RIGHT_ARROW:
                s = k_right;
                break;
        case SK_LEFT_ARROW:
                s = k_left;
                break;
        case SK_UP_ARROW:
                s = k_up;
                break;
        case SK_DOWN_ARROW:
                s = k_down;
                break;
        case SK_PAGE_UP:
                s = k_pageup;
                break;
        case SK_PAGE_DOWN:
                s = k_pagedown;
                break;
        case SK_HOME:
                s = k_home;
                break;
        case SK_END:
                s = k_end;
                break;
        case SK_DELETE:
                s = k_delete;
                break;
#endif
#if MSDOS_COMPILER || OS2
        case SK_INSERT:
                s = k_insert;
                break;
        case SK_CTL_LEFT_ARROW:
                s = k_ctl_left;
                break;
        case SK_CTL_RIGHT_ARROW:
                s = k_ctl_right;
                break;
        case SK_CTL_BACKSPACE:
                s = k_ctl_backspace;
                break;
        case SK_CTL_DELETE:
                s = k_ctl_delete;
                break;
        case SK_F1:
                s = k_f1;
                break;
        case SK_BACKTAB:
                s = k_backtab;
                break;
#else
        case SK_RIGHT_ARROW:
                s = ltgetstr("kr", &sp);
                break;
        case SK_LEFT_ARROW:
                s = ltgetstr("kl", &sp);
                break;
        case SK_UP_ARROW:
                s = ltgetstr("ku", &sp);
                break;
        case SK_DOWN_ARROW:
                s = ltgetstr("kd", &sp);
                break;
        case SK_PAGE_UP:
                s = ltgetstr("kP", &sp);
                break;
        case SK_PAGE_DOWN:
                s = ltgetstr("kN", &sp);
                break;
        case SK_HOME:
                s = ltgetstr("kh", &sp);
                break;
        case SK_END:
                s = ltgetstr("@7", &sp);
                break;
        case SK_DELETE:
                s = ltgetstr("kD", &sp);
                if (s == NULL)
                {
                        tbuf[0] = '\177';
                        tbuf[1] = '\0';
                        s = tbuf;
                }
                break;
#endif
        case SK_CONTROL_K:
                tbuf[0] = CONTROL('K');
                tbuf[1] = '\0';
                s = tbuf;
                break;
        default:
                return (NULL);
        }
        return (s);
}

/*
 * Get terminal capabilities via termcap.
 */
        public void
get_term()
{
#if MSDOS_COMPILER
        auto_wrap = 1;
        ignaw = 0;
        can_goto_line = 1;
        clear_bg = 1;
        /*
         * Set up default colors.
         * The xx_s_width and xx_e_width vars are already initialized to 0.
         */
#if MSDOS_COMPILER==MSOFTC
        sy_bg_color = _getbkcolor();
        sy_fg_color = _gettextcolor();
        get_clock();
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
    {
        struct text_info w;
        gettextinfo(&w);
        sy_bg_color = (w.attribute >> 4) & 0x0F;
        sy_fg_color = (w.attribute >> 0) & 0x0F;
    }
#else
#if MSDOS_COMPILER==WIN32C
    {
        DWORD nread;
        CONSOLE_SCREEN_BUFFER_INFO scr;

        con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE);
        /*
         * Always open stdin in binary. Note this *must* be done
         * before any file operations have been done on fd0.
         */
        SET_BINARY(0);
        GetConsoleScreenBufferInfo(con_out, &scr);
        ReadConsoleOutputAttribute(con_out, &curr_attr, 
                                        1, scr.dwCursorPosition, &nread);
        sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */
        sy_fg_color = curr_attr & FG_COLORS;
    }
#endif
#endif
#endif
        nm_fg_color = sy_fg_color;
        nm_bg_color = sy_bg_color;
        bo_fg_color = 11;
        bo_bg_color = 0;
        ul_fg_color = 9;
        ul_bg_color = 0;
        so_fg_color = 15;
        so_bg_color = 9;
        bl_fg_color = 15;
        bl_bg_color = 0;

        /*
         * Get size of the screen.
         */
        scrsize();
        pos_init();


#else /* !MSDOS_COMPILER */

        char *sp;
        register char *t1, *t2;
        char *term;
        char termbuf[TERMBUF_SIZE];

        static char sbuf[TERMSBUF_SIZE];

#if OS2
        /*
         * Make sure the termcap database is available.
         */
        sp = lgetenv("TERMCAP");
        if (sp == NULL || *sp == '\0')
        {
                char *termcap;
                if ((sp = homefile("termcap.dat")) != NULL)
                {
                        termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char));
                        sprintf(termcap, "TERMCAP=%s", sp);
                        free(sp);
                        putenv(termcap);
                }
        }
#endif
        /*
         * Find out what kind of terminal this is.
         */
        if ((term = lgetenv("TERM")) == NULL)
                term = DEFAULT_TERM;
        hardcopy = 0;
        if (tgetent(termbuf, term) != TGETENT_OK)
                hardcopy = 1;
        if (ltgetflag("hc"))
                hardcopy = 1;

        /*
         * Get size of the screen.
         */
        scrsize();
        pos_init();

        auto_wrap = ltgetflag("am");
        ignaw = ltgetflag("xn");
        above_mem = ltgetflag("da");
        below_mem = ltgetflag("db");
        clear_bg = ltgetflag("ut");

        /*
         * Assumes termcap variable "sg" is the printing width of:
         * the standout sequence, the end standout sequence,
         * the underline sequence, the end underline sequence,
         * the boldface sequence, and the end boldface sequence.
         */
        if ((so_s_width = ltgetnum("sg")) < 0)
                so_s_width = 0;
        so_e_width = so_s_width;

        bo_s_width = bo_e_width = so_s_width;
        ul_s_width = ul_e_width = so_s_width;
        bl_s_width = bl_e_width = so_s_width;

#if HILITE_SEARCH
        if (so_s_width > 0 || so_e_width > 0)
                /*
                 * Disable highlighting by default on magic cookie terminals.
                 * Turning on highlighting might change the displayed width
                 * of a line, causing the display to get messed up.
                 * The user can turn it back on with -g, 
                 * but she won't like the results.
                 */
                hilite_search = 0;
#endif

        /*
         * Get various string-valued capabilities.
         */
        sp = sbuf;

#if HAVE_OSPEED
        sc_pad = ltgetstr("pc", &sp);
        if (sc_pad != NULL)
                PC = *sc_pad;
#endif

        sc_s_keypad = ltgetstr("ks", &sp);
        if (sc_s_keypad == NULL)
                sc_s_keypad = "";
        sc_e_keypad = ltgetstr("ke", &sp);
        if (sc_e_keypad == NULL)
                sc_e_keypad = "";
                
        sc_init = ltgetstr("ti", &sp);
        if (sc_init == NULL)
                sc_init = "";

        sc_deinit= ltgetstr("te", &sp);
        if (sc_deinit == NULL)
                sc_deinit = "";

        sc_eol_clear = ltgetstr("ce", &sp);
        if (sc_eol_clear == NULL || *sc_eol_clear == '\0')
        {
                missing_cap = 1;
                sc_eol_clear = "";
        }

        sc_eos_clear = ltgetstr("cd", &sp);
        if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0'))
        {
                missing_cap = 1;
                sc_eos_clear = "";
        }

        sc_clear = ltgetstr("cl", &sp);
        if (sc_clear == NULL || *sc_clear == '\0')
        {
                missing_cap = 1;
                sc_clear = "\n\n";
        }

        sc_move = ltgetstr("cm", &sp);
        if (sc_move == NULL || *sc_move == '\0')
        {
                /*
                 * This is not an error here, because we don't 
                 * always need sc_move.
                 * We need it only if we don't have home or lower-left.
                 */
                sc_move = "";
                can_goto_line = 0;
        } else
                can_goto_line = 1;

        tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp);
        tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp);
        tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp);
        tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp);

        sc_visual_bell = ltgetstr("vb", &sp);
        if (sc_visual_bell == NULL)
                sc_visual_bell = "";

        if (ltgetflag("bs"))
                sc_backspace = "\b";
        else
        {
                sc_backspace = ltgetstr("bc", &sp);
                if (sc_backspace == NULL || *sc_backspace == '\0')
                        sc_backspace = "\b";
        }

        /*
         * Choose between using "ho" and "cm" ("home" and "cursor move")
         * to move the cursor to the upper left corner of the screen.
         */
        t1 = ltgetstr("ho", &sp);
        if (t1 == NULL)
                t1 = "";
        if (*sc_move == '\0')
                t2 = "";
        else
        {
                strcpy(sp, tgoto(sc_move, 0, 0));
                t2 = sp;
                sp += strlen(sp) + 1;
        }
        sc_home = cheaper(t1, t2, "|\b^");

        /*
         * Choose between using "ll" and "cm"  ("lower left" and "cursor move")
         * to move the cursor to the lower left corner of the screen.
         */
        t1 = ltgetstr("ll", &sp);
        if (t1 == NULL)
                t1 = "";
        if (*sc_move == '\0')
                t2 = "";
        else
        {
                strcpy(sp, tgoto(sc_move, 0, sc_height-1));
                t2 = sp;
                sp += strlen(sp) + 1;
        }
        sc_lower_left = cheaper(t1, t2, "\r");

        /*
         * Get carriage return string.
         */
        sc_return = ltgetstr("cr", &sp);
        if (sc_return == NULL)
                sc_return = "\r";

        /*
         * Choose between using "al" or "sr" ("add line" or "scroll reverse")
         * to add a line at the top of the screen.
         */
        t1 = ltgetstr("al", &sp);
        if (t1 == NULL)
                t1 = "";
        t2 = ltgetstr("sr", &sp);
        if (t2 == NULL)
                t2 = "";
#if OS2
        if (*t1 == '\0' && *t2 == '\0')
                sc_addline = "";
        else
#endif
        if (above_mem)
                sc_addline = t1;
        else
                sc_addline = cheaper(t1, t2, "");
        if (*sc_addline == '\0')
        {
                /*
                 * Force repaint on any backward movement.
                 */
                no_back_scroll = 1;
        }
#endif /* MSDOS_COMPILER */
}

#if !MSDOS_COMPILER
/*
 * Return the cost of displaying a termcap string.
 * We use the trick of calling tputs, but as a char printing function
 * we give it inc_costcount, which just increments "costcount".
 * This tells us how many chars would be printed by using this string.
 * {{ Couldn't we just use strlen? }}
 */
static int costcount;

/*ARGSUSED*/
        static int
inc_costcount(c)
        int c;
{
        costcount++;
        return (c);
}

        static int
cost(t)
        char *t;
{
        costcount = 0;
        tputs(t, sc_height, inc_costcount);
        return (costcount);
}

/*
 * Return the "best" of the two given termcap strings.
 * The best, if both exist, is the one with the lower 
 * cost (see cost() function).
 */
        static char *
cheaper(t1, t2, def)
        char *t1, *t2;
        char *def;
{
        if (*t1 == '\0' && *t2 == '\0')
        {
                missing_cap = 1;
                return (def);
        }
        if (*t1 == '\0')
                return (t2);
        if (*t2 == '\0')
                return (t1);
        if (cost(t1) < cost(t2))
                return (t1);
        return (t2);
}

        static void
tmodes(incap, outcap, instr, outstr, def_instr, def_outstr, spp)
        char *incap;
        char *outcap;
        char **instr;
        char **outstr;
        char *def_instr;
        char *def_outstr;
        char **spp;
{
        *instr = ltgetstr(incap, spp);
        if (*instr == NULL)
        {
                /* Use defaults. */
                *instr = def_instr;
                *outstr = def_outstr;
                return;
        }

        *outstr = ltgetstr(outcap, spp);
        if (*outstr == NULL)
                /* No specific out capability; use "me". */
                *outstr = ltgetstr("me", spp);
        if (*outstr == NULL)
                /* Don't even have "me"; use a null string. */
                *outstr = "";
}

#endif /* MSDOS_COMPILER */


/*
 * Below are the functions which perform all the 
 * terminal-specific screen manipulation.
 */


#if MSDOS_COMPILER

#if MSDOS_COMPILER==WIN32C
        static void
_settextposition(int row, int col)
{
        COORD cpos;
        CONSOLE_SCREEN_BUFFER_INFO csbi;

        GetConsoleScreenBufferInfo(con_out, &csbi);
        cpos.X = csbi.srWindow.Left + (col - 1);
        cpos.Y = csbi.srWindow.Top + (row - 1);
        SetConsoleCursorPosition(con_out, cpos);
}
#endif

/*
 * Initialize the screen to the correct color at startup.
 */
        static void
initcolor()
{
        SETCOLORS(nm_fg_color, nm_bg_color);
#if 0
        /*
         * This clears the screen at startup.  This is different from
         * the behavior of other versions of less.  Disable it for now.
         */
        char *blanks;
        int row;
        int col;
        
        /*
         * Create a complete, blank screen using "normal" colors.
         */
        SETCOLORS(nm_fg_color, nm_bg_color);
        blanks = (char *) ecalloc(width+1, sizeof(char));
        for (col = 0;  col < sc_width;  col++)
                blanks[col] = ' ';
        blanks[sc_width] = '\0';
        for (row = 0;  row < sc_height;  row++)
                _outtext(blanks);
        free(blanks);
#endif
}
#endif

#if MSDOS_COMPILER==WIN32C

/*
 * Termcap-like init with a private win32 console.
 */
        static void
win32_init_term()
{
        CONSOLE_SCREEN_BUFFER_INFO scr;
        COORD size;

        if (con_out_save == INVALID_HANDLE_VALUE)
                return;

        GetConsoleScreenBufferInfo(con_out_save, &scr);

        if (con_out_ours == INVALID_HANDLE_VALUE)
        {
                /*
                 * Create our own screen buffer, so that we
                 * may restore the original when done.
                 */
                con_out_ours = CreateConsoleScreenBuffer(
                        GENERIC_WRITE | GENERIC_READ,
                        FILE_SHARE_WRITE | FILE_SHARE_READ,
                        (LPSECURITY_ATTRIBUTES) NULL,
                        CONSOLE_TEXTMODE_BUFFER,
                        (LPVOID) NULL);
        }

        size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
        size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
        SetConsoleScreenBufferSize(con_out_ours, size);
        SetConsoleActiveScreenBuffer(con_out_ours);
        con_out = con_out_ours;
}

/*
 * Restore the startup console.
 */
static void
win32_deinit_term()
{
        if (con_out_save == INVALID_HANDLE_VALUE)
                return;
        if (quitting)
                (void) CloseHandle(con_out_ours);
        SetConsoleActiveScreenBuffer(con_out_save);
        con_out = con_out_save;
}

#endif

/*
 * Initialize terminal
 */
        public void
init()
{
#if !MSDOS_COMPILER
        if (!no_init)
                tputs(sc_init, sc_height, putchr);
        if (!no_keypad)
                tputs(sc_s_keypad, sc_height, putchr);
        if (top_scroll) 
        {
                int i;

                /*
                 * This is nice to terminals with no alternate screen,
                 * but with saved scrolled-off-the-top lines.  This way,
                 * no previous line is lost, but we start with a whole
                 * screen to ourself.
                 */
                for (i = 1; i < sc_height; i++)
                        putchr('\n');
        } else
                line_left();
#else
#if MSDOS_COMPILER==WIN32C
        if (!no_init)
                win32_init_term();
#endif
        initcolor();
        flush();
#endif
        init_done = 1;
}

/*
 * Deinitialize terminal
 */
        public void
deinit()
{
        if (!init_done)
                return;
#if !MSDOS_COMPILER
        if (!no_keypad)
                tputs(sc_e_keypad, sc_height, putchr);
        if (!no_init)
                tputs(sc_deinit, sc_height, putchr);
#else
        /* Restore system colors. */
        SETCOLORS(sy_fg_color, sy_bg_color);
#if MSDOS_COMPILER==WIN32C
        if (!no_init)
                win32_deinit_term();
#else
        /* Need clreol to make SETCOLORS take effect. */
        clreol();
#endif
#endif
        init_done = 0;
}

/*
 * Home cursor (move to upper left corner of screen).
 */
        public void
home()
{
#if !MSDOS_COMPILER
        tputs(sc_home, 1, putchr);
#else
        flush();
        _settextposition(1,1);
#endif
}

/*
 * Add a blank line (called with cursor at home).
 * Should scroll the display down.
 */
        public void
add_line()
{
#if !MSDOS_COMPILER
        tputs(sc_addline, sc_height, putchr);
#else
        flush();
#if MSDOS_COMPILER==MSOFTC
        _scrolltextwindow(_GSCROLLDOWN);
        _settextposition(1,1);
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
        movetext(1,1, sc_width,sc_height-1, 1,2);
        gotoxy(1,1);
        clreol();
#else
#if MSDOS_COMPILER==WIN32C
    {
        CHAR_INFO fillchar;
        SMALL_RECT rcSrc, rcClip;
        COORD new_org;
        CONSOLE_SCREEN_BUFFER_INFO csbi;

        GetConsoleScreenBufferInfo(con_out,&csbi);

        /* The clip rectangle is the entire visible screen. */
        rcClip.Left = csbi.srWindow.Left;
        rcClip.Top = csbi.srWindow.Top;
        rcClip.Right = csbi.srWindow.Right;
        rcClip.Bottom = csbi.srWindow.Bottom;

        /* The source rectangle is the visible screen minus the last line. */
        rcSrc = rcClip;
        rcSrc.Bottom--;

        /* Move the top left corner of the source window down one row. */
        new_org.X = rcSrc.Left;
        new_org.Y = rcSrc.Top + 1;

        /* Fill the right character and attributes. */
        fillchar.Char.AsciiChar = ' ';
        curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
        fillchar.Attributes = curr_attr;
        ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);
        _settextposition(1,1);
    }
#endif
#endif
#endif
#endif
}

#if 0
/*
 * Remove the n topmost lines and scroll everything below it in the 
 * window upward.  This is needed to stop leaking the topmost line 
 * into the scrollback buffer when we go down-one-line (in WIN32).
 */
        public void
remove_top(n)
        int n;
{
#if MSDOS_COMPILER==WIN32C
        SMALL_RECT rcSrc, rcClip;
        CHAR_INFO fillchar;
        COORD new_org;
        CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */

        if (n >= sc_height - 1)
        {
                clear();
                home();
                return;
        }

        flush();

        GetConsoleScreenBufferInfo(con_out, &csbi);

        /* Get the extent of all-visible-rows-but-the-last. */
        rcSrc.Left    = csbi.srWindow.Left;
        rcSrc.Top     = csbi.srWindow.Top + n;
        rcSrc.Right   = csbi.srWindow.Right;
        rcSrc.Bottom  = csbi.srWindow.Bottom;

        /* Get the clip rectangle. */
        rcClip.Left   = rcSrc.Left;
        rcClip.Top    = csbi.srWindow.Top;
        rcClip.Right  = rcSrc.Right;
        rcClip.Bottom = rcSrc.Bottom ;

        /* Move the source window up n rows. */
        new_org.X = rcSrc.Left;
        new_org.Y = rcSrc.Top - n;

        /* Fill the right character and attributes. */
        fillchar.Char.AsciiChar = ' ';
        curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
        fillchar.Attributes = curr_attr;

        ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);

        /* Position cursor on first blank line. */
        goto_line(sc_height - n - 1);
#endif
}
#endif

#if MSDOS_COMPILER==WIN32C
/*
 * Clear the screen.
 */
        static void
win32_clear()
{
        /*
         * This will clear only the currently visible rows of the NT
         * console buffer, which means none of the precious scrollback
         * rows are touched making for faster scrolling.  Note that, if
         * the window has fewer columns than the console buffer (i.e.
         * there is a horizontal scrollbar as well), the entire width
         * of the visible rows will be cleared.
         */
        COORD topleft;
        DWORD nchars;
        DWORD winsz;
        CONSOLE_SCREEN_BUFFER_INFO csbi;

        /* get the number of cells in the current buffer */
        GetConsoleScreenBufferInfo(con_out, &csbi);
        winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1);
        topleft.X = 0;
        topleft.Y = csbi.srWindow.Top;

        curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
        FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars);
        FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars);
}

/*
 * Remove the n topmost lines and scroll everything below it in the 
 * window upward.
 */
        public void
win32_scroll_up(n)
        int n;
{
        SMALL_RECT rcSrc, rcClip;
        CHAR_INFO fillchar;
        COORD topleft;
        COORD new_org;
        DWORD nchars;
        DWORD size;
        CONSOLE_SCREEN_BUFFER_INFO csbi;

        if (n <= 0)
                return;

        if (n >= sc_height - 1)
        {
                win32_clear();
                _settextposition(1,1);
                return;
        }

        /* Get the extent of what will remain visible after scrolling. */
        GetConsoleScreenBufferInfo(con_out, &csbi);
        rcSrc.Left    = csbi.srWindow.Left;
        rcSrc.Top     = csbi.srWindow.Top + n;
        rcSrc.Right   = csbi.srWindow.Right;
        rcSrc.Bottom  = csbi.srWindow.Bottom;

        /* Get the clip rectangle. */
        rcClip.Left   = rcSrc.Left;
        rcClip.Top    = csbi.srWindow.Top;
        rcClip.Right  = rcSrc.Right;
        rcClip.Bottom = rcSrc.Bottom ;

        /* Move the source text to the top of the screen. */
        new_org.X = rcSrc.Left;
        new_org.Y = rcClip.Top;

        /* Fill the right character and attributes. */
        fillchar.Char.AsciiChar = ' ';
        fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color);

        /* Scroll the window. */
        SetConsoleTextAttribute(con_out, fillchar.Attributes);
        ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar);

        /* Clear remaining lines at bottom. */
        topleft.X = csbi.dwCursorPosition.X;
        topleft.Y = rcSrc.Bottom - n;
        size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X);
        FillConsoleOutputCharacter(con_out, ' ', size, topleft,
                &nchars);
        FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft,
                &nchars);
        SetConsoleTextAttribute(con_out, curr_attr);

        /* Move cursor n lines up from where it was. */
        csbi.dwCursorPosition.Y -= n;
        SetConsoleCursorPosition(con_out, csbi.dwCursorPosition);
}
#endif

/*
 * Move cursor to lower left corner of screen.
 */
        public void
lower_left()
{
#if !MSDOS_COMPILER
        tputs(sc_lower_left, 1, putchr);
#else
        flush();
        _settextposition(sc_height, 1);
#endif
}

/*
 * Move cursor to left position of current line.
 */
        public void
line_left()
{
#if !MSDOS_COMPILER
        tputs(sc_return, 1, putchr);
#else
        int row;
        flush();
#if MSDOS_COMPILER==WIN32C
        {
                CONSOLE_SCREEN_BUFFER_INFO scr;
                GetConsoleScreenBufferInfo(con_out, &scr);
                row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
        }
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
                row = wherey();
#else
        {
                struct rccoord tpos = _gettextposition();
                row = tpos.row;
        }
#endif
#endif
        _settextposition(row, 1);
#endif
}

/*
 * Check if the console size has changed and reset internals 
 * (in lieu of SIGWINCH for WIN32).
 */
        public void
check_winch()
{
#if MSDOS_COMPILER==WIN32C
        CONSOLE_SCREEN_BUFFER_INFO scr;
        COORD size;

        if (con_out == INVALID_HANDLE_VALUE)
                return;
 
        flush();
        GetConsoleScreenBufferInfo(con_out, &scr);
        size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1;
        size.X = scr.srWindow.Right - scr.srWindow.Left + 1;
        if (size.Y != sc_height || size.X != sc_width)
        {
                sc_height = size.Y;
                sc_width = size.X;
                if (!no_init && con_out_ours == con_out)
                        SetConsoleScreenBufferSize(con_out, size);
                pos_init();
                wscroll = (sc_height + 1) / 2;
                screen_trashed = 1;
        }
#endif
}

/*
 * Goto a specific line on the screen.
 */
        public void
goto_line(slinenum)
        int slinenum;
{
#if !MSDOS_COMPILER
        tputs(tgoto(sc_move, 0, slinenum), 1, putchr);
#else
        flush();
        _settextposition(slinenum+1, 1);
#endif
}

#if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC
/*
 * Create an alternate screen which is all white.
 * This screen is used to create a "flash" effect, by displaying it
 * briefly and then switching back to the normal screen.
 * {{ Yuck!  There must be a better way to get a visual bell. }}
 */
        static void
create_flash()
{
#if MSDOS_COMPILER==MSOFTC
        struct videoconfig w;
        char *blanks;
        int row, col;
        
        _getvideoconfig(&w);
        videopages = w.numvideopages;
        if (videopages < 2)
        {
                at_enter(AT_STANDOUT);
                at_exit();
        } else
        {
                _setactivepage(1);
                at_enter(AT_STANDOUT);
                blanks = (char *) ecalloc(w.numtextcols, sizeof(char));
                for (col = 0;  col < w.numtextcols;  col++)
                        blanks[col] = ' ';
                for (row = w.numtextrows;  row > 0;  row--)
                        _outmem(blanks, w.numtextcols);
                _setactivepage(0);
                _setvisualpage(0);
                free(blanks);
                at_exit();
        }
#else
#if MSDOS_COMPILER==BORLANDC
        register int n;

        whitescreen = (unsigned short *) 
                malloc(sc_width * sc_height * sizeof(short));
        if (whitescreen == NULL)
                return;
        for (n = 0;  n < sc_width * sc_height;  n++)
                whitescreen[n] = 0x7020;
#else
#if MSDOS_COMPILER==WIN32C
        register int n;

        whitescreen = (WORD *)
                malloc(sc_height * sc_width * sizeof(WORD));
        if (whitescreen == NULL)
                return;
        /* Invert the standard colors. */
        for (n = 0;  n < sc_width * sc_height;  n++)
                whitescreen[n] = (WORD)((nm_fg_color << 4) | nm_bg_color);
#endif
#endif
#endif
        flash_created = 1;
}
#endif /* MSDOS_COMPILER */

/*
 * Output the "visual bell", if there is one.
 */
        public void
vbell()
{
#if !MSDOS_COMPILER
        if (*sc_visual_bell == '\0')
                return;
        tputs(sc_visual_bell, sc_height, putchr);
#else
#if MSDOS_COMPILER==DJGPPC
        ScreenVisualBell();
#else
#if MSDOS_COMPILER==MSOFTC
        /*
         * Create a flash screen on the second video page.
         * Switch to that page, then switch back.
         */
        if (!flash_created)
                create_flash();
        if (videopages < 2)
                return;
        _setvisualpage(1);
        delay(100);
        _setvisualpage(0);
#else
#if MSDOS_COMPILER==BORLANDC
        unsigned short *currscreen;

        /*
         * Get a copy of the current screen.
         * Display the flash screen.
         * Then restore the old screen.
         */
        if (!flash_created)
                create_flash();
        if (whitescreen == NULL)
                return;
        currscreen = (unsigned short *) 
                malloc(sc_width * sc_height * sizeof(short));
        if (currscreen == NULL) return;
        gettext(1, 1, sc_width, sc_height, currscreen);
        puttext(1, 1, sc_width, sc_height, whitescreen);
        delay(100);
        puttext(1, 1, sc_width, sc_height, currscreen);
        free(currscreen);
#else
#if MSDOS_COMPILER==WIN32C
        /* paint screen with an inverse color */
        clear();

        /* leave it displayed for 100 msec. */
        Sleep(100);

        /* restore with a redraw */
        repaint();
#endif
#endif
#endif
#endif
#endif
}

/*
 * Make a noise.
 */
        static void
beep()
{
#if !MSDOS_COMPILER
        putchr(CONTROL('G'));
#else
#if MSDOS_COMPILER==WIN32C
        MessageBeep(0);
#else
        write(1, "\7", 1);
#endif
#endif
}

/*
 * Ring the terminal bell.
 */
        public void
bell()
{
        if (quiet == VERY_QUIET)
                vbell();
        else
                beep();
}

/*
 * Clear the screen.
 */
        public void
clear()
{
#if !MSDOS_COMPILER
        tputs(sc_clear, sc_height, putchr);
#else
        flush();
#if MSDOS_COMPILER==WIN32C
        win32_clear();
#else
        _clearscreen(_GCLEARSCREEN);
#endif
#endif
}

/*
 * Clear from the cursor to the end of the cursor's line.
 * {{ This must not move the cursor. }}
 */
        public void
clear_eol()
{
#if !MSDOS_COMPILER
        tputs(sc_eol_clear, 1, putchr);
#else
#if MSDOS_COMPILER==MSOFTC
        short top, left;
        short bot, right;
        struct rccoord tpos;
        
        flush();
        /*
         * Save current state.
         */
        tpos = _gettextposition();
        _gettextwindow(&top, &left, &bot, &right);
        /*
         * Set a temporary window to the current line,
         * from the cursor's position to the right edge of the screen.
         * Then clear that window.
         */
        _settextwindow(tpos.row, tpos.col, tpos.row, sc_width);
        _clearscreen(_GWINDOW);
        /*
         * Restore state.
         */
        _settextwindow(top, left, bot, right);
        _settextposition(tpos.row, tpos.col);
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
        flush();
        clreol();
#else
#if MSDOS_COMPILER==WIN32C
        DWORD           nchars;
        COORD           cpos;
        CONSOLE_SCREEN_BUFFER_INFO scr;

        flush();
        memset(&scr, 0, sizeof(scr));
        GetConsoleScreenBufferInfo(con_out, &scr);
        cpos.X = scr.dwCursorPosition.X;
        cpos.Y = scr.dwCursorPosition.Y;
        curr_attr = MAKEATTR(nm_fg_color, nm_bg_color);
        FillConsoleOutputAttribute(con_out, curr_attr,
                scr.dwSize.X - cpos.X, cpos, &nchars);
        FillConsoleOutputCharacter(con_out, ' ',
                scr.dwSize.X - cpos.X, cpos, &nchars);
#endif
#endif
#endif
#endif
}

/*
 * Clear the current line.
 * Clear the screen if there's off-screen memory below the display.
 */
        static void
clear_eol_bot()
{
#if MSDOS_COMPILER
        clear_eol();
#else
        if (below_mem)
                tputs(sc_eos_clear, 1, putchr);
        else
                tputs(sc_eol_clear, 1, putchr);
#endif
}

/*
 * Clear the bottom line of the display.
 * Leave the cursor at the beginning of the bottom line.
 */
        public void
clear_bot()
{
        /*
         * If we're in a non-normal attribute mode, temporarily exit
         * the mode while we do the clear.  Some terminals fill the
         * cleared area with the current attribute.
         */
        if (oldbot)
                lower_left();
        else
                line_left();

        if (attrmode == AT_NORMAL)
                clear_eol_bot();
        else
        {
                int saved_attrmode = attrmode;

                at_exit();
                clear_eol_bot();
                at_enter(saved_attrmode);
        }
}

        public void
at_enter(attr)
        int attr;
{
        attr = apply_at_specials(attr);

#if !MSDOS_COMPILER
        /* The one with the most priority is last.  */
        if (attr & AT_UNDERLINE)
                tputs(sc_u_in, 1, putchr);
        if (attr & AT_BOLD)
                tputs(sc_b_in, 1, putchr);
        if (attr & AT_BLINK)
                tputs(sc_bl_in, 1, putchr);
        if (attr & AT_STANDOUT)
                tputs(sc_s_in, 1, putchr);
#else
        flush();
        /* The one with the most priority is first.  */
        if (attr & AT_STANDOUT)
        {
                SETCOLORS(so_fg_color, so_bg_color);
        } else if (attr & AT_BLINK)
        {
                SETCOLORS(bl_fg_color, bl_bg_color);
        }
        else if (attr & AT_BOLD)
        {
                SETCOLORS(bo_fg_color, bo_bg_color);
        }
        else if (attr & AT_UNDERLINE)
        {
                SETCOLORS(ul_fg_color, ul_bg_color);
        }
#endif

        attrmode = attr;
}

        public void
at_exit()
{
#if !MSDOS_COMPILER
        /* Undo things in the reverse order we did them.  */
        if (attrmode & AT_STANDOUT)
                tputs(sc_s_out, 1, putchr);
        if (attrmode & AT_BLINK)
                tputs(sc_bl_out, 1, putchr);
        if (attrmode & AT_BOLD)
                tputs(sc_b_out, 1, putchr);
        if (attrmode & AT_UNDERLINE)
                tputs(sc_u_out, 1, putchr);
#else
        flush();
        SETCOLORS(nm_fg_color, nm_bg_color);
#endif

        attrmode = AT_NORMAL;
}

        public void
at_switch(attr)
        int attr;
{
        int new_attrmode = apply_at_specials(attr);
        int ignore_modes = AT_ANSI;

        if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes))
        {
                at_exit();
                at_enter(attr);
        }
}

        public int
is_at_equiv(attr1, attr2)
        int attr1;
        int attr2;
{
        attr1 = apply_at_specials(attr1);
        attr2 = apply_at_specials(attr2);

        return (attr1 == attr2);
}

        public int
apply_at_specials(attr)
        int attr;
{
        if (attr & AT_BINARY)
                attr |= binattr;
        if (attr & AT_HILITE)
                attr |= AT_STANDOUT;
        attr &= ~(AT_BINARY|AT_HILITE);

        return attr;
}

#if 0 /* No longer used */
/*
 * Erase the character to the left of the cursor 
 * and move the cursor left.
 */
        public void
backspace()
{
#if !MSDOS_COMPILER
        /* 
         * Erase the previous character by overstriking with a space.
         */
        tputs(sc_backspace, 1, putchr);
        putchr(' ');
        tputs(sc_backspace, 1, putchr);
#else
#if MSDOS_COMPILER==MSOFTC
        struct rccoord tpos;
        
        flush();
        tpos = _gettextposition();
        if (tpos.col <= 1)
                return;
        _settextposition(tpos.row, tpos.col-1);
        _outtext(" ");
        _settextposition(tpos.row, tpos.col-1);
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
        cputs("\b");
#else
#if MSDOS_COMPILER==WIN32C
        COORD cpos;
        DWORD cChars;
        CONSOLE_SCREEN_BUFFER_INFO scr;

        flush();
        GetConsoleScreenBufferInfo(con_out, &scr);
        cpos = scr.dwCursorPosition;
        if (cpos.X <= 0)
                return;
        cpos.X--;
        SetConsoleCursorPosition(con_out, cpos);
        FillConsoleOutputCharacter(con_out, (TCHAR)' ', 1, cpos, &cChars);
        SetConsoleCursorPosition(con_out, cpos);
#endif
#endif
#endif
#endif
}
#endif /* 0 */

/*
 * Output a plain backspace, without erasing the previous char.
 */
        public void
putbs()
{
#if !MSDOS_COMPILER
        tputs(sc_backspace, 1, putchr);
#else
        int row, col;

        flush();
        {
#if MSDOS_COMPILER==MSOFTC
                struct rccoord tpos;
                tpos = _gettextposition();
                row = tpos.row;
                col = tpos.col;
#else
#if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC
                row = wherey();
                col = wherex();
#else
#if MSDOS_COMPILER==WIN32C
                CONSOLE_SCREEN_BUFFER_INFO scr;
                GetConsoleScreenBufferInfo(con_out, &scr);
                row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1;
                col = scr.dwCursorPosition.X - scr.srWindow.Left + 1;
#endif
#endif
#endif
        }
        if (col <= 1)
                return;
        _settextposition(row, col-1);
#endif /* MSDOS_COMPILER */
}

#if MSDOS_COMPILER==WIN32C
/*
 * Determine whether an input character is waiting to be read.
 */
        static int
win32_kbhit(tty)
        HANDLE tty;
{
        INPUT_RECORD ip;
        DWORD read;

        if (keyCount > 0)
                return (TRUE);

        currentKey.ascii = 0;
        currentKey.scan = 0;

        /*
         * Wait for a real key-down event, but
         * ignore SHIFT and CONTROL key events.
         */
        do
        {
                PeekConsoleInput(tty, &ip, 1, &read);
                if (read == 0)
                        return (FALSE);
                ReadConsoleInput(tty, &ip, 1, &read);
        } while (ip.EventType != KEY_EVENT ||
                ip.Event.KeyEvent.bKeyDown != TRUE ||
                ip.Event.KeyEvent.wVirtualScanCode == 0 ||
                ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
                ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL ||
                ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU);
                
        currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar;
        currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode;
        keyCount = ip.Event.KeyEvent.wRepeatCount;

        if (ip.Event.KeyEvent.dwControlKeyState & 
                (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
        {
                switch (currentKey.scan)
                {
                case PCK_ALT_E:     /* letter 'E' */
                        currentKey.ascii = 0;
                        break;
                }
        } else if (ip.Event.KeyEvent.dwControlKeyState & 
                (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED))
        {
                switch (currentKey.scan)
                {
                case PCK_RIGHT: /* right arrow */
                        currentKey.scan = PCK_CTL_RIGHT;
                        break;
                case PCK_LEFT: /* left arrow */
                        currentKey.scan = PCK_CTL_LEFT;
                        break;
                case PCK_DELETE: /* delete */
                        currentKey.scan = PCK_CTL_DELETE;
                        break;
                }
        }
        return (TRUE);
}

/*
 * Read a character from the keyboard.
 */
        public char
WIN32getch(tty)
        int tty;
{
        int ascii;

        if (pending_scancode)
        {
                pending_scancode = 0;
                return ((char)(currentKey.scan & 0x00FF));
        }

        while (win32_kbhit((HANDLE)tty) == FALSE)
        {
                Sleep(20);
                if (ABORT_SIGS())
                        return ('\003');
                continue;
        }
        keyCount --;
        ascii = currentKey.ascii;
        /*
         * On PC's, the extended keys return a 2 byte sequence beginning 
         * with '00', so if the ascii code is 00, the next byte will be 
         * the lsb of the scan code.
         */
        pending_scancode = (ascii == 0x00);
        return ((char)ascii);
}
#endif

#if MSDOS_COMPILER
/*
 */
        public void
WIN32setcolors(fg, bg)
        int fg;
        int bg;
{
        SETCOLORS(fg, bg);
}

/*
 */
        public void
WIN32textout(text, len)
        char *text;
        int len;
{
#if MSDOS_COMPILER==WIN32C
        DWORD written;
        WriteConsole(con_out, text, len, &written, NULL);
#else
        char c = text[len];
        text[len] = '\0';
        cputs(text);
        text[len] = c;
#endif
}
#endif