/* vim:set cin ft=c sw=4 sts=4 ts=8 et ai cino=Ls\:0t0(0 : -*- mode:c;fill-column:80;tab-width:8;c-basic-offset:4;indent-tabs-mode:nil;c-file-style:"k&r" -*-*/
/* NetHack 5.0 cursmisc.c */
/* Copyright (c) Karl Garrison, 2010. */
/* NetHack may be freely redistributed.  See license for details. */

#include "curses.h"
#include "hack.h"
#include "wincurs.h"
#include "cursmisc.h"
#include "func_tab.h"
#include "dlb.h"

/* Misc. curses interface functions */

/* Private declarations */

static int curs_x = -1;
static int curs_y = -1;

#if defined(PDCURSES) && defined(PDC_KEY_MODIFIER_ALT)
static unsigned long last_getch_modifiers = 0L;
static boolean modifiers_available = TRUE;
#else
static boolean modifiers_available = FALSE;
#endif

static int modified(int ch);
static void update_modifiers(void);
static int parse_escape_sequence(int, boolean *);

#define SS3 M(C('O')) /* 8-bit escape sequence initiator for VT number pad */

int
curses_getch(void)
{
    int ch;

    if (iflags.debug_fuzzer)
        ch = randomkey();
    else
        ch = getch();
    return ch;
}

/* Read a character of input from the user */

int
curses_read_char(void)
{
    int ch;

    /* cancel message suppression; all messages have had a chance to be read */
    curses_got_input();

    ch = curses_getch();
    ch = curses_convert_keys(ch);

    if (ch == 0) {
        ch = '\033'; /* map NUL to ESC since nethack doesn't expect NUL */
    }

    if (counting && !isdigit(ch)) { /* dismiss count window if necessary */
        curses_count_window(NULL);
        curses_refresh_nethack_windows();
    }

    return ch;
}

/* Turn on or off the specified color and / or attribute */

void
curses_toggle_color_attr(WINDOW *win, int color, int attr, int onoff)
{
    if (color == NO_COLOR)
        color = NONE;

    int curses_color;
    boolean use_bold = FALSE;

    /* if color is disabled, just show attribute */
    if ((win == mapwin) ? !iflags.wc_color
                        /* statuswin is for #if STATUS_HILITES
                           but doesn't need to be conditional */
                        : !(iflags.wc2_guicolor || win == statuswin)) {
        if (attr != NONE) {
            if (onoff == ON)
                wattron(win, attr);
            else
                wattroff(win, attr);
        }
        return;
    }

    if (color == CLR_BLACK) {           /* make black fg visible */
# ifdef USE_DARKGRAY
        if (iflags.wc2_darkgray) {
            if (COLORS > 16) {
                /* colorpair for black is already darkgray */
            } else {            /* Use bold for a bright black */
                wattron(win, A_BOLD);
            }
        } else
# endif/* USE_DARKGRAY */
            color = CLR_BLUE;
    }

    if (COLORS < 16) {
        /* convert NetHack's 16 colors to 8 colors + BOLD */
        int fg = color % 16;
        int bg = color / 16;

        if (fg > 7)
            use_bold = TRUE;

        curses_color = (8 * (bg % 8)) + (fg % 8) + 1;
    } else {
        curses_color = color + 1;
    }

    if (onoff == ON) {          /* Turn on color/attributes */
        if (color != NONE) {
            if (use_bold) {
                wattron(win, A_BOLD);
            }
            wattron(win, COLOR_PAIR(curses_color));
        }

        if (attr != NONE) {
            wattron(win, attr);
        }
    } else {                    /* Turn off color/attributes */

        if (color != NONE) {
            if (use_bold) {
                wattroff(win, A_BOLD);
            }
# ifdef USE_DARKGRAY
            if ((color == 0) && (COLORS <= 16)) {
                wattroff(win, A_BOLD);
            }
# else
            if (iflags.use_inverse) {
                wattroff(win, A_REVERSE);
            }
# endif/* DARKGRAY */
            wattroff(win, COLOR_PAIR(curses_color));
        }

        if (attr != NONE) {
            wattroff(win, attr);
        }
    }
}

/* call curses_toggle_color_attr() with 'menucolors' instead of 'guicolor'
   as the control flag */

void
curses_menu_color_attr(WINDOW *win, int color, int attr, int onoff)
{
    boolean save_guicolor = iflags.wc2_guicolor;

    /* curses_toggle_color_attr() uses 'guicolor' to decide whether to
       honor specified color, but menu windows have their own
       more-specific control, 'menucolors', so override with that here */
/*    iflags.wc2_guicolor = iflags.use_menu_color; */
    iflags.wc2_guicolor = (color != NONE);
    curses_toggle_color_attr(win, color, attr, onoff);
    iflags.wc2_guicolor = save_guicolor;
}


/* clean up and quit - taken from tty port */

void
curses_bail(const char *mesg)
{
    clearlocks();
    curses_exit_nhwindows(mesg);
    nh_terminate(EXIT_SUCCESS);
}


/* Return a winid for a new window of the given type */

winid
curses_get_wid(int type)
{
    static winid menu_wid = 20; /* Always even */
    static winid text_wid = 21; /* Always odd */
    winid ret;

    switch (type) {
    case NHW_MESSAGE:
        return MESSAGE_WIN;
    case NHW_MAP:
        return MAP_WIN;
    case NHW_STATUS:
        return STATUS_WIN;
    case NHW_MENU:
        ret = menu_wid;
        break;
    case NHW_TEXT:
        ret = text_wid;
        break;
    default:
        impossible("curses_get_wid: unsupported window type");
        ret = -1;
    }

    while (curses_window_exists(ret)) {
        ret += 2;
        if ((ret + 2) > 10000) {        /* Avoid "wid2k" problem */
            ret -= 9900;
        }
    }

    if (type == NHW_MENU) {
        menu_wid += 2;
    } else {
        text_wid += 2;
    }

    return ret;
}


/*
 * Allocate a copy of the given string.  If null, return a string of
 * zero length.
 *
 * This is taken from copy_of() in tty/wintty.c.
 */

char *
curses_copy_of(const char *s)
{
    if (!s)
        s = "";
    return dupstr(s);
}


/* Determine the number of lines needed for a string for a dialog window
   of the given width */

int
curses_num_lines(const char *str, int width)
{
    int last_space, count;
    int curline = 1;
    char substr[BUFSZ];
    char tmpstr[BUFSZ];

    strncpy(substr, str, BUFSZ-1);
    substr[BUFSZ-1] = '\0';

    while (strlen(substr) > (size_t) width) {
        last_space = 0;

        for (count = 0; count <= width; count++) {
            if (substr[count] == ' ')
                last_space = count;

        }
        if (last_space == 0) {  /* No spaces found */
            last_space = count - 1;
        }
        for (count = (last_space + 1); count < (int) strlen(substr); count++) {
            tmpstr[count - (last_space + 1)] = substr[count];
        }
        tmpstr[count - (last_space + 1)] = '\0';
        strcpy(substr, tmpstr);
        curline++;
    }

    return curline;
}


/* Break string into smaller lines to fit into a dialog window of the
given width */

char *
curses_break_str(const char *str, int width, int line_num)
{
    int last_space, count;
    char *retstr;
    int curline = 0;
    int strsize = (int) strlen(str) + 1;
#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) && !defined(_MSC_VER)
    char substr[strsize];
    char curstr[strsize];
    char tmpstr[strsize];

    strcpy(substr, str);
#else
#ifndef BUFSZ
#define BUFSZ 256
#endif
    char substr[BUFSZ * 2];
    char curstr[BUFSZ * 2];
    char tmpstr[BUFSZ * 2];

    if (strsize > (BUFSZ * 2) - 1) {
        paniclog("curses", "curses_break_str() string too long.");
        strncpy(substr, str, (BUFSZ * 2) - 2);
        substr[(BUFSZ * 2) - 1] = '\0';
    } else
        strcpy(substr, str);
#endif

    while (curline < line_num) {
        if (strlen(substr) == 0) {
            break;
        }
        curline++;
        last_space = 0;
        for (count = 0; count <= width; count++) {
            if (substr[count] == ' ') {
                last_space = count;
            } else if (substr[count] == '\0') {
                last_space = count;
                break;
            }
        }
        if (last_space == 0) {  /* No spaces found */
            last_space = count - 1;
        }
        for (count = 0; count < last_space; count++) {
            curstr[count] = substr[count];
        }
        curstr[count] = '\0';
        if (substr[count] == '\0') {
            break;
        }
        for (count = (last_space + 1); count < (int) strlen(substr); count++) {
            tmpstr[count - (last_space + 1)] = substr[count];
        }
        tmpstr[count - (last_space + 1)] = '\0';
        strcpy(substr, tmpstr);
    }

    if (curline < line_num) {
#if 0
        return NULL;
#else
        /* callers aren't prepared to handle NULL return */
        Strcpy(curstr, "");
#endif
    }

    retstr = curses_copy_of(curstr);

    return retstr;
}


/* Return the remaining portion of a string after hacking-off line_num lines */

char *
curses_str_remainder(const char *str, int width, int line_num)
{
    int last_space, count;
    char *retstr;
    int curline = 0;
    int strsize = strlen(str) + 1;
#if (__STDC_VERSION__ >= 199901L) && !defined(_MSC_VER)
    char substr[strsize];
    char tmpstr[strsize];

    strcpy(substr, str);
#else
#ifndef BUFSZ
#define BUFSZ 256
#endif
    char substr[BUFSZ * 2];
    char tmpstr[BUFSZ * 2];

    if (strsize > (BUFSZ * 2) - 1) {
        paniclog("curses", "curses_str_remainder() string too long.");
        strncpy(substr, str, (BUFSZ * 2) - 2);
        substr[(BUFSZ * 2) - 1] = '\0';
    } else
        strcpy(substr, str);
#endif

    while (curline < line_num) {
        if (strlen(substr) == 0) {
            break;
        }
        curline++;
        last_space = 0;
        for (count = 0; count <= width; count++) {
            if (substr[count] == ' ') {
                last_space = count;
            } else if (substr[count] == '\0') {
                last_space = count;
                break;
            }
        }
        if (last_space == 0) {  /* No spaces found */
            last_space = count - 1;
        }
        assert(IndexOk(last_space, substr));
        if (substr[last_space] == '\0') {
            break;
        }
        for (count = (last_space + 1); count < (int) strlen(substr); count++) {
            tmpstr[count - (last_space + 1)] = substr[count];
        }
        tmpstr[count - (last_space + 1)] = '\0';
        strcpy(substr, tmpstr);
    }

    if (curline < line_num) {
        return NULL;
    }

    retstr = curses_copy_of(substr);

    return retstr;
}


/* Determine if the given NetHack winid is a menu window */

boolean
curses_is_menu(winid wid)
{
    if ((wid > 19) && !(wid % 2)) {     /* Even number */
        return TRUE;
    } else {
        return FALSE;
    }
}


/* Determine if the given NetHack winid is a text window */

boolean
curses_is_text(winid wid)
{
    if ((wid > 19) && (wid % 2)) {      /* Odd number */
        return TRUE;
    } else {
        return FALSE;
    }
}

/* convert nethack's DECgraphics encoding into curses' ACS encoding */
int
curses_convert_glyph(int ch, int glyph)
{
    /* The DEC line drawing characters use 0x5f through 0x7e instead
       of the much more straightforward 0x60 through 0x7f, possibly
       because 0x7f is effectively a control character (Rubout);
       nethack ORs 0x80 to flag line drawing--that's stripped below */
    static int decchars[33]; /* for chars 0x5f through 0x7f (95..127) */

    ch &= 0xff; /* 0..255 only */
    if (!(ch & 0x80))
        return ch; /* no conversion needed */

    /* this conversion routine is only called for SYMHANDLING(H_DEC) and
       we decline to support special graphics symbols on the rogue level */
    if (Is_rogue_level(&u.uz)) {
        /* attempting to use line drawing characters will end up being
           rendered as lowercase gibberish */
        ch &= ~0x80;
        return ch;
    }

    /*
     * Curses has complete access to all characters that DECgraphics uses.
     * However, their character value isn't consistent between terminals
     * and implementations.  For actual DEC terminals and faithful emulators,
     * line-drawing characters are specified as lowercase letters (mostly)
     * and a control code is sent to the terminal telling it to switch
     * character sets (that's how the tty interface handles them).
     * Curses remaps the characters instead.
     */

    /* one-time initialization; some ACS_x aren't compile-time constant */
    if (!decchars[0]) {
        /* [0] is non-breakable space; irrelevant to nethack */
        decchars[0x5f - 0x5f] = ' '; /* NBSP */
        decchars[0x60 - 0x5f] = ACS_DIAMOND; /* [1] solid diamond */
        decchars[0x61 - 0x5f] = ACS_CKBOARD; /* [2] checkerboard */
        /* several "line drawing" characters are two-letter glyphs
           which could be substituted for invisible control codes;
           nethack's DECgraphics doesn't use any of them so we're
           satisfied with conversion to a simple letter;
           [3] "HT" as one char, with small raised upper case H over
           and/or preceding small lowered upper case T */
        decchars[0x62 - 0x5f] = 'H'; /* "HT" (horizontal tab) */
        decchars[0x63 - 0x5f] = 'F'; /* "FF" as one char (form feed) */
        decchars[0x64 - 0x5f] = 'C'; /* "CR" as one (carriage return) */
        decchars[0x65 - 0x5f] = 'L'; /* [6] "LF" as one (line feed) */
        decchars[0x66 - 0x5f] = ACS_DEGREE; /* small raised circle */
        /* [8] plus or minus sign, '+' with horizontal line below */
        decchars[0x67 - 0x5f] = ACS_PLMINUS;
        decchars[0x68 - 0x5f] = 'N'; /* [9] "NL" as one char (new line) */
        decchars[0x69 - 0x5f] = 'V'; /* [10] "VT" as one (vertical tab) */
        decchars[0x6a - 0x5f] = ACS_LRCORNER; /* lower right corner */
        decchars[0x6b - 0x5f] = ACS_URCORNER; /* upper right corner, 7-ish */
        decchars[0x6c - 0x5f] = ACS_ULCORNER; /* upper left corner */
        decchars[0x6d - 0x5f] = ACS_LLCORNER; /* lower left corner, 'L' */
        /* [15] center cross, like big '+' sign */
        decchars[0x6e - 0x5f] = ACS_PLUS;
        decchars[0x6f - 0x5f] = ACS_S1; /* very high horizontal line */
        decchars[0x70 - 0x5f] = ACS_S3; /* medium high horizontal line */
        decchars[0x71 - 0x5f] = ACS_HLINE; /* centered horizontal line */
        decchars[0x72 - 0x5f] = ACS_S7; /* medium low horizontal line */
        decchars[0x73 - 0x5f] = ACS_S9; /* very low horizontal line */
        /* [21] left tee, 'H' with right-hand vertical stroke removed;
           note on left vs right:  the ACS name (also DEC's terminal
           documentation) refers to vertical bar rather than cross stroke,
           nethack's left/right refers to direction of the cross stroke */
        decchars[0x74 - 0x5f] = ACS_LTEE; /* ACS left tee, NH right tee */
        /* [22] right tee, 'H' with left-hand vertical stroke removed */
        decchars[0x75 - 0x5f] = ACS_RTEE; /* ACS right tee, NH left tee */
        /* [23] bottom tee, '+' with lower half of vertical stroke
           removed and remaining stroke pointed up (unside-down 'T');
           nethack is inconsistent here--unlike with left/right, its
           bottom/top directions agree with ACS */
        decchars[0x76 - 0x5f] = ACS_BTEE; /* bottom tee, stroke up */
        /* [24] top tee, '+' with upper half of vertical stroke removed */
        decchars[0x77 - 0x5f] = ACS_TTEE; /* top tee, stroke down, 'T' */
        decchars[0x78 - 0x5f] = ACS_VLINE; /* centered vertical line */
        decchars[0x79 - 0x5f] = ACS_LEQUAL; /* less than or equal to */
        /* [27] greater than or equal to, '>' with underscore */
        decchars[0x7a - 0x5f] = ACS_GEQUAL;
        /* [28] Greek pi ('n'-like; case is ambiguous: small size
           suggests lower case but flat top suggests upper case) */
        decchars[0x7b - 0x5f] = ACS_PI;
        /* [29] not equal sign, combination of '=' and '/' */
        decchars[0x7c - 0x5f] = ACS_NEQUAL;
        /* [30] British pound sign (curly 'L' with embellishments) */
        decchars[0x7d - 0x5f] = ACS_STERLING;
        decchars[0x7e - 0x5f] = ACS_BULLET; /* [31] centered dot */
        /* [32] is not used for DEC line drawing but is a potential
           value for someone who assumes that 0x60..0x7f is the valid
           range, so we're prepared to accept--and sanitize--it */
        decchars[0x7f - 0x5f] = '?';
    }

    /* high bit set means special handling */
    if (ch & 0x80) {
        int convindx, symbol;

        ch &= ~0x80; /* force plain ASCII for last resort */
        convindx = ch - 0x5f;
        /* if it's in the lower case block of ASCII (which includes
           a few punctuation characters), use the conversion table */
        if (convindx >= 0 && convindx < SIZE(decchars)) {
            ch = decchars[convindx];
            /* in case ACS_foo maps to 0 when current terminal is unable
               to handle a particular character; if so, revert to default
               rather than using DECgr value with high bit stripped */
            if (!ch) {
                symbol = glyph_to_cmap(glyph);
                ch = (int) defsyms[symbol].sym;
            }
        }
    }

    return ch;
}


/* Move text cursor to specified coordinates in the given NetHack window */

void
curses_move_cursor(winid wid, int x, int y)
{
    int sx, sy, ex, ey;
    int xadj = 0;
    int yadj = 0;

#ifndef PDCURSES
    WINDOW *win = curses_get_nhwin(MAP_WIN);
#endif

    if (wid != MAP_WIN) {
        return;
    }
#ifdef PDCURSES
    /* PDCurses seems to not handle wmove correctly, so we use move and
       physical screen coordinates instead */
    curses_get_window_xy(wid, &xadj, &yadj);
#endif
    curs_x = x + xadj;
    curs_y = y + yadj;
    curses_map_borders(&sx, &sy, &ex, &ey, x, y);

    if (curses_window_has_border(wid)) {
        curs_x++;
        curs_y++;
    }

    if (x >= sx && x <= ex && y >= sy && y <= ey) {
        /* map column #0 isn't used; shift column #1 to first screen column */
        curs_x -= (sx + 1);
        curs_y -= sy;
#ifdef PDCURSES
        move(curs_y, curs_x);
#else
        wmove(win, curs_y, curs_x);
#endif
    }
}

/* update the ncurses stdscr cursor to where the cursor in our map is */
void
curses_update_stdscr_cursor(void)
{
#ifndef PDCURSES
    int xadj = 0, yadj = 0;

    curses_get_window_xy(MAP_WIN, &xadj, &yadj);
    move(curs_y + yadj, curs_x + xadj);
#endif
}

/* Perform actions that should be done every turn before nhgetch() */

void
curses_prehousekeeping(void)
{
#ifndef PDCURSES
    WINDOW *win = curses_get_nhwin(MAP_WIN);
#endif /* PDCURSES */

    if ((curs_x > -1) && (curs_y > -1)) {
        curs_set(1);
#ifdef PDCURSES
        /* PDCurses seems to not handle wmove correctly, so we use move
           and physical screen coordinates instead */
        move(curs_y, curs_x);
#else
        wmove(win, curs_y, curs_x);
#endif /* PDCURSES */
        curses_refresh_nhwin(MAP_WIN);
    }
}


/* Perform actions that should be done every turn after nhgetch() */

void
curses_posthousekeeping(void)
{
    curs_set(0);
    /* curses_decrement_highlights(FALSE); */
    curses_clear_unhighlight_message_window();
}


void
curses_view_file(const char *filename, boolean must_exist)
{
    winid wid;
    anything Id;
    char buf[BUFSZ];
    menu_item *selected = NULL;
    dlb *fp = dlb_fopen(filename, "r");
    int clr = NO_COLOR;

    if (fp == NULL) {
        if (must_exist)
            pline("Cannot open \"%s\" for reading!", filename);
        return;
    }

    wid = curses_get_wid(NHW_MENU);
    curses_create_nhmenu(wid, 0UL);
    Id = cg.zeroany;

    while (dlb_fgets(buf, BUFSZ, fp) != NULL) {
        curses_add_menu(wid, &nul_glyphinfo, &Id, 0, 0,
                        A_NORMAL, clr, buf, FALSE);
    }

    dlb_fclose(fp);
    curses_end_menu(wid, "");
    curses_select_menu(wid, PICK_NONE, &selected);
    curses_del_wid(wid);
}


void
curses_rtrim(char *str)
{
    char *s;

    for (s = str; *s != '\0'; ++s);
    if (s > str)
        for (--s; isspace(*s) && s > str; --s);
    if (s == str)
        *s = '\0';
    else
        *(++s) = '\0';
}


/* Read numbers until non-digit is encountered, and return number
in int form. */

long
curses_get_count(int first_digit)
{
    int current_char;
    long current_count = 0L;

    /* use core's count routine; we have the first digit; if any more
       are typed, get_count() will send "Count:123" to the message window;
       curses's message window will display that in count window instead */
    current_char = get_count(NULL, (char) first_digit,
                             /* 0L => no limit on value unless it wraps
                              * to negative */
                             0L, &current_count,
                             /* don't put into message history, echo full
                              * number rather than waiting until 2nd digit */
                             GC_ECHOFIRST);

    ungetch(current_char);
    if (current_char == '\033') {     /* Cancelled with escape */
        current_count = -1;
    }
    return current_count;
}


/* Convert the given NetHack text attributes into the format curses
   understands, and return that format mask. */

attr_t
curses_convert_attr(int attr)
{
    attr_t curses_attr;

    /* first, strip off control flags masked onto the display attributes
       (caller should have already done this...) */
    attr &= ~(ATR_URGENT | ATR_NOHISTORY);

    switch (attr) {
    case ATR_NONE:
        curses_attr = A_NORMAL;
        break;
    case ATR_ULINE:
        curses_attr = A_UNDERLINE;
        break;
    case ATR_BOLD:
        curses_attr = A_BOLD;
        break;
    case ATR_DIM:
        curses_attr = A_DIM;
        break;
    case ATR_BLINK:
        curses_attr = A_BLINK;
        break;
    case ATR_INVERSE:
        curses_attr = A_REVERSE;
        break;
    case ATR_ITALIC:
        curses_attr = A_ITALIC;
        break;
    default:
        curses_attr = A_NORMAL;
    }

    return curses_attr;
}

/* Convert special keys into values that NetHack can understand.
Currently this is limited to arrow keys, but this may be expanded. */
int
curses_convert_keys(int key)
{
    boolean reject = (program_state.input_state == otherInp),
            as_is = FALSE, numpad_esc = FALSE;
    int ret = key;

    if (modifiers_available)
        update_modifiers();

    /* Handle arrow and keypad keys, but only when getting a command
       (or a command-like keystroke for getpos() or getdir()). */
    switch (key) {
    case SS3: /* M-^O, 8-bit version of ESC 'O' c for keypad key */
    case '\033': /* ESC or ^[ */
        /* changes ESC c to M-c or number pad key to corresponding digit
           (but we only get here via key==ESC if curses' getch() didn't
           change the latter to KEY_xyz) */
        ret = parse_escape_sequence(key, &numpad_esc);
        reject = ((uchar) ret < 1 || ret > 255);
        as_is = !numpad_esc; /* don't perform phonepad inversion */
        break;
    case KEY_BACKSPACE:
        /* we can't distinguish between a separate backspace key and
           explicit Ctrl+H intended to rush to the left; without this,
           a value for ^H greater than 255 is passed back to core's
           readchar() and stripping the value down to 0..255 yields ^G! */
        ret = C('H');
        FALLTHROUGH;
        /*FALLTHRU*/
    default:
        if (modifiers_available)
            ret = modified(ret);
#if defined(ALT_A) && defined(ALT_Z)
        /* for PDcurses, but doesn't handle Alt+X for upper case X;
           ncurses doesn't have ALT_x definitions so we achieve a similar
           effect via parse_escape_sequence(), and that works for upper
           case and other non-letter, non-digit keys */
        if (ret >= ALT_A && ret <= ALT_Z) {
            ret = (ret - ALT_A) + 'a';
            ret = M(ret);
        }
#endif
#if defined(ALT_0) && defined(ALT_9)
        if (ret >= ALT_0 && ret <= ALT_9) {
            ret = (ret - ALT_0) + '0';
            ret = M(ret);
        }
#endif
        /* use key as-is unless it's out of normal char range */
        reject = ((uchar) ret < 1 || ret > 255);
        as_is = TRUE;
        break;
#ifdef KEY_B1
    case KEY_B1:
#endif
    case KEY_LEFT:
        ret = iflags.num_pad ? '4' : 'h';
        break;
#ifdef KEY_B3
    case KEY_B3:
#endif
    case KEY_RIGHT:
        ret = iflags.num_pad ? '6' : 'l';
        break;
#ifdef KEY_A2
    case KEY_A2:
#endif
    case KEY_UP:
        ret = iflags.num_pad ? '8' : 'k';
        break;
#ifdef KEY_C2
    case KEY_C2:
#endif
    case KEY_DOWN:
        ret = iflags.num_pad ? '2' : 'j';
        break;
#ifdef KEY_A1
    case KEY_A1:
#endif
    case KEY_HOME:
        ret = iflags.num_pad ? '7' : (!gc.Cmd.swap_yz ? 'y' : 'z');
        break;
#ifdef KEY_A3
    case KEY_A3:
#endif
    case KEY_PPAGE:
        ret = iflags.num_pad ? '9' : 'u';
        break;
#ifdef KEY_C1
    case KEY_C1:
#endif
    case KEY_END:
        ret = iflags.num_pad ? '1' : 'b';
        break;
#ifdef KEY_C3
    case KEY_C3:
#endif
    case KEY_NPAGE:
        ret = iflags.num_pad ? '3' : 'n';
        break;
#ifdef KEY_B2
    case KEY_B2:
        ret = iflags.num_pad ? '5' : 'g';
        break;
#endif /* KEY_B2 */
#ifdef KEY_RESIZE
    case KEY_RESIZE:
        /* actual resize is handled elsewhere; just avoid beep/bell here */
        ret = '\033'; /* was C('R'); -- nethack's redraw command */
        reject = FALSE;
        break;
#endif
    }

    /* phone layout is inverted, 123 on top and 789 on bottom; if player has
       set num_pad to deal with that, we need to invert here too but only
       when some key has been converted into a digit, not for actual digit */
    if (iflags.num_pad && (iflags.num_pad_mode & 2) != 0 && !as_is) {
        if (ret >= '1' && ret <= '3')
            ret += 6; /* 1,2,3 -> 7,8,9 */
        else if (ret >= '7' && ret <= '9')
            ret -= 6; /* 7,8,9 -> 1,2,3 */
    }

    if (reject) {
        /* an arrow or function key has been pressed during text entry */
        curses_nhbell(); /* calls beep() which might cause unwanted screen
                          * refresh if terminal is set for 'visible bell' */
        ret = '\033'; /* ESC */
    }

    return ret;
}

/*
 * We treat buttons 2 and 3 as equivalent so that it doesn't matter which
 * one is for right-click and which for middle-click.  The core uses CLICK_2
 * for right-click ("not left"-click) even though 2 might be middle button.
 *
 * BUTTON_CTRL was enabled at one point but was not working as intended.
 * Ctrl+left_click was generating pairs of duplicated events with Ctrl and
 * Report_mouse_position bits set (even though Report_mouse_position wasn't
 * enabled) but no button click bit set.  (It sort of worked because Ctrl+
 * Report_mouse_position wasn't a left click so passed along CLICK_2, but
 * the duplication made that too annoying to use.  Attempting to immediately
 * drain the second one wasn't working as intended either.)
 */
#define MOUSEBUTTONS (BUTTON1_CLICKED | BUTTON2_CLICKED | BUTTON3_CLICKED)

/* Process mouse events.  Mouse movement is processed until no further
mouse movement events are available.  Returns 0 for a mouse click
event, or the first non-mouse key event in the case of mouse
movement. */

int
curses_get_mouse(coordxy *mousex, coordxy *mousey, int *mod)
{
    int key = '\033';

#ifdef NCURSES_MOUSE_VERSION
    MEVENT event;

    if (getmouse(&event) == OK) { /* True if user has clicked */
        if ((event.bstate & MOUSEBUTTONS) != 0) {
        /*
         * The ncurses man page documents wmouse_trafo() incorrectly.
         * It says that last argument 'TRUE' translates from screen
         * to window and 'FALSE' translates from window to screen,
         * but those are backwards.  The mouse_trafo() macro calls
         * last argument 'to_screen', suggesting that the backwards
         * implementation is the intended behavior and the man page
         * is describing it wrong.
         */
            /* See if coords are in map window & convert coords */
            if (wmouse_trafo(mapwin, &event.y, &event.x, FALSE)) {
                key = '\0'; /* core uses this to detect a mouse click */
                *mousex = event.x + 1; /* +1: screen 0..78 is map 1..79 */
                *mousey = event.y;

                if (curses_window_has_border(MAP_WIN)) {
                    (*mousex)--;
                    (*mousey)--;
                }

                *mod = ((event.bstate & (BUTTON1_CLICKED | BUTTON_CTRL))
                        == BUTTON1_CLICKED) ? CLICK_1 : CLICK_2;
            }
        }
    }
#else
    nhUse(mousex);
    nhUse(mousey);
    nhUse(mod);
#endif /* NCURSES_MOUSE_VERSION */

    return key;
}

void
curses_mouse_support(int mode) /* 0: off, 1: on, 2: alternate on */
{
#ifdef NCURSES_MOUSE_VERSION
    mmask_t result, oldmask, newmask;

    if (!mode)
        newmask = 0;
    else
        newmask = MOUSEBUTTONS; /* buttons 1, 2, and 3 */

    result = mousemask(newmask, &oldmask);
    nhUse(result);
#else
    nhUse(mode);
#endif
}

/* caller just got an input character of ESC or M-^O;
   note: curses converts a lot of escape sequences to single values greater
   than 255 and those won't look like ESC to caller so won't get here */
static int
parse_escape_sequence(int key, boolean *keypadnum)
{
#ifndef PDCURSES
    int ret, keypadother = 0;

    *keypadnum = FALSE;

    timeout(10);
    ret = getch();

    if (ret == 'O' || key == SS3) { /* handle numeric keypad */
        /*
         * ESC O <pending> or M-^O <something|nothing>.
         *
         * For the former, we don't have the next char yet so get it now.
         * If there isn't one, treat ESC O as if user typed M-O (which
         * is probably the case, via alt+shift+O combo sending two char
         * "ESC O").
         *
         * For the latter, it there wasn't another char then 'ret' will
         * be ERR and we'll treat the result as M-^O.  However, if there
         * is another char and it is O meant as two characters "M-^O O"
         * we'll be fooled, but that's not a valid escape sequence so
         * don't worry about those two characters arriving together.
         */
        if (key == '\033')
            ret = getch();

        if (ret == ERR) {
            iflags.term_gone = 1;
            /* there was no additional char; treat as M-O or M-^O below */
            ret = (key == '\033') ? 'O' : C('O');
        } else if (ret >= 112 && ret <= 121) { /* 'p'..'y' */
            *keypadnum = TRUE; /* convert 'p'..'y' to '0'..'9' below */
        } else if (ret >= 108 && ret <= 110) { /* 'l'..'n' */
            keypadother = 1;   /* convert 'l','m','n' to ',','.','-' below */
        } else if (ret == 'M') {
            keypadother = 2;   /* convert "ESC O M" or "SS3 M" to ^M */
        }
    }

    timeout(-1); /* reset to 'wait unlimited time for next input' */

    if (*keypadnum) {
        /* 'p' -> '0', ..., 'y' -> '9' */
        ret -= ('p' - '0');         /* Convert c from 'ESC O c' to digit */
    } else if (keypadother > 0) {
        /* conversion for VT keypad keys (no plus; ignore PF1 through PF4)
           [typical PC keyboard has period and plus, no comma or minus] */
        if (keypadother == 1)
            ret -= ('l' - ',');     /* keypad comma, period, or minus */
        else
            ret = C('M');           /* keypad <enter> */
    } else if (ret != ERR && ret <= 255) {
        /* ESC <something>; effectively 'altmeta' behind player's back */
        ret = M(ret);               /* Meta key support for most terminals */
    } else {
        ret = '\033';               /* Just an escape character */
    }

    return ret;
#else
    nhUse(key);
    nhUse(keypadnum);
    return '\033';
#endif /* !PDCURSES */
}

#undef SS3

/* update_modifiers() and modified() will never be
   called if modifiers_available is FALSE */

static void
update_modifiers(void)
{
#if defined(PDCURSES) && defined(PDC_KEY_MODIFIER_ALT)
    last_getch_modifiers = PDC_get_key_modifiers();
#endif
}

static int
modified(int ch)
{
    int ret_ch = ch;

#if defined(PDCURSES) && defined(PDC_KEY_MODIFIER_ALT)
    /* PDCurses key modifier masks:
     * PDC_KEY_MODIFIER_SHIFT   = 1
     * PDC_KEY_MODIFIER_CONTROL = 2
     * PDC_KEY_MODIFIER_ALT     = 4
     * PDC_KEY_MODIFIER_NUMLOCK = 8
     * PDC_KEY_MODIFIER_REPEAT  = 16
     * ALT + 'a' through ALT + 'z' returns ALT_A  through ALT_Z
     *    and those are out of the normal character range and
     *    code in curses_convert_keys() handles those.
     * ALT + 'A' through ALT + 'Z' return normal 'A' through 'Z'
     *    so we check the modifier here.
     */
    if (((last_getch_modifiers & PDC_KEY_MODIFIER_ALT) == PDC_KEY_MODIFIER_ALT)
        && (ch >= 'A' && ch <= 'Z'))
        ret_ch = M(ch);
#endif
    return ret_ch;
}

/*cursmisc.c*/
