/* Public Domain Curses */

#include <curspriv.h>

/*man-start**************************************************************

addch
-----

### Synopsis

    int addch(const chtype ch);
    int waddch(WINDOW *win, const chtype ch);
    int mvaddch(int y, int x, const chtype ch);
    int mvwaddch(WINDOW *win, int y, int x, const chtype ch);
    int echochar(const chtype ch);
    int wechochar(WINDOW *win, const chtype ch);

    int addrawch(chtype ch);
    int waddrawch(WINDOW *win, chtype ch);
    int mvaddrawch(int y, int x, chtype ch);
    int mvwaddrawch(WINDOW *win, int y, int x, chtype ch);

    int add_wch(const cchar_t *wch);
    int wadd_wch(WINDOW *win, const cchar_t *wch);
    int mvadd_wch(int y, int x, const cchar_t *wch);
    int mvwadd_wch(WINDOW *win, int y, int x, const cchar_t *wch);
    int echo_wchar(const cchar_t *wch);
    int wecho_wchar(WINDOW *win, const cchar_t *wch);

### Description

   addch() adds the chtype ch to the default window (stdscr) at the
   current cursor position, and advances the cursor. Note that
   chtypes can convey both text (a single character) and
   attributes, including a color pair. add_wch() is the wide-
   character version of this function, taking a pointer to a
   cchar_t instead of a chtype.

   waddch() is like addch(), but also lets you specify the window.
   (This is in fact the core output routine.) wadd_wch() is the
   wide version.

   mvaddch() moves the cursor to the specified (y, x) position, and
   adds ch to stdscr. mvadd_wch() is the wide version.

   mvwaddch() moves the cursor to the specified position and adds
   ch to the specified window. mvwadd_wch() is the wide version.

   echochar() adds ch to stdscr at the current cursor position and
   calls refresh(). echo_wchar() is the wide version.

   wechochar() adds ch to the specified window and calls
   wrefresh(). wecho_wchar() is the wide version.

   addrawch(), waddrawch(), mvaddrawch() and mvwaddrawch() are
   PDCurses-specific wrappers for addch() etc. that disable the
   translation of control characters.

   The following applies to all these functions:

   If the cursor moves on to the right margin, an automatic newline
   is performed.  If scrollok is enabled, and a character is added
   to the bottom right corner of the window, the scrolling region
   will be scrolled up one line.  If scrolling is not allowed, ERR
   will be returned.

   If ch is a tab, newline, or backspace, the cursor will be moved
   appropriately within the window.  If ch is a newline, the
   clrtoeol routine is called before the cursor is moved to the
   beginning of the next line.  If newline mapping is off, the
   cursor will be moved to the next line, but the x coordinate will
   be unchanged.  If ch is a tab the cursor is moved to the next
   tab position within the window.  If ch is another control
   character, it will be drawn in the ^X notation.  Calling the
   inch() routine after adding a control character returns the
   representation of the control character, not the control
   character.

   Video attributes can be combined with a character by ORing them
   into the parameter. Text, including attributes, can be copied
   from one place to another by using inch() and addch().

   Note that in PDCurses, for now, a cchar_t and a chtype are the
   same. The text field is 16 bits wide, and is treated as Unicode
   (UCS-2) when PDCurses is built with wide-character support
   (define PDC_WIDE). So, in functions that take a chtype, like
   addch(), both the wide and narrow versions will handle Unicode.
   But for portability, you should use the wide functions.

### Return Value

   All functions return OK on success and ERR on error.

### Portability
                             X/Open    BSD    SYS V
    addch                       Y       Y       Y
    waddch                      Y       Y       Y
    mvaddch                     Y       Y       Y
    mvwaddch                    Y       Y       Y
    echochar                    Y       -      3.0
    wechochar                   Y       -      3.0
    addrawch                    -       -       -
    waddrawch                   -       -       -
    mvaddrawch                  -       -       -
    mvwaddrawch                 -       -       -
    add_wch                     Y
    wadd_wch                    Y
    mvadd_wch                   Y
    mvwadd_wch                  Y
    echo_wchar                  Y
    wecho_wchar                 Y

**man-end****************************************************************/

int waddch(WINDOW *win, const chtype ch)
{
    int x, y;
    chtype text, attr;
    bool xlat;

    PDC_LOG(("waddch() - called: win=%p ch=%x (text=%c attr=0x%x)\n",
             win, ch, ch & A_CHARTEXT, ch & A_ATTRIBUTES));

    if (!win)
        return ERR;

    x = win->_curx;
    y = win->_cury;

    if (y > win->_maxy || x > win->_maxx || y < 0 || x < 0)
        return ERR;

    xlat = !SP->raw_out && !(ch & A_ALTCHARSET);
    text = ch & A_CHARTEXT;
    attr = ch & A_ATTRIBUTES;

    if (xlat && (text < ' ' || text == 0x7f))
    {
        int x2;

        switch (text)
        {
        case '\t':
            for (x2 = ((x / TABSIZE) + 1) * TABSIZE; x < x2; x++)
            {
                if (waddch(win, attr | ' ') == ERR)
                    return ERR;

                /* if tab to next line, exit the loop */

                if (!win->_curx)
                    break;
            }
            return OK;

        case '\n':
            /* if lf -> crlf */

            if (!SP->raw_out)
                x = 0;

            wclrtoeol(win);

            if (++y > win->_bmarg)
            {
                y--;

                if (wscrl(win, 1) == ERR)
                    return ERR;
            }

            break;

        case '\b':
            /* don't back over left margin */

            if (--x < 0)
        case '\r':
                x = 0;

            break;

        case 0x7f:
            if (waddch(win, attr | '^') == ERR)
                return ERR;

            return waddch(win, attr | '?');

        default:
            /* handle control chars */

            if (waddch(win, attr | '^') == ERR)
                return ERR;

            return waddch(win, ch + '@');
        }
    }
    else
    {
        /* If the incoming character doesn't have its own attribute,
           then use the current attributes for the window. If it has
           attributes but not a color component, OR the attributes to
           the current attributes for the window. If it has a color
           component, use the attributes solely from the incoming
           character. */

        if (!(attr & A_COLOR))
            attr |= win->_attrs;

        /* wrs (4/10/93): Apply the same sort of logic for the window
           background, in that it only takes precedence if other color
           attributes are not there and that the background character
           will only print if the printing character is blank. */

        if (!(attr & A_COLOR))
            attr |= win->_bkgd & A_ATTRIBUTES;
        else
            attr |= win->_bkgd & (A_ATTRIBUTES ^ A_COLOR);

        if (text == ' ')
            text = win->_bkgd & A_CHARTEXT;

        /* Add the attribute back into the character. */

        text |= attr;

        /* Only change _firstch/_lastch if the character to be added is
           different from the character/attribute that is already in
           that position in the window. */

        if (win->_y[y][x] != text)
        {
            if (win->_firstch[y] == _NO_CHANGE)
                win->_firstch[y] = win->_lastch[y] = x;
            else
                if (x < win->_firstch[y])
                    win->_firstch[y] = x;
                else
                    if (x > win->_lastch[y])
                        win->_lastch[y] = x;

            win->_y[y][x] = text;
        }

        if (++x >= win->_maxx)
        {
            /* wrap around test */

            x = 0;

            if (++y > win->_bmarg)
            {
                y--;

                if (wscrl(win, 1) == ERR)
                {
                    PDC_sync(win);
                    return ERR;
                }
            }
        }
    }

    win->_curx = x;
    win->_cury = y;

    if (win->_immed)
        wrefresh(win);
    if (win->_sync)
        wsyncup(win);

    return OK;
}

int addch(const chtype ch)
{
    PDC_LOG(("addch() - called: ch=%x\n", ch));

    return waddch(stdscr, ch);
}

int mvaddch(int y, int x, const chtype ch)
{
    PDC_LOG(("mvaddch() - called: y=%d x=%d ch=%x\n", y, x, ch));

    if (move(y,x) == ERR)
        return ERR;

    return waddch(stdscr, ch);
}

int mvwaddch(WINDOW *win, int y, int x, const chtype ch)
{
    PDC_LOG(("mvwaddch() - called: win=%p y=%d x=%d ch=%d\n", win, y, x, ch));

    if (wmove(win, y, x) == ERR)
        return ERR;

    return waddch(win, ch);
}

int echochar(const chtype ch)
{
    PDC_LOG(("echochar() - called: ch=%x\n", ch));

    return wechochar(stdscr, ch);
}

int wechochar(WINDOW *win, const chtype ch)
{
    PDC_LOG(("wechochar() - called: win=%p ch=%x\n", win, ch));

    if (waddch(win, ch) == ERR)
        return ERR;

    return wrefresh(win);
}

int waddrawch(WINDOW *win, chtype ch)
{
    PDC_LOG(("waddrawch() - called: win=%p ch=%x (text=%c attr=0x%x)\n",
             win, ch, ch & A_CHARTEXT, ch & A_ATTRIBUTES));

    if ((ch & A_CHARTEXT) < ' ' || (ch & A_CHARTEXT) == 0x7f)
        ch |= A_ALTCHARSET;

    return waddch(win, ch);
}

int addrawch(chtype ch)
{
    PDC_LOG(("addrawch() - called: ch=%x\n", ch));

    return waddrawch(stdscr, ch);
}

int mvaddrawch(int y, int x, chtype ch)
{
    PDC_LOG(("mvaddrawch() - called: y=%d x=%d ch=%d\n", y, x, ch));

    if (move(y, x) == ERR)
        return ERR;

    return waddrawch(stdscr, ch);
}

int mvwaddrawch(WINDOW *win, int y, int x, chtype ch)
{
    PDC_LOG(("mvwaddrawch() - called: win=%p y=%d x=%d ch=%d\n",
             win, y, x, ch));

    if (wmove(win, y, x) == ERR)
        return ERR;

    return waddrawch(win, ch);
}

#ifdef PDC_WIDE
int wadd_wch(WINDOW *win, const cchar_t *wch)
{
    PDC_LOG(("wadd_wch() - called: win=%p wch=%x\n", win, *wch));

    return wch ? waddch(win, *wch) : ERR;
}

int add_wch(const cchar_t *wch)
{
    PDC_LOG(("add_wch() - called: wch=%x\n", *wch));

    return wadd_wch(stdscr, wch);
}

int mvadd_wch(int y, int x, const cchar_t *wch)
{
    PDC_LOG(("mvaddch() - called: y=%d x=%d wch=%x\n", y, x, *wch));

    if (move(y,x) == ERR)
        return ERR;

    return wadd_wch(stdscr, wch);
}

int mvwadd_wch(WINDOW *win, int y, int x, const cchar_t *wch)
{
    PDC_LOG(("mvwaddch() - called: win=%p y=%d x=%d wch=%d\n",
             win, y, x, *wch));

    if (wmove(win, y, x) == ERR)
        return ERR;

    return wadd_wch(win, wch);
}

int echo_wchar(const cchar_t *wch)
{
    PDC_LOG(("echo_wchar() - called: wch=%x\n", *wch));

    return wecho_wchar(stdscr, wch);
}

int wecho_wchar(WINDOW *win, const cchar_t *wch)
{
    PDC_LOG(("wecho_wchar() - called: win=%p wch=%x\n", win, *wch));

    if (!wch || (wadd_wch(win, wch) == ERR))
        return ERR;

    return wrefresh(win);
}
#endif
