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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcurses/base/lib_addch.c	Lines:	0	141	0.0 %
Date:	2017-11-07	Branches:	0	178	0.0 %


/* $OpenBSD: lib_addch.c,v 1.5 2010/01/12 23:22:05 nicm Exp $ */

/****************************************************************************
 * Copyright (c) 1998-2006,2008 Free Software Foundation, Inc.              *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/*
**	lib_addch.c
**
**	The routine waddch().
**
*/

#include <curses.priv.h>
#include <ctype.h>

MODULE_ID("$Id: lib_addch.c,v 1.5 2010/01/12 23:22:05 nicm Exp $")

static const NCURSES_CH_T blankchar = NewChar(BLANK_TEXT);

/*
 * Ugly microtweaking alert.  Everything from here to end of module is
 * likely to be speed-critical -- profiling data sure says it is!
 * Most of the important screen-painting functions are shells around
 * waddch().  So we make every effort to reduce function-call overhead
 * by inlining stuff, even at the cost of making wrapped copies for
 * export.  Also we supply some internal versions that don't call the
 * window sync hook, for use by string-put functions.
 */

/* Return bit mask for clearing color pair number if given ch has color */
#define COLOR_MASK(ch) (~(attr_t)((ch) & A_COLOR ? A_COLOR : 0))

static NCURSES_INLINE NCURSES_CH_T
render_char(WINDOW *win, NCURSES_CH_T ch)
/* compute a rendition of the given char correct for the current context */
{
    attr_t a = WINDOW_ATTRS(win);
    int pair = GetPair(ch);

    if (ISBLANK(ch)
	&& AttrOf(ch) == A_NORMAL
	&& pair == 0) {
	/* color/pair in attrs has precedence over bkgrnd */
	ch = win->_nc_bkgd;
	SetAttr(ch, a | AttrOf(win->_nc_bkgd));
	if ((pair = GET_WINDOW_PAIR(win)) == 0)
	    pair = GetPair(win->_nc_bkgd);
	SetPair(ch, pair);
    } else {
	/* color in attrs has precedence over bkgrnd */
	a |= AttrOf(win->_nc_bkgd) & COLOR_MASK(a);
	/* color in ch has precedence */
	if (pair == 0) {
	    if ((pair = GET_WINDOW_PAIR(win)) == 0)
		pair = GetPair(win->_nc_bkgd);
	}
#if 0
	if (pair > 255) {
	    NCURSES_CH_T fixme = ch;
	    SetPair(fixme, pair);
	}
#endif
	AddAttr(ch, (a & COLOR_MASK(AttrOf(ch))));
	SetPair(ch, pair);
    }

    TR(TRACE_VIRTPUT,
       ("render_char bkg %s (%d), attrs %s (%d) -> ch %s (%d)",
	_tracech_t2(1, CHREF(win->_nc_bkgd)),
	GetPair(win->_nc_bkgd),
	_traceattr(WINDOW_ATTRS(win)),
	GET_WINDOW_PAIR(win),
	_tracech_t2(3, CHREF(ch)),
	GetPair(ch)));

    return (ch);
}

NCURSES_EXPORT(NCURSES_CH_T)
_nc_render(WINDOW *win, NCURSES_CH_T ch)
/* make render_char() visible while still allowing us to inline it below */
{
    return render_char(win, ch);
}

/* check if position is legal; if not, return error */
#ifndef NDEBUG			/* treat this like an assertion */
#define CHECK_POSITION(win, x, y) \
	if (y > win->_maxy \
	 || x > win->_maxx \
	 || y < 0 \
	 || x < 0) { \
		TR(TRACE_VIRTPUT, ("Alert! Win=%p _curx = %d, _cury = %d " \
				   "(_maxx = %d, _maxy = %d)", win, x, y, \
				   win->_maxx, win->_maxy)); \
		return(ERR); \
	}
#else
#define CHECK_POSITION(win, x, y)	/* nothing */
#endif

static bool
newline_forces_scroll(WINDOW *win, NCURSES_SIZE_T * ypos)
{
    bool result = FALSE;

    if (*ypos >= win->_regtop && *ypos == win->_regbottom) {
	*ypos = win->_regbottom;
	result = TRUE;
    } else {
	*ypos += 1;
    }
    return result;
}

/*
 * The _WRAPPED flag is useful only for telling an application that we've just
 * wrapped the cursor.  We don't do anything with this flag except set it when
 * wrapping, and clear it whenever we move the cursor.  If we try to wrap at
 * the lower-right corner of a window, we cannot move the cursor (since that
 * wouldn't be legal).  So we return an error (which is what SVr4 does).
 * Unlike SVr4, we can successfully add a character to the lower-right corner
 * (Solaris 2.6 does this also, however).
 */
static int
wrap_to_next_line(WINDOW *win)
{
    win->_flags |= _WRAPPED;
    if (newline_forces_scroll(win, &(win->_cury))) {
	win->_curx = win->_maxx;
	if (!win->_scroll)
	    return (ERR);
	scroll(win);
    }
    win->_curx = 0;
    return (OK);
}

#if USE_WIDEC_SUPPORT
static int waddch_literal(WINDOW *, NCURSES_CH_T);
/*
 * Fill the given number of cells with blanks using the current background
 * rendition.  This saves/restores the current x-position.
 */
static void
fill_cells(WINDOW *win, int count)
{
    NCURSES_CH_T blank = blankchar;
    int save_x = win->_curx;
    int save_y = win->_cury;

    while (count-- > 0) {
	if (waddch_literal(win, blank) == ERR)
	    break;
    }
    win->_curx = save_x;
    win->_cury = save_y;
}
#endif

/*
 * Build up the bytes for a multibyte character, returning the length when
 * complete (a positive number), -1 for error and -2 for incomplete.
 */
#if USE_WIDEC_SUPPORT
NCURSES_EXPORT(int)
_nc_build_wch(WINDOW *win, ARG_CH_T ch)
{
    char *buffer = WINDOW_EXT(win, addch_work);
    int len;
    int x = win->_curx;
    int y = win->_cury;
    mbstate_t state;
    wchar_t result;

    if ((WINDOW_EXT(win, addch_used) != 0) &&
	(WINDOW_EXT(win, addch_x) != x ||
	 WINDOW_EXT(win, addch_y) != y)) {
	/* discard the incomplete multibyte character */
	WINDOW_EXT(win, addch_used) = 0;
	TR(TRACE_VIRTPUT,
	   ("Alert discarded multibyte on move (%d,%d) -> (%d,%d)",
	    WINDOW_EXT(win, addch_y), WINDOW_EXT(win, addch_x),
	    y, x));
    }
    WINDOW_EXT(win, addch_x) = x;
    WINDOW_EXT(win, addch_y) = y;

    init_mb(state);
    buffer[WINDOW_EXT(win, addch_used)] = (char) CharOf(CHDEREF(ch));
    WINDOW_EXT(win, addch_used) += 1;
    buffer[WINDOW_EXT(win, addch_used)] = '\0';
    if ((len = mbrtowc(&result,
		       buffer,
		       WINDOW_EXT(win, addch_used), &state)) > 0) {
	attr_t attrs = AttrOf(CHDEREF(ch));
	if_EXT_COLORS(int pair = GetPair(CHDEREF(ch)));
	SetChar(CHDEREF(ch), result, attrs);
	if_EXT_COLORS(SetPair(CHDEREF(ch), pair));
	WINDOW_EXT(win, addch_used) = 0;
    } else if (len == -1) {
	/*
	 * An error occurred.  We could either discard everything,
	 * or assume that the error was in the previous input.
	 * Try the latter.
	 */
	TR(TRACE_VIRTPUT, ("Alert! mbrtowc returns error"));
	/* handle this with unctrl() */
	WINDOW_EXT(win, addch_used) = 0;
    }
    return len;
}
#endif /* USE_WIDEC_SUPPORT */

static
#if !USE_WIDEC_SUPPORT		/* cannot be inline if it is recursive */
NCURSES_INLINE
#endif
int
waddch_literal(WINDOW *win, NCURSES_CH_T ch)
{
    int x;
    int y;
    struct ldat *line;

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

    CHECK_POSITION(win, x, y);

    ch = render_char(win, ch);

    line = win->_line + y;

    CHANGED_CELL(line, x);

    /*
     * Build up multibyte characters until we have a wide-character.
     */
    if_WIDEC({
	if (WINDOW_EXT(win, addch_used) != 0 || !Charable(ch)) {
	    int len = _nc_build_wch(win, CHREF(ch));

	    if (len >= -1) {
		/* handle EILSEQ */
		if (is8bits(CharOf(ch))) {
		    const char *s = unctrl((chtype) CharOf(ch));
		    if (s[1] != 0) {
			return waddstr(win, s);
		    }
		}
		if (len == -1)
		    return waddch(win, ' ');
	    } else {
		return OK;
	    }
	}
    });

    /*
     * Non-spacing characters are added to the current cell.
     *
     * Spacing characters that are wider than one column require some display
     * adjustments.
     */
    if_WIDEC({
	int len = wcwidth(CharOf(ch));
	int i;
	int j;
	wchar_t *chars;

	if (len == 0) {		/* non-spacing */
	    if ((x > 0 && y >= 0)
		|| (win->_maxx >= 0 && win->_cury >= 1)) {
		if (x > 0 && y >= 0)
		    chars = (win->_line[y].text[x - 1].chars);
		else
		    chars = (win->_line[y - 1].text[win->_maxx].chars);
		for (i = 0; i < CCHARW_MAX; ++i) {
		    if (chars[i] == 0) {
			TR(TRACE_VIRTPUT,
			   ("added non-spacing %d: %x",
			    x, (int) CharOf(ch)));
			chars[i] = CharOf(ch);
			break;
		    }
		}
	    }
	    goto testwrapping;
	} else if (len > 1) {	/* multi-column characters */
	    /*
	     * Check if the character will fit on the current line.  If it does
	     * not fit, fill in the remainder of the line with blanks.  and
	     * move to the next line.
	     */
	    if (len > win->_maxx + 1) {
		TR(TRACE_VIRTPUT, ("character will not fit"));
		return ERR;
	    } else if (x + len > win->_maxx + 1) {
		int count = win->_maxx + 1 - x;
		TR(TRACE_VIRTPUT, ("fill %d remaining cells", count));
		fill_cells(win, count);
		if (wrap_to_next_line(win) == ERR)
		    return ERR;
		x = win->_curx;
		y = win->_cury;
	    }
	    /*
	     * Check for cells which are orphaned by adding this character, set
	     * those to blanks.
	     *
	     * FIXME: this actually could fill j-i cells, more complicated to
	     * setup though.
	     */
	    for (i = 0; i < len; ++i) {
		if (isWidecBase(win->_line[y].text[x + i])) {
		    break;
		} else if (isWidecExt(win->_line[y].text[x + i])) {
		    for (j = i; x + j <= win->_maxx; ++j) {
			if (!isWidecExt(win->_line[y].text[x + j])) {
			    TR(TRACE_VIRTPUT, ("fill %d orphan cells", j));
			    fill_cells(win, j);
			    break;
			}
		    }
		    break;
		}
	    }
	    /*
	     * Finally, add the cells for this character.
	     */
	    for (i = 0; i < len; ++i) {
		NCURSES_CH_T value = ch;
		SetWidecExt(value, i);
		TR(TRACE_VIRTPUT, ("multicolumn %d:%d (%d,%d)",
				   i + 1, len,
				   win->_begy + y, win->_begx + x));
		line->text[x] = value;
		CHANGED_CELL(line, x);
		++x;
	    }
	    goto testwrapping;
	}
    });

    /*
     * Single-column characters.
     */
    line->text[x++] = ch;
    /*
     * This label is used only for wide-characters.
     */
    if_WIDEC(
  testwrapping:
    );

    TR(TRACE_VIRTPUT, ("cell (%ld, %ld..%d) = %s",
		       (long) win->_cury, (long) win->_curx, x - 1,
		       _tracech_t(CHREF(ch))));

    if (x > win->_maxx) {
	return wrap_to_next_line(win);
    }
    win->_curx = x;
    return OK;
}

static NCURSES_INLINE int
waddch_nosync(WINDOW *win, const NCURSES_CH_T ch)
/* the workhorse function -- add a character to the given window */
{
    NCURSES_SIZE_T x, y;
    chtype t = CharOf(ch);
    const char *s = unctrl(t);

    /*
     * If we are using the alternate character set, forget about locale.
     * Otherwise, if unctrl() returns a single-character or the locale
     * claims the code is printable, treat it that way.
     */
    if ((AttrOf(ch) & A_ALTCHARSET)
	|| (
#if USE_WIDEC_SUPPORT
	       (SP != 0 && SP->_legacy_coding) &&
#endif
	       s[1] == 0
	)
	|| (
	       isprint(t)
#if USE_WIDEC_SUPPORT
	       || ((SP == 0 || !SP->_legacy_coding) &&
		   (WINDOW_EXT(win, addch_used)
		    || !_nc_is_charable(CharOf(ch))))
#endif
	))
	return waddch_literal(win, ch);

    /*
     * Handle carriage control and other codes that are not printable, or are
     * known to expand to more than one character according to unctrl().
     */
    x = win->_curx;
    y = win->_cury;

    switch (t) {
    case '\t':
	x += (TABSIZE - (x % TABSIZE));

	/*
	 * Space-fill the tab on the bottom line so that we'll get the
	 * "correct" cursor position.
	 */
	if ((!win->_scroll && (y == win->_regbottom))
	    || (x <= win->_maxx)) {
	    NCURSES_CH_T blank = blankchar;
	    AddAttr(blank, AttrOf(ch));
	    while (win->_curx < x) {
		if (waddch_literal(win, blank) == ERR)
		    return (ERR);
	    }
	    break;
	} else {
	    wclrtoeol(win);
	    win->_flags |= _WRAPPED;
	    if (newline_forces_scroll(win, &y)) {
		x = win->_maxx;
		if (win->_scroll) {
		    scroll(win);
		    x = 0;
		}
	    } else {
		x = 0;
	    }
	}
	break;
    case '\n':
	wclrtoeol(win);
	if (newline_forces_scroll(win, &y)) {
	    if (win->_scroll)
		scroll(win);
	    else
		return (ERR);
	}
	/* FALLTHRU */
    case '\r':
	x = 0;
	win->_flags &= ~_WRAPPED;
	break;
    case '\b':
	if (x == 0)
	    return (OK);
	x--;
	win->_flags &= ~_WRAPPED;
	break;
    default:
	while (*s) {
	    NCURSES_CH_T sch;
	    SetChar(sch, *s++, AttrOf(ch));
	    if_EXT_COLORS(SetPair(sch, GetPair(ch)));
	    if (waddch_literal(win, sch) == ERR)
		return ERR;
	}
	return (OK);
    }

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

    return (OK);
}

NCURSES_EXPORT(int)
_nc_waddch_nosync(WINDOW *win, const NCURSES_CH_T c)
/* export copy of waddch_nosync() so the string-put functions can use it */
{
    return (waddch_nosync(win, c));
}

/*
 * The versions below call _nc_synchook().  We wanted to avoid this in the
 * version exported for string puts; they'll call _nc_synchook once at end
 * of run.
 */

/* These are actual entry points */

NCURSES_EXPORT(int)
waddch(WINDOW *win, const chtype ch)
{
    int code = ERR;
    NCURSES_CH_T wch;
    SetChar2(wch, ch);

    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("waddch(%p, %s)"), win,
				      _tracechtype(ch)));

    if (win && (waddch_nosync(win, wch) != ERR)) {
	_nc_synchook(win);
	code = OK;
    }

    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
    return (code);
}

NCURSES_EXPORT(int)
wechochar(WINDOW *win, const chtype ch)
{
    int code = ERR;
    NCURSES_CH_T wch;
    SetChar2(wch, ch);

    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("wechochar(%p, %s)"), win,
				      _tracechtype(ch)));

    if (win && (waddch_nosync(win, wch) != ERR)) {
	bool save_immed = win->_immed;
	win->_immed = TRUE;
	_nc_synchook(win);
	win->_immed = save_immed;
	code = OK;
    }
    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
    return (code);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: lib_addch.c,v 1.5 2010/01/12 23:22:05 nicm Exp $ */
2
3			/****************************************************************************
4			* Copyright (c) 1998-2006,2008 Free Software Foundation, Inc. *
5			* *
6			* Permission is hereby granted, free of charge, to any person obtaining a *
7			* copy of this software and associated documentation files (the *
8			* "Software"), to deal in the Software without restriction, including *
9			* without limitation the rights to use, copy, modify, merge, publish, *
10			* distribute, distribute with modifications, sublicense, and/or sell *
11			* copies of the Software, and to permit persons to whom the Software is *
12			* furnished to do so, subject to the following conditions: *
13			* *
14			* The above copyright notice and this permission notice shall be included *
15			* in all copies or substantial portions of the Software. *
16			* *
17			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
18			* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
19			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
20			* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
21			* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
22			* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
23			* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
24			* *
25			* Except as contained in this notice, the name(s) of the above copyright *
26			* holders shall not be used in advertising or otherwise to promote the *
27			* sale, use or other dealings in this Software without prior written *
28			* authorization. *
29			****************************************************************************/
30
31			/*
32			** lib_addch.c
33			**
34			** The routine waddch().
35			**
36			*/
37
38			#include <curses.priv.h>
39			#include <ctype.h>
40
41			MODULE_ID("$Id: lib_addch.c,v 1.5 2010/01/12 23:22:05 nicm Exp $")
42
43			static const NCURSES_CH_T blankchar = NewChar(BLANK_TEXT);
44
45			/*
46			* Ugly microtweaking alert. Everything from here to end of module is
47			* likely to be speed-critical -- profiling data sure says it is!
48			* Most of the important screen-painting functions are shells around
49			* waddch(). So we make every effort to reduce function-call overhead
50			* by inlining stuff, even at the cost of making wrapped copies for
51			* export. Also we supply some internal versions that don't call the
52			* window sync hook, for use by string-put functions.
53			*/
54
55			/* Return bit mask for clearing color pair number if given ch has color */
56			#define COLOR_MASK(ch) (~(attr_t)((ch) & A_COLOR ? A_COLOR : 0))
57
58			static NCURSES_INLINE NCURSES_CH_T
59			render_char(WINDOW *win, NCURSES_CH_T ch)
60			/* compute a rendition of the given char correct for the current context */
61			{
62			attr_t a = WINDOW_ATTRS(win);
63			int pair = GetPair(ch);
64
65			if (ISBLANK(ch)
66			&& AttrOf(ch) == A_NORMAL
67			&& pair == 0) {
68			/* color/pair in attrs has precedence over bkgrnd */
69			ch = win->_nc_bkgd;
70			SetAttr(ch, a \| AttrOf(win->_nc_bkgd));
71			if ((pair = GET_WINDOW_PAIR(win)) == 0)
72			pair = GetPair(win->_nc_bkgd);
73			SetPair(ch, pair);
74			} else {
75			/* color in attrs has precedence over bkgrnd */
76			a \|= AttrOf(win->_nc_bkgd) & COLOR_MASK(a);
77			/* color in ch has precedence */
78			if (pair == 0) {
79			if ((pair = GET_WINDOW_PAIR(win)) == 0)
80			pair = GetPair(win->_nc_bkgd);
81			}
82			#if 0
83			if (pair > 255) {
84			NCURSES_CH_T fixme = ch;
85			SetPair(fixme, pair);
86			}
87			#endif
88			AddAttr(ch, (a & COLOR_MASK(AttrOf(ch))));
89			SetPair(ch, pair);
90			}
91
92			TR(TRACE_VIRTPUT,
93			("render_char bkg %s (%d), attrs %s (%d) -> ch %s (%d)",
94			_tracech_t2(1, CHREF(win->_nc_bkgd)),
95			GetPair(win->_nc_bkgd),
96			_traceattr(WINDOW_ATTRS(win)),
97			GET_WINDOW_PAIR(win),
98			_tracech_t2(3, CHREF(ch)),
99			GetPair(ch)));
100
101			return (ch);
102			}
103
104			NCURSES_EXPORT(NCURSES_CH_T)
105			_nc_render(WINDOW *win, NCURSES_CH_T ch)
106			/* make render_char() visible while still allowing us to inline it below */
107			{
108			return render_char(win, ch);
109			}
110
111			/* check if position is legal; if not, return error */
112			#ifndef NDEBUG /* treat this like an assertion */
113			#define CHECK_POSITION(win, x, y) \
114			if (y > win->_maxy \
115			\|\| x > win->_maxx \
116			\|\| y < 0 \
117			\|\| x < 0) { \
118			TR(TRACE_VIRTPUT, ("Alert! Win=%p _curx = %d, _cury = %d " \
119			"(_maxx = %d, _maxy = %d)", win, x, y, \
120			win->_maxx, win->_maxy)); \
121			return(ERR); \
122			}
123			#else
124			#define CHECK_POSITION(win, x, y) /* nothing */
125			#endif
126
127			static bool
128			newline_forces_scroll(WINDOW win, NCURSES_SIZE_T ypos)
129			{
130			bool result = FALSE;
131
132			if (ypos >= win->_regtop && ypos == win->_regbottom) {
133			*ypos = win->_regbottom;
134			result = TRUE;
135			} else {
136			*ypos += 1;
137			}
138			return result;
139			}
140
141			/*
142			* The _WRAPPED flag is useful only for telling an application that we've just
143			* wrapped the cursor. We don't do anything with this flag except set it when
144			* wrapping, and clear it whenever we move the cursor. If we try to wrap at
145			* the lower-right corner of a window, we cannot move the cursor (since that
146			* wouldn't be legal). So we return an error (which is what SVr4 does).
147			* Unlike SVr4, we can successfully add a character to the lower-right corner
148			* (Solaris 2.6 does this also, however).
149			*/
150			static int
151			wrap_to_next_line(WINDOW *win)
152			{
153			win->_flags \|= _WRAPPED;
154			if (newline_forces_scroll(win, &(win->_cury))) {
155			win->_curx = win->_maxx;
156			if (!win->_scroll)
157			return (ERR);
158			scroll(win);
159			}
160			win->_curx = 0;
161			return (OK);
162			}
163
164			#if USE_WIDEC_SUPPORT
165			static int waddch_literal(WINDOW *, NCURSES_CH_T);
166			/*
167			* Fill the given number of cells with blanks using the current background
168			* rendition. This saves/restores the current x-position.
169			*/
170			static void
171			fill_cells(WINDOW *win, int count)
172			{
173			NCURSES_CH_T blank = blankchar;
174			int save_x = win->_curx;
175			int save_y = win->_cury;
176
177			while (count-- > 0) {
178			if (waddch_literal(win, blank) == ERR)
179			break;
180			}
181			win->_curx = save_x;
182			win->_cury = save_y;
183			}
184			#endif
185
186			/*
187			* Build up the bytes for a multibyte character, returning the length when
188			* complete (a positive number), -1 for error and -2 for incomplete.
189			*/
190			#if USE_WIDEC_SUPPORT
191			NCURSES_EXPORT(int)
192			_nc_build_wch(WINDOW *win, ARG_CH_T ch)
193			{
194			char *buffer = WINDOW_EXT(win, addch_work);
195			int len;
196			int x = win->_curx;
197			int y = win->_cury;
198			mbstate_t state;
199			wchar_t result;
200
201			if ((WINDOW_EXT(win, addch_used) != 0) &&
202			(WINDOW_EXT(win, addch_x) != x \|\|
203			WINDOW_EXT(win, addch_y) != y)) {
204			/* discard the incomplete multibyte character */
205			WINDOW_EXT(win, addch_used) = 0;
206			TR(TRACE_VIRTPUT,
207			("Alert discarded multibyte on move (%d,%d) -> (%d,%d)",
208			WINDOW_EXT(win, addch_y), WINDOW_EXT(win, addch_x),
209			y, x));
210			}
211			WINDOW_EXT(win, addch_x) = x;
212			WINDOW_EXT(win, addch_y) = y;
213
214			init_mb(state);
215			buffer[WINDOW_EXT(win, addch_used)] = (char) CharOf(CHDEREF(ch));
216			WINDOW_EXT(win, addch_used) += 1;
217			buffer[WINDOW_EXT(win, addch_used)] = '\0';
218			if ((len = mbrtowc(&result,
219			buffer,
220			WINDOW_EXT(win, addch_used), &state)) > 0) {
221			attr_t attrs = AttrOf(CHDEREF(ch));
222			if_EXT_COLORS(int pair = GetPair(CHDEREF(ch)));
223			SetChar(CHDEREF(ch), result, attrs);
224			if_EXT_COLORS(SetPair(CHDEREF(ch), pair));
225			WINDOW_EXT(win, addch_used) = 0;
226			} else if (len == -1) {
227			/*
228			* An error occurred. We could either discard everything,
229			* or assume that the error was in the previous input.
230			* Try the latter.
231			*/
232			TR(TRACE_VIRTPUT, ("Alert! mbrtowc returns error"));
233			/* handle this with unctrl() */
234			WINDOW_EXT(win, addch_used) = 0;
235			}
236			return len;
237			}
238			#endif /* USE_WIDEC_SUPPORT */
239
240			static
241			#if !USE_WIDEC_SUPPORT /* cannot be inline if it is recursive */
242			NCURSES_INLINE
243			#endif
244			int
245			waddch_literal(WINDOW *win, NCURSES_CH_T ch)
246			{
247			int x;
248			int y;
249			struct ldat *line;
250
251			x = win->_curx;
252			y = win->_cury;
253
254			CHECK_POSITION(win, x, y);
255
256			ch = render_char(win, ch);
257
258			line = win->_line + y;
259
260			CHANGED_CELL(line, x);
261
262			/*
263			* Build up multibyte characters until we have a wide-character.
264			*/
265			if_WIDEC({
266			if (WINDOW_EXT(win, addch_used) != 0 \|\| !Charable(ch)) {
267			int len = _nc_build_wch(win, CHREF(ch));
268
269			if (len >= -1) {
270			/* handle EILSEQ */
271			if (is8bits(CharOf(ch))) {
272			const char *s = unctrl((chtype) CharOf(ch));
273			if (s[1] != 0) {
274			return waddstr(win, s);
275			}
276			}
277			if (len == -1)
278			return waddch(win, ' ');
279			} else {
280			return OK;
281			}
282			}
283			});
284
285			/*
286			* Non-spacing characters are added to the current cell.
287			*
288			* Spacing characters that are wider than one column require some display
289			* adjustments.
290			*/
291			if_WIDEC({
292			int len = wcwidth(CharOf(ch));
293			int i;
294			int j;
295			wchar_t *chars;
296
297			if (len == 0) { /* non-spacing */
298			if ((x > 0 && y >= 0)
299			\|\| (win->_maxx >= 0 && win->_cury >= 1)) {
300			if (x > 0 && y >= 0)
301			chars = (win->_line[y].text[x - 1].chars);
302			else
303			chars = (win->_line[y - 1].text[win->_maxx].chars);
304			for (i = 0; i < CCHARW_MAX; ++i) {
305			if (chars[i] == 0) {
306			TR(TRACE_VIRTPUT,
307			("added non-spacing %d: %x",
308			x, (int) CharOf(ch)));
309			chars[i] = CharOf(ch);
310			break;
311			}
312			}
313			}
314			goto testwrapping;
315			} else if (len > 1) { /* multi-column characters */
316			/*
317			* Check if the character will fit on the current line. If it does
318			* not fit, fill in the remainder of the line with blanks. and
319			* move to the next line.
320			*/
321			if (len > win->_maxx + 1) {
322			TR(TRACE_VIRTPUT, ("character will not fit"));
323			return ERR;
324			} else if (x + len > win->_maxx + 1) {
325			int count = win->_maxx + 1 - x;
326			TR(TRACE_VIRTPUT, ("fill %d remaining cells", count));
327			fill_cells(win, count);
328			if (wrap_to_next_line(win) == ERR)
329			return ERR;
330			x = win->_curx;
331			y = win->_cury;
332			}
333			/*
334			* Check for cells which are orphaned by adding this character, set
335			* those to blanks.
336			*
337			* FIXME: this actually could fill j-i cells, more complicated to
338			* setup though.
339			*/
340			for (i = 0; i < len; ++i) {
341			if (isWidecBase(win->_line[y].text[x + i])) {
342			break;
343			} else if (isWidecExt(win->_line[y].text[x + i])) {
344			for (j = i; x + j <= win->_maxx; ++j) {
345			if (!isWidecExt(win->_line[y].text[x + j])) {
346			TR(TRACE_VIRTPUT, ("fill %d orphan cells", j));
347			fill_cells(win, j);
348			break;
349			}
350			}
351			break;
352			}
353			}
354			/*
355			* Finally, add the cells for this character.
356			*/
357			for (i = 0; i < len; ++i) {
358			NCURSES_CH_T value = ch;
359			SetWidecExt(value, i);
360			TR(TRACE_VIRTPUT, ("multicolumn %d:%d (%d,%d)",
361			i + 1, len,
362			win->_begy + y, win->_begx + x));
363			line->text[x] = value;
364			CHANGED_CELL(line, x);
365			++x;
366			}
367			goto testwrapping;
368			}
369			});
370
371			/*
372			* Single-column characters.
373			*/
374			line->text[x++] = ch;
375			/*
376			* This label is used only for wide-characters.
377			*/
378			if_WIDEC(
379			testwrapping:
380			);
381
382			TR(TRACE_VIRTPUT, ("cell (%ld, %ld..%d) = %s",
383			(long) win->_cury, (long) win->_curx, x - 1,
384			_tracech_t(CHREF(ch))));
385
386			if (x > win->_maxx) {
387			return wrap_to_next_line(win);
388			}
389			win->_curx = x;
390			return OK;
391			}
392
393			static NCURSES_INLINE int
394			waddch_nosync(WINDOW *win, const NCURSES_CH_T ch)
395			/* the workhorse function -- add a character to the given window */
396			{
397			NCURSES_SIZE_T x, y;
398			chtype t = CharOf(ch);
399			const char *s = unctrl(t);
400
401			/*
402			* If we are using the alternate character set, forget about locale.
403			* Otherwise, if unctrl() returns a single-character or the locale
404			* claims the code is printable, treat it that way.
405			*/
406			if ((AttrOf(ch) & A_ALTCHARSET)
407			\|\| (
408			#if USE_WIDEC_SUPPORT
409			(SP != 0 && SP->_legacy_coding) &&
410			#endif
411			s[1] == 0
412			)
413			\|\| (
414			isprint(t)
415			#if USE_WIDEC_SUPPORT
416			\|\| ((SP == 0 \|\| !SP->_legacy_coding) &&
417			(WINDOW_EXT(win, addch_used)
418			\|\| !_nc_is_charable(CharOf(ch))))
419			#endif
420			))
421			return waddch_literal(win, ch);
422
423			/*
424			* Handle carriage control and other codes that are not printable, or are
425			* known to expand to more than one character according to unctrl().
426			*/
427			x = win->_curx;
428			y = win->_cury;
429
430			switch (t) {
431			case '\t':
432			x += (TABSIZE - (x % TABSIZE));
433
434			/*
435			* Space-fill the tab on the bottom line so that we'll get the
436			* "correct" cursor position.
437			*/
438			if ((!win->_scroll && (y == win->_regbottom))
439			\|\| (x <= win->_maxx)) {
440			NCURSES_CH_T blank = blankchar;
441			AddAttr(blank, AttrOf(ch));
442			while (win->_curx < x) {
443			if (waddch_literal(win, blank) == ERR)
444			return (ERR);
445			}
446			break;
447			} else {
448			wclrtoeol(win);
449			win->_flags \|= _WRAPPED;
450			if (newline_forces_scroll(win, &y)) {
451			x = win->_maxx;
452			if (win->_scroll) {
453			scroll(win);
454			x = 0;
455			}
456			} else {
457			x = 0;
458			}
459			}
460			break;
461			case '\n':
462			wclrtoeol(win);
463			if (newline_forces_scroll(win, &y)) {
464			if (win->_scroll)
465			scroll(win);
466			else
467			return (ERR);
468			}
469			/* FALLTHRU */
470			case '\r':
471			x = 0;
472			win->_flags &= ~_WRAPPED;
473			break;
474			case '\b':
475			if (x == 0)
476			return (OK);
477			x--;
478			win->_flags &= ~_WRAPPED;
479			break;
480			default:
481			while (*s) {
482			NCURSES_CH_T sch;
483			SetChar(sch, *s++, AttrOf(ch));
484			if_EXT_COLORS(SetPair(sch, GetPair(ch)));
485			if (waddch_literal(win, sch) == ERR)
486			return ERR;
487			}
488			return (OK);
489			}
490
491			win->_curx = x;
492			win->_cury = y;
493
494			return (OK);
495			}
496
497			NCURSES_EXPORT(int)
498			_nc_waddch_nosync(WINDOW *win, const NCURSES_CH_T c)
499			/* export copy of waddch_nosync() so the string-put functions can use it */
500			{
501			return (waddch_nosync(win, c));
502			}
503
504			/*
505			* The versions below call _nc_synchook(). We wanted to avoid this in the
506			* version exported for string puts; they'll call _nc_synchook once at end
507			* of run.
508			*/
509
510			/* These are actual entry points */
511
512			NCURSES_EXPORT(int)
513			waddch(WINDOW *win, const chtype ch)
514			{
515			int code = ERR;
516			NCURSES_CH_T wch;
517			SetChar2(wch, ch);
518
519			TR(TRACE_VIRTPUT \| TRACE_CCALLS, (T_CALLED("waddch(%p, %s)"), win,
520			_tracechtype(ch)));
521
522			if (win && (waddch_nosync(win, wch) != ERR)) {
523			_nc_synchook(win);
524			code = OK;
525			}
526
527			TR(TRACE_VIRTPUT \| TRACE_CCALLS, (T_RETURN("%d"), code));
528			return (code);
529			}
530
531			NCURSES_EXPORT(int)
532			wechochar(WINDOW *win, const chtype ch)
533			{
534			int code = ERR;
535			NCURSES_CH_T wch;
536			SetChar2(wch, ch);
537
538			TR(TRACE_VIRTPUT \| TRACE_CCALLS, (T_CALLED("wechochar(%p, %s)"), win,
539			_tracechtype(ch)));
540
541			if (win && (waddch_nosync(win, wch) != ERR)) {
542			bool save_immed = win->_immed;
543			win->_immed = TRUE;
544			_nc_synchook(win);
545			win->_immed = save_immed;
546			code = OK;
547			}
548			TR(TRACE_VIRTPUT \| TRACE_CCALLS, (T_RETURN("%d"), code));
549			return (code);
550			}