lib_addch.c revision d036c70cacd0de6225b1da6ff34a218f4afe4962
1/****************************************************************************
2 * Copyright (c) 1998-2006,2008 Free Software Foundation, Inc.              *
3 *                                                                          *
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28
29/*
30**	lib_addch.c
31**
32**	The routine waddch().
33**
34*/
35
36#include <curses.priv.h>
37#include <ctype.h>
38
39MODULE_ID("$Id: lib_addch.c,v 1.111 2008/03/29 18:48:02 tom Exp $")
40
41static const NCURSES_CH_T blankchar = NewChar(BLANK_TEXT);
42
43/*
44 * Ugly microtweaking alert.  Everything from here to end of module is
45 * likely to be speed-critical -- profiling data sure says it is!
46 * Most of the important screen-painting functions are shells around
47 * waddch().  So we make every effort to reduce function-call overhead
48 * by inlining stuff, even at the cost of making wrapped copies for
49 * export.  Also we supply some internal versions that don't call the
50 * window sync hook, for use by string-put functions.
51 */
52
53/* Return bit mask for clearing color pair number if given ch has color */
54#define COLOR_MASK(ch) (~(attr_t)((ch) & A_COLOR ? A_COLOR : 0))
55
56static NCURSES_INLINE NCURSES_CH_T
57render_char(WINDOW *win, NCURSES_CH_T ch)
58/* compute a rendition of the given char correct for the current context */
59{
60    attr_t a = WINDOW_ATTRS(win);
61    int pair = GetPair(ch);
62
63    if (ISBLANK(ch)
64	&& AttrOf(ch) == A_NORMAL
65	&& pair == 0) {
66	/* color/pair in attrs has precedence over bkgrnd */
67	ch = win->_nc_bkgd;
68	SetAttr(ch, a | AttrOf(win->_nc_bkgd));
69	if ((pair = GET_WINDOW_PAIR(win)) == 0)
70	    pair = GetPair(win->_nc_bkgd);
71	SetPair(ch, pair);
72    } else {
73	/* color in attrs has precedence over bkgrnd */
74	a |= AttrOf(win->_nc_bkgd) & COLOR_MASK(a);
75	/* color in ch has precedence */
76	if (pair == 0) {
77	    if ((pair = GET_WINDOW_PAIR(win)) == 0)
78		pair = GetPair(win->_nc_bkgd);
79	}
80#if 0
81	if (pair > 255) {
82	    NCURSES_CH_T fixme = ch;
83	    SetPair(fixme, pair);
84	}
85#endif
86	AddAttr(ch, (a & COLOR_MASK(AttrOf(ch))));
87	SetPair(ch, pair);
88    }
89
90    TR(TRACE_VIRTPUT,
91       ("render_char bkg %s (%d), attrs %s (%d) -> ch %s (%d)",
92	_tracech_t2(1, CHREF(win->_nc_bkgd)),
93	GetPair(win->_nc_bkgd),
94	_traceattr(WINDOW_ATTRS(win)),
95	GET_WINDOW_PAIR(win),
96	_tracech_t2(3, CHREF(ch)),
97	GetPair(ch)));
98
99    return (ch);
100}
101
102NCURSES_EXPORT(NCURSES_CH_T)
103_nc_render(WINDOW *win, NCURSES_CH_T ch)
104/* make render_char() visible while still allowing us to inline it below */
105{
106    return render_char(win, ch);
107}
108
109/* check if position is legal; if not, return error */
110#ifndef NDEBUG			/* treat this like an assertion */
111#define CHECK_POSITION(win, x, y) \
112	if (y > win->_maxy \
113	 || x > win->_maxx \
114	 || y < 0 \
115	 || x < 0) { \
116		TR(TRACE_VIRTPUT, ("Alert! Win=%p _curx = %d, _cury = %d " \
117				   "(_maxx = %d, _maxy = %d)", win, x, y, \
118				   win->_maxx, win->_maxy)); \
119		return(ERR); \
120	}
121#else
122#define CHECK_POSITION(win, x, y)	/* nothing */
123#endif
124
125static bool
126newline_forces_scroll(WINDOW *win, NCURSES_SIZE_T * ypos)
127{
128    bool result = FALSE;
129
130    if (*ypos >= win->_regtop && *ypos == win->_regbottom) {
131	*ypos = win->_regbottom;
132	result = TRUE;
133    } else {
134	*ypos += 1;
135    }
136    return result;
137}
138
139/*
140 * The _WRAPPED flag is useful only for telling an application that we've just
141 * wrapped the cursor.  We don't do anything with this flag except set it when
142 * wrapping, and clear it whenever we move the cursor.  If we try to wrap at
143 * the lower-right corner of a window, we cannot move the cursor (since that
144 * wouldn't be legal).  So we return an error (which is what SVr4 does).
145 * Unlike SVr4, we can successfully add a character to the lower-right corner
146 * (Solaris 2.6 does this also, however).
147 */
148static int
149wrap_to_next_line(WINDOW *win)
150{
151    win->_flags |= _WRAPPED;
152    if (newline_forces_scroll(win, &(win->_cury))) {
153	win->_curx = win->_maxx;
154	if (!win->_scroll)
155	    return (ERR);
156	scroll(win);
157    }
158    win->_curx = 0;
159    return (OK);
160}
161
162#if USE_WIDEC_SUPPORT
163static int waddch_literal(WINDOW *, NCURSES_CH_T);
164/*
165 * Fill the given number of cells with blanks using the current background
166 * rendition.  This saves/restores the current x-position.
167 */
168static void
169fill_cells(WINDOW *win, int count)
170{
171    NCURSES_CH_T blank = blankchar;
172    int save_x = win->_curx;
173    int save_y = win->_cury;
174
175    while (count-- > 0) {
176	if (waddch_literal(win, blank) == ERR)
177	    break;
178    }
179    win->_curx = save_x;
180    win->_cury = save_y;
181}
182#endif
183
184/*
185 * Build up the bytes for a multibyte character, returning the length when
186 * complete (a positive number), -1 for error and -2 for incomplete.
187 */
188#if USE_WIDEC_SUPPORT
189NCURSES_EXPORT(int)
190_nc_build_wch(WINDOW *win, ARG_CH_T ch)
191{
192    char *buffer = WINDOW_EXT(win, addch_work);
193    int len;
194    int x = win->_curx;
195    int y = win->_cury;
196    mbstate_t state;
197    wchar_t result;
198
199    if ((WINDOW_EXT(win, addch_used) != 0) &&
200	(WINDOW_EXT(win, addch_x) != x ||
201	 WINDOW_EXT(win, addch_y) != y)) {
202	/* discard the incomplete multibyte character */
203	WINDOW_EXT(win, addch_used) = 0;
204	TR(TRACE_VIRTPUT,
205	   ("Alert discarded multibyte on move (%d,%d) -> (%d,%d)",
206	    WINDOW_EXT(win, addch_y), WINDOW_EXT(win, addch_x),
207	    y, x));
208    }
209    WINDOW_EXT(win, addch_x) = x;
210    WINDOW_EXT(win, addch_y) = y;
211
212    init_mb(state);
213    buffer[WINDOW_EXT(win, addch_used)] = CharOf(CHDEREF(ch));
214    WINDOW_EXT(win, addch_used) += 1;
215    buffer[WINDOW_EXT(win, addch_used)] = '\0';
216    if ((len = mbrtowc(&result,
217		       buffer,
218		       WINDOW_EXT(win, addch_used), &state)) > 0) {
219	attr_t attrs = AttrOf(CHDEREF(ch));
220	if_EXT_COLORS(int pair = GetPair(CHDEREF(ch)));
221	SetChar(CHDEREF(ch), result, attrs);
222	if_EXT_COLORS(SetPair(CHDEREF(ch), pair));
223	WINDOW_EXT(win, addch_used) = 0;
224    } else if (len == -1) {
225	/*
226	 * An error occurred.  We could either discard everything,
227	 * or assume that the error was in the previous input.
228	 * Try the latter.
229	 */
230	TR(TRACE_VIRTPUT, ("Alert! mbrtowc returns error"));
231	/* handle this with unctrl() */
232	WINDOW_EXT(win, addch_used) = 0;
233    }
234    return len;
235}
236#endif /* USE_WIDEC_SUPPORT */
237
238static
239#if !USE_WIDEC_SUPPORT		/* cannot be inline if it is recursive */
240NCURSES_INLINE
241#endif
242int
243waddch_literal(WINDOW *win, NCURSES_CH_T ch)
244{
245    int x;
246    int y;
247    struct ldat *line;
248
249    x = win->_curx;
250    y = win->_cury;
251
252    CHECK_POSITION(win, x, y);
253
254    ch = render_char(win, ch);
255
256    line = win->_line + y;
257
258    CHANGED_CELL(line, x);
259
260    /*
261     * Build up multibyte characters until we have a wide-character.
262     */
263    if_WIDEC({
264	if (WINDOW_EXT(win, addch_used) != 0 || !Charable(ch)) {
265	    int len = _nc_build_wch(win, CHREF(ch));
266
267	    if (len >= -1) {
268		/* handle EILSEQ */
269		if (is8bits(CharOf(ch))) {
270		    const char *s = unctrl((chtype) CharOf(ch));
271		    if (s[1] != 0) {
272			return waddstr(win, s);
273		    }
274		}
275		if (len == -1)
276		    return waddch(win, ' ');
277	    } else {
278		return OK;
279	    }
280	}
281    });
282
283    /*
284     * Non-spacing characters are added to the current cell.
285     *
286     * Spacing characters that are wider than one column require some display
287     * adjustments.
288     */
289    if_WIDEC({
290	int len = wcwidth(CharOf(ch));
291	int i;
292	int j;
293
294	if (len == 0) {		/* non-spacing */
295	    if ((x > 0 && y >= 0)
296		|| ((y = win->_cury - 1) >= 0 &&
297		    (x = win->_maxx) > 0)) {
298		wchar_t *chars = (win->_line[y].text[x - 1].chars);
299		for (i = 0; i < CCHARW_MAX; ++i) {
300		    if (chars[i] == 0) {
301			TR(TRACE_VIRTPUT,
302			   ("added non-spacing %d: %x",
303			    x, (int) CharOf(ch)));
304			chars[i] = CharOf(ch);
305			break;
306		    }
307		}
308	    }
309	    goto testwrapping;
310	} else if (len > 1) {	/* multi-column characters */
311	    /*
312	     * Check if the character will fit on the current line.  If it does
313	     * not fit, fill in the remainder of the line with blanks.  and
314	     * move to the next line.
315	     */
316	    if (len > win->_maxx + 1) {
317		TR(TRACE_VIRTPUT, ("character will not fit"));
318		return ERR;
319	    } else if (x + len > win->_maxx + 1) {
320		int count = win->_maxx + 1 - x;
321		TR(TRACE_VIRTPUT, ("fill %d remaining cells", count));
322		fill_cells(win, count);
323		if (wrap_to_next_line(win) == ERR)
324		    return ERR;
325		x = win->_curx;
326		y = win->_cury;
327	    }
328	    /*
329	     * Check for cells which are orphaned by adding this character, set
330	     * those to blanks.
331	     *
332	     * FIXME: this actually could fill j-i cells, more complicated to
333	     * setup though.
334	     */
335	    for (i = 0; i < len; ++i) {
336		if (isWidecBase(win->_line[y].text[x + i])) {
337		    break;
338		} else if (isWidecExt(win->_line[y].text[x + i])) {
339		    for (j = i; x + j <= win->_maxx; ++j) {
340			if (!isWidecExt(win->_line[y].text[x + j])) {
341			    TR(TRACE_VIRTPUT, ("fill %d orphan cells", j));
342			    fill_cells(win, j);
343			    break;
344			}
345		    }
346		    break;
347		}
348	    }
349	    /*
350	     * Finally, add the cells for this character.
351	     */
352	    for (i = 0; i < len; ++i) {
353		NCURSES_CH_T value = ch;
354		SetWidecExt(value, i);
355		TR(TRACE_VIRTPUT, ("multicolumn %d:%d (%d,%d)",
356				   i + 1, len,
357				   win->_begy + y, win->_begx + x));
358		line->text[x] = value;
359		CHANGED_CELL(line, x);
360		++x;
361	    }
362	    goto testwrapping;
363	}
364    });
365
366    /*
367     * Single-column characters.
368     */
369    line->text[x++] = ch;
370    /*
371     * This label is used only for wide-characters.
372     */
373    if_WIDEC(
374  testwrapping:
375    );
376
377    TR(TRACE_VIRTPUT, ("cell (%ld, %ld..%d) = %s",
378		       (long) win->_cury, (long) win->_curx, x - 1,
379		       _tracech_t(CHREF(ch))));
380
381    if (x > win->_maxx) {
382	return wrap_to_next_line(win);
383    }
384    win->_curx = x;
385    return OK;
386}
387
388static NCURSES_INLINE int
389waddch_nosync(WINDOW *win, const NCURSES_CH_T ch)
390/* the workhorse function -- add a character to the given window */
391{
392    NCURSES_SIZE_T x, y;
393    chtype t = CharOf(ch);
394    const char *s = unctrl(t);
395
396    /*
397     * If we are using the alternate character set, forget about locale.
398     * Otherwise, if unctrl() returns a single-character or the locale
399     * claims the code is printable, treat it that way.
400     */
401    if ((AttrOf(ch) & A_ALTCHARSET)
402	|| (
403#if USE_WIDEC_SUPPORT
404	       (SP != 0 && SP->_legacy_coding) &&
405#endif
406	       s[1] == 0
407	)
408	|| (
409	       isprint(t)
410#if USE_WIDEC_SUPPORT
411	       || ((SP == 0 || !SP->_legacy_coding) &&
412		   (WINDOW_EXT(win, addch_used)
413		    || !_nc_is_charable(CharOf(ch))))
414#endif
415	))
416	return waddch_literal(win, ch);
417
418    /*
419     * Handle carriage control and other codes that are not printable, or are
420     * known to expand to more than one character according to unctrl().
421     */
422    x = win->_curx;
423    y = win->_cury;
424
425    switch (t) {
426    case '\t':
427	x += (TABSIZE - (x % TABSIZE));
428
429	/*
430	 * Space-fill the tab on the bottom line so that we'll get the
431	 * "correct" cursor position.
432	 */
433	if ((!win->_scroll && (y == win->_regbottom))
434	    || (x <= win->_maxx)) {
435	    NCURSES_CH_T blank = blankchar;
436	    AddAttr(blank, AttrOf(ch));
437	    while (win->_curx < x) {
438		if (waddch_literal(win, blank) == ERR)
439		    return (ERR);
440	    }
441	    break;
442	} else {
443	    wclrtoeol(win);
444	    win->_flags |= _WRAPPED;
445	    if (newline_forces_scroll(win, &y)) {
446		x = win->_maxx;
447		if (win->_scroll) {
448		    scroll(win);
449		    x = 0;
450		}
451	    } else {
452		x = 0;
453	    }
454	}
455	break;
456    case '\n':
457	wclrtoeol(win);
458	if (newline_forces_scroll(win, &y)) {
459	    if (win->_scroll)
460		scroll(win);
461	    else
462		return (ERR);
463	}
464	/* FALLTHRU */
465    case '\r':
466	x = 0;
467	win->_flags &= ~_WRAPPED;
468	break;
469    case '\b':
470	if (x == 0)
471	    return (OK);
472	x--;
473	win->_flags &= ~_WRAPPED;
474	break;
475    default:
476	while (*s) {
477	    NCURSES_CH_T sch;
478	    SetChar(sch, *s++, AttrOf(ch));
479	    if_EXT_COLORS(SetPair(sch, GetPair(ch)));
480	    if (waddch_literal(win, sch) == ERR)
481		return ERR;
482	}
483	return (OK);
484    }
485
486    win->_curx = x;
487    win->_cury = y;
488
489    return (OK);
490}
491
492NCURSES_EXPORT(int)
493_nc_waddch_nosync(WINDOW *win, const NCURSES_CH_T c)
494/* export copy of waddch_nosync() so the string-put functions can use it */
495{
496    return (waddch_nosync(win, c));
497}
498
499/*
500 * The versions below call _nc_synchook().  We wanted to avoid this in the
501 * version exported for string puts; they'll call _nc_synchook once at end
502 * of run.
503 */
504
505/* These are actual entry points */
506
507NCURSES_EXPORT(int)
508waddch(WINDOW *win, const chtype ch)
509{
510    int code = ERR;
511    NCURSES_CH_T wch;
512    SetChar2(wch, ch);
513
514    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("waddch(%p, %s)"), win,
515				      _tracechtype(ch)));
516
517    if (win && (waddch_nosync(win, wch) != ERR)) {
518	_nc_synchook(win);
519	code = OK;
520    }
521
522    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
523    return (code);
524}
525
526NCURSES_EXPORT(int)
527wechochar(WINDOW *win, const chtype ch)
528{
529    int code = ERR;
530    NCURSES_CH_T wch;
531    SetChar2(wch, ch);
532
533    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("wechochar(%p, %s)"), win,
534				      _tracechtype(ch)));
535
536    if (win && (waddch_nosync(win, wch) != ERR)) {
537	bool save_immed = win->_immed;
538	win->_immed = TRUE;
539	_nc_synchook(win);
540	win->_immed = save_immed;
541	code = OK;
542    }
543    TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
544    return (code);
545}
546