release/src/router/libncurses/ncurses/widechar/lib_add_wch.c

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  28
  29 /*
  30 **      lib_add_wch.c
  31 **
  32 **      The routine wadd_wch().
  33 **
  34 */
  35
  36 #include <curses.priv.h>
  37
  38 #if HAVE_WCTYPE_H
  39 #include <wctype.h>
  40 #endif
  41
  42 MODULE_ID("$Id: lib_add_wch.c,v 1.12 2011/03/22 09:31:15 Petr.Pavlu Exp $")
  43
  44 /* clone/adapt lib_addch.c */
  45 static const cchar_t blankchar = NewChar(BLANK_TEXT);
  46
  47 /*
  48  * Ugly microtweaking alert.  Everything from here to end of module is
  49  * likely to be speed-critical -- profiling data sure says it is!
  50  * Most of the important screen-painting functions are shells around
  51  * wadd_wch().  So we make every effort to reduce function-call overhead
  52  * by inlining stuff, even at the cost of making wrapped copies for
  53  * export.  Also we supply some internal versions that don't call the
  54  * window sync hook, for use by string-put functions.
  55  */
  56
  57 /* Return bit mask for clearing color pair number if given ch has color */
  58 #define COLOR_MASK(ch) (~(attr_t)((ch) & A_COLOR ? A_COLOR : 0))
  59
  60 static NCURSES_INLINE cchar_t
  61 render_char(WINDOW *win, cchar_t ch)
  62 /* compute a rendition of the given char correct for the current context */
  63 {
  64     attr_t a = WINDOW_ATTRS(win);
  65     int pair = GetPair(ch);
  66
  67     if (ISBLANK(ch)
  68         && AttrOf(ch) == A_NORMAL
  69         && pair == 0) {
  70         /* color/pair in attrs has precedence over bkgrnd */
  71         ch = win->_nc_bkgd;
  72         SetAttr(ch, a | AttrOf(win->_nc_bkgd));
  73         if ((pair = GET_WINDOW_PAIR(win)) == 0)
  74             pair = GetPair(win->_nc_bkgd);
  75         SetPair(ch, pair);
  76     } else {
  77         /* color in attrs has precedence over bkgrnd */
  78         a |= AttrOf(win->_nc_bkgd) & COLOR_MASK(a);
  79         /* color in ch has precedence */
  80         if (pair == 0) {
  81             if ((pair = GET_WINDOW_PAIR(win)) == 0)
  82                 pair = GetPair(win->_nc_bkgd);
  83         }
  84         AddAttr(ch, (a & COLOR_MASK(AttrOf(ch))));
  85         SetPair(ch, pair);
  86     }
  87
  88     TR(TRACE_VIRTPUT,
  89        ("render_char bkg %s (%d), attrs %s (%d) -> ch %s (%d)",
  90         _tracech_t2(1, CHREF(win->_nc_bkgd)),
  91         GetPair(win->_nc_bkgd),
  92         _traceattr(WINDOW_ATTRS(win)),
  93         GET_WINDOW_PAIR(win),
  94         _tracech_t2(3, CHREF(ch)),
  95         GetPair(ch)));
  96
  97     return (ch);
  98 }
  99
 100 /* check if position is legal; if not, return error */
 101 #ifndef NDEBUG                  /* treat this like an assertion */
 102 #define CHECK_POSITION(win, x, y) \
 103         if (y > win->_maxy \
 104          || x > win->_maxx \
 105          || y < 0 \
 106          || x < 0) { \
 107                 TR(TRACE_VIRTPUT, ("Alert! Win=%p _curx = %d, _cury = %d " \
 108                                    "(_maxx = %d, _maxy = %d)", win, x, y, \
 109                                    win->_maxx, win->_maxy)); \
 110                 return(ERR); \
 111         }
 112 #else
 113 #define CHECK_POSITION(win, x, y)       /* nothing */
 114 #endif
 115
 116 static bool
 117 newline_forces_scroll(WINDOW *win, NCURSES_SIZE_T * ypos)
 118 {
 119     bool result = FALSE;
 120
 121     if (*ypos >= win->_regtop && *ypos == win->_regbottom) {
 122         *ypos = win->_regbottom;
 123         result = TRUE;
 124     } else {
 125         *ypos = (NCURSES_SIZE_T) (*ypos + 1);
 126     }
 127     return result;
 128 }
 129
 130 /*
 131  * The _WRAPPED flag is useful only for telling an application that we've just
 132  * wrapped the cursor.  We don't do anything with this flag except set it when
 133  * wrapping, and clear it whenever we move the cursor.  If we try to wrap at
 134  * the lower-right corner of a window, we cannot move the cursor (since that
 135  * wouldn't be legal).  So we return an error (which is what SVr4 does).
 136  * Unlike SVr4, we can successfully add a character to the lower-right corner
 137  * (Solaris 2.6 does this also, however).
 138  */
 139 static int
 140 wrap_to_next_line(WINDOW *win)
 141 {
 142     win->_flags |= _WRAPPED;
 143     if (newline_forces_scroll(win, &(win->_cury))) {
 144         win->_curx = win->_maxx;
 145         if (!win->_scroll)
 146             return (ERR);
 147         scroll(win);
 148     }
 149     win->_curx = 0;
 150     return (OK);
 151 }
 152
 153 static int wadd_wch_literal(WINDOW *, cchar_t);
 154 /*
 155  * Fill the given number of cells with blanks using the current background
 156  * rendition.  This saves/restores the current x-position.
 157  */
 158 static void
 159 fill_cells(WINDOW *win, int count)
 160 {
 161     cchar_t blank = blankchar;
 162     int save_x = win->_curx;
 163     int save_y = win->_cury;
 164
 165     while (count-- > 0) {
 166         if (wadd_wch_literal(win, blank) == ERR)
 167             break;
 168     }
 169     win->_curx = (NCURSES_SIZE_T) save_x;
 170     win->_cury = (NCURSES_SIZE_T) save_y;
 171 }
 172
 173 static int
 174 wadd_wch_literal(WINDOW *win, cchar_t ch)
 175 {
 176     int x;
 177     int y;
 178     struct ldat *line;
 179
 180     x = win->_curx;
 181     y = win->_cury;
 182
 183     CHECK_POSITION(win, x, y);
 184
 185     ch = render_char(win, ch);
 186
 187     line = win->_line + y;
 188
 189     CHANGED_CELL(line, x);
 190
 191     /*
 192      * Non-spacing characters are added to the current cell.
 193      *
 194      * Spacing characters that are wider than one column require some display
 195      * adjustments.
 196      */
 197     {
 198         int len = wcwidth(CharOf(ch));
 199         int i;
 200         int j;
 201         wchar_t *chars;
 202
 203         if (len == 0) {         /* non-spacing */
 204             if ((x > 0 && y >= 0)
 205                 || (win->_maxx >= 0 && win->_cury >= 1)) {
 206                 if (x > 0 && y >= 0)
 207                     chars = (win->_line[y].text[x - 1].chars);
 208                 else
 209                     chars = (win->_line[y - 1].text[win->_maxx].chars);
 210                 for (i = 0; i < CCHARW_MAX; ++i) {
 211                     if (chars[i] == 0) {
 212                         TR(TRACE_VIRTPUT,
 213                            ("added non-spacing %d: %x",
 214                             x, (int) CharOf(ch)));
 215                         chars[i] = CharOf(ch);
 216                         break;
 217                     }
 218                 }
 219             }
 220             goto testwrapping;
 221         } else if (len > 1) {   /* multi-column characters */
 222             /*
 223              * Check if the character will fit on the current line.  If it does
 224              * not fit, fill in the remainder of the line with blanks.  and
 225              * move to the next line.
 226              */
 227             if (len > win->_maxx + 1) {
 228                 TR(TRACE_VIRTPUT, ("character will not fit"));
 229                 return ERR;
 230             } else if (x + len > win->_maxx + 1) {
 231                 int count = win->_maxx + 1 - x;
 232                 TR(TRACE_VIRTPUT, ("fill %d remaining cells", count));
 233                 fill_cells(win, count);
 234                 if (wrap_to_next_line(win) == ERR)
 235                     return ERR;
 236                 x = win->_curx;
 237                 y = win->_cury;
 238                 line = win->_line + y;
 239             }
 240             /*
 241              * Check for cells which are orphaned by adding this character, set
 242              * those to blanks.
 243              *
 244              * FIXME: this actually could fill j-i cells, more complicated to
 245              * setup though.
 246              */
 247             for (i = 0; i < len; ++i) {
 248                 if (isWidecBase(win->_line[y].text[x + i])) {
 249                     break;
 250                 } else if (isWidecExt(win->_line[y].text[x + i])) {
 251                     for (j = i; x + j <= win->_maxx; ++j) {
 252                         if (!isWidecExt(win->_line[y].text[x + j])) {
 253                             TR(TRACE_VIRTPUT, ("fill %d orphan cells", j));
 254                             fill_cells(win, j);
 255                             break;
 256                         }
 257                     }
 258                     break;
 259                 }
 260             }
 261             /*
 262              * Finally, add the cells for this character.
 263              */
 264             for (i = 0; i < len; ++i) {
 265                 cchar_t value = ch;
 266                 SetWidecExt(value, i);
 267                 TR(TRACE_VIRTPUT, ("multicolumn %d:%d (%d,%d)",
 268                                    i + 1, len,
 269                                    win->_begy + y, win->_begx + x));
 270                 line->text[x] = value;
 271                 CHANGED_CELL(line, x);
 272                 ++x;
 273             }
 274             goto testwrapping;
 275         }
 276     }
 277
 278     /*
 279      * Single-column characters.
 280      */
 281     line->text[x++] = ch;
 282     /*
 283      * This label is used only for wide-characters.
 284      */
 285   testwrapping:
 286
 287     TR(TRACE_VIRTPUT, ("cell (%ld, %ld..%d) = %s",
 288                        (long) win->_cury, (long) win->_curx, x - 1,
 289                        _tracech_t(CHREF(ch))));
 290
 291     if (x > win->_maxx) {
 292         return wrap_to_next_line(win);
 293     }
 294     win->_curx = (NCURSES_SIZE_T) x;
 295     return OK;
 296 }
 297
 298 static NCURSES_INLINE int
 299 wadd_wch_nosync(WINDOW *win, cchar_t ch)
 300 /* the workhorse function -- add a character to the given window */
 301 {
 302     NCURSES_SIZE_T x, y;
 303     wchar_t *s;
 304     int tabsize = 8;
 305 #if USE_REENTRANT
 306     SCREEN *sp = _nc_screen_of(win);
 307 #endif
 308
 309     /*
 310      * If we are using the alternate character set, forget about locale.
 311      * Otherwise, if the locale claims the code is printable, treat it that
 312      * way.
 313      */
 314     if ((AttrOf(ch) & A_ALTCHARSET)
 315         || iswprint((wint_t) CharOf(ch)))
 316         return wadd_wch_literal(win, ch);
 317
 318     /*
 319      * Handle carriage control and other codes that are not printable, or are
 320      * known to expand to more than one character according to unctrl().
 321      */
 322     x = win->_curx;
 323     y = win->_cury;
 324
 325     switch (CharOf(ch)) {
 326     case '\t':
 327 #if USE_REENTRANT
 328         tabsize = *ptrTabsize(sp);
 329 #else
 330         tabsize = TABSIZE;
 331 #endif
 332         x = (NCURSES_SIZE_T) (x + (tabsize - (x % tabsize)));
 333         /*
 334          * Space-fill the tab on the bottom line so that we'll get the
 335          * "correct" cursor position.
 336          */
 337         if ((!win->_scroll && (y == win->_regbottom))
 338             || (x <= win->_maxx)) {
 339             cchar_t blank = blankchar;
 340             AddAttr(blank, AttrOf(ch));
 341             while (win->_curx < x) {
 342                 if (wadd_wch_literal(win, blank) == ERR)
 343                     return (ERR);
 344             }
 345             break;
 346         } else {
 347             wclrtoeol(win);
 348             win->_flags |= _WRAPPED;
 349             if (newline_forces_scroll(win, &y)) {
 350                 x = win->_maxx;
 351                 if (win->_scroll) {
 352                     scroll(win);
 353                     x = 0;
 354                 }
 355             } else {
 356                 x = 0;
 357             }
 358         }
 359         break;
 360     case '\n':
 361         wclrtoeol(win);
 362         if (newline_forces_scroll(win, &y)) {
 363             if (win->_scroll)
 364                 scroll(win);
 365             else
 366                 return (ERR);
 367         }
 368         /* FALLTHRU */
 369     case '\r':
 370         x = 0;
 371         win->_flags &= ~_WRAPPED;
 372         break;
 373     case '\b':
 374         if (x == 0)
 375             return (OK);
 376         x--;
 377         win->_flags &= ~_WRAPPED;
 378         break;
 379     default:
 380         if ((s = wunctrl(&ch)) != 0) {
 381             while (*s) {
 382                 cchar_t sch;
 383                 SetChar(sch, *s++, AttrOf(ch));
 384                 if_EXT_COLORS(SetPair(sch, GetPair(ch)));
 385                 if (wadd_wch_literal(win, sch) == ERR)
 386                     return ERR;
 387             }
 388             return OK;
 389         }
 390         return ERR;
 391     }
 392
 393     win->_curx = x;
 394     win->_cury = y;
 395
 396     return OK;
 397 }
 398
 399 /*
 400  * The versions below call _nc_synchook().  We wanted to avoid this in the
 401  * version exported for string puts; they'll call _nc_synchook once at end
 402  * of run.
 403  */
 404
 405 /* These are actual entry points */
 406
 407 NCURSES_EXPORT(int)
 408 wadd_wch(WINDOW *win, const cchar_t *wch)
 409 {
 410     int code = ERR;
 411
 412     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("wadd_wch(%p, %s)"),
 413                                       (void *) win,
 414                                       _tracecchar_t(wch)));
 415
 416     if (win && (wadd_wch_nosync(win, *wch) != ERR)) {
 417         _nc_synchook(win);
 418         code = OK;
 419     }
 420
 421     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
 422     return (code);
 423 }
 424
 425 NCURSES_EXPORT(int)
 426 wecho_wchar(WINDOW *win, const cchar_t *wch)
 427 {
 428     int code = ERR;
 429
 430     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("wechochar(%p, %s)"),
 431                                       (void *) win,
 432                                       _tracecchar_t(wch)));
 433
 434     if (win && (wadd_wch_nosync(win, *wch) != ERR)) {
 435         bool save_immed = win->_immed;
 436         win->_immed = TRUE;
 437         _nc_synchook(win);
 438         win->_immed = save_immed;
 439         code = OK;
 440     }
 441     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
 442     return (code);
 443 }