release/src/router/libncurses/ncurses/base/lib_addch.c

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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
  39 MODULE_ID("$Id: lib_addch.c,v 1.129 2014/08/16 20:41:04 tom Exp $")
  40
  41 static 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
  56 static NCURSES_INLINE NCURSES_CH_T
  57 render_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         AddAttr(ch, (a & COLOR_MASK(AttrOf(ch))));
  81         SetPair(ch, pair);
  82     }
  83
  84     TR(TRACE_VIRTPUT,
  85        ("render_char bkg %s (%d), attrs %s (%d) -> ch %s (%d)",
  86         _tracech_t2(1, CHREF(win->_nc_bkgd)),
  87         GetPair(win->_nc_bkgd),
  88         _traceattr(WINDOW_ATTRS(win)),
  89         GET_WINDOW_PAIR(win),
  90         _tracech_t2(3, CHREF(ch)),
  91         GetPair(ch)));
  92
  93     return (ch);
  94 }
  95
  96 NCURSES_EXPORT(NCURSES_CH_T)
  97 _nc_render(WINDOW *win, NCURSES_CH_T ch)
  98 /* make render_char() visible while still allowing us to inline it below */
  99 {
 100     return render_char(win, ch);
 101 }
 102
 103 /* check if position is legal; if not, return error */
 104 #ifndef NDEBUG                  /* treat this like an assertion */
 105 #define CHECK_POSITION(win, x, y) \
 106         if (y > win->_maxy \
 107          || x > win->_maxx \
 108          || y < 0 \
 109          || x < 0) { \
 110                 TR(TRACE_VIRTPUT, ("Alert! Win=%p _curx = %d, _cury = %d " \
 111                                    "(_maxx = %d, _maxy = %d)", win, x, y, \
 112                                    win->_maxx, win->_maxy)); \
 113                 return(ERR); \
 114         }
 115 #else
 116 #define CHECK_POSITION(win, x, y)       /* nothing */
 117 #endif
 118
 119 static bool
 120 newline_forces_scroll(WINDOW *win, NCURSES_SIZE_T * ypos)
 121 {
 122     bool result = FALSE;
 123
 124     if (*ypos >= win->_regtop && *ypos == win->_regbottom) {
 125         *ypos = win->_regbottom;
 126         result = TRUE;
 127     } else {
 128         *ypos = (NCURSES_SIZE_T) (*ypos + 1);
 129     }
 130     return result;
 131 }
 132
 133 /*
 134  * The _WRAPPED flag is useful only for telling an application that we've just
 135  * wrapped the cursor.  We don't do anything with this flag except set it when
 136  * wrapping, and clear it whenever we move the cursor.  If we try to wrap at
 137  * the lower-right corner of a window, we cannot move the cursor (since that
 138  * wouldn't be legal).  So we return an error (which is what SVr4 does).
 139  * Unlike SVr4, we can successfully add a character to the lower-right corner
 140  * (Solaris 2.6 does this also, however).
 141  */
 142 static int
 143 wrap_to_next_line(WINDOW *win)
 144 {
 145     win->_flags |= _WRAPPED;
 146     if (newline_forces_scroll(win, &(win->_cury))) {
 147         win->_curx = win->_maxx;
 148         if (!win->_scroll)
 149             return (ERR);
 150         scroll(win);
 151     }
 152     win->_curx = 0;
 153     return (OK);
 154 }
 155
 156 #if USE_WIDEC_SUPPORT
 157 static int waddch_literal(WINDOW *, NCURSES_CH_T);
 158 /*
 159  * Fill the given number of cells with blanks using the current background
 160  * rendition.  This saves/restores the current x-position.
 161  */
 162 static void
 163 fill_cells(WINDOW *win, int count)
 164 {
 165     NCURSES_CH_T blank = blankchar;
 166     int save_x = win->_curx;
 167     int save_y = win->_cury;
 168
 169     while (count-- > 0) {
 170         if (waddch_literal(win, blank) == ERR)
 171             break;
 172     }
 173     win->_curx = (NCURSES_SIZE_T) save_x;
 174     win->_cury = (NCURSES_SIZE_T) save_y;
 175 }
 176 #endif
 177
 178 /*
 179  * Build up the bytes for a multibyte character, returning the length when
 180  * complete (a positive number), -1 for error and -2 for incomplete.
 181  */
 182 #if USE_WIDEC_SUPPORT
 183 NCURSES_EXPORT(int)
 184 _nc_build_wch(WINDOW *win, ARG_CH_T ch)
 185 {
 186     char *buffer = WINDOW_EXT(win, addch_work);
 187     int len;
 188     int x = win->_curx;
 189     int y = win->_cury;
 190     mbstate_t state;
 191     wchar_t result;
 192
 193     if ((WINDOW_EXT(win, addch_used) != 0) &&
 194         (WINDOW_EXT(win, addch_x) != x ||
 195          WINDOW_EXT(win, addch_y) != y)) {
 196         /* discard the incomplete multibyte character */
 197         WINDOW_EXT(win, addch_used) = 0;
 198         TR(TRACE_VIRTPUT,
 199            ("Alert discarded multibyte on move (%d,%d) -> (%d,%d)",
 200             WINDOW_EXT(win, addch_y), WINDOW_EXT(win, addch_x),
 201             y, x));
 202     }
 203     WINDOW_EXT(win, addch_x) = x;
 204     WINDOW_EXT(win, addch_y) = y;
 205
 206     init_mb(state);
 207     buffer[WINDOW_EXT(win, addch_used)] = (char) CharOf(CHDEREF(ch));
 208     WINDOW_EXT(win, addch_used) += 1;
 209     buffer[WINDOW_EXT(win, addch_used)] = '\0';
 210     if ((len = (int) mbrtowc(&result,
 211                              buffer,
 212                              (size_t) WINDOW_EXT(win, addch_used),
 213                              &state)) > 0) {
 214         attr_t attrs = AttrOf(CHDEREF(ch));
 215         if_EXT_COLORS(int pair = GetPair(CHDEREF(ch)));
 216         SetChar(CHDEREF(ch), result, attrs);
 217         if_EXT_COLORS(SetPair(CHDEREF(ch), pair));
 218         WINDOW_EXT(win, addch_used) = 0;
 219     } else if (len == -1) {
 220         /*
 221          * An error occurred.  We could either discard everything,
 222          * or assume that the error was in the previous input.
 223          * Try the latter.
 224          */
 225         TR(TRACE_VIRTPUT, ("Alert! mbrtowc returns error"));
 226         /* handle this with unctrl() */
 227         WINDOW_EXT(win, addch_used) = 0;
 228     }
 229     return len;
 230 }
 231 #endif /* USE_WIDEC_SUPPORT */
 232
 233 static
 234 #if !USE_WIDEC_SUPPORT          /* cannot be inline if it is recursive */
 235 NCURSES_INLINE
 236 #endif
 237 int
 238 waddch_literal(WINDOW *win, NCURSES_CH_T ch)
 239 {
 240     int x;
 241     int y;
 242     struct ldat *line;
 243
 244     x = win->_curx;
 245     y = win->_cury;
 246
 247     CHECK_POSITION(win, x, y);
 248
 249     ch = render_char(win, ch);
 250
 251     line = win->_line + y;
 252
 253     CHANGED_CELL(line, x);
 254
 255     /*
 256      * Build up multibyte characters until we have a wide-character.
 257      */
 258 #if NCURSES_SP_FUNCS
 259 #define DeriveSP() SCREEN *sp = _nc_screen_of(win);
 260 #else
 261 #define DeriveSP()              /*nothing */
 262 #endif
 263     if_WIDEC({
 264         DeriveSP();
 265         if (WINDOW_EXT(win, addch_used) != 0 || !Charable(ch)) {
 266             int len = _nc_build_wch(win, CHREF(ch));
 267
 268             if (len >= -1) {
 269                 attr_t attr = AttrOf(ch);
 270
 271                 /* handle EILSEQ (i.e., when len >= -1) */
 272                 if (len == -1 && is8bits(CharOf(ch))) {
 273                     int rc = OK;
 274                     const char *s = NCURSES_SP_NAME(unctrl)
 275                       (NCURSES_SP_ARGx (chtype) CharOf(ch));
 276
 277                     if (s[1] != '\0') {
 278                         while (*s != '\0') {
 279                             rc = waddch(win, UChar(*s) | attr);
 280                             if (rc != OK)
 281                                 break;
 282                             ++s;
 283                         }
 284                         return rc;
 285                     }
 286                 }
 287                 if (len == -1)
 288                     return waddch(win, ' ' | attr);
 289             } else {
 290                 return OK;
 291             }
 292         }
 293     });
 294
 295     /*
 296      * Non-spacing characters are added to the current cell.
 297      *
 298      * Spacing characters that are wider than one column require some display
 299      * adjustments.
 300      */
 301     if_WIDEC({
 302         int len = wcwidth(CharOf(ch));
 303         int i;
 304         int j;
 305         wchar_t *chars;
 306
 307         if (len == 0) {         /* non-spacing */
 308             if ((x > 0 && y >= 0)
 309                 || (win->_maxx >= 0 && win->_cury >= 1)) {
 310                 if (x > 0 && y >= 0)
 311                     chars = (win->_line[y].text[x - 1].chars);
 312                 else
 313                     chars = (win->_line[y - 1].text[win->_maxx].chars);
 314                 for (i = 0; i < CCHARW_MAX; ++i) {
 315                     if (chars[i] == 0) {
 316                         TR(TRACE_VIRTPUT,
 317                            ("added non-spacing %d: %x",
 318                             x, (int) CharOf(ch)));
 319                         chars[i] = CharOf(ch);
 320                         break;
 321                     }
 322                 }
 323             }
 324             goto testwrapping;
 325         } else if (len > 1) {   /* multi-column characters */
 326             /*
 327              * Check if the character will fit on the current line.  If it does
 328              * not fit, fill in the remainder of the line with blanks.  and
 329              * move to the next line.
 330              */
 331             if (len > win->_maxx + 1) {
 332                 TR(TRACE_VIRTPUT, ("character will not fit"));
 333                 return ERR;
 334             } else if (x + len > win->_maxx + 1) {
 335                 int count = win->_maxx + 1 - x;
 336                 TR(TRACE_VIRTPUT, ("fill %d remaining cells", count));
 337                 fill_cells(win, count);
 338                 if (wrap_to_next_line(win) == ERR)
 339                     return ERR;
 340                 x = win->_curx;
 341                 y = win->_cury;
 342                 line = win->_line + y;
 343             }
 344             /*
 345              * Check for cells which are orphaned by adding this character, set
 346              * those to blanks.
 347              *
 348              * FIXME: this actually could fill j-i cells, more complicated to
 349              * setup though.
 350              */
 351             for (i = 0; i < len; ++i) {
 352                 if (isWidecBase(win->_line[y].text[x + i])) {
 353                     break;
 354                 } else if (isWidecExt(win->_line[y].text[x + i])) {
 355                     for (j = i; x + j <= win->_maxx; ++j) {
 356                         if (!isWidecExt(win->_line[y].text[x + j])) {
 357                             TR(TRACE_VIRTPUT, ("fill %d orphan cells", j));
 358                             fill_cells(win, j);
 359                             break;
 360                         }
 361                     }
 362                     break;
 363                 }
 364             }
 365             /*
 366              * Finally, add the cells for this character.
 367              */
 368             for (i = 0; i < len; ++i) {
 369                 NCURSES_CH_T value = ch;
 370                 SetWidecExt(value, i);
 371                 TR(TRACE_VIRTPUT, ("multicolumn %d:%d (%d,%d)",
 372                                    i + 1, len,
 373                                    win->_begy + y, win->_begx + x));
 374                 line->text[x] = value;
 375                 CHANGED_CELL(line, x);
 376                 ++x;
 377             }
 378             goto testwrapping;
 379         }
 380     });
 381
 382     /*
 383      * Single-column characters.
 384      */
 385     line->text[x++] = ch;
 386     /*
 387      * This label is used only for wide-characters.
 388      */
 389     if_WIDEC(
 390   testwrapping:
 391     );
 392
 393     TR(TRACE_VIRTPUT, ("cell (%ld, %ld..%d) = %s",
 394                        (long) win->_cury, (long) win->_curx, x - 1,
 395                        _tracech_t(CHREF(ch))));
 396
 397     if (x > win->_maxx) {
 398         return wrap_to_next_line(win);
 399     }
 400     win->_curx = (NCURSES_SIZE_T) x;
 401     return OK;
 402 }
 403
 404 static NCURSES_INLINE int
 405 waddch_nosync(WINDOW *win, const NCURSES_CH_T ch)
 406 /* the workhorse function -- add a character to the given window */
 407 {
 408     NCURSES_SIZE_T x, y;
 409     chtype t = (chtype) CharOf(ch);
 410 #if USE_WIDEC_SUPPORT || NCURSES_SP_FUNCS || USE_REENTRANT
 411     SCREEN *sp = _nc_screen_of(win);
 412 #endif
 413     const char *s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx t);
 414     int tabsize = 8;
 415
 416     /*
 417      * If we are using the alternate character set, forget about locale.
 418      * Otherwise, if unctrl() returns a single-character or the locale
 419      * claims the code is printable (and not also a control character),
 420      * treat it that way.
 421      */
 422     if ((AttrOf(ch) & A_ALTCHARSET)
 423         || (
 424 #if USE_WIDEC_SUPPORT
 425                (sp != 0 && sp->_legacy_coding) &&
 426 #endif
 427                s[1] == 0
 428         )
 429         || (
 430                (isprint((int)t) && !iscntrl((int)t))
 431 #if USE_WIDEC_SUPPORT
 432                || ((sp == 0 || !sp->_legacy_coding) &&
 433                    (WINDOW_EXT(win, addch_used)
 434                     || !_nc_is_charable(CharOf(ch))))
 435 #endif
 436         )) {
 437         return waddch_literal(win, ch);
 438     }
 439
 440     /*
 441      * Handle carriage control and other codes that are not printable, or are
 442      * known to expand to more than one character according to unctrl().
 443      */
 444     x = win->_curx;
 445     y = win->_cury;
 446
 447     switch (t) {
 448     case '\t':
 449 #if USE_REENTRANT
 450         tabsize = *ptrTabsize(sp);
 451 #else
 452         tabsize = TABSIZE;
 453 #endif
 454         x = (NCURSES_SIZE_T) (x + (tabsize - (x % tabsize)));
 455         /*
 456          * Space-fill the tab on the bottom line so that we'll get the
 457          * "correct" cursor position.
 458          */
 459         if ((!win->_scroll && (y == win->_regbottom))
 460             || (x <= win->_maxx)) {
 461             NCURSES_CH_T blank = blankchar;
 462             AddAttr(blank, AttrOf(ch));
 463             while (win->_curx < x) {
 464                 if (waddch_literal(win, blank) == ERR)
 465                     return (ERR);
 466             }
 467             break;
 468         } else {
 469             wclrtoeol(win);
 470             win->_flags |= _WRAPPED;
 471             if (newline_forces_scroll(win, &y)) {
 472                 x = win->_maxx;
 473                 if (win->_scroll) {
 474                     scroll(win);
 475                     x = 0;
 476                 }
 477             } else {
 478                 x = 0;
 479             }
 480         }
 481         break;
 482     case '\n':
 483         wclrtoeol(win);
 484         if (newline_forces_scroll(win, &y)) {
 485             if (win->_scroll)
 486                 scroll(win);
 487             else
 488                 return (ERR);
 489         }
 490         /* FALLTHRU */
 491     case '\r':
 492         x = 0;
 493         win->_flags &= ~_WRAPPED;
 494         break;
 495     case '\b':
 496         if (x == 0)
 497             return (OK);
 498         x--;
 499         win->_flags &= ~_WRAPPED;
 500         break;
 501     default:
 502         while (*s) {
 503             NCURSES_CH_T sch;
 504             SetChar(sch, UChar(*s++), AttrOf(ch));
 505             if_EXT_COLORS(SetPair(sch, GetPair(ch)));
 506             if (waddch_literal(win, sch) == ERR)
 507                 return ERR;
 508         }
 509         return (OK);
 510     }
 511
 512     win->_curx = x;
 513     win->_cury = y;
 514
 515     return (OK);
 516 }
 517
 518 NCURSES_EXPORT(int)
 519 _nc_waddch_nosync(WINDOW *win, const NCURSES_CH_T c)
 520 /* export copy of waddch_nosync() so the string-put functions can use it */
 521 {
 522     return (waddch_nosync(win, c));
 523 }
 524
 525 /*
 526  * The versions below call _nc_synchook().  We wanted to avoid this in the
 527  * version exported for string puts; they'll call _nc_synchook once at end
 528  * of run.
 529  */
 530
 531 /* These are actual entry points */
 532
 533 NCURSES_EXPORT(int)
 534 waddch(WINDOW *win, const chtype ch)
 535 {
 536     int code = ERR;
 537     NCURSES_CH_T wch;
 538     SetChar2(wch, ch);
 539
 540     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("waddch(%p, %s)"), (void *) win,
 541                                       _tracechtype(ch)));
 542
 543     if (win && (waddch_nosync(win, wch) != ERR)) {
 544         _nc_synchook(win);
 545         code = OK;
 546     }
 547
 548     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
 549     return (code);
 550 }
 551
 552 NCURSES_EXPORT(int)
 553 wechochar(WINDOW *win, const chtype ch)
 554 {
 555     int code = ERR;
 556     NCURSES_CH_T wch;
 557     SetChar2(wch, ch);
 558
 559     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_CALLED("wechochar(%p, %s)"),
 560                                       (void *) win,
 561                                       _tracechtype(ch)));
 562
 563     if (win && (waddch_nosync(win, wch) != ERR)) {
 564         bool save_immed = win->_immed;
 565         win->_immed = TRUE;
 566         _nc_synchook(win);
 567         win->_immed = save_immed;
 568         code = OK;
 569     }
 570     TR(TRACE_VIRTPUT | TRACE_CCALLS, (T_RETURN("%d"), code));
 571     return (code);
 572 }