lib/libcurses/addbytes.c

   1 /*      $NetBSD: addbytes.c,v 1.38 2010/12/16 17:42:28 wiz Exp $        */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)addbytes.c  8.4 (Berkeley) 5/4/94";
  36 #else
  37 __RCSID("$NetBSD: addbytes.c,v 1.38 2010/12/16 17:42:28 wiz Exp $");
  38 #endif
  39 #endif                          /* not lint */
  40
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include "curses.h"
  44 #include "curses_private.h"
  45 #ifdef DEBUG
  46 #include <assert.h>
  47 #endif
  48
  49 #define SYNCH_IN        {y = win->cury; x = win->curx;}
  50 #define SYNCH_OUT       {win->cury = y; win->curx = x;}
  51 #define PSYNCH_IN       {*y = win->cury; *x = win->curx;}
  52 #define PSYNCH_OUT      {win->cury = *y; win->curx = *x;}
  53
  54 #ifndef _CURSES_USE_MACROS
  55
  56 /*
  57  * addbytes --
  58  *      Add the character to the current position in stdscr.
  59  */
  60 int
  61 addbytes(const char *bytes, int count)
  62 {
  63         return __waddbytes(stdscr, bytes, count, 0);
  64 }
  65
  66 /*
  67  * waddbytes --
  68  *      Add the character to the current position in the given window.
  69  */
  70 int
  71 waddbytes(WINDOW *win, const char *bytes, int count)
  72 {
  73         return __waddbytes(win, bytes, count, 0);
  74 }
  75
  76 /*
  77  * mvaddbytes --
  78  *      Add the characters to stdscr at the location given.
  79  */
  80 int
  81 mvaddbytes(int y, int x, const char *bytes, int count)
  82 {
  83         return mvwaddbytes(stdscr, y, x, bytes, count);
  84 }
  85
  86 /*
  87  * mvwaddbytes --
  88  *      Add the characters to the given window at the location given.
  89  */
  90 int
  91 mvwaddbytes(WINDOW *win, int y, int x, const char *bytes, int count)
  92 {
  93         if (wmove(win, y, x) == ERR)
  94                 return ERR;
  95
  96         return __waddbytes(win, bytes, count, 0);
  97 }
  98
  99 #endif
 100
 101 /*
 102  * waddbytes --
 103  *      Add the character to the current position in the given window.
 104  */
 105 int
 106 __waddbytes(WINDOW *win, const char *bytes, int count, attr_t attr)
 107 {
 108         int              x, y, err;
 109         __LINE          *lp;
 110 #ifdef HAVE_WCHAR
 111         int             n;
 112         cchar_t         cc;
 113         wchar_t         wc;
 114         mbstate_t       st;
 115 #else
 116         int             c;
 117 #endif
 118 #ifdef DEBUG
 119         int             i;
 120
 121         for (i = 0; i < win->maxy; i++) {
 122                 assert(win->alines[i]->sentinel == SENTINEL_VALUE);
 123         }
 124
 125         __CTRACE(__CTRACE_INPUT, "ADDBYTES: add %d bytes\n", count);
 126 #endif
 127
 128         err = OK;
 129         SYNCH_IN;
 130         lp = win->alines[y];
 131
 132 #ifdef HAVE_WCHAR
 133         (void)memset(&st, 0, sizeof(st));
 134 #endif
 135         while (count > 0) {
 136 #ifndef HAVE_WCHAR
 137                 c = *bytes++;
 138 #ifdef DEBUG
 139                 __CTRACE(__CTRACE_INPUT, "ADDBYTES('%c', %x) at (%d, %d)\n",
 140                     c, attr, y, x);
 141 #endif
 142                 err = _cursesi_addbyte(win, &lp, &y, &x, c, attr);
 143                 count--;
 144 #else
 145                 /*
 146                  * For wide-character support only, try and convert the
 147                  * given string into a wide character - we do this because
 148                  * this is how ncurses behaves (not that I think this is
 149                  * actually the correct thing to do but if we don't do it
 150                  * a lot of things that rely on this behaviour will break
 151                  * and we will be blamed).  If the conversion succeeds
 152                  * then we eat the n characters used to make the wide char
 153                  * from the string.
 154                  */
 155                 n = (int)mbrtowc(&wc, bytes, (size_t)count, &st);
 156                 if (n < 0) {
 157                         /* not a valid conversion just eat a char */
 158                         wc = *bytes;
 159                         n = 1;
 160                         (void)memset(&st, 0, sizeof(st));
 161                 } else if (wc == 0) {
 162                         break;
 163                 }
 164 #ifdef DEBUG
 165         __CTRACE(__CTRACE_INPUT,
 166                  "ADDBYTES WIDE(0x%x [%s], %x) at (%d, %d), ate %d bytes\n",
 167                  (unsigned) wc, unctrl((unsigned) wc), attr, y, x, n);
 168 #endif
 169                 cc.vals[0] = wc;
 170                 cc.elements = 1;
 171                 cc.attributes = attr;
 172                 err = _cursesi_addwchar(win, &lp, &y, &x, &cc);
 173                 bytes += n;
 174                 count -= n;
 175 #endif
 176         }
 177
 178         SYNCH_OUT;
 179
 180 #ifdef DEBUG
 181         for (i = 0; i < win->maxy; i++) {
 182                 assert(win->alines[i]->sentinel == SENTINEL_VALUE);
 183         }
 184 #endif
 185
 186         return (err);
 187 }
 188
 189 /*
 190  * _cursesi_addbyte -
 191  *      Internal function to add a byte and update the row and column
 192  * positions as appropriate.  This function is only used in the narrow
 193  * character version of curses.
 194  */
 195 int
 196 _cursesi_addbyte(WINDOW *win, __LINE **lp, int *y, int *x, int c,
 197                  attr_t attr)
 198 {
 199         static char      blanks[] = "        ";
 200         int              newx;
 201         attr_t           attributes;
 202
 203         switch (c) {
 204         case '\t':
 205                 PSYNCH_OUT;
 206                 if (waddbytes(win, blanks, 8 - (*x % 8)) == ERR)
 207                         return (ERR);
 208                 PSYNCH_IN;
 209                 break;
 210
 211         default:
 212 #ifdef DEBUG
 213                 __CTRACE(__CTRACE_INPUT, "ADDBYTES(%p, %d, %d)\n",
 214                          win, *y, *x);
 215 #endif
 216
 217                 if ((*lp)->flags & __ISPASTEOL) {
 218                   new_line:
 219                         *x = 0;
 220                         (*lp)->flags &= ~__ISPASTEOL;
 221                         if (*y == win->scr_b) {
 222 #ifdef DEBUG
 223                                 __CTRACE(__CTRACE_INPUT,
 224                                          "ADDBYTES - on bottom "
 225                                          "of scrolling region\n");
 226 #endif
 227                                 if (!(win->flags & __SCROLLOK))
 228                                         return ERR;
 229                                 PSYNCH_OUT;
 230                                 scroll(win);
 231                                 PSYNCH_IN;
 232                         } else {
 233                                 (*y)++;
 234                         }
 235                         *lp = win->alines[*y];
 236                         if (c == '\n')
 237                                 break;
 238                 }
 239
 240                 attributes = (win->wattr | attr) &
 241                         (__ATTRIBUTES & ~__COLOR);
 242                 if (attr & __COLOR)
 243                         attributes |= attr & __COLOR;
 244                 else if (win->wattr & __COLOR)
 245                         attributes |= win->wattr & __COLOR;
 246 #ifdef DEBUG
 247                 __CTRACE(__CTRACE_INPUT,
 248                          "ADDBYTES: 1: y = %d, x = %d, firstch = %d, "
 249                          "lastch = %d\n",
 250                          *y, *x, *win->alines[*y]->firstchp,
 251                          *win->alines[*y]->lastchp);
 252 #endif
 253                 /*
 254                  * Always update the change pointers.  Otherwise,
 255                  * we could end up not displaying 'blank' characters
 256                  * when overlapping windows are displayed.
 257                  */
 258                 newx = *x + win->ch_off;
 259                 (*lp)->flags |= __ISDIRTY;
 260                 /*
 261                  * firstchp/lastchp are shared between
 262                  * parent window and sub-window.
 263                  */
 264                 if (newx < *(*lp)->firstchp)
 265                         *(*lp)->firstchp = newx;
 266                 if (newx > *(*lp)->lastchp)
 267                         *(*lp)->lastchp = newx;
 268 #ifdef DEBUG
 269                 __CTRACE(__CTRACE_INPUT,
 270                          "ADDBYTES: change gives f/l: %d/%d [%d/%d]\n",
 271                          *(*lp)->firstchp, *(*lp)->lastchp,
 272                          *(*lp)->firstchp - win->ch_off,
 273                          *(*lp)->lastchp - win->ch_off);
 274 #endif
 275                 if (win->bch != ' ' && c == ' ')
 276                         (*lp)->line[*x].ch = win->bch;
 277                 else
 278                         (*lp)->line[*x].ch = c;
 279
 280                 if (attributes & __COLOR)
 281                         (*lp)->line[*x].attr =
 282                                 attributes | (win->battr & ~__COLOR);
 283                 else
 284                         (*lp)->line[*x].attr = attributes | win->battr;
 285
 286                 if (*x == win->maxx - 1)
 287                         (*lp)->flags |= __ISPASTEOL;
 288                 else
 289                         (*x)++;
 290 #ifdef DEBUG
 291                 __CTRACE(__CTRACE_INPUT,
 292                          "ADDBYTES: 2: y = %d, x = %d, firstch = %d, "
 293                          "lastch = %d\n",
 294                          *y, *x, *win->alines[*y]->firstchp,
 295                          *win->alines[*y]->lastchp);
 296 #endif
 297                 break;
 298         case '\n':
 299                 PSYNCH_OUT;
 300                 wclrtoeol(win);
 301                 PSYNCH_IN;
 302                 goto new_line;
 303         case '\r':
 304                 *x = 0;
 305                 break;
 306         case '\b':
 307                 if (--(*x) < 0)
 308                         *x = 0;
 309                 break;
 310         }
 311
 312         return (OK);
 313 }
 314
 315 /*
 316  * _cursesi_addwchar -
 317  *      Internal function to add a wide character and update the row
 318  * and column positions.
 319  */
 320 int
 321 _cursesi_addwchar(WINDOW *win, __LINE **lnp, int *y, int *x,
 322                   const cchar_t *wch)
 323 {
 324 #ifndef HAVE_WCHAR
 325         return (ERR);
 326 #else
 327         int sx = 0, ex = 0, cw = 0, i = 0, newx = 0;
 328         __LDATA *lp = &win->alines[*y]->line[*x], *tp = NULL;
 329         nschar_t *np = NULL;
 330         cchar_t cc;
 331         attr_t attributes;
 332
 333         /* special characters handling */
 334         switch (wch->vals[0]) {
 335         case L'\b':
 336                 if (--*x < 0)
 337                         *x = 0;
 338                 win->curx = *x;
 339                 return OK;
 340         case L'\r':
 341                 *x = 0;
 342                 return OK;
 343         case L'\n':
 344                 wclrtoeol(win);
 345                 PSYNCH_IN;
 346                 *x = 0;
 347                 (*lnp)->flags &= ~__ISPASTEOL;
 348                 if (*y == win->scr_b) {
 349                         if (!(win->flags & __SCROLLOK))
 350                                 return ERR;
 351                         PSYNCH_OUT;
 352                         scroll(win);
 353                         PSYNCH_IN;
 354                 } else {
 355                         (*y)++;
 356                 }
 357                 PSYNCH_OUT;
 358                 return OK;
 359         case L'\t':
 360                 cc.vals[0] = L' ';
 361                 cc.elements = 1;
 362                 cc.attributes = win->wattr;
 363                 for (i = 0; i < 8 - (*x % 8); i++) {
 364                         if (wadd_wch(win, &cc) == ERR)
 365                                 return ERR;
 366                 }
 367                 return OK;
 368         }
 369
 370         /* check for non-spacing character */
 371         if (!wcwidth(wch->vals[0])) {
 372 #ifdef DEBUG
 373                 __CTRACE(__CTRACE_INPUT,
 374                          "_cursesi_addwchar: char '%c' is non-spacing\n",
 375                          wch->vals[0]);
 376 #endif /* DEBUG */
 377                 cw = WCOL(*lp);
 378                 if (cw < 0) {
 379                         lp += cw;
 380                         *x += cw;
 381                 }
 382                 for (i = 0; i < wch->elements; i++) {
 383                         if (!(np = (nschar_t *) malloc(sizeof(nschar_t))))
 384                                 return ERR;;
 385                         np->ch = wch->vals[i];
 386                         np->next = lp->nsp;
 387                         lp->nsp = np;
 388                 }
 389                 (*lnp)->flags |= __ISDIRTY;
 390                 newx = *x + win->ch_off;
 391                 if (newx < *(*lnp)->firstchp)
 392                         *(*lnp)->firstchp = newx;
 393                 if (newx > *(*lnp)->lastchp)
 394                         *(*lnp)->lastchp = newx;
 395                 __touchline(win, *y, *x, *x);
 396                 return OK;
 397         }
 398         /* check for new line first */
 399         if ((*lnp)->flags & __ISPASTEOL) {
 400                 *x = 0;
 401                 (*lnp)->flags &= ~__ISPASTEOL;
 402                 if (*y == win->scr_b) {
 403                         if (!(win->flags & __SCROLLOK))
 404                                 return ERR;
 405                         PSYNCH_OUT;
 406                         scroll(win);
 407                         PSYNCH_IN;
 408                 } else {
 409                         (*y)++;
 410                 }
 411                 (*lnp) = win->alines[*y];
 412                 lp = &win->alines[*y]->line[*x];
 413         }
 414         /* clear out the current character */
 415         cw = WCOL(*lp);
 416         if (cw >= 0) {
 417                 sx = *x;
 418         } else {
 419                 for (sx = *x - 1; sx >= max(*x + cw, 0); sx--) {
 420 #ifdef DEBUG
 421                         __CTRACE(__CTRACE_INPUT,
 422                                  "_cursesi_addwchar: clear current char (%d,%d)\n",
 423                                  *y, sx);
 424 #endif /* DEBUG */
 425                         tp = &win->alines[*y]->line[sx];
 426                         tp->ch = (wchar_t) btowc((int) win->bch);
 427                         if (_cursesi_copy_nsp(win->bnsp, tp) == ERR)
 428                                 return ERR;
 429
 430                         tp->attr = win->battr;
 431                         SET_WCOL(*tp, 1);
 432                 }
 433                 sx = *x + cw;
 434                 (*lnp)->flags |= __ISDIRTY;
 435                 newx = sx + win->ch_off;
 436                 if (newx < *(*lnp)->firstchp)
 437                         *(*lnp)->firstchp = newx;
 438         }
 439
 440         /* check for enough space before the end of line */
 441         cw = wcwidth(wch->vals[0]);
 442         if (cw < 0)
 443                 cw = 1;
 444         if (cw > win->maxx - *x) {
 445 #ifdef DEBUG
 446                 __CTRACE(__CTRACE_INPUT,
 447                          "_cursesi_addwchar: clear EOL (%d,%d)\n",
 448                          *y, *x);
 449 #endif /* DEBUG */
 450                 (*lnp)->flags |= __ISDIRTY;
 451                 newx = *x + win->ch_off;
 452                 if (newx < *(*lnp)->firstchp)
 453                         *(*lnp)->firstchp = newx;
 454                 for (tp = lp; *x < win->maxx; tp++, (*x)++) {
 455                         tp->ch = (wchar_t) btowc((int) win->bch);
 456                         if (_cursesi_copy_nsp(win->bnsp, tp) == ERR)
 457                                 return ERR;
 458                         tp->attr = win->battr;
 459                         SET_WCOL(*tp, 1);
 460                 }
 461                 newx = win->maxx - 1 + win->ch_off;
 462                 if (newx > *(*lnp)->lastchp)
 463                         *(*lnp)->lastchp = newx;
 464                 __touchline(win, *y, sx, (int) win->maxx - 1);
 465                 sx = *x = 0;
 466                 if (*y == win->scr_b) {
 467                         if (!(win->flags & __SCROLLOK))
 468                                 return ERR;
 469                         PSYNCH_OUT;
 470                         scroll(win);
 471                         PSYNCH_IN;
 472                 } else {
 473                         (*y)++;
 474                 }
 475                 lp = &win->alines[*y]->line[0];
 476                 (*lnp) = win->alines[*y];
 477         }
 478         win->cury = *y;
 479
 480         /* add spacing character */
 481 #ifdef DEBUG
 482         __CTRACE(__CTRACE_INPUT,
 483                  "_cursesi_addwchar: add character (%d,%d) 0x%x\n",
 484                  *y, *x, wch->vals[0]);
 485 #endif /* DEBUG */
 486         (*lnp)->flags |= __ISDIRTY;
 487         newx = *x + win->ch_off;
 488         if (newx < *(*lnp)->firstchp)
 489                 *(*lnp)->firstchp = newx;
 490         if (lp->nsp) {
 491                 __cursesi_free_nsp(lp->nsp);
 492                 lp->nsp = NULL;
 493         }
 494
 495         lp->ch = wch->vals[0];
 496
 497         attributes = (win->wattr | wch->attributes)
 498                 & (WA_ATTRIBUTES & ~__COLOR);
 499         if (wch->attributes & __COLOR)
 500                 attributes |= wch->attributes & __COLOR;
 501         else if (win->wattr & __COLOR)
 502                 attributes |= win->wattr & __COLOR;
 503         if (attributes & __COLOR)
 504                 lp->attr = attributes | (win->battr & ~__COLOR);
 505         else
 506                 lp->attr = attributes | win->battr;
 507
 508         SET_WCOL(*lp, cw);
 509
 510 #ifdef DEBUG
 511         __CTRACE(__CTRACE_INPUT,
 512                  "_cursesi_addwchar: add spacing char 0x%x, attr 0x%x\n",
 513                  lp->ch, lp->attr);
 514 #endif /* DEBUG */
 515
 516         if (wch->elements > 1) {
 517                 for (i = 1; i < wch->elements; i++) {
 518                         np = (nschar_t *)malloc(sizeof(nschar_t));
 519                         if (!np)
 520                                 return ERR;;
 521                         np->ch = wch->vals[i];
 522                         np->next = lp->nsp;
 523 #ifdef DEBUG
 524                         __CTRACE(__CTRACE_INPUT,
 525                             "_cursesi_addwchar: add non-spacing char 0x%x\n", np->ch);
 526 #endif /* DEBUG */
 527                         lp->nsp = np;
 528                 }
 529         }
 530 #ifdef DEBUG
 531         __CTRACE(__CTRACE_INPUT, "_cursesi_addwchar: non-spacing list header: %p\n",
 532             lp->nsp);
 533         __CTRACE(__CTRACE_INPUT, "_cursesi_addwchar: add rest columns (%d:%d)\n",
 534                 sx + 1, sx + cw - 1);
 535 #endif /* DEBUG */
 536         for (tp = lp + 1, *x = sx + 1; *x - sx <= cw - 1; tp++, (*x)++) {
 537                 if (tp->nsp) {
 538                         __cursesi_free_nsp(tp->nsp);
 539                         tp->nsp = NULL;
 540                 }
 541                 tp->ch = wch->vals[0];
 542                 tp->attr = lp->attr & WA_ATTRIBUTES;
 543                 /* Mark as "continuation" cell */
 544                 tp->attr |= __WCWIDTH;
 545         }
 546         if (*x == win->maxx) {
 547                 (*lnp)->flags |= __ISPASTEOL;
 548                 newx = win->maxx - 1 + win->ch_off;
 549                 if (newx > *(*lnp)->lastchp)
 550                         *(*lnp)->lastchp = newx;
 551                 __touchline(win, *y, sx, (int) win->maxx - 1);
 552                 win->curx = sx;
 553         } else {
 554                 win->curx = *x;
 555
 556                 /* clear the remining of the current characer */
 557                 if (*x && *x < win->maxx) {
 558                         ex = sx + cw;
 559                         tp = &win->alines[*y]->line[ex];
 560                         while (ex < win->maxx && WCOL(*tp) < 0) {
 561 #ifdef DEBUG
 562                                 __CTRACE(__CTRACE_INPUT,
 563                                          "_cursesi_addwchar: clear "
 564                                          "remaining of current char (%d,%d)nn",
 565                                          *y, ex);
 566 #endif /* DEBUG */
 567                                 tp->ch = (wchar_t) btowc((int) win->bch);
 568                                 if (_cursesi_copy_nsp(win->bnsp, tp) == ERR)
 569                                         return ERR;
 570                                 tp->attr = win->battr;
 571                                 SET_WCOL(*tp, 1);
 572                                 tp++, ex++;
 573                         }
 574                         newx = ex - 1 + win->ch_off;
 575                         if (newx > *(*lnp)->lastchp)
 576                                 *(*lnp)->lastchp = newx;
 577                         __touchline(win, *y, sx, ex - 1);
 578                 }
 579         }
 580
 581 #ifdef DEBUG
 582         __CTRACE(__CTRACE_INPUT, "add_wch: %d : 0x%x\n", lp->ch, lp->attr);
 583 #endif /* DEBUG */
 584         return OK;
 585 #endif
 586 }