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

   1 /****************************************************************************
   2  * Copyright (c) 1998-2011,2015 Free Software Foundation, Inc.              *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996 on                 *
  33  *     and: Juergen Pfeifer                         2009                    *
  34  ****************************************************************************/
  35
  36 #include <curses.priv.h>
  37
  38 #include <ctype.h>
  39
  40 #ifndef CUR
  41 #define CUR SP_TERMTYPE
  42 #endif
  43
  44 MODULE_ID("$Id: lib_screen.c,v 1.77 2015/07/04 22:54:14 tom Exp $")
  45
  46 #define MAX_SIZE 0x3fff         /* 16k is big enough for a window or pad */
  47
  48 #define MARKER '\\'
  49 #define APPEND '+'
  50 #define GUTTER '|'
  51 #define L_CURL '{'
  52 #define R_CURL '}'
  53
  54 /*
  55  * Use 0x8888 as the magic number for new-format files, since it cannot be
  56  * mistaken for the _cury/_curx pair of 16-bit numbers which start the old
  57  * format.  It happens to be unused in the file 5.22 database (2015/03/07).
  58  */
  59 static const char my_magic[] =
  60 {'\210', '\210', '\210', '\210'};
  61
  62 #if NCURSES_EXT_PUTWIN
  63 typedef enum {
  64     pINT                        /* int */
  65     ,pSHORT                     /* short */
  66     ,pBOOL                      /* bool */
  67     ,pATTR                      /* attr_t */
  68     ,pCHAR                      /* chtype */
  69     ,pSIZE                      /* NCURSES_SIZE_T */
  70 #if NCURSES_WIDECHAR
  71     ,pCCHAR                     /* cchar_t */
  72 #endif
  73 } PARAM_TYPE;
  74
  75 typedef struct {
  76     const char name[11];
  77     attr_t attr;
  78 } SCR_ATTRS;
  79
  80 typedef struct {
  81     const char name[17];
  82     PARAM_TYPE type;
  83     size_t size;
  84     size_t offset;
  85 } SCR_PARAMS;
  86
  87 #define DATA(name) { { #name }, A_##name }
  88 static const SCR_ATTRS scr_attrs[] =
  89 {
  90     DATA(NORMAL),
  91     DATA(STANDOUT),
  92     DATA(UNDERLINE),
  93     DATA(REVERSE),
  94     DATA(BLINK),
  95     DATA(DIM),
  96     DATA(BOLD),
  97     DATA(ALTCHARSET),
  98     DATA(INVIS),
  99     DATA(PROTECT),
 100     DATA(HORIZONTAL),
 101     DATA(LEFT),
 102     DATA(LOW),
 103     DATA(RIGHT),
 104     DATA(TOP),
 105     DATA(VERTICAL),
 106
 107 #ifdef A_ITALIC
 108     DATA(ITALIC),
 109 #endif
 110 };
 111 #undef DATA
 112
 113 #define sizeof2(type,name) sizeof(((type *)0)->name)
 114 #define DATA(name, type) { { #name }, type, sizeof2(WINDOW, name), offsetof(WINDOW, name) }
 115
 116 static const SCR_PARAMS scr_params[] =
 117 {
 118     DATA(_cury, pSIZE),
 119     DATA(_curx, pSIZE),
 120     DATA(_maxy, pSIZE),
 121     DATA(_maxx, pSIZE),
 122     DATA(_begy, pSIZE),
 123     DATA(_begx, pSIZE),
 124     DATA(_flags, pSHORT),
 125     DATA(_attrs, pATTR),
 126     DATA(_bkgd, pCHAR),
 127     DATA(_notimeout, pBOOL),
 128     DATA(_clear, pBOOL),
 129     DATA(_leaveok, pBOOL),
 130     DATA(_scroll, pBOOL),
 131     DATA(_idlok, pBOOL),
 132     DATA(_idcok, pBOOL),
 133     DATA(_immed, pBOOL),
 134     DATA(_sync, pBOOL),
 135     DATA(_use_keypad, pBOOL),
 136     DATA(_delay, pINT),
 137     DATA(_regtop, pSIZE),
 138     DATA(_regbottom, pSIZE),
 139     DATA(_pad._pad_y, pSIZE),
 140     DATA(_pad._pad_x, pSIZE),
 141     DATA(_pad._pad_top, pSIZE),
 142     DATA(_pad._pad_left, pSIZE),
 143     DATA(_pad._pad_bottom, pSIZE),
 144     DATA(_pad._pad_right, pSIZE),
 145     DATA(_yoffset, pSIZE),
 146 #if NCURSES_WIDECHAR
 147     DATA(_bkgrnd, pCCHAR),
 148 #if NCURSES_EXT_COLORS
 149     DATA(_color, pINT),
 150 #endif
 151 #endif
 152 };
 153 #undef DATA
 154
 155 static const NCURSES_CH_T blank = NewChar(BLANK_TEXT);
 156
 157 /*
 158  * Allocate and read a line of text.  Caller must free it.
 159  */
 160 static char *
 161 read_txt(FILE *fp)
 162 {
 163     size_t limit = 1024;
 164     size_t used = 0;
 165     char *result = malloc(limit);
 166     char *buffer;
 167
 168     if (result != 0) {
 169         int ch = 0;
 170
 171         clearerr(fp);
 172         result[used] = '\0';
 173         do {
 174             if (used + 2 >= limit) {
 175                 limit += 1024;
 176                 buffer = realloc(result, limit);
 177                 if (buffer == 0) {
 178                     free(result);
 179                     result = 0;
 180                     break;
 181                 }
 182                 result = buffer;
 183             }
 184             ch = fgetc(fp);
 185             if (ch == EOF)
 186                 break;
 187             result[used++] = (char) ch;
 188             result[used] = '\0';
 189         } while (ch != '\n');
 190
 191         if (ch == '\n') {
 192             result[--used] = '\0';
 193             T(("READ:%s", result));
 194         } else if (used == 0) {
 195             free(result);
 196             result = 0;
 197         }
 198     }
 199     return result;
 200 }
 201
 202 static char *
 203 decode_attr(char *source, attr_t *target, int *color)
 204 {
 205     bool found = FALSE;
 206
 207     T(("decode_attr   '%s'", source));
 208
 209     while (*source) {
 210         if (source[0] == MARKER && source[1] == L_CURL) {
 211             source += 2;
 212             found = TRUE;
 213         } else if (source[0] == R_CURL) {
 214             source++;
 215             found = FALSE;
 216         } else if (found) {
 217             size_t n;
 218             char *next = source;
 219
 220             if (source[0] == GUTTER) {
 221                 ++next;
 222             } else if (*next == 'C') {
 223                 int value = 0;
 224                 unsigned pair;
 225                 next++;
 226                 while (isdigit(UChar(*next))) {
 227                     value = value * 10 + (*next++ - '0');
 228                 }
 229                 *target &= ~A_COLOR;
 230                 pair = (unsigned) ((value > 256)
 231                                    ? COLOR_PAIR(255)
 232                                    : COLOR_PAIR(value));
 233                 *target |= pair;
 234                 *color = value;
 235             } else {
 236                 while (isalnum(UChar(*next))) {
 237                     ++next;
 238                 }
 239                 for (n = 0; n < SIZEOF(scr_attrs); ++n) {
 240                     if ((size_t) (next - source) == strlen(scr_attrs[n].name)) {
 241                         if (scr_attrs[n].attr) {
 242                             *target |= scr_attrs[n].attr;
 243                         } else {
 244                             *target = A_NORMAL;
 245                         }
 246                         break;
 247                     }
 248                 }
 249             }
 250             source = next;
 251         } else {
 252             break;
 253         }
 254     }
 255     return source;
 256 }
 257
 258 static char *
 259 decode_char(char *source, int *target)
 260 {
 261     int limit = 0;
 262     int base = 16;
 263     const char digits[] = "0123456789abcdef";
 264
 265     T(("decode_char   '%s'", source));
 266     *target = ' ';
 267     switch (*source) {
 268     case MARKER:
 269         switch (*++source) {
 270         case APPEND:
 271             break;
 272         case MARKER:
 273             *target = MARKER;
 274             ++source;
 275             break;
 276         case 's':
 277             *target = ' ';
 278             ++source;
 279             break;
 280         case '0':
 281         case '1':
 282         case '2':
 283         case '3':
 284             base = 8;
 285             limit = 3;
 286             break;
 287         case 'u':
 288             limit = 4;
 289             ++source;
 290             break;
 291         case 'U':
 292             limit = 8;
 293             ++source;
 294             break;
 295         }
 296         if (limit) {
 297             *target = 0;
 298             while (limit-- > 0) {
 299                 char *find = strchr(digits, *source++);
 300                 int ch = (find != 0) ? (int) (find - digits) : -1;
 301                 *target *= base;
 302                 if (ch >= 0 && ch < base) {
 303                     *target += ch;
 304                 }
 305             }
 306         }
 307         break;
 308     default:
 309         *target = *source++;
 310         break;
 311     }
 312     return source;
 313 }
 314
 315 static char *
 316 decode_chtype(char *source, chtype fillin, chtype *target)
 317 {
 318     attr_t attr = ChAttrOf(fillin);
 319     int color = PAIR_NUMBER((int) attr);
 320     int value;
 321
 322     T(("decode_chtype '%s'", source));
 323     source = decode_attr(source, &attr, &color);
 324     source = decode_char(source, &value);
 325     *target = (ChCharOf(value) | attr | (chtype) COLOR_PAIR(color));
 326     /* FIXME - ignore combining characters */
 327     return source;
 328 }
 329
 330 #if NCURSES_WIDECHAR
 331 static char *
 332 decode_cchar(char *source, cchar_t *fillin, cchar_t *target)
 333 {
 334     int color;
 335     attr_t attr = fillin->attr;
 336     wchar_t chars[CCHARW_MAX];
 337     int append = 0;
 338     int value = 0;
 339
 340     T(("decode_cchar  '%s'", source));
 341     *target = blank;
 342 #if NCURSES_EXT_COLORS
 343     color = fillin->ext_color;
 344 #else
 345     color = (int) PAIR_NUMBER(attr);
 346 #endif
 347     source = decode_attr(source, &attr, &color);
 348     memset(chars, 0, sizeof(chars));
 349     source = decode_char(source, &value);
 350     chars[0] = (wchar_t) value;
 351     /* handle combining characters */
 352     while (source[0] == MARKER && source[1] == APPEND) {
 353         source += 2;
 354         source = decode_char(source, &value);
 355         if (++append < CCHARW_MAX) {
 356             chars[append] = (wchar_t) value;
 357         }
 358     }
 359     setcchar(target, chars, attr, (short) color, NULL);
 360     return source;
 361 }
 362 #endif
 363
 364 static int
 365 read_win(WINDOW *win, FILE *fp)
 366 {
 367     int code = ERR;
 368     char *txt;
 369     char *name;
 370     char *value;
 371     size_t n;
 372     int color;
 373 #if NCURSES_WIDECHAR
 374     NCURSES_CH_T prior;
 375 #endif
 376     chtype prior2;
 377
 378     memset(win, 0, sizeof(WINDOW));
 379     for (;;) {
 380         txt = read_txt(fp);
 381         if (txt == 0)
 382             break;
 383         if (!strcmp(txt, "rows:")) {
 384             free(txt);
 385             code = OK;
 386             break;
 387         }
 388         if ((value = strchr(txt, '=')) == 0) {
 389             free(txt);
 390             continue;
 391         }
 392         *value++ = '\0';
 393         name = !strcmp(txt, "flag") ? value : txt;
 394         for (n = 0; n < SIZEOF(scr_params); ++n) {
 395             if (!strcmp(name, scr_params[n].name)) {
 396                 void *data = (void *) ((char *) win + scr_params[n].offset);
 397
 398                 switch (scr_params[n].type) {
 399                 case pATTR:
 400                     (void) decode_attr(value, data, &color);
 401                     break;
 402                 case pBOOL:
 403                     *(bool *) data = TRUE;
 404                     break;
 405                 case pCHAR:
 406                     prior2 = ' ';
 407                     decode_chtype(value, prior2, data);
 408                     break;
 409                 case pINT:
 410                     *(int *) data = atoi(value);
 411                     break;
 412                 case pSHORT:
 413                     *(short *) data = (short) atoi(value);
 414                     break;
 415                 case pSIZE:
 416                     *(NCURSES_SIZE_T *) data = (NCURSES_SIZE_T) atoi(value);
 417                     break;
 418 #if NCURSES_WIDECHAR
 419                 case pCCHAR:
 420                     prior = blank;
 421                     decode_cchar(value, &prior, data);
 422                     break;
 423 #endif
 424                 }
 425                 break;
 426             }
 427         }
 428         free(txt);
 429     }
 430     return code;
 431 }
 432
 433 static int
 434 read_row(char *source, NCURSES_CH_T * prior, NCURSES_CH_T * target, int length)
 435 {
 436     while (*source != '\0' && length > 0) {
 437 #if NCURSES_WIDECHAR
 438         int n, len;
 439         source = decode_cchar(source, prior, target);
 440         len = wcwidth(target->chars[0]);
 441         if (len > 1) {
 442             SetWidecExt(CHDEREF(target), 0);
 443             for (n = 1; n < len; ++n) {
 444                 target[n] = target[0];
 445                 SetWidecExt(CHDEREF(target), n);
 446             }
 447             target += (len - 1);
 448             length -= (len - 1);
 449         }
 450 #else
 451         source = decode_chtype(source, *prior, target);
 452 #endif
 453         *prior = *target;
 454         ++target;
 455         --length;
 456     }
 457     while (length-- > 0) {
 458         *target++ = blank;
 459     }
 460     /* FIXME - see what error conditions should apply if I need to return ERR */
 461     return 0;
 462 }
 463 #endif /* NCURSES_EXT_PUTWIN */
 464
 465 /*
 466  * Originally, getwin/putwin used fread/fwrite, because they used binary data.
 467  * The new format uses printable ASCII, which does not have as predictable
 468  * sizes.  Consequently, we use buffered I/O, e.g., fgetc/fprintf, which need
 469  * special handling if we want to read screen dumps from an older library.
 470  */
 471 static int
 472 read_block(void *target, size_t length, FILE *fp)
 473 {
 474     int result = 0;
 475     char *buffer = target;
 476
 477     clearerr(fp);
 478     while (length-- != 0) {
 479         int ch = fgetc(fp);
 480         if (ch == EOF) {
 481             result = -1;
 482             break;
 483         }
 484         *buffer++ = (char) ch;
 485     }
 486     return result;
 487 }
 488
 489 NCURSES_EXPORT(WINDOW *)
 490 NCURSES_SP_NAME(getwin) (NCURSES_SP_DCLx FILE *filep)
 491 {
 492     WINDOW tmp, *nwin;
 493     int n;
 494     bool old_format = FALSE;
 495
 496     T((T_CALLED("getwin(%p)"), (void *) filep));
 497
 498     if (filep == 0) {
 499         returnWin(0);
 500     }
 501
 502     /*
 503      * Read the first 4 bytes to determine first if this is an old-format
 504      * screen-dump, or new-format.
 505      */
 506     if (read_block(&tmp, 4, filep) < 0) {
 507         returnWin(0);
 508     }
 509     /*
 510      * If this is a new-format file, and we do not support it, give up.
 511      */
 512     if (!memcmp(&tmp, my_magic, 4)) {
 513 #if NCURSES_EXT_PUTWIN
 514         if (read_win(&tmp, filep) < 0)
 515 #endif
 516             returnWin(0);
 517     } else if (read_block(((char *) &tmp) + 4, sizeof(WINDOW) - 4, filep) < 0) {
 518         returnWin(0);
 519     } else {
 520         old_format = TRUE;
 521     }
 522
 523     /*
 524      * Check the window-size:
 525      */
 526     if (tmp._maxy == 0 ||
 527         tmp._maxy > MAX_SIZE ||
 528         tmp._maxx == 0 ||
 529         tmp._maxx > MAX_SIZE) {
 530         returnWin(0);
 531     }
 532
 533     if (tmp._flags & _ISPAD) {
 534         nwin = NCURSES_SP_NAME(newpad) (NCURSES_SP_ARGx
 535                                         tmp._maxy + 1,
 536                                         tmp._maxx + 1);
 537     } else {
 538         nwin = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
 539                                         tmp._maxy + 1,
 540                                         tmp._maxx + 1, 0, 0);
 541     }
 542
 543     /*
 544      * We deliberately do not restore the _parx, _pary, or _parent
 545      * fields, because the window hierarchy within which they
 546      * made sense is probably gone.
 547      */
 548     if (nwin != 0) {
 549         size_t linesize = sizeof(NCURSES_CH_T) * (size_t) (tmp._maxx + 1);
 550
 551         nwin->_curx = tmp._curx;
 552         nwin->_cury = tmp._cury;
 553         nwin->_maxy = tmp._maxy;
 554         nwin->_maxx = tmp._maxx;
 555         nwin->_begy = tmp._begy;
 556         nwin->_begx = tmp._begx;
 557         nwin->_yoffset = tmp._yoffset;
 558         nwin->_flags = tmp._flags & ~(_SUBWIN);
 559
 560         WINDOW_ATTRS(nwin) = WINDOW_ATTRS(&tmp);
 561         nwin->_nc_bkgd = tmp._nc_bkgd;
 562
 563         nwin->_notimeout = tmp._notimeout;
 564         nwin->_clear = tmp._clear;
 565         nwin->_leaveok = tmp._leaveok;
 566         nwin->_idlok = tmp._idlok;
 567         nwin->_idcok = tmp._idcok;
 568         nwin->_immed = tmp._immed;
 569         nwin->_scroll = tmp._scroll;
 570         nwin->_sync = tmp._sync;
 571         nwin->_use_keypad = tmp._use_keypad;
 572         nwin->_delay = tmp._delay;
 573
 574         nwin->_regtop = tmp._regtop;
 575         nwin->_regbottom = tmp._regbottom;
 576
 577         if (tmp._flags & _ISPAD)
 578             nwin->_pad = tmp._pad;
 579
 580         if (old_format) {
 581             T(("reading old-format screen dump"));
 582             for (n = 0; n <= nwin->_maxy; n++) {
 583                 if (read_block(nwin->_line[n].text, linesize, filep) < 0) {
 584                     delwin(nwin);
 585                     returnWin(0);
 586                 }
 587             }
 588         }
 589 #if NCURSES_EXT_PUTWIN
 590         else {
 591             char *txt;
 592             bool success = TRUE;
 593             NCURSES_CH_T prior = blank;
 594
 595             T(("reading new-format screen dump"));
 596             for (n = 0; n <= nwin->_maxy; n++) {
 597                 long row;
 598                 char *next;
 599
 600                 if ((txt = read_txt(filep)) == 0) {
 601                     T(("...failed to read string for row %d", n + 1));
 602                     success = FALSE;
 603                     break;
 604                 }
 605                 row = strtol(txt, &next, 10);
 606                 if (row != (n + 1) || *next != ':') {
 607                     T(("...failed to read row-number %d", n + 1));
 608                     success = FALSE;
 609                     break;
 610                 }
 611
 612                 if (read_row(++next, &prior, nwin->_line[n].text, tmp._maxx
 613                              + 1) < 0) {
 614                     T(("...failed to read cells for row %d", n + 1));
 615                     success = FALSE;
 616                     break;
 617                 }
 618                 free(txt);
 619                 txt = 0;
 620             }
 621
 622             if (!success) {
 623                 free(txt);
 624                 delwin(nwin);
 625                 returnWin(0);
 626             }
 627         }
 628 #endif
 629         touchwin(nwin);
 630     }
 631     returnWin(nwin);
 632 }
 633
 634 #if NCURSES_SP_FUNCS
 635 NCURSES_EXPORT(WINDOW *)
 636 getwin(FILE *filep)
 637 {
 638     return NCURSES_SP_NAME(getwin) (CURRENT_SCREEN, filep);
 639 }
 640 #endif
 641
 642 #if NCURSES_EXT_PUTWIN
 643 static void
 644 encode_attr(char *target, attr_t source, attr_t prior)
 645 {
 646     source &= ~A_CHARTEXT;
 647     prior &= ~A_CHARTEXT;
 648
 649     *target = '\0';
 650     if (source != prior) {
 651         size_t n;
 652         bool first = TRUE;
 653
 654         *target++ = MARKER;
 655         *target++ = L_CURL;
 656
 657         for (n = 0; n < SIZEOF(scr_attrs); ++n) {
 658             if ((source & scr_attrs[n].attr) != 0 ||
 659                 ((source & ALL_BUT_COLOR) == 0 &&
 660                  (scr_attrs[n].attr == A_NORMAL))) {
 661                 if (first) {
 662                     first = FALSE;
 663                 } else {
 664                     *target++ = '|';
 665                 }
 666                 strcpy(target, scr_attrs[n].name);
 667                 target += strlen(target);
 668             }
 669         }
 670         if ((source & A_COLOR) != (prior & A_COLOR)) {
 671             if (!first)
 672                 *target++ = '|';
 673             sprintf(target, "C%d", PAIR_NUMBER((int) source));
 674             target += strlen(target);
 675         }
 676
 677         *target++ = R_CURL;
 678         *target = '\0';
 679     }
 680 }
 681
 682 static void
 683 encode_cell(char *target, CARG_CH_T source, CARG_CH_T previous)
 684 {
 685 #if NCURSES_WIDECHAR
 686     size_t n;
 687
 688     *target = '\0';
 689     if (previous->attr != source->attr) {
 690         encode_attr(target, source->attr, previous->attr);
 691     }
 692     target += strlen(target);
 693 #if NCURSES_EXT_COLORS
 694     if (previous->ext_color != source->ext_color) {
 695         sprintf(target, "%c%cC%d%c", MARKER, L_CURL, source->ext_color, R_CURL);
 696     }
 697 #endif
 698     for (n = 0; n < SIZEOF(source->chars); ++n) {
 699         unsigned uch = (unsigned) source->chars[n];
 700         if (uch == 0)
 701             continue;
 702         if (n) {
 703             *target++ = MARKER;
 704             *target++ = APPEND;
 705         }
 706         *target++ = MARKER;
 707         if (uch > 0xffff) {
 708             sprintf(target, "U%08x", uch);
 709         } else if (uch > 0xff) {
 710             sprintf(target, "u%04x", uch);
 711         } else if (uch < 32 || uch >= 127) {
 712             sprintf(target, "%03o", uch & 0xff);
 713         } else {
 714             switch (uch) {
 715             case ' ':
 716                 strcpy(target, "s");
 717                 break;
 718             case MARKER:
 719                 *target++ = MARKER;
 720                 *target = '\0';
 721                 break;
 722             default:
 723                 sprintf(--target, "%c", uch);
 724                 break;
 725             }
 726         }
 727         target += strlen(target);
 728     }
 729 #else
 730     chtype ch = CharOfD(source);
 731
 732     *target = '\0';
 733     if (AttrOfD(previous) != AttrOfD(source)) {
 734         encode_attr(target, AttrOfD(source), AttrOfD(previous));
 735     }
 736     target += strlen(target);
 737     *target++ = MARKER;
 738     if (ch < 32 || ch >= 127) {
 739         sprintf(target, "%03o", UChar(ch));
 740     } else {
 741         switch (ch) {
 742         case ' ':
 743             strcpy(target, "s");
 744             break;
 745         case MARKER:
 746             *target++ = MARKER;
 747             *target = '\0';
 748             break;
 749         default:
 750             sprintf(--target, "%c", UChar(ch));
 751             break;
 752         }
 753     }
 754     target += strlen(target);
 755 #endif
 756 }
 757 #endif
 758
 759 NCURSES_EXPORT(int)
 760 putwin(WINDOW *win, FILE *filep)
 761 {
 762     int code = ERR;
 763     int y;
 764
 765     T((T_CALLED("putwin(%p,%p)"), (void *) win, (void *) filep));
 766
 767 #if NCURSES_EXT_PUTWIN
 768     if (win != 0) {
 769         const char *version = curses_version();
 770         char buffer[1024];
 771         NCURSES_CH_T last_cell;
 772
 773         memset(&last_cell, 0, sizeof(last_cell));
 774
 775         clearerr(filep);
 776
 777         /*
 778          * Our magic number is technically nonprinting, but aside from that,
 779          * all of the file is printable ASCII.
 780          */
 781 #define PUTS(s) if (fputs(s, filep) == EOF || ferror(filep)) returnCode(code)
 782         PUTS(my_magic);
 783         PUTS(version);
 784         PUTS("\n");
 785         for (y = 0; y < (int) SIZEOF(scr_params); ++y) {
 786             const char *name = scr_params[y].name;
 787             const char *data = (char *) win + scr_params[y].offset;
 788             const void *dp = (const void *) data;
 789
 790             *buffer = '\0';
 791             if (!strncmp(name, "_pad.", 5) && !(win->_flags & _ISPAD)) {
 792                 continue;
 793             }
 794             switch (scr_params[y].type) {
 795             case pATTR:
 796                 encode_attr(buffer, (*(const attr_t *) dp) & ~A_CHARTEXT, A_NORMAL);
 797                 break;
 798             case pBOOL:
 799                 if (!(*(const bool *) data)) {
 800                     continue;
 801                 }
 802                 strcpy(buffer, name);
 803                 name = "flag";
 804                 break;
 805             case pCHAR:
 806                 encode_attr(buffer, *(const attr_t *) dp, A_NORMAL);
 807                 break;
 808             case pINT:
 809                 if (!(*(const int *) dp))
 810                     continue;
 811                 sprintf(buffer, "%d", *(const int *) dp);
 812                 break;
 813             case pSHORT:
 814                 if (!(*(const short *) dp))
 815                     continue;
 816                 sprintf(buffer, "%d", *(const short *) dp);
 817                 break;
 818             case pSIZE:
 819                 if (!(*(const NCURSES_SIZE_T *) dp))
 820                     continue;
 821                 sprintf(buffer, "%d", *(const NCURSES_SIZE_T *) dp);
 822                 break;
 823 #if NCURSES_WIDECHAR
 824             case pCCHAR:
 825                 encode_cell(buffer, (CARG_CH_T) dp, CHREF(last_cell));
 826                 break;
 827 #endif
 828             }
 829             /*
 830              * Only write non-default data.
 831              */
 832             if (*buffer != '\0') {
 833                 if (fprintf(filep, "%s=%s\n", name, buffer) <= 0
 834                     || ferror(filep))
 835                     returnCode(code);
 836             }
 837         }
 838         /* Write row-data */
 839         fprintf(filep, "rows:\n");
 840         for (y = 0; y <= win->_maxy; y++) {
 841             NCURSES_CH_T *data = win->_line[y].text;
 842             int x;
 843             if (fprintf(filep, "%d:", y + 1) <= 0
 844                 || ferror(filep))
 845                 returnCode(code);
 846             for (x = 0; x <= win->_maxx; x++) {
 847 #if NCURSES_WIDECHAR
 848                 int len = wcwidth(data[x].chars[0]);
 849                 encode_cell(buffer, CHREF(data[x]), CHREF(last_cell));
 850                 last_cell = data[x];
 851                 PUTS(buffer);
 852                 if (len > 1)
 853                     x += (len - 1);
 854 #else
 855                 encode_cell(buffer, CHREF(data[x]), CHREF(last_cell));
 856                 last_cell = data[x];
 857                 PUTS(buffer);
 858 #endif
 859             }
 860             PUTS("\n");
 861         }
 862     }
 863 #else
 864     /*
 865      * This is the original putwin():
 866      * A straight binary dump is simple, but its format can depend on whether
 867      * ncurses is compiled with wide-character support, and also may depend
 868      * on the version of ncurses, e.g., if the WINDOW structure is extended.
 869      */
 870     if (win != 0) {
 871         size_t len = (size_t) (win->_maxx + 1);
 872
 873         clearerr(filep);
 874         if (fwrite(win, sizeof(WINDOW), (size_t) 1, filep) != 1
 875             || ferror(filep))
 876               returnCode(code);
 877
 878         for (y = 0; y <= win->_maxy; y++) {
 879             if (fwrite(win->_line[y].text,
 880                        sizeof(NCURSES_CH_T), len, filep) != len
 881                 || ferror(filep)) {
 882                 returnCode(code);
 883             }
 884         }
 885         code = OK;
 886     }
 887 #endif
 888     returnCode(code);
 889 }
 890
 891 NCURSES_EXPORT(int)
 892 NCURSES_SP_NAME(scr_restore) (NCURSES_SP_DCLx const char *file)
 893 {
 894     FILE *fp = 0;
 895     int code = ERR;
 896
 897     T((T_CALLED("scr_restore(%p,%s)"), (void *) SP_PARM, _nc_visbuf(file)));
 898
 899     if (_nc_access(file, R_OK) >= 0
 900         && (fp = fopen(file, "rb")) != 0) {
 901         delwin(NewScreen(SP_PARM));
 902         NewScreen(SP_PARM) = getwin(fp);
 903 #if !USE_REENTRANT
 904         newscr = NewScreen(SP_PARM);
 905 #endif
 906         (void) fclose(fp);
 907         if (NewScreen(SP_PARM) != 0) {
 908             code = OK;
 909         }
 910     }
 911     returnCode(code);
 912 }
 913
 914 #if NCURSES_SP_FUNCS
 915 NCURSES_EXPORT(int)
 916 scr_restore(const char *file)
 917 {
 918     return NCURSES_SP_NAME(scr_restore) (CURRENT_SCREEN, file);
 919 }
 920 #endif
 921
 922 NCURSES_EXPORT(int)
 923 scr_dump(const char *file)
 924 {
 925     int result;
 926     FILE *fp = 0;
 927
 928     T((T_CALLED("scr_dump(%s)"), _nc_visbuf(file)));
 929
 930     if (_nc_access(file, W_OK) < 0
 931         || (fp = fopen(file, "wb")) == 0) {
 932         result = ERR;
 933     } else {
 934         (void) putwin(newscr, fp);
 935         (void) fclose(fp);
 936         result = OK;
 937     }
 938     returnCode(result);
 939 }
 940
 941 NCURSES_EXPORT(int)
 942 NCURSES_SP_NAME(scr_init) (NCURSES_SP_DCLx const char *file)
 943 {
 944     FILE *fp = 0;
 945     int code = ERR;
 946
 947     T((T_CALLED("scr_init(%p,%s)"), (void *) SP_PARM, _nc_visbuf(file)));
 948
 949     if (SP_PARM != 0 &&
 950 #ifdef USE_TERM_DRIVER
 951         InfoOf(SP_PARM).caninit
 952 #else
 953         !(exit_ca_mode && non_rev_rmcup)
 954 #endif
 955         ) {
 956         if (_nc_access(file, R_OK) >= 0
 957             && (fp = fopen(file, "rb")) != 0) {
 958             delwin(CurScreen(SP_PARM));
 959             CurScreen(SP_PARM) = getwin(fp);
 960 #if !USE_REENTRANT
 961             curscr = CurScreen(SP_PARM);
 962 #endif
 963             (void) fclose(fp);
 964             if (CurScreen(SP_PARM) != 0) {
 965                 code = OK;
 966             }
 967         }
 968     }
 969     returnCode(code);
 970 }
 971
 972 #if NCURSES_SP_FUNCS
 973 NCURSES_EXPORT(int)
 974 scr_init(const char *file)
 975 {
 976     return NCURSES_SP_NAME(scr_init) (CURRENT_SCREEN, file);
 977 }
 978 #endif
 979
 980 NCURSES_EXPORT(int)
 981 NCURSES_SP_NAME(scr_set) (NCURSES_SP_DCLx const char *file)
 982 {
 983     int code = ERR;
 984
 985     T((T_CALLED("scr_set(%p,%s)"), (void *) SP_PARM, _nc_visbuf(file)));
 986
 987     if (NCURSES_SP_NAME(scr_init) (NCURSES_SP_ARGx file) == OK) {
 988         delwin(NewScreen(SP_PARM));
 989         NewScreen(SP_PARM) = dupwin(curscr);
 990 #if !USE_REENTRANT
 991         newscr = NewScreen(SP_PARM);
 992 #endif
 993         if (NewScreen(SP_PARM) != 0) {
 994             code = OK;
 995         }
 996     }
 997     returnCode(code);
 998 }
 999
1000 #if NCURSES_SP_FUNCS
1001 NCURSES_EXPORT(int)
1002 scr_set(const char *file)
1003 {
1004     return NCURSES_SP_NAME(scr_set) (CURRENT_SCREEN, file);
1005 }
1006 #endif