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

   1 /****************************************************************************
   2  * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
   3  *                                                                          *
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   5  * copy of this software and associated documentation files (the            *
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  11  *                                                                          *
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  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               *
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  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
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  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
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  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 /*
  37 **      lib_set_term.c
  38 **
  39 **      The routine set_term().
  40 **
  41 */
  42
  43 #include <curses.priv.h>
  44 #include <tic.h>
  45
  46 #ifndef CUR
  47 #define CUR SP_TERMTYPE
  48 #endif
  49
  50 MODULE_ID("$Id: lib_set_term.c,v 1.138 2010/12/20 00:42:20 tom Exp $")
  51
  52 #ifdef USE_TERM_DRIVER
  53 #define MaxColors      InfoOf(sp).maxcolors
  54 #define NumLabels      InfoOf(sp).numlabels
  55 #else
  56 #define MaxColors      max_colors
  57 #define NumLabels      num_labels
  58 #endif
  59
  60 NCURSES_EXPORT(SCREEN *)
  61 set_term(SCREEN *screenp)
  62 {
  63     SCREEN *oldSP;
  64     SCREEN *newSP;
  65
  66     T((T_CALLED("set_term(%p)"), (void *) screenp));
  67
  68     _nc_lock_global(curses);
  69
  70     oldSP = CURRENT_SCREEN;
  71     _nc_set_screen(screenp);
  72     newSP = screenp;
  73
  74     if (newSP != 0) {
  75         TINFO_SET_CURTERM(newSP, newSP->_term);
  76 #if !USE_REENTRANT
  77         curscr = CurScreen(newSP);
  78         newscr = NewScreen(newSP);
  79         stdscr = StdScreen(newSP);
  80         COLORS = newSP->_color_count;
  81         COLOR_PAIRS = newSP->_pair_count;
  82 #endif
  83     } else {
  84         TINFO_SET_CURTERM(oldSP, 0);
  85 #if !USE_REENTRANT
  86         curscr = 0;
  87         newscr = 0;
  88         stdscr = 0;
  89         COLORS = 0;
  90         COLOR_PAIRS = 0;
  91 #endif
  92     }
  93
  94     _nc_unlock_global(curses);
  95
  96     T((T_RETURN("%p"), (void *) oldSP));
  97     return (oldSP);
  98 }
  99
 100 static void
 101 _nc_free_keytry(TRIES * kt)
 102 {
 103     if (kt != 0) {
 104         _nc_free_keytry(kt->child);
 105         _nc_free_keytry(kt->sibling);
 106         free(kt);
 107     }
 108 }
 109
 110 static bool
 111 delink_screen(SCREEN *sp)
 112 {
 113     SCREEN *last = 0;
 114     SCREEN *temp;
 115     bool result = FALSE;
 116
 117     for (each_screen(temp)) {
 118         if (temp == sp) {
 119             if (last)
 120                 last->_next_screen = sp->_next_screen;
 121             else
 122                 _nc_screen_chain = sp->_next_screen;
 123             result = TRUE;
 124             break;
 125         }
 126         last = temp;
 127     }
 128     return result;
 129 }
 130
 131 /*
 132  * Free the storage associated with the given SCREEN sp.
 133  */
 134 NCURSES_EXPORT(void)
 135 delscreen(SCREEN *sp)
 136 {
 137     int i;
 138
 139     T((T_CALLED("delscreen(%p)"), (void *) sp));
 140
 141     _nc_lock_global(curses);
 142     if (delink_screen(sp)) {
 143 #ifdef USE_SP_RIPOFF
 144         ripoff_t *rop;
 145         if (safe_ripoff_sp && safe_ripoff_sp != safe_ripoff_stack) {
 146             for (rop = safe_ripoff_stack;
 147                  rop != safe_ripoff_sp && (rop - safe_ripoff_stack) < N_RIPS;
 148                  rop++) {
 149                 if (rop->win) {
 150                     (void) delwin(rop->win);
 151                     rop->win = 0;
 152                 }
 153             }
 154         }
 155 #endif
 156
 157         (void) _nc_freewin(CurScreen(sp));
 158         (void) _nc_freewin(NewScreen(sp));
 159         (void) _nc_freewin(StdScreen(sp));
 160
 161         if (sp->_slk != 0) {
 162             if (sp->_slk->ent != 0) {
 163                 for (i = 0; i < sp->_slk->labcnt; ++i) {
 164                     FreeIfNeeded(sp->_slk->ent[i].ent_text);
 165                     FreeIfNeeded(sp->_slk->ent[i].form_text);
 166                 }
 167                 free(sp->_slk->ent);
 168             }
 169             free(sp->_slk);
 170             sp->_slk = 0;
 171         }
 172
 173         _nc_free_keytry(sp->_keytry);
 174         sp->_keytry = 0;
 175
 176         _nc_free_keytry(sp->_key_ok);
 177         sp->_key_ok = 0;
 178
 179         FreeIfNeeded(sp->_current_attr);
 180
 181         FreeIfNeeded(sp->_color_table);
 182         FreeIfNeeded(sp->_color_pairs);
 183
 184         FreeIfNeeded(sp->oldhash);
 185         FreeIfNeeded(sp->newhash);
 186         FreeIfNeeded(sp->hashtab);
 187
 188         FreeIfNeeded(sp->_acs_map);
 189         FreeIfNeeded(sp->_screen_acs_map);
 190
 191         /*
 192          * If the associated output stream has been closed, we can discard the
 193          * set-buffer.  Limit the error check to EBADF, since fflush may fail
 194          * for other reasons than trying to operate upon a closed stream.
 195          */
 196         if (sp->_ofp != 0
 197             && sp->_setbuf != 0
 198             && fflush(sp->_ofp) != 0
 199             && errno == EBADF) {
 200             free(sp->_setbuf);
 201         }
 202
 203         NCURSES_SP_NAME(del_curterm) (NCURSES_SP_ARGx sp->_term);
 204         free(sp);
 205
 206         /*
 207          * If this was the current screen, reset everything that the
 208          * application might try to use (except cur_term, which may have
 209          * multiple references in different screens).
 210          */
 211         if (sp == CURRENT_SCREEN) {
 212 #if !USE_REENTRANT
 213             curscr = 0;
 214             newscr = 0;
 215             stdscr = 0;
 216             COLORS = 0;
 217             COLOR_PAIRS = 0;
 218 #endif
 219             _nc_set_screen(0);
 220         }
 221     }
 222     _nc_unlock_global(curses);
 223
 224     returnVoid;
 225 }
 226
 227 static bool
 228 no_mouse_event(SCREEN *sp GCC_UNUSED)
 229 {
 230     return FALSE;
 231 }
 232
 233 static bool
 234 no_mouse_inline(SCREEN *sp GCC_UNUSED)
 235 {
 236     return FALSE;
 237 }
 238
 239 static bool
 240 no_mouse_parse(SCREEN *sp GCC_UNUSED, int code GCC_UNUSED)
 241 {
 242     return TRUE;
 243 }
 244
 245 static void
 246 no_mouse_resume(SCREEN *sp GCC_UNUSED)
 247 {
 248 }
 249
 250 static void
 251 no_mouse_wrap(SCREEN *sp GCC_UNUSED)
 252 {
 253 }
 254
 255 #if NCURSES_EXT_FUNCS && USE_COLORFGBG
 256 static char *
 257 extract_fgbg(char *src, int *result)
 258 {
 259     char *dst = 0;
 260     long value = strtol(src, &dst, 0);
 261
 262     if (dst == 0) {
 263         dst = src;
 264     } else if (value >= 0) {
 265         *result = value;
 266     }
 267     while (*dst != 0 && *dst != ';')
 268         dst++;
 269     if (*dst == ';')
 270         dst++;
 271     return dst;
 272 }
 273 #endif
 274
 275 #define ReturnScreenError() _nc_set_screen(0); \
 276                             returnCode(ERR)
 277
 278 /* OS-independent screen initializations */
 279 NCURSES_EXPORT(int)
 280 NCURSES_SP_NAME(_nc_setupscreen) (
 281 #if NCURSES_SP_FUNCS
 282                                      SCREEN **spp,
 283 #endif
 284                                      int slines,
 285                                      int scolumns,
 286                                      FILE *output,
 287                                      bool filtered,
 288                                      int slk_format)
 289 {
 290     char *env;
 291     int bottom_stolen = 0;
 292     ripoff_t *rop;
 293     SCREEN *sp;
 294 #ifndef USE_TERM_DRIVER
 295     bool support_cookies = USE_XMC_SUPPORT;
 296 #endif
 297
 298     T((T_CALLED("_nc_setupscreen(%d, %d, %p, %d, %d)"),
 299        slines, scolumns, (void *) output, filtered, slk_format));
 300
 301     assert(CURRENT_SCREEN == 0);        /* has been reset in newterm() ! */
 302
 303 #if NCURSES_SP_FUNCS
 304     assert(spp != 0);
 305     sp = *spp;
 306
 307     if (!sp) {
 308         sp = _nc_alloc_screen_sp();
 309         *spp = sp;
 310     }
 311     if (!sp
 312         || ((sp->_acs_map = typeCalloc(chtype, ACS_LEN)) == 0)
 313         || ((sp->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == 0)) {
 314         ReturnScreenError();
 315     }
 316
 317     T(("created SP %p", (void *) sp));
 318     sp->_next_screen = _nc_screen_chain;
 319     _nc_screen_chain = sp;
 320
 321     if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0) {
 322         ReturnScreenError();
 323     }
 324 #else
 325     if (!_nc_alloc_screen()
 326         || ((SP->_acs_map = typeCalloc(chtype, ACS_LEN)) == 0)
 327         || ((SP->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == 0)) {
 328         returnCode(ERR);
 329     }
 330
 331     T(("created SP %p", (void *) SP));
 332
 333     sp = SP;                    /* fixup so SET_LINES and SET_COLS works */
 334     sp->_next_screen = _nc_screen_chain;
 335     _nc_screen_chain = sp;
 336
 337     if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0)
 338         returnCode(ERR);
 339 #endif
 340
 341     /*
 342      * We should always check the screensize, just in case.
 343      */
 344     _nc_set_screen(sp);
 345     sp->_term = cur_term;
 346 #ifdef USE_TERM_DRIVER
 347     TCBOf(sp)->csp = sp;
 348     _nc_get_screensize(sp, sp->_term, &slines, &scolumns);
 349 #else
 350     _nc_get_screensize(sp, &slines, &scolumns);
 351 #endif
 352     SET_LINES(slines);
 353     SET_COLS(scolumns);
 354
 355     T((T_CREATE("screen %s %dx%d"),
 356        NCURSES_SP_NAME(termname) (NCURSES_SP_ARG), slines, scolumns));
 357
 358     sp->_filtered = filtered;
 359
 360     /* implement filter mode */
 361     if (filtered) {
 362         slines = 1;
 363         SET_LINES(slines);
 364 #ifdef USE_TERM_DRIVER
 365         CallDriver(sp, setfilter);
 366 #else
 367         clear_screen = 0;
 368         cursor_down = parm_down_cursor = 0;
 369         cursor_address = 0;
 370         cursor_up = parm_up_cursor = 0;
 371         row_address = 0;
 372
 373         cursor_home = carriage_return;
 374 #endif
 375         T(("filter screensize %dx%d", slines, scolumns));
 376     }
 377 #ifdef __DJGPP__
 378     T(("setting output mode to binary"));
 379     fflush(output);
 380     setmode(output, O_BINARY);
 381 #endif
 382     NCURSES_SP_NAME(_nc_set_buffer) (NCURSES_SP_ARGx output, TRUE);
 383     sp->_lines = (NCURSES_SIZE_T) slines;
 384     sp->_lines_avail = (NCURSES_SIZE_T) slines;
 385     sp->_columns = (NCURSES_SIZE_T) scolumns;
 386     sp->_ofp = output;
 387     SP_PRE_INIT(sp);
 388     SetNoPadding(sp);
 389
 390 #if NCURSES_EXT_FUNCS
 391     sp->_default_color = FALSE;
 392     sp->_has_sgr_39_49 = FALSE;
 393
 394     /*
 395      * Set our assumption of the terminal's default foreground and background
 396      * colors.  The curs_color man-page states that we can assume that the
 397      * background is black.  The origin of this assumption appears to be
 398      * terminals that displayed colored text, but no colored backgrounds, e.g.,
 399      * the first colored terminals around 1980.  More recent ones with better
 400      * technology can display not only colored backgrounds, but all
 401      * combinations.  So a terminal might be something other than "white" on
 402      * black (green/black looks monochrome too), but black on white or even
 403      * on ivory.
 404      *
 405      * White-on-black is the simplest thing to use for monochrome.  Almost
 406      * all applications that use color paint both text and background, so
 407      * the distinction is moot.  But a few do not - which is why we leave this
 408      * configurable (a better solution is to use assume_default_colors() for
 409      * the rare applications that do require that sort of appearance, since
 410      * is appears that more users expect to be able to make a white-on-black
 411      * or black-on-white display under control of the application than not).
 412      */
 413 #ifdef USE_ASSUMED_COLOR
 414     sp->_default_fg = COLOR_WHITE;
 415     sp->_default_bg = COLOR_BLACK;
 416 #else
 417     sp->_default_fg = C_MASK;
 418     sp->_default_bg = C_MASK;
 419 #endif
 420
 421     /*
 422      * Allow those assumed/default color assumptions to be overridden at
 423      * runtime:
 424      */
 425     if ((env = getenv("NCURSES_ASSUMED_COLORS")) != 0) {
 426         int fg, bg;
 427         char sep1, sep2;
 428         int count = sscanf(env, "%d%c%d%c", &fg, &sep1, &bg, &sep2);
 429         if (count >= 1) {
 430             sp->_default_fg = ((fg >= 0 && fg < MaxColors) ? fg : C_MASK);
 431             if (count >= 3) {
 432                 sp->_default_bg = ((bg >= 0 && bg < MaxColors) ? bg : C_MASK);
 433             }
 434             TR(TRACE_CHARPUT | TRACE_MOVE,
 435                ("from environment assumed fg=%d, bg=%d",
 436                 sp->_default_fg,
 437                 sp->_default_bg));
 438         }
 439     }
 440 #if USE_COLORFGBG
 441     /*
 442      * If rxvt's $COLORFGBG variable is set, use it to specify the assumed
 443      * default colors.  Note that rxvt (mis)uses bold colors, equating a bold
 444      * color to that value plus 8.  We'll only use the non-bold color for now -
 445      * decide later if it is worth having default attributes as well.
 446      */
 447     if (getenv("COLORFGBG") != 0) {
 448         char *p = getenv("COLORFGBG");
 449         TR(TRACE_CHARPUT | TRACE_MOVE, ("decoding COLORFGBG %s", p));
 450         p = extract_fgbg(p, &(sp->_default_fg));
 451         p = extract_fgbg(p, &(sp->_default_bg));
 452         if (*p)                 /* assume rxvt was compiled with xpm support */
 453             p = extract_fgbg(p, &(sp->_default_bg));
 454         TR(TRACE_CHARPUT | TRACE_MOVE, ("decoded fg=%d, bg=%d",
 455                                         sp->_default_fg, sp->_default_bg));
 456         if (sp->_default_fg >= MaxColors) {
 457             if (set_a_foreground != ABSENT_STRING
 458                 && !strcmp(set_a_foreground, "\033[3%p1%dm")) {
 459                 set_a_foreground = "\033[3%?%p1%{8}%>%t9%e%p1%d%;m";
 460             } else {
 461                 sp->_default_fg %= MaxColors;
 462             }
 463         }
 464         if (sp->_default_bg >= MaxColors) {
 465             if (set_a_background != ABSENT_STRING
 466                 && !strcmp(set_a_background, "\033[4%p1%dm")) {
 467                 set_a_background = "\033[4%?%p1%{8}%>%t9%e%p1%d%;m";
 468             } else {
 469                 sp->_default_bg %= MaxColors;
 470             }
 471         }
 472     }
 473 #endif
 474 #endif /* NCURSES_EXT_FUNCS */
 475
 476     sp->_maxclick = DEFAULT_MAXCLICK;
 477     sp->_mouse_event = no_mouse_event;
 478     sp->_mouse_inline = no_mouse_inline;
 479     sp->_mouse_parse = no_mouse_parse;
 480     sp->_mouse_resume = no_mouse_resume;
 481     sp->_mouse_wrap = no_mouse_wrap;
 482     sp->_mouse_fd = -1;
 483
 484     /*
 485      * If we've no magic cookie support, we suppress attributes that xmc would
 486      * affect, i.e., the attributes that affect the rendition of a space.
 487      */
 488     sp->_ok_attributes = NCURSES_SP_NAME(termattrs) (NCURSES_SP_ARG);
 489     if (NCURSES_SP_NAME(has_colors) (NCURSES_SP_ARG)) {
 490         sp->_ok_attributes |= A_COLOR;
 491     }
 492 #ifdef USE_TERM_DRIVER
 493     _nc_cookie_init(sp);
 494 #else
 495 #if USE_XMC_SUPPORT
 496     /*
 497      * If we have no magic-cookie support compiled-in, or if it is suppressed
 498      * in the environment, reset the support-flag.
 499      */
 500     if (magic_cookie_glitch >= 0) {
 501         if (getenv("NCURSES_NO_MAGIC_COOKIE") != 0) {
 502             support_cookies = FALSE;
 503         }
 504     }
 505 #endif
 506
 507     if (!support_cookies && magic_cookie_glitch >= 0) {
 508         T(("will disable attributes to work w/o magic cookies"));
 509     }
 510
 511     if (magic_cookie_glitch > 0) {      /* tvi, wyse */
 512
 513         sp->_xmc_triggers = sp->_ok_attributes & (
 514                                                      A_STANDOUT |
 515                                                      A_UNDERLINE |
 516                                                      A_REVERSE |
 517                                                      A_BLINK |
 518                                                      A_DIM |
 519                                                      A_BOLD |
 520                                                      A_INVIS |
 521                                                      A_PROTECT
 522             );
 523 #if 0
 524         /*
 525          * We "should" treat colors as an attribute.  The wyse350 (and its
 526          * clones) appear to be the only ones that have both colors and magic
 527          * cookies.
 528          */
 529         if (has_colors()) {
 530             sp->_xmc_triggers |= A_COLOR;
 531         }
 532 #endif
 533         sp->_xmc_suppress = sp->_xmc_triggers & (chtype) ~(A_BOLD);
 534
 535         T(("magic cookie attributes %s", _traceattr(sp->_xmc_suppress)));
 536         /*
 537          * Supporting line-drawing may be possible.  But make the regular
 538          * video attributes work first.
 539          */
 540         acs_chars = ABSENT_STRING;
 541         ena_acs = ABSENT_STRING;
 542         enter_alt_charset_mode = ABSENT_STRING;
 543         exit_alt_charset_mode = ABSENT_STRING;
 544 #if USE_XMC_SUPPORT
 545         /*
 546          * To keep the cookie support simple, suppress all of the optimization
 547          * hooks except for clear_screen and the cursor addressing.
 548          */
 549         if (support_cookies) {
 550             clr_eol = ABSENT_STRING;
 551             clr_eos = ABSENT_STRING;
 552             set_attributes = ABSENT_STRING;
 553         }
 554 #endif
 555     } else if (magic_cookie_glitch == 0) {      /* hpterm */
 556     }
 557
 558     /*
 559      * If magic cookies are not supported, cancel the strings that set
 560      * video attributes.
 561      */
 562     if (!support_cookies && magic_cookie_glitch >= 0) {
 563         magic_cookie_glitch = ABSENT_NUMERIC;
 564         set_attributes = ABSENT_STRING;
 565         enter_blink_mode = ABSENT_STRING;
 566         enter_bold_mode = ABSENT_STRING;
 567         enter_dim_mode = ABSENT_STRING;
 568         enter_reverse_mode = ABSENT_STRING;
 569         enter_standout_mode = ABSENT_STRING;
 570         enter_underline_mode = ABSENT_STRING;
 571     }
 572
 573     /* initialize normal acs before wide, since we use mapping in the latter */
 574 #if !USE_WIDEC_SUPPORT
 575     if (_nc_unicode_locale() && _nc_locale_breaks_acs(sp->_term)) {
 576         acs_chars = NULL;
 577         ena_acs = NULL;
 578         enter_alt_charset_mode = NULL;
 579         exit_alt_charset_mode = NULL;
 580         set_attributes = NULL;
 581     }
 582 #endif
 583 #endif
 584
 585     NCURSES_SP_NAME(_nc_init_acs) (NCURSES_SP_ARG);
 586 #if USE_WIDEC_SUPPORT
 587     _nc_init_wacs();
 588
 589     sp->_screen_acs_fix = (_nc_unicode_locale()
 590                            && _nc_locale_breaks_acs(sp->_term));
 591 #endif
 592     env = _nc_get_locale();
 593     sp->_legacy_coding = ((env == 0)
 594                           || !strcmp(env, "C")
 595                           || !strcmp(env, "POSIX"));
 596     T(("legacy-coding %d", sp->_legacy_coding));
 597
 598     sp->_nc_sp_idcok = TRUE;
 599     sp->_nc_sp_idlok = FALSE;
 600
 601     sp->oldhash = 0;
 602     sp->newhash = 0;
 603
 604     T(("creating newscr"));
 605     NewScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
 606                                              0, 0);
 607     if (NewScreen(sp) == 0) {
 608         ReturnScreenError();
 609     }
 610     T(("creating curscr"));
 611     CurScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
 612                                              0, 0);
 613     if (CurScreen(sp) == 0) {
 614         ReturnScreenError();
 615     }
 616 #if !USE_REENTRANT
 617     newscr = NewScreen(sp);
 618     curscr = CurScreen(sp);
 619 #endif
 620 #if USE_SIZECHANGE
 621     sp->_resize = NCURSES_SP_NAME(resizeterm);
 622 #endif
 623
 624     NewScreen(sp)->_clear = TRUE;
 625     CurScreen(sp)->_clear = FALSE;
 626
 627     NCURSES_SP_NAME(def_shell_mode) (NCURSES_SP_ARG);
 628     NCURSES_SP_NAME(def_prog_mode) (NCURSES_SP_ARG);
 629
 630     if (safe_ripoff_sp && safe_ripoff_sp != safe_ripoff_stack) {
 631         for (rop = safe_ripoff_stack;
 632              rop != safe_ripoff_sp && (rop - safe_ripoff_stack) < N_RIPS;
 633              rop++) {
 634
 635             /* If we must simulate soft labels, grab off the line to be used.
 636                We assume that we must simulate, if it is none of the standard
 637                formats (4-4 or 3-2-3) for which there may be some hardware
 638                support. */
 639             if (rop->hook == _nc_slk_initialize) {
 640                 if (!(NumLabels <= 0 || !SLK_STDFMT(slk_format))) {
 641                     continue;
 642                 }
 643             }
 644             if (rop->hook) {
 645                 int count;
 646                 WINDOW *w;
 647
 648                 count = (rop->line < 0) ? -rop->line : rop->line;
 649                 T(("ripping off %i lines at %s", count,
 650                    ((rop->line < 0)
 651                     ? "bottom"
 652                     : "top")));
 653
 654                 w = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
 655                                              count, scolumns,
 656                                              ((rop->line < 0)
 657                                               ? sp->_lines_avail - count
 658                                               : 0),
 659                                              0);
 660                 if (w) {
 661                     rop->win = w;
 662                     rop->hook(w, scolumns);
 663                 } else {
 664                     ReturnScreenError();
 665                 }
 666                 if (rop->line < 0) {
 667                     bottom_stolen += count;
 668                 } else {
 669                     sp->_topstolen = (NCURSES_SIZE_T) (sp->_topstolen + count);
 670                 }
 671                 sp->_lines_avail = (NCURSES_SIZE_T) (sp->_lines_avail - count);
 672             }
 673         }
 674         /* reset the stack */
 675         safe_ripoff_sp = safe_ripoff_stack;
 676     }
 677
 678     T(("creating stdscr"));
 679     assert((sp->_lines_avail + sp->_topstolen + bottom_stolen) == slines);
 680     if ((StdScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
 681                                                   sp->_lines_avail,
 682                                                   scolumns, 0, 0)) == 0) {
 683         ReturnScreenError();
 684     }
 685     SET_LINES(sp->_lines_avail);
 686 #if !USE_REENTRANT
 687     stdscr = StdScreen(sp);
 688 #endif
 689     sp->_prescreen = FALSE;
 690     returnCode(OK);
 691 }
 692
 693 #if NCURSES_SP_FUNCS
 694 NCURSES_EXPORT(int)
 695 _nc_setupscreen(int slines GCC_UNUSED,
 696                 int scolumns GCC_UNUSED,
 697                 FILE *output,
 698                 bool filtered,
 699                 int slk_format)
 700 {
 701     SCREEN *sp = 0;
 702     int rc = NCURSES_SP_NAME(_nc_setupscreen) (&sp,
 703                                                slines,
 704                                                scolumns,
 705                                                output,
 706                                                filtered,
 707                                                slk_format);
 708     if (rc != OK)
 709         _nc_set_screen(0);
 710     return rc;
 711 }
 712 #endif
 713
 714 /*
 715  * The internal implementation interprets line as the number of lines to rip
 716  * off from the top or bottom.
 717  */
 718 NCURSES_EXPORT(int)
 719 NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_DCLx
 720                                  int line,
 721                                  int (*init) (WINDOW *, int))
 722 {
 723     int code = ERR;
 724
 725     START_TRACE();
 726     T((T_CALLED("ripoffline(%p,%d,%p)"), (void *) SP_PARM, line, init));
 727
 728 #if NCURSES_SP_FUNCS
 729     if (SP_PARM != 0 && SP_PARM->_prescreen)
 730 #endif
 731     {
 732         if (line == 0) {
 733             code = OK;
 734         } else {
 735             if (safe_ripoff_sp == 0)
 736                 safe_ripoff_sp = safe_ripoff_stack;
 737             if (safe_ripoff_sp < safe_ripoff_stack + N_RIPS) {
 738                 safe_ripoff_sp->line = line;
 739                 safe_ripoff_sp->hook = init;
 740                 (safe_ripoff_sp)++;
 741                 code = OK;
 742             }
 743         }
 744     }
 745
 746     returnCode(code);
 747 }
 748
 749 #if NCURSES_SP_FUNCS
 750 NCURSES_EXPORT(int)
 751 _nc_ripoffline(int line, int (*init) (WINDOW *, int))
 752 {
 753     return NCURSES_SP_NAME(_nc_ripoffline) (CURRENT_SCREEN_PRE, line, init);
 754 }
 755 #endif
 756
 757 NCURSES_EXPORT(int)
 758 NCURSES_SP_NAME(ripoffline) (NCURSES_SP_DCLx
 759                              int line,
 760                              int (*init) (WINDOW *, int))
 761 {
 762     return NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_ARGx
 763                                             (line < 0) ? -1 : 1,
 764                                             init);
 765 }
 766
 767 #if NCURSES_SP_FUNCS
 768 NCURSES_EXPORT(int)
 769 ripoffline(int line, int (*init) (WINDOW *, int))
 770 {
 771     return NCURSES_SP_NAME(ripoffline) (CURRENT_SCREEN_PRE, line, init);
 772 }
 773 #endif