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

   1 /****************************************************************************
   2  * Copyright (c) 1998-2014,2015 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.                               *
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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 1.153 2015/08/07 23:57:58 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         NCURSES_SP_NAME(_nc_flush) (NCURSES_SP_ARG);
 192         NCURSES_SP_NAME(del_curterm) (NCURSES_SP_ARGx sp->_term);
 193         FreeIfNeeded(sp->out_buffer);
 194         free(sp);
 195
 196         /*
 197          * If this was the current screen, reset everything that the
 198          * application might try to use (except cur_term, which may have
 199          * multiple references in different screens).
 200          */
 201         if (sp == CURRENT_SCREEN) {
 202 #if !USE_REENTRANT
 203             curscr = 0;
 204             newscr = 0;
 205             stdscr = 0;
 206             COLORS = 0;
 207             COLOR_PAIRS = 0;
 208 #endif
 209             _nc_set_screen(0);
 210 #if USE_WIDEC_SUPPORT
 211             if (SP == 0) {
 212                 FreeIfNeeded(_nc_wacs);
 213                 _nc_wacs = 0;
 214             }
 215 #endif
 216         }
 217     }
 218     _nc_unlock_global(curses);
 219
 220     returnVoid;
 221 }
 222
 223 static bool
 224 no_mouse_event(SCREEN *sp GCC_UNUSED)
 225 {
 226     return FALSE;
 227 }
 228
 229 static bool
 230 no_mouse_inline(SCREEN *sp GCC_UNUSED)
 231 {
 232     return FALSE;
 233 }
 234
 235 static bool
 236 no_mouse_parse(SCREEN *sp GCC_UNUSED, int code GCC_UNUSED)
 237 {
 238     return TRUE;
 239 }
 240
 241 static void
 242 no_mouse_resume(SCREEN *sp GCC_UNUSED)
 243 {
 244 }
 245
 246 static void
 247 no_mouse_wrap(SCREEN *sp GCC_UNUSED)
 248 {
 249 }
 250
 251 #if NCURSES_EXT_FUNCS && USE_COLORFGBG
 252 static const char *
 253 extract_fgbg(const char *src, int *result)
 254 {
 255     const char *dst = 0;
 256     char *tmp = 0;
 257     long value = strtol(src, &tmp, 0);
 258
 259     if ((dst = tmp) == 0) {
 260         dst = src;
 261     } else if (value >= 0) {
 262         *result = value;
 263     }
 264     while (*dst != 0 && *dst != ';')
 265         dst++;
 266     if (*dst == ';')
 267         dst++;
 268     return dst;
 269 }
 270 #endif
 271
 272 #define ReturnScreenError() do { _nc_set_screen(0); \
 273                             returnCode(ERR); } while (0)
 274
 275 /* OS-independent screen initializations */
 276 NCURSES_EXPORT(int)
 277 NCURSES_SP_NAME(_nc_setupscreen) (
 278 #if NCURSES_SP_FUNCS
 279                                      SCREEN **spp,
 280 #endif
 281                                      int slines,
 282                                      int scolumns,
 283                                      FILE *output,
 284                                      int filtered,
 285                                      int slk_format)
 286 {
 287     char *env;
 288     int bottom_stolen = 0;
 289     ripoff_t *rop;
 290     SCREEN *sp;
 291 #ifndef USE_TERM_DRIVER
 292     bool support_cookies = USE_XMC_SUPPORT;
 293 #endif
 294
 295     T((T_CALLED("_nc_setupscreen(%d, %d, %p, %d, %d)"),
 296        slines, scolumns, (void *) output, filtered, slk_format));
 297
 298     assert(CURRENT_SCREEN == 0);        /* has been reset in newterm() ! */
 299
 300 #if NCURSES_SP_FUNCS
 301     assert(spp != 0);
 302     sp = *spp;
 303
 304     if (!sp) {
 305         sp = _nc_alloc_screen_sp();
 306         *spp = sp;
 307     }
 308     if (!sp
 309         || ((sp->_acs_map = typeCalloc(chtype, ACS_LEN)) == 0)
 310         || ((sp->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == 0)) {
 311         ReturnScreenError();
 312     }
 313
 314     T(("created SP %p", (void *) sp));
 315     sp->_next_screen = _nc_screen_chain;
 316     _nc_screen_chain = sp;
 317
 318     if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0) {
 319         ReturnScreenError();
 320     }
 321 #else
 322     if (!_nc_alloc_screen()
 323         || ((SP->_acs_map = typeCalloc(chtype, ACS_LEN)) == 0)
 324         || ((SP->_screen_acs_map = typeCalloc(bool, ACS_LEN)) == 0)) {
 325         returnCode(ERR);
 326     }
 327
 328     T(("created SP %p", (void *) SP));
 329
 330     sp = SP;                    /* fixup so SET_LINES and SET_COLS works */
 331     sp->_next_screen = _nc_screen_chain;
 332     _nc_screen_chain = sp;
 333
 334     if ((sp->_current_attr = typeCalloc(NCURSES_CH_T, 1)) == 0)
 335         returnCode(ERR);
 336 #endif
 337
 338     /*
 339      * We should always check the screensize, just in case.
 340      */
 341     _nc_set_screen(sp);
 342     sp->_term = cur_term;
 343 #ifdef USE_TERM_DRIVER
 344     TCBOf(sp)->csp = sp;
 345     _nc_get_screensize(sp, sp->_term, &slines, &scolumns);
 346 #else
 347     _nc_get_screensize(sp, &slines, &scolumns);
 348 #endif
 349     SET_LINES(slines);
 350     SET_COLS(scolumns);
 351
 352     T((T_CREATE("screen %s %dx%d"),
 353        NCURSES_SP_NAME(termname) (NCURSES_SP_ARG), slines, scolumns));
 354
 355     sp->_filtered = filtered;
 356
 357     /* implement filter mode */
 358     if (filtered) {
 359         slines = 1;
 360         SET_LINES(slines);
 361 #ifdef USE_TERM_DRIVER
 362         CallDriver(sp, td_setfilter);
 363 #else
 364         clear_screen = 0;
 365         cursor_down = parm_down_cursor = 0;
 366         cursor_address = 0;
 367         cursor_up = parm_up_cursor = 0;
 368         row_address = 0;
 369
 370         cursor_home = carriage_return;
 371 #endif
 372         T(("filter screensize %dx%d", slines, scolumns));
 373     }
 374 #ifdef __DJGPP__
 375     T(("setting output mode to binary"));
 376     fflush(output);
 377     setmode(output, O_BINARY);
 378 #endif
 379     NCURSES_SP_NAME(_nc_set_buffer) (NCURSES_SP_ARGx output, TRUE);
 380     sp->_lines = (NCURSES_SIZE_T) slines;
 381     sp->_lines_avail = (NCURSES_SIZE_T) slines;
 382     sp->_columns = (NCURSES_SIZE_T) scolumns;
 383
 384     fflush(output);
 385     sp->_ofd = output ? fileno(output) : -1;
 386     sp->_ofp = output;
 387     sp->out_limit = (size_t) ((2 + slines) * (6 + scolumns));
 388     if ((sp->out_buffer = malloc(sp->out_limit)) == 0)
 389         sp->out_limit = 0;
 390     sp->out_inuse = 0;
 391
 392     SP_PRE_INIT(sp);
 393     SetNoPadding(sp);
 394
 395 #if NCURSES_EXT_FUNCS
 396     sp->_default_color = FALSE;
 397     sp->_has_sgr_39_49 = FALSE;
 398
 399     /*
 400      * Set our assumption of the terminal's default foreground and background
 401      * colors.  The curs_color man-page states that we can assume that the
 402      * background is black.  The origin of this assumption appears to be
 403      * terminals that displayed colored text, but no colored backgrounds, e.g.,
 404      * the first colored terminals around 1980.  More recent ones with better
 405      * technology can display not only colored backgrounds, but all
 406      * combinations.  So a terminal might be something other than "white" on
 407      * black (green/black looks monochrome too), but black on white or even
 408      * on ivory.
 409      *
 410      * White-on-black is the simplest thing to use for monochrome.  Almost
 411      * all applications that use color paint both text and background, so
 412      * the distinction is moot.  But a few do not - which is why we leave this
 413      * configurable (a better solution is to use assume_default_colors() for
 414      * the rare applications that do require that sort of appearance, since
 415      * is appears that more users expect to be able to make a white-on-black
 416      * or black-on-white display under control of the application than not).
 417      */
 418 #ifdef USE_ASSUMED_COLOR
 419     sp->_default_fg = COLOR_WHITE;
 420     sp->_default_bg = COLOR_BLACK;
 421 #else
 422     sp->_default_fg = C_MASK;
 423     sp->_default_bg = C_MASK;
 424 #endif
 425
 426     /*
 427      * Allow those assumed/default color assumptions to be overridden at
 428      * runtime:
 429      */
 430     if ((env = getenv("NCURSES_ASSUMED_COLORS")) != 0) {
 431         int fg, bg;
 432         char sep1, sep2;
 433         int count = sscanf(env, "%d%c%d%c", &fg, &sep1, &bg, &sep2);
 434         if (count >= 1) {
 435             sp->_default_fg = ((fg >= 0 && fg < MaxColors) ? fg : C_MASK);
 436             if (count >= 3) {
 437                 sp->_default_bg = ((bg >= 0 && bg < MaxColors) ? bg : C_MASK);
 438             }
 439             TR(TRACE_CHARPUT | TRACE_MOVE,
 440                ("from environment assumed fg=%d, bg=%d",
 441                 sp->_default_fg,
 442                 sp->_default_bg));
 443         }
 444     }
 445 #if USE_COLORFGBG
 446     /*
 447      * If rxvt's $COLORFGBG variable is set, use it to specify the assumed
 448      * default colors.  Note that rxvt (mis)uses bold colors, equating a bold
 449      * color to that value plus 8.  We'll only use the non-bold color for now -
 450      * decide later if it is worth having default attributes as well.
 451      */
 452     if (getenv("COLORFGBG") != 0) {
 453         const char *p = getenv("COLORFGBG");
 454         TR(TRACE_CHARPUT | TRACE_MOVE, ("decoding COLORFGBG %s", p));
 455         p = extract_fgbg(p, &(sp->_default_fg));
 456         p = extract_fgbg(p, &(sp->_default_bg));
 457         if (*p)                 /* assume rxvt was compiled with xpm support */
 458             p = extract_fgbg(p, &(sp->_default_bg));
 459         TR(TRACE_CHARPUT | TRACE_MOVE, ("decoded fg=%d, bg=%d",
 460                                         sp->_default_fg, sp->_default_bg));
 461         if (sp->_default_fg >= MaxColors) {
 462             if (set_a_foreground != ABSENT_STRING
 463                 && !strcmp(set_a_foreground, "\033[3%p1%dm")) {
 464                 set_a_foreground = strdup("\033[3%?%p1%{8}%>%t9%e%p1%d%;m");
 465             } else {
 466                 sp->_default_fg %= MaxColors;
 467             }
 468         }
 469         if (sp->_default_bg >= MaxColors) {
 470             if (set_a_background != ABSENT_STRING
 471                 && !strcmp(set_a_background, "\033[4%p1%dm")) {
 472                 set_a_background = strdup("\033[4%?%p1%{8}%>%t9%e%p1%d%;m");
 473             } else {
 474                 sp->_default_bg %= MaxColors;
 475             }
 476         }
 477     }
 478 #endif
 479 #endif /* NCURSES_EXT_FUNCS */
 480
 481     sp->_maxclick = DEFAULT_MAXCLICK;
 482     sp->_mouse_event = no_mouse_event;
 483     sp->_mouse_inline = no_mouse_inline;
 484     sp->_mouse_parse = no_mouse_parse;
 485     sp->_mouse_resume = no_mouse_resume;
 486     sp->_mouse_wrap = no_mouse_wrap;
 487     sp->_mouse_fd = -1;
 488
 489     /*
 490      * If we've no magic cookie support, we suppress attributes that xmc would
 491      * affect, i.e., the attributes that affect the rendition of a space.
 492      */
 493     sp->_ok_attributes = NCURSES_SP_NAME(termattrs) (NCURSES_SP_ARG);
 494     if (NCURSES_SP_NAME(has_colors) (NCURSES_SP_ARG)) {
 495         sp->_ok_attributes |= A_COLOR;
 496     }
 497 #ifdef USE_TERM_DRIVER
 498     _nc_cookie_init(sp);
 499 #else
 500 #if USE_XMC_SUPPORT
 501     /*
 502      * If we have no magic-cookie support compiled-in, or if it is suppressed
 503      * in the environment, reset the support-flag.
 504      */
 505     if (magic_cookie_glitch >= 0) {
 506         if (getenv("NCURSES_NO_MAGIC_COOKIE") != 0) {
 507             support_cookies = FALSE;
 508         }
 509     }
 510 #endif
 511
 512     if (!support_cookies && magic_cookie_glitch >= 0) {
 513         T(("will disable attributes to work w/o magic cookies"));
 514     }
 515
 516     if (magic_cookie_glitch > 0) {      /* tvi, wyse */
 517
 518         sp->_xmc_triggers = sp->_ok_attributes & XMC_CONFLICT;
 519 #if 0
 520         /*
 521          * We "should" treat colors as an attribute.  The wyse350 (and its
 522          * clones) appear to be the only ones that have both colors and magic
 523          * cookies.
 524          */
 525         if (has_colors()) {
 526             sp->_xmc_triggers |= A_COLOR;
 527         }
 528 #endif
 529         sp->_xmc_suppress = sp->_xmc_triggers & (chtype) ~(A_BOLD);
 530
 531         T(("magic cookie attributes %s", _traceattr(sp->_xmc_suppress)));
 532         /*
 533          * Supporting line-drawing may be possible.  But make the regular
 534          * video attributes work first.
 535          */
 536         acs_chars = ABSENT_STRING;
 537         ena_acs = ABSENT_STRING;
 538         enter_alt_charset_mode = ABSENT_STRING;
 539         exit_alt_charset_mode = ABSENT_STRING;
 540 #if USE_XMC_SUPPORT
 541         /*
 542          * To keep the cookie support simple, suppress all of the optimization
 543          * hooks except for clear_screen and the cursor addressing.
 544          */
 545         if (support_cookies) {
 546             clr_eol = ABSENT_STRING;
 547             clr_eos = ABSENT_STRING;
 548             set_attributes = ABSENT_STRING;
 549         }
 550 #endif
 551     } else if (magic_cookie_glitch == 0) {      /* hpterm */
 552     }
 553
 554     /*
 555      * If magic cookies are not supported, cancel the strings that set
 556      * video attributes.
 557      */
 558     if (!support_cookies && magic_cookie_glitch >= 0) {
 559         magic_cookie_glitch = ABSENT_NUMERIC;
 560         set_attributes = ABSENT_STRING;
 561         enter_blink_mode = ABSENT_STRING;
 562         enter_bold_mode = ABSENT_STRING;
 563         enter_dim_mode = ABSENT_STRING;
 564         enter_reverse_mode = ABSENT_STRING;
 565         enter_standout_mode = ABSENT_STRING;
 566         enter_underline_mode = ABSENT_STRING;
 567     }
 568
 569     /* initialize normal acs before wide, since we use mapping in the latter */
 570 #if !USE_WIDEC_SUPPORT
 571     if (_nc_unicode_locale() && _nc_locale_breaks_acs(sp->_term)) {
 572         acs_chars = NULL;
 573         ena_acs = NULL;
 574         enter_alt_charset_mode = NULL;
 575         exit_alt_charset_mode = NULL;
 576         set_attributes = NULL;
 577     }
 578 #endif
 579 #endif
 580
 581     NCURSES_SP_NAME(_nc_init_acs) (NCURSES_SP_ARG);
 582 #if USE_WIDEC_SUPPORT
 583     sp->_screen_unicode = _nc_unicode_locale();
 584     if (_nc_wacs == 0) {
 585         _nc_init_wacs();
 586     }
 587     if (_nc_wacs == 0) {
 588         ReturnScreenError();
 589     }
 590
 591     sp->_screen_acs_fix = (sp->_screen_unicode
 592                            && _nc_locale_breaks_acs(sp->_term));
 593 #endif
 594     env = _nc_get_locale();
 595     sp->_legacy_coding = ((env == 0)
 596                           || !strcmp(env, "C")
 597                           || !strcmp(env, "POSIX"));
 598     T(("legacy-coding %d", sp->_legacy_coding));
 599
 600     sp->_nc_sp_idcok = TRUE;
 601     sp->_nc_sp_idlok = FALSE;
 602
 603     sp->oldhash = 0;
 604     sp->newhash = 0;
 605
 606     T(("creating newscr"));
 607     NewScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
 608                                              0, 0);
 609     if (NewScreen(sp) == 0) {
 610         ReturnScreenError();
 611     }
 612     T(("creating curscr"));
 613     CurScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx slines, scolumns,
 614                                              0, 0);
 615     if (CurScreen(sp) == 0) {
 616         ReturnScreenError();
 617     }
 618 #if !USE_REENTRANT
 619     newscr = NewScreen(sp);
 620     curscr = CurScreen(sp);
 621 #endif
 622 #if USE_SIZECHANGE
 623     sp->_resize = NCURSES_SP_NAME(resizeterm);
 624     sp->_ungetch = safe_ungetch;
 625 #endif
 626
 627     NewScreen(sp)->_clear = TRUE;
 628     CurScreen(sp)->_clear = FALSE;
 629
 630     NCURSES_SP_NAME(def_shell_mode) (NCURSES_SP_ARG);
 631     NCURSES_SP_NAME(def_prog_mode) (NCURSES_SP_ARG);
 632
 633     if (safe_ripoff_sp && safe_ripoff_sp != safe_ripoff_stack) {
 634         for (rop = safe_ripoff_stack;
 635              rop != safe_ripoff_sp && (rop - safe_ripoff_stack) < N_RIPS;
 636              rop++) {
 637
 638             /* If we must simulate soft labels, grab off the line to be used.
 639                We assume that we must simulate, if it is none of the standard
 640                formats (4-4 or 3-2-3) for which there may be some hardware
 641                support. */
 642             if (rop->hook == _nc_slk_initialize) {
 643                 if (!(NumLabels <= 0 || !SLK_STDFMT(slk_format))) {
 644                     continue;
 645                 }
 646             }
 647             if (rop->hook) {
 648                 int count;
 649                 WINDOW *w;
 650
 651                 count = (rop->line < 0) ? -rop->line : rop->line;
 652                 T(("ripping off %i lines at %s", count,
 653                    ((rop->line < 0)
 654                     ? "bottom"
 655                     : "top")));
 656
 657                 w = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
 658                                              count, scolumns,
 659                                              ((rop->line < 0)
 660                                               ? sp->_lines_avail - count
 661                                               : 0),
 662                                              0);
 663                 if (w) {
 664                     rop->win = w;
 665                     rop->hook(w, scolumns);
 666                 } else {
 667                     ReturnScreenError();
 668                 }
 669                 if (rop->line < 0) {
 670                     bottom_stolen += count;
 671                 } else {
 672                     sp->_topstolen = (NCURSES_SIZE_T) (sp->_topstolen + count);
 673                 }
 674                 sp->_lines_avail = (NCURSES_SIZE_T) (sp->_lines_avail - count);
 675             }
 676         }
 677         /* reset the stack */
 678         safe_ripoff_sp = safe_ripoff_stack;
 679     }
 680
 681     T(("creating stdscr"));
 682     assert((sp->_lines_avail + sp->_topstolen + bottom_stolen) == slines);
 683     if ((StdScreen(sp) = NCURSES_SP_NAME(newwin) (NCURSES_SP_ARGx
 684                                                   sp->_lines_avail,
 685                                                   scolumns, 0, 0)) == 0) {
 686         ReturnScreenError();
 687     }
 688     SET_LINES(sp->_lines_avail);
 689 #if !USE_REENTRANT
 690     stdscr = StdScreen(sp);
 691 #endif
 692     sp->_prescreen = FALSE;
 693     returnCode(OK);
 694 }
 695
 696 #if NCURSES_SP_FUNCS
 697 NCURSES_EXPORT(int)
 698 _nc_setupscreen(int slines GCC_UNUSED,
 699                 int scolumns GCC_UNUSED,
 700                 FILE *output,
 701                 int filtered,
 702                 int slk_format)
 703 {
 704     SCREEN *sp = 0;
 705     int rc = NCURSES_SP_NAME(_nc_setupscreen) (&sp,
 706                                                slines,
 707                                                scolumns,
 708                                                output,
 709                                                filtered,
 710                                                slk_format);
 711     if (rc != OK)
 712         _nc_set_screen(0);
 713     return rc;
 714 }
 715 #endif
 716
 717 /*
 718  * The internal implementation interprets line as the number of lines to rip
 719  * off from the top or bottom.
 720  */
 721 NCURSES_EXPORT(int)
 722 NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_DCLx
 723                                  int line,
 724                                  int (*init) (WINDOW *, int))
 725 {
 726     int code = ERR;
 727
 728     START_TRACE();
 729     T((T_CALLED("ripoffline(%p,%d,%p)"), (void *) SP_PARM, line, init));
 730
 731 #if NCURSES_SP_FUNCS
 732     if (SP_PARM != 0 && SP_PARM->_prescreen)
 733 #endif
 734     {
 735         if (line == 0) {
 736             code = OK;
 737         } else {
 738             if (safe_ripoff_sp == 0)
 739                 safe_ripoff_sp = safe_ripoff_stack;
 740             if (safe_ripoff_sp < safe_ripoff_stack + N_RIPS) {
 741                 safe_ripoff_sp->line = line;
 742                 safe_ripoff_sp->hook = init;
 743                 (safe_ripoff_sp)++;
 744                 code = OK;
 745             }
 746         }
 747     }
 748
 749     returnCode(code);
 750 }
 751
 752 #if NCURSES_SP_FUNCS
 753 NCURSES_EXPORT(int)
 754 _nc_ripoffline(int line, int (*init) (WINDOW *, int))
 755 {
 756     return NCURSES_SP_NAME(_nc_ripoffline) (CURRENT_SCREEN_PRE, line, init);
 757 }
 758 #endif
 759
 760 NCURSES_EXPORT(int)
 761 NCURSES_SP_NAME(ripoffline) (NCURSES_SP_DCLx
 762                              int line,
 763                              int (*init) (WINDOW *, int))
 764 {
 765     START_TRACE();
 766     return NCURSES_SP_NAME(_nc_ripoffline) (NCURSES_SP_ARGx
 767                                             (line < 0) ? -1 : 1,
 768                                             init);
 769 }
 770
 771 #if NCURSES_SP_FUNCS
 772 NCURSES_EXPORT(int)
 773 ripoffline(int line, int (*init) (WINDOW *, int))
 774 {
 775     return NCURSES_SP_NAME(ripoffline) (CURRENT_SCREEN_PRE, line, init);
 776 }
 777 #endif