release/src/router/libncurses/ncurses/tinfo/lib_tparm.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2014,2015 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   *
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  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  ****************************************************************************/
  34
  35 /*
  36  *      tparm.c
  37  *
  38  */
  39
  40 #include <curses.priv.h>
  41
  42 #include <ctype.h>
  43 #include <tic.h>
  44
  45 MODULE_ID("$Id: lib_tparm.c,v 1.94 2015/07/17 01:03:35 tom Exp $")
  46
  47 /*
  48  *      char *
  49  *      tparm(string, ...)
  50  *
  51  *      Substitute the given parameters into the given string by the following
  52  *      rules (taken from terminfo(5)):
  53  *
  54  *           Cursor addressing and other strings  requiring  parame-
  55  *      ters in the terminal are described by a parameterized string
  56  *      capability, with escapes like %x in  it.   For  example,  to
  57  *      address  the  cursor, the cup capability is given, using two
  58  *      parameters: the row and column to  address  to.   (Rows  and
  59  *      columns  are  numbered  from  zero and refer to the physical
  60  *      screen visible to the user, not to any  unseen  memory.)  If
  61  *      the terminal has memory relative cursor addressing, that can
  62  *      be indicated by
  63  *
  64  *           The parameter mechanism uses  a  stack  and  special  %
  65  *      codes  to manipulate it.  Typically a sequence will push one
  66  *      of the parameters onto the stack and then print it  in  some
  67  *      format.  Often more complex operations are necessary.
  68  *
  69  *           The % encodings have the following meanings:
  70  *
  71  *           %%        outputs `%'
  72  *           %c        print pop() like %c in printf()
  73  *           %s        print pop() like %s in printf()
  74  *           %[[:]flags][width[.precision]][doxXs]
  75  *                     as in printf, flags are [-+#] and space
  76  *                     The ':' is used to avoid making %+ or %-
  77  *                     patterns (see below).
  78  *
  79  *           %p[1-9]   push ith parm
  80  *           %P[a-z]   set dynamic variable [a-z] to pop()
  81  *           %g[a-z]   get dynamic variable [a-z] and push it
  82  *           %P[A-Z]   set static variable [A-Z] to pop()
  83  *           %g[A-Z]   get static variable [A-Z] and push it
  84  *           %l        push strlen(pop)
  85  *           %'c'      push char constant c
  86  *           %{nn}     push integer constant nn
  87  *
  88  *           %+ %- %* %/ %m
  89  *                     arithmetic (%m is mod): push(pop() op pop())
  90  *           %& %| %^  bit operations: push(pop() op pop())
  91  *           %= %> %<  logical operations: push(pop() op pop())
  92  *           %A %O     logical and & or operations for conditionals
  93  *           %! %~     unary operations push(op pop())
  94  *           %i        add 1 to first two parms (for ANSI terminals)
  95  *
  96  *           %? expr %t thenpart %e elsepart %;
  97  *                     if-then-else, %e elsepart is optional.
  98  *                     else-if's are possible ala Algol 68:
  99  *                     %? c1 %t b1 %e c2 %t b2 %e c3 %t b3 %e c4 %t b4 %e b5 %;
 100  *
 101  *      For those of the above operators which are binary and not commutative,
 102  *      the stack works in the usual way, with
 103  *                      %gx %gy %m
 104  *      resulting in x mod y, not the reverse.
 105  */
 106
 107 NCURSES_EXPORT_VAR(int) _nc_tparm_err = 0;
 108
 109 #define TPS(var) _nc_prescreen.tparm_state.var
 110 #define popcount _nc_popcount   /* workaround for NetBSD 6.0 defect */
 111
 112 #if NO_LEAKS
 113 NCURSES_EXPORT(void)
 114 _nc_free_tparm(void)
 115 {
 116     if (TPS(out_buff) != 0) {
 117         FreeAndNull(TPS(out_buff));
 118         TPS(out_size) = 0;
 119         TPS(out_used) = 0;
 120         FreeAndNull(TPS(fmt_buff));
 121         TPS(fmt_size) = 0;
 122     }
 123 }
 124 #endif
 125
 126 static NCURSES_INLINE void
 127 get_space(size_t need)
 128 {
 129     need += TPS(out_used);
 130     if (need > TPS(out_size)) {
 131         TPS(out_size) = need * 2;
 132         TYPE_REALLOC(char, TPS(out_size), TPS(out_buff));
 133     }
 134 }
 135
 136 static NCURSES_INLINE void
 137 save_text(const char *fmt, const char *s, int len)
 138 {
 139     size_t s_len = strlen(s);
 140     if (len > (int) s_len)
 141         s_len = (size_t) len;
 142
 143     get_space(s_len + 1);
 144
 145     _nc_SPRINTF(TPS(out_buff) + TPS(out_used),
 146                 _nc_SLIMIT(TPS(out_size) - TPS(out_used))
 147                 fmt, s);
 148     TPS(out_used) += strlen(TPS(out_buff) + TPS(out_used));
 149 }
 150
 151 static NCURSES_INLINE void
 152 save_number(const char *fmt, int number, int len)
 153 {
 154     if (len < 30)
 155         len = 30;               /* actually log10(MAX_INT)+1 */
 156
 157     get_space((size_t) len + 1);
 158
 159     _nc_SPRINTF(TPS(out_buff) + TPS(out_used),
 160                 _nc_SLIMIT(TPS(out_size) - TPS(out_used))
 161                 fmt, number);
 162     TPS(out_used) += strlen(TPS(out_buff) + TPS(out_used));
 163 }
 164
 165 static NCURSES_INLINE void
 166 save_char(int c)
 167 {
 168     if (c == 0)
 169         c = 0200;
 170     get_space((size_t) 1);
 171     TPS(out_buff)[TPS(out_used)++] = (char) c;
 172 }
 173
 174 static NCURSES_INLINE void
 175 npush(int x)
 176 {
 177     if (TPS(stack_ptr) < STACKSIZE) {
 178         TPS(stack)[TPS(stack_ptr)].num_type = TRUE;
 179         TPS(stack)[TPS(stack_ptr)].data.num = x;
 180         TPS(stack_ptr)++;
 181     } else {
 182         DEBUG(2, ("npush: stack overflow: %s", _nc_visbuf(TPS(tparam_base))));
 183         _nc_tparm_err++;
 184     }
 185 }
 186
 187 static NCURSES_INLINE int
 188 npop(void)
 189 {
 190     int result = 0;
 191     if (TPS(stack_ptr) > 0) {
 192         TPS(stack_ptr)--;
 193         if (TPS(stack)[TPS(stack_ptr)].num_type)
 194             result = TPS(stack)[TPS(stack_ptr)].data.num;
 195     } else {
 196         DEBUG(2, ("npop: stack underflow: %s", _nc_visbuf(TPS(tparam_base))));
 197         _nc_tparm_err++;
 198     }
 199     return result;
 200 }
 201
 202 static NCURSES_INLINE void
 203 spush(char *x)
 204 {
 205     if (TPS(stack_ptr) < STACKSIZE) {
 206         TPS(stack)[TPS(stack_ptr)].num_type = FALSE;
 207         TPS(stack)[TPS(stack_ptr)].data.str = x;
 208         TPS(stack_ptr)++;
 209     } else {
 210         DEBUG(2, ("spush: stack overflow: %s", _nc_visbuf(TPS(tparam_base))));
 211         _nc_tparm_err++;
 212     }
 213 }
 214
 215 static NCURSES_INLINE char *
 216 spop(void)
 217 {
 218     static char dummy[] = "";   /* avoid const-cast */
 219     char *result = dummy;
 220     if (TPS(stack_ptr) > 0) {
 221         TPS(stack_ptr)--;
 222         if (!TPS(stack)[TPS(stack_ptr)].num_type
 223             && TPS(stack)[TPS(stack_ptr)].data.str != 0)
 224             result = TPS(stack)[TPS(stack_ptr)].data.str;
 225     } else {
 226         DEBUG(2, ("spop: stack underflow: %s", _nc_visbuf(TPS(tparam_base))));
 227         _nc_tparm_err++;
 228     }
 229     return result;
 230 }
 231
 232 static NCURSES_INLINE const char *
 233 parse_format(const char *s, char *format, int *len)
 234 {
 235     *len = 0;
 236     if (format != 0) {
 237         bool done = FALSE;
 238         bool allowminus = FALSE;
 239         bool dot = FALSE;
 240         bool err = FALSE;
 241         char *fmt = format;
 242         int my_width = 0;
 243         int my_prec = 0;
 244         int value = 0;
 245
 246         *len = 0;
 247         *format++ = '%';
 248         while (*s != '\0' && !done) {
 249             switch (*s) {
 250             case 'c':           /* FALLTHRU */
 251             case 'd':           /* FALLTHRU */
 252             case 'o':           /* FALLTHRU */
 253             case 'x':           /* FALLTHRU */
 254             case 'X':           /* FALLTHRU */
 255             case 's':
 256 #ifdef EXP_XTERM_1005
 257             case 'u':
 258 #endif
 259                 *format++ = *s;
 260                 done = TRUE;
 261                 break;
 262             case '.':
 263                 *format++ = *s++;
 264                 if (dot) {
 265                     err = TRUE;
 266                 } else {        /* value before '.' is the width */
 267                     dot = TRUE;
 268                     my_width = value;
 269                 }
 270                 value = 0;
 271                 break;
 272             case '#':
 273                 *format++ = *s++;
 274                 break;
 275             case ' ':
 276                 *format++ = *s++;
 277                 break;
 278             case ':':
 279                 s++;
 280                 allowminus = TRUE;
 281                 break;
 282             case '-':
 283                 if (allowminus) {
 284                     *format++ = *s++;
 285                 } else {
 286                     done = TRUE;
 287                 }
 288                 break;
 289             default:
 290                 if (isdigit(UChar(*s))) {
 291                     value = (value * 10) + (*s - '0');
 292                     if (value > 10000)
 293                         err = TRUE;
 294                     *format++ = *s++;
 295                 } else {
 296                     done = TRUE;
 297                 }
 298             }
 299         }
 300
 301         /*
 302          * If we found an error, ignore (and remove) the flags.
 303          */
 304         if (err) {
 305             my_width = my_prec = value = 0;
 306             format = fmt;
 307             *format++ = '%';
 308             *format++ = *s;
 309         }
 310
 311         /*
 312          * Any value after '.' is the precision.  If we did not see '.', then
 313          * the value is the width.
 314          */
 315         if (dot)
 316             my_prec = value;
 317         else
 318             my_width = value;
 319
 320         *format = '\0';
 321         /* return maximum string length in print */
 322         *len = (my_width > my_prec) ? my_width : my_prec;
 323     }
 324     return s;
 325 }
 326
 327 #define isUPPER(c) ((c) >= 'A' && (c) <= 'Z')
 328 #define isLOWER(c) ((c) >= 'a' && (c) <= 'z')
 329
 330 /*
 331  * Analyze the string to see how many parameters we need from the varargs list,
 332  * and what their types are.  We will only accept string parameters if they
 333  * appear as a %l or %s format following an explicit parameter reference (e.g.,
 334  * %p2%s).  All other parameters are numbers.
 335  *
 336  * 'number' counts coarsely the number of pop's we see in the string, and
 337  * 'popcount' shows the highest parameter number in the string.  We would like
 338  * to simply use the latter count, but if we are reading termcap strings, there
 339  * may be cases that we cannot see the explicit parameter numbers.
 340  */
 341 NCURSES_EXPORT(int)
 342 _nc_tparm_analyze(const char *string, char *p_is_s[NUM_PARM], int *popcount)
 343 {
 344     size_t len2;
 345     int i;
 346     int lastpop = -1;
 347     int len;
 348     int number = 0;
 349     const char *cp = string;
 350     static char dummy[] = "";
 351
 352     if (cp == 0)
 353         return 0;
 354
 355     if ((len2 = strlen(cp)) > TPS(fmt_size)) {
 356         TPS(fmt_size) = len2 + TPS(fmt_size) + 2;
 357         TPS(fmt_buff) = typeRealloc(char, TPS(fmt_size), TPS(fmt_buff));
 358         if (TPS(fmt_buff) == 0)
 359             return 0;
 360     }
 361
 362     memset(p_is_s, 0, sizeof(p_is_s[0]) * NUM_PARM);
 363     *popcount = 0;
 364
 365     while ((cp - string) < (int) len2) {
 366         if (*cp == '%') {
 367             cp++;
 368             cp = parse_format(cp, TPS(fmt_buff), &len);
 369             switch (*cp) {
 370             default:
 371                 break;
 372
 373             case 'd':           /* FALLTHRU */
 374             case 'o':           /* FALLTHRU */
 375             case 'x':           /* FALLTHRU */
 376             case 'X':           /* FALLTHRU */
 377             case 'c':           /* FALLTHRU */
 378 #ifdef EXP_XTERM_1005
 379             case 'u':
 380 #endif
 381                 if (lastpop <= 0)
 382                     number++;
 383                 lastpop = -1;
 384                 break;
 385
 386             case 'l':
 387             case 's':
 388                 if (lastpop > 0)
 389                     p_is_s[lastpop - 1] = dummy;
 390                 ++number;
 391                 break;
 392
 393             case 'p':
 394                 cp++;
 395                 i = (UChar(*cp) - '0');
 396                 if (i >= 0 && i <= NUM_PARM) {
 397                     lastpop = i;
 398                     if (lastpop > *popcount)
 399                         *popcount = lastpop;
 400                 }
 401                 break;
 402
 403             case 'P':
 404                 ++number;
 405                 ++cp;
 406                 break;
 407
 408             case 'g':
 409                 cp++;
 410                 break;
 411
 412             case S_QUOTE:
 413                 cp += 2;
 414                 lastpop = -1;
 415                 break;
 416
 417             case L_BRACE:
 418                 cp++;
 419                 while (isdigit(UChar(*cp))) {
 420                     cp++;
 421                 }
 422                 break;
 423
 424             case '+':
 425             case '-':
 426             case '*':
 427             case '/':
 428             case 'm':
 429             case 'A':
 430             case 'O':
 431             case '&':
 432             case '|':
 433             case '^':
 434             case '=':
 435             case '<':
 436             case '>':
 437                 lastpop = -1;
 438                 number += 2;
 439                 break;
 440
 441             case '!':
 442             case '~':
 443                 lastpop = -1;
 444                 ++number;
 445                 break;
 446
 447             case 'i':
 448                 /* will add 1 to first (usually two) parameters */
 449                 break;
 450             }
 451         }
 452         if (*cp != '\0')
 453             cp++;
 454     }
 455
 456     if (number > NUM_PARM)
 457         number = NUM_PARM;
 458     return number;
 459 }
 460
 461 static NCURSES_INLINE char *
 462 tparam_internal(int use_TPARM_ARG, const char *string, va_list ap)
 463 {
 464     char *p_is_s[NUM_PARM];
 465     TPARM_ARG param[NUM_PARM];
 466     int popcount = 0;
 467     int number;
 468     int num_args;
 469     int len;
 470     int level;
 471     int x, y;
 472     int i;
 473     const char *cp = string;
 474     size_t len2;
 475     bool termcap_hack;
 476     bool incremented_two;
 477
 478     if (cp == NULL)
 479         return NULL;
 480
 481     TPS(out_used) = 0;
 482     len2 = strlen(cp);
 483
 484     /*
 485      * Find the highest parameter-number referred to in the format string.
 486      * Use this value to limit the number of arguments copied from the
 487      * variable-length argument list.
 488      */
 489     number = _nc_tparm_analyze(cp, p_is_s, &popcount);
 490     if (TPS(fmt_buff) == 0)
 491         return NULL;
 492
 493     incremented_two = FALSE;
 494
 495     if (number > NUM_PARM)
 496         number = NUM_PARM;
 497     if (popcount > NUM_PARM)
 498         popcount = NUM_PARM;
 499     num_args = max(popcount, number);
 500
 501     for (i = 0; i < num_args; i++) {
 502         /*
 503          * A few caps (such as plab_norm) have string-valued parms.
 504          * We'll have to assume that the caller knows the difference, since
 505          * a char* and an int may not be the same size on the stack.  The
 506          * normal prototype for this uses 9 long's, which is consistent with
 507          * our va_arg() usage.
 508          */
 509         if (p_is_s[i] != 0) {
 510             p_is_s[i] = va_arg(ap, char *);
 511             param[i] = 0;
 512         } else if (use_TPARM_ARG) {
 513             param[i] = va_arg(ap, TPARM_ARG);
 514         } else {
 515             param[i] = (TPARM_ARG) va_arg(ap, int);
 516         }
 517     }
 518
 519     /*
 520      * This is a termcap compatibility hack.  If there are no explicit pop
 521      * operations in the string, load the stack in such a way that
 522      * successive pops will grab successive parameters.  That will make
 523      * the expansion of (for example) \E[%d;%dH work correctly in termcap
 524      * style, which means tparam() will expand termcap strings OK.
 525      */
 526     TPS(stack_ptr) = 0;
 527     termcap_hack = FALSE;
 528     if (popcount == 0) {
 529         termcap_hack = TRUE;
 530         popcount = number;
 531         for (i = number - 1; i >= 0; i--) {
 532             if (p_is_s[i])
 533                 spush(p_is_s[i]);
 534             else
 535                 npush((int) param[i]);
 536         }
 537     }
 538 #ifdef TRACE
 539     if (USE_TRACEF(TRACE_CALLS)) {
 540         for (i = 0; i < num_args; i++) {
 541             if (p_is_s[i] != 0)
 542                 save_text(", %s", _nc_visbuf(p_is_s[i]), 0);
 543             else
 544                 save_number(", %d", (int) param[i], 0);
 545         }
 546         _tracef(T_CALLED("%s(%s%s)"), TPS(tname), _nc_visbuf(cp), TPS(out_buff));
 547         TPS(out_used) = 0;
 548         _nc_unlock_global(tracef);
 549     }
 550 #endif /* TRACE */
 551
 552     while ((cp - string) < (int) len2) {
 553         if (*cp != '%') {
 554             save_char(UChar(*cp));
 555         } else {
 556             TPS(tparam_base) = cp++;
 557             cp = parse_format(cp, TPS(fmt_buff), &len);
 558             switch (*cp) {
 559             default:
 560                 break;
 561             case '%':
 562                 save_char('%');
 563                 break;
 564
 565             case 'd':           /* FALLTHRU */
 566             case 'o':           /* FALLTHRU */
 567             case 'x':           /* FALLTHRU */
 568             case 'X':           /* FALLTHRU */
 569                 save_number(TPS(fmt_buff), npop(), len);
 570                 break;
 571
 572             case 'c':           /* FALLTHRU */
 573                 save_char(npop());
 574                 break;
 575
 576 #ifdef EXP_XTERM_1005
 577             case 'u':
 578                 {
 579                     unsigned char target[10];
 580                     unsigned source = (unsigned) npop();
 581                     int rc = _nc_conv_to_utf8(target, source, (unsigned)
 582                                               sizeof(target));
 583                     int n;
 584                     for (n = 0; n < rc; ++n) {
 585                         save_char(target[n]);
 586                     }
 587                 }
 588                 break;
 589 #endif
 590             case 'l':
 591                 npush((int) strlen(spop()));
 592                 break;
 593
 594             case 's':
 595                 save_text(TPS(fmt_buff), spop(), len);
 596                 break;
 597
 598             case 'p':
 599                 cp++;
 600                 i = (UChar(*cp) - '1');
 601                 if (i >= 0 && i < NUM_PARM) {
 602                     if (p_is_s[i]) {
 603                         spush(p_is_s[i]);
 604                     } else {
 605                         npush((int) param[i]);
 606                     }
 607                 }
 608                 break;
 609
 610             case 'P':
 611                 cp++;
 612                 if (isUPPER(*cp)) {
 613                     i = (UChar(*cp) - 'A');
 614                     TPS(static_vars)[i] = npop();
 615                 } else if (isLOWER(*cp)) {
 616                     i = (UChar(*cp) - 'a');
 617                     TPS(dynamic_var)[i] = npop();
 618                 }
 619                 break;
 620
 621             case 'g':
 622                 cp++;
 623                 if (isUPPER(*cp)) {
 624                     i = (UChar(*cp) - 'A');
 625                     npush(TPS(static_vars)[i]);
 626                 } else if (isLOWER(*cp)) {
 627                     i = (UChar(*cp) - 'a');
 628                     npush(TPS(dynamic_var)[i]);
 629                 }
 630                 break;
 631
 632             case S_QUOTE:
 633                 cp++;
 634                 npush(UChar(*cp));
 635                 cp++;
 636                 break;
 637
 638             case L_BRACE:
 639                 number = 0;
 640                 cp++;
 641                 while (isdigit(UChar(*cp))) {
 642                     number = (number * 10) + (UChar(*cp) - '0');
 643                     cp++;
 644                 }
 645                 npush(number);
 646                 break;
 647
 648             case '+':
 649                 npush(npop() + npop());
 650                 break;
 651
 652             case '-':
 653                 y = npop();
 654                 x = npop();
 655                 npush(x - y);
 656                 break;
 657
 658             case '*':
 659                 npush(npop() * npop());
 660                 break;
 661
 662             case '/':
 663                 y = npop();
 664                 x = npop();
 665                 npush(y ? (x / y) : 0);
 666                 break;
 667
 668             case 'm':
 669                 y = npop();
 670                 x = npop();
 671                 npush(y ? (x % y) : 0);
 672                 break;
 673
 674             case 'A':
 675                 y = npop();
 676                 x = npop();
 677                 npush(y && x);
 678                 break;
 679
 680             case 'O':
 681                 y = npop();
 682                 x = npop();
 683                 npush(y || x);
 684                 break;
 685
 686             case '&':
 687                 npush(npop() & npop());
 688                 break;
 689
 690             case '|':
 691                 npush(npop() | npop());
 692                 break;
 693
 694             case '^':
 695                 npush(npop() ^ npop());
 696                 break;
 697
 698             case '=':
 699                 y = npop();
 700                 x = npop();
 701                 npush(x == y);
 702                 break;
 703
 704             case '<':
 705                 y = npop();
 706                 x = npop();
 707                 npush(x < y);
 708                 break;
 709
 710             case '>':
 711                 y = npop();
 712                 x = npop();
 713                 npush(x > y);
 714                 break;
 715
 716             case '!':
 717                 npush(!npop());
 718                 break;
 719
 720             case '~':
 721                 npush(~npop());
 722                 break;
 723
 724             case 'i':
 725                 /*
 726                  * Increment the first two parameters -- if they are numbers
 727                  * rather than strings.  As a side effect, assign into the
 728                  * stack; if this is termcap, then the stack was populated
 729                  * using the termcap hack above rather than via the terminfo
 730                  * 'p' case.
 731                  */
 732                 if (!incremented_two) {
 733                     incremented_two = TRUE;
 734                     if (p_is_s[0] == 0) {
 735                         param[0]++;
 736                         if (termcap_hack)
 737                             TPS(stack)[0].data.num = (int) param[0];
 738                     }
 739                     if (p_is_s[1] == 0) {
 740                         param[1]++;
 741                         if (termcap_hack)
 742                             TPS(stack)[1].data.num = (int) param[1];
 743                     }
 744                 }
 745                 break;
 746
 747             case '?':
 748                 break;
 749
 750             case 't':
 751                 x = npop();
 752                 if (!x) {
 753                     /* scan forward for %e or %; at level zero */
 754                     cp++;
 755                     level = 0;
 756                     while (*cp) {
 757                         if (*cp == '%') {
 758                             cp++;
 759                             if (*cp == '?')
 760                                 level++;
 761                             else if (*cp == ';') {
 762                                 if (level > 0)
 763                                     level--;
 764                                 else
 765                                     break;
 766                             } else if (*cp == 'e' && level == 0)
 767                                 break;
 768                         }
 769
 770                         if (*cp)
 771                             cp++;
 772                     }
 773                 }
 774                 break;
 775
 776             case 'e':
 777                 /* scan forward for a %; at level zero */
 778                 cp++;
 779                 level = 0;
 780                 while (*cp) {
 781                     if (*cp == '%') {
 782                         cp++;
 783                         if (*cp == '?')
 784                             level++;
 785                         else if (*cp == ';') {
 786                             if (level > 0)
 787                                 level--;
 788                             else
 789                                 break;
 790                         }
 791                     }
 792
 793                     if (*cp)
 794                         cp++;
 795                 }
 796                 break;
 797
 798             case ';':
 799                 break;
 800
 801             }                   /* endswitch (*cp) */
 802         }                       /* endelse (*cp == '%') */
 803
 804         if (*cp == '\0')
 805             break;
 806
 807         cp++;
 808     }                           /* endwhile (*cp) */
 809
 810     get_space((size_t) 1);
 811     TPS(out_buff)[TPS(out_used)] = '\0';
 812
 813     T((T_RETURN("%s"), _nc_visbuf(TPS(out_buff))));
 814     return (TPS(out_buff));
 815 }
 816
 817 #if NCURSES_TPARM_VARARGS
 818 #define tparm_varargs tparm
 819 #else
 820 #define tparm_proto tparm
 821 #endif
 822
 823 NCURSES_EXPORT(char *)
 824 tparm_varargs(NCURSES_CONST char *string,...)
 825 {
 826     va_list ap;
 827     char *result;
 828
 829     _nc_tparm_err = 0;
 830     va_start(ap, string);
 831 #ifdef TRACE
 832     TPS(tname) = "tparm";
 833 #endif /* TRACE */
 834     result = tparam_internal(TRUE, string, ap);
 835     va_end(ap);
 836     return result;
 837 }
 838
 839 #if !NCURSES_TPARM_VARARGS
 840 NCURSES_EXPORT(char *)
 841 tparm_proto(NCURSES_CONST char *string,
 842             TPARM_ARG a1,
 843             TPARM_ARG a2,
 844             TPARM_ARG a3,
 845             TPARM_ARG a4,
 846             TPARM_ARG a5,
 847             TPARM_ARG a6,
 848             TPARM_ARG a7,
 849             TPARM_ARG a8,
 850             TPARM_ARG a9)
 851 {
 852     return tparm_varargs(string, a1, a2, a3, a4, a5, a6, a7, a8, a9);
 853 }
 854 #endif /* NCURSES_TPARM_VARARGS */
 855
 856 NCURSES_EXPORT(char *)
 857 tiparm(const char *string,...)
 858 {
 859     va_list ap;
 860     char *result;
 861
 862     _nc_tparm_err = 0;
 863     va_start(ap, string);
 864 #ifdef TRACE
 865     TPS(tname) = "tiparm";
 866 #endif /* TRACE */
 867     result = tparam_internal(FALSE, string, ap);
 868     va_end(ap);
 869     return result;
 870 }