xdr_rec.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29
  30 /*
  31  * xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking"
  32  * layer above tcp (for rpc's use).
  33  *
  34  * Copyright (C) 1984, Sun Microsystems, Inc.
  35  *
  36  * These routines interface XDRSTREAMS to a tcp/ip connection.
  37  * There is a record marking layer between the xdr stream
  38  * and the tcp transport level.  A record is composed on one or more
  39  * record fragments.  A record fragment is a thirty-two bit header followed
  40  * by n bytes of data, where n is contained in the header.  The header
  41  * is represented as a htonl(u_long).  The high order bit encodes
  42  * whether or not the fragment is the last fragment of the record
  43  * (1 => fragment is last, 0 => more fragments to follow.
  44  * The other 31 bits encode the byte length of the fragment.
  45  */
  46
  47 #define __FORCE_GLIBC
  48 #include <features.h>
  49
  50
  51 #include <stdio.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <rpc/rpc.h>
  55
  56 #ifdef USE_IN_LIBIO
  57 # include <wchar.h>
  58 # include <libio/iolibio.h>
  59 # define fputs(s, f) _IO_fputs (s, f)
  60 #endif
  61
  62
  63 static bool_t xdrrec_getbytes (XDR *, caddr_t, u_int);
  64 static bool_t xdrrec_putbytes (XDR *, const char *, u_int);
  65 static bool_t xdrrec_getint32 (XDR *, int32_t *);
  66 static bool_t xdrrec_putint32 (XDR *, const int32_t *);
  67 #if ULONG_MAX != 0xffffffff
  68 static bool_t xdrrec_getlong (XDR *, long *);
  69 static bool_t xdrrec_putlong (XDR *, const long *);
  70 #endif
  71 static u_int xdrrec_getpos (const XDR *);
  72 static bool_t xdrrec_setpos (XDR *, u_int);
  73 static int32_t *xdrrec_inline (XDR *, u_int);
  74 static void xdrrec_destroy (XDR *);
  75
  76 static const struct xdr_ops xdrrec_ops = {
  77 #if ULONG_MAX == 0xffffffff
  78   (bool_t (*)(XDR *, long *)) xdrrec_getint32,
  79   (bool_t (*)(XDR *, const long *)) xdrrec_putint32,
  80 #else
  81   xdrrec_getlong,
  82   xdrrec_putlong,
  83 #endif
  84   xdrrec_getbytes,
  85   xdrrec_putbytes,
  86   xdrrec_getpos,
  87   xdrrec_setpos,
  88   xdrrec_inline,
  89   xdrrec_destroy,
  90   xdrrec_getint32,
  91   xdrrec_putint32
  92 };
  93
  94 /*
  95  * A record is composed of one or more record fragments.
  96  * A record fragment is a two-byte header followed by zero to
  97  * 2**32-1 bytes.  The header is treated as a long unsigned and is
  98  * encode/decoded to the network via htonl/ntohl.  The low order 31 bits
  99  * are a byte count of the fragment.  The highest order bit is a boolean:
 100  * 1 => this fragment is the last fragment of the record,
 101  * 0 => this fragment is followed by more fragment(s).
 102  *
 103  * The fragment/record machinery is not general;  it is constructed to
 104  * meet the needs of xdr and rpc based on tcp.
 105  */
 106
 107 #define LAST_FRAG (1UL << 31)
 108
 109 typedef struct rec_strm
 110   {
 111     caddr_t tcp_handle;
 112     caddr_t the_buffer;
 113     /*
 114      * out-going bits
 115      */
 116     int (*writeit) (char *, char *, int);
 117     caddr_t out_base;           /* output buffer (points to frag header) */
 118     caddr_t out_finger;         /* next output position */
 119     caddr_t out_boundry;        /* data cannot up to this address */
 120     u_int32_t *frag_header;     /* beginning of curren fragment */
 121     bool_t frag_sent;           /* true if buffer sent in middle of record */
 122     /*
 123      * in-coming bits
 124      */
 125     int (*readit) (char *, char *, int);
 126     u_long in_size;             /* fixed size of the input buffer */
 127     caddr_t in_base;
 128     caddr_t in_finger;          /* location of next byte to be had */
 129     caddr_t in_boundry;         /* can read up to this location */
 130     long fbtbc;                 /* fragment bytes to be consumed */
 131     bool_t last_frag;
 132     u_int sendsize;
 133     u_int recvsize;
 134   }
 135 RECSTREAM;
 136
 137 static u_int fix_buf_size (u_int) internal_function;
 138 static bool_t skip_input_bytes (RECSTREAM *, long) internal_function;
 139 static bool_t flush_out (RECSTREAM *, bool_t) internal_function;
 140 static bool_t set_input_fragment (RECSTREAM *) internal_function;
 141 static bool_t get_input_bytes (RECSTREAM *, caddr_t, int) internal_function;
 142
 143 /*
 144  * Create an xdr handle for xdrrec
 145  * xdrrec_create fills in xdrs.  Sendsize and recvsize are
 146  * send and recv buffer sizes (0 => use default).
 147  * tcp_handle is an opaque handle that is passed as the first parameter to
 148  * the procedures readit and writeit.  Readit and writeit are read and
 149  * write respectively.   They are like the system
 150  * calls expect that they take an opaque handle rather than an fd.
 151  */
 152 void
 153 xdrrec_create (XDR *xdrs, u_int sendsize,
 154                u_int recvsize, caddr_t tcp_handle,
 155                int (*readit) (char *, char *, int),
 156                int (*writeit) (char *, char *, int))
 157 {
 158   RECSTREAM *rstrm = (RECSTREAM *) mem_alloc (sizeof (RECSTREAM));
 159   caddr_t tmp;
 160   char *buf;
 161
 162   sendsize = fix_buf_size (sendsize);
 163   recvsize = fix_buf_size (recvsize);
 164   buf = mem_alloc (sendsize + recvsize + BYTES_PER_XDR_UNIT);
 165
 166   if (rstrm == NULL || buf == NULL)
 167     {
 168 #ifdef USE_IN_LIBIO
 169       if (_IO_fwide (stderr, 0) > 0)
 170         (void) fwprintf (stderr, L"%s", _("xdrrec_create: out of memory\n"));
 171       else
 172 #endif
 173         (void) fputs (_("xdrrec_create: out of memory\n"), stderr);
 174       mem_free (rstrm, sizeof (RECSTREAM));
 175       mem_free (buf, sendsize + recvsize + BYTES_PER_XDR_UNIT);
 176       /*
 177        *  This is bad.  Should rework xdrrec_create to
 178        *  return a handle, and in this case return NULL
 179        */
 180       return;
 181     }
 182   /*
 183    * adjust sizes and allocate buffer quad byte aligned
 184    */
 185   rstrm->sendsize = sendsize;
 186   rstrm->recvsize = recvsize;
 187   rstrm->the_buffer = buf;
 188   tmp = rstrm->the_buffer;
 189   if ((size_t)tmp % BYTES_PER_XDR_UNIT)
 190     tmp += BYTES_PER_XDR_UNIT - (size_t)tmp % BYTES_PER_XDR_UNIT;
 191   rstrm->out_base = tmp;
 192   rstrm->in_base = tmp + sendsize;
 193   /*
 194    * now the rest ...
 195    */
 196   /* We have to add the const since the `struct xdr_ops' in `struct XDR'
 197      is not `const'.  */
 198   xdrs->x_ops = (struct xdr_ops *) &xdrrec_ops;
 199   xdrs->x_private = (caddr_t) rstrm;
 200   rstrm->tcp_handle = tcp_handle;
 201   rstrm->readit = readit;
 202   rstrm->writeit = writeit;
 203   rstrm->out_finger = rstrm->out_boundry = rstrm->out_base;
 204   rstrm->frag_header = (u_int32_t *) rstrm->out_base;
 205   rstrm->out_finger += 4;
 206   rstrm->out_boundry += sendsize;
 207   rstrm->frag_sent = FALSE;
 208   rstrm->in_size = recvsize;
 209   rstrm->in_boundry = rstrm->in_base;
 210   rstrm->in_finger = (rstrm->in_boundry += recvsize);
 211   rstrm->fbtbc = 0;
 212   rstrm->last_frag = TRUE;
 213 }
 214 libc_hidden_def(xdrrec_create)
 215
 216
 217 /*
 218  * The routines defined below are the xdr ops which will go into the
 219  * xdr handle filled in by xdrrec_create.
 220  */
 221
 222 static bool_t
 223 xdrrec_getint32 (XDR *xdrs, int32_t *ip)
 224 {
 225   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 226   int32_t *bufip = (int32_t *) rstrm->in_finger;
 227   int32_t mylong;
 228
 229   /* first try the inline, fast case */
 230   if (rstrm->fbtbc >= BYTES_PER_XDR_UNIT &&
 231       rstrm->in_boundry - (char *) bufip >= BYTES_PER_XDR_UNIT)
 232     {
 233       *ip = ntohl (*bufip);
 234       rstrm->fbtbc -= BYTES_PER_XDR_UNIT;
 235       rstrm->in_finger += BYTES_PER_XDR_UNIT;
 236     }
 237   else
 238     {
 239       if (!xdrrec_getbytes (xdrs, (caddr_t) &mylong,
 240                             BYTES_PER_XDR_UNIT))
 241         return FALSE;
 242       *ip = ntohl (mylong);
 243     }
 244   return TRUE;
 245 }
 246
 247 #if ULONG_MAX != 0xffffffff
 248 static bool_t
 249 xdrrec_getlong (XDR *xdrs, long *lp)
 250 {
 251   int32_t v;
 252   bool_t r = xdrrec_getint32 (xdrs, &v);
 253   *lp = v;
 254   return r;
 255 }
 256 #endif
 257
 258 static bool_t
 259 xdrrec_putint32 (XDR *xdrs, const int32_t *ip)
 260 {
 261   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 262   int32_t *dest_ip = (int32_t *) rstrm->out_finger;
 263
 264   if ((rstrm->out_finger += BYTES_PER_XDR_UNIT) > rstrm->out_boundry)
 265     {
 266       /*
 267        * this case should almost never happen so the code is
 268        * inefficient
 269        */
 270       rstrm->out_finger -= BYTES_PER_XDR_UNIT;
 271       rstrm->frag_sent = TRUE;
 272       if (!flush_out (rstrm, FALSE))
 273         return FALSE;
 274       dest_ip = (int32_t *) rstrm->out_finger;
 275       rstrm->out_finger += BYTES_PER_XDR_UNIT;
 276     }
 277   *dest_ip = htonl (*ip);
 278   return TRUE;
 279 }
 280
 281 #if ULONG_MAX != 0xffffffff
 282 static bool_t
 283 xdrrec_putlong (XDR *xdrs, const long *lp)
 284 {
 285   int32_t v = *lp;
 286   return xdrrec_putint32 (xdrs, &v);
 287 }
 288 #endif
 289
 290 static bool_t      /* must manage buffers, fragments, and records */
 291 xdrrec_getbytes (XDR *xdrs, caddr_t addr, u_int len)
 292 {
 293   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 294   u_int current;
 295
 296   while (len > 0)
 297     {
 298       current = rstrm->fbtbc;
 299       if (current == 0)
 300         {
 301           if (rstrm->last_frag)
 302             return FALSE;
 303           if (!set_input_fragment (rstrm))
 304             return FALSE;
 305           continue;
 306         }
 307       current = (len < current) ? len : current;
 308       if (!get_input_bytes (rstrm, addr, current))
 309         return FALSE;
 310       addr += current;
 311       rstrm->fbtbc -= current;
 312       len -= current;
 313     }
 314   return TRUE;
 315 }
 316
 317 static bool_t
 318 xdrrec_putbytes (XDR *xdrs, const char *addr, u_int len)
 319 {
 320   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 321   u_int current;
 322
 323   while (len > 0)
 324     {
 325       current = rstrm->out_boundry - rstrm->out_finger;
 326       current = (len < current) ? len : current;
 327       memcpy (rstrm->out_finger, addr, current);
 328       rstrm->out_finger += current;
 329       addr += current;
 330       len -= current;
 331       if (rstrm->out_finger == rstrm->out_boundry && len > 0)
 332         {
 333           rstrm->frag_sent = TRUE;
 334           if (!flush_out (rstrm, FALSE))
 335             return FALSE;
 336         }
 337     }
 338   return TRUE;
 339 }
 340
 341 static u_int
 342 xdrrec_getpos (const XDR *xdrs)
 343 {
 344   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 345   long pos;
 346
 347   pos = lseek ((int) (long) rstrm->tcp_handle, (long) 0, 1);
 348   if (pos != -1)
 349     switch (xdrs->x_op)
 350       {
 351
 352       case XDR_ENCODE:
 353         pos += rstrm->out_finger - rstrm->out_base;
 354         break;
 355
 356       case XDR_DECODE:
 357         pos -= rstrm->in_boundry - rstrm->in_finger;
 358         break;
 359
 360       default:
 361         pos = (u_int) - 1;
 362         break;
 363       }
 364   return (u_int) pos;
 365 }
 366
 367 static bool_t
 368 xdrrec_setpos (XDR *xdrs, u_int pos)
 369 {
 370   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 371   u_int currpos = xdrrec_getpos (xdrs);
 372   int delta = currpos - pos;
 373   caddr_t newpos;
 374
 375   if ((int) currpos != -1)
 376     switch (xdrs->x_op)
 377       {
 378
 379       case XDR_ENCODE:
 380         newpos = rstrm->out_finger - delta;
 381         if (newpos > (caddr_t) rstrm->frag_header &&
 382             newpos < rstrm->out_boundry)
 383           {
 384             rstrm->out_finger = newpos;
 385             return TRUE;
 386           }
 387         break;
 388
 389       case XDR_DECODE:
 390         newpos = rstrm->in_finger - delta;
 391         if ((delta < (int) (rstrm->fbtbc)) &&
 392             (newpos <= rstrm->in_boundry) &&
 393             (newpos >= rstrm->in_base))
 394           {
 395             rstrm->in_finger = newpos;
 396             rstrm->fbtbc -= delta;
 397             return TRUE;
 398           }
 399         break;
 400
 401       default:
 402         break;
 403       }
 404   return FALSE;
 405 }
 406
 407 static int32_t *
 408 xdrrec_inline (XDR *xdrs, u_int len)
 409 {
 410   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 411   int32_t *buf = NULL;
 412
 413   switch (xdrs->x_op)
 414     {
 415
 416     case XDR_ENCODE:
 417       if ((rstrm->out_finger + len) <= rstrm->out_boundry)
 418         {
 419           buf = (int32_t *) rstrm->out_finger;
 420           rstrm->out_finger += len;
 421         }
 422       break;
 423
 424     case XDR_DECODE:
 425       if ((len <= rstrm->fbtbc) &&
 426           ((rstrm->in_finger + len) <= rstrm->in_boundry))
 427         {
 428           buf = (int32_t *) rstrm->in_finger;
 429           rstrm->fbtbc -= len;
 430           rstrm->in_finger += len;
 431         }
 432       break;
 433
 434     default:
 435       break;
 436     }
 437   return buf;
 438 }
 439
 440 static void
 441 xdrrec_destroy (XDR *xdrs)
 442 {
 443   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 444
 445   mem_free (rstrm->the_buffer,
 446             rstrm->sendsize + rstrm->recvsize + BYTES_PER_XDR_UNIT);
 447   mem_free ((caddr_t) rstrm, sizeof (RECSTREAM));
 448 }
 449
 450 /*
 451  * Exported routines to manage xdr records
 452  */
 453
 454 /*
 455  * Before reading (deserializing from the stream, one should always call
 456  * this procedure to guarantee proper record alignment.
 457  */
 458 bool_t
 459 xdrrec_skiprecord (XDR *xdrs)
 460 {
 461   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 462
 463   while (rstrm->fbtbc > 0 || (!rstrm->last_frag))
 464     {
 465       if (!skip_input_bytes (rstrm, rstrm->fbtbc))
 466         return FALSE;
 467       rstrm->fbtbc = 0;
 468       if ((!rstrm->last_frag) && (!set_input_fragment (rstrm)))
 469         return FALSE;
 470     }
 471   rstrm->last_frag = FALSE;
 472   return TRUE;
 473 }
 474 libc_hidden_def(xdrrec_skiprecord)
 475
 476 /*
 477  * Lookahead function.
 478  * Returns TRUE iff there is no more input in the buffer
 479  * after consuming the rest of the current record.
 480  */
 481 bool_t
 482 xdrrec_eof (XDR *xdrs)
 483 {
 484   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 485
 486   while (rstrm->fbtbc > 0 || (!rstrm->last_frag))
 487     {
 488       if (!skip_input_bytes (rstrm, rstrm->fbtbc))
 489         return TRUE;
 490       rstrm->fbtbc = 0;
 491       if ((!rstrm->last_frag) && (!set_input_fragment (rstrm)))
 492         return TRUE;
 493     }
 494   if (rstrm->in_finger == rstrm->in_boundry)
 495     return TRUE;
 496   return FALSE;
 497 }
 498 libc_hidden_def(xdrrec_eof)
 499
 500 /*
 501  * The client must tell the package when an end-of-record has occurred.
 502  * The second parameter tells whether the record should be flushed to the
 503  * (output) tcp stream.  (This lets the package support batched or
 504  * pipelined procedure calls.)  TRUE => immediate flush to tcp connection.
 505  */
 506 bool_t
 507 xdrrec_endofrecord (XDR *xdrs, bool_t sendnow)
 508 {
 509   RECSTREAM *rstrm = (RECSTREAM *) xdrs->x_private;
 510   u_long len;           /* fragment length */
 511
 512   if (sendnow || rstrm->frag_sent
 513       || rstrm->out_finger + BYTES_PER_XDR_UNIT >= rstrm->out_boundry)
 514     {
 515       rstrm->frag_sent = FALSE;
 516       return flush_out (rstrm, TRUE);
 517     }
 518   len = (rstrm->out_finger - (char *) rstrm->frag_header
 519          - BYTES_PER_XDR_UNIT);
 520   *rstrm->frag_header = htonl ((u_long) len | LAST_FRAG);
 521   rstrm->frag_header = (u_int32_t *) rstrm->out_finger;
 522   rstrm->out_finger += BYTES_PER_XDR_UNIT;
 523   return TRUE;
 524 }
 525 libc_hidden_def(xdrrec_endofrecord)
 526
 527 /*
 528  * Internal useful routines
 529  */
 530 static bool_t
 531 internal_function
 532 flush_out (RECSTREAM *rstrm, bool_t eor)
 533 {
 534   u_long eormask = (eor == TRUE) ? LAST_FRAG : 0;
 535   u_long len = (rstrm->out_finger - (char *) rstrm->frag_header
 536                 - BYTES_PER_XDR_UNIT);
 537
 538   *rstrm->frag_header = htonl (len | eormask);
 539   len = rstrm->out_finger - rstrm->out_base;
 540   if ((*(rstrm->writeit)) (rstrm->tcp_handle, rstrm->out_base, (int) len)
 541       != (int) len)
 542     return FALSE;
 543   rstrm->frag_header = (u_int32_t *) rstrm->out_base;
 544   rstrm->out_finger = (caddr_t) rstrm->out_base + BYTES_PER_XDR_UNIT;
 545   return TRUE;
 546 }
 547
 548 static bool_t   /* knows nothing about records!  Only about input buffers */
 549 fill_input_buf (RECSTREAM *rstrm)
 550 {
 551   caddr_t where;
 552   size_t i;
 553   int len;
 554
 555   where = rstrm->in_base;
 556   i = (size_t) rstrm->in_boundry % BYTES_PER_XDR_UNIT;
 557   where += i;
 558   len = rstrm->in_size - i;
 559   if ((len = (*(rstrm->readit)) (rstrm->tcp_handle, where, len)) == -1)
 560     return FALSE;
 561   rstrm->in_finger = where;
 562   where += len;
 563   rstrm->in_boundry = where;
 564   return TRUE;
 565 }
 566
 567 static bool_t   /* knows nothing about records!  Only about input buffers */
 568 internal_function
 569 get_input_bytes (RECSTREAM *rstrm, caddr_t addr, int len)
 570 {
 571   int current;
 572
 573   while (len > 0)
 574     {
 575       current = rstrm->in_boundry - rstrm->in_finger;
 576       if (current == 0)
 577         {
 578           if (!fill_input_buf (rstrm))
 579             return FALSE;
 580           continue;
 581         }
 582       current = (len < current) ? len : current;
 583       memcpy (addr, rstrm->in_finger, current);
 584       rstrm->in_finger += current;
 585       addr += current;
 586       len -= current;
 587     }
 588   return TRUE;
 589 }
 590
 591 static bool_t /* next two bytes of the input stream are treated as a header */
 592 internal_function
 593 set_input_fragment (RECSTREAM *rstrm)
 594 {
 595   uint32_t header;
 596
 597   if (! get_input_bytes (rstrm, (caddr_t)&header, BYTES_PER_XDR_UNIT))
 598     return FALSE;
 599   header = ntohl (header);
 600   rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE;
 601   /*
 602    * Sanity check. Try not to accept wildly incorrect fragment
 603    * sizes. Unfortunately, only a size of zero can be identified as
 604    * 'wildely incorrect', and this only, if it is not the last
 605    * fragment of a message. Ridiculously large fragment sizes may look
 606    * wrong, but we don't have any way to be certain that they aren't
 607    * what the client actually intended to send us. Many existing RPC
 608    * implementations may sent a fragment of size zero as the last
 609    * fragment of a message.
 610    */
 611   if (header == 0)
 612     return FALSE;
 613   rstrm->fbtbc = header & ~LAST_FRAG;
 614   return TRUE;
 615 }
 616
 617 static bool_t   /* consumes input bytes; knows nothing about records! */
 618 internal_function
 619 skip_input_bytes (RECSTREAM *rstrm, long cnt)
 620 {
 621   int current;
 622
 623   while (cnt > 0)
 624     {
 625       current = rstrm->in_boundry - rstrm->in_finger;
 626       if (current == 0)
 627         {
 628           if (!fill_input_buf (rstrm))
 629             return FALSE;
 630           continue;
 631         }
 632       current = (cnt < current) ? cnt : current;
 633       rstrm->in_finger += current;
 634       cnt -= current;
 635     }
 636   return TRUE;
 637 }
 638
 639 static u_int
 640 internal_function
 641 fix_buf_size (u_int s)
 642 {
 643   if (s < 100)
 644     s = 4000;
 645   return RNDUP (s);
 646 }