libgloss/rs6000/sim-sbrk.c

   1 /*
   2  * sim-sbrk.c -- PowerPC sbrk support when running under the simulator.
   3  *
   4  * Copyright (c) 1995 Cygnus Support
   5  *
   6  * The authors hereby grant permission to use, copy, modify, distribute,
   7  * and license this software and its documentation for any purpose, provided
   8  * that existing copyright notices are retained in all copies and that this
   9  * notice is included verbatim in any distributions. No written agreement,
  10  * license, or royalty fee is required for any of the authorized uses.
  11  * Modifications to this software may be copyrighted by their authors
  12  * and need not follow the licensing terms described here, provided that
  13  * the new terms are clearly indicated on the first page of each file where
  14  * they apply.
  15  */
  16
  17 extern char _end[];
  18 static char *curbrk = _end;
  19
  20 char *
  21 sbrk (incr)
  22      int incr;
  23 {
  24   char *oldbrk = curbrk;
  25   curbrk += incr;
  26   if (brk (curbrk) == -1)
  27     return (char *) -1;
  28
  29   return oldbrk;
  30 }