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/* sbrk.c -- allocate memory dynamically.

 *

 * Copyright (c) 1995,1996,1999 Cygnus Support

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include <sys/types.h>

#include <sys/stat.h>

#include "glue.h"

caddr_t

_sbrk (size_t incr)

{

  static char *heap_end;

  char *prev_heap_end;

  char *sp = (char *)&sp;

  if (heap_end == 0)

    {

      heap_end = _end;

    }

  prev_heap_end = heap_end;

  if (heap_end > sp)

    {

      _write (1, "Heap and stack collision\n", 25);

#if 0 /* Calling abort brings in the signal handling code.  */

      abort ();

#else

      exit (1);

#endif

    }

  heap_end += incr;

  return (caddr_t) prev_heap_end;

}