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/* Copyright (C) 1991, 1995, 1996, 1997, 2000 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <unistd.h>

#include <errno.h>

/* Defined in brk.c.  */

extern void *___brk_addr;

extern int brk (void *addr);

/* Extend the process's data space by INCREMENT.

   If INCREMENT is negative, shrink data space by - INCREMENT.

   Return start of new space allocated, or -1 for errors.  */

void * sbrk (intptr_t increment)

{

    void *oldbrk;

    if (___brk_addr == NULL)

        if (brk (0) < 0)          /* Initialize the break.  */

            return (void *) -1;

    if (increment == 0)

        return ___brk_addr;

    oldbrk = ___brk_addr;

    if (brk (oldbrk + increment) < 0)

        return (void *) -1;

    return oldbrk;

}