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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [sbrk.c] - Blame information for rev 455

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Line No. Rev Author Line
1 148 jeremybenn
/* sbrk.c -- allocate memory dynamically.
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 *
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 * Copyright (c) 1995,1996 Cygnus Support
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 *
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 * The authors hereby grant permission to use, copy, modify, distribute,
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 * and license this software and its documentation for any purpose, provided
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 * that existing copyright notices are retained in all copies and that this
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 * notice is included verbatim in any distributions. No written agreement,
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 * license, or royalty fee is required for any of the authorized uses.
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 * Modifications to this software may be copyrighted by their authors
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 * and need not follow the licensing terms described here, provided that
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 * the new terms are clearly indicated on the first page of each file where
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 * they apply.
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 */
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#include <errno.h>
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#include "glue.h"
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/* just in case, most boards have at least some memory */
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#ifndef RAMSIZE
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#  define RAMSIZE             (caddr_t)0x100000
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#endif
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char *heap_ptr;
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/*
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 * sbrk -- changes heap size size. Get nbytes more
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 *         RAM. We just increment a pointer in what's
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 *         left of memory on the board.
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 */
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char *
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sbrk (nbytes)
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     int nbytes;
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{
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  char        *base;
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  if (!heap_ptr)
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    heap_ptr = (char *)&_end;
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  base = heap_ptr;
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  heap_ptr += nbytes;
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  return base;
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/* FIXME: We really want to make sure we don't run out of RAM, but this
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 *       isn't very portable.
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 */
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#if 0
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  if ((RAMSIZE - heap_ptr - nbytes) >= 0) {
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    base = heap_ptr;
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    heap_ptr += nbytes;
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    return (base);
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  } else {
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    errno = ENOMEM;
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    return ((char *)-1);
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  }
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#endif
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}

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