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3d10b04f1e
Similar to what's been done in the ports, but this time in generic code. Add missing #includes to pick up prototypes. Add prototypes for various internal functions where needed. Fix signatures of various functions to match what's provided by the headers (read, sbrk, write, unlink). Nearly done with this effort ;-) Pushed to the trunk,
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/* 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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void *
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sbrk (ptrdiff_t 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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