86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2006 David Gibson, IBM Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libfdt_env.h"
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#include <fdt.h>
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#include <libfdt.h>
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#include "libfdt_internal.h"
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int fdt_check_header(const void *fdt)
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{
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if (fdt_magic(fdt) == FDT_MAGIC) {
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/* Complete tree */
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if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
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return -FDT_ERR_BADVERSION;
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if (fdt_last_comp_version(fdt) > FDT_LAST_SUPPORTED_VERSION)
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return -FDT_ERR_BADVERSION;
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} else if (fdt_magic(fdt) == SW_MAGIC) {
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/* Unfinished sequential-write blob */
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if (fdt_size_dt_struct(fdt) == 0)
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return -FDT_ERR_BADSTATE;
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} else {
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return -FDT_ERR_BADMAGIC;
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}
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return 0;
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}
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void *fdt_offset_ptr(const void *fdt, int offset, int len)
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{
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void *p;
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if (fdt_version(fdt) >= 0x11)
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if (((offset + len) < offset)
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|| ((offset + len) > fdt_size_dt_struct(fdt)))
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return NULL;
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p = _fdt_offset_ptr(fdt, offset);
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if (p + len < p)
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return NULL;
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return p;
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}
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const char *_fdt_find_string(const char *strtab, int tabsize, const char *s)
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{
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int len = strlen(s) + 1;
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const char *last = strtab + tabsize - len;
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const char *p;
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for (p = strtab; p <= last; p++)
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if (memeq(p, s, len))
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return p;
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return NULL;
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}
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int fdt_move(const void *fdt, void *buf, int bufsize)
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{
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int err = fdt_check_header(fdt);
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if (err)
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return err;
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if (fdt_totalsize(fdt) > bufsize)
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return -FDT_ERR_NOSPACE;
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memmove(buf, fdt, fdt_totalsize(fdt));
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return 0;
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}
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