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https://github.com/dgibson/dtc.git
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3aa4cfd66b
The range sanity checking on the fdt_string_cmp() function causes problems for the sequential write code (or at least for using RO functions on an incomplete SW tree). Plus they didn't really fit with the philosphy for the RO code of working as widely as possible on weirdly constructed trees.
74 lines
1.9 KiB
C
74 lines
1.9 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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void *fdt_offset_ptr(const struct fdt_header *fdt, int offset, int len)
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{
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void *p;
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p = (void *)fdt + fdt32_to_cpu(fdt->off_dt_struct) + 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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uint32_t _fdt_next_tag(const struct fdt_header *fdt, int offset, int *nextoffset)
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{
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const uint32_t *tagp, *lenp;
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uint32_t tag;
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const char *p;
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if (offset % FDT_TAGSIZE)
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return -1;
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tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
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if (! tagp)
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return FDT_END; /* premature end */
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tag = fdt32_to_cpu(*tagp);
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offset += FDT_TAGSIZE;
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switch (tag) {
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case FDT_BEGIN_NODE:
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/* skip name */
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do {
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p = fdt_offset_ptr(fdt, offset++, 1);
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} while (p && (*p != '\0'));
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if (! p)
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return FDT_END;
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break;
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case FDT_PROP:
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lenp = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, sizeof(*lenp));
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if (! lenp)
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return FDT_END;
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/* skip name offset, length and value */
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offset += 2*FDT_TAGSIZE + fdt32_to_cpu(*lenp);
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break;
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}
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if (nextoffset)
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*nextoffset = ALIGN(offset, FDT_TAGSIZE);
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return tag;
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}
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