dtc/libfdt/fdt.c

77 const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
79 	unsigned absoffset = offset + fdt_off_dt_struct(fdt);
81 	if ((absoffset < offset)
87 		if (((offset + len) < offset)
88 		    || ((offset + len) > fdt_size_dt_struct(fdt)))
91 	return _fdt_offset_ptr(fdt, offset);
98 	int offset = startoffset;
102 	tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
106 	offset += FDT_TAGSIZE;
113 			p = fdt_offset_ptr(fdt, offset++, 1);
120 		lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
123 		/* skip-name offset, length and value */
124 		offset += sizeof(struct fdt_property) - FDT_TAGSIZE
137 	if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
140 	*nextoffset = FDT_TAGALIGN(offset);
144 int _fdt_check_node_offset(const void *fdt, int offset)
146 	if ((offset < 0) || (offset % FDT_TAGSIZE)
147 	    || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
150 	return offset;
153 int _fdt_check_prop_offset(const void *fdt, int offset)
155 	if ((offset < 0) || (offset % FDT_TAGSIZE)
156 	    || (fdt_next_tag(fdt, offset, &offset) != FDT_PROP))
159 	return offset;
162 int fdt_next_node(const void *fdt, int offset, int *depth)
167 	if (offset >= 0)
168 		if ((nextoffset = _fdt_check_node_offset(fdt, offset)) < 0)
172 		offset = nextoffset;
173 		tag = fdt_next_tag(fdt, offset, &nextoffset);
199 	return offset;
202 int fdt_first_subnode(const void *fdt, int offset)
206 	offset = fdt_next_node(fdt, offset, &depth);
207 	if (offset < 0 || depth != 1)
210 	return offset;
213 int fdt_next_subnode(const void *fdt, int offset)
222 		offset = fdt_next_node(fdt, offset, &depth);
223 		if (offset < 0 || depth < 1)
227 	return offset;