dtc/libfdt/fdt.c

140 const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
142 	unsigned int uoffset = offset;
143 	unsigned int absoffset = offset + fdt_off_dt_struct(fdt);
145 	if (offset < 0)
156 		    || ((offset + len) > fdt_size_dt_struct(fdt)))
159 	return fdt_offset_ptr_(fdt, offset);
166 	int offset = startoffset;
170 	tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
174 	offset += FDT_TAGSIZE;
181 			p = fdt_offset_ptr(fdt, offset++, 1);
188 		lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
193 		sum = len + offset;
195 		    (INT_MAX <= sum || sum < (uint32_t) offset))
198 		/* skip-name offset, length and value */
199 		offset += sizeof(struct fdt_property) - FDT_TAGSIZE + len;
203 		    ((offset - len) % 8) != 0)
204 			offset += 4;
216 	if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
219 	*nextoffset = FDT_TAGALIGN(offset);
223 int fdt_check_node_offset_(const void *fdt, int offset)
226 	    && ((offset < 0) || (offset % FDT_TAGSIZE)))
229 	if (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE)
232 	return offset;
235 int fdt_check_prop_offset_(const void *fdt, int offset)
238 	    && ((offset < 0) || (offset % FDT_TAGSIZE)))
241 	if (fdt_next_tag(fdt, offset, &offset) != FDT_PROP)
244 	return offset;
247 int fdt_next_node(const void *fdt, int offset, int *depth)
252 	if (offset >= 0)
253 		if ((nextoffset = fdt_check_node_offset_(fdt, offset)) < 0)
257 		offset = nextoffset;
258 		tag = fdt_next_tag(fdt, offset, &nextoffset);
284 	return offset;
287 int fdt_first_subnode(const void *fdt, int offset)
291 	offset = fdt_next_node(fdt, offset, &depth);
292 	if (offset < 0 || depth != 1)
295 	return offset;
298 int fdt_next_subnode(const void *fdt, int offset)
307 		offset = fdt_next_node(fdt, offset, &depth);
308 		if (offset < 0 || depth < 1)
312 	return offset;