contrib/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
127 		    ((offset - fdt32_to_cpu(*lenp)) % 8) != 0)
128 			offset += 4;
140 	if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
143 	*nextoffset = FDT_TAGALIGN(offset);
147 int fdt_check_node_offset_(const void *fdt, int offset)
149 	if ((offset < 0) || (offset % FDT_TAGSIZE)
150 	    || (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
153 	return offset;
156 int fdt_check_prop_offset_(const void *fdt, int offset)
158 	if ((offset < 0) || (offset % FDT_TAGSIZE)
159 	    || (fdt_next_tag(fdt, offset, &offset) != FDT_PROP))
162 	return offset;
165 int fdt_next_node(const void *fdt, int offset, int *depth)
170 	if (offset >= 0)
171 		if ((nextoffset = fdt_check_node_offset_(fdt, offset)) < 0)
175 		offset = nextoffset;
176 		tag = fdt_next_tag(fdt, offset, &nextoffset);
202 	return offset;
205 int fdt_first_subnode(const void *fdt, int offset)
209 	offset = fdt_next_node(fdt, offset, &depth);
210 	if (offset < 0 || depth != 1)
213 	return offset;
216 int fdt_next_subnode(const void *fdt, int offset)
225 		offset = fdt_next_node(fdt, offset, &depth);
226 		if (offset < 0 || depth < 1)
230 	return offset;