fdt_offset_ptr(9)

hi bestie 💖 this is the fdt_offset_ptr(9) page from the Kernel API Manual, and it’s lowkey a safety baddie. no cap.

💖 NAME 💖

• fdt_offset_ptr — safely get a byte range within the device tree blob. periodt. ✨

✨ SYNOPSIS ✨

const void * fdt_offset_ptr (const void *fdt , int offset , unsigned int checklen );

🫶 ARGUMENTS 🫶

• fdt — pointer to the device tree blob, bestie.
• offset — offset within the blob to the desired byte range.
• checklen — required length of the byte range. like, how many bytes u need, fr fr.

🌸 DESCRIPTION 🌸

okay so fdt_offset_ptr returns a pointer to the byte range of length checklen at the given offset within the device tree blob. but first it does the vibe check: it verifies that the byte range fits entirely within the blob and does not overflow. the safety of it all is the main character energy 💅

🎀 RETURN 🎀

on success, u get a pointer to the byte range. if the requested range does not fit within the blob, u get NULL. that’s the whole return situation, no cap. 🫶

👀 SEE ALSO 👀

Kernel file ./scripts/dtc/libfdt/libfdt.h — plus the whole fdt friend group:

• fdt_next_tag(9)
• fdt_first_subnode(9), fdt_next_subnode(9), fdt_for_each_subnode(9)
• fdt_header_size(9), fdt_header_size_(9), fdt_check_header(9)
• fdt_move(9), fdt_check_full(9), fdt_get_string(9), fdt_string(9)
• fdt_find_max_phandle(9), fdt_get_max_phandle(9)
• fdt_generate_phandle(9), fdt_num_mem_rsv(9), fdt_get_mem_rsv(9)
• fdt_subnode_offset_namelen(9), fdt_subnode_offset(9)
• fdt_path_offset_namelen(9), fdt_path_offset(9), fdt_get_name(9)
• fdt_first_property_offset(9), fdt_next_property_offset(9)
• fdt_for_each_property_offset(9), fdt_get_property_by_offset(9)
• fdt_get_property_namelen(9), fdt_get_property(9)
• fdt_getprop_by_offset(9), fdt_getprop_namelen(9), fdt_getprop(9)
• fdt_get_phandle(9), fdt_get_alias_namelen(9), fdt_get_alias(9)
• fdt_get_symbol_namelen(9), fdt_get_symbol(9), fdt_get_path(9)
• fdt_supernode_atdepth_offset(9), fdt_node_depth(9)
• fdt_parent_offset(9), fdt_node_offset_by_prop_value(9)
• fdt_node_offset_by_phandle(9), fdt_node_check_compatible(9)
• fdt_node_offset_by_compatible(9), fdt_stringlist_contains(9)
• fdt_stringlist_count(9), fdt_stringlist_search(9)
• fdt_stringlist_get(9), FDT_MAX_NCELLS(9), fdt_address_cells(9)
• fdt_size_cells(9), fdt_setprop_inplace_namelen_partial(9)
• fdt_setprop_inplace(9), fdt_setprop_inplace_u32(9)
• fdt_setprop_inplace_u64(9), fdt_setprop_inplace_cell(9)
• fdt_nop_property(9), fdt_nop_node(9), fdt_create_with_flags(9)
• fdt_create(9), fdt_resize(9), fdt_add_reservemap_entry(9)
• fdt_finish_reservemap(9), fdt_begin_node(9), fdt_property(9)
• fdt_property_placeholder(9), fdt_end_node(9), fdt_finish(9)
• fdt_create_empty_tree(9), fdt_open_into(9), fdt_pack(9)
• fdt_add_mem_rsv(9), fdt_del_mem_rsv(9), fdt_set_name(9)
• fdt_setprop_namelen(9), fdt_setprop(9)
• fdt_setprop_placeholder_namelen(9), fdt_setprop_placeholder(9)
• fdt_setprop_u32(9), fdt_setprop_u64(9), fdt_setprop_cell(9)
• fdt_setprop_string(9), fdt_setprop_namelen_string(9)
• fdt_setprop_empty(9), fdt_appendprop(9), fdt_appendprop_u32(9)
• fdt_appendprop_u64(9), fdt_appendprop_cell(9), fdt_appendprop_string(9)
• fdt_appendprop_addrrange(9), fdt_delprop(9), fdt_add_subnode_namelen(9)
• fdt_add_subnode(9), fdt_del_node(9), fdt_overlay_apply(9)
• fdt_overlay_target_offset(9), fdt_strerror(9)

p.s. this page comes from ./scripts/dtc/libfdt, dated October 2026 — source/version and date noted, mwah 💋👑