diff options
author | David Gibson <david@gibson.dropbear.id.au> | 2010-03-09 17:39:14 +1100 |
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committer | Gerald Van Baren <gvb@unssw.com> | 2011-07-14 21:10:34 -0400 |
commit | d1c6314887c4d6712f7bd9ba7428b6517e7732e0 (patch) | |
tree | a9024f1d034b79cf87dba9d49037e3b7543a9920 /lib/libfdt/fdt.c | |
parent | 05a22ba096fb996bb69ab020a8d08aafac2c28ba (diff) |
libfdt: Implement property iteration functions
For ages, we've been talking about adding functions to libfdt to allow
iteration through properties. So, finally, here are some.
I got bogged down on this for a long time because I didn't want to
expose offsets directly to properties to the callers. But without
that, attempting to make reasonable iteration functions just became
horrible. So eventually, I settled on an interface which does now
expose property offsets. fdt_first_property_offset() and
fdt_next_property_offset() are used to step through the offsets of the
properties starting from a particularly node offset. The details of
the property at each offset can then be retrieved with either
fdt_get_property_by_offset() or fdt_getprop_by_offset() which have
interfaces similar to fdt_get_property() and fdt_getprop()
respectively.
No explicit testcases are included, but we do use the new functions to
reimplement the existing fdt_get_property() function.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This was extracted from the DTC commit:
73dca9ae0b9abe6924ba640164ecce9f8df69c5a Mon Sep 17 00:00:00 2001
Signed-off-by: Gerald Van Baren <vanbaren@cideas.com>
Diffstat (limited to 'lib/libfdt/fdt.c')
-rw-r--r-- | lib/libfdt/fdt.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/libfdt/fdt.c b/lib/libfdt/fdt.c index b09ea6f04d..4157b21efd 100644 --- a/lib/libfdt/fdt.c +++ b/lib/libfdt/fdt.c @@ -153,6 +153,15 @@ int _fdt_check_node_offset(const void *fdt, int offset) return offset; } +int _fdt_check_prop_offset(const void *fdt, int offset) +{ + if ((offset < 0) || (offset % FDT_TAGSIZE) + || (fdt_next_tag(fdt, offset, &offset) != FDT_PROP)) + return -FDT_ERR_BADOFFSET; + + return offset; +} + int fdt_next_node(const void *fdt, int offset, int *depth) { int nextoffset = 0; |