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author | Thierry Reding <treding@nvidia.com> | 2014-08-26 19:33:50 +0400 |
---|---|---|
committer | Simon Glass <sjg@chromium.org> | 2014-10-23 02:56:40 +0400 |
commit | bc4147ab2d698bf7375a10af73ce34d76129edff (patch) | |
tree | a5e205438538b11f1c36b4771764e70034270a30 | |
parent | a84c8107d9b050fe8a31220d28588abfc2d99aee (diff) | |
download | u-boot-bc4147ab2d698bf7375a10af73ce34d76129edff.tar.xz |
fdt: Add a function to count strings
Given a device tree node and a property name, the fdt_count_strings()
function counts the number of strings found in the property value.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
-rw-r--r-- | include/libfdt.h | 9 | ||||
-rw-r--r-- | lib/libfdt/fdt_ro.c | 20 |
2 files changed, 29 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h index a1ef1e15df..cf97bf0b3b 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -857,6 +857,15 @@ int fdt_node_offset_by_compatible(const void *fdt, int startoffset, */ int fdt_stringlist_contains(const char *strlist, int listlen, const char *str); +/** + * fdt_count_strings - count the number of strings in a string list + * @fdt: pointer to the device tree blob + * @node: offset of the node + * @property: name of the property containing the string list + * @return: the number of strings in the given property + */ +int fdt_count_strings(const void *fdt, int node, const char *property); + /**********************************************************************/ /* Read-only functions (addressing related) */ /**********************************************************************/ diff --git a/lib/libfdt/fdt_ro.c b/lib/libfdt/fdt_ro.c index 36af043525..cb06a9b50d 100644 --- a/lib/libfdt/fdt_ro.c +++ b/lib/libfdt/fdt_ro.c @@ -491,6 +491,26 @@ int fdt_stringlist_contains(const char *strlist, int listlen, const char *str) return 0; } +int fdt_count_strings(const void *fdt, int node, const char *property) +{ + int length, i, count = 0; + const char *list; + + list = fdt_getprop(fdt, node, property, &length); + if (!list) + return -length; + + for (i = 0; i < length; i++) { + int len = strlen(list); + + list += len + 1; + i += len; + count++; + } + + return count; +} + int fdt_node_check_compatible(const void *fdt, int nodeoffset, const char *compatible) { |