From 9eaeb07a7185d852c7aa10735ecd4e9edf24fb5d Mon Sep 17 00:00:00 2001 From: David Gibson Date: Fri, 11 Jan 2008 14:55:05 +1100 Subject: [PATCH] libfdt: Add fdt_set_name() function This patch adds an fdt_set_name() function to libfdt, mirroring fdt_get_name(). This is a r/w function which alters the name of a given device tree node. Signed-off-by: David Gibson --- include/libfdt.h | 26 ++++++++++++++++++++++++++ libfdt/fdt_rw.c | 24 ++++++++++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/include/libfdt.h b/include/libfdt.h index 6c05236858..f634a9c8df 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -845,6 +845,32 @@ int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size); */ int fdt_del_mem_rsv(void *fdt, int n); +/** + * fdt_set_name - change the name of a given node + * @fdt: pointer to the device tree blob + * @nodeoffset: structure block offset of a node + * @name: name to give the node + * + * fdt_set_name() replaces the name (including unit address, if any) + * of the given node with the given string. NOTE: this function can't + * efficiently check if the new name is unique amongst the given + * node's siblings; results are undefined if this function is invoked + * with a name equal to one of the given node's siblings. + * + * This function may insert or delete data from the blob, and will + * therefore change the offsets of some existing nodes. + * + * returns: + * 0, on success + * -FDT_ERR_NOSPACE, there is insufficient free space in the blob + * to contain the new name + * -FDT_ERR_BADOFFSET, nodeoffset did not point to FDT_BEGIN_NODE tag + * -FDT_ERR_BADMAGIC, + * -FDT_ERR_BADVERSION, + * -FDT_ERR_BADSTATE, standard meanings + */ +int fdt_set_name(void *fdt, int nodeoffset, const char *name); + /** * fdt_setprop - create or change a property * @fdt: pointer to the device tree blob diff --git a/libfdt/fdt_rw.c b/libfdt/fdt_rw.c index 6673f8ec96..a1c70ff154 100644 --- a/libfdt/fdt_rw.c +++ b/libfdt/fdt_rw.c @@ -252,6 +252,30 @@ static int _add_property(void *fdt, int nodeoffset, const char *name, int len, return 0; } +int fdt_set_name(void *fdt, int nodeoffset, const char *name) +{ + char *namep; + int oldlen, newlen; + int err; + + if ((err = rw_check_header(fdt))) + return err; + + namep = (char *)fdt_get_name(fdt, nodeoffset, &oldlen); + if (!namep) + return oldlen; + + newlen = strlen(name); + + err = _blob_splice_struct(fdt, namep, ALIGN(oldlen+1, FDT_TAGSIZE), + ALIGN(newlen+1, FDT_TAGSIZE)); + if (err) + return err; + + memcpy(namep, name, newlen+1); + return 0; +} + int fdt_setprop(void *fdt, int nodeoffset, const char *name, const void *val, int len) { -- 2.25.1