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libfdt: Add fdt_set_name() function

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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 <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2008-01-11 14:55:05 +11:00 committed by Gerald Van Baren
parent fdeb932b1c
commit 9eaeb07a71
2 changed files with 50 additions and 0 deletions
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26
include/libfdt.h
View File

@ -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

24
libfdt/fdt_rw.c
View File

@ -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)
{