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libfdt: Fix handling of trailing / in fdt_path_offset() 

Currently, fdt_path_offset() returns FDL_ERR_BADOFFSET if given a path
with a trailing '/'.  In particular this means that
fdt_path_offset("/") returns FDT_ERR_BADOFFSET rather than 0 as one
would expect.

This patch fixes the function to accept and ignore trailing '/'
characters.  As well as allowing fdt_path_offset("/") this means that
fdt_path_offset("/foo/") will return the same as
fdt_path_offset("/foo") which seems in keeping with the principle of
least surprise.

This also adds a testcase to ensure that fdt_path_offset("/") returns
0 as it should.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
main
David Gibson 2007-08-29 12:22:50 +10:00 committed by Jon Loeliger
parent 5cb1fbdd7c
commit bd2ae2f41c
2 changed files with 9 additions and 1 deletions
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2
libfdt/fdt_ro.c
View File

@ -154,7 +154,7 @@ int fdt_path_offset(const void *fdt, const char *path)
while (*p == '/')
p++;
if (! *p)
return -FDT_ERR_BADPATH;
return offset;
q = strchr(p, '/');
if (! q)
q = end;

8
tests/path_offset.c
View File

@ -58,6 +58,7 @@ int check_subnode(void *fdt, int parent, const char *name)
int main(int argc, char *argv[])
{
void *fdt;
int root_offset;
int subnode1_offset, subnode2_offset;
int subnode1_offset_p, subnode2_offset_p;
int subsubnode1_offset, subsubnode2_offset;
@ -66,6 +67,13 @@ int main(int argc, char *argv[])
test_init(argc, argv);
fdt = load_blob_arg(argc, argv);

root_offset = fdt_path_offset(fdt, "/");
if (root_offset < 0)
FAIL("fdt_path_offset(\"/\") failed: %s",
fdt_strerror(root_offset));
else if (root_offset != 0)
FAIL("fdt_path_offset(\"/\") returns incorrect offset %d",
root_offset);
subnode1_offset = check_subnode(fdt, 0, "subnode1");
subnode2_offset = check_subnode(fdt, 0, "subnode2");