libfdt: Several cleanups to parameter checking
This patch makes a couple of small cleanups to parameter checking of
libfdt functions.
- In several functions which take a node offset, we use an
idiom involving fdt_next_tag() first to check that we have indeed been
given a node offset. This patch adds a helper function
_fdt_check_node_offset() to encapsulate this usage of fdt_next_tag().
- In fdt_rw.c in several places we have the expanded version
of the RW_CHECK_HEADER() macro for no particular reason. This patch
replaces those instances with an invocation of the macro; that's what
it's for.
- In fdt_sw.c we rename the check_header_sw() function to
sw_check_header() to match the analgous function in fdt_rw.c, and we
provide an SW_CHECK_HEADER() wrapper macro as RW_CHECK_HEADER()
functions in fdt_rw.c
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/libfdt/fdt_rw.c b/libfdt/fdt_rw.c
index 8609fa7..95a5c2c 100644
--- a/libfdt/fdt_rw.c
+++ b/libfdt/fdt_rw.c
@@ -176,8 +176,7 @@
struct fdt_reserve_entry *re;
int err;
- if ((err = rw_check_header(fdt)))
- return err;
+ RW_CHECK_HEADER(fdt);
re = _fdt_mem_rsv_w(fdt, fdt_num_mem_rsv(fdt));
err = _blob_splice_mem_rsv(fdt, re, 0, 1);
@@ -194,8 +193,8 @@
struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
int err;
- if ((err = rw_check_header(fdt)))
- return err;
+ RW_CHECK_HEADER(fdt);
+
if (n >= fdt_num_mem_rsv(fdt))
return -FDT_ERR_NOTFOUND;
@@ -227,15 +226,13 @@
static int _add_property(void *fdt, int nodeoffset, const char *name, int len,
struct fdt_property **prop)
{
- uint32_t tag;
int proplen;
int nextoffset;
int namestroff;
int err;
- tag = fdt_next_tag(fdt, nodeoffset, &nextoffset);
- if (tag != FDT_BEGIN_NODE)
- return -FDT_ERR_BADOFFSET;
+ if ((nextoffset = _fdt_check_node_offset(fdt, nodeoffset)) < 0)
+ return nextoffset;
namestroff = _find_add_string(fdt, name);
if (namestroff < 0)
@@ -260,8 +257,7 @@
int oldlen, newlen;
int err;
- if ((err = rw_check_header(fdt)))
- return err;
+ RW_CHECK_HEADER(fdt);
namep = (char *)fdt_get_name(fdt, nodeoffset, &oldlen);
if (!namep)
@@ -284,8 +280,7 @@
struct fdt_property *prop;
int err;
- if ((err = rw_check_header(fdt)))
- return err;
+ RW_CHECK_HEADER(fdt);
err = _resize_property(fdt, nodeoffset, name, len, &prop);
if (err == -FDT_ERR_NOTFOUND)
@@ -456,11 +451,8 @@
int fdt_pack(void *fdt)
{
int mem_rsv_size;
- int err;
- err = rw_check_header(fdt);
- if (err)
- return err;
+ RW_CHECK_HEADER(fdt);
mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
* sizeof(struct fdt_reserve_entry);