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fdt: Add functions to retrieve strings

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Given a device tree node, a property name and an index, the new function
fdt_stringlist_get() will return a pointer to the index'th string in the
property's value and return its length (or an error code on failure) in
an output argument.

Signed-off-by: Thierry Reding <treding@nvidia.com>
[Fix some -Wshadow warnings --dwg]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Thierry Reding 2015-09-29 11:09:08 +02:00 • committed by David Gibson
parent 8702bd1d3b
commit 604e61e081
3 changed files with 105 additions and 0 deletions
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32
tests/stringlist.c
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@ -58,6 +58,13 @@ static void check_expected_failure(const void *fdt, const char *path,
err = fdt_stringlist_search(fdt, offset, "#address-cells", "");
if (err != 0)
FAIL("empty string not found in #address-cells: %d\n", err);
/*
* fdt_get_string() can successfully extract strings from non-string
* properties. This is because it doesn't necessarily parse the whole
* property value, which would be necessary for it to determine if a
* valid string or string list is present.
*/
}
static void check_string_count(const void *fdt, const char *path,
@ -96,6 +103,27 @@ static void check_string_index(const void *fdt, const char *path,
string, property, path, err, idx);
}
static void check_string(const void *fdt, const char *path,
const char *property, int idx,
const char *string)
{
const char *result;
int offset, len;
offset = fdt_path_offset(fdt, path);
if (offset < 0)
FAIL("Couldn't find path %s", path);
result = fdt_stringlist_get(fdt, offset, property, idx, &len);
if (!result)
FAIL("Couldn't extract string %d from property %s of node %s: %d\n",
idx, property, path, len);
if (strcmp(string, result) != 0)
FAIL("String %d in property %s of node %s is %s, expected %s\n",
idx, property, path, result, string);
}
int main(int argc, char *argv[])
{
void *fdt;
@ -118,5 +146,9 @@ int main(int argc, char *argv[])
check_string_index(fdt, "/device", "compatible", "bar", 1);
check_string_index(fdt, "/device", "big-endian", "baz", -1);
check_string(fdt, "/", "compatible", 0, "test-strings");
check_string(fdt, "/device", "compatible", 0, "foo");
check_string(fdt, "/device", "compatible", 1, "bar");
PASS();
}