[dpdk-dev] kvargs: make pointers in string arrays const
Checks
Commit Message
Change the parameters of functions from const char *valid[] to
const char * const valid[]. This additional const is needed to
allow us to fix some checkpatch warnings, as well as being good
programming practice.
For the checkpatch warnings, if we have a set of command line
args that we want to check defined as:
static const char *args[] = { "arg1", "arg2", NULL };
kvlist = rte_kvargs_parse(params, args);
checkpatch will complain:
WARNING:STATIC_CONST_CHAR_ARRAY: static const char *
array should probably be static const char * const
Adding the additional const to the definition of the args
will then trigger a compiler error in the absense of this
change to the kvargs library, as we lose the const in the
call to kvargs_parse.
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
lib/librte_kvargs/rte_kvargs.c | 8 ++++----
lib/librte_kvargs/rte_kvargs.h | 3 ++-
2 files changed, 6 insertions(+), 5 deletions(-)
Comments
On Thu, 12 Jan 2017 16:18:27 +0000, Bruce Richardson
<bruce.richardson@intel.com> wrote:
> Change the parameters of functions from const char *valid[] to
> const char * const valid[]. This additional const is needed to
> allow us to fix some checkpatch warnings, as well as being good
> programming practice.
>
> For the checkpatch warnings, if we have a set of command line
> args that we want to check defined as:
> static const char *args[] = { "arg1", "arg2", NULL };
> kvlist = rte_kvargs_parse(params, args);
>
> checkpatch will complain:
> WARNING:STATIC_CONST_CHAR_ARRAY: static const char *
> array should probably be static const char * const
>
> Adding the additional const to the definition of the args
> will then trigger a compiler error in the absense of this
> change to the kvargs library, as we lose the const in the
> call to kvargs_parse.
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
2017-01-13 18:44, Olivier Matz:
> On Thu, 12 Jan 2017 16:18:27 +0000, Bruce Richardson
> <bruce.richardson@intel.com> wrote:
> > Change the parameters of functions from const char *valid[] to
> > const char * const valid[]. This additional const is needed to
> > allow us to fix some checkpatch warnings, as well as being good
> > programming practice.
> >
> > For the checkpatch warnings, if we have a set of command line
> > args that we want to check defined as:
> > static const char *args[] = { "arg1", "arg2", NULL };
> > kvlist = rte_kvargs_parse(params, args);
> >
> > checkpatch will complain:
> > WARNING:STATIC_CONST_CHAR_ARRAY: static const char *
> > array should probably be static const char * const
> >
> > Adding the additional const to the definition of the args
> > will then trigger a compiler error in the absense of this
> > change to the kvargs library, as we lose the const in the
> > call to kvargs_parse.
> >
> > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
>
> Acked-by: Olivier Matz <olivier.matz@6wind.com>
Applied, thanks
@@ -92,9 +92,9 @@ rte_kvargs_tokenize(struct rte_kvargs *kvlist, const char *params)
* into a list of valid keys.
*/
static int
-is_valid_key(const char *valid[], const char *key_match)
+is_valid_key(const char * const valid[], const char *key_match)
{
- const char **valid_ptr;
+ const char * const *valid_ptr;
for (valid_ptr = valid; *valid_ptr != NULL; valid_ptr++) {
if (strcmp(key_match, *valid_ptr) == 0)
@@ -109,7 +109,7 @@ is_valid_key(const char *valid[], const char *key_match)
*/
static int
check_for_valid_keys(struct rte_kvargs *kvlist,
- const char *valid[])
+ const char * const valid[])
{
unsigned i, ret;
struct rte_kvargs_pair *pair;
@@ -187,7 +187,7 @@ rte_kvargs_free(struct rte_kvargs *kvlist)
* check if only valid keys were used.
*/
struct rte_kvargs *
-rte_kvargs_parse(const char *args, const char *valid_keys[])
+rte_kvargs_parse(const char *args, const char * const valid_keys[])
{
struct rte_kvargs *kvlist;
@@ -97,7 +97,8 @@ struct rte_kvargs {
* - A pointer to an allocated rte_kvargs structure on success
* - NULL on error
*/
-struct rte_kvargs *rte_kvargs_parse(const char *args, const char *valid_keys[]);
+struct rte_kvargs *rte_kvargs_parse(const char *args,
+ const char *const valid_keys[]);
/**
* Free a rte_kvargs structure