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From Julian Foad <julianf...@btopenworld.com>
Subject [PATCH] Simplify and constify the new apr_hash_this_{key,key_len,val} functions
Date Wed, 23 Jan 2013 15:15:04 GMT
Dear APR devs,

Following the relatively recent addition to APR trunk [1,2,3] of these functions:

  const char * apr_hash_this_key(apr_hash_index_t *);
  apr_ssize_t  apr_hash_this_key_len(apr_hash_index_t *);
  void *       apr_hash_this_val(apr_hash_index_t *);

I offer the attached patch as a simple and obvious improvement.

Log message:
[[[
Constify and simplify some hash indexing functions.

* include/apr_hash.h
  (apr_hash_this_key, apr_hash_this_key_len, apr_hash_this_val): Constify
    the hash index parameter.

* tables/apr_hash.c
  (apr_hash_this_key, apr_hash_this_key_len, apr_hash_this_val): Simplify.
]]]

Patch (in case the attachment is hard to read):
[[[
Index: include/apr_hash.h
===================================================================
--- include/apr_hash.h  (revision 1432927)
+++ include/apr_hash.h  (working copy)
@@ -171,21 +171,21 @@ APR_DECLARE(void) apr_hash_this(apr_hash
  * @param hi The iteration state
  * @return The pointer to the key
  */
-APR_DECLARE(const void*) apr_hash_this_key(apr_hash_index_t *hi);
+APR_DECLARE(const void *) apr_hash_this_key(const apr_hash_index_t *hi);

 /**
  * Get the current entry's key length from the iteration state.
  * @param hi The iteration state
  * @return The key length
  */
-APR_DECLARE(apr_ssize_t) apr_hash_this_key_len(apr_hash_index_t *hi);
+APR_DECLARE(apr_ssize_t) apr_hash_this_key_len(const apr_hash_index_t *hi);

 /**
  * Get the current entry's value from the iteration state.
  * @param hi The iteration state
  * @return The pointer to the value
  */
-APR_DECLARE(void*) apr_hash_this_val(apr_hash_index_t *hi);
+APR_DECLARE(void *) apr_hash_this_val(const apr_hash_index_t *hi);

 /**
  * Get the number of key/value pairs in the hash table.
Index: tables/apr_hash.c
===================================================================
--- tables/apr_hash.c   (revision 1432927)
+++ tables/apr_hash.c   (working copy)
@@ -162,28 +162,19 @@ APR_DECLARE(void) apr_hash_this(apr_hash
     if (val)  *val  = (void *)hi->this->val;
 }

-APR_DECLARE(const void *) apr_hash_this_key(apr_hash_index_t *hi)
+APR_DECLARE(const void *) apr_hash_this_key(const apr_hash_index_t *hi)
 {
-    const void *key;
-
-    apr_hash_this(hi, &key, NULL, NULL);
-    return key;
+    return hi->this->key;
 }

-APR_DECLARE(apr_ssize_t) apr_hash_this_key_len(apr_hash_index_t *hi)
+APR_DECLARE(apr_ssize_t) apr_hash_this_key_len(const apr_hash_index_t *hi)
 {
-    apr_ssize_t klen;
-
-    apr_hash_this(hi, NULL, &klen, NULL);
-    return klen;
+    return hi->this->klen;
 }

-APR_DECLARE(void *) apr_hash_this_val(apr_hash_index_t *hi)
+APR_DECLARE(void *) apr_hash_this_val(const apr_hash_index_t *hi)
 {
-    void *val;
-
-    apr_hash_this(hi, NULL, NULL, &val);
-    return val;
+    return (void *)hi->this->val;
 }

 /*
]]]

- Julian


[1] tracked as: <https://issues.apache.org/bugzilla/show_bug.cgi?id=49065>

[2] committed as: <http://svn.apache.org/viewvc?view=revision&revision=931973>

[3] discussed at: <http://mail-archives.apache.org/mod_mbox/apr-dev/201003.mbox/%3C4B96A8EF.8030401%40rowe-clan.net%3E>
in the thread found at <http://mail-archives.apache.org/mod_mbox/apr-dev/201003.mbox/browser>;
search for "[PATCH] apr_hash_this_{key,klen,val}".
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