aft: Unify handling of hash and path duplicates.

These are symmetric but were not treated as such. Specifically:

	* We ignored fatal errors for finding hash sisters while path
	brothers were handled strictly.

	* For hash sisters, we had a helper which implicitly special
	cased the non-fatal E_OSL_RB_KEY_NOT_FOUND case while the
	same check was open-coded for path brothers.

This adds the find_path_brother() helper which is analogous to
find_hash_sister() and fixes up the latter function to perform strict
error checking rather than relying on the implementation detail that
osl_get_row() sets the result pointer to NULL if no entry was found.

diff --git a/aft.c b/aft.c
index 47931656a019b2eb3d548af7332fd5e17a138111..bfa4ce1ab7e29f56a418abdeb574aa4526e29c57 100644 (file)
--- a/aft.c
+++ b/aft.c
@@ -1477,13 +1477,22 @@ int audio_file_loop(void *private_data, osl_rbtree_loop_func *func)
                func));
 }
 
-static struct osl_row *find_hash_sister(unsigned char *hash)
+static int find_hash_sister(unsigned char *hash, struct osl_row **result)
 {
-       const struct osl_object obj = {.data = hash, .size = HASH_SIZE};
-       struct osl_row *row;
+       int ret = aft_get_row_of_hash(hash, result);
 
-       osl_get_row(audio_file_table, AFTCOL_HASH, &obj, &row);
-       return row;
+       if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
+               return 0;
+       return ret;
+}
+
+static int find_path_brother(const char *path, struct osl_row **result)
+{
+       int ret = aft_get_row_of_path(path, result);
+
+       if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
+               return 0;
+       return ret;
 }
 
 /** The format of the data stored by save_audio_file_data(). */
@@ -1630,9 +1639,11 @@ static int com_add_callback(struct afs_callback_arg *aca)
        objs[AFTCOL_PATH].size = strlen(path) + 1;
 
        PARA_INFO_LOG("request to add %s\n", path);
-       hs = find_hash_sister(hash);
-       ret = aft_get_row_of_path(path, &pb);
-       if (ret < 0 && ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
+       ret = find_hash_sister(hash, &hs);
+       if (ret < 0)
+               goto out;
+       ret = find_path_brother(path, &pb);
+       if (ret < 0)
                goto out;
        if (hs && pb && hs == pb && !(flags & ADD_FLAG_FORCE)) {
                if (flags & ADD_FLAG_VERBOSE)
@@ -1746,8 +1757,8 @@ static int path_brother_callback(struct afs_callback_arg *aca)
 {
        char *path = aca->query.data;
        struct osl_row *path_brother;
-       int ret = aft_get_row_of_path(path, &path_brother);
-       if (ret < 0)
+       int ret = find_path_brother(path, &path_brother);
+       if (ret <= 0)
                return ret;
        return pass_buffer_as_shm(aca->fd, SBD_OUTPUT, (char *)&path_brother,
                sizeof(path_brother));
@@ -1757,10 +1768,10 @@ static int hash_sister_callback(struct afs_callback_arg *aca)
 {
        unsigned char *hash = aca->query.data;
        struct osl_row *hash_sister;
+       int ret = find_hash_sister(hash, &hash_sister);
 
-       hash_sister = find_hash_sister(hash);
-       if (!hash_sister)
-               return 0;
+       if (ret <= 0)
+               return ret;
        return pass_buffer_as_shm(aca->fd, SBD_OUTPUT, (char *)&hash_sister,
                sizeof(hash_sister));
 }