Fix warnings (#17940)

src/collectors/log2journal/log2journal-yaml.c

@@ -85,7 +85,7 @@ static void yaml_error_with_trace(yaml_parser_t *parser, yaml_event_t *event, si
 #define yaml_parse(parser, event) yaml_parse_with_trace(parser, event, __LINE__, __FUNCTION__, __FILE__)
 static bool yaml_parse_with_trace(yaml_parser_t *parser, yaml_event_t *event, size_t line __maybe_unused, const char *function __maybe_unused, const char *file __maybe_unused) {
     if (!yaml_parser_parse(parser, event)) {
-        yaml_error(parser, NULL, "YAML parser error %d", parser->error);
+        yaml_error(parser, NULL, "YAML parser error %u", parser->error);
         return false;
     }
 

src/collectors/network-viewer.plugin/network-viewer.c

@@ -125,10 +125,10 @@ static void local_socket_to_json_array(BUFFER *wb, LOCAL_SOCKET *n, uint64_t pro
         }
         buffer_json_add_array_item_string(wb, n->network_viewer.remote_address_space);
 
-        uint16_t server_port;
-        const char *server_address;
-        const char *client_address_space;
-        const char *server_address_space;
+        uint16_t server_port = 0;
+        const char *server_address = NULL;
+        const char *client_address_space = NULL;
+        const char *server_address_space = NULL;
         switch (n->direction) {
             case SOCKET_DIRECTION_LISTEN:
             case SOCKET_DIRECTION_INBOUND:

src/collectors/plugins.d/local_listeners.c

@@ -64,7 +64,7 @@ static void print_local_listeners_debug(LS_STATE *ls __maybe_unused, LOCAL_SOCKE
            (n->direction & (SOCKET_DIRECTION_LOCAL_INBOUND|SOCKET_DIRECTION_LOCAL_OUTBOUND)) ? "LOCAL," : "",
            (n->direction == 0) ? "NONE," : "",
            n->pid,
-           n->state,
+           (unsigned int)n->state,
            n->net_ns_inode,
            local_address, n->local.port,
            remote_address, n->remote.port,

src/collectors/proc.plugin/sys_block_zram.c

@@ -128,7 +128,7 @@ static inline void init_rrd(const char *name, ZRAM_DEVICE *d, int update_every)
     rrdlabels_add(d->st_alloc_efficiency->rrdlabels, "device", name, RRDLABEL_SRC_AUTO);
 }
 
-static int init_devices(DICTIONARY *devices, unsigned int zram_id, int update_every) {
+static int init_devices(DICTIONARY *devices, int update_every) {
     int count = 0;
     struct dirent *de;
     struct stat st;
@@ -269,7 +269,7 @@ int do_sys_block_zram(int update_every, usec_t dt) {
         procfile_close(ff);
 
         devices = dictionary_create_advanced(DICT_OPTION_SINGLE_THREADED, &dictionary_stats_category_collectors, 0);
-        device_count = init_devices(devices, (unsigned int)zram_id, update_every);
+        device_count = init_devices(devices, update_every);
     }
 
     if (unlikely(device_count < 1))
@@ -277,4 +277,4 @@ int do_sys_block_zram(int update_every, usec_t dt) {
 
     dictionary_walkthrough_write(devices, collect_zram_metrics, devices);
     return 0;
-}
+}

src/database/KolmogorovSmirnovDist.c

@@ -697,8 +697,8 @@ static double DurbinMatrix (int n, double d)
    k = (int) (n * d) + 1;
    m = 2 * k - 1;
    h = k - n * d;
-   H = (double *) malloc ((m * m) * sizeof (double));
-   Q = (double *) malloc ((m * m) * sizeof (double));
+   H = (double *) calloc ((m * m), sizeof (double));
+   Q = (double *) calloc ((m * m), sizeof (double));
    for (i = 0; i < m; i++)
       for (j = 0; j < m; j++)
          if (i - j + 1 < 0)

src/database/engine/datafile.c

@@ -245,7 +245,7 @@ int create_data_file(struct rrdengine_datafile *datafile)
     uv_fs_t req;
     uv_file file;
     int ret, fd;
-    struct rrdeng_df_sb *superblock;
+    struct rrdeng_df_sb *superblock = NULL;
     uv_buf_t iov;
     char path[RRDENG_PATH_MAX];
 
@@ -291,7 +291,7 @@ int create_data_file(struct rrdengine_datafile *datafile)
 static int check_data_file_superblock(uv_file file)
 {
     int ret;
-    struct rrdeng_df_sb *superblock;
+    struct rrdeng_df_sb *superblock = NULL;
     uv_buf_t iov;
     uv_fs_t req;
 

src/database/engine/dbengine-compression.c

@@ -60,8 +60,11 @@ size_t dbengine_max_compressed_size(size_t uncompressed_size, uint8_t algorithm)
         case RRDENG_COMPRESSION_NONE:
             return uncompressed_size;
 
-        default:
+        default: {
             fatal("DBENGINE: unknown compression algorithm %u", algorithm);
+            //we will never reach this point, but we have warnings from compiler
+            return 0;
+        }
     }
 }
 
@@ -117,8 +120,11 @@ size_t dbengine_compress(void *payload, size_t uncompressed_size, uint8_t algori
         case RRDENG_COMPRESSION_NONE:
             return 0;
 
-        default:
+        default: {
             fatal("DBENGINE: unknown compression algorithm %u", algorithm);
+            //we will never reach this point, but we have warnings from compiler
+            return 0;
+        }
     }
 }
 

src/database/engine/journalfile.c

@@ -573,7 +573,7 @@ int journalfile_create(struct rrdengine_journalfile *journalfile, struct rrdengi
     uv_fs_t req;
     uv_file file;
     int ret, fd;
-    struct rrdeng_jf_sb *superblock;
+    struct rrdeng_jf_sb *superblock = NULL;
     uv_buf_t iov;
     char path[RRDENG_PATH_MAX];
 
@@ -619,7 +619,7 @@ int journalfile_create(struct rrdengine_journalfile *journalfile, struct rrdengi
 static int journalfile_check_superblock(uv_file file)
 {
     int ret;
-    struct rrdeng_jf_sb *superblock;
+    struct rrdeng_jf_sb *superblock = NULL;
     uv_buf_t iov;
     uv_fs_t req;
 
@@ -811,7 +811,7 @@ static uint64_t journalfile_iterate_transactions(struct rrdengine_instance *ctx,
     int ret;
     uint64_t pos, pos_i, max_id, id;
     unsigned size_bytes;
-    void *buf;
+    void *buf = NULL;
     uv_buf_t iov;
     uv_fs_t req;
 

src/database/engine/pdc.c

@@ -1179,7 +1179,7 @@ static bool epdl_populate_pages_from_extent_data(
 
 static inline void *datafile_extent_read(struct rrdengine_instance *ctx, uv_file file, unsigned pos, unsigned size_bytes)
 {
-    void *buffer;
+    void *buffer = NULL;
     uv_fs_t request;
 
     unsigned real_io_size = ALIGN_BYTES_CEILING(size_bytes);

src/health/health_dyncfg.c

@@ -152,7 +152,7 @@ static bool parse_config(json_object *jobj, const char *path, RRD_ALERT_PROTOTYP
 }
 
 static bool parse_prototype(json_object *jobj, const char *path, RRD_ALERT_PROTOTYPE *base, BUFFER *error, const char *name, bool strict) {
-    int64_t version;
+    int64_t version = 0;
     JSONC_PARSE_INT_OR_ERROR_AND_RETURN(jobj, path, "format_version", version, error, strict);
 
     if(version != 1) {