Fix various typos in code comments.

Via GitHub #687.

configfile.c

@@ -1889,7 +1889,7 @@ modify_auto_conf(const char *data_dir, KeyValueList *items)
 			/*
 			 * Note: durable_rename() is not exposed to frontend code before Pg 10.
 			 * We only really need to be modifying postgresql.auto.conf from Pg 12,
-			 * but provide backwards compatibitilty for Pg 9.6 and earlier for the
+			 * but provide backwards compatibility for Pg 9.6 and earlier for the
 			 * (unlikely) event that a repmgr built against one of those versions
 			 * is being used against Pg 12 and later.
 			 */

configfile.h

@@ -249,7 +249,7 @@ typedef struct
 	/*
 	 * undocumented settings
 	 *
-	 * These settings are for testing or experimential features
+	 * These settings are for testing or experimental features
 	 * and may be changed without notice.
 	 */
 

controldata.c

@@ -2,7 +2,7 @@
  * controldata.c - functions for reading the pg_control file
  *
  * The functions provided here enable repmgr to read a pg_control file
- * in a version-indepent way, even if the PostgreSQL instance is not
+ * in a version-independent way, even if the PostgreSQL instance is not
  * running. For that reason we can't use on the pg_control_*() functions
  * provided in PostgreSQL 9.6 and later.
  *

dbutils.c

@@ -4825,7 +4825,7 @@ cancel_query(PGconn *conn, int timeout)
  * Wait until current query finishes, ignoring any results.
  * Usually this will be an async query or query cancellation.
  *
- * Returns 1 for success; 0 if any error ocurred; -1 if timeout reached.
+ * Returns 1 for success; 0 if any error occurred; -1 if timeout reached.
  */
 int
 wait_connection_availability(PGconn *conn, int timeout)

dirutil.c

@@ -205,7 +205,7 @@ mkdir_p(char *path, mode_t omode)
 			/*
 			 * POSIX 1003.2: For each dir operand that does not name an
 			 * existing directory, effects equivalent to those caused by the
-			 * following command shall occcur:
+			 * following command shall occur:
 			 *
 			 * mkdir -p -m $(umask -S),u+wx $(dirname dir) && mkdir [-m mode]
 			 * dir
@@ -289,7 +289,7 @@ is_pg_running(const char *path)
 	{
 		/*
 		 * No PID file - PostgreSQL shouldn't be running. From 9.3 (the
-		 * earliesty version we care about) removal of the PID file will
+		 * earliest version we care about) removal of the PID file will
 		 * cause the postmaster to shut down, so it's highly unlikely
 		 * that PostgreSQL will still be running.
 		 */

repmgr-action-standby.c

@@ -1932,7 +1932,7 @@ do_standby_register(void)
 	/*
 	 * If --upstream-node-id not provided, we're defaulting to the primary as
 	 * upstream node. If local node is available, double-check that it's attached
-	 * to the primary, in case --upstream-node-id was an accidental ommission.
+	 * to the primary, in case --upstream-node-id was an accidental omission.
 	 *
 	 * Currently we'll only do this for newly registered nodes.
 	 */
@@ -3395,7 +3395,7 @@ do_standby_follow_internal(PGconn *primary_conn, PGconn *follow_target_conn, t_n
 					goto cleanup;
 				}
 
-				/* In the unlikley event that fails, we'll fall back to a restart */
+				/* In the unlikely event that fails, we'll fall back to a restart */
 				log_warning(_("unable to reload server configuration"));
 			}
 
@@ -3626,7 +3626,7 @@ do_standby_switchover(void)
 	 * SANITY CHECKS
 	 *
 	 * We'll be doing a bunch of operations on the remote server (primary to
-	 * be demoted) - careful checks needed before proceding.
+	 * be demoted) - careful checks needed before proceeding.
 	 */
 
 	local_conn = establish_db_connection(config_file_options.conninfo, true);

repmgr-client.c

@@ -122,7 +122,7 @@ main(int argc, char **argv)
 	/*
 	 * Tell the logger we're a command-line program - this will ensure any
 	 * output logged before the logger is initialized will be formatted
-	 * correctly. Can be overriden with "--log-to-file".
+	 * correctly. Can be overridden with "--log-to-file".
 	 */
 	logger_output_mode = OM_COMMAND_LINE;
 
@@ -2735,7 +2735,7 @@ do_help(void)
  *
  * Note:
  *   This is one of two places where superuser rights are required.
- *   We should also consider possible scenarious where a non-superuser
+ *   We should also consider possible scenarios where a non-superuser
  *   has sufficient privileges to install the extension.
  */
 
@@ -2936,7 +2936,7 @@ check_server_version(PGconn *conn, char *server_type, bool exit_on_error, char *
 	 * PostgreSQL from a particular PostgreSQL release onwards (e.g. 4.4 with PostgreSQL
 	 * 12 and later due to recovery.conf removal), set MAX_UNSUPPORTED_VERSION and
 	 * MAX_UNSUPPORTED_VERSION_NUM in "repmgr.h" to define the first PostgreSQL
-	 * version which can't be suppored.
+	 * version which can't be supported.
 	 */
 #ifdef MAX_UNSUPPORTED_VERSION_NUM
 	if (conn_server_version_num >= MAX_UNSUPPORTED_VERSION_NUM)

repmgrd-physical.c

@@ -737,7 +737,7 @@ check_primary_status(int degraded_monitoring_elapsed)
 			/* refresh our copy of the node record from the primary */
 			record_status = get_node_record(new_primary_conn, config_file_options.node_id, &local_node_info);
 
-			/* this is unlikley to happen */
+			/* this is unlikely to happen */
 			if (record_status != RECORD_FOUND)
 			{
 				log_warning(_("unable to retrieve local node record from primary node %i"), primary_node_id);
@@ -1111,7 +1111,7 @@ execute_child_nodes_disconnect_command(NodeInfoList *db_child_node_records, t_ch
 	/* calculate number of connected child nodes */
 	for (cell = db_child_node_records->head; cell; cell = cell->next)
 	{
-		/* exclude witness server from total, if necessay */
+		/* exclude witness server from total, if necessary */
 		if (config_file_options.child_nodes_connected_include_witness == false &&
 			cell->node_info->type == WITNESS)
 			continue;
@@ -1149,7 +1149,7 @@ execute_child_nodes_disconnect_command(NodeInfoList *db_child_node_records, t_ch
 				instr_time  current_time = current_time_base;
 				int seconds_since_detached;
 
-				/* exclude witness server from calculatin if neccessary */
+				/* exclude witness server from calculating if necessary */
 				if (config_file_options.child_nodes_connected_include_witness == false &&
 					child_node_rec->type == WITNESS)
 					continue;
@@ -3254,7 +3254,7 @@ update_monitoring_history(void)
  *
  * Attach cascaded standby to another node, currently the primary.
  *
- * Note that in contrast to a primary failover, where one of the downstrean
+ * Note that in contrast to a primary failover, where one of the downstream
  * standby nodes will become a primary, a cascaded standby failover (where the
  * upstream standby has gone away) is "just" a case of attaching the standby to
  * another node.

repmgrd.c

@@ -249,7 +249,7 @@ main(int argc, char **argv)
 	/*
 	 * Parse the configuration file, if provided (if no configuration file was
 	 * provided, an attempt will be made to find one in one of the default
-	 * locations). If no conifguration file is available, or it can't be parsed
+	 * locations). If no configuration file is available, or it can't be parsed
 	 * parse_config() will abort anyway, with an appropriate message.
 	 */
 	load_config(config_file, verbose, false, argv[0]);
@@ -307,7 +307,7 @@ main(int argc, char **argv)
 	}
 
 
-	/* Some configuration file items can be overriden by command line options */
+	/* Some configuration file items can be overridden by command line options */
 
 	/*
 	 * Command-line parameter -L/--log-level overrides any setting in config