ITS#7878 Replace uint32_t with unsigned in back-mdb

init.c: align mi_dbenv_flags and flags with mdb_dbi_open, which declares
flags as unsigned int.

search.c: align mi_rtxn_size with ARG_UINT; adjust ww_ctx.nentries to
silence a warning about signed/unsigned comparison.

config.c: parse checkpoint config more carefully. Reject negative or
unreasonably large values for kbytes and minutes. Ensure both values are
parsed successfully before making any changes.

Fixes a compilation failure under MinGW, where stdint.h types are not
implicitly pulled in by other headers.

servers/slapd/back-mdb/back-mdb.h

@@ -66,9 +66,8 @@ struct mdb_info {
 	MDB_env		*mi_dbenv;
 
 	/* DB_ENV parameters */
-	/* The DB_ENV can be tuned via DB_CONFIG */
 	char		*mi_dbenv_home;
-	uint32_t	mi_dbenv_flags;
+	unsigned	mi_dbenv_flags;
 	int			mi_dbenv_mode;
 
 	size_t		mi_mapsize;
@@ -81,10 +80,10 @@ struct mdb_info {
 	int			mi_search_stack_depth;
 	int			mi_readers;
 
-	uint32_t	mi_rtxn_size;
+	unsigned	mi_rtxn_size;
 	int			mi_txn_cp;
-	uint32_t	mi_txn_cp_min;
-	uint32_t	mi_txn_cp_kbyte;
+	unsigned	mi_txn_cp_min;
+	unsigned	mi_txn_cp_kbyte;
 	struct re_s		*mi_txn_cp_task;
 	struct re_s		*mi_index_task;
 

servers/slapd/back-mdb/config.c

@@ -521,22 +521,22 @@ mdb_cf_gen( ConfigArgs *c )
 		}
 		break;
 	case MDB_CHKPT: {
-		long	l;
-		mdb->mi_txn_cp = 1;
-		if ( lutil_atolx( &l, c->argv[1], 0 ) != 0 ) {
+		unsigned cp_kbyte, cp_min;
+		if ( lutil_atoux( &cp_kbyte, c->argv[1], 0 ) != 0 ) {
 			fprintf( stderr, "%s: "
 				"invalid kbyte \"%s\" in \"checkpoint\".\n",
 				c->log, c->argv[1] );
 			return 1;
 		}
-		mdb->mi_txn_cp_kbyte = l;
-		if ( lutil_atolx( &l, c->argv[2], 0 ) != 0 ) {
+		if ( lutil_atoux( &cp_min, c->argv[2], 0 ) != 0 ) {
 			fprintf( stderr, "%s: "
 				"invalid minutes \"%s\" in \"checkpoint\".\n",
 				c->log, c->argv[2] );
 			return 1;
 		}
-		mdb->mi_txn_cp_min = l;
+		mdb->mi_txn_cp = 1;
+		mdb->mi_txn_cp_kbyte = cp_kbyte;
+		mdb->mi_txn_cp_min = cp_min;
 		/* If we're in server mode and time-based checkpointing is enabled,
 		 * submit a task to perform periodic checkpoints.
 		 */

servers/slapd/back-mdb/init.c

@@ -85,7 +85,7 @@ mdb_db_open( BackendDB *be, ConfigReply *cr )
 	int rc, i;
 	struct mdb_info *mdb = (struct mdb_info *) be->be_private;
 	struct stat stat1;
-	uint32_t flags;
+	unsigned flags;
 	char *dbhome;
 	MDB_txn *txn;
 

servers/slapd/back-mdb/search.c

@@ -331,7 +331,7 @@ typedef struct ww_ctx {
 	ID key;
 	MDB_val data;
 	int flag;
-	int nentries;
+	unsigned nentries;
 } ww_ctx;
 
 /* ITS#7904 if we get blocked while writing results to client,