builtin/help.c: add --guide option

diff --git a/hash.h b/hash.h
index b875ce67c49eb39a8ca8ad6a688a334985db0534..1d43ac0ba0120e947e40476946360efbdee80a93 100644 (file)
--- a/hash.h
+++ b/hash.h
@@ -40,4 +40,11 @@ static inline void init_hash(struct hash_table *table)
        table->array = NULL;
 }
 
+static inline void preallocate_hash(struct hash_table *table, unsigned int elts)
+{
+       assert(table->size == 0 && table->nr == 0 && table->array == NULL);
+       table->size = elts * 2;
+       table->array = xcalloc(sizeof(struct hash_table_entry), table->size);
+}
+
 #endif