hashtab.h (struct htab): Add member return_allocation_failure.

	* hashtab.h (struct htab): Add member return_allocation_failure.
	(htab_try_create): New prototype.  Mention which functions may
	return NULL when this is used.

From-SVN: r37246

include/ChangeLog

+2000-11-04  Hans-Peter Nilsson  <hp@bitrange.com>
+
+	* hashtab.h (struct htab): Add member return_allocation_failure.
+	(htab_try_create): New prototype.  Mention which functions may
+	return NULL when this is used.
+
 2000-11-03  Hans-Peter Nilsson  <hp@bitrange.com>
 
 	* hashtab.h: Change void * to PTR where necessary.

include/hashtab.h

@@ -98,6 +98,10 @@ struct htab
   /* The following member is used for debugging.  Its value is number
      of collisions fixed for time of work with the hash table. */
   unsigned int collisions;
+
+  /* This is non-zero if we are allowed to return NULL for function calls
+     that allocate memory.  */
+  int return_allocation_failure;
 };
 
 typedef struct htab *htab_t;
@@ -109,6 +113,12 @@ enum insert_option {NO_INSERT, INSERT};
 
 extern htab_t	htab_create	PARAMS ((size_t, htab_hash,
 					 htab_eq, htab_del));
+
+/* This function is like htab_create, but may return NULL if memory
+   allocation fails, and also signals that htab_find_slot_with_hash and
+   htab_find_slot are allowed to return NULL when inserting.  */
+extern htab_t	htab_try_create	PARAMS ((size_t, htab_hash,
+					 htab_eq, htab_del));
 extern void	htab_delete	PARAMS ((htab_t));
 extern void	htab_empty	PARAMS ((htab_t));