diff options
Diffstat (limited to 'st.c')
| -rw-r--r-- | st.c | 39 |
1 files changed, 39 insertions, 0 deletions
@@ -695,6 +695,45 @@ st_delete_safe(register st_table *table, register st_data_t *key, st_data_t *val return 0; } +int +st_shift(register st_table *table, register st_data_t *key, st_data_t *value) +{ + st_index_t hash_val; + st_table_entry **prev; + register st_table_entry *ptr; + + if (table->num_entries == 0) { + if (value != 0) *value = 0; + return 0; + } + + if (table->entries_packed) { + if (value != 0) *value = (st_data_t)table->bins[1]; + *key = (st_data_t)table->bins[0]; + table->num_entries--; + memmove(&table->bins[0], &table->bins[2], + sizeof(struct st_table_entry*) * 2*table->num_entries); + return 1; + } + + hash_val = do_hash_bin(table->head->key, table); + prev = &table->bins[hash_val]; + for (;(ptr = *prev) != 0; prev = &ptr->next) { + if (ptr == table->head) { + *prev = ptr->next; + REMOVE_ENTRY(table, ptr); + if (value != 0) *value = ptr->record; + *key = ptr->key; + free(ptr); + return 1; + } + } + + /* if hash is not consistent and need to be rehashed */ + if (value != 0) *value = 0; + return 0; +} + void st_cleanup_safe(st_table *table, st_data_t never) { |