Heather Lee Wilson | bdd62c5 | 2013-12-28 15:12:39 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2008 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | #include <stddef.h> |
| 17 | #include <stdlib.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | typedef struct KeyValue { |
| 21 | unsigned int key; |
| 22 | const char* value; |
| 23 | } KeyValue; |
| 24 | |
| 25 | static KeyValue *key_values = NULL; |
| 26 | static unsigned int number_of_key_values = 0; |
| 27 | |
| 28 | void set_key_values(KeyValue * const new_key_values, |
| 29 | const unsigned int new_number_of_key_values) { |
| 30 | key_values = new_key_values; |
| 31 | number_of_key_values = new_number_of_key_values; |
| 32 | } |
| 33 | |
| 34 | // Compare two key members of KeyValue structures. |
| 35 | int key_value_compare_keys(const void *a, const void *b) { |
| 36 | return (int)((KeyValue*)a)->key - (int)((KeyValue*)b)->key; |
| 37 | } |
| 38 | |
| 39 | // Search an array of key value pairs for the item with the specified value. |
| 40 | KeyValue* find_item_by_value(const char * const value) { |
| 41 | unsigned int i; |
| 42 | for (i = 0; i < number_of_key_values; i++) { |
| 43 | if (strcmp(key_values[i].value, value) == 0) { |
| 44 | return &key_values[i]; |
| 45 | } |
| 46 | } |
| 47 | return NULL; |
| 48 | } |
| 49 | |
| 50 | // Sort an array of key value pairs by key. |
| 51 | void sort_items_by_key() { |
| 52 | qsort(key_values, number_of_key_values, sizeof(*key_values), |
| 53 | key_value_compare_keys); |
| 54 | } |