1 /* 2 * Copyright (C) 2009 The Android Open Source Project 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 17 // 18 // Sortable array of strings. STL-ish, but STL-free. 19 // 20 21 #include <stdlib.h> 22 #include <string.h> 23 24 #include <media/StringArray.h> 25 26 namespace android { 27 28 // 29 // An expanding array of strings. Add, get, sort, delete. 30 // StringArray()31 StringArray::StringArray() 32 : mMax(0), mCurrent(0), mArray(NULL) 33 { 34 } 35 ~StringArray()36 StringArray:: ~StringArray() { 37 for (int i = 0; i < mCurrent; i++) 38 delete[] mArray[i]; 39 delete[] mArray; 40 } 41 42 // 43 // Add a string. A copy of the string is made. 44 // push_back(const char * str)45 bool StringArray::push_back(const char* str) { 46 if (mCurrent >= mMax) { 47 char** tmp; 48 49 if (mMax == 0) 50 mMax = 16; // initial storage 51 else 52 mMax *= 2; 53 54 tmp = new char*[mMax]; 55 if (tmp == NULL) 56 return false; 57 58 memcpy(tmp, mArray, mCurrent * sizeof(char*)); 59 delete[] mArray; 60 mArray = tmp; 61 } 62 63 int len = strlen(str); 64 mArray[mCurrent] = new char[len+1]; 65 memcpy(mArray[mCurrent], str, len+1); 66 mCurrent++; 67 68 return true; 69 } 70 71 // 72 // Delete an entry. 73 // erase(int idx)74 void StringArray::erase(int idx) { 75 if (idx < 0 || idx >= mCurrent) 76 return; 77 delete[] mArray[idx]; 78 if (idx < mCurrent-1) { 79 memmove(&mArray[idx], &mArray[idx+1], 80 (mCurrent-1 - idx) * sizeof(char*)); 81 } 82 mCurrent--; 83 } 84 85 // 86 // Sort the array. 87 // sort(int (* compare)(const void *,const void *))88 void StringArray::sort(int (*compare)(const void*, const void*)) { 89 qsort(mArray, mCurrent, sizeof(char*), compare); 90 } 91 92 // 93 // Pass this to the sort routine to do an ascending alphabetical sort. 94 // cmpAscendingAlpha(const void * pstr1,const void * pstr2)95 int StringArray::cmpAscendingAlpha(const void* pstr1, const void* pstr2) { 96 return strcmp(*(const char**)pstr1, *(const char**)pstr2); 97 } 98 99 // 100 // Set entry N to specified string. 101 // [should use operator[] here] 102 // setEntry(int idx,const char * str)103 void StringArray::setEntry(int idx, const char* str) { 104 if (idx < 0 || idx >= mCurrent) 105 return; 106 delete[] mArray[idx]; 107 int len = strlen(str); 108 mArray[idx] = new char[len+1]; 109 memcpy(mArray[idx], str, len+1); 110 } 111 112 113 } // namespace android 114