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 "StringArray.h"
25
26namespace android {
27
28//
29// An expanding array of strings.  Add, get, sort, delete.
30//
31StringArray::StringArray()
32    : mMax(0), mCurrent(0), mArray(NULL)
33{
34}
35
36StringArray:: ~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//
45bool 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//
74void 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//
88void 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//
95int 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//
103void 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