1 /*
2 * Copyright (C) 2010 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 #define LOG_TAG "AString"
18 #include <utils/Log.h>
19
20 #include <ctype.h>
21 #include <stdarg.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25
26 #include <utils/String8.h>
27 #include "ADebug.h"
28 #include "AString.h"
29
30 #ifndef __ANDROID_VNDK__
31 #include <binder/Parcel.h>
32 #endif
33
34 namespace android {
35
36 // static
37 constexpr const char *AString::kEmptyString;
38
AString()39 AString::AString()
40 : mData((char *)kEmptyString),
41 mSize(0),
42 mAllocSize(1) {
43 }
44
AString(const char * s)45 AString::AString(const char *s)
46 : mData(NULL),
47 mSize(0),
48 mAllocSize(1) {
49 if (!s) {
50 ALOGW("ctor got NULL, using empty string instead");
51 clear();
52 } else {
53 setTo(s);
54 }
55 }
56
AString(const char * s,size_t size)57 AString::AString(const char *s, size_t size)
58 : mData(NULL),
59 mSize(0),
60 mAllocSize(1) {
61 if (!s) {
62 ALOGW("ctor got NULL, using empty string instead");
63 clear();
64 } else {
65 setTo(s, size);
66 }
67 }
68
AString(const String8 & from)69 AString::AString(const String8 &from)
70 : mData(NULL),
71 mSize(0),
72 mAllocSize(1) {
73 setTo(from.string(), from.length());
74 }
75
AString(const AString & from)76 AString::AString(const AString &from)
77 : mData(NULL),
78 mSize(0),
79 mAllocSize(1) {
80 setTo(from, 0, from.size());
81 }
82
AString(const AString & from,size_t offset,size_t n)83 AString::AString(const AString &from, size_t offset, size_t n)
84 : mData(NULL),
85 mSize(0),
86 mAllocSize(1) {
87 setTo(from, offset, n);
88 }
89
~AString()90 AString::~AString() {
91 clear();
92 }
93
operator =(const AString & from)94 AString &AString::operator=(const AString &from) {
95 if (&from != this) {
96 setTo(from, 0, from.size());
97 }
98
99 return *this;
100 }
101
size() const102 size_t AString::size() const {
103 return mSize;
104 }
105
c_str() const106 const char *AString::c_str() const {
107 return mData;
108 }
109
empty() const110 bool AString::empty() const {
111 return mSize == 0;
112 }
113
setTo(const char * s)114 void AString::setTo(const char *s) {
115 setTo(s, strlen(s));
116 }
117
setTo(const char * s,size_t size)118 void AString::setTo(const char *s, size_t size) {
119 clear();
120 append(s, size);
121 }
122
setTo(const AString & from,size_t offset,size_t n)123 void AString::setTo(const AString &from, size_t offset, size_t n) {
124 CHECK(&from != this);
125
126 clear();
127 setTo(from.mData + offset, n);
128 }
129
clear()130 void AString::clear() {
131 if (mData != kEmptyString) {
132 free(mData);
133 mData = (char *)kEmptyString;
134 }
135 mSize = 0;
136 mAllocSize = 1;
137 }
138
hash() const139 size_t AString::hash() const {
140 size_t x = 0;
141 for (size_t i = 0; i < mSize; ++i) {
142 x = (x * 31) + mData[i];
143 }
144
145 return x;
146 }
147
operator ==(const AString & other) const148 bool AString::operator==(const AString &other) const {
149 return mSize == other.mSize && !memcmp(mData, other.mData, mSize);
150 }
151
trim()152 void AString::trim() {
153 makeMutable();
154
155 size_t i = 0;
156 while (i < mSize && isspace(mData[i])) {
157 ++i;
158 }
159
160 size_t j = mSize;
161 while (j > i && isspace(mData[j - 1])) {
162 --j;
163 }
164
165 memmove(mData, &mData[i], j - i);
166 mSize = j - i;
167 mData[mSize] = '\0';
168 }
169
erase(size_t start,size_t n)170 void AString::erase(size_t start, size_t n) {
171 CHECK_LT(start, mSize);
172 CHECK_LE(start + n, mSize);
173
174 makeMutable();
175
176 memmove(&mData[start], &mData[start + n], mSize - start - n);
177 mSize -= n;
178 mData[mSize] = '\0';
179 }
180
makeMutable()181 void AString::makeMutable() {
182 if (mData == kEmptyString) {
183 mData = strdup(kEmptyString);
184 }
185 }
186
append(const char * s)187 void AString::append(const char *s) {
188 append(s, strlen(s));
189 }
190
append(const char * s,size_t size)191 void AString::append(const char *s, size_t size) {
192 makeMutable();
193
194 if (mSize + size + 1 > mAllocSize) {
195 mAllocSize = (mAllocSize + size + 31) & -32;
196 mData = (char *)realloc(mData, mAllocSize);
197 CHECK(mData != NULL);
198 }
199
200 memcpy(&mData[mSize], s, size);
201 mSize += size;
202 mData[mSize] = '\0';
203 }
204
append(const AString & from)205 void AString::append(const AString &from) {
206 append(from.c_str(), from.size());
207 }
208
append(const AString & from,size_t offset,size_t n)209 void AString::append(const AString &from, size_t offset, size_t n) {
210 append(from.c_str() + offset, n);
211 }
212
append(int x)213 void AString::append(int x) {
214 char s[16];
215 int result = snprintf(s, sizeof(s), "%d", x);
216 CHECK((result > 0) && ((size_t) result) < sizeof(s));
217 append(s);
218 }
219
append(unsigned x)220 void AString::append(unsigned x) {
221 char s[16];
222 int result = snprintf(s, sizeof(s), "%u", x);
223 CHECK((result > 0) && ((size_t) result) < sizeof(s));
224 append(s);
225 }
226
append(long x)227 void AString::append(long x) {
228 char s[32];
229 int result = snprintf(s, sizeof(s), "%ld", x);
230 CHECK((result > 0) && ((size_t) result) < sizeof(s));
231 append(s);
232 }
233
append(unsigned long x)234 void AString::append(unsigned long x) {
235 char s[32];
236 int result = snprintf(s, sizeof(s), "%lu", x);
237 CHECK((result > 0) && ((size_t) result) < sizeof(s));
238 append(s);
239 }
240
append(long long x)241 void AString::append(long long x) {
242 char s[32];
243 int result = snprintf(s, sizeof(s), "%lld", x);
244 CHECK((result > 0) && ((size_t) result) < sizeof(s));
245 append(s);
246 }
247
append(unsigned long long x)248 void AString::append(unsigned long long x) {
249 char s[32];
250 int result = snprintf(s, sizeof(s), "%llu", x);
251 CHECK((result > 0) && ((size_t) result) < sizeof(s));
252 append(s);
253 }
254
append(float x)255 void AString::append(float x) {
256 char s[16];
257 int result = snprintf(s, sizeof(s), "%f", x);
258 CHECK((result > 0) && ((size_t) result) < sizeof(s));
259 append(s);
260 }
261
append(double x)262 void AString::append(double x) {
263 char s[16];
264 int result = snprintf(s, sizeof(s), "%f", x);
265 CHECK((result > 0) && ((size_t) result) < sizeof(s));
266 append(s);
267 }
268
append(void * x)269 void AString::append(void *x) {
270 char s[32];
271 int result = snprintf(s, sizeof(s), "%p", x);
272 CHECK((result > 0) && ((size_t) result) < sizeof(s));
273 append(s);
274 }
275
find(const char * substring,size_t start) const276 ssize_t AString::find(const char *substring, size_t start) const {
277 CHECK_LE(start, size());
278
279 const char *match = strstr(mData + start, substring);
280
281 if (match == NULL) {
282 return -1;
283 }
284
285 return match - mData;
286 }
287
insert(const AString & from,size_t insertionPos)288 void AString::insert(const AString &from, size_t insertionPos) {
289 insert(from.c_str(), from.size(), insertionPos);
290 }
291
insert(const char * from,size_t size,size_t insertionPos)292 void AString::insert(const char *from, size_t size, size_t insertionPos) {
293 CHECK_GE(insertionPos, 0u);
294 CHECK_LE(insertionPos, mSize);
295
296 makeMutable();
297
298 if (mSize + size + 1 > mAllocSize) {
299 mAllocSize = (mAllocSize + size + 31) & -32;
300 mData = (char *)realloc(mData, mAllocSize);
301 CHECK(mData != NULL);
302 }
303
304 memmove(&mData[insertionPos + size],
305 &mData[insertionPos], mSize - insertionPos + 1);
306
307 memcpy(&mData[insertionPos], from, size);
308
309 mSize += size;
310 }
311
operator <(const AString & other) const312 bool AString::operator<(const AString &other) const {
313 return compare(other) < 0;
314 }
315
operator >(const AString & other) const316 bool AString::operator>(const AString &other) const {
317 return compare(other) > 0;
318 }
319
compare(const AString & other) const320 int AString::compare(const AString &other) const {
321 return strcmp(mData, other.mData);
322 }
323
compareIgnoreCase(const AString & other) const324 int AString::compareIgnoreCase(const AString &other) const {
325 return strcasecmp(mData, other.mData);
326 }
327
equalsIgnoreCase(const AString & other) const328 bool AString::equalsIgnoreCase(const AString &other) const {
329 return compareIgnoreCase(other) == 0;
330 }
331
tolower()332 void AString::tolower() {
333 makeMutable();
334
335 for (size_t i = 0; i < mSize; ++i) {
336 mData[i] = ::tolower(mData[i]);
337 }
338 }
339
startsWith(const char * prefix) const340 bool AString::startsWith(const char *prefix) const {
341 return !strncmp(mData, prefix, strlen(prefix));
342 }
343
endsWith(const char * suffix) const344 bool AString::endsWith(const char *suffix) const {
345 size_t suffixLen = strlen(suffix);
346
347 if (mSize < suffixLen) {
348 return false;
349 }
350
351 return !strcmp(mData + mSize - suffixLen, suffix);
352 }
353
startsWithIgnoreCase(const char * prefix) const354 bool AString::startsWithIgnoreCase(const char *prefix) const {
355 return !strncasecmp(mData, prefix, strlen(prefix));
356 }
357
endsWithIgnoreCase(const char * suffix) const358 bool AString::endsWithIgnoreCase(const char *suffix) const {
359 size_t suffixLen = strlen(suffix);
360
361 if (mSize < suffixLen) {
362 return false;
363 }
364
365 return !strcasecmp(mData + mSize - suffixLen, suffix);
366 }
367
368 #ifndef __ANDROID_VNDK__
369 // static
FromParcel(const Parcel & parcel)370 AString AString::FromParcel(const Parcel &parcel) {
371 size_t size = static_cast<size_t>(parcel.readInt32());
372 return AString(static_cast<const char *>(parcel.readInplace(size)), size);
373 }
374
writeToParcel(Parcel * parcel) const375 status_t AString::writeToParcel(Parcel *parcel) const {
376 CHECK_LE(mSize, static_cast<size_t>(INT32_MAX));
377 status_t err = parcel->writeInt32(mSize);
378 if (err == OK) {
379 err = parcel->write(mData, mSize);
380 }
381 return err;
382 }
383 #endif
384
AStringPrintf(const char * format,...)385 AString AStringPrintf(const char *format, ...) {
386 va_list ap;
387 va_start(ap, format);
388
389 char *buffer;
390 vasprintf(&buffer, format, ap);
391
392 va_end(ap);
393
394 AString result(buffer);
395
396 free(buffer);
397 buffer = NULL;
398
399 return result;
400 }
401
402 } // namespace android
403
404