summaryrefslogtreecommitdiffstats
blob: 8d318f77fe350664aeff893b59d0f5ad3c79d1f4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
/*
 * Copyright (C) 2005 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define __STDC_LIMIT_MACROS
#include <stdint.h>

#include <utils/String8.h>

#include <utils/Compat.h>
#include <utils/Log.h>
#include <utils/String16.h>

#include <ctype.h>

#include "SharedBuffer.h"

/*
 * Functions outside android is below the namespace android, since they use
 * functions and constants in android namespace.
 */

// ---------------------------------------------------------------------------

namespace android {

// Separator used by resource paths. This is not platform dependent contrary
// to OS_PATH_SEPARATOR.
#define RES_PATH_SEPARATOR '/'

static inline char* getEmptyString() {
    static SharedBuffer* gEmptyStringBuf = [] {
        SharedBuffer* buf = SharedBuffer::alloc(1);
        char* str = static_cast<char*>(buf->data());
        *str = 0;
        return buf;
    }();

    gEmptyStringBuf->acquire();
    return static_cast<char*>(gEmptyStringBuf->data());
}

// ---------------------------------------------------------------------------

static char* allocFromUTF8(const char* in, size_t len)
{
    if (len > 0) {
        if (len == SIZE_MAX) {
            return nullptr;
        }
        SharedBuffer* buf = SharedBuffer::alloc(len+1);
        ALOG_ASSERT(buf, "Unable to allocate shared buffer");
        if (buf) {
            char* str = (char*)buf->data();
            memcpy(str, in, len);
            str[len] = 0;
            return str;
        }
        return nullptr;
    }

    return getEmptyString();
}

static char* allocFromUTF16(const char16_t* in, size_t len)
{
    if (len == 0) return getEmptyString();

     // Allow for closing '\0'
    const ssize_t resultStrLen = utf16_to_utf8_length(in, len) + 1;
    if (resultStrLen < 1) {
        return getEmptyString();
    }

    SharedBuffer* buf = SharedBuffer::alloc(resultStrLen);
    ALOG_ASSERT(buf, "Unable to allocate shared buffer");
    if (!buf) {
        return getEmptyString();
    }

    char* resultStr = (char*)buf->data();
    utf16_to_utf8(in, len, resultStr, resultStrLen);
    return resultStr;
}

static char* allocFromUTF32(const char32_t* in, size_t len)
{
    if (len == 0) {
        return getEmptyString();
    }

    const ssize_t resultStrLen = utf32_to_utf8_length(in, len) + 1;
    if (resultStrLen < 1) {
        return getEmptyString();
    }

    SharedBuffer* buf = SharedBuffer::alloc(resultStrLen);
    ALOG_ASSERT(buf, "Unable to allocate shared buffer");
    if (!buf) {
        return getEmptyString();
    }

    char* resultStr = (char*) buf->data();
    utf32_to_utf8(in, len, resultStr, resultStrLen);

    return resultStr;
}

// ---------------------------------------------------------------------------

String8::String8()
    : mString(getEmptyString())
{
}

String8::String8(StaticLinkage)
    : mString(nullptr)
{
    // this constructor is used when we can't rely on the static-initializers
    // having run. In this case we always allocate an empty string. It's less
    // efficient than using getEmptyString(), but we assume it's uncommon.

    char* data = static_cast<char*>(
            SharedBuffer::alloc(sizeof(char))->data());
    data[0] = 0;
    mString = data;
}

String8::String8(const String8& o)
    : mString(o.mString)
{
    SharedBuffer::bufferFromData(mString)->acquire();
}

String8::String8(const char* o)
    : mString(allocFromUTF8(o, strlen(o)))
{
    if (mString == nullptr) {
        mString = getEmptyString();
    }
}

String8::String8(const char* o, size_t len)
    : mString(allocFromUTF8(o, len))
{
    if (mString == nullptr) {
        mString = getEmptyString();
    }
}

String8::String8(const String16& o)
    : mString(allocFromUTF16(o.string(), o.size()))
{
}

String8::String8(const char16_t* o)
    : mString(allocFromUTF16(o, strlen16(o)))
{
}

String8::String8(const char16_t* o, size_t len)
    : mString(allocFromUTF16(o, len))
{
}

String8::String8(const char32_t* o)
    : mString(allocFromUTF32(o, strlen32(o)))
{
}

String8::String8(const char32_t* o, size_t len)
    : mString(allocFromUTF32(o, len))
{
}

String8::~String8()
{
    SharedBuffer::bufferFromData(mString)->release();
}

size_t String8::length() const
{
    return SharedBuffer::sizeFromData(mString)-1;
}

String8 String8::format(const char* fmt, ...)
{
    va_list args;
    va_start(args, fmt);

    String8 result(formatV(fmt, args));

    va_end(args);
    return result;
}

String8 String8::formatV(const char* fmt, va_list args)
{
    String8 result;
    result.appendFormatV(fmt, args);
    return result;
}

void String8::clear() {
    SharedBuffer::bufferFromData(mString)->release();
    mString = getEmptyString();
}

void String8::setTo(const String8& other)
{
    SharedBuffer::bufferFromData(other.mString)->acquire();
    SharedBuffer::bufferFromData(mString)->release();
    mString = other.mString;
}

status_t String8::setTo(const char* other)
{
    const char *newString = allocFromUTF8(other, strlen(other));
    SharedBuffer::bufferFromData(mString)->release();
    mString = newString;
    if (mString) return NO_ERROR;

    mString = getEmptyString();
    return NO_MEMORY;
}

status_t String8::setTo(const char* other, size_t len)
{
    const char *newString = allocFromUTF8(other, len);
    SharedBuffer::bufferFromData(mString)->release();
    mString = newString;
    if (mString) return NO_ERROR;

    mString = getEmptyString();
    return NO_MEMORY;
}

status_t String8::setTo(const char16_t* other, size_t len)
{
    const char *newString = allocFromUTF16(other, len);
    SharedBuffer::bufferFromData(mString)->release();
    mString = newString;
    if (mString) return NO_ERROR;

    mString = getEmptyString();
    return NO_MEMORY;
}

status_t String8::setTo(const char32_t* other, size_t len)
{
    const char *newString = allocFromUTF32(other, len);
    SharedBuffer::bufferFromData(mString)->release();
    mString = newString;
    if (mString) return NO_ERROR;

    mString = getEmptyString();
    return NO_MEMORY;
}

status_t String8::append(const String8& other)
{
    const size_t otherLen = other.bytes();
    if (bytes() == 0) {
        setTo(other);
        return NO_ERROR;
    } else if (otherLen == 0) {
        return NO_ERROR;
    }

    return real_append(other.string(), otherLen);
}

status_t String8::append(const char* other)
{
    return append(other, strlen(other));
}

status_t String8::append(const char* other, size_t otherLen)
{
    if (bytes() == 0) {
        return setTo(other, otherLen);
    } else if (otherLen == 0) {
        return NO_ERROR;
    }

    return real_append(other, otherLen);
}

status_t String8::appendFormat(const char* fmt, ...)
{
    va_list args;
    va_start(args, fmt);

    status_t result = appendFormatV(fmt, args);

    va_end(args);
    return result;
}

status_t String8::appendFormatV(const char* fmt, va_list args)
{
    int n, result = NO_ERROR;
    va_list tmp_args;

    /* args is undefined after vsnprintf.
     * So we need a copy here to avoid the
     * second vsnprintf access undefined args.
     */
    va_copy(tmp_args, args);
    n = vsnprintf(nullptr, 0, fmt, tmp_args);
    va_end(tmp_args);

    if (n != 0) {
        size_t oldLength = length();
        char* buf = lockBuffer(oldLength + n);
        if (buf) {
            vsnprintf(buf + oldLength, n + 1, fmt, args);
        } else {
            result = NO_MEMORY;
        }
    }
    return result;
}

status_t String8::real_append(const char* other, size_t otherLen)
{
    const size_t myLen = bytes();

    SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
        ->editResize(myLen+otherLen+1);
    if (buf) {
        char* str = (char*)buf->data();
        mString = str;
        str += myLen;
        memcpy(str, other, otherLen);
        str[otherLen] = '\0';
        return NO_ERROR;
    }
    return NO_MEMORY;
}

char* String8::lockBuffer(size_t size)
{
    SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
        ->editResize(size+1);
    if (buf) {
        char* str = (char*)buf->data();
        mString = str;
        return str;
    }
    return nullptr;
}

void String8::unlockBuffer()
{
    unlockBuffer(strlen(mString));
}

status_t String8::unlockBuffer(size_t size)
{
    if (size != this->size()) {
        SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
            ->editResize(size+1);
        if (! buf) {
            return NO_MEMORY;
        }

        char* str = (char*)buf->data();
        str[size] = 0;
        mString = str;
    }

    return NO_ERROR;
}

ssize_t String8::find(const char* other, size_t start) const
{
    size_t len = size();
    if (start >= len) {
        return -1;
    }
    const char* s = mString+start;
    const char* p = strstr(s, other);
    return p ? p-mString : -1;
}

bool String8::removeAll(const char* other) {
    ssize_t index = find(other);
    if (index < 0) return false;

    char* buf = lockBuffer(size());
    if (!buf) return false; // out of memory

    size_t skip = strlen(other);
    size_t len = size();
    size_t tail = index;
    while (size_t(index) < len) {
        ssize_t next = find(other, index + skip);
        if (next < 0) {
            next = len;
        }

        memmove(buf + tail, buf + index + skip, next - index - skip);
        tail += next - index - skip;
        index = next;
    }
    unlockBuffer(tail);
    return true;
}

void String8::toLower()
{
    toLower(0, size());
}

void String8::toLower(size_t start, size_t length)
{
    const size_t len = size();
    if (start >= len) {
        return;
    }
    if (start+length > len) {
        length = len-start;
    }
    char* buf = lockBuffer(len);
    buf += start;
    while (length > 0) {
        *buf = tolower(*buf);
        buf++;
        length--;
    }
    unlockBuffer(len);
}

void String8::toUpper()
{
    toUpper(0, size());
}

void String8::toUpper(size_t start, size_t length)
{
    const size_t len = size();
    if (start >= len) {
        return;
    }
    if (start+length > len) {
        length = len-start;
    }
    char* buf = lockBuffer(len);
    buf += start;
    while (length > 0) {
        *buf = toupper(*buf);
        buf++;
        length--;
    }
    unlockBuffer(len);
}

size_t String8::getUtf32Length() const
{
    return utf8_to_utf32_length(mString, length());
}

int32_t String8::getUtf32At(size_t index, size_t *next_index) const
{
    return utf32_from_utf8_at(mString, length(), index, next_index);
}

void String8::getUtf32(char32_t* dst) const
{
    utf8_to_utf32(mString, length(), dst);
}

// ---------------------------------------------------------------------------
// Path functions

void String8::setPathName(const char* name)
{
    setPathName(name, strlen(name));
}

void String8::setPathName(const char* name, size_t len)
{
    char* buf = lockBuffer(len);

    memcpy(buf, name, len);

    // remove trailing path separator, if present
    if (len > 0 && buf[len-1] == OS_PATH_SEPARATOR)
        len--;

    buf[len] = '\0';

    unlockBuffer(len);
}

String8 String8::getPathLeaf(void) const
{
    const char* cp;
    const char*const buf = mString;

    cp = strrchr(buf, OS_PATH_SEPARATOR);
    if (cp == nullptr)
        return String8(*this);
    else
        return String8(cp+1);
}

String8 String8::getPathDir(void) const
{
    const char* cp;
    const char*const str = mString;

    cp = strrchr(str, OS_PATH_SEPARATOR);
    if (cp == nullptr)
        return String8("");
    else
        return String8(str, cp - str);
}

String8 String8::walkPath(String8* outRemains) const
{
    const char* cp;
    const char*const str = mString;
    const char* buf = str;

    cp = strchr(buf, OS_PATH_SEPARATOR);
    if (cp == buf) {
        // don't include a leading '/'.
        buf = buf+1;
        cp = strchr(buf, OS_PATH_SEPARATOR);
    }

    if (cp == nullptr) {
        String8 res = buf != str ? String8(buf) : *this;
        if (outRemains) *outRemains = String8("");
        return res;
    }

    String8 res(buf, cp-buf);
    if (outRemains) *outRemains = String8(cp+1);
    return res;
}

/*
 * Helper function for finding the start of an extension in a pathname.
 *
 * Returns a pointer inside mString, or NULL if no extension was found.
 */
char* String8::find_extension(void) const
{
    const char* lastSlash;
    const char* lastDot;
    const char* const str = mString;

    // only look at the filename
    lastSlash = strrchr(str, OS_PATH_SEPARATOR);
    if (lastSlash == nullptr)
        lastSlash = str;
    else
        lastSlash++;

    // find the last dot
    lastDot = strrchr(lastSlash, '.');
    if (lastDot == nullptr)
        return nullptr;

    // looks good, ship it
    return const_cast<char*>(lastDot);
}

String8 String8::getPathExtension(void) const
{
    char* ext;

    ext = find_extension();
    if (ext != nullptr)
        return String8(ext);
    else
        return String8("");
}

String8 String8::getBasePath(void) const
{
    char* ext;
    const char* const str = mString;

    ext = find_extension();
    if (ext == nullptr)
        return String8(*this);
    else
        return String8(str, ext - str);
}

String8& String8::appendPath(const char* name)
{
    // TODO: The test below will fail for Win32 paths. Fix later or ignore.
    if (name[0] != OS_PATH_SEPARATOR) {
        if (*name == '\0') {
            // nothing to do
            return *this;
        }

        size_t len = length();
        if (len == 0) {
            // no existing filename, just use the new one
            setPathName(name);
            return *this;
        }

        // make room for oldPath + '/' + newPath
        int newlen = strlen(name);

        char* buf = lockBuffer(len+1+newlen);

        // insert a '/' if needed
        if (buf[len-1] != OS_PATH_SEPARATOR)
            buf[len++] = OS_PATH_SEPARATOR;

        memcpy(buf+len, name, newlen+1);
        len += newlen;

        unlockBuffer(len);

        return *this;
    } else {
        setPathName(name);
        return *this;
    }
}

String8& String8::convertToResPath()
{
#if OS_PATH_SEPARATOR != RES_PATH_SEPARATOR
    size_t len = length();
    if (len > 0) {
        char * buf = lockBuffer(len);
        for (char * end = buf + len; buf < end; ++buf) {
            if (*buf == OS_PATH_SEPARATOR)
                *buf = RES_PATH_SEPARATOR;
        }
        unlockBuffer(len);
    }
#endif
    return *this;
}

}; // namespace android