aboutsummaryrefslogtreecommitdiff
path: root/common/str.cpp
blob: b422a34c3c0db3c0d008dc3854bda9b1784762ef (plain)
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
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 */

#include "common/str.h"
#include "common/hash-str.h"
#include "common/util.h"

#include "common/memorypool.h"

#include <stdarg.h>

#if !defined(__SYMBIAN32__)
#include <new>
#endif


namespace Common {

#if !(defined(PALMOS_ARM) || defined(PALMOS_DEBUG) || defined(__GP32__))
const String String::emptyString;
#else
const char *String::emptyString = "";
#endif


MemoryPool *g_refCountPool = 0;	// FIXME: This is never freed right now

static uint32 computeCapacity(uint32 len) {
	// By default, for the capacity we use the next multiple of 32
	return ((len + 32 - 1) & ~0x1F);
}

String::String(const char *str) : _size(0), _str(_storage) {
	if (str == 0) {
		_storage[0] = 0;
		_size = 0;
	} else
		initWithCStr(str, strlen(str));
}

String::String(const char *str, uint32 len) : _size(0), _str(_storage) {
	initWithCStr(str, len);
}

String::String(const char *beginP, const char *endP) : _size(0), _str(_storage) {
	assert(endP >= beginP);
	initWithCStr(beginP, endP - beginP);
}

void String::initWithCStr(const char *str, uint32 len) {
	assert(str);

	// Init _storage member explicitly (ie. without calling its constructor)
	// for GCC 2.95.x compatibility (see also tracker item #1602879).
	_storage[0] = 0;

	_size = len;

	if (len >= _builtinCapacity) {
		// Not enough internal storage, so allocate more
		_extern._capacity = computeCapacity(len+1);
		_extern._refCount = 0;
		_str = new char[_extern._capacity];
		assert(_str != 0);
	}

	// Copy the string into the storage area
	memmove(_str, str, len);
	_str[len] = 0;
}

String::String(const String &str)
 : _size(str._size) {
	if (str.isStorageIntern()) {
		// String in internal storage: just copy it
		memcpy(_storage, str._storage, _builtinCapacity);
		_str = _storage;
	} else {
		// String in external storage: use refcount mechanism
		str.incRefCount();
		_extern._refCount = str._extern._refCount;
		_extern._capacity = str._extern._capacity;
		_str = str._str;
	}
	assert(_str != 0);
}

String::String(char c)
: _size(0), _str(_storage) {

	_storage[0] = c;
	_storage[1] = 0;

	// TODO/FIXME: There is no reason for the following check -- we *do*
	// allow strings to contain 0 bytes!
	_size = (c == 0) ? 0 : 1;
}

String::~String() {
	decRefCount(_extern._refCount);
}

void String::makeUnique() {
	ensureCapacity(_size, true);
}

/**
 * Ensure that enough storage is available to store at least new_size
 * characters plus a null byte. In addition, if we currently share
 * the storage with another string, unshare it, so that we can safely
 * write to the storage.
 */
void String::ensureCapacity(uint32 new_size, bool keep_old) {
	bool isShared;
	uint32 curCapacity, newCapacity;
	char *newStorage;
	int *oldRefCount = _extern._refCount;

	if (isStorageIntern()) {
		isShared = false;
		curCapacity = _builtinCapacity;
	} else {
		isShared = (oldRefCount && *oldRefCount > 1);
		curCapacity = _extern._capacity;
	}

	// Special case: If there is enough space, and we do not share
	// the storage, then there is nothing to do.
	if (!isShared && new_size < curCapacity)
		return;

	if (isShared && new_size < _builtinCapacity) {
		// We share the storage, but there is enough internal storage: Use that.
		newStorage = _storage;
		newCapacity = _builtinCapacity;
	} else {
		// We need to allocate storage on the heap!

		// Compute a suitable new capacity limit
		newCapacity = MAX(curCapacity * 2, computeCapacity(new_size+1));

		// Allocate new storage
		newStorage = new char[newCapacity];
		assert(newStorage);
	}

	// Copy old data if needed, elsewise reset the new storage.
	if (keep_old) {
		assert(_size < newCapacity);
		memcpy(newStorage, _str, _size + 1);
	} else {
		_size = 0;
		newStorage[0] = 0;
	}

	// Release hold on the old storage ...
	decRefCount(oldRefCount);

	// ... in favor of the new storage
	_str = newStorage;

	if (!isStorageIntern()) {
		// Set the ref count & capacity if we use an external storage.
		// It is important to do this *after* copying any old content,
		// else we would override data that has not yet been copied!
		_extern._refCount = 0;
		_extern._capacity = newCapacity;
	}
}

void String::incRefCount() const {
	assert(!isStorageIntern());
	if (_extern._refCount == 0) {
		if (g_refCountPool == 0) {
			g_refCountPool = new MemoryPool(sizeof(int));
			assert(g_refCountPool);
		}

		_extern._refCount = (int *)g_refCountPool->allocChunk();
		*_extern._refCount = 2;
	} else {
		++(*_extern._refCount);
	}
}

void String::decRefCount(int *oldRefCount) {
	if (isStorageIntern())
		return;

	if (oldRefCount) {
		--(*oldRefCount);
	}
	if (!oldRefCount || *oldRefCount <= 0) {
		// The ref count reached zero, so we free the string storage
		// and the ref count storage.
		if (oldRefCount) {
			assert(g_refCountPool);
			g_refCountPool->freeChunk(oldRefCount);
		}
		delete[] _str;

		// Even though _str points to a freed memory block now,
		// we do not change its value, because any code that calls
		// decRefCount will have to do this afterwards anyway.
	}
}

String& String::operator  =(const char *str) {
	uint32 len = strlen(str);
	ensureCapacity(len, false);
	_size = len;
	memmove(_str, str, len + 1);
	return *this;
}

String &String::operator  =(const String &str) {
	if (&str == this)
		return *this;

	if (str.isStorageIntern()) {
		decRefCount(_extern._refCount);
		_size = str._size;
		_str = _storage;
		memcpy(_str, str._str, _size + 1);
	} else {
		str.incRefCount();
		decRefCount(_extern._refCount);

		_extern._refCount = str._extern._refCount;
		_extern._capacity = str._extern._capacity;
		_size = str._size;
		_str = str._str;
	}

	return *this;
}

String& String::operator  =(char c) {
	decRefCount(_extern._refCount);
	_str = _storage;
	_size = 1;
	_str[0] = c;
	_str[1] = 0;
	return *this;
}

String &String::operator +=(const char *str) {
	if (_str <= str && str <= _str + _size)
		return operator+=(Common::String(str));

	int len = strlen(str);
	if (len > 0) {
		ensureCapacity(_size + len, true);

		memcpy(_str + _size, str, len + 1);
		_size += len;
	}
	return *this;
}

String &String::operator +=(const String &str) {
	if (&str == this)
		return operator+=(Common::String(str));

	int len = str._size;
	if (len > 0) {
		ensureCapacity(_size + len, true);

		memcpy(_str + _size, str._str, len + 1);
		_size += len;
	}
	return *this;
}

String &String::operator +=(char c) {
	ensureCapacity(_size + 1, true);

	_str[_size++] = c;
	_str[_size] = 0;

	return *this;
}

bool String::hasPrefix(const String &x) const {
	return hasPrefix(x.c_str());
}

bool String::hasPrefix(const char *x) const {
	assert(x != 0);
	// Compare x with the start of _str.
	const char *y = c_str();
	while (*x && *x == *y) {
		++x;
		++y;
	}
	// It's a prefix, if and only if all letters in x are 'used up' before
	// _str ends.
	return *x == 0;
}

bool String::hasSuffix(const String &x) const {
	return hasSuffix(x.c_str());
}

bool String::hasSuffix(const char *x) const {
	assert(x != 0);
	// Compare x with the end of _str.
	const uint32 x_size = strlen(x);
	if (x_size > _size)
		return false;
	const char *y = c_str() + _size - x_size;
	while (*x && *x == *y) {
		++x;
		++y;
	}
	// It's a suffix, if and only if all letters in x are 'used up' before
	// _str ends.
	return *x == 0;
}

bool String::contains(const String &x) const {
	return strstr(c_str(), x.c_str()) != NULL;
}

bool String::contains(const char *x) const {
	assert(x != 0);
	return strstr(c_str(), x) != NULL;
}

bool String::contains(char x) const {
	return strchr(c_str(), x) != NULL;
}

bool String::matchString(const char *pat, bool pathMode) const {
	return Common::matchString(c_str(), pat, pathMode);
}

bool String::matchString(const String &pat, bool pathMode) const {
	return Common::matchString(c_str(), pat.c_str(), pathMode);
}

void String::deleteLastChar() {
	if (_size > 0)
		deleteChar(_size - 1);
}

void String::deleteChar(uint32 p) {
	assert(p < _size);

	makeUnique();
	while (p++ < _size)
		_str[p-1] = _str[p];
	_size--;
}

void String::clear() {
	decRefCount(_extern._refCount);

	_size = 0;
	_str = _storage;
	_storage[0] = 0;
}

void String::setChar(char c, uint32 p) {
	assert(p <= _size);

	makeUnique();
	_str[p] = c;
}

void String::insertChar(char c, uint32 p) {
	assert(p <= _size);

	ensureCapacity(_size + 1, true);
	_size++;
	for (uint32 i = _size; i > p; --i)
		_str[i] = _str[i-1];
	_str[p] = c;
}

void String::toLowercase() {
	makeUnique();
	for (uint32 i = 0; i < _size; ++i)
		_str[i] = tolower(_str[i]);
}

void String::toUppercase() {
	makeUnique();
	for (uint32 i = 0; i < _size; ++i)
		_str[i] = toupper(_str[i]);
}

void String::trim() {
	if (_size == 0)
		return;

	makeUnique();

	// Trim trailing whitespace
	while (_size >= 1 && isspace(_str[_size-1]))
		_size--;
	_str[_size] = 0;

	// Trim leading whitespace
	char *t = _str;
	while (isspace(*t))
		t++;

	if (t != _str) {
		_size -= t - _str;
		memmove(_str, t, _size + 1);
	}
}

uint String::hash() const {
	return hashit(c_str());
}

// static
String String::printf(const char *fmt, ...) {
	String output;
	assert(output.isStorageIntern());

	va_list va;
	va_start(va, fmt);
	int len = vsnprintf(output._str, _builtinCapacity, fmt, va);
	va_end(va);

	if (len < (int)_builtinCapacity) {
		// vsnprintf succeeded
		output._size = len;
	} else {
		// vsnprintf didn't have enough space, so grow buffer
		output.ensureCapacity(len, false);
		va_start(va, fmt);
		int len2 = vsnprintf(output._str, len+1, fmt, va);
		va_end(va);
		assert(len == len2);
		output._size = len2;
	}

	return output;
}


#pragma mark -

bool String::operator ==(const String &x) const {
	return equals(x);
}

bool String::operator ==(const char *x) const {
	assert(x != 0);
	return equals(x);
}

bool String::operator !=(const String &x) const {
	return !equals(x);
}

bool String::operator !=(const char *x) const {
	assert(x != 0);
	return !equals(x);
}

bool String::operator < (const String &x) const {
	return compareTo(x) < 0;
}

bool String::operator <= (const String &x) const {
	return compareTo(x) <= 0;
}

bool String::operator > (const String &x) const {
	return compareTo(x) > 0;
}

bool String::operator >= (const String &x) const {
	return compareTo(x) >= 0;
}

#pragma mark -

bool operator == (const char* y, const String &x) {
	return (x == y);
}

bool operator != (const char* y, const String &x) {
	return x != y;
}

#pragma mark -

bool String::equals(const String &x) const {
	return (0 == compareTo(x));
}

bool String::equals(const char *x) const {
	assert(x != 0);
	return (0 == compareTo(x));
}

bool String::equalsIgnoreCase(const String &x) const {
	return (0 == compareToIgnoreCase(x));
}

bool String::equalsIgnoreCase(const char *x) const {
	assert(x != 0);
	return (0 == compareToIgnoreCase(x));
}

int String::compareTo(const String &x) const {
	return compareTo(x.c_str());
}

int String::compareTo(const char *x) const {
	assert(x != 0);
	return strcmp(c_str(), x);
}

int String::compareToIgnoreCase(const String &x) const {
	return compareToIgnoreCase(x.c_str());
}

int String::compareToIgnoreCase(const char *x) const {
	assert(x != 0);
	return scumm_stricmp(c_str(), x);
}

#pragma mark -

String operator +(const String &x, const String &y) {
	String temp(x);
	temp += y;
	return temp;
}

String operator +(const char *x, const String &y) {
	String temp(x);
	temp += y;
	return temp;
}

String operator +(const String &x, const char *y) {
	String temp(x);
	temp += y;
	return temp;
}

String operator +(char x, const String &y) {
	String temp(x);
	temp += y;
	return temp;
}

String operator +(const String &x, char y) {
	String temp(x);
	temp += y;
	return temp;
}

char *ltrim(char *t) {
	while (isspace(*t))
		t++;
	return t;
}

char *rtrim(char *t) {
	int l = strlen(t) - 1;
	while (l >= 0 && isspace(t[l]))
		t[l--] = 0;
	return t;
}

char *trim(char *t) {
	return rtrim(ltrim(t));
}

Common::String lastPathComponent(const Common::String &path, const char sep) {
	const char *str = path.c_str();
	const char *last = str + path.size();

	// Skip over trailing slashes
	while (last > str && *(last-1) == sep)
		--last;

	// Path consisted of only slashes -> return empty string
	if (last == str)
		return Common::String();

	// Now scan the whole component
	const char *first = last - 1;
	while (first >= str && *first != sep)
		--first;

	if (*first == sep)
		first++;

	return Common::String(first, last);
}

Common::String normalizePath(const Common::String &path, const char sep) {
	if (path.empty())
		return path;

	const char *cur = path.c_str();
	Common::String result;

	// If there is a leading slash, preserve that:
	if (*cur == sep) {
		result += sep;
		while (*cur == sep)
			++cur;
	}

	// Scan till the end of the String
	while (*cur != 0) {
		const char *start = cur;

		// Scan till the next path separator resp. the end of the string
		while (*cur != sep && *cur != 0)
			cur++;

		const Common::String component(start, cur);

		// Skip empty components and dot components, add all others
		if (!component.empty() && component != ".") {
			// Add a separator before the component, unless the result
			// string already ends with one (which happens only if the
			// path *starts* with a separator).
			if (!result.empty() && result.lastChar() != sep)
				result += sep;

			// Add the component
			result += component;
		}

		// Skip over separator chars
		while (*cur == sep)
			cur++;
	}

	return result;
}

bool matchString(const char *str, const char *pat, bool pathMode) {
	assert(str);
	assert(pat);

	const char *p = 0;
	const char *q = 0;

	for (;;) {
		if (pathMode && *str == '/') {
			p = 0;
			q = 0;
			if (*pat == '?')
				return false;
		}

		switch (*pat) {
		case '*':
			// Record pattern / string possition for backtracking
			p = ++pat;
			q = str;
			// If pattern ended with * -> match
			if (!*pat)
				return true;
			break;

		default:
			if (*pat != *str) {
				if (p) {
					// No match, oops -> try to backtrack
					pat = p;
					str = ++q;
					if (!*str)
						return !*pat;
					break;
				}
				else
					return false;
			}
			// fallthrough
		case '?':
			if (!*str)
				return !*pat;
			pat++;
			str++;
		}
	}
}

}	// End of namespace Common