3 * Copyright 2006 The Android Open Source Project
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
17 // number of bytes (on the stack) to receive the printf result
18 static const size_t kBufferSize = 1024;
20 #ifdef SK_BUILD_FOR_WIN
21 #define VSNPRINTF(buffer, size, format, args) \
22 _vsnprintf_s(buffer, size, _TRUNCATE, format, args)
23 #define SNPRINTF _snprintf
25 #define VSNPRINTF vsnprintf
26 #define SNPRINTF snprintf
29 #define ARGS_TO_BUFFER(format, buffer, size) \
32 va_start(args, format); \
33 VSNPRINTF(buffer, size, format, args); \
37 ///////////////////////////////////////////////////////////////////////////////
39 bool SkStrEndsWith(const char string[], const char suffixStr[]) {
42 size_t strLen = strlen(string);
43 size_t suffixLen = strlen(suffixStr);
44 return strLen >= suffixLen &&
45 !strncmp(string + strLen - suffixLen, suffixStr, suffixLen);
48 bool SkStrEndsWith(const char string[], const char suffixChar) {
50 size_t strLen = strlen(string);
54 return (suffixChar == string[strLen-1]);
58 int SkStrStartsWithOneOf(const char string[], const char prefixes[]) {
61 const char* limit = strchr(prefixes, '\0');
62 if (!strncmp(string, prefixes, limit - prefixes)) {
67 } while (prefixes[0]);
71 char* SkStrAppendU32(char string[], uint32_t dec) {
72 SkDEBUGCODE(char* start = string;)
74 char buffer[SkStrAppendU32_MaxSize];
75 char* p = buffer + sizeof(buffer);
78 *--p = SkToU8('0' + dec % 10);
82 SkASSERT(p >= buffer);
83 char* stop = buffer + sizeof(buffer);
87 SkASSERT(string - start <= SkStrAppendU32_MaxSize);
91 char* SkStrAppendS32(char string[], int32_t dec) {
96 return SkStrAppendU32(string, static_cast<uint32_t>(dec));
99 char* SkStrAppendU64(char string[], uint64_t dec, int minDigits) {
100 SkDEBUGCODE(char* start = string;)
102 char buffer[SkStrAppendU64_MaxSize];
103 char* p = buffer + sizeof(buffer);
106 *--p = SkToU8('0' + (int32_t) (dec % 10));
111 while (minDigits > 0) {
116 SkASSERT(p >= buffer);
117 size_t cp_len = buffer + sizeof(buffer) - p;
118 memcpy(string, p, cp_len);
121 SkASSERT(string - start <= SkStrAppendU64_MaxSize);
125 char* SkStrAppendS64(char string[], int64_t dec, int minDigits) {
130 return SkStrAppendU64(string, static_cast<uint64_t>(dec), minDigits);
133 char* SkStrAppendFloat(char string[], float value) {
134 // since floats have at most 8 significant digits, we limit our %g to that.
135 static const char gFormat[] = "%.8g";
136 // make it 1 larger for the terminating 0
137 char buffer[SkStrAppendScalar_MaxSize + 1];
138 int len = SNPRINTF(buffer, sizeof(buffer), gFormat, value);
139 memcpy(string, buffer, len);
140 SkASSERT(len <= SkStrAppendScalar_MaxSize);
144 char* SkStrAppendFixed(char string[], SkFixed x) {
145 SkDEBUGCODE(char* start = string;)
151 unsigned frac = x & 0xFFFF;
153 if (frac == 0xFFFF) {
154 // need to do this to "round up", since 65535/65536 is closer to 1 than to .9999
158 string = SkStrAppendS32(string, x);
160 // now handle the fractional part (if any)
162 static const uint16_t gTens[] = { 1000, 100, 10, 1 };
163 const uint16_t* tens = gTens;
165 x = SkFixedRoundToInt(frac * 10000);
166 SkASSERT(x <= 10000);
172 unsigned powerOfTen = *tens++;
173 *string++ = SkToU8('0' + x / powerOfTen);
178 SkASSERT(string - start <= SkStrAppendScalar_MaxSize);
182 ///////////////////////////////////////////////////////////////////////////////
184 // the 3 values are [length] [refcnt] [terminating zero data]
185 const SkString::Rec SkString::gEmptyRec = { 0, 0, 0 };
187 #define SizeOfRec() (gEmptyRec.data() - (const char*)&gEmptyRec)
189 static uint32_t trim_size_t_to_u32(size_t value) {
190 if (sizeof(size_t) > sizeof(uint32_t)) {
191 if (value > SK_MaxU32) {
195 return (uint32_t)value;
198 static size_t check_add32(size_t base, size_t extra) {
199 SkASSERT(base <= SK_MaxU32);
200 if (sizeof(size_t) > sizeof(uint32_t)) {
201 if (base + extra > SK_MaxU32) {
202 extra = SK_MaxU32 - base;
208 SkString::Rec* SkString::AllocRec(const char text[], size_t len) {
212 rec = const_cast<Rec*>(&gEmptyRec);
214 len = trim_size_t_to_u32(len);
216 // add 1 for terminating 0, then align4 so we can have some slop when growing the string
217 rec = (Rec*)sk_malloc_throw(SizeOfRec() + SkAlign4(len + 1));
218 rec->fLength = SkToU32(len);
221 memcpy(rec->data(), text, len);
223 rec->data()[len] = 0;
228 SkString::Rec* SkString::RefRec(Rec* src) {
229 if (src != &gEmptyRec) {
230 sk_atomic_inc(&src->fRefCnt);
236 void SkString::validate() const {
237 // make sure know one has written over our global
238 SkASSERT(0 == gEmptyRec.fLength);
239 SkASSERT(0 == gEmptyRec.fRefCnt);
240 SkASSERT(0 == gEmptyRec.data()[0]);
242 if (fRec != &gEmptyRec) {
243 SkASSERT(fRec->fLength > 0);
244 SkASSERT(fRec->fRefCnt > 0);
245 SkASSERT(0 == fRec->data()[fRec->fLength]);
247 SkASSERT(fStr == c_str());
251 ///////////////////////////////////////////////////////////////////////////////
253 SkString::SkString() : fRec(const_cast<Rec*>(&gEmptyRec)) {
259 SkString::SkString(size_t len) {
260 fRec = AllocRec(NULL, len);
266 SkString::SkString(const char text[]) {
267 size_t len = text ? strlen(text) : 0;
269 fRec = AllocRec(text, len);
275 SkString::SkString(const char text[], size_t len) {
276 fRec = AllocRec(text, len);
282 SkString::SkString(const SkString& src) {
285 fRec = RefRec(src.fRec);
291 SkString::~SkString() {
295 SkASSERT(fRec->fRefCnt > 0);
296 if (sk_atomic_dec(&fRec->fRefCnt) == 1) {
302 bool SkString::equals(const SkString& src) const {
303 return fRec == src.fRec || this->equals(src.c_str(), src.size());
306 bool SkString::equals(const char text[]) const {
307 return this->equals(text, text ? strlen(text) : 0);
310 bool SkString::equals(const char text[], size_t len) const {
311 SkASSERT(len == 0 || text != NULL);
313 return fRec->fLength == len && !memcmp(fRec->data(), text, len);
316 SkString& SkString::operator=(const SkString& src) {
319 if (fRec != src.fRec) {
326 SkString& SkString::operator=(const char text[]) {
335 void SkString::reset() {
339 SkASSERT(fRec->fRefCnt > 0);
340 if (sk_atomic_dec(&fRec->fRefCnt) == 1) {
345 fRec = const_cast<Rec*>(&gEmptyRec);
351 char* SkString::writable_str() {
355 if (fRec->fRefCnt > 1) {
356 Rec* rec = AllocRec(fRec->data(), fRec->fLength);
357 if (sk_atomic_dec(&fRec->fRefCnt) == 1) {
358 // In this case after our check of fRecCnt > 1, we suddenly
359 // did become the only owner, so now we have two copies of the
360 // data (fRec and rec), so we need to delete one of them.
372 void SkString::set(const char text[]) {
373 this->set(text, text ? strlen(text) : 0);
376 void SkString::set(const char text[], size_t len) {
377 len = trim_size_t_to_u32(len);
381 } else if (1 == fRec->fRefCnt && len <= fRec->fLength) {
382 // should we resize if len <<<< fLength, to save RAM? (e.g. len < (fLength>>1))?
383 // just use less of the buffer without allocating a smaller one
384 char* p = this->writable_str();
386 memcpy(p, text, len);
389 fRec->fLength = SkToU32(len);
390 } else if (1 == fRec->fRefCnt && (fRec->fLength >> 2) == (len >> 2)) {
391 // we have spare room in the current allocation, so don't alloc a larger one
392 char* p = this->writable_str();
394 memcpy(p, text, len);
397 fRec->fLength = SkToU32(len);
399 SkString tmp(text, len);
404 void SkString::setUTF16(const uint16_t src[]) {
410 this->setUTF16(src, count);
413 void SkString::setUTF16(const uint16_t src[], size_t count) {
414 count = trim_size_t_to_u32(count);
418 } else if (count <= fRec->fLength) {
419 // should we resize if len <<<< fLength, to save RAM? (e.g. len < (fLength>>1))
420 if (count < fRec->fLength) {
423 char* p = this->writable_str();
424 for (size_t i = 0; i < count; i++) {
425 p[i] = SkToU8(src[i]);
429 SkString tmp(count); // puts a null terminator at the end of the string
430 char* p = tmp.writable_str();
432 for (size_t i = 0; i < count; i++) {
433 p[i] = SkToU8(src[i]);
439 void SkString::insert(size_t offset, const char text[]) {
440 this->insert(offset, text, text ? strlen(text) : 0);
443 void SkString::insert(size_t offset, const char text[], size_t len) {
445 size_t length = fRec->fLength;
446 if (offset > length) {
450 // Check if length + len exceeds 32bits, we trim len
451 len = check_add32(length, len);
456 /* If we're the only owner, and we have room in our allocation for the insert,
457 do it in place, rather than allocating a new buffer.
459 To know we have room, compare the allocated sizes
460 beforeAlloc = SkAlign4(length + 1)
461 afterAlloc = SkAligh4(length + 1 + len)
462 but SkAlign4(x) is (x + 3) >> 2 << 2
463 which is equivalent for testing to (length + 1 + 3) >> 2 == (length + 1 + 3 + len) >> 2
464 and we can then eliminate the +1+3 since that doesn't affec the answer
466 if (1 == fRec->fRefCnt && (length >> 2) == ((length + len) >> 2)) {
467 char* dst = this->writable_str();
469 if (offset < length) {
470 memmove(dst + offset + len, dst + offset, length - offset);
472 memcpy(dst + offset, text, len);
474 dst[length + len] = 0;
475 fRec->fLength = SkToU32(length + len);
477 /* Seems we should use realloc here, since that is safe if it fails
478 (we have the original data), and might be faster than alloc/copy/free.
480 SkString tmp(fRec->fLength + len);
481 char* dst = tmp.writable_str();
484 memcpy(dst, fRec->data(), offset);
486 memcpy(dst + offset, text, len);
487 if (offset < fRec->fLength) {
488 memcpy(dst + offset + len, fRec->data() + offset,
489 fRec->fLength - offset);
497 void SkString::insertUnichar(size_t offset, SkUnichar uni) {
498 char buffer[kMaxBytesInUTF8Sequence];
499 size_t len = SkUTF8_FromUnichar(uni, buffer);
502 this->insert(offset, buffer, len);
506 void SkString::insertS32(size_t offset, int32_t dec) {
507 char buffer[SkStrAppendS32_MaxSize];
508 char* stop = SkStrAppendS32(buffer, dec);
509 this->insert(offset, buffer, stop - buffer);
512 void SkString::insertS64(size_t offset, int64_t dec, int minDigits) {
513 char buffer[SkStrAppendS64_MaxSize];
514 char* stop = SkStrAppendS64(buffer, dec, minDigits);
515 this->insert(offset, buffer, stop - buffer);
518 void SkString::insertU32(size_t offset, uint32_t dec) {
519 char buffer[SkStrAppendU32_MaxSize];
520 char* stop = SkStrAppendU32(buffer, dec);
521 this->insert(offset, buffer, stop - buffer);
524 void SkString::insertU64(size_t offset, uint64_t dec, int minDigits) {
525 char buffer[SkStrAppendU64_MaxSize];
526 char* stop = SkStrAppendU64(buffer, dec, minDigits);
527 this->insert(offset, buffer, stop - buffer);
530 void SkString::insertHex(size_t offset, uint32_t hex, int minDigits) {
531 minDigits = SkPin32(minDigits, 0, 8);
533 static const char gHex[] = "0123456789ABCDEF";
536 char* p = buffer + sizeof(buffer);
539 *--p = gHex[hex & 0xF];
544 while (--minDigits >= 0) {
548 SkASSERT(p >= buffer);
549 this->insert(offset, p, buffer + sizeof(buffer) - p);
552 void SkString::insertScalar(size_t offset, SkScalar value) {
553 char buffer[SkStrAppendScalar_MaxSize];
554 char* stop = SkStrAppendScalar(buffer, value);
555 this->insert(offset, buffer, stop - buffer);
558 void SkString::printf(const char format[], ...) {
559 char buffer[kBufferSize];
560 ARGS_TO_BUFFER(format, buffer, kBufferSize);
562 this->set(buffer, strlen(buffer));
565 void SkString::appendf(const char format[], ...) {
566 char buffer[kBufferSize];
567 ARGS_TO_BUFFER(format, buffer, kBufferSize);
569 this->append(buffer, strlen(buffer));
572 void SkString::appendVAList(const char format[], va_list args) {
573 char buffer[kBufferSize];
574 VSNPRINTF(buffer, kBufferSize, format, args);
576 this->append(buffer, strlen(buffer));
579 void SkString::prependf(const char format[], ...) {
580 char buffer[kBufferSize];
581 ARGS_TO_BUFFER(format, buffer, kBufferSize);
583 this->prepend(buffer, strlen(buffer));
586 void SkString::prependVAList(const char format[], va_list args) {
587 char buffer[kBufferSize];
588 VSNPRINTF(buffer, kBufferSize, format, args);
590 this->prepend(buffer, strlen(buffer));
594 ///////////////////////////////////////////////////////////////////////////////
596 void SkString::remove(size_t offset, size_t length) {
597 size_t size = this->size();
600 if (length > size - offset) {
601 length = size - offset;
603 SkASSERT(length <= size);
604 SkASSERT(offset <= size - length);
606 SkString tmp(size - length);
607 char* dst = tmp.writable_str();
608 const char* src = this->c_str();
611 memcpy(dst, src, offset);
613 size_t tail = size - (offset + length);
615 memcpy(dst + offset, src + (offset + length), tail);
617 SkASSERT(dst[tmp.size()] == 0);
623 void SkString::swap(SkString& other) {
627 SkTSwap<Rec*>(fRec, other.fRec);
629 SkTSwap<const char*>(fStr, other.fStr);
633 ///////////////////////////////////////////////////////////////////////////////
635 SkString SkStringPrintf(const char* format, ...) {
636 SkString formattedOutput;
637 char buffer[kBufferSize];
638 ARGS_TO_BUFFER(format, buffer, kBufferSize);
639 formattedOutput.set(buffer);
640 return formattedOutput;
643 void SkStrSplit(const char* str, const char* delimiters, SkTArray<SkString>* out) {
644 const char* end = str + strlen(str);
647 const size_t len = strcspn(str, delimiters);
648 out->push_back().set(str, len);
650 // Skip any delimiters.
651 str += strspn(str, delimiters);