| |
| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #include "SkAtomics.h" |
| #include "SkFixed.h" |
| #include "SkString.h" |
| #include "SkUtils.h" |
| #include <stdarg.h> |
| #include <stdio.h> |
| |
| // number of bytes (on the stack) to receive the printf result |
| static const size_t kBufferSize = 1024; |
| |
| #ifdef SK_BUILD_FOR_WIN |
| #define VSNPRINTF(buffer, size, format, args) \ |
| _vsnprintf_s(buffer, size, _TRUNCATE, format, args) |
| #define SNPRINTF _snprintf |
| #else |
| #define VSNPRINTF vsnprintf |
| #define SNPRINTF snprintf |
| #endif |
| |
| #define ARGS_TO_BUFFER(format, buffer, size, written) \ |
| do { \ |
| va_list args; \ |
| va_start(args, format); \ |
| written = VSNPRINTF(buffer, size, format, args); \ |
| SkASSERT(written >= 0 && written < SkToInt(size)); \ |
| va_end(args); \ |
| } while (0) |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| bool SkStrEndsWith(const char string[], const char suffixStr[]) { |
| SkASSERT(string); |
| SkASSERT(suffixStr); |
| size_t strLen = strlen(string); |
| size_t suffixLen = strlen(suffixStr); |
| return strLen >= suffixLen && |
| !strncmp(string + strLen - suffixLen, suffixStr, suffixLen); |
| } |
| |
| bool SkStrEndsWith(const char string[], const char suffixChar) { |
| SkASSERT(string); |
| size_t strLen = strlen(string); |
| if (0 == strLen) { |
| return false; |
| } else { |
| return (suffixChar == string[strLen-1]); |
| } |
| } |
| |
| int SkStrStartsWithOneOf(const char string[], const char prefixes[]) { |
| int index = 0; |
| do { |
| const char* limit = strchr(prefixes, '\0'); |
| if (!strncmp(string, prefixes, limit - prefixes)) { |
| return index; |
| } |
| prefixes = limit + 1; |
| index++; |
| } while (prefixes[0]); |
| return -1; |
| } |
| |
| char* SkStrAppendU32(char string[], uint32_t dec) { |
| SkDEBUGCODE(char* start = string;) |
| |
| char buffer[SkStrAppendU32_MaxSize]; |
| char* p = buffer + sizeof(buffer); |
| |
| do { |
| *--p = SkToU8('0' + dec % 10); |
| dec /= 10; |
| } while (dec != 0); |
| |
| SkASSERT(p >= buffer); |
| char* stop = buffer + sizeof(buffer); |
| while (p < stop) { |
| *string++ = *p++; |
| } |
| SkASSERT(string - start <= SkStrAppendU32_MaxSize); |
| return string; |
| } |
| |
| char* SkStrAppendS32(char string[], int32_t dec) { |
| uint32_t udec = dec; |
| if (dec < 0) { |
| *string++ = '-'; |
| udec = ~udec + 1; // udec = -udec, but silences some warnings that are trying to be helpful |
| } |
| return SkStrAppendU32(string, udec); |
| } |
| |
| char* SkStrAppendU64(char string[], uint64_t dec, int minDigits) { |
| SkDEBUGCODE(char* start = string;) |
| |
| char buffer[SkStrAppendU64_MaxSize]; |
| char* p = buffer + sizeof(buffer); |
| |
| do { |
| *--p = SkToU8('0' + (int32_t) (dec % 10)); |
| dec /= 10; |
| minDigits--; |
| } while (dec != 0); |
| |
| while (minDigits > 0) { |
| *--p = '0'; |
| minDigits--; |
| } |
| |
| SkASSERT(p >= buffer); |
| size_t cp_len = buffer + sizeof(buffer) - p; |
| memcpy(string, p, cp_len); |
| string += cp_len; |
| |
| SkASSERT(string - start <= SkStrAppendU64_MaxSize); |
| return string; |
| } |
| |
| char* SkStrAppendS64(char string[], int64_t dec, int minDigits) { |
| uint64_t udec = dec; |
| if (dec < 0) { |
| *string++ = '-'; |
| udec = ~udec + 1; // udec = -udec, but silences some warnings that are trying to be helpful |
| } |
| return SkStrAppendU64(string, udec, minDigits); |
| } |
| |
| char* SkStrAppendFloat(char string[], float value) { |
| // since floats have at most 8 significant digits, we limit our %g to that. |
| static const char gFormat[] = "%.8g"; |
| // make it 1 larger for the terminating 0 |
| char buffer[SkStrAppendScalar_MaxSize + 1]; |
| int len = SNPRINTF(buffer, sizeof(buffer), gFormat, value); |
| memcpy(string, buffer, len); |
| SkASSERT(len <= SkStrAppendScalar_MaxSize); |
| return string + len; |
| } |
| |
| char* SkStrAppendFixed(char string[], SkFixed x) { |
| SkDEBUGCODE(char* start = string;) |
| if (x < 0) { |
| *string++ = '-'; |
| x = -x; |
| } |
| |
| unsigned frac = x & 0xFFFF; |
| x >>= 16; |
| if (frac == 0xFFFF) { |
| // need to do this to "round up", since 65535/65536 is closer to 1 than to .9999 |
| x += 1; |
| frac = 0; |
| } |
| string = SkStrAppendS32(string, x); |
| |
| // now handle the fractional part (if any) |
| if (frac) { |
| static const uint16_t gTens[] = { 1000, 100, 10, 1 }; |
| const uint16_t* tens = gTens; |
| |
| x = SkFixedRoundToInt(frac * 10000); |
| SkASSERT(x <= 10000); |
| if (x == 10000) { |
| x -= 1; |
| } |
| *string++ = '.'; |
| do { |
| unsigned powerOfTen = *tens++; |
| *string++ = SkToU8('0' + x / powerOfTen); |
| x %= powerOfTen; |
| } while (x != 0); |
| } |
| |
| SkASSERT(string - start <= SkStrAppendScalar_MaxSize); |
| return string; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // the 3 values are [length] [refcnt] [terminating zero data] |
| const SkString::Rec SkString::gEmptyRec = { 0, 0, 0 }; |
| |
| #define SizeOfRec() (gEmptyRec.data() - (const char*)&gEmptyRec) |
| |
| static uint32_t trim_size_t_to_u32(size_t value) { |
| if (sizeof(size_t) > sizeof(uint32_t)) { |
| if (value > SK_MaxU32) { |
| value = SK_MaxU32; |
| } |
| } |
| return (uint32_t)value; |
| } |
| |
| static size_t check_add32(size_t base, size_t extra) { |
| SkASSERT(base <= SK_MaxU32); |
| if (sizeof(size_t) > sizeof(uint32_t)) { |
| if (base + extra > SK_MaxU32) { |
| extra = SK_MaxU32 - base; |
| } |
| } |
| return extra; |
| } |
| |
| SkString::Rec* SkString::AllocRec(const char text[], size_t len) { |
| Rec* rec; |
| |
| if (0 == len) { |
| rec = const_cast<Rec*>(&gEmptyRec); |
| } else { |
| len = trim_size_t_to_u32(len); |
| |
| // add 1 for terminating 0, then align4 so we can have some slop when growing the string |
| rec = (Rec*)sk_malloc_throw(SizeOfRec() + SkAlign4(len + 1)); |
| rec->fLength = SkToU32(len); |
| rec->fRefCnt = 1; |
| if (text) { |
| memcpy(rec->data(), text, len); |
| } |
| rec->data()[len] = 0; |
| } |
| return rec; |
| } |
| |
| SkString::Rec* SkString::RefRec(Rec* src) { |
| if (src != &gEmptyRec) { |
| sk_atomic_inc(&src->fRefCnt); |
| } |
| return src; |
| } |
| |
| #ifdef SK_DEBUG |
| void SkString::validate() const { |
| // make sure know one has written over our global |
| SkASSERT(0 == gEmptyRec.fLength); |
| SkASSERT(0 == gEmptyRec.fRefCnt); |
| SkASSERT(0 == gEmptyRec.data()[0]); |
| |
| if (fRec != &gEmptyRec) { |
| SkASSERT(fRec->fLength > 0); |
| SkASSERT(fRec->fRefCnt > 0); |
| SkASSERT(0 == fRec->data()[fRec->fLength]); |
| } |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkString::SkString() : fRec(const_cast<Rec*>(&gEmptyRec)) { |
| } |
| |
| SkString::SkString(size_t len) { |
| fRec = AllocRec(nullptr, len); |
| } |
| |
| SkString::SkString(const char text[]) { |
| size_t len = text ? strlen(text) : 0; |
| |
| fRec = AllocRec(text, len); |
| } |
| |
| SkString::SkString(const char text[], size_t len) { |
| fRec = AllocRec(text, len); |
| } |
| |
| SkString::SkString(const SkString& src) { |
| src.validate(); |
| |
| fRec = RefRec(src.fRec); |
| } |
| |
| SkString::~SkString() { |
| this->validate(); |
| |
| if (fRec->fLength) { |
| SkASSERT(fRec->fRefCnt > 0); |
| if (sk_atomic_dec(&fRec->fRefCnt) == 1) { |
| sk_free(fRec); |
| } |
| } |
| } |
| |
| bool SkString::equals(const SkString& src) const { |
| return fRec == src.fRec || this->equals(src.c_str(), src.size()); |
| } |
| |
| bool SkString::equals(const char text[]) const { |
| return this->equals(text, text ? strlen(text) : 0); |
| } |
| |
| bool SkString::equals(const char text[], size_t len) const { |
| SkASSERT(len == 0 || text != nullptr); |
| |
| return fRec->fLength == len && !memcmp(fRec->data(), text, len); |
| } |
| |
| SkString& SkString::operator=(const SkString& src) { |
| this->validate(); |
| |
| if (fRec != src.fRec) { |
| SkString tmp(src); |
| this->swap(tmp); |
| } |
| return *this; |
| } |
| |
| SkString& SkString::operator=(const char text[]) { |
| this->validate(); |
| |
| SkString tmp(text); |
| this->swap(tmp); |
| |
| return *this; |
| } |
| |
| void SkString::reset() { |
| this->validate(); |
| |
| if (fRec->fLength) { |
| SkASSERT(fRec->fRefCnt > 0); |
| if (sk_atomic_dec(&fRec->fRefCnt) == 1) { |
| sk_free(fRec); |
| } |
| } |
| |
| fRec = const_cast<Rec*>(&gEmptyRec); |
| } |
| |
| char* SkString::writable_str() { |
| this->validate(); |
| |
| if (fRec->fLength) { |
| if (fRec->fRefCnt > 1) { |
| Rec* rec = AllocRec(fRec->data(), fRec->fLength); |
| if (sk_atomic_dec(&fRec->fRefCnt) == 1) { |
| // In this case after our check of fRecCnt > 1, we suddenly |
| // did become the only owner, so now we have two copies of the |
| // data (fRec and rec), so we need to delete one of them. |
| sk_free(fRec); |
| } |
| fRec = rec; |
| } |
| } |
| return fRec->data(); |
| } |
| |
| void SkString::set(const char text[]) { |
| this->set(text, text ? strlen(text) : 0); |
| } |
| |
| void SkString::set(const char text[], size_t len) { |
| len = trim_size_t_to_u32(len); |
| |
| if (0 == len) { |
| this->reset(); |
| } else if (1 == fRec->fRefCnt && len <= fRec->fLength) { |
| // should we resize if len <<<< fLength, to save RAM? (e.g. len < (fLength>>1))? |
| // just use less of the buffer without allocating a smaller one |
| char* p = this->writable_str(); |
| if (text) { |
| memcpy(p, text, len); |
| } |
| p[len] = 0; |
| fRec->fLength = SkToU32(len); |
| } else if (1 == fRec->fRefCnt && (fRec->fLength >> 2) == (len >> 2)) { |
| // we have spare room in the current allocation, so don't alloc a larger one |
| char* p = this->writable_str(); |
| if (text) { |
| memcpy(p, text, len); |
| } |
| p[len] = 0; |
| fRec->fLength = SkToU32(len); |
| } else { |
| SkString tmp(text, len); |
| this->swap(tmp); |
| } |
| } |
| |
| void SkString::setUTF16(const uint16_t src[]) { |
| int count = 0; |
| |
| while (src[count]) { |
| count += 1; |
| } |
| this->setUTF16(src, count); |
| } |
| |
| void SkString::setUTF16(const uint16_t src[], size_t count) { |
| count = trim_size_t_to_u32(count); |
| |
| if (0 == count) { |
| this->reset(); |
| } else if (count <= fRec->fLength) { |
| // should we resize if len <<<< fLength, to save RAM? (e.g. len < (fLength>>1)) |
| if (count < fRec->fLength) { |
| this->resize(count); |
| } |
| char* p = this->writable_str(); |
| for (size_t i = 0; i < count; i++) { |
| p[i] = SkToU8(src[i]); |
| } |
| p[count] = 0; |
| } else { |
| SkString tmp(count); // puts a null terminator at the end of the string |
| char* p = tmp.writable_str(); |
| |
| for (size_t i = 0; i < count; i++) { |
| p[i] = SkToU8(src[i]); |
| } |
| this->swap(tmp); |
| } |
| } |
| |
| void SkString::insert(size_t offset, const char text[]) { |
| this->insert(offset, text, text ? strlen(text) : 0); |
| } |
| |
| void SkString::insert(size_t offset, const char text[], size_t len) { |
| if (len) { |
| size_t length = fRec->fLength; |
| if (offset > length) { |
| offset = length; |
| } |
| |
| // Check if length + len exceeds 32bits, we trim len |
| len = check_add32(length, len); |
| if (0 == len) { |
| return; |
| } |
| |
| /* If we're the only owner, and we have room in our allocation for the insert, |
| do it in place, rather than allocating a new buffer. |
| |
| To know we have room, compare the allocated sizes |
| beforeAlloc = SkAlign4(length + 1) |
| afterAlloc = SkAligh4(length + 1 + len) |
| but SkAlign4(x) is (x + 3) >> 2 << 2 |
| which is equivalent for testing to (length + 1 + 3) >> 2 == (length + 1 + 3 + len) >> 2 |
| and we can then eliminate the +1+3 since that doesn't affec the answer |
| */ |
| if (1 == fRec->fRefCnt && (length >> 2) == ((length + len) >> 2)) { |
| char* dst = this->writable_str(); |
| |
| if (offset < length) { |
| memmove(dst + offset + len, dst + offset, length - offset); |
| } |
| memcpy(dst + offset, text, len); |
| |
| dst[length + len] = 0; |
| fRec->fLength = SkToU32(length + len); |
| } else { |
| /* Seems we should use realloc here, since that is safe if it fails |
| (we have the original data), and might be faster than alloc/copy/free. |
| */ |
| SkString tmp(fRec->fLength + len); |
| char* dst = tmp.writable_str(); |
| |
| if (offset > 0) { |
| memcpy(dst, fRec->data(), offset); |
| } |
| memcpy(dst + offset, text, len); |
| if (offset < fRec->fLength) { |
| memcpy(dst + offset + len, fRec->data() + offset, |
| fRec->fLength - offset); |
| } |
| |
| this->swap(tmp); |
| } |
| } |
| } |
| |
| void SkString::insertUnichar(size_t offset, SkUnichar uni) { |
| char buffer[kMaxBytesInUTF8Sequence]; |
| size_t len = SkUTF8_FromUnichar(uni, buffer); |
| |
| if (len) { |
| this->insert(offset, buffer, len); |
| } |
| } |
| |
| void SkString::insertS32(size_t offset, int32_t dec) { |
| char buffer[SkStrAppendS32_MaxSize]; |
| char* stop = SkStrAppendS32(buffer, dec); |
| this->insert(offset, buffer, stop - buffer); |
| } |
| |
| void SkString::insertS64(size_t offset, int64_t dec, int minDigits) { |
| char buffer[SkStrAppendS64_MaxSize]; |
| char* stop = SkStrAppendS64(buffer, dec, minDigits); |
| this->insert(offset, buffer, stop - buffer); |
| } |
| |
| void SkString::insertU32(size_t offset, uint32_t dec) { |
| char buffer[SkStrAppendU32_MaxSize]; |
| char* stop = SkStrAppendU32(buffer, dec); |
| this->insert(offset, buffer, stop - buffer); |
| } |
| |
| void SkString::insertU64(size_t offset, uint64_t dec, int minDigits) { |
| char buffer[SkStrAppendU64_MaxSize]; |
| char* stop = SkStrAppendU64(buffer, dec, minDigits); |
| this->insert(offset, buffer, stop - buffer); |
| } |
| |
| void SkString::insertHex(size_t offset, uint32_t hex, int minDigits) { |
| minDigits = SkTPin(minDigits, 0, 8); |
| |
| static const char gHex[] = "0123456789ABCDEF"; |
| |
| char buffer[8]; |
| char* p = buffer + sizeof(buffer); |
| |
| do { |
| *--p = gHex[hex & 0xF]; |
| hex >>= 4; |
| minDigits -= 1; |
| } while (hex != 0); |
| |
| while (--minDigits >= 0) { |
| *--p = '0'; |
| } |
| |
| SkASSERT(p >= buffer); |
| this->insert(offset, p, buffer + sizeof(buffer) - p); |
| } |
| |
| void SkString::insertScalar(size_t offset, SkScalar value) { |
| char buffer[SkStrAppendScalar_MaxSize]; |
| char* stop = SkStrAppendScalar(buffer, value); |
| this->insert(offset, buffer, stop - buffer); |
| } |
| |
| void SkString::printf(const char format[], ...) { |
| char buffer[kBufferSize]; |
| int length; |
| ARGS_TO_BUFFER(format, buffer, kBufferSize, length); |
| |
| this->set(buffer, length); |
| } |
| |
| void SkString::appendf(const char format[], ...) { |
| char buffer[kBufferSize]; |
| int length; |
| ARGS_TO_BUFFER(format, buffer, kBufferSize, length); |
| |
| this->append(buffer, length); |
| } |
| |
| void SkString::appendVAList(const char format[], va_list args) { |
| char buffer[kBufferSize]; |
| int length = VSNPRINTF(buffer, kBufferSize, format, args); |
| SkASSERT(length >= 0 && length < SkToInt(kBufferSize)); |
| |
| this->append(buffer, length); |
| } |
| |
| void SkString::prependf(const char format[], ...) { |
| char buffer[kBufferSize]; |
| int length; |
| ARGS_TO_BUFFER(format, buffer, kBufferSize, length); |
| |
| this->prepend(buffer, length); |
| } |
| |
| void SkString::prependVAList(const char format[], va_list args) { |
| char buffer[kBufferSize]; |
| int length = VSNPRINTF(buffer, kBufferSize, format, args); |
| SkASSERT(length >= 0 && length < SkToInt(kBufferSize)); |
| |
| this->prepend(buffer, length); |
| } |
| |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkString::remove(size_t offset, size_t length) { |
| size_t size = this->size(); |
| |
| if (offset < size) { |
| if (length > size - offset) { |
| length = size - offset; |
| } |
| SkASSERT(length <= size); |
| SkASSERT(offset <= size - length); |
| if (length > 0) { |
| SkString tmp(size - length); |
| char* dst = tmp.writable_str(); |
| const char* src = this->c_str(); |
| |
| if (offset) { |
| memcpy(dst, src, offset); |
| } |
| size_t tail = size - (offset + length); |
| if (tail) { |
| memcpy(dst + offset, src + (offset + length), tail); |
| } |
| SkASSERT(dst[tmp.size()] == 0); |
| this->swap(tmp); |
| } |
| } |
| } |
| |
| void SkString::swap(SkString& other) { |
| this->validate(); |
| other.validate(); |
| |
| SkTSwap<Rec*>(fRec, other.fRec); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkString SkStringPrintf(const char* format, ...) { |
| SkString formattedOutput; |
| char buffer[kBufferSize]; |
| SK_UNUSED int length; |
| ARGS_TO_BUFFER(format, buffer, kBufferSize, length); |
| formattedOutput.set(buffer); |
| return formattedOutput; |
| } |
| |
| void SkStrSplit(const char* str, const char* delimiters, SkTArray<SkString>* out) { |
| const char* end = str + strlen(str); |
| while (str != end) { |
| // Find a token. |
| const size_t len = strcspn(str, delimiters); |
| out->push_back().set(str, len); |
| str += len; |
| // Skip any delimiters. |
| str += strspn(str, delimiters); |
| } |
| } |
| |
| #undef VSNPRINTF |
| #undef SNPRINTF |
