560 lines
13 KiB
C++
560 lines
13 KiB
C++
// This file is part of AsmJit project <https://asmjit.com>
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//
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// See asmjit.h or LICENSE.md for license and copyright information
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// SPDX-License-Identifier: Zlib
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#include "../core/api-build_p.h"
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#include "../core/string.h"
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#include "../core/support.h"
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ASMJIT_BEGIN_NAMESPACE
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// String - Globals
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// ================
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static const char String_baseN[] = "0123456789ABCDEF";
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constexpr size_t kMinAllocSize = 64;
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constexpr size_t kMaxAllocSize = SIZE_MAX - Globals::kGrowThreshold;
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// String - Clear & Reset
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// ======================
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Error String::reset() noexcept {
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if (_type == kTypeLarge)
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::free(_large.data);
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_resetInternal();
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return kErrorOk;
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}
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Error String::clear() noexcept {
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if (isLargeOrExternal()) {
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_large.size = 0;
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_large.data[0] = '\0';
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}
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else {
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_raw.uptr[0] = 0;
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}
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return kErrorOk;
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}
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// String - Prepare
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// ================
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char* String::prepare(ModifyOp op, size_t size) noexcept {
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char* curData;
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size_t curSize;
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size_t curCapacity;
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if (isLargeOrExternal()) {
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curData = this->_large.data;
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curSize = this->_large.size;
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curCapacity = this->_large.capacity;
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}
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else {
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curData = this->_small.data;
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curSize = this->_small.type;
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curCapacity = kSSOCapacity;
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}
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if (op == ModifyOp::kAssign) {
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if (size > curCapacity) {
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// Prevent arithmetic overflow.
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if (ASMJIT_UNLIKELY(size >= kMaxAllocSize))
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return nullptr;
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size_t newCapacity = Support::alignUp<size_t>(size + 1, kMinAllocSize);
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char* newData = static_cast<char*>(::malloc(newCapacity));
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if (ASMJIT_UNLIKELY(!newData))
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return nullptr;
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if (_type == kTypeLarge)
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::free(curData);
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_large.type = kTypeLarge;
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_large.size = size;
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_large.capacity = newCapacity - 1;
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_large.data = newData;
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newData[size] = '\0';
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return newData;
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}
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else {
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_setSize(size);
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curData[size] = '\0';
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return curData;
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}
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}
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else {
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// Prevent arithmetic overflow.
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if (ASMJIT_UNLIKELY(size >= kMaxAllocSize - curSize))
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return nullptr;
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size_t newSize = size + curSize;
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size_t newSizePlusOne = newSize + 1;
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if (newSizePlusOne > curCapacity) {
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size_t newCapacity = Support::max<size_t>(curCapacity + 1, kMinAllocSize);
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if (newCapacity < newSizePlusOne && newCapacity < Globals::kGrowThreshold)
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newCapacity = Support::alignUpPowerOf2(newCapacity);
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if (newCapacity < newSizePlusOne)
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newCapacity = Support::alignUp(newSizePlusOne, Globals::kGrowThreshold);
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if (ASMJIT_UNLIKELY(newCapacity < newSizePlusOne))
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return nullptr;
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char* newData = static_cast<char*>(::malloc(newCapacity));
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if (ASMJIT_UNLIKELY(!newData))
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return nullptr;
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memcpy(newData, curData, curSize);
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if (_type == kTypeLarge)
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::free(curData);
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_large.type = kTypeLarge;
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_large.size = newSize;
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_large.capacity = newCapacity - 1;
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_large.data = newData;
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newData[newSize] = '\0';
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return newData + curSize;
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}
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else {
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_setSize(newSize);
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curData[newSize] = '\0';
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return curData + curSize;
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}
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}
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}
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// String - Assign
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// ===============
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Error String::assign(const char* data, size_t size) noexcept {
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char* dst = nullptr;
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// Null terminated string without `size` specified.
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if (size == SIZE_MAX)
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size = data ? strlen(data) : size_t(0);
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if (isLargeOrExternal()) {
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if (size <= _large.capacity) {
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dst = _large.data;
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_large.size = size;
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}
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else {
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size_t capacityPlusOne = Support::alignUp(size + 1, 32);
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if (ASMJIT_UNLIKELY(capacityPlusOne < size))
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return DebugUtils::errored(kErrorOutOfMemory);
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dst = static_cast<char*>(::malloc(capacityPlusOne));
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if (ASMJIT_UNLIKELY(!dst))
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return DebugUtils::errored(kErrorOutOfMemory);
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if (_type == kTypeLarge)
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::free(_large.data);
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_large.type = kTypeLarge;
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_large.data = dst;
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_large.size = size;
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_large.capacity = capacityPlusOne - 1;
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}
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}
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else {
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if (size <= kSSOCapacity) {
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ASMJIT_ASSERT(size < 0xFFu);
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dst = _small.data;
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_small.type = uint8_t(size);
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}
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else {
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dst = static_cast<char*>(::malloc(size + 1));
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if (ASMJIT_UNLIKELY(!dst))
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return DebugUtils::errored(kErrorOutOfMemory);
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_large.type = kTypeLarge;
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_large.data = dst;
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_large.size = size;
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_large.capacity = size;
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}
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}
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// Optionally copy data from `data` and null-terminate.
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if (data && size) {
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// NOTE: It's better to use `memmove()`. If, for any reason, somebody uses
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// this function to substring the same string it would work as expected.
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::memmove(dst, data, size);
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}
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dst[size] = '\0';
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return kErrorOk;
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}
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// String - Operations
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// ===================
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Error String::_opString(ModifyOp op, const char* str, size_t size) noexcept {
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if (size == SIZE_MAX)
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size = str ? strlen(str) : size_t(0);
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if (!size)
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return kErrorOk;
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char* p = prepare(op, size);
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if (!p)
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return DebugUtils::errored(kErrorOutOfMemory);
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memcpy(p, str, size);
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return kErrorOk;
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}
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Error String::_opChar(ModifyOp op, char c) noexcept {
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char* p = prepare(op, 1);
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if (!p)
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return DebugUtils::errored(kErrorOutOfMemory);
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*p = c;
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return kErrorOk;
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}
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Error String::_opChars(ModifyOp op, char c, size_t n) noexcept {
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if (!n)
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return kErrorOk;
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char* p = prepare(op, n);
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if (!p)
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return DebugUtils::errored(kErrorOutOfMemory);
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memset(p, c, n);
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return kErrorOk;
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}
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Error String::padEnd(size_t n, char c) noexcept {
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size_t size = this->size();
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return n > size ? appendChars(c, n - size) : kErrorOk;
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}
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Error String::_opNumber(ModifyOp op, uint64_t i, uint32_t base, size_t width, StringFormatFlags flags) noexcept {
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if (base == 0)
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base = 10;
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char buf[128];
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char* p = buf + ASMJIT_ARRAY_SIZE(buf);
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uint64_t orig = i;
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char sign = '\0';
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// Format Sign
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// -----------
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if (Support::test(flags, StringFormatFlags::kSigned) && int64_t(i) < 0) {
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i = uint64_t(-int64_t(i));
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sign = '-';
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}
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else if (Support::test(flags, StringFormatFlags::kShowSign)) {
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sign = '+';
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}
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else if (Support::test(flags, StringFormatFlags::kShowSpace)) {
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sign = ' ';
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}
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// Format Number
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// -------------
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switch (base) {
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case 2:
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case 8:
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case 16: {
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uint32_t shift = Support::ctz(base);
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uint32_t mask = base - 1;
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do {
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uint64_t d = i >> shift;
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size_t r = size_t(i & mask);
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*--p = String_baseN[r];
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i = d;
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} while (i);
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break;
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}
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case 10: {
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do {
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uint64_t d = i / 10;
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uint64_t r = i % 10;
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*--p = char(uint32_t('0') + uint32_t(r));
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i = d;
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} while (i);
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break;
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}
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default:
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return DebugUtils::errored(kErrorInvalidArgument);
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}
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size_t numberSize = (size_t)(buf + ASMJIT_ARRAY_SIZE(buf) - p);
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// Alternate Form
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// --------------
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if (Support::test(flags, StringFormatFlags::kAlternate)) {
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if (base == 8) {
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if (orig != 0)
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*--p = '0';
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}
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if (base == 16) {
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*--p = 'x';
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*--p = '0';
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}
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}
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// String Width
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// ------------
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if (sign != 0)
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*--p = sign;
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if (width > 256)
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width = 256;
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if (width <= numberSize)
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width = 0;
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else
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width -= numberSize;
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// Finalize
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// --------
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size_t prefixSize = (size_t)(buf + ASMJIT_ARRAY_SIZE(buf) - p) - numberSize;
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char* data = prepare(op, prefixSize + width + numberSize);
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if (!data)
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return DebugUtils::errored(kErrorOutOfMemory);
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memcpy(data, p, prefixSize);
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data += prefixSize;
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memset(data, '0', width);
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data += width;
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memcpy(data, p + prefixSize, numberSize);
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return kErrorOk;
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}
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Error String::_opHex(ModifyOp op, const void* data, size_t size, char separator) noexcept {
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char* dst;
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const uint8_t* src = static_cast<const uint8_t*>(data);
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if (!size)
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return kErrorOk;
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if (separator) {
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if (ASMJIT_UNLIKELY(size >= SIZE_MAX / 3))
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return DebugUtils::errored(kErrorOutOfMemory);
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dst = prepare(op, size * 3 - 1);
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if (ASMJIT_UNLIKELY(!dst))
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return DebugUtils::errored(kErrorOutOfMemory);
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size_t i = 0;
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for (;;) {
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dst[0] = String_baseN[(src[0] >> 4) & 0xF];
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dst[1] = String_baseN[(src[0] ) & 0xF];
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if (++i == size)
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break;
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// This makes sure that the separator is only put between two hexadecimal bytes.
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dst[2] = separator;
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dst += 3;
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src++;
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}
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}
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else {
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if (ASMJIT_UNLIKELY(size >= SIZE_MAX / 2))
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return DebugUtils::errored(kErrorOutOfMemory);
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dst = prepare(op, size * 2);
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if (ASMJIT_UNLIKELY(!dst))
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return DebugUtils::errored(kErrorOutOfMemory);
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for (size_t i = 0; i < size; i++, dst += 2, src++) {
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dst[0] = String_baseN[(src[0] >> 4) & 0xF];
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dst[1] = String_baseN[(src[0] ) & 0xF];
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}
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}
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return kErrorOk;
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}
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Error String::_opFormat(ModifyOp op, const char* fmt, ...) noexcept {
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Error err;
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va_list ap;
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va_start(ap, fmt);
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err = _opVFormat(op, fmt, ap);
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va_end(ap);
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return err;
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}
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Error String::_opVFormat(ModifyOp op, const char* fmt, va_list ap) noexcept {
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size_t startAt = (op == ModifyOp::kAssign) ? size_t(0) : size();
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size_t remainingCapacity = capacity() - startAt;
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char buf[1024];
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int fmtResult;
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size_t outputSize;
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va_list apCopy;
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va_copy(apCopy, ap);
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if (remainingCapacity >= 128) {
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fmtResult = vsnprintf(data() + startAt, remainingCapacity, fmt, ap);
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outputSize = size_t(fmtResult);
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if (ASMJIT_LIKELY(outputSize <= remainingCapacity)) {
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_setSize(startAt + outputSize);
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return kErrorOk;
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}
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}
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else {
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fmtResult = vsnprintf(buf, ASMJIT_ARRAY_SIZE(buf), fmt, ap);
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outputSize = size_t(fmtResult);
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if (ASMJIT_LIKELY(outputSize < ASMJIT_ARRAY_SIZE(buf)))
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return _opString(op, buf, outputSize);
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}
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if (ASMJIT_UNLIKELY(fmtResult < 0))
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return DebugUtils::errored(kErrorInvalidState);
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char* p = prepare(op, outputSize);
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if (ASMJIT_UNLIKELY(!p))
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return DebugUtils::errored(kErrorOutOfMemory);
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fmtResult = vsnprintf(p, outputSize + 1, fmt, apCopy);
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ASMJIT_ASSERT(size_t(fmtResult) == outputSize);
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return kErrorOk;
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}
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Error String::truncate(size_t newSize) noexcept {
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if (isLargeOrExternal()) {
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if (newSize < _large.size) {
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_large.data[newSize] = '\0';
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_large.size = newSize;
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}
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}
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else {
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if (newSize < _type) {
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_small.data[newSize] = '\0';
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_small.type = uint8_t(newSize);
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}
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}
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return kErrorOk;
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}
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bool String::eq(const char* other, size_t size) const noexcept {
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const char* aData = data();
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const char* bData = other;
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size_t aSize = this->size();
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size_t bSize = size;
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if (bSize == SIZE_MAX) {
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size_t i;
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for (i = 0; i < aSize; i++)
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if (aData[i] != bData[i] || bData[i] == 0)
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return false;
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return bData[i] == 0;
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}
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else {
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if (aSize != bSize)
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return false;
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return ::memcmp(aData, bData, aSize) == 0;
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}
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}
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// String - Tests
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// ==============
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#if defined(ASMJIT_TEST)
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UNIT(core_string) {
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String s;
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EXPECT(s.isLargeOrExternal() == false);
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EXPECT(s.isExternal() == false);
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EXPECT(s.assign('a') == kErrorOk);
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EXPECT(s.size() == 1);
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EXPECT(s.capacity() == String::kSSOCapacity);
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EXPECT(s.data()[0] == 'a');
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EXPECT(s.data()[1] == '\0');
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EXPECT(s.eq("a") == true);
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EXPECT(s.eq("a", 1) == true);
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EXPECT(s.assignChars('b', 4) == kErrorOk);
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EXPECT(s.size() == 4);
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EXPECT(s.capacity() == String::kSSOCapacity);
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EXPECT(s.data()[0] == 'b');
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EXPECT(s.data()[1] == 'b');
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EXPECT(s.data()[2] == 'b');
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EXPECT(s.data()[3] == 'b');
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EXPECT(s.data()[4] == '\0');
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EXPECT(s.eq("bbbb") == true);
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EXPECT(s.eq("bbbb", 4) == true);
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EXPECT(s.assign("abc") == kErrorOk);
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EXPECT(s.size() == 3);
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EXPECT(s.capacity() == String::kSSOCapacity);
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EXPECT(s.data()[0] == 'a');
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EXPECT(s.data()[1] == 'b');
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EXPECT(s.data()[2] == 'c');
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EXPECT(s.data()[3] == '\0');
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EXPECT(s.eq("abc") == true);
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EXPECT(s.eq("abc", 3) == true);
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const char* large = "Large string that will not fit into SSO buffer";
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EXPECT(s.assign(large) == kErrorOk);
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EXPECT(s.isLargeOrExternal() == true);
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EXPECT(s.size() == strlen(large));
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EXPECT(s.capacity() > String::kSSOCapacity);
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EXPECT(s.eq(large) == true);
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EXPECT(s.eq(large, strlen(large)) == true);
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const char* additional = " (additional content)";
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EXPECT(s.isLargeOrExternal() == true);
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EXPECT(s.append(additional) == kErrorOk);
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EXPECT(s.size() == strlen(large) + strlen(additional));
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EXPECT(s.clear() == kErrorOk);
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EXPECT(s.size() == 0);
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EXPECT(s.empty() == true);
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EXPECT(s.data()[0] == '\0');
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EXPECT(s.isLargeOrExternal() == true); // Clear should never release the memory.
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EXPECT(s.appendUInt(1234) == kErrorOk);
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EXPECT(s.eq("1234") == true);
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EXPECT(s.assignUInt(0xFFFF, 16, 0, StringFormatFlags::kAlternate) == kErrorOk);
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EXPECT(s.eq("0xFFFF"));
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StringTmp<64> sTmp;
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EXPECT(sTmp.isLargeOrExternal());
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EXPECT(sTmp.isExternal());
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EXPECT(sTmp.appendChars(' ', 1000) == kErrorOk);
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EXPECT(!sTmp.isExternal());
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}
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#endif
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ASMJIT_END_NAMESPACE
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