v8/src/utils.cc

93 lines
3.1 KiB
C++

// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdarg.h>
#include "../include/v8stdint.h"
#include "checks.h"
#include "utils.h"
namespace v8 {
namespace internal {
SimpleStringBuilder::SimpleStringBuilder(int size) {
buffer_ = Vector<char>::New(size);
position_ = 0;
}
void SimpleStringBuilder::AddString(const char* s) {
AddSubstring(s, StrLength(s));
}
void SimpleStringBuilder::AddSubstring(const char* s, int n) {
ASSERT(!is_finalized() && position_ + n < buffer_.length());
ASSERT(static_cast<size_t>(n) <= strlen(s));
memcpy(&buffer_[position_], s, n * kCharSize);
position_ += n;
}
void SimpleStringBuilder::AddPadding(char c, int count) {
for (int i = 0; i < count; i++) {
AddCharacter(c);
}
}
void SimpleStringBuilder::AddDecimalInteger(int32_t value) {
uint32_t number = static_cast<uint32_t>(value);
if (value < 0) {
AddCharacter('-');
number = static_cast<uint32_t>(-value);
}
int digits = 1;
for (uint32_t factor = 10; digits < 10; digits++, factor *= 10) {
if (factor > number) break;
}
position_ += digits;
for (int i = 1; i <= digits; i++) {
buffer_[position_ - i] = '0' + static_cast<char>(number % 10);
number /= 10;
}
}
char* SimpleStringBuilder::Finalize() {
ASSERT(!is_finalized() && position_ < buffer_.length());
buffer_[position_] = '\0';
// Make sure nobody managed to add a 0-character to the
// buffer while building the string.
ASSERT(strlen(buffer_.start()) == static_cast<size_t>(position_));
position_ = -1;
ASSERT(is_finalized());
return buffer_.start();
}
} } // namespace v8::internal