82 lines
1.8 KiB
C++
82 lines
1.8 KiB
C++
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "util/logging.h"
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "leveldb/env.h"
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#include "leveldb/slice.h"
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namespace leveldb {
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void AppendNumberTo(std::string* str, uint64_t num) {
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char buf[30];
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snprintf(buf, sizeof(buf), "%llu", (unsigned long long) num);
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str->append(buf);
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}
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void AppendEscapedStringTo(std::string* str, const Slice& value) {
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for (size_t i = 0; i < value.size(); i++) {
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char c = value[i];
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if (c >= ' ' && c <= '~') {
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str->push_back(c);
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} else {
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char buf[10];
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snprintf(buf, sizeof(buf), "\\x%02x",
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static_cast<unsigned int>(c) & 0xff);
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str->append(buf);
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}
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}
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}
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std::string NumberToString(uint64_t num) {
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std::string r;
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AppendNumberTo(&r, num);
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return r;
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}
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std::string EscapeString(const Slice& value) {
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std::string r;
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AppendEscapedStringTo(&r, value);
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return r;
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}
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bool ConsumeChar(Slice* in, char c) {
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if (!in->empty() && (*in)[0] == c) {
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in->remove_prefix(1);
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return true;
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} else {
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return false;
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}
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}
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bool ConsumeDecimalNumber(Slice* in, uint64_t* val) {
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uint64_t v = 0;
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int digits = 0;
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while (!in->empty()) {
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char c = (*in)[0];
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if (c >= '0' && c <= '9') {
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++digits;
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const int delta = (c - '0');
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static const uint64_t kMaxUint64 = ~static_cast<uint64_t>(0);
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if (v > kMaxUint64/10 ||
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(v == kMaxUint64/10 && delta > kMaxUint64%10)) {
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// Overflow
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return false;
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}
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v = (v * 10) + delta;
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in->remove_prefix(1);
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} else {
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break;
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}
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}
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*val = v;
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return (digits > 0);
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}
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} // namespace leveldb
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