Você não pode selecionar mais de 25 tópicos
Os tópicos devem começar com uma letra ou um número, podem incluir traços ('-') e podem ter até 35 caracteres.
81 linhas
1.8 KiB
81 linhas
1.8 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#include "util/logging.h"
|
|
|
|
#include <errno.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "include/env.h"
|
|
#include "include/slice.h"
|
|
|
|
namespace leveldb {
|
|
|
|
void AppendNumberTo(std::string* str, uint64_t num) {
|
|
char buf[30];
|
|
snprintf(buf, sizeof(buf), "%llu", (unsigned long long) num);
|
|
str->append(buf);
|
|
}
|
|
|
|
void AppendEscapedStringTo(std::string* str, const Slice& value) {
|
|
for (int i = 0; i < value.size(); i++) {
|
|
char c = value[i];
|
|
if (c >= ' ' && c <= '~') {
|
|
str->push_back(c);
|
|
} else {
|
|
char buf[10];
|
|
snprintf(buf, sizeof(buf), "\\x%02x",
|
|
static_cast<unsigned int>(c) & 0xff);
|
|
str->append(buf);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string NumberToString(uint64_t num) {
|
|
std::string r;
|
|
AppendNumberTo(&r, num);
|
|
return r;
|
|
}
|
|
|
|
std::string EscapeString(const Slice& value) {
|
|
std::string r;
|
|
AppendEscapedStringTo(&r, value);
|
|
return r;
|
|
}
|
|
|
|
bool ConsumeChar(Slice* in, char c) {
|
|
if (!in->empty() && (*in)[0] == c) {
|
|
in->remove_prefix(1);
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool ConsumeDecimalNumber(Slice* in, uint64_t* val) {
|
|
uint64_t v = 0;
|
|
int digits = 0;
|
|
while (!in->empty()) {
|
|
char c = (*in)[0];
|
|
if (c >= '0' && c <= '9') {
|
|
++digits;
|
|
const int delta = (c - '0');
|
|
static const uint64_t kMaxUint64 = ~static_cast<uint64_t>(0);
|
|
if (v > kMaxUint64/10 ||
|
|
(v == kMaxUint64/10 && delta > kMaxUint64%10)) {
|
|
// Overflow
|
|
return false;
|
|
}
|
|
v = (v * 10) + delta;
|
|
in->remove_prefix(1);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
*val = v;
|
|
return (digits > 0);
|
|
}
|
|
|
|
}
|