You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
1.7 KiB
73 lines
1.7 KiB
12 years ago
|
// 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 "leveldb/env.h"
|
||
|
#include "leveldb/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 (size_t 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 ConsumeDecimalNumber(Slice* in, uint64_t* val) {
|
||
|
uint64_t v = 0;
|
||
|
int digits = 0;
|
||
|
while (!in->empty()) {
|
||
7 years ago
|
unsigned char c = (*in)[0];
|
||
12 years ago
|
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);
|
||
|
}
|
||
|
|
||
|
} // namespace leveldb
|