// 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()) { 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); } } // namespace leveldb