Summary: This is an effort to club all string related utility functions into one common place, in string_util, so that it is easier for everyone to know what string processing functions are available. Right now they seem to be spread out across multiple modules, like logging and options_helper. Check the sub-commits for easier reviewing. Closes https://github.com/facebook/rocksdb/pull/2094 Differential Revision: D4837730 Pulled By: sagar0 fbshipit-source-id: 344278amain
Sagar Vemuri
7 years ago
committed by
Facebook Github Bot
parent
1d068f6067
commit
343b59d6ee
@ -1,164 +0,0 @@ |
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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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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#ifndef __STDC_FORMAT_MACROS |
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#define __STDC_FORMAT_MACROS |
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#endif |
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#include <cmath> |
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#include <inttypes.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 "rocksdb/env.h" |
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#include "rocksdb/slice.h" |
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namespace rocksdb { |
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// for micros < 10ms, print "XX us".
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// for micros < 10sec, print "XX ms".
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// for micros >= 10 sec, print "XX sec".
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// for micros <= 1 hour, print Y:X M:S".
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// for micros > 1 hour, print Z:Y:X H:M:S".
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int AppendHumanMicros(uint64_t micros, char* output, int len, |
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bool fixed_format) { |
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if (micros < 10000 && !fixed_format) { |
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return snprintf(output, len, "%" PRIu64 " us", micros); |
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} else if (micros < 10000000 && !fixed_format) { |
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return snprintf(output, len, "%.3lf ms", |
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static_cast<double>(micros) / 1000); |
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} else if (micros < 1000000l * 60 && !fixed_format) { |
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return snprintf(output, len, "%.3lf sec", |
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static_cast<double>(micros) / 1000000); |
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} else if (micros < 1000000ll * 60 * 60 && !fixed_format) { |
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return snprintf(output, len, "%02" PRIu64 ":%05.3f M:S", |
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micros / 1000000 / 60, |
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static_cast<double>(micros % 60000000) / 1000000); |
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} else { |
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return snprintf(output, len, |
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"%02" PRIu64 ":%02" PRIu64 ":%05.3f H:M:S", |
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micros / 1000000 / 3600, |
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(micros / 1000000 / 60) % 60, |
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static_cast<double>(micros % 60000000) / 1000000); |
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} |
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} |
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// for sizes >=10TB, print "XXTB"
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// for sizes >=10GB, print "XXGB"
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// etc.
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// append file size summary to output and return the len
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int AppendHumanBytes(uint64_t bytes, char* output, int len) { |
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const uint64_t ull10 = 10; |
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if (bytes >= ull10 << 40) { |
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return snprintf(output, len, "%" PRIu64 "TB", bytes >> 40); |
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} else if (bytes >= ull10 << 30) { |
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return snprintf(output, len, "%" PRIu64 "GB", bytes >> 30); |
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} else if (bytes >= ull10 << 20) { |
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return snprintf(output, len, "%" PRIu64 "MB", bytes >> 20); |
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} else if (bytes >= ull10 << 10) { |
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return snprintf(output, len, "%" PRIu64 "KB", bytes >> 10); |
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} else { |
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return snprintf(output, len, "%" PRIu64 "B", bytes); |
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} |
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} |
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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), "%" PRIu64, 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 NumberToHumanString(int64_t num) { |
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char buf[19]; |
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int64_t absnum = num < 0 ? -num : num; |
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if (absnum < 10000) { |
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snprintf(buf, sizeof(buf), "%" PRIi64, num); |
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} else if (absnum < 10000000) { |
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snprintf(buf, sizeof(buf), "%" PRIi64 "K", num / 1000); |
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} else if (absnum < 10000000000LL) { |
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snprintf(buf, sizeof(buf), "%" PRIi64 "M", num / 1000000); |
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} else { |
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snprintf(buf, sizeof(buf), "%" PRIi64 "G", num / 1000000000); |
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} |
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return std::string(buf); |
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} |
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std::string BytesToHumanString(uint64_t bytes) { |
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const char* size_name[] = {"KB", "MB", "GB", "TB"}; |
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double final_size = static_cast<double>(bytes); |
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size_t size_idx; |
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// always start with KB
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final_size /= 1024; |
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size_idx = 0; |
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while (size_idx < 3 && final_size >= 1024) { |
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final_size /= 1024; |
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size_idx++; |
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} |
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char buf[20]; |
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snprintf(buf, sizeof(buf), "%.2f %s", final_size, size_name[size_idx]); |
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return std::string(buf); |
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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 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 unsigned 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 rocksdb
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