760 lines
21 KiB
C++
760 lines
21 KiB
C++
|
/*
|
||
|
|
* Copyright 2012-present Facebook, Inc.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <folly/String.h>
|
||
|
|
|
||
|
|
#include <cctype>
|
||
|
|
#include <cerrno>
|
||
|
|
#include <cstdarg>
|
||
|
|
#include <cstring>
|
||
|
|
#include <iterator>
|
||
|
|
#include <sstream>
|
||
|
|
#include <stdexcept>
|
||
|
|
|
||
|
|
#include <glog/logging.h>
|
||
|
|
|
||
|
|
#include <folly/Portability.h>
|
||
|
|
#include <folly/ScopeGuard.h>
|
||
|
|
#include <folly/container/Array.h>
|
||
|
|
|
||
|
|
namespace folly {
|
||
|
|
|
||
|
|
static_assert(IsConvertible<float>::value, "");
|
||
|
|
static_assert(IsConvertible<int>::value, "");
|
||
|
|
static_assert(IsConvertible<bool>::value, "");
|
||
|
|
static_assert(IsConvertible<int>::value, "");
|
||
|
|
static_assert(!IsConvertible<std::vector<int>>::value, "");
|
||
|
|
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
struct string_table_c_escape_make_item {
|
||
|
|
constexpr char operator()(std::size_t index) const {
|
||
|
|
// clang-format off
|
||
|
|
return
|
||
|
|
index == '"' ? '"' :
|
||
|
|
index == '\\' ? '\\' :
|
||
|
|
index == '?' ? '?' :
|
||
|
|
index == '\n' ? 'n' :
|
||
|
|
index == '\r' ? 'r' :
|
||
|
|
index == '\t' ? 't' :
|
||
|
|
index < 32 || index > 126 ? 'O' : // octal
|
||
|
|
'P'; // printable
|
||
|
|
// clang-format on
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
struct string_table_c_unescape_make_item {
|
||
|
|
constexpr char operator()(std::size_t index) const {
|
||
|
|
// clang-format off
|
||
|
|
return
|
||
|
|
index == '\'' ? '\'' :
|
||
|
|
index == '?' ? '?' :
|
||
|
|
index == '\\' ? '\\' :
|
||
|
|
index == '"' ? '"' :
|
||
|
|
index == 'a' ? '\a' :
|
||
|
|
index == 'b' ? '\b' :
|
||
|
|
index == 'f' ? '\f' :
|
||
|
|
index == 'n' ? '\n' :
|
||
|
|
index == 'r' ? '\r' :
|
||
|
|
index == 't' ? '\t' :
|
||
|
|
index == 'v' ? '\v' :
|
||
|
|
index >= '0' && index <= '7' ? 'O' : // octal
|
||
|
|
index == 'x' ? 'X' : // hex
|
||
|
|
'I'; // invalid
|
||
|
|
// clang-format on
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
struct string_table_hex_make_item {
|
||
|
|
constexpr unsigned char operator()(std::size_t index) const {
|
||
|
|
// clang-format off
|
||
|
|
return
|
||
|
|
index >= '0' && index <= '9' ? index - '0' :
|
||
|
|
index >= 'a' && index <= 'f' ? index - 'a' + 10 :
|
||
|
|
index >= 'A' && index <= 'F' ? index - 'A' + 10 :
|
||
|
|
16;
|
||
|
|
// clang-format on
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
struct string_table_uri_escape_make_item {
|
||
|
|
// 0 = passthrough
|
||
|
|
// 1 = unused
|
||
|
|
// 2 = safe in path (/)
|
||
|
|
// 3 = space (replace with '+' in query)
|
||
|
|
// 4 = always percent-encode
|
||
|
|
constexpr unsigned char operator()(std::size_t index) const {
|
||
|
|
// clang-format off
|
||
|
|
return
|
||
|
|
index >= '0' && index <= '9' ? 0 :
|
||
|
|
index >= 'A' && index <= 'Z' ? 0 :
|
||
|
|
index >= 'a' && index <= 'z' ? 0 :
|
||
|
|
index == '-' ? 0 :
|
||
|
|
index == '_' ? 0 :
|
||
|
|
index == '.' ? 0 :
|
||
|
|
index == '~' ? 0 :
|
||
|
|
index == '/' ? 2 :
|
||
|
|
index == ' ' ? 3 :
|
||
|
|
4;
|
||
|
|
// clang-format on
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
FOLLY_STORAGE_CONSTEXPR decltype(cEscapeTable) cEscapeTable =
|
||
|
|
make_array_with<256>(string_table_c_escape_make_item{});
|
||
|
|
FOLLY_STORAGE_CONSTEXPR decltype(cUnescapeTable) cUnescapeTable =
|
||
|
|
make_array_with<256>(string_table_c_unescape_make_item{});
|
||
|
|
FOLLY_STORAGE_CONSTEXPR decltype(hexTable) hexTable =
|
||
|
|
make_array_with<256>(string_table_hex_make_item{});
|
||
|
|
FOLLY_STORAGE_CONSTEXPR decltype(uriEscapeTable) uriEscapeTable =
|
||
|
|
make_array_with<256>(string_table_uri_escape_make_item{});
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
static inline bool is_oddspace(char c) {
|
||
|
|
return c == '\n' || c == '\t' || c == '\r';
|
||
|
|
}
|
||
|
|
|
||
|
|
StringPiece ltrimWhitespace(StringPiece sp) {
|
||
|
|
// Spaces other than ' ' characters are less common but should be
|
||
|
|
// checked. This configuration where we loop on the ' '
|
||
|
|
// separately from oddspaces was empirically fastest.
|
||
|
|
|
||
|
|
while (true) {
|
||
|
|
while (!sp.empty() && sp.front() == ' ') {
|
||
|
|
sp.pop_front();
|
||
|
|
}
|
||
|
|
if (!sp.empty() && is_oddspace(sp.front())) {
|
||
|
|
sp.pop_front();
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
return sp;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
StringPiece rtrimWhitespace(StringPiece sp) {
|
||
|
|
// Spaces other than ' ' characters are less common but should be
|
||
|
|
// checked. This configuration where we loop on the ' '
|
||
|
|
// separately from oddspaces was empirically fastest.
|
||
|
|
|
||
|
|
while (true) {
|
||
|
|
while (!sp.empty() && sp.back() == ' ') {
|
||
|
|
sp.pop_back();
|
||
|
|
}
|
||
|
|
if (!sp.empty() && is_oddspace(sp.back())) {
|
||
|
|
sp.pop_back();
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
return sp;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
int stringAppendfImplHelper(
|
||
|
|
char* buf,
|
||
|
|
size_t bufsize,
|
||
|
|
const char* format,
|
||
|
|
va_list args) {
|
||
|
|
va_list args_copy;
|
||
|
|
va_copy(args_copy, args);
|
||
|
|
int bytes_used = vsnprintf(buf, bufsize, format, args_copy);
|
||
|
|
va_end(args_copy);
|
||
|
|
return bytes_used;
|
||
|
|
}
|
||
|
|
|
||
|
|
void stringAppendfImpl(std::string& output, const char* format, va_list args) {
|
||
|
|
// Very simple; first, try to avoid an allocation by using an inline
|
||
|
|
// buffer. If that fails to hold the output string, allocate one on
|
||
|
|
// the heap, use it instead.
|
||
|
|
//
|
||
|
|
// It is hard to guess the proper size of this buffer; some
|
||
|
|
// heuristics could be based on the number of format characters, or
|
||
|
|
// static analysis of a codebase. Or, we can just pick a number
|
||
|
|
// that seems big enough for simple cases (say, one line of text on
|
||
|
|
// a terminal) without being large enough to be concerning as a
|
||
|
|
// stack variable.
|
||
|
|
std::array<char, 128> inline_buffer;
|
||
|
|
|
||
|
|
int bytes_used = stringAppendfImplHelper(
|
||
|
|
inline_buffer.data(), inline_buffer.size(), format, args);
|
||
|
|
if (bytes_used < 0) {
|
||
|
|
throw std::runtime_error(to<std::string>(
|
||
|
|
"Invalid format string; snprintf returned negative "
|
||
|
|
"with format string: ",
|
||
|
|
format));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (static_cast<size_t>(bytes_used) < inline_buffer.size()) {
|
||
|
|
output.append(inline_buffer.data(), size_t(bytes_used));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Couldn't fit. Heap allocate a buffer, oh well.
|
||
|
|
std::unique_ptr<char[]> heap_buffer(new char[size_t(bytes_used + 1)]);
|
||
|
|
int final_bytes_used = stringAppendfImplHelper(
|
||
|
|
heap_buffer.get(), size_t(bytes_used + 1), format, args);
|
||
|
|
// The second call can take fewer bytes if, for example, we were printing a
|
||
|
|
// string buffer with null-terminating char using a width specifier -
|
||
|
|
// vsnprintf("%.*s", buf.size(), buf)
|
||
|
|
CHECK(bytes_used >= final_bytes_used);
|
||
|
|
|
||
|
|
// We don't keep the trailing '\0' in our output string
|
||
|
|
output.append(heap_buffer.get(), size_t(final_bytes_used));
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
std::string stringPrintf(const char* format, ...) {
|
||
|
|
va_list ap;
|
||
|
|
va_start(ap, format);
|
||
|
|
SCOPE_EXIT {
|
||
|
|
va_end(ap);
|
||
|
|
};
|
||
|
|
return stringVPrintf(format, ap);
|
||
|
|
}
|
||
|
|
|
||
|
|
std::string stringVPrintf(const char* format, va_list ap) {
|
||
|
|
std::string ret;
|
||
|
|
stringAppendfImpl(ret, format, ap);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Basic declarations; allow for parameters of strings and string
|
||
|
|
// pieces to be specified.
|
||
|
|
std::string& stringAppendf(std::string* output, const char* format, ...) {
|
||
|
|
va_list ap;
|
||
|
|
va_start(ap, format);
|
||
|
|
SCOPE_EXIT {
|
||
|
|
va_end(ap);
|
||
|
|
};
|
||
|
|
return stringVAppendf(output, format, ap);
|
||
|
|
}
|
||
|
|
|
||
|
|
std::string&
|
||
|
|
stringVAppendf(std::string* output, const char* format, va_list ap) {
|
||
|
|
stringAppendfImpl(*output, format, ap);
|
||
|
|
return *output;
|
||
|
|
}
|
||
|
|
|
||
|
|
void stringPrintf(std::string* output, const char* format, ...) {
|
||
|
|
va_list ap;
|
||
|
|
va_start(ap, format);
|
||
|
|
SCOPE_EXIT {
|
||
|
|
va_end(ap);
|
||
|
|
};
|
||
|
|
return stringVPrintf(output, format, ap);
|
||
|
|
}
|
||
|
|
|
||
|
|
void stringVPrintf(std::string* output, const char* format, va_list ap) {
|
||
|
|
output->clear();
|
||
|
|
stringAppendfImpl(*output, format, ap);
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
struct PrettySuffix {
|
||
|
|
const char* suffix;
|
||
|
|
double val;
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyTimeSuffixes[] = {
|
||
|
|
{"s ", 1e0L},
|
||
|
|
{"ms", 1e-3L},
|
||
|
|
{"us", 1e-6L},
|
||
|
|
{"ns", 1e-9L},
|
||
|
|
{"ps", 1e-12L},
|
||
|
|
{"s ", 0},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyTimeHmsSuffixes[] = {
|
||
|
|
{"h ", 60L * 60L},
|
||
|
|
{"m ", 60L},
|
||
|
|
{"s ", 1e0L},
|
||
|
|
{"ms", 1e-3L},
|
||
|
|
{"us", 1e-6L},
|
||
|
|
{"ns", 1e-9L},
|
||
|
|
{"ps", 1e-12L},
|
||
|
|
{"s ", 0},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyBytesMetricSuffixes[] = {
|
||
|
|
{"EB", 1e18L},
|
||
|
|
{"PB", 1e15L},
|
||
|
|
{"TB", 1e12L},
|
||
|
|
{"GB", 1e9L},
|
||
|
|
{"MB", 1e6L},
|
||
|
|
{"kB", 1e3L},
|
||
|
|
{"B ", 0L},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyBytesBinarySuffixes[] = {
|
||
|
|
{"EB", int64_t(1) << 60},
|
||
|
|
{"PB", int64_t(1) << 50},
|
||
|
|
{"TB", int64_t(1) << 40},
|
||
|
|
{"GB", int64_t(1) << 30},
|
||
|
|
{"MB", int64_t(1) << 20},
|
||
|
|
{"kB", int64_t(1) << 10},
|
||
|
|
{"B ", 0L},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyBytesBinaryIECSuffixes[] = {
|
||
|
|
{"EiB", int64_t(1) << 60},
|
||
|
|
{"PiB", int64_t(1) << 50},
|
||
|
|
{"TiB", int64_t(1) << 40},
|
||
|
|
{"GiB", int64_t(1) << 30},
|
||
|
|
{"MiB", int64_t(1) << 20},
|
||
|
|
{"KiB", int64_t(1) << 10},
|
||
|
|
{"B ", 0L},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyUnitsMetricSuffixes[] = {
|
||
|
|
{"qntl", 1e18L},
|
||
|
|
{"qdrl", 1e15L},
|
||
|
|
{"tril", 1e12L},
|
||
|
|
{"bil", 1e9L},
|
||
|
|
{"M", 1e6L},
|
||
|
|
{"k", 1e3L},
|
||
|
|
{" ", 0},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyUnitsBinarySuffixes[] = {
|
||
|
|
{"E", int64_t(1) << 60},
|
||
|
|
{"P", int64_t(1) << 50},
|
||
|
|
{"T", int64_t(1) << 40},
|
||
|
|
{"G", int64_t(1) << 30},
|
||
|
|
{"M", int64_t(1) << 20},
|
||
|
|
{"k", int64_t(1) << 10},
|
||
|
|
{" ", 0},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettyUnitsBinaryIECSuffixes[] = {
|
||
|
|
{"Ei", int64_t(1) << 60},
|
||
|
|
{"Pi", int64_t(1) << 50},
|
||
|
|
{"Ti", int64_t(1) << 40},
|
||
|
|
{"Gi", int64_t(1) << 30},
|
||
|
|
{"Mi", int64_t(1) << 20},
|
||
|
|
{"Ki", int64_t(1) << 10},
|
||
|
|
{" ", 0},
|
||
|
|
{nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix kPrettySISuffixes[] = {
|
||
|
|
{"Y", 1e24L}, {"Z", 1e21L}, {"E", 1e18L}, {"P", 1e15L}, {"T", 1e12L},
|
||
|
|
{"G", 1e9L}, {"M", 1e6L}, {"k", 1e3L}, {"h", 1e2L}, {"da", 1e1L},
|
||
|
|
{"d", 1e-1L}, {"c", 1e-2L}, {"m", 1e-3L}, {"u", 1e-6L}, {"n", 1e-9L},
|
||
|
|
{"p", 1e-12L}, {"f", 1e-15L}, {"a", 1e-18L}, {"z", 1e-21L}, {"y", 1e-24L},
|
||
|
|
{" ", 0}, {nullptr, 0},
|
||
|
|
};
|
||
|
|
|
||
|
|
const PrettySuffix* const kPrettySuffixes[PRETTY_NUM_TYPES] = {
|
||
|
|
kPrettyTimeSuffixes,
|
||
|
|
kPrettyTimeHmsSuffixes,
|
||
|
|
kPrettyBytesMetricSuffixes,
|
||
|
|
kPrettyBytesBinarySuffixes,
|
||
|
|
kPrettyBytesBinaryIECSuffixes,
|
||
|
|
kPrettyUnitsMetricSuffixes,
|
||
|
|
kPrettyUnitsBinarySuffixes,
|
||
|
|
kPrettyUnitsBinaryIECSuffixes,
|
||
|
|
kPrettySISuffixes,
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
std::string prettyPrint(double val, PrettyType type, bool addSpace) {
|
||
|
|
char buf[100];
|
||
|
|
|
||
|
|
// pick the suffixes to use
|
||
|
|
assert(type >= 0);
|
||
|
|
assert(type < PRETTY_NUM_TYPES);
|
||
|
|
const PrettySuffix* suffixes = kPrettySuffixes[type];
|
||
|
|
|
||
|
|
// find the first suffix we're bigger than -- then use it
|
||
|
|
double abs_val = fabs(val);
|
||
|
|
for (int i = 0; suffixes[i].suffix; ++i) {
|
||
|
|
if (abs_val >= suffixes[i].val) {
|
||
|
|
snprintf(
|
||
|
|
buf,
|
||
|
|
sizeof buf,
|
||
|
|
"%.4g%s%s",
|
||
|
|
(suffixes[i].val ? (val / suffixes[i].val) : val),
|
||
|
|
(addSpace ? " " : ""),
|
||
|
|
suffixes[i].suffix);
|
||
|
|
return std::string(buf);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// no suffix, we've got a tiny value -- just print it in sci-notation
|
||
|
|
snprintf(buf, sizeof buf, "%.4g", val);
|
||
|
|
return std::string(buf);
|
||
|
|
}
|
||
|
|
|
||
|
|
// TODO:
|
||
|
|
// 1) Benchmark & optimize
|
||
|
|
double prettyToDouble(
|
||
|
|
folly::StringPiece* const prettyString,
|
||
|
|
const PrettyType type) {
|
||
|
|
double value = folly::to<double>(prettyString);
|
||
|
|
while (prettyString->size() > 0 && std::isspace(prettyString->front())) {
|
||
|
|
prettyString->advance(1); // Skipping spaces between number and suffix
|
||
|
|
}
|
||
|
|
const PrettySuffix* suffixes = kPrettySuffixes[type];
|
||
|
|
int longestPrefixLen = -1;
|
||
|
|
int bestPrefixId = -1;
|
||
|
|
for (int j = 0; suffixes[j].suffix; ++j) {
|
||
|
|
if (suffixes[j].suffix[0] == ' ') { // Checking for " " -> number rule.
|
||
|
|
if (longestPrefixLen == -1) {
|
||
|
|
longestPrefixLen = 0; // No characters to skip
|
||
|
|
bestPrefixId = j;
|
||
|
|
}
|
||
|
|
} else if (prettyString->startsWith(suffixes[j].suffix)) {
|
||
|
|
int suffixLen = int(strlen(suffixes[j].suffix));
|
||
|
|
// We are looking for a longest suffix matching prefix of the string
|
||
|
|
// after numeric value. We need this in case suffixes have common prefix.
|
||
|
|
if (suffixLen > longestPrefixLen) {
|
||
|
|
longestPrefixLen = suffixLen;
|
||
|
|
bestPrefixId = j;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (bestPrefixId == -1) { // No valid suffix rule found
|
||
|
|
throw std::invalid_argument(folly::to<std::string>(
|
||
|
|
"Unable to parse suffix \"", *prettyString, "\""));
|
||
|
|
}
|
||
|
|
prettyString->advance(size_t(longestPrefixLen));
|
||
|
|
return suffixes[bestPrefixId].val ? value * suffixes[bestPrefixId].val
|
||
|
|
: value;
|
||
|
|
}
|
||
|
|
|
||
|
|
double prettyToDouble(folly::StringPiece prettyString, const PrettyType type) {
|
||
|
|
double result = prettyToDouble(&prettyString, type);
|
||
|
|
detail::enforceWhitespace(prettyString);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
std::string hexDump(const void* ptr, size_t size) {
|
||
|
|
std::ostringstream os;
|
||
|
|
hexDump(ptr, size, std::ostream_iterator<StringPiece>(os, "\n"));
|
||
|
|
return os.str();
|
||
|
|
}
|
||
|
|
|
||
|
|
fbstring errnoStr(int err) {
|
||
|
|
int savedErrno = errno;
|
||
|
|
|
||
|
|
// Ensure that we reset errno upon exit.
|
||
|
|
auto guard(makeGuard([&] { errno = savedErrno; }));
|
||
|
|
|
||
|
|
char buf[1024];
|
||
|
|
buf[0] = '\0';
|
||
|
|
|
||
|
|
fbstring result;
|
||
|
|
|
||
|
|
// https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/strerror_r.3.html
|
||
|
|
// http://www.kernel.org/doc/man-pages/online/pages/man3/strerror.3.html
|
||
|
|
#if defined(_WIN32) && (defined(__MINGW32__) || defined(_MSC_VER))
|
||
|
|
// mingw64 has no strerror_r, but Windows has strerror_s, which C11 added
|
||
|
|
// as well. So maybe we should use this across all platforms (together
|
||
|
|
// with strerrorlen_s). Note strerror_r and _s have swapped args.
|
||
|
|
int r = strerror_s(buf, sizeof(buf), err);
|
||
|
|
if (r != 0) {
|
||
|
|
result = to<fbstring>(
|
||
|
|
"Unknown error ", err, " (strerror_r failed with error ", errno, ")");
|
||
|
|
} else {
|
||
|
|
result.assign(buf);
|
||
|
|
}
|
||
|
|
#elif FOLLY_HAVE_XSI_STRERROR_R || defined(__APPLE__)
|
||
|
|
|
||
|
|
// Using XSI-compatible strerror_r
|
||
|
|
int r = strerror_r(err, buf, sizeof(buf));
|
||
|
|
|
||
|
|
// OSX/FreeBSD use EINVAL and Linux uses -1 so just check for non-zero
|
||
|
|
if (r != 0) {
|
||
|
|
result = to<fbstring>(
|
||
|
|
"Unknown error ", err, " (strerror_r failed with error ", errno, ")");
|
||
|
|
} else {
|
||
|
|
result.assign(buf);
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
// Using GNU strerror_r
|
||
|
|
result.assign(strerror_r(err, buf, sizeof(buf)));
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
void toLowerAscii8(char& c) {
|
||
|
|
// Branchless tolower, based on the input-rotating trick described
|
||
|
|
// at http://www.azillionmonkeys.com/qed/asmexample.html
|
||
|
|
//
|
||
|
|
// This algorithm depends on an observation: each uppercase
|
||
|
|
// ASCII character can be converted to its lowercase equivalent
|
||
|
|
// by adding 0x20.
|
||
|
|
|
||
|
|
// Step 1: Clear the high order bit. We'll deal with it in Step 5.
|
||
|
|
uint8_t rotated = uint8_t(c & 0x7f);
|
||
|
|
// Currently, the value of rotated, as a function of the original c is:
|
||
|
|
// below 'A': 0- 64
|
||
|
|
// 'A'-'Z': 65- 90
|
||
|
|
// above 'Z': 91-127
|
||
|
|
|
||
|
|
// Step 2: Add 0x25 (37)
|
||
|
|
rotated += 0x25;
|
||
|
|
// Now the value of rotated, as a function of the original c is:
|
||
|
|
// below 'A': 37-101
|
||
|
|
// 'A'-'Z': 102-127
|
||
|
|
// above 'Z': 128-164
|
||
|
|
|
||
|
|
// Step 3: clear the high order bit
|
||
|
|
rotated &= 0x7f;
|
||
|
|
// below 'A': 37-101
|
||
|
|
// 'A'-'Z': 102-127
|
||
|
|
// above 'Z': 0- 36
|
||
|
|
|
||
|
|
// Step 4: Add 0x1a (26)
|
||
|
|
rotated += 0x1a;
|
||
|
|
// below 'A': 63-127
|
||
|
|
// 'A'-'Z': 128-153
|
||
|
|
// above 'Z': 25- 62
|
||
|
|
|
||
|
|
// At this point, note that only the uppercase letters have been
|
||
|
|
// transformed into values with the high order bit set (128 and above).
|
||
|
|
|
||
|
|
// Step 5: Shift the high order bit 2 spaces to the right: the spot
|
||
|
|
// where the only 1 bit in 0x20 is. But first, how we ignored the
|
||
|
|
// high order bit of the original c in step 1? If that bit was set,
|
||
|
|
// we may have just gotten a false match on a value in the range
|
||
|
|
// 128+'A' to 128+'Z'. To correct this, need to clear the high order
|
||
|
|
// bit of rotated if the high order bit of c is set. Since we don't
|
||
|
|
// care about the other bits in rotated, the easiest thing to do
|
||
|
|
// is invert all the bits in c and bitwise-and them with rotated.
|
||
|
|
rotated &= ~c;
|
||
|
|
rotated >>= 2;
|
||
|
|
|
||
|
|
// Step 6: Apply a mask to clear everything except the 0x20 bit
|
||
|
|
// in rotated.
|
||
|
|
rotated &= 0x20;
|
||
|
|
|
||
|
|
// At this point, rotated is 0x20 if c is 'A'-'Z' and 0x00 otherwise
|
||
|
|
|
||
|
|
// Step 7: Add rotated to c
|
||
|
|
c += char(rotated);
|
||
|
|
}
|
||
|
|
|
||
|
|
void toLowerAscii32(uint32_t& c) {
|
||
|
|
// Besides being branchless, the algorithm in toLowerAscii8() has another
|
||
|
|
// interesting property: None of the addition operations will cause
|
||
|
|
// an overflow in the 8-bit value. So we can pack four 8-bit values
|
||
|
|
// into a uint32_t and run each operation on all four values in parallel
|
||
|
|
// without having to use any CPU-specific SIMD instructions.
|
||
|
|
uint32_t rotated = c & uint32_t(0x7f7f7f7fL);
|
||
|
|
rotated += uint32_t(0x25252525L);
|
||
|
|
rotated &= uint32_t(0x7f7f7f7fL);
|
||
|
|
rotated += uint32_t(0x1a1a1a1aL);
|
||
|
|
|
||
|
|
// Step 5 involves a shift, so some bits will spill over from each
|
||
|
|
// 8-bit value into the next. But that's okay, because they're bits
|
||
|
|
// that will be cleared by the mask in step 6 anyway.
|
||
|
|
rotated &= ~c;
|
||
|
|
rotated >>= 2;
|
||
|
|
rotated &= uint32_t(0x20202020L);
|
||
|
|
c += rotated;
|
||
|
|
}
|
||
|
|
|
||
|
|
void toLowerAscii64(uint64_t& c) {
|
||
|
|
// 64-bit version of toLower32
|
||
|
|
uint64_t rotated = c & uint64_t(0x7f7f7f7f7f7f7f7fL);
|
||
|
|
rotated += uint64_t(0x2525252525252525L);
|
||
|
|
rotated &= uint64_t(0x7f7f7f7f7f7f7f7fL);
|
||
|
|
rotated += uint64_t(0x1a1a1a1a1a1a1a1aL);
|
||
|
|
rotated &= ~c;
|
||
|
|
rotated >>= 2;
|
||
|
|
rotated &= uint64_t(0x2020202020202020L);
|
||
|
|
c += rotated;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
void toLowerAscii(char* str, size_t length) {
|
||
|
|
static const size_t kAlignMask64 = 7;
|
||
|
|
static const size_t kAlignMask32 = 3;
|
||
|
|
|
||
|
|
// Convert a character at a time until we reach an address that
|
||
|
|
// is at least 32-bit aligned
|
||
|
|
size_t n = (size_t)str;
|
||
|
|
n &= kAlignMask32;
|
||
|
|
n = std::min(n, length);
|
||
|
|
size_t offset = 0;
|
||
|
|
if (n != 0) {
|
||
|
|
n = std::min(4 - n, length);
|
||
|
|
do {
|
||
|
|
toLowerAscii8(str[offset]);
|
||
|
|
offset++;
|
||
|
|
} while (offset < n);
|
||
|
|
}
|
||
|
|
|
||
|
|
n = (size_t)(str + offset);
|
||
|
|
n &= kAlignMask64;
|
||
|
|
if ((n != 0) && (offset + 4 <= length)) {
|
||
|
|
// The next address is 32-bit aligned but not 64-bit aligned.
|
||
|
|
// Convert the next 4 bytes in order to get to the 64-bit aligned
|
||
|
|
// part of the input.
|
||
|
|
toLowerAscii32(*(uint32_t*)(str + offset));
|
||
|
|
offset += 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert 8 characters at a time
|
||
|
|
while (offset + 8 <= length) {
|
||
|
|
toLowerAscii64(*(uint64_t*)(str + offset));
|
||
|
|
offset += 8;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert 4 characters at a time
|
||
|
|
while (offset + 4 <= length) {
|
||
|
|
toLowerAscii32(*(uint32_t*)(str + offset));
|
||
|
|
offset += 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert any characters remaining after the last 4-byte aligned group
|
||
|
|
while (offset < length) {
|
||
|
|
toLowerAscii8(str[offset]);
|
||
|
|
offset++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
size_t
|
||
|
|
hexDumpLine(const void* ptr, size_t offset, size_t size, std::string& line) {
|
||
|
|
static char hexValues[] = "0123456789abcdef";
|
||
|
|
// Line layout:
|
||
|
|
// 8: address
|
||
|
|
// 1: space
|
||
|
|
// (1+2)*16: hex bytes, each preceded by a space
|
||
|
|
// 1: space separating the two halves
|
||
|
|
// 3: " |"
|
||
|
|
// 16: characters
|
||
|
|
// 1: "|"
|
||
|
|
// Total: 78
|
||
|
|
line.clear();
|
||
|
|
line.reserve(78);
|
||
|
|
const uint8_t* p = reinterpret_cast<const uint8_t*>(ptr) + offset;
|
||
|
|
size_t n = std::min(size - offset, size_t(16));
|
||
|
|
line.push_back(hexValues[(offset >> 28) & 0xf]);
|
||
|
|
line.push_back(hexValues[(offset >> 24) & 0xf]);
|
||
|
|
line.push_back(hexValues[(offset >> 20) & 0xf]);
|
||
|
|
line.push_back(hexValues[(offset >> 16) & 0xf]);
|
||
|
|
line.push_back(hexValues[(offset >> 12) & 0xf]);
|
||
|
|
line.push_back(hexValues[(offset >> 8) & 0xf]);
|
||
|
|
line.push_back(hexValues[(offset >> 4) & 0xf]);
|
||
|
|
line.push_back(hexValues[offset & 0xf]);
|
||
|
|
line.push_back(' ');
|
||
|
|
|
||
|
|
for (size_t i = 0; i < n; i++) {
|
||
|
|
if (i == 8) {
|
||
|
|
line.push_back(' ');
|
||
|
|
}
|
||
|
|
|
||
|
|
line.push_back(' ');
|
||
|
|
line.push_back(hexValues[(p[i] >> 4) & 0xf]);
|
||
|
|
line.push_back(hexValues[p[i] & 0xf]);
|
||
|
|
}
|
||
|
|
|
||
|
|
// 3 spaces for each byte we're not printing, one separating the halves
|
||
|
|
// if necessary
|
||
|
|
line.append(3 * (16 - n) + (n <= 8), ' ');
|
||
|
|
line.append(" |");
|
||
|
|
|
||
|
|
for (size_t i = 0; i < n; i++) {
|
||
|
|
char c = (p[i] >= 32 && p[i] <= 126 ? static_cast<char>(p[i]) : '.');
|
||
|
|
line.push_back(c);
|
||
|
|
}
|
||
|
|
line.append(16 - n, ' ');
|
||
|
|
line.push_back('|');
|
||
|
|
DCHECK_EQ(line.size(), 78u);
|
||
|
|
|
||
|
|
return n;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
std::string stripLeftMargin(std::string s) {
|
||
|
|
std::vector<StringPiece> pieces;
|
||
|
|
split("\n", s, pieces);
|
||
|
|
auto piecer = range(pieces);
|
||
|
|
|
||
|
|
auto piece = (piecer.end() - 1);
|
||
|
|
auto needle = std::find_if(piece->begin(), piece->end(), [](char c) {
|
||
|
|
return c != ' ' && c != '\t';
|
||
|
|
});
|
||
|
|
if (needle == piece->end()) {
|
||
|
|
(piecer.end() - 1)->clear();
|
||
|
|
}
|
||
|
|
piece = piecer.begin();
|
||
|
|
needle = std::find_if(piece->begin(), piece->end(), [](char c) {
|
||
|
|
return c != ' ' && c != '\t';
|
||
|
|
});
|
||
|
|
if (needle == piece->end()) {
|
||
|
|
piecer.erase(piecer.begin(), piecer.begin() + 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
const auto sentinel = std::numeric_limits<size_t>::max();
|
||
|
|
auto indent = sentinel;
|
||
|
|
size_t max_length = 0;
|
||
|
|
for (piece = piecer.begin(); piece != piecer.end(); piece++) {
|
||
|
|
needle = std::find_if(piece->begin(), piece->end(), [](char c) {
|
||
|
|
return c != ' ' && c != '\t';
|
||
|
|
});
|
||
|
|
if (needle != piece->end()) {
|
||
|
|
indent = std::min<size_t>(indent, size_t(needle - piece->begin()));
|
||
|
|
} else {
|
||
|
|
max_length = std::max<size_t>(piece->size(), max_length);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
indent = indent == sentinel ? max_length : indent;
|
||
|
|
for (piece = piecer.begin(); piece != piecer.end(); piece++) {
|
||
|
|
if (piece->size() < indent) {
|
||
|
|
piece->clear();
|
||
|
|
} else {
|
||
|
|
piece->erase(piece->begin(), piece->begin() + indent);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return join("\n", piecer);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace folly
|
||
|
|
|
||
|
|
#ifdef FOLLY_DEFINED_DMGL
|
||
|
|
#undef FOLLY_DEFINED_DMGL
|
||
|
|
#undef DMGL_NO_OPTS
|
||
|
|
#undef DMGL_PARAMS
|
||
|
|
#undef DMGL_ANSI
|
||
|
|
#undef DMGL_JAVA
|
||
|
|
#undef DMGL_VERBOSE
|
||
|
|
#undef DMGL_TYPES
|
||
|
|
#undef DMGL_RET_POSTFIX
|
||
|
|
#endif
|