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Add string_number_conversion and its test.

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This includes the StringToNumber() function, both int and unsigned int variants.

Similar functionality is available in base, but it is unsuitable for
applications where a number’s base may be determined based on an "0x" or
"0X" prefix (hexadecimal) or an "0" prefix (octal).

TEST=util_test StringNumberConversion.*
R=rsesek@chromium.org

Review URL: https://codereview.chromium.org/557033002
This commit is contained in:
Mark Mentovai 2014-09-10 15:30:11 -04:00
parent 7fdc7f277e
commit 10d1b76b90
4 changed files with 441 additions and 0 deletions
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157
util/stdlib/string_number_conversion.cc Normal file
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// Copyright 2014 The Crashpad Authors. All rights reserved.
//
// 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 "util/stdlib/string_number_conversion.h"
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <limits>
#include "base/basictypes.h"
#include "base/logging.h"
#include "util/stdlib/cxx.h"
// CONSTEXPR_COMPILE_ASSERT will be a normal COMPILE_ASSERT if the C++ library
// is the C++11 library. If using an older C++ library when compiling C++11
// code, the std::numeric_limits<>::min() and max() functions will not be
// marked as constexpr, and thus won’t be usable with C++11’s static_assert().
// In that case, a run-time CHECK() will have to do.
#if CXX_LIBRARY_VERSION >= 2011
#define CONSTEXPR_COMPILE_ASSERT(condition, message) \
COMPILE_ASSERT(condition, message)
#else
#define CONSTEXPR_COMPILE_ASSERT(condition, message) CHECK(condition)
#endif
namespace {
template <typename TIntType, typename TLongType>
struct StringToIntegerTraits {
typedef TIntType IntType;
typedef TLongType LongType;
static void TypeCheck() {
COMPILE_ASSERT(std::numeric_limits<TIntType>::is_integer &&
std::numeric_limits<TLongType>::is_integer,
IntType_and_LongType_must_be_integer);
COMPILE_ASSERT(std::numeric_limits<TIntType>::is_signed ==
std::numeric_limits<TLongType>::is_signed,
IntType_and_LongType_signedness_must_agree);
CONSTEXPR_COMPILE_ASSERT(std::numeric_limits<TIntType>::min() >=
std::numeric_limits<TLongType>::min() &&
std::numeric_limits<TIntType>::min() <
std::numeric_limits<TLongType>::max(),
IntType_min_must_be_in_LongType_range);
CONSTEXPR_COMPILE_ASSERT(std::numeric_limits<TIntType>::max() >
std::numeric_limits<TLongType>::min() &&
std::numeric_limits<TIntType>::max() <=
std::numeric_limits<TLongType>::max(),
IntType_max_must_be_in_LongType_range);
}
};
template <typename TIntType, typename TLongType>
struct StringToSignedIntegerTraits
: public StringToIntegerTraits<TIntType, TLongType> {
static void TypeCheck() {
COMPILE_ASSERT(std::numeric_limits<TIntType>::is_signed,
StringToSignedTraits_IntType_must_be_signed);
return super::TypeCheck();
}
static bool IsNegativeOverflow(TLongType value) {
return value < std::numeric_limits<TIntType>::min();
}
private:
typedef StringToIntegerTraits<TIntType, TLongType> super;
};
template <typename TIntType, typename TLongType>
struct StringToUnsignedIntegerTraits
: public StringToIntegerTraits<TIntType, TLongType> {
static void TypeCheck() {
COMPILE_ASSERT(!std::numeric_limits<TIntType>::is_signed,
StringToUnsignedTraits_IntType_must_be_unsigned);
return super::TypeCheck();
}
static bool IsNegativeOverflow(TLongType value) { return false; }
private:
typedef StringToIntegerTraits<TIntType, TLongType> super;
};
struct StringToIntTraits : public StringToSignedIntegerTraits<int, long> {
static LongType Convert(const char* str, char** end, int base) {
return strtol(str, end, base);
}
};
struct StringToUnsignedIntTraits
: public StringToUnsignedIntegerTraits<unsigned int, unsigned long> {
static LongType Convert(const char* str, char** end, int base) {
if (str[0] == '-') {
return 0;
}
return strtoul(str, end, base);
}
};
template <typename Traits>
bool StringToIntegerInternal(const base::StringPiece& string,
typename Traits::IntType* number) {
typedef typename Traits::IntType IntType;
typedef typename Traits::LongType LongType;
Traits::TypeCheck();
if (string.empty() || isspace(string[0])) {
return false;
}
if (string[string.length()] != '\0') {
// The implementations use the C standard library’s conversion routines,
// which rely on the strings having a trailing NUL character. std::string
// will NUL-terminate.
std::string terminated_string(string.data(), string.length());
return StringToIntegerInternal<Traits>(terminated_string, number);
}
errno = 0;
char* end;
LongType result = Traits::Convert(string.data(), &end, 0);
if (Traits::IsNegativeOverflow(result) ||
result > std::numeric_limits<IntType>::max() ||
errno == ERANGE ||
end != string.data() + string.length()) {
return false;
}
*number = result;
return true;
}
} // namespace
namespace crashpad {
bool StringToNumber(const base::StringPiece& string, int* number) {
return StringToIntegerInternal<StringToIntTraits>(string, number);
}
bool StringToNumber(const base::StringPiece& string, unsigned int* number) {
return StringToIntegerInternal<StringToUnsignedIntTraits>(string, number);
}
} // namespace crashpad

63
util/stdlib/string_number_conversion.h Normal file
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// Copyright 2014 The Crashpad Authors. All rights reserved.
//
// 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.
#ifndef CRASHPAD_UTIL_STDLIB_STRING_NUMBER_CONVERSION_H_
#define CRASHPAD_UTIL_STDLIB_STRING_NUMBER_CONVERSION_H_
#include "base/strings/string_piece.h"
namespace crashpad {
// Convert between strings and numbers.
//
// These functions will only set *number if a perfect conversion can be
// performed. A perfect conversion contains no leading or trailing characters
// (including whitespace) other than the number to convert, and does not
// overflow the targeted data type. If a perfect conversion is possible, *number
// is set and these functions return true. Otherwise, they return false.
//
// The interface in base/strings/string_number_conversions.h doesn’t allow
// arbitrary bases based on whether the string begins with prefixes such as "0x"
// as strtol does with base = 0. The functions here are implemented on the
// strtol family with base = 0, and thus do accept such input.
//! \{
//! \brief Convert a string to a number.
//!
//! A conversion will only be performed if it can be done perfectly: if \a
//! string contains no leading or trailing characters (including whitespace)
//! other than the number to convert, and does not overflow the targeted data
//! type.
//!
//! \param[in] string The string to convert to a number. As in `strtol()` with a
//! `base` parameter of `0`, the string is treated as decimal unless it
//! begins with a `"0x"` or `"0X"` prefix, in which case it is treated as
//! hexadecimal, or a `"0"` prefix, in which case it is treated as octal.
//! \param[out] number The converted number. This will only be set if a perfect
//! conversion can be performed.
//!
//! \return `true` if a perfect conversion could be performed, with \a number
//! set appropriately. `false` if a perfect conversion was not possible.
//!
//! \note The interface in `base/strings/string_number_conversions.h` doesn’t
//! allow arbitrary bases based on whether the string begins with a prefix
//! indicating its base. The functions here are provided for situations
//! where such prefix recognition is desirable.
bool StringToNumber(const base::StringPiece& string, int* number);
bool StringToNumber(const base::StringPiece& string, unsigned int* number);
//! \}
} // namespace crashpad
#endif // CRASHPAD_UTIL_STDLIB_STRING_NUMBER_CONVERSION_H_

218
util/stdlib/string_number_conversion_test.cc Normal file
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// Copyright 2014 The Crashpad Authors. All rights reserved.
//
// 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 "util/stdlib/string_number_conversion.h"
#include "base/basictypes.h"
#include "gtest/gtest.h"
#include <limits>
namespace {
using namespace crashpad;
TEST(StringNumberConversion, StringToInt) {
const struct {
const char* string;
bool valid;
int value;
} kTestData[] = {
{"", false, 0},
{"0", true, 0},
{"1", true, 1},
{"2147483647", true, std::numeric_limits<int>::max()},
{"2147483648", false, 0},
{"4294967295", false, 0},
{"4294967296", false, 0},
{"-1", true, -1},
{"-2147483648", true, std::numeric_limits<int>::min()},
{"-2147483649", false, 0},
{"00", true, 0},
{"01", true, 1},
{"-01", true, -1},
{"+2", true, 2},
{"0x10", true, 16},
{"-0x10", true, -16},
{"+0x20", true, 32},
{"0xf", true, 15},
{"0xg", false, 0},
{"0x7fffffff", true, std::numeric_limits<int>::max()},
{"0x7FfFfFfF", true, std::numeric_limits<int>::max()},
{"0x80000000", false, 0},
{"0xFFFFFFFF", false, 0},
{"-0x7fffffff", true, -2147483647},
{"-0x80000000", true, -2147483648},
{"-0x80000001", false, 0},
{"-0xffffffff", false, 0},
{"0x100000000", false, 0},
{"0xabcdef", true, 11259375},
{"010", true, 8},
{"-010", true, -8},
{"+020", true, 16},
{"07", true, 7},
{"08", false, 0},
{" 0", false, 0},
{"0 ", false, 0},
{" 0 ", false, 0},
{" 1", false, 0},
{"1 ", false, 0},
{" 1 ", false, 0},
{"a2", false, 0},
{"2a", false, 0},
{"2a2", false, 0},
{".0", false, 0},
{".1", false, 0},
{"-.2", false, 0},
{"+.3", false, 0},
{"1.23", false, 0},
{"-273.15", false, 0},
{"+98.6", false, 0},
{"1e1", false, 0},
{"1E1", false, 0},
{"0x123p4", false, 0},
{"infinity", false, 0},
{"NaN", false, 0},
{"-9223372036854775810", false, 0},
{"-9223372036854775809", false, 0},
{"9223372036854775808", false, 0},
{"9223372036854775809", false, 0},
{"18446744073709551615", false, 0},
{"18446744073709551616", false, 0},
};
for (size_t index = 0; index < arraysize(kTestData); ++index) {
int value;
bool valid = StringToNumber(kTestData[index].string, &value);
if (kTestData[index].valid) {
EXPECT_TRUE(valid) << "index " << index << ", string "
<< kTestData[index].string;
if (valid) {
EXPECT_EQ(kTestData[index].value, value)
<< "index " << index << ", string " << kTestData[index].string;
}
} else {
EXPECT_FALSE(valid) << "index " << index << ", string "
<< kTestData[index].string << ", value " << value;
}
}
// Ensure that embedded NUL characters are treated as bad input.
const char input[] = "6\0006";
base::StringPiece input_string(input, arraysize(input) - 1);
int output;
EXPECT_FALSE(StringToNumber(input_string, &output));
// Ensure that a NUL is not required at the end of the string.
EXPECT_TRUE(StringToNumber(base::StringPiece("66", 1), &output));
EXPECT_EQ(6, output);
}
TEST(StringNumberConversion, StringToUnsignedInt) {
const struct {
const char* string;
bool valid;
unsigned int value;
} kTestData[] = {
{"", false, 0},
{"0", true, 0},
{"1", true, 1},
{"2147483647", true, 2147483647},
{"2147483648", true, 2147483648},
{"4294967295", true, std::numeric_limits<unsigned int>::max()},
{"4294967296", false, 0},
{"-1", false, 0},
{"-2147483648", false, 0},
{"-2147483649", false, 0},
{"00", true, 0},
{"01", true, 1},
{"-01", false, 0},
{"+2", true, 2},
{"0x10", true, 16},
{"-0x10", false, 0},
{"+0x20", true, 32},
{"0xf", true, 15},
{"0xg", false, 0},
{"0x7fffffff", true, 0x7fffffff},
{"0x7FfFfFfF", true, 0x7fffffff},
{"0x80000000", true, 0x80000000},
{"0xFFFFFFFF", true, 0xffffffff},
{"-0x7fffffff", false, 0},
{"-0x80000000", false, 0},
{"-0x80000001", false, 0},
{"-0xffffffff", false, 0},
{"0x100000000", false, 0},
{"0xabcdef", true, 11259375},
{"010", true, 8},
{"-010", false, 0},
{"+020", true, 16},
{"07", true, 7},
{"08", false, 0},
{" 0", false, 0},
{"0 ", false, 0},
{" 0 ", false, 0},
{" 1", false, 0},
{"1 ", false, 0},
{" 1 ", false, 0},
{"a2", false, 0},
{"2a", false, 0},
{"2a2", false, 0},
{".0", false, 0},
{".1", false, 0},
{"-.2", false, 0},
{"+.3", false, 0},
{"1.23", false, 0},
{"-273.15", false, 0},
{"+98.6", false, 0},
{"1e1", false, 0},
{"1E1", false, 0},
{"0x123p4", false, 0},
{"infinity", false, 0},
{"NaN", false, 0},
{"-9223372036854775810", false, 0},
{"-9223372036854775809", false, 0},
{"9223372036854775808", false, 0},
{"9223372036854775809", false, 0},
{"18446744073709551615", false, 0},
{"18446744073709551616", false, 0},
};
for (size_t index = 0; index < arraysize(kTestData); ++index) {
unsigned int value;
bool valid = StringToNumber(kTestData[index].string, &value);
if (kTestData[index].valid) {
EXPECT_TRUE(valid) << "index " << index << ", string "
<< kTestData[index].string;
if (valid) {
EXPECT_EQ(kTestData[index].value, value)
<< "index " << index << ", string " << kTestData[index].string;
}
} else {
EXPECT_FALSE(valid) << "index " << index << ", string "
<< kTestData[index].string << ", value " << value;
}
}
// Ensure that embedded NUL characters are treated as bad input.
const char input[] = "6\0006";
base::StringPiece input_string(input, arraysize(input) - 1);
unsigned int output;
EXPECT_FALSE(StringToNumber(input_string, &output));
// Ensure that a NUL is not required at the end of the string.
EXPECT_TRUE(StringToNumber(base::StringPiece("66", 1), &output));
EXPECT_EQ(6u, output);
}
} // namespace

3
util/util.gyp
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@ -80,6 +80,8 @@
'stdlib/cxx.h',
'stdlib/objc.h',
'stdlib/pointer_container.h',
'stdlib/string_number_conversion.cc',
'stdlib/string_number_conversion.h',
'stdlib/strlcpy.cc',
'stdlib/strlcpy.h',
'stdlib/strnlen.cc',
@ -192,6 +194,7 @@
'numeric/checked_range_test.cc',
'numeric/in_range_cast_test.cc',
'posix/process_util_test.cc',
'stdlib/string_number_conversion_test.cc',
'stdlib/strlcpy_test.cc',
'stdlib/strnlen_test.cc',
'test/executable_path_test.cc',