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// Tencent is pleased to support the open source community by making RapidJSON available.
//
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
//
// Licensed under the MIT License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// http://opensource.org/licenses/MIT
//
// 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 "unittest.h"
#include "rapidjson/internal/itoa.h"
#ifdef __GNUC__
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(type-limits)
#endif
using namespace rapidjson::internal;
template <typename T>
struct Traits {
};
template <>
struct Traits<uint32_t> {
enum { kBufferSize = 11 };
enum { kMaxDigit = 10 };
static uint32_t Negate(uint32_t x) { return x; }
};
template <>
struct Traits<int32_t> {
enum { kBufferSize = 12 };
enum { kMaxDigit = 10 };
static int32_t Negate(int32_t x) { return -x; }
};
template <>
struct Traits<uint64_t> {
enum { kBufferSize = 21 };
enum { kMaxDigit = 20 };
static uint64_t Negate(uint64_t x) { return x; }
};
template <>
struct Traits<int64_t> {
enum { kBufferSize = 22 };
enum { kMaxDigit = 20 };
static int64_t Negate(int64_t x) { return -x; }
};
template <typename T>
static void VerifyValue(T value, void(*f)(T, char*), char* (*g)(T, char*)) {
char buffer1[Traits<T>::kBufferSize];
char buffer2[Traits<T>::kBufferSize];
f(value, buffer1);
*g(value, buffer2) = '\0';
EXPECT_STREQ(buffer1, buffer2);
}
template <typename T>
static void Verify(void(*f)(T, char*), char* (*g)(T, char*)) {
// Boundary cases
VerifyValue<T>(0, f, g);
VerifyValue<T>((std::numeric_limits<T>::min)(), f, g);
VerifyValue<T>((std::numeric_limits<T>::max)(), f, g);
// 2^n - 1, 2^n, 10^n - 1, 10^n until overflow
for (int power = 2; power <= 10; power += 8) {
T i = 1, last;
do {
VerifyValue<T>(i - 1, f, g);
VerifyValue<T>(i, f, g);
if ((std::numeric_limits<T>::min)() < 0) {
VerifyValue<T>(Traits<T>::Negate(i), f, g);
VerifyValue<T>(Traits<T>::Negate(i + 1), f, g);
}
last = i;
if (i > static_cast<T>((std::numeric_limits<T>::max)() / static_cast<T>(power)))
break;
i *= static_cast<T>(power);
} while (last < i);
}
}
static void u32toa_naive(uint32_t value, char* buffer) {
char temp[10];
char *p = temp;
do {
*p++ = static_cast<char>(char(value % 10) + '0');
value /= 10;
} while (value > 0);
do {
*buffer++ = *--p;
} while (p != temp);
*buffer = '\0';
}
static void i32toa_naive(int32_t value, char* buffer) {
uint32_t u = static_cast<uint32_t>(value);
if (value < 0) {
*buffer++ = '-';
u = ~u + 1;
}
u32toa_naive(u, buffer);
}
static void u64toa_naive(uint64_t value, char* buffer) {
char temp[20];
char *p = temp;
do {
*p++ = static_cast<char>(char(value % 10) + '0');
value /= 10;
} while (value > 0);
do {
*buffer++ = *--p;
} while (p != temp);
*buffer = '\0';
}
static void i64toa_naive(int64_t value, char* buffer) {
uint64_t u = static_cast<uint64_t>(value);
if (value < 0) {
*buffer++ = '-';
u = ~u + 1;
}
u64toa_naive(u, buffer);
}
TEST(itoa, u32toa) {
Verify(u32toa_naive, u32toa);
}
TEST(itoa, i32toa) {
Verify(i32toa_naive, i32toa);
}
TEST(itoa, u64toa) {
Verify(u64toa_naive, u64toa);
}
TEST(itoa, i64toa) {
Verify(i64toa_naive, i64toa);
}
#ifdef __GNUC__
RAPIDJSON_DIAG_POP
#endif
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