1 //===------------------------- charconv.cpp -------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
13 _LIBCPP_BEGIN_NAMESPACE_STD
18 static constexpr char cDigitsLut[200] = {
19 '0', '0', '0', '1', '0', '2', '0', '3', '0', '4', '0', '5', '0', '6', '0',
20 '7', '0', '8', '0', '9', '1', '0', '1', '1', '1', '2', '1', '3', '1', '4',
21 '1', '5', '1', '6', '1', '7', '1', '8', '1', '9', '2', '0', '2', '1', '2',
22 '2', '2', '3', '2', '4', '2', '5', '2', '6', '2', '7', '2', '8', '2', '9',
23 '3', '0', '3', '1', '3', '2', '3', '3', '3', '4', '3', '5', '3', '6', '3',
24 '7', '3', '8', '3', '9', '4', '0', '4', '1', '4', '2', '4', '3', '4', '4',
25 '4', '5', '4', '6', '4', '7', '4', '8', '4', '9', '5', '0', '5', '1', '5',
26 '2', '5', '3', '5', '4', '5', '5', '5', '6', '5', '7', '5', '8', '5', '9',
27 '6', '0', '6', '1', '6', '2', '6', '3', '6', '4', '6', '5', '6', '6', '6',
28 '7', '6', '8', '6', '9', '7', '0', '7', '1', '7', '2', '7', '3', '7', '4',
29 '7', '5', '7', '6', '7', '7', '7', '8', '7', '9', '8', '0', '8', '1', '8',
30 '2', '8', '3', '8', '4', '8', '5', '8', '6', '8', '7', '8', '8', '8', '9',
31 '9', '0', '9', '1', '9', '2', '9', '3', '9', '4', '9', '5', '9', '6', '9',
32 '7', '9', '8', '9', '9'};
35 inline _LIBCPP_INLINE_VISIBILITY char*
36 append1(char* buffer, T i)
38 *buffer = '0' + static_cast<char>(i);
43 inline _LIBCPP_INLINE_VISIBILITY char*
44 append2(char* buffer, T i)
46 memcpy(buffer, &cDigitsLut[(i)*2], 2);
51 inline _LIBCPP_INLINE_VISIBILITY char*
52 append3(char* buffer, T i)
54 return append2(append1(buffer, (i) / 100), (i) % 100);
58 inline _LIBCPP_INLINE_VISIBILITY char*
59 append4(char* buffer, T i)
61 return append2(append2(buffer, (i) / 100), (i) % 100);
65 __u32toa(uint32_t value, char* buffer)
72 buffer = append1(buffer, value);
74 buffer = append2(buffer, value);
79 buffer = append3(buffer, value);
81 buffer = append4(buffer, value);
84 else if (value < 100000000)
87 const uint32_t b = value / 10000;
88 const uint32_t c = value % 10000;
93 buffer = append1(buffer, b);
95 buffer = append2(buffer, b);
100 buffer = append3(buffer, b);
102 buffer = append4(buffer, b);
105 buffer = append4(buffer, c);
109 // value = aabbbbcccc in decimal
110 const uint32_t a = value / 100000000; // 1 to 42
114 buffer = append1(buffer, a);
116 buffer = append2(buffer, a);
118 buffer = append4(buffer, value / 10000);
119 buffer = append4(buffer, value % 10000);
126 __u64toa(uint64_t value, char* buffer)
128 if (value < 100000000)
130 uint32_t v = static_cast<uint32_t>(value);
136 buffer = append1(buffer, v);
138 buffer = append2(buffer, v);
143 buffer = append3(buffer, v);
145 buffer = append4(buffer, v);
151 const uint32_t b = v / 10000;
152 const uint32_t c = v % 10000;
157 buffer = append1(buffer, b);
159 buffer = append2(buffer, b);
164 buffer = append3(buffer, b);
166 buffer = append4(buffer, b);
169 buffer = append4(buffer, c);
172 else if (value < 10000000000000000)
174 const uint32_t v0 = static_cast<uint32_t>(value / 100000000);
175 const uint32_t v1 = static_cast<uint32_t>(value % 100000000);
177 const uint32_t b0 = v0 / 10000;
178 const uint32_t c0 = v0 % 10000;
183 buffer = append1(buffer, b0);
185 buffer = append2(buffer, b0);
190 buffer = append3(buffer, b0);
192 buffer = append4(buffer, b0);
195 buffer = append4(buffer, c0);
196 buffer = append4(buffer, v1 / 10000);
197 buffer = append4(buffer, v1 % 10000);
202 static_cast<uint32_t>(value / 10000000000000000); // 1 to 1844
203 value %= 10000000000000000;
208 buffer = append1(buffer, a);
210 buffer = append2(buffer, a);
215 buffer = append3(buffer, a);
217 buffer = append4(buffer, a);
220 const uint32_t v0 = static_cast<uint32_t>(value / 100000000);
221 const uint32_t v1 = static_cast<uint32_t>(value % 100000000);
222 buffer = append4(buffer, v0 / 10000);
223 buffer = append4(buffer, v0 % 10000);
224 buffer = append4(buffer, v1 / 10000);
225 buffer = append4(buffer, v1 % 10000);
231 } // namespace __itoa
233 _LIBCPP_END_NAMESPACE_STD