Line data Source code
1 : // EnergyPlus, Copyright (c) 1996-2023, The Board of Trustees of the University of Illinois,
2 : // The Regents of the University of California, through Lawrence Berkeley National Laboratory
3 : // (subject to receipt of any required approvals from the U.S. Dept. of Energy), Oak Ridge
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25 : // used to endorse or promote products derived from this software without specific prior
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31 : // software as "EnergyPlus version X" software, where "X" is the version number Licensee
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47 :
48 : #ifndef FromChars_hh_INCLUDED
49 : #define FromChars_hh_INCLUDED
50 :
51 : #if __has_include(<charconv>)
52 : #include <charconv>
53 : #endif
54 : #include <cstdlib>
55 : #include <limits>
56 : #include <system_error>
57 :
58 : namespace FromChars {
59 :
60 : struct from_chars_result
61 : {
62 : const char *ptr;
63 : std::errc ec;
64 : };
65 :
66 : // GCC doesn't have <charconv> until 8.1 so we need to implement an equivalent shim until we move to >=8.1
67 3464595 : template <typename T> from_chars_result from_chars(const char *first, const char *last, T &value) noexcept
68 : {
69 : static_assert(std::is_same_v<T, int> || std::is_same_v<T, long int>, "only int and long int are currently supported");
70 :
71 3464595 : from_chars_result answer{};
72 :
73 3464595 : while (first != last) {
74 3464595 : if (*first == ' ') {
75 0 : ++first;
76 : } else {
77 3464595 : break;
78 : }
79 : }
80 3464595 : if (first == last) {
81 0 : answer.ec = std::errc::invalid_argument;
82 0 : answer.ptr = first;
83 0 : return answer;
84 : }
85 :
86 : #if __has_include(<charconv>)
87 : auto const result = std::from_chars(first, last, value);
88 : answer.ptr = result.ptr;
89 : answer.ec = result.ec;
90 : return answer;
91 : #else
92 3464595 : errno = 0;
93 : char *pEnd;
94 3464595 : auto const ret_val = std::strtol(first, &pEnd, 10);
95 :
96 3464595 : if (errno == ERANGE) {
97 0 : errno = 0;
98 0 : answer.ec = std::errc::result_out_of_range;
99 0 : answer.ptr = pEnd;
100 0 : return answer;
101 : }
102 3464595 : if (pEnd == first) {
103 2767 : answer.ec = std::errc::invalid_argument;
104 2767 : answer.ptr = pEnd;
105 2767 : return answer;
106 : }
107 : if constexpr (std::is_same_v<T, int>) {
108 3461828 : if (ret_val > std::numeric_limits<int>::max()) {
109 334 : answer.ec = std::errc::result_out_of_range;
110 334 : answer.ptr = pEnd;
111 334 : value = 0;
112 334 : return answer;
113 : }
114 : }
115 :
116 3461494 : answer.ptr = pEnd;
117 3461494 : answer.ec = std::errc();
118 3461494 : value = ret_val;
119 3461494 : return answer;
120 : #endif
121 : }
122 :
123 : } // namespace FromChars
124 :
125 : #endif // FromChars_hh_INCLUDED
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