Line data Source code
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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 736082 : 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 736082 : from_chars_result answer{};
72 :
73 736082 : while (first != last) {
74 736082 : if (*first == ' ') {
75 0 : ++first;
76 : } else {
77 736082 : break;
78 : }
79 : }
80 736082 : 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 736082 : auto const result = std::from_chars(first, last, value);
88 736082 : answer.ptr = result.ptr;
89 736082 : answer.ec = result.ec;
90 736082 : return answer;
91 : #else
92 : errno = 0;
93 : char *pEnd;
94 : auto const ret_val = std::strtol(first, &pEnd, 10);
95 :
96 : if (errno == ERANGE) {
97 : errno = 0;
98 : answer.ec = std::errc::result_out_of_range;
99 : answer.ptr = pEnd;
100 : return answer;
101 : }
102 : if (pEnd == first) {
103 : answer.ec = std::errc::invalid_argument;
104 : answer.ptr = pEnd;
105 : return answer;
106 : }
107 : if constexpr (std::is_same_v<T, int>) {
108 : if (ret_val > std::numeric_limits<int>::max()) {
109 : answer.ec = std::errc::result_out_of_range;
110 : answer.ptr = pEnd;
111 : value = 0;
112 : return answer;
113 : }
114 : }
115 :
116 : answer.ptr = pEnd;
117 : answer.ec = std::errc();
118 : value = ret_val;
119 : return answer;
120 : #endif
121 : }
122 :
123 : } // namespace FromChars
124 :
125 : #endif // FromChars_hh_INCLUDED
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