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@ -10,6 +10,7 @@
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#include "string_func.h"
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#include <string>
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#include <limits>
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static inline void StrMakeValidInPlace(std::string &str, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK)
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{
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@ -34,5 +35,45 @@ inline void ProcessLineByLine(char *buf, F line_functor)
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if (p < p2) line_functor(p);
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}
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/*
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* Cut down version of std::from_chars, base is fixed at 10.
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* Returns true on success
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*/
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template <typename T>
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inline bool IntFromChars(const char* first, const char* last, T& value)
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{
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static_assert(std::is_integral<T>::value && !std::is_same<T, bool>::value, "T must be an integer");
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bool negative = false;
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if (std::is_signed<T>::value) {
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if (first != last && *first == '-') {
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first++;
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negative = true;
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}
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}
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T out = 0;
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const char * const start = first;
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while (first != last) {
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const char c = *first;
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if (c >= '0' && c <= '9') {
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#ifdef WITH_OVERFLOW_BUILTINS
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if (unlikely(__builtin_mul_overflow(out, 10, &out))) return false;
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if (unlikely(__builtin_add_overflow(out, c - '0', &out))) return false;
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#else
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if (unlikely(out > std::numeric_limits<T>::max() / 10)) return false;
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out *= 10;
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if (unlikely(out > (std::numeric_limits<T>::max() - (c - '0')))) return false;
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out += (c - '0');
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#endif
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first++;
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} else {
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break;
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}
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}
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if (start == first) return false;
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value = negative ? -out : out;
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return true;
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}
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#endif /* STRING_FUNC_EXTRA_H */
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