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91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef STRING_FUNC_EXTRA_H
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#define STRING_FUNC_EXTRA_H
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#include "string_func.h"
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#include <string>
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#include <limits>
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inline void StrMakeValidInPlace(std::string &str, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK)
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{
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if (str.empty()) return;
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char *buf = str.data();
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str.resize(StrMakeValidInPlace(buf, buf + str.size(), settings) - buf);
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}
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template <typename F>
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inline void ProcessLineByLine(char *buf, F line_functor)
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{
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char *p = buf;
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char *p2 = buf;
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/* Print output line by line */
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for (; *p2 != '\0'; p2++) {
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if (*p2 == '\n') {
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*p2 = '\0';
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line_functor(p);
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p = p2 + 1;
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}
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}
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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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if (std::is_signed<T>::value) {
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable: 4146)
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#endif
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value = negative ? -out : out;
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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} else {
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value = out;
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}
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return true;
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}
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#endif /* STRING_FUNC_EXTRA_H */
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