56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
// stringutils.cpp
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//
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// Copyright (C) 2001-present, the Celestia Development Team
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// Original version by Chris Laurel <claurel@shatters.net>
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//
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// Miscellaneous useful functions.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#include <cctype>
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#include "stringutils.h"
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using namespace std;
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int compareIgnoringCase(std::string_view s1, std::string_view s2)
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{
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auto i1 = s1.begin();
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auto i2 = s2.begin();
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while (i1 != s1.end() && i2 != s2.end())
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{
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if (toupper(*i1) != toupper(*i2))
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return (toupper(*i1) < toupper(*i2)) ? -1 : 1;
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++i1;
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++i2;
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}
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return s2.size() - s1.size();
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}
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int compareIgnoringCase(std::string_view s1, std::string_view s2, int n)
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{
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auto i1 = s1.begin();
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auto i2 = s2.begin();
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while (i1 != s1.end() && i2 != s2.end() && n > 0)
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{
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if (toupper(*i1) != toupper(*i2))
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return (toupper(*i1) < toupper(*i2)) ? -1 : 1;
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++i1;
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++i2;
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n--;
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}
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return n > 0 ? s2.size() - s1.size() : 0;
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}
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bool CompareIgnoringCasePredicate::operator()(std::string_view s1,
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std::string_view s2) const
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{
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return compareIgnoringCase(s1, s2) < 0;
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}
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