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[gnulib.git] / lib / wcsncasecmp-impl.h
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1 /* Compare two wide strings ignoring case.
2 Copyright (C) 1999, 2011-2024 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2011.
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation, either version 3 of the
8 License, or (at your option) any later version.
10 This file is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18 int
19 wcsncasecmp (const wchar_t *s1, const wchar_t *s2, size_t n)
21 for (; n > 0;)
23 wchar_t wc1 = towlower (*s1++);
24 wchar_t wc2 = towlower (*s2++);
25 if (wc1 != (wchar_t)'\0' && wc1 == wc2)
27 n--;
28 continue;
30 /* Note that wc1 and wc2 each have at most 31 bits. */
31 return (int)wc1 - (int)wc2;
32 /* > 0 if wc1 > wc2, < 0 if wc1 < wc2,
33 = 0 if wc1 and wc2 are both '\0'. */
35 return 0;