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* Sync with the 202601-stable Gnulib code (4a3650d887) * Ignore more deps stuff in gnulib * Remove autogenerated gnulib files * Ignore more gnulib generated headers
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* Case-insensitive string comparison function for unibyte locales.
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Copyright (C) 1998-1999, 2005-2007, 2009-2026 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <strings.h>
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#include <ctype.h>
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#include <limits.h>
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/* Compare no more than N bytes of strings S1 and S2, ignoring case,
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returning less than, equal to or greater than zero if S1 is
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lexicographically less than, equal to or greater than S2.
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Note: This function cannot work correctly in multibyte locales. */
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int
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strncasecmp (const char *s1, const char *s2, size_t n)
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{
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register const unsigned char *p1 = (const unsigned char *) s1;
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register const unsigned char *p2 = (const unsigned char *) s2;
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if (p1 == p2 || n == 0)
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return 0;
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for (;; p1++, p2++)
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{
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unsigned char c1 = tolower (*p1);
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unsigned char c2 = tolower (*p2);
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if (--n == 0 || c1 == '\0' || c1 != c2)
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{
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if (UCHAR_MAX <= INT_MAX)
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return c1 - c2;
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else
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/* On machines where 'char' and 'int' are types of the same size,
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the difference of two 'unsigned char' values - including the
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sign bit - doesn't fit in an 'int'. */
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return _GL_CMP (c1, c2);
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}
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}
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}
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