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61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* Case-insensitive buffer comparator.
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Copyright (C) 1996, 1997, 2000, 2003 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by Jim Meyering. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <ctype.h>
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#if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
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# define IN_CTYPE_DOMAIN(Char) 1
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#else
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# define IN_CTYPE_DOMAIN(Char) isascii (Char)
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#endif
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#define ISLOWER(Char) (IN_CTYPE_DOMAIN (Char) && islower (Char))
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#if _LIBC || STDC_HEADERS
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# define TOUPPER(Char) toupper (Char)
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#else
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# define TOUPPER(Char) (ISLOWER (Char) ? toupper (Char) : (Char))
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#endif
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#include "memcasecmp.h"
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/* Like memcmp, but ignore differences in case.
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Convert to upper case (not lower) before comparing so that
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join -i works with sort -f. */
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int
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memcasecmp (const void *vs1, const void *vs2, size_t n)
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{
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size_t i;
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char const *s1 = vs1;
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char const *s2 = vs2;
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for (i = 0; i < n; i++)
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{
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unsigned char u1 = s1[i];
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unsigned char u2 = s2[i];
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int diff = TOUPPER (u1) - TOUPPER (u2);
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if (diff)
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return diff;
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}
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return 0;
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}
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