mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-12 19:34:40 +08:00
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* Case-insensitive buffer comparator.
|
|
Copyright (C) 1996, 1997, 2000, 2003 Free Software Foundation, Inc.
|
|
|
|
This program 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; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This program 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. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* Written by Jim Meyering. */
|
|
|
|
#if HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include <ctype.h>
|
|
|
|
#if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
|
|
# define IN_CTYPE_DOMAIN(Char) 1
|
|
#else
|
|
# define IN_CTYPE_DOMAIN(Char) isascii (Char)
|
|
#endif
|
|
#define ISLOWER(Char) (IN_CTYPE_DOMAIN (Char) && islower (Char))
|
|
|
|
#if _LIBC || STDC_HEADERS
|
|
# define TOUPPER(Char) toupper (Char)
|
|
#else
|
|
# define TOUPPER(Char) (ISLOWER (Char) ? toupper (Char) : (Char))
|
|
#endif
|
|
|
|
#include "memcasecmp.h"
|
|
|
|
/* Like memcmp, but ignore differences in case.
|
|
Convert to upper case (not lower) before comparing so that
|
|
join -i works with sort -f. */
|
|
|
|
int
|
|
memcasecmp (const void *vs1, const void *vs2, size_t n)
|
|
{
|
|
size_t i;
|
|
char const *s1 = vs1;
|
|
char const *s2 = vs2;
|
|
for (i = 0; i < n; i++)
|
|
{
|
|
unsigned char u1 = s1[i];
|
|
unsigned char u2 = s2[i];
|
|
int diff = TOUPPER (u1) - TOUPPER (u2);
|
|
if (diff)
|
|
return diff;
|
|
}
|
|
return 0;
|
|
}
|