78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* Copyright (C) 1996 by Andrey A. Chernov, Moscow, Russia.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: collcmp.c,v 1.5 1996/08/14 19:47:02 ache Exp $
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*/
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#include <ctype.h>
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#include <string.h>
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#include <limits.h>
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#include <locale.h>
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/*
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* Compare two characters converting collate information
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* into ASCII-compatible range, it allows to handle
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* "[a-z]"-type ranges with national characters.
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*/
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int collate_range_cmp (c1, c2)
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int c1, c2;
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{
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int as1, as2, al1, al2, ret;
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static char s1[2], s2[2];
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c1 &= UCHAR_MAX;
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c2 &= UCHAR_MAX;
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if (c1 == c2)
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return (0);
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as1 = isascii(c1);
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as2 = isascii(c2);
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al1 = isalpha(c1);
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al2 = isalpha(c2);
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if (as1 || as2 || al1 || al2) {
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if ((as1 && as2) || (!al1 && !al2))
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return (c1 - c2);
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if (al1 && !al2) {
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if (isupper(c1))
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return ('A' - c2);
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else
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return ('a' - c2);
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} else if (al2 && !al1) {
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if (isupper(c2))
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return (c1 - 'A');
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else
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return (c1 - 'a');
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}
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}
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s1[0] = c1;
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s2[0] = c2;
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if ((ret = strcoll(s1, s2)) != 0)
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return (ret);
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return (c1 - c2);
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}
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