1 /* 2 * Copyright (C) 1996 by Andrey A. Chernov, Moscow, Russia. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $Id: collcmp.c,v 1.5 1996/08/14 19:47:02 ache Exp $ 27 */ 28 29 #include <ctype.h> 30 #include <string.h> 31 #include <limits.h> 32 #include <locale.h> 33 34 /* 35 * Compare two characters converting collate information 36 * into ASCII-compatible range, it allows to handle 37 * "[a-z]"-type ranges with national characters. 38 */ 39 40 int collate_range_cmp (c1, c2) 41 int c1, c2; 42 { 43 int as1, as2, al1, al2, ret; 44 static char s1[2], s2[2]; 45 46 c1 &= UCHAR_MAX; 47 c2 &= UCHAR_MAX; 48 if (c1 == c2) 49 return (0); 50 51 as1 = isascii(c1); 52 as2 = isascii(c2); 53 al1 = isalpha(c1); 54 al2 = isalpha(c2); 55 56 if (as1 || as2 || al1 || al2) { 57 if ((as1 && as2) || (!al1 && !al2)) 58 return (c1 - c2); 59 if (al1 && !al2) { 60 if (isupper(c1)) 61 return ('A' - c2); 62 else 63 return ('a' - c2); 64 } else if (al2 && !al1) { 65 if (isupper(c2)) 66 return (c1 - 'A'); 67 else 68 return (c1 - 'a'); 69 } 70 } 71 72 s1[0] = c1; 73 s2[0] = c2; 74 if ((ret = strcoll(s1, s2)) != 0) 75 return (ret); 76 return (c1 - c2); 77 } 78