EST_strcasecmp.c

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/*
 * Copyright (c) 1987, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Modified by RJC to have a new name and to take the collation
 * table as an optional argument.
 */

#include "EST_strcasecmp.h"

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strcasecmp.c    8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */


/*
 * This array is designed for mapping upper and lower case letter
 * together for a case independent comparison.  The mappings are
 * based upon ascii character sequences.
 */
static const unsigned char def_charmap[] = {
    0,   1,   2,   3,   4,   5,   6,   7,
    8,   9,  10,  11,  12,  13,  14,  15,
   16,  17,  18,  19,  20,  21,  22,  23,
   24,  25,  26,  27,  28,  29,  30,  31,
   32,  33,  34,  35,  36,  37,  38,  39,
   40,  41,  42,  43,  44,  45,  46,  47,
   48,  49,  50,  51,  52,  53,  54,  55,
   56,  57,  58,  59,  60,  61,  62,  63,
   64,  97,  98,  99, 100, 101, 102, 103,
  104, 105, 106, 107, 108, 109, 110, 111,
  112, 113, 114, 115, 116, 117, 118, 119,
  120, 121, 122,  91,  92,  93,  94,  95,
   96,  97,  98,  99, 100, 101, 102, 103,
  104, 105, 106, 107, 108, 109, 110, 111,
  112, 113, 114, 115, 116, 117, 118, 119,
  120, 121, 122, 123, 124, 125, 126, 127,
  128, 129, 130, 131, 132, 133, 134, 135,
  136, 137, 138, 139, 140, 141, 142, 143,
  144, 145, 146, 147, 148, 149, 150, 151,
  152, 153, 154, 155, 156, 157, 158, 159,
  160, 161, 162, 163, 164, 165, 166, 167,
  168, 169, 170, 171, 172, 173, 174, 175,
  176, 177, 178, 179, 180, 181, 182, 183,
  184, 185, 186, 187, 188, 189, 190, 191,
  192, 193, 194, 195, 196, 197, 198, 199,
  200, 201, 202, 203, 204, 205, 206, 207,
  208, 209, 210, 211, 212, 213, 214, 215,
  216, 217, 218, 219, 220, 221, 222, 223,
  224, 225, 226, 227, 228, 229, 230, 231,
  232, 233, 234, 235, 236, 237, 238, 239,
  240, 241, 242, 243, 244, 245, 246, 247,
  248, 249, 250, 251, 252, 253, 254, 255,
};

int
EST_strcasecmp(const char *s1, const char *s2, const unsigned char *charmap)
{
    register const unsigned char *cm = charmap?charmap:def_charmap,
            *us1 = (const unsigned char *)s1,
            *us2 = (const unsigned char *)s2;
    int r;

    while (cm[*us1] == cm[*us2++])
        if (*us1++ == '\0')
            return (0);
    r = (cm[*us1] - cm[*--us2]); 
    return r;
}

int
EST_strncasecmp(const char *s1, const char *s2, size_t n, const unsigned char *charmap)
{
    if (n != 0) {
        register const unsigned char *cm = charmap?charmap:def_charmap,
                *us1 = (const unsigned char *)s1,
                *us2 = (const unsigned char *)s2;

        do {
            if (cm[*us1] != cm[*us2++])
                return (cm[*us1] - cm[*--us2]);
            if (*us1++ == '\0')
                break;
        } while (--n != 0);
    }
    return (0);
}