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Annotation of sys/lib/libkern/strncasecmp.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: strncasecmp.c,v 1.4 2004/08/07 00:38:33 deraadt Exp $ */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1994 Christian E. Hopps
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  * 3. All advertising materials mentioning features or use of this software
        !            16:  *    must display the following acknowledgement:
        !            17:  *      This product includes software developed by Christian E. Hopps.
        !            18:  * 4. The name of the author may not be used to endorse or promote products
        !            19:  *    derived from this software without specific prior written permission
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            22:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
        !            23:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
        !            24:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
        !            25:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
        !            26:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
        !            27:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
        !            28:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            29:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
        !            30:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            31:  */
        !            32: #if defined(LIBC_SCCS) && !defined(lint)
        !            33: static char *rcsid = "$Id: strncasecmp.c,v 1.4 2004/08/07 00:38:33 deraadt Exp $";
        !            34: #endif /* LIBC_SCCS and not lint */
        !            35:
        !            36: #if !defined(_KERNEL) && !defined(_STANDALONE)
        !            37: #include <string.h>
        !            38: #else
        !            39: #include <lib/libkern/libkern.h>
        !            40: #endif
        !            41:
        !            42: int
        !            43: strncasecmp(const char *s1, const char *s2, size_t n)
        !            44: {
        !            45:        if (n == 0)
        !            46:                return 0;
        !            47:
        !            48:        do {
        !            49:                unsigned char c1 = (unsigned char) *s1++;
        !            50:                unsigned char c2 = (unsigned char) *s2++;
        !            51:
        !            52:                if (c1 != c2) {
        !            53:                        if (c1 >= 'A' && c1 <= 'Z' &&
        !            54:                            c2 >= 'a' && c2 <= 'z')
        !            55:                                c1 += 'a' - 'A';
        !            56:                        else if (c1 >= 'a' && c1 <= 'z' &&
        !            57:                                 c2 >= 'A' && c2 <= 'Z')
        !            58:                                c2 += 'a' - 'A';
        !            59:                        if (c1 != c2)
        !            60:                                return c1 - c2;
        !            61:                }
        !            62:                if (c1 == 0)
        !            63:                        break;
        !            64:        } while (--n != 0);
        !            65:
        !            66:        return 0;
        !            67: }