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Annotation of sys/lib/libkern/strncasecmp.c, Revision 1.1.1.1

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: }