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Annotation of 43BSDReno/lib/libc/string/memcmp.c, revision 1.1.1.1

1.1       root        1: /*-
                      2:  * Copyright (c) 1990 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * Chris Torek.
                      7:  *
                      8:  * Redistribution and use in source and binary forms are permitted
                      9:  * provided that: (1) source distributions retain this entire copyright
                     10:  * notice and comment, and (2) distributions including binaries display
                     11:  * the following acknowledgement:  ``This product includes software
                     12:  * developed by the University of California, Berkeley and its contributors''
                     13:  * in the documentation or other materials provided with the distribution
                     14:  * and in all advertising materials mentioning features or use of this
                     15:  * software. Neither the name of the University nor the names of its
                     16:  * contributors may be used to endorse or promote products derived
                     17:  * from this software without specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #if defined(LIBC_SCCS) && !defined(lint)
                     24: static char sccsid[] = "@(#)memcmp.c   5.5 (Berkeley) 5/15/90";
                     25: #endif /* LIBC_SCCS and not lint */
                     26: 
                     27: #include <string.h>
                     28: #include <sys/stdc.h>
                     29: 
                     30: /*
                     31:  * Compare memory regions.
                     32:  */
                     33: int
                     34: memcmp(s1, s2, n)
                     35:        const void *s1, *s2;
                     36:        size_t n;
                     37: {
                     38:        if (n != 0) {
                     39:                register const unsigned char *p1 = s1, *p2 = s2;
                     40: 
                     41:                do {
                     42:                        if (*p1++ != *p2++)
                     43:                                return (*--p1 - *--p2);
                     44:                } while (--n != 0);
                     45:        }
                     46:        return (0);
                     47: }

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