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/*

 * memcmp.c --

 *

 *      Source code for the "memcmp" library routine.

 *

 * Copyright (c) 1998 Sun Microsystems, Inc.

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 * SCCS: @(#) memcmp.c 1.2 98/01/19 10:48:58

 */

#include "tcl.h"

#include "tclPort.h"

/*

 * Here is the prototype just in case it is not included

 * in tclPort.h.

 */

int             memcmp _ANSI_ARGS_((CONST VOID *s1,

                            CONST VOID *s2, size_t n));

/*

 *----------------------------------------------------------------------

 *

 * memcmp --

 *

 *      Compares two bytes sequences.

 *

 * Results:

 *     compares  its  arguments, looking at the first n

 *     bytes (each interpreted as an unsigned char), and  returns

 *     an integer less than, equal to, or greater than 0, accord-

 *     ing as s1 is less  than,  equal  to,  or

 *     greater than s2 when taken to be unsigned 8 bit numbers.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

int

memcmp(s1, s2, n)

    CONST VOID *s1;                     /* First string. */

    CONST VOID *s2;                     /* Second string. */

    size_t      n;                      /* Length to compare. */

{

    unsigned char u1, u2;

    for ( ; n-- ; s1++, s2++) {

        u1 = * (unsigned char *) s1;

        u2 = * (unsigned char *) s2;

        if ( u1 != u2) {

            return (u1-u2);

        }

    }

    return 0;

}