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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.
*
* RCS: @(#) $Id: memcmp.c,v 1.5 2008/04/27 22:21:27 dkf Exp $
*/
#include "tclPort.h"
/*
* Here is the prototype just in case it is not included in tclPort.h.
*/
int memcmp(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, according as s1 is less than, equal to, or greater
* than s2 when taken to be unsigned 8 bit numbers.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
memcmp(
const void *s1, /* First string. */
const void *s2, /* Second string. */
size_t n) /* Length to compare. */
{
const unsigned char *ptr1 = (const unsigned char *) s1;
const unsigned char *ptr2 = (const unsigned char *) s2;
for ( ; n-- ; ptr1++, ptr2++) {
unsigned char u1 = *ptr1, u2 = *ptr2;
if (u1 != u2) {
return (u1-u2);
}
}
return 0;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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