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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. */
{
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;
}
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