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/*
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* memcmp.c --
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*
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* Source code for the "memcmp" library routine.
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*
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* Copyright (c) 1998 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) memcmp.c 1.2 98/01/19 10:48:58
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*/
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#include "tcl.h"
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#include "tclPort.h"
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/*
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* Here is the prototype just in case it is not included
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* in tclPort.h.
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*/
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int memcmp _ANSI_ARGS_((CONST VOID *s1,
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CONST VOID *s2, size_t n));
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/*
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*----------------------------------------------------------------------
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*
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* memcmp --
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*
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* Compares two bytes sequences.
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*
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* Results:
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* compares its arguments, looking at the first n
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* bytes (each interpreted as an unsigned char), and returns
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* an integer less than, equal to, or greater than 0, accord-
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* ing as s1 is less than, equal to, or
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* greater than s2 when taken to be unsigned 8 bit numbers.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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memcmp(s1, s2, n)
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CONST VOID *s1; /* First string. */
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CONST VOID *s2; /* Second string. */
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size_t n; /* Length to compare. */
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{
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CONST unsigned char *ptr1 = (CONST unsigned char *) s1;
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CONST unsigned char *ptr2 = (CONST unsigned char *) s2;
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for ( ; n-- ; ptr1++, ptr2++) {
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unsigned char u1 = *s1, u2 = *s2;
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if ( u1 != u2) {
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return (u1-u2);
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}
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}
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return 0;
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}
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