65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
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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 of
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*/
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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 in tclPort.h.
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*/
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int memcmp(const void *s1, 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 bytes (each interpreted
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* as an unsigned char), and returns an integer less than, equal to, or
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* greater than 0, according as s1 is less than, equal to, or greater
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* 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(
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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 = *ptr1, u2 = *ptr2;
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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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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 4
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* fill-column: 78
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* End:
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*/
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