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94 lines
2.2 KiB
94 lines
2.2 KiB
/***
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*memcmp.c - compare two blocks of memory
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines memcmp() - compare two memory blocks lexically and
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* find their order.
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*
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*Revision History:
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* 05-31-89 JCR C version created.
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* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
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* copyright.
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* 10-01-90 GJF New-style function declarator. Also, rewrote expr. to
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* avoid using cast as an lvalue.
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* 04-01-91 SRW Add #pragma function for i386 _WIN32_ and _CRUISER_
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* builds
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* 10-11-91 GJF Bug fix! Comparison of final bytes must use unsigned
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* chars.
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* 09-01-93 GJF Replaced _CALLTYPE1 with __cdecl.
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* 12-03-93 GJF Turn on #pragma function for all MS front-ends (esp.,
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* Alpha compiler).
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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#ifdef _MSC_VER
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#pragma function(memcmp)
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#endif
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/***
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*int memcmp(buf1, buf2, count) - compare memory for lexical order
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*
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*Purpose:
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* Compares count bytes of memory starting at buf1 and buf2
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* and find if equal or which one is first in lexical order.
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*
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*Entry:
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* void *buf1, *buf2 - pointers to memory sections to compare
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* size_t count - length of sections to compare
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*
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*Exit:
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* returns < 0 if buf1 < buf2
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* returns 0 if buf1 == buf2
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* returns > 0 if buf1 > buf2
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl memcmp (
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const void * buf1,
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const void * buf2,
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size_t count
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)
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{
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if (!count)
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return(0);
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#if defined(_M_AMD64)
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{
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#if !defined(LIBCNTPR)
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__declspec(dllimport)
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#endif
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size_t RtlCompareMemory( const void * src1, const void * src2, size_t length );
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size_t length;
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if ( ( length = RtlCompareMemory( buf1, buf2, count ) ) == count ) {
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return(0);
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}
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buf1 = (char *)buf1 + length;
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buf2 = (char *)buf2 + length;
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}
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#else
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while ( --count && *(char *)buf1 == *(char *)buf2 ) {
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buf1 = (char *)buf1 + 1;
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buf2 = (char *)buf2 + 1;
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}
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#endif
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return( *((unsigned char *)buf1) - *((unsigned char *)buf2) );
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}
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