55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/***
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*memcmp.c - compare two blocks of memory
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*
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* Copyright (c) 1985-1997, 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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*******************************************************************************/
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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 /* _MSC_VER */
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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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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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return( *((unsigned char *)buf1) - *((unsigned char *)buf2) );
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}
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