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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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memicmp.c
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C/C++ Source or Header
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1998-06-17
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/***
*memicmp.c - compare memory, ignore case
*
* Copyright (c) 1988-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines _memicmp() - compare two blocks of memory for lexical
* order. Case is ignored in the comparison.
*
*******************************************************************************/
#include <cruntime.h>
#include <string.h>
#ifdef _WIN32
#include <mtdll.h>
#include <ctype.h>
#include <setlocal.h>
#include <locale.h>
#endif /* _WIN32 */
#define _TOLOWER(c) ( ((c) >= 'A') && ((c) <= 'Z') ? ((c) - 'A' + 'a') :\
(c) )
/***
*int _memicmp(first, last, count) - compare two blocks of memory, ignore case
*
*Purpose:
* Compares count bytes of the two blocks of memory stored at first
* and last. The characters are converted to lowercase before
* comparing (not permanently), so case is ignored in the search.
*
*Entry:
* char *first, *last - memory buffers to compare
* unsigned count - maximum length to compare
*
*Exit:
* returns < 0 if first < last
* returns 0 if first == last
* returns > 0 if first > last
*
*Uses:
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _memicmp (
const void * first,
const void * last,
unsigned int count
)
{
int f = 0;
int l = 0;
#ifdef _MT
int local_lock_flag;
#endif /* _MT */
#if defined (_WIN32)
if ( __lc_handle[LC_CTYPE] == _CLOCALEHANDLE ) {
#endif /* defined (_WIN32) */
while ( count-- )
{
if ( (*(unsigned char *)first == *(unsigned char *)last) ||
((f = _TOLOWER( *(unsigned char *)first )) ==
(l = _TOLOWER( *(unsigned char *)last ))) )
{
first = (char *)first + 1;
last = (char *)last + 1;
}
else
break;
}
#if defined (_WIN32)
}
else {
_lock_locale( local_lock_flag )
while ( count-- )
if ( (*(unsigned char *)first == *(unsigned char *)last) ||
((f = _tolower_lk( *(unsigned char *)first )) ==
(l = _tolower_lk( *(unsigned char *)last ))) )
{
first = (char *)first + 1;
last = (char *)last + 1;
}
else
break;
_unlock_locale( local_lock_flag )
}
#endif /* defined (_WIN32) */
return ( f - l );
}