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111 lines
3.4 KiB
111 lines
3.4 KiB
/***
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*memicmp.c - compare memory, ignore case
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*
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* Copyright (c) 1988-1995, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _memicmp() - compare two blocks of memory for lexical
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* order. Case is ignored in the comparison.
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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. Also, fixed compiler warnings.
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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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* 01-17-91 GJF ANSI naming.
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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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* 10-18-94 GJF Sped up, especially for C locale. Also, made multi-
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* thread safe.
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* 12-29-94 CFW Merge non-Win32.
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* 09-26-95 GJF New locking macro, and scheme, for functions which
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* reference the locale.
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* 11-15-95 BWT Fix _NTSUBSET_
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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 _WIN32
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#include <mtdll.h>
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#include <ctype.h>
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#include <setlocal.h>
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#include <locale.h>
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#endif /* _WIN32 */
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#define _TOLOWER(c) ( ((c) >= 'A') && ((c) <= 'Z') ? ((c) - 'A' + 'a') :\
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(c) )
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/***
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*int _memicmp(first, last, count) - compare two blocks of memory, ignore case
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*
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*Purpose:
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* Compares count bytes of the two blocks of memory stored at first
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* and last. The characters are converted to lowercase before
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* comparing (not permanently), so case is ignored in the search.
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*
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*Entry:
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* char *first, *last - memory buffers to compare
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* unsigned count - maximum length to compare
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*
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*Exit:
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* returns < 0 if first < last
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* returns 0 if first == last
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* returns > 0 if first > last
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*
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*Uses:
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _memicmp (
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const void * first,
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const void * last,
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unsigned int count
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)
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{
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int f = 0;
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int l = 0;
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#ifdef _MT
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int local_lock_flag;
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#endif
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#if defined(_WIN32) && !defined(_NTSUBSET_)
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if ( __lc_handle[LC_CTYPE] == _CLOCALEHANDLE ) {
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#endif /* _WIN32 */
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while ( count-- )
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{
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if ( (*(unsigned char *)first == *(unsigned char *)last) ||
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((f = _TOLOWER( *(unsigned char *)first )) ==
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(l = _TOLOWER( *(unsigned char *)last ))) )
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{
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first = (char *)first + 1;
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last = (char *)last + 1;
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}
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else
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break;
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}
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#if defined(_WIN32) && !defined(_NTSUBSET_)
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}
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else {
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_lock_locale( local_lock_flag )
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while ( count-- )
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if ( (*(unsigned char *)first == *(unsigned char *)last) ||
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((f = _tolower_lk( *(unsigned char *)first )) ==
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(l = _tolower_lk( *(unsigned char *)last ))) )
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{
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first = (char *)first + 1;
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last = (char *)last + 1;
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}
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else
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break;
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_unlock_locale( local_lock_flag )
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}
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#endif /* _WIN32 */
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return ( f - l );
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}
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