135 lines
4 KiB
C
135 lines
4 KiB
C
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/***
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*memicmp.c - compare memory, ignore case
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*
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* Copyright (c) 1988-2001, 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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* 08-27-98 GJF Revised multithread support based on threadlocinfo
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* struct.
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* 09-08-98 GJF Split out ASCII-only version.
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* 05-17-99 PML Remove all Macintosh support.
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* 10-27-99 PML Win64 fix: unsigned int -> size_t
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* 26-01-00 GB Modified memicmp for performance.
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* 09-03-00 GB Moved the performance code to toupper and tolower.
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* restored the original file.
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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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#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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/***
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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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* size_t 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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size_t count
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)
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{
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int f = 0, l = 0;
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const char *dst = first, *src = last;
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#if !defined(_NTSUBSET_)
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#ifdef _MT
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pthreadlocinfo ptloci = _getptd()->ptlocinfo;
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if ( ptloci != __ptlocinfo )
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ptloci = __updatetlocinfo();
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if ( ptloci->lc_handle[LC_CTYPE] == _CLOCALEHANDLE )
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#else
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if ( __lc_handle[LC_CTYPE] == _CLOCALEHANDLE )
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#endif
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{
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#endif /* !_NTSUBSET_ */
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return __ascii_memicmp(first, last, count);
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#if !defined(_NTSUBSET_)
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}
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else {
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while (count-- && f==l)
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{
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#ifdef _MT
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f = __tolower_mt( ptloci, (unsigned char)(*(dst++)) );
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l = __tolower_mt( ptloci, (unsigned char)(*(src++)) );
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#else
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f = tolower( (unsigned char)(*(dst++)) );
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l = tolower( (unsigned char)(*(src++)) );
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#endif
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}
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}
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#endif /* !_NTSUBSET_ */
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return ( f - l );
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}
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#ifndef _M_IX86
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int __cdecl __ascii_memicmp (
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const void * first,
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const void * last,
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size_t 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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while ( count-- )
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{
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if ( (*(unsigned char *)first == *(unsigned char *)last) ||
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((f = __ascii_tolower( *(unsigned char *)first )) ==
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(l = __ascii_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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return ( f - l );
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}
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#endif
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