137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
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/***
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*strnicmp.c - compare n chars of strings, ignoring case
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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 _strnicmp() - Compares at most n characters of two strings,
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* without regard to case.
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*
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*Revision History:
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* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
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* copyright.
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* 10-02-90 GJF New-style function declarator.
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* 01-18-91 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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* 09-03-93 GJF Replaced _CALLTYPE1 with __cdecl.
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* 09-21-93 CFW Avoid cast bug.
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* 01-13-94 CFW Fix Comments.
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* 10-19-94 GJF Sped up C locale. Also, made multi-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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* 08-11-98 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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* 26-01-00 GB Modified strnicmp 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 _strnicmp(first, last, count) - compares count char of strings, ignore case
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*
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*Purpose:
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* Compare the two strings for lexical order. Stops the comparison
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* when the following occurs: (1) strings differ, (2) the end of the
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* strings is reached, or (3) count characters have been compared.
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* For the purposes of the comparison, upper case characters are
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* converted to lower case.
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*
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*Entry:
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* char *first, *last - strings to compare
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* size_t count - maximum number of characters 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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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _strnicmp (
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const char * dst,
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const char * src,
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size_t count
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)
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{
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int f,l;
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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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#endif
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if ( count )
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{
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#if !defined(_NTSUBSET_)
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#ifdef _MT
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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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#endif /* !_NTSUBSET_ */
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return __ascii_strnicmp(dst, src, count);
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#if !defined(_NTSUBSET_)
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}
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else {
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do {
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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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} while (--count && f && (f == l) );
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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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return( 0 );
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}
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#ifndef _M_IX86
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int __cdecl __ascii_strnicmp (
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const char * first,
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const char * last,
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size_t count
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)
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{
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int f, l;
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do {
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if ( ((f = (unsigned char)(*(first++))) >= 'A') &&
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(f <= 'Z') )
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f -= 'A' - 'a';
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if ( ((l = (unsigned char)(*(last++))) >= 'A') &&
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(l <= 'Z') )
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l -= 'A' - 'a';
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} while ( --count && f && (f == l) );
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return ( f - l );
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}
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#endif
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