81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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* DESCRIBE IT HERE!
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*
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****************************************************************************/
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#include "variety.h"
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#include <string.h>
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#ifdef M_I86
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extern int _fast_strncmp( const char _WCFAR *, const char _WCFAR *, size_t );
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#pragma aux _fast_strncmp = \
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0x1e /* push ds */ \
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0x96 /* xchg si,ax */\
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0x8e 0xd8 /* mov ds,ax */\
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0x89 0xfa /* mov dx,di */ \
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0x30 0xc0 /* xor al,al */ \
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0xf2 0xae /* repne scasb */ \
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0x89 0xf9 /* mov cx,di */ \
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0x89 0xd7 /* mov di,dx */ \
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0x29 0xf9 /* sub cx,di */ \
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0xf3 0xa6 /* repe cmpsb */ \
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0x74 0x05 /* je L1 */ \
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0x19 0xc9 /* sbb cx,cx */ \
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0x83 0xd9 0xff /* sbb cx,ffffh */ \
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/* L1: */ \
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0x1f /* pop ds */\
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parm caller [si ax] [es di] [cx] \
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value [cx] \
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modify exact [dx ax di cx si];
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#endif
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/* return <0 if s<t, 0 if s==t, >0 if s>t */
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_WCRTLINK int _fstrncmp( const char _WCFAR *s, const char _WCFAR *t, size_t n )
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{
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#if defined(M_I86)
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if( n ) {
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return( _fast_strncmp( s, t, n ) );
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}
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return( 0 );
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#else
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for(;;) {
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if( n == 0 ) return( 0 ); /* equal */
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if( *s != *t ) return( *s - *t ); /* less than or greater than */
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if( *s == '\0' ) return( 0 ); /* equal */
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++s;
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++t;
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--n;
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}
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#endif
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}
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