108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
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/***
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*mbsncmp.c - Compare n characters of two MBCS strings
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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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* Compare n characters of two MBCS strings
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*
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*Revision History:
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* 11-19-92 KRS Ported from 16-bit sources.
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* 10-05-93 GJF Replaced _CRTAPI1 with __cdecl.
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* 04-12-94 CFW Make function generic.
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* 04-15-93 CFW Add _MB_CP_LOCK.
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* 04-21-93 CFW Update pointer.
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* 05-05-94 CFW Work around NT/Chico bug: CompareString ignores
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* control characters.
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* 05-09-94 CFW Optimize for SBCS, no re-scan if CompareString fixed.
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* 05-12-94 CFW Back to hard-coded, CompareString sort is backwards.
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* 05-19-94 CFW Enable non-Win32.
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* 09-11-97 GJF Replaced __mbcodepage == 0 with _ISNOTMBCP.
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* 04-15-98 GJF Revised multithread support based on threadmbcinfo
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* structs
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*
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*******************************************************************************/
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#ifdef _MBCS
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#include <mtdll.h>
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#include <cruntime.h>
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#include <mbdata.h>
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#include <mbctype.h>
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#include <string.h>
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#include <mbstring.h>
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/***
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*int mbsncmp(s1, s2, n) - Compare n characters of two MBCS strings
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*
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*Purpose:
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* Compares up to n charcters of two strings for lexical order.
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* Strings are compared on a character basis, not a byte basis.
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*
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*Entry:
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* unsigned char *s1, *s2 = strings to compare
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* size_t n = maximum number of characters to compare
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*
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*Exit:
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* returns <0 if s1 < s2
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* returns 0 if s1 == s2
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* returns >0 if s1 > s2
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _mbsncmp(
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const unsigned char *s1,
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const unsigned char *s2,
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size_t n
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)
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{
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unsigned short c1, c2;
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#ifdef _MT
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pthreadmbcinfo ptmbci = _getptd()->ptmbcinfo;
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if ( ptmbci != __ptmbcinfo )
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ptmbci = __updatetmbcinfo();
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#endif
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if (n==0)
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return(0);
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#ifdef _MT
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if ( _ISNOTMBCP_MT(ptmbci) )
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#else
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if ( _ISNOTMBCP )
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#endif
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return strncmp(s1, s2, n);
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while (n--) {
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c1 = *s1++;
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#ifdef _MT
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if ( __ismbblead_mt(ptmbci, c1) )
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#else
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if ( _ismbblead(c1) )
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#endif
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c1 = ( (*s1 == '\0') ? 0 : ((c1<<8) | *s1++) );
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c2 = *s2++;
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#ifdef _MT
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if ( __ismbblead_mt(ptmbci, c2) )
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#else
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if ( _ismbblead(c2) )
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#endif
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c2 = ( (*s2 == '\0') ? 0 : ((c2<<8) | *s2++) );
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if (c1 != c2)
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return( (c1 > c2) ? 1 : -1);
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if (c1 == 0)
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return(0);
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}
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return(0);
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}
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#endif /* _MBCS */
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