98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
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/***
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*mbscmp.c - Compare 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 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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* 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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* 04-06-98 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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* _mbscmp - Compare MBCS strings
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*
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*Purpose:
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* Compares two strings for lexical order. Strings
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* are compared on a character basis, not a byte basis.
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*
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*Entry:
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* char *s1, *s2 = strings 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 _mbscmp(
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const unsigned char *s1,
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const unsigned char *s2
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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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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 strcmp(s1, s2);
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for (;;) {
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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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}
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#endif /* _MBCS */
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