100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
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/***
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*mbsrev.c - Reverse a string in place (MBCS)
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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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* Reverse a string in place (MBCS)
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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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* 04-15-93 CFW Add _MB_CP_LOCK.
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* 05-09-94 CFW Optimize for SBCS.
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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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* 04-17-98 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 <string.h>
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#include <mbdata.h>
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#include <mbctype.h>
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#include <mbstring.h>
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/***
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* _mbsrev - Reverse a string in place (MBCS)
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*
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*Purpose:
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* Reverses the order of characters in the string. The terminating
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* null character remains in place. The order of MBCS characters
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* is not changed.
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*
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*Entry:
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* unsigned char *string = string to reverse
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*
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*Exit:
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* returns string - now with reversed characters
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*
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*Exceptions:
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*
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*******************************************************************************/
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unsigned char * __cdecl _mbsrev(
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unsigned char *string
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)
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{
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unsigned char *start = string;
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unsigned char *left = string;
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unsigned char c;
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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 _strrev(string);
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/* first go through and reverse the bytes in MBCS chars */
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while ( *string ) {
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#ifdef _MT
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if ( __ismbblead_mt(ptmbci, *string++) ) {
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#else
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if ( _ismbblead(*string++) ) {
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#endif
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if ( *string ) {
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c = *string;
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*string = *(string - 1);
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*(string - 1) = c;
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string++;
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}
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else /* second byte is EOS */
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break;
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}
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}
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/* now reverse the whole string */
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string--;
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while ( left < string ) {
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c = *left;
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*left++ = *string;
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*string-- = c;
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}
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return ( start );
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}
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#endif /* _MBCS */
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