91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/***
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*mbsnbcnt.c - Returns byte count of MBCS string
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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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* Returns byte count of MBCS string
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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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* 05-19-94 CFW Enable non-Win32.
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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 <mbstring.h>
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/***
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* _mbsnbcnt - Returns byte count of MBCS string
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*
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*Purpose:
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* Returns the number of bytes between the start of the supplied
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* string and the char count supplied. That is, this routine
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* indicates how many bytes are in the first "ccnt" characters
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* of the string.
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*
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*Entry:
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* unsigned char *string = pointer to string
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* unsigned int ccnt = number of characters to scan
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*
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*Exit:
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* Returns number of bytes between string and ccnt.
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*
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* If the end of the string is encountered before ccnt chars were
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* scanned, then the length of the string in bytes is returned.
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*
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*Exceptions:
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*
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*******************************************************************************/
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size_t __cdecl _mbsnbcnt(
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const unsigned char *string,
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size_t ccnt
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)
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{
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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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return __mbsnbcnt_mt(ptmbci, string, ccnt);
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}
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size_t __cdecl __mbsnbcnt_mt(
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pthreadmbcinfo ptmbci,
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const unsigned char *string,
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size_t ccnt
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)
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{
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#endif
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unsigned char *p;
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for (p = (char *)string; (ccnt-- && *p); p++) {
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#ifdef _MT
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if ( __ismbblead_mt(ptmbci, *p) ) {
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#else
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if ( _ismbblead(*p) ) {
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#endif
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if (*++p == '\0') {
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--p;
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break;
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}
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}
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}
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return ((size_t) ((char *)p - (char *)string));
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}
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#endif /* _MBCS */
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