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81 lines
1.9 KiB
81 lines
1.9 KiB
/***
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*ismbslead.c - True _ismbslead function
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*
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* Copyright (c) 1985-1994, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Contains the function _ismbslead, which is a true context-sensitive
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* MBCS lead-byte function. While much less efficient than _ismbblead,
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* it is also much more sophisticated, in that it determines whether a
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* given sub-string pointer points to a lead byte or not, taking into
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* account the context in the string.
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*
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*Revision History:
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* 08-03-93 KRS Ported from 16-bit tree.
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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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*
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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 <stddef.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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* int _ismbslead(const unsigned char *string, const unsigned char *current);
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*
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*Purpose:
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*
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* _ismbslead - Check, in context, for MBCS lead byte
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*
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*Entry:
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* unsigned char *string - ptr to start of string or previous known lead byte
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* unsigned char *current - ptr to position in string to be tested
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*
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*Exit:
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* TRUE : -1
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* FALSE : 0
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*
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*Exceptions:
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*
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*******************************************************************************/
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int __cdecl _ismbslead(
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const unsigned char *string,
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const unsigned char *current
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)
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{
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if (0 == __mbcodepage)
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return 0;
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_mlock(_MB_CP_LOCK);
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while (string <= current && *string) {
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if (_ISLEADBYTE((*string))) {
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if (string++ == current) /* check lead byte */
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{
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_munlock(_MB_CP_LOCK);
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return -1;
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}
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if (!(*string))
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{
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_munlock(_MB_CP_LOCK);
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return 0;
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}
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}
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++string;
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}
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_munlock(_MB_CP_LOCK);
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return 0;
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}
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#endif
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