59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
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/***
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*ismbstrail.c - True _ismbstrail function
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*
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* Copyright (c) 1987-1993, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Contains the function _ismbstrail, which is a true context-sensitive
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* MBCS trail-byte function. While much less efficient than _ismbbtrail,
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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 trail 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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*
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* 08-03-93 KRS Ported from 16-bit tree.
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*
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*******************************************************************************/
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#ifdef _MBCS
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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 _ismbstrail(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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* _ismbstrail - Check, in context, for MBCS trail 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 _CRTAPI1 _ismbstrail(const unsigned char *string, const unsigned char *current)
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{
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while (string <= current && *string) {
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if (_ISLEADBYTE((*string))) {
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if (++string == current) /* check trail byte */
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return -1;
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if (!(*string))
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return 0;
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}
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++string;
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}
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return 0;
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}
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#endif
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