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55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS CRT
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* PURPOSE: Implementation of _mbstrnlen
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* FILE: lib/sdk/crt/string/_mbstrnlen.c
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* PROGRAMMER: Timo Kreuzer
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*/
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#include <precomp.h>
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#include <mbctype.h>
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#include <specstrings.h>
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_Success_(return>0)
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_Check_return_
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_CRTIMP
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size_t
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__cdecl
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_mbstrnlen(
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_In_z_ const char *pmbstr,
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_In_ size_t cjMaxLen)
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{
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size_t cchCount = 0;
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unsigned char jMbsByte;
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/* Check parameters */
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if (!MSVCRT_CHECK_PMT((pmbstr != 0)) && (cjMaxLen <= INT_MAX))
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{
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_set_errno(EINVAL);
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return -1;
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}
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/* Loop while we have bytes to process */
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while (cjMaxLen-- > 0)
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{
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/* Get next mb byte */
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jMbsByte = *pmbstr++;
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/* If this is 0, we're done */
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if (jMbsByte == 0) break;
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/* if this is a lead byte, continue with next char */
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if (_ismbblead(jMbsByte))
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{
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// FIXME: check if this is a valid char.
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continue;
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}
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/* Count this character */
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cchCount++;
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}
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return cchCount;
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}
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