107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
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/***
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*mbsnbcpy.c - Copy one string to another, n bytes only (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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* Copy one string to another, n bytes only (MBCS)
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*
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*Revision History:
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* 05-19-93 KRS Created from mbsncpy.
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* 08-03-93 KRS Fix logic bug.
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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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* 04-13-98 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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* _mbsnbcpy - Copy one string to another, n bytes only (MBCS)
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*
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*Purpose:
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* Copies exactly cnt bytes from src to dst. If strlen(src) < cnt, the
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* remaining character are padded with null bytes. If strlen >= cnt, no
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* terminating null byte is added. 2-byte MBCS characters are handled
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* correctly.
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*
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*Entry:
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* unsigned char *dst = destination for copy
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* unsigned char *src = source for copy
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* int cnt = number of characters to copy
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*
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*Exit:
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* returns dst = destination of copy
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*
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*Exceptions:
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*
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*******************************************************************************/
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unsigned char * __cdecl _mbsnbcpy(
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unsigned char *dst,
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const unsigned char *src,
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size_t cnt
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)
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{
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unsigned char *start = dst;
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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 strncpy(dst, src, cnt);
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while (cnt) {
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cnt--;
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#ifdef _MT
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if ( __ismbblead_mt(ptmbci, *src) ) {
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#else
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if ( _ismbblead(*src) ) {
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#endif
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*dst++ = *src++;
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if (!cnt) {
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dst[-1] = '\0';
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break;
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}
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cnt--;
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if ((*dst++ = *src++) == '\0') {
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dst[-2] = '\0';
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break;
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}
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}
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else
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if ((*dst++ = *src++) == '\0')
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break;
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}
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/* pad with nulls as needed */
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while (cnt--)
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*dst++ = '\0';
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return start;
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}
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#endif /* _MBCS */
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