128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
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/***
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*mbsnbcat.c - concatenate string2 onto string1, max length n bytes
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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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* defines mbsnbcat() - concatenate maximum of n bytes
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*
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*Revision History:
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* 08-03-93 KRS Ported from 16-bit sources.
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* 08-20-93 CFW Update _MBCS_OS support.
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* 09-24-93 CFW Merge _MBCS_OS and _KANJI.
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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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* 04-07-98 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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* _mbsnbcat - concatenate max cnt bytes onto dst
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*
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*Purpose:
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* Concatenates src onto dst, with a maximum of cnt bytes copied.
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* Handles 2-byte MBCS characters correctly.
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*
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*Entry:
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* unsigned char *dst - string to concatenate onto
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* unsigned char *src - string to concatenate from
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* int cnt - number of bytes to copy
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*
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*Exit:
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* returns dst, with src (at least part) concatenated on
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*
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*Exceptions:
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*
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*******************************************************************************/
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unsigned char * __cdecl _mbsnbcat(
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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;
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#ifdef _MT
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pthreadmbcinfo ptmbci = _getptd()->ptmbcinfo;
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#endif
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if (!cnt)
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return(dst);
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#ifdef _MT
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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 strncat(dst, src, cnt);
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start = dst;
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while (*dst++)
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;
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--dst; // dst now points to end of dst string
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/* if last char in string is a lead byte, back up pointer */
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#ifdef _MT
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if ( __mbsbtype_mt(ptmbci, start, (int) ((dst - start) - 1)) == _MBC_LEAD )
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#else
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if ( _mbsbtype(start, (int) ((dst - start) - 1)) == _MBC_LEAD )
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#endif
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--dst;
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/* copy over the characters */
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while (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--) { /* write nul if cnt exhausted */
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dst[-1] = '\0';
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break;
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}
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if ((*dst++ = *src++)=='\0') { /* or if no trail byte */
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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 if ((*dst++ = *src++) == '\0')
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break;
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}
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/* enter final nul, if necessary */
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#ifdef _MT
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if ( __mbsbtype_mt(ptmbci, start, (int) ((dst - start) - 1)) == _MBC_LEAD )
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#else
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if ( _mbsbtype(start, (int) ((dst - start) - 1)) == _MBC_LEAD )
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#endif
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dst[-1] = '\0';
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else
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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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