100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/***
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*mbsnbcat.c - concatenate string2 onto string1, max length n bytes
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*
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* Copyright (c) 1985-1993, 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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*
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*******************************************************************************/
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#ifdef _MBCS
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#include <cruntime.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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#define _MBSBTYPE(str,len) _mbsbtype(str,len)
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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 * _CRTAPI1 _mbsnbcat(dst, src, cnt)
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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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unsigned char *start;
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if (!cnt)
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return(dst);
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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 _KANJI
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if (_MBSBTYPE(start, (int) ((dst - start) - 1)) == _MBC_LEAD)
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--dst;
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#else /* _MBCS_OS */
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if (_ismbslead(start, dst))
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--dst;
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#endif
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/* copy over the characters */
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while (cnt--) {
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if (_ISLEADBYTE(*src)) {
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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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if (_MBSBTYPE(start, (int) ((dst - start) - 1)) == _MBC_LEAD)
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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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