100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
|
/***
|
||
|
|
*mbsnbcat.c - concatenate string2 onto string1, max length n bytes
|
||
|
|
*
|
||
|
|
* Copyright (c) 1985-1993, Microsoft Corporation. All rights reserved.
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* defines mbsnbcat() - concatenate maximum of n bytes
|
||
|
|
*
|
||
|
|
*Revision History:
|
||
|
|
* 08-03-93 KRS Ported from 16-bit sources.
|
||
|
|
* 08-20-93 CFW Update _MBCS_OS support.
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
#ifdef _MBCS
|
||
|
|
#include <cruntime.h>
|
||
|
|
#include <mbdata.h>
|
||
|
|
#include <mbctype.h>
|
||
|
|
#include <mbstring.h>
|
||
|
|
|
||
|
|
#define _MBSBTYPE(str,len) _mbsbtype(str,len)
|
||
|
|
|
||
|
|
/***
|
||
|
|
* _mbsnbcat - concatenate max cnt bytes onto dst
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* Concatenates src onto dst, with a maximum of cnt bytes copied.
|
||
|
|
* Handles 2-byte MBCS characters correctly.
|
||
|
|
*
|
||
|
|
*Entry:
|
||
|
|
* unsigned char *dst - string to concatenate onto
|
||
|
|
* unsigned char *src - string to concatenate from
|
||
|
|
* int cnt - number of bytes to copy
|
||
|
|
*
|
||
|
|
*Exit:
|
||
|
|
* returns dst, with src (at least part) concatenated on
|
||
|
|
*
|
||
|
|
*Exceptions:
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
unsigned char * _CRTAPI1 _mbsnbcat(dst, src, cnt)
|
||
|
|
unsigned char *dst;
|
||
|
|
const unsigned char *src;
|
||
|
|
size_t cnt;
|
||
|
|
{
|
||
|
|
unsigned char *start;
|
||
|
|
|
||
|
|
if (!cnt)
|
||
|
|
return(dst);
|
||
|
|
|
||
|
|
start = dst;
|
||
|
|
while (*dst++)
|
||
|
|
;
|
||
|
|
--dst; // dst now points to end of dst string
|
||
|
|
|
||
|
|
|
||
|
|
/* if last char in string is a lead byte, back up pointer */
|
||
|
|
|
||
|
|
#ifdef _KANJI
|
||
|
|
if (_MBSBTYPE(start, (int) ((dst - start) - 1)) == _MBC_LEAD)
|
||
|
|
--dst;
|
||
|
|
#else /* _MBCS_OS */
|
||
|
|
if (_ismbslead(start, dst))
|
||
|
|
--dst;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* copy over the characters */
|
||
|
|
|
||
|
|
while (cnt--) {
|
||
|
|
|
||
|
|
if (_ISLEADBYTE(*src)) {
|
||
|
|
*dst++ = *src++;
|
||
|
|
if (!cnt--) { /* write nul if cnt exhausted */
|
||
|
|
dst[-1] = '\0';
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if ((*dst++ = *src++)=='\0') { /* or if no trail byte */
|
||
|
|
dst[-2] = '\0';
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
else if ((*dst++ = *src++) == '\0')
|
||
|
|
break;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* enter final nul, if necessary */
|
||
|
|
|
||
|
|
if (_MBSBTYPE(start, (int) ((dst - start) - 1)) == _MBC_LEAD)
|
||
|
|
dst[-1] = '\0';
|
||
|
|
else
|
||
|
|
*dst = '\0';
|
||
|
|
|
||
|
|
|
||
|
|
return(start);
|
||
|
|
}
|
||
|
|
#endif /* _MBCS */
|