mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
3.0 KiB
124 lines
3.0 KiB
/***
|
|
*mbsncat.c - concatenate string2 onto string1, max length n
|
|
*
|
|
* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* defines mbsncat() - concatenate maximum of n characters
|
|
*
|
|
*Revision History:
|
|
* 11-19-92 KRS Ported from 16-bit sources.
|
|
* 08-20-93 CFW Update _MBCS_OS support.
|
|
* 10-05-93 GJF Replaced _CRTAPI1 with __cdecl.
|
|
* 04-15-93 CFW Add _MB_CP_LOCK.
|
|
* 05-09-94 CFW Optimize for SBCS.
|
|
* 05-19-94 CFW Enable non-Win32.
|
|
* 09-11-97 GJF Replaced __mbcodepage == 0 with _ISNOTMBCP.
|
|
* 04-15-98 GJF Revised multithread support based on threadmbcinfo
|
|
* structs
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#ifdef _MBCS
|
|
|
|
#include <mtdll.h>
|
|
#include <cruntime.h>
|
|
#include <string.h>
|
|
#include <mbdata.h>
|
|
#include <mbctype.h>
|
|
#include <mbstring.h>
|
|
|
|
|
|
/***
|
|
* _mbsncat - concatenate max cnt characters onto dst
|
|
*
|
|
*Purpose:
|
|
* Concatenates src onto dst, with a maximum of cnt characters 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 characters to copy
|
|
*
|
|
*Exit:
|
|
* returns dst, with src (at least part) concatenated on
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
unsigned char * __cdecl _mbsncat(
|
|
unsigned char *dst,
|
|
const unsigned char *src,
|
|
size_t cnt
|
|
)
|
|
{
|
|
unsigned char *start;
|
|
#ifdef _MT
|
|
pthreadmbcinfo ptmbci = _getptd()->ptmbcinfo;
|
|
|
|
if ( ptmbci != __ptmbcinfo )
|
|
ptmbci = __updatetmbcinfo();
|
|
#endif
|
|
|
|
if (!cnt)
|
|
return(dst);
|
|
|
|
#ifdef _MT
|
|
if ( _ISNOTMBCP_MT(ptmbci) )
|
|
#else
|
|
if ( _ISNOTMBCP )
|
|
#endif
|
|
return strncat(dst, src, cnt);
|
|
|
|
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 _MT
|
|
if ( __ismbslead_mt(ptmbci, start, dst) )
|
|
#else
|
|
if ( _ismbslead(start, dst) )
|
|
#endif
|
|
--dst;
|
|
|
|
/* copy over the characters */
|
|
|
|
while (cnt--) {
|
|
#ifdef _MT
|
|
if ( __ismbblead_mt(ptmbci, *src) ) {
|
|
#else
|
|
if ( _ismbblead(*src) ) {
|
|
#endif
|
|
*dst++ = *src++;
|
|
if ((*dst++ = *src++) == '\0') {
|
|
dst[-2] = '\0';
|
|
break;
|
|
}
|
|
}
|
|
|
|
else if ((*dst++ = *src++) == '\0')
|
|
break;
|
|
|
|
}
|
|
|
|
/* enter final nul, if necessary */
|
|
#ifdef _MT
|
|
if ( __mbsbtype_mt(ptmbci, start, (int) ((dst - start) - 1)) ==
|
|
_MBC_LEAD )
|
|
#else
|
|
if ( _mbsbtype(start, (int) ((dst - start) - 1)) == _MBC_LEAD )
|
|
#endif
|
|
dst[-1] = '\0';
|
|
else
|
|
*dst = '\0';
|
|
|
|
return(start);
|
|
}
|
|
|
|
#endif /* _MBCS */
|