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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117/****mbsnbcat.c - concatenate string2 onto string1, max length n bytes** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* defines mbsnbcat() - concatenate maximum of n bytes********************************************************************************/#ifndef _MBCS #error This file should only be compiled with _MBCS defined#endif
#include <corecrt_internal.h>#include <corecrt_internal_mbstring.h>#include <locale.h>#include <string.h>
/**** _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:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" unsigned char * __cdecl _mbsnbcat_l( unsigned char *dst, const unsigned char *src, size_t cnt, _locale_t plocinfo ){ unsigned char *start;
if (!cnt) return(dst);
/* validation section */ _VALIDATE_RETURN(dst != nullptr, EINVAL, nullptr); _VALIDATE_RETURN(src != nullptr, EINVAL, nullptr);
_LocaleUpdate _loc_update(plocinfo);
_BEGIN_SECURE_CRT_DEPRECATION_DISABLE if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) return (unsigned char *)strncat((char *)dst, (const char *)src, cnt); _END_SECURE_CRT_DEPRECATION_DISABLE
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 */ if ( dst!=start && _mbsbtype_l(start, (int) ((dst - start) - 1), _loc_update.GetLocaleT()) == _MBC_LEAD ) { --dst; }
/* copy over the characters */
while (cnt--) {
if ( _ismbblead_l(*src, _loc_update.GetLocaleT()) ) { *dst++ = *src++; if (cnt == 0) { /* write null if cnt exhausted */ dst[-1] = '\0'; break; } cnt--; if ((*dst++ = *src++)=='\0') { /* or if no trail byte */ dst[-2] = '\0'; break; } } else if ((*dst++ = *src++) == '\0') break;
}
if ( dst!=start && _mbsbtype_l(start, (int) ((dst - start) - 1), _loc_update.GetLocaleT()) == _MBC_LEAD ) { dst[-1] = '\0'; } else { *dst = '\0'; }
return(start);}
extern "C" unsigned char * (__cdecl _mbsnbcat)( unsigned char *dst, const unsigned char *src, size_t cnt ){ _BEGIN_SECURE_CRT_DEPRECATION_DISABLE return _mbsnbcat_l(dst, src, cnt, nullptr); _END_SECURE_CRT_DEPRECATION_DISABLE}