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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144/****mbsnset.c - Sets first n charcaters of string to given character (MBCS)** Copyright (c) Microsoft Corporation. All rights reserved.**Purpose:* Sets first n charcaters of string to given character (MBCS)********************************************************************************/#ifndef _MBCS #error This file should only be compiled with _MBCS defined#endif
#include <corecrt_internal_mbstring.h>#include <locale.h>#include <string.h>
/**** _mbsnset - Sets first n charcaters of string to given character (MBCS)**Purpose:* Sets the first n characters of string to the supplied* character value. If the length of string is less than n,* the length of string is used in place of n. Handles* MBCS chars correctly.** There are several factors that make this routine complicated:* (1) The fill value may be 1 or 2 bytes long.* (2) The fill operation may end by hitting the count value* or by hitting the end of the string.* (3) A null terminating char is NOT placed at the end of* the string.** Cases to be careful of (both of these can occur at once):* (1) Leaving an "orphaned" trail byte in the string (e.g.,* overwriting a lead byte but not the corresponding trail byte).* (2) Writing only the 1st byte of a 2-byte fill value because the* end of string was encountered.**Entry:* unsigned char *string = string to modify* unsigned int val = value to fill string with* size_t count = count of characters to fill***Exit:* Returns string = now filled with char val**Uses:**Exceptions:* Input parameters are validated. Refer to the validation section of the function.********************************************************************************/
extern "C" unsigned char * __cdecl _mbsnset_l( unsigned char *string, unsigned int val, size_t count, _locale_t plocinfo ){ unsigned char *start = string; unsigned int leadbyte = 0; unsigned char highval, lowval; _LocaleUpdate _loc_update(plocinfo);
/* validation section */ _VALIDATE_RETURN(string != nullptr || count == 0, EINVAL, nullptr);
/* * leadbyte flag indicates if the last byte we overwrote was * a lead byte or not. */_BEGIN_SECURE_CRT_DEPRECATION_DISABLE if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) return (unsigned char *)_strnset((char *)string, val, count);_END_SECURE_CRT_DEPRECATION_DISABLE
highval = static_cast<unsigned char>(val >> 8); if (highval != 0) {
/* double byte value */
lowval = (unsigned char)(val & 0x00ff);
if(lowval=='\0') { _ASSERTE(("invalid MBCS pair passed to mbsnset",0));
/* Ideally we would return nullptr here and signal an error condition. But since this function has no other error modes, there would be a good chance of crashing the caller. So instead we fill the string with spaces to ensure that no information leaks through unexpectedly. Anyway, we do set errno to EINVAL. */ errno = EINVAL; lowval=highval=' '; }
while (count-- && *string) { leadbyte = _ismbbtruelead_l(leadbyte, *string, _loc_update.GetLocaleT()); *string++ = highval;
if (*string) { leadbyte = _ismbbtruelead_l(leadbyte, *string, _loc_update.GetLocaleT()); *string++ = lowval; } else /* overwrite orphaned highval byte */ *(string-1) = ' '; } }
else { /* single byte value */
while (count-- && *string) { leadbyte = _ismbbtruelead_l(leadbyte, *string, _loc_update.GetLocaleT()); *string++ = (unsigned char)val; } }
/* overwrite orphaned trailing byte, if necessary */ if(leadbyte && *string) *string = ' ';
return( start );}
unsigned char * (__cdecl _mbsnset)( unsigned char *string, unsigned int val, size_t count ){_BEGIN_SECURE_CRT_DEPRECATION_DISABLE return _mbsnset_l(string, val, count, nullptr);_END_SECURE_CRT_DEPRECATION_DISABLE}