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.
144 lines
4.3 KiB
144 lines
4.3 KiB
/***
|
|
*mbsnset.c - Sets first n charcaters of string to given character (MBCS)
|
|
*
|
|
* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* Sets first n charcaters of string to given character (MBCS)
|
|
*
|
|
*Revision History:
|
|
* 11-19-92 KRS Ported from 16-bit sources.
|
|
* 08-20-93 CFW Change short params to int for 32-bit tree.
|
|
* 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.
|
|
* 04-17-98 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>
|
|
|
|
|
|
/***
|
|
* _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:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
unsigned char * __cdecl _mbsnset(
|
|
unsigned char *string,
|
|
unsigned int val,
|
|
size_t count
|
|
)
|
|
{
|
|
unsigned char *start = string;
|
|
unsigned int leadbyte = 0;
|
|
unsigned char highval, lowval;
|
|
#ifdef _MT
|
|
pthreadmbcinfo ptmbci = _getptd()->ptmbcinfo;
|
|
|
|
if ( ptmbci != __ptmbcinfo )
|
|
ptmbci = __updatetmbcinfo();
|
|
#endif
|
|
|
|
/*
|
|
* leadbyte flag indicates if the last byte we overwrote was
|
|
* a lead byte or not.
|
|
*/
|
|
#ifdef _MT
|
|
if ( _ISNOTMBCP_MT(ptmbci) )
|
|
#else
|
|
if ( _ISNOTMBCP )
|
|
#endif
|
|
return _strnset(string, val, count);
|
|
|
|
if (highval = (unsigned char)(val>>8)) {
|
|
|
|
/* double byte value */
|
|
|
|
lowval = (unsigned char)(val & 0x00ff);
|
|
|
|
while (count-- && *string) {
|
|
#ifdef _MT
|
|
leadbyte = __ismbbtruelead_mt(ptmbci, leadbyte, *string);
|
|
#else
|
|
leadbyte = _ismbbtruelead(leadbyte, *string);
|
|
#endif
|
|
*string++ = highval;
|
|
|
|
if (*string) {
|
|
#ifdef _MT
|
|
leadbyte = __ismbbtruelead_mt(ptmbci, leadbyte, *string);
|
|
#else
|
|
leadbyte = _ismbbtruelead(leadbyte, *string);
|
|
#endif
|
|
*string++ = lowval;
|
|
}
|
|
else
|
|
/* overwrite orphaned highval byte */
|
|
*(string-1) = ' ';
|
|
}
|
|
}
|
|
|
|
else {
|
|
/* single byte value */
|
|
|
|
while (count-- && *string) {
|
|
#ifdef _MT
|
|
leadbyte = __ismbbtruelead_mt(ptmbci, leadbyte, *string);
|
|
#else
|
|
leadbyte = _ismbbtruelead(leadbyte, *string);
|
|
#endif
|
|
*string++ = (unsigned char)val;
|
|
}
|
|
}
|
|
|
|
/* overwrite orphaned trailing byte, if necessary */
|
|
if(leadbyte && *string)
|
|
*string = ' ';
|
|
|
|
return( start );
|
|
}
|
|
|
|
#endif /* _MBCS */
|