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scuffed-code/common/uinvchar.cpp

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 1999-2010, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: uinvchar.c
* encoding: UTF-8
* tab size: 8 (not used)
* indentation:2
*
* created on: 2004sep14
* created by: Markus W. Scherer
*
* Functions for handling invariant characters, moved here from putil.c
* for better modularization.
*/
#include "unicode/utypes.h"
#include "unicode/ustring.h"
#include "udataswp.h"
#include "cstring.h"
#include "cmemory.h"
#include "uassert.h"
#include "uinvchar.h"
/* invariant-character handling --------------------------------------------- */
/*
* These maps for ASCII to/from EBCDIC map invariant characters (see utypes.h)
* appropriately for most EBCDIC codepages.
*
* They currently also map most other ASCII graphic characters,
* appropriately for codepages 37 and 1047.
* Exceptions: The characters for []^ have different codes in 37 & 1047.
* Both versions are mapped to ASCII.
*
* ASCII 37 1047
* [ 5B BA AD
* ] 5D BB BD
* ^ 5E B0 5F
*
* There are no mappings for variant characters from Unicode to EBCDIC.
*
* Currently, C0 control codes are also included in these maps.
* Exceptions: S/390 Open Edition swaps LF and NEL codes compared with other
* EBCDIC platforms; both codes (15 and 25) are mapped to ASCII LF (0A),
* but there is no mapping for ASCII LF back to EBCDIC.
*
* ASCII EBCDIC S/390-OE
* LF 0A 25 15
* NEL 85 15 25
*
* The maps below explicitly exclude the variant
* control and graphical characters that are in ASCII-based
* codepages at 0x80 and above.
* "No mapping" is expressed by mapping to a 00 byte.
*
* These tables do not establish a converter or a codepage.
*/
static const uint8_t asciiFromEbcdic[256]={
0x00, 0x01, 0x02, 0x03, 0x00, 0x09, 0x00, 0x7f, 0x00, 0x00, 0x00, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x00, 0x0a, 0x08, 0x00, 0x18, 0x19, 0x00, 0x00, 0x1c, 0x1d, 0x1e, 0x1f,
0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x17, 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07,
0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x00, 0x1a,
0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2e, 0x3c, 0x28, 0x2b, 0x7c,
0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x5e,
0x2d, 0x2f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x25, 0x5f, 0x3e, 0x3f,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x3a, 0x23, 0x40, 0x27, 0x3d, 0x22,
0x00, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x7e, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x00, 0x00, 0x00, 0x5b, 0x00, 0x00,
0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5b, 0x5d, 0x00, 0x5d, 0x00, 0x00,
0x7b, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x7d, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x5c, 0x00, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const uint8_t ebcdicFromAscii[256]={
0x00, 0x01, 0x02, 0x03, 0x37, 0x2d, 0x2e, 0x2f, 0x16, 0x05, 0x00, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x3c, 0x3d, 0x32, 0x26, 0x18, 0x19, 0x3f, 0x27, 0x1c, 0x1d, 0x1e, 0x1f,
0x40, 0x00, 0x7f, 0x00, 0x00, 0x6c, 0x50, 0x7d, 0x4d, 0x5d, 0x5c, 0x4e, 0x6b, 0x60, 0x4b, 0x61,
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0x7a, 0x5e, 0x4c, 0x7e, 0x6e, 0x6f,
0x00, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,
0xd7, 0xd8, 0xd9, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0x00, 0x00, 0x00, 0x00, 0x6d,
0x00, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0x00, 0x00, 0x00, 0x00, 0x07,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* Same as asciiFromEbcdic[] except maps all letters to lowercase. */
static const uint8_t lowercaseAsciiFromEbcdic[256]={
0x00, 0x01, 0x02, 0x03, 0x00, 0x09, 0x00, 0x7f, 0x00, 0x00, 0x00, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x00, 0x0a, 0x08, 0x00, 0x18, 0x19, 0x00, 0x00, 0x1c, 0x1d, 0x1e, 0x1f,
0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x17, 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07,
0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x00, 0x1a,
0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2e, 0x3c, 0x28, 0x2b, 0x7c,
0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x5e,
0x2d, 0x2f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x25, 0x5f, 0x3e, 0x3f,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x3a, 0x23, 0x40, 0x27, 0x3d, 0x22,
0x00, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x7e, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x00, 0x00, 0x00, 0x5b, 0x00, 0x00,
0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5b, 0x5d, 0x00, 0x5d, 0x00, 0x00,
0x7b, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x7d, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x7c, 0x00, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
/*
* Bit sets indicating which characters of the ASCII repertoire
* (by ASCII/Unicode code) are "invariant".
* See utypes.h for more details.
*
* As invariant are considered the characters of the ASCII repertoire except
* for the following:
* 21 '!' <exclamation mark>
* 23 '#' <number sign>
* 24 '$' <dollar sign>
*
* 40 '@' <commercial at>
*
* 5b '[' <left bracket>
* 5c '\' <backslash>
* 5d ']' <right bracket>
* 5e '^' <circumflex>
*
* 60 '`' <grave accent>
*
* 7b '{' <left brace>
* 7c '|' <vertical line>
* 7d '}' <right brace>
* 7e '~' <tilde>
*/
static const uint32_t invariantChars[4]={
0xfffffbff, /* 00..1f but not 0a */
0xffffffe5, /* 20..3f but not 21 23 24 */
0x87fffffe, /* 40..5f but not 40 5b..5e */
0x87fffffe /* 60..7f but not 60 7b..7e */
};
/*
* test unsigned types (or values known to be non-negative) for invariant characters,
* tests ASCII-family character values
*/
#define UCHAR_IS_INVARIANT(c) (((c)<=0x7f) && (invariantChars[(c)>>5]&((uint32_t)1<<((c)&0x1f)))!=0)
/* test signed types for invariant characters, adds test for positive values */
#define SCHAR_IS_INVARIANT(c) ((0<=(c)) && UCHAR_IS_INVARIANT(c))
#if U_CHARSET_FAMILY==U_ASCII_FAMILY
#define CHAR_TO_UCHAR(c) c
#define UCHAR_TO_CHAR(c) c
#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
#define CHAR_TO_UCHAR(u) asciiFromEbcdic[u]
#define UCHAR_TO_CHAR(u) ebcdicFromAscii[u]
#else
# error U_CHARSET_FAMILY is not valid
#endif
U_CAPI void U_EXPORT2
u_charsToUChars(const char *cs, UChar *us, int32_t length) {
UChar u;
uint8_t c;
/*
* Allow the entire ASCII repertoire to be mapped _to_ Unicode.
* For EBCDIC systems, this works for characters with codes from
* codepages 37 and 1047 or compatible.
*/
while(length>0) {
c=(uint8_t)(*cs++);
u=(UChar)CHAR_TO_UCHAR(c);
U_ASSERT((u!=0 || c==0)); /* only invariant chars converted? */
*us++=u;
--length;
}
}
U_CAPI void U_EXPORT2
u_UCharsToChars(const UChar *us, char *cs, int32_t length) {
UChar u;
while(length>0) {
u=*us++;
if(!UCHAR_IS_INVARIANT(u)) {
U_ASSERT(false); /* Variant characters were used. These are not portable in ICU. */
u=0;
}
*cs++=(char)UCHAR_TO_CHAR(u);
--length;
}
}
U_CAPI UBool U_EXPORT2
uprv_isInvariantString(const char *s, int32_t length) {
uint8_t c;
for(;;) {
if(length<0) {
/* NUL-terminated */
c=(uint8_t)*s++;
if(c==0) {
break;
}
} else {
/* count length */
if(length==0) {
break;
}
--length;
c=(uint8_t)*s++;
if(c==0) {
continue; /* NUL is invariant */
}
}
/* c!=0 now, one branch below checks c==0 for variant characters */
/*
* no assertions here because these functions are legitimately called
* for strings with variant characters
*/
#if U_CHARSET_FAMILY==U_ASCII_FAMILY
if(!UCHAR_IS_INVARIANT(c)) {
return false; /* found a variant char */
}
#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
c=CHAR_TO_UCHAR(c);
if(c==0 || !UCHAR_IS_INVARIANT(c)) {
return false; /* found a variant char */
}
#else
# error U_CHARSET_FAMILY is not valid
#endif
}
return true;
}
U_CAPI UBool U_EXPORT2
uprv_isInvariantUString(const UChar *s, int32_t length) {
UChar c;
for(;;) {
if(length<0) {
/* NUL-terminated */
c=*s++;
if(c==0) {
break;
}
} else {
/* count length */
if(length==0) {
break;
}
--length;
c=*s++;
}
/*
* no assertions here because these functions are legitimately called
* for strings with variant characters
*/
if(!UCHAR_IS_INVARIANT(c)) {
return false; /* found a variant char */
}
}
return true;
}
/* UDataSwapFn implementations used in udataswp.c ------- */
/* convert ASCII to EBCDIC and verify that all characters are invariant */
U_CAPI int32_t U_EXPORT2
uprv_ebcdicFromAscii(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode) {
const uint8_t *s;
uint8_t *t;
uint8_t c;
int32_t count;
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return 0;
}
if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
/* setup and swapping */
s=(const uint8_t *)inData;
t=(uint8_t *)outData;
count=length;
while(count>0) {
c=*s++;
if(!UCHAR_IS_INVARIANT(c)) {
udata_printError(ds, "uprv_ebcdicFromAscii() string[%d] contains a variant character in position %d\n",
length, length-count);
*pErrorCode=U_INVALID_CHAR_FOUND;
return 0;
}
*t++=ebcdicFromAscii[c];
--count;
}
return length;
}
/* this function only checks and copies ASCII strings without conversion */
U_CFUNC int32_t
uprv_copyAscii(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode) {
const uint8_t *s;
uint8_t c;
int32_t count;
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return 0;
}
if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
/* setup and checking */
s=(const uint8_t *)inData;
count=length;
while(count>0) {
c=*s++;
if(!UCHAR_IS_INVARIANT(c)) {
udata_printError(ds, "uprv_copyFromAscii() string[%d] contains a variant character in position %d\n",
length, length-count);
*pErrorCode=U_INVALID_CHAR_FOUND;
return 0;
}
--count;
}
if(length>0 && inData!=outData) {
uprv_memcpy(outData, inData, length);
}
return length;
}
/* convert EBCDIC to ASCII and verify that all characters are invariant */
U_CFUNC int32_t
uprv_asciiFromEbcdic(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode) {
const uint8_t *s;
uint8_t *t;
uint8_t c;
int32_t count;
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return 0;
}
if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
/* setup and swapping */
s=(const uint8_t *)inData;
t=(uint8_t *)outData;
count=length;
while(count>0) {
c=*s++;
if(c!=0 && ((c=asciiFromEbcdic[c])==0 || !UCHAR_IS_INVARIANT(c))) {
udata_printError(ds, "uprv_asciiFromEbcdic() string[%d] contains a variant character in position %d\n",
length, length-count);
*pErrorCode=U_INVALID_CHAR_FOUND;
return 0;
}
*t++=c;
--count;
}
return length;
}
/* this function only checks and copies EBCDIC strings without conversion */
U_CFUNC int32_t
uprv_copyEbcdic(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode) {
const uint8_t *s;
uint8_t c;
int32_t count;
if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
return 0;
}
if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
/* setup and checking */
s=(const uint8_t *)inData;
count=length;
while(count>0) {
c=*s++;
if(c!=0 && ((c=asciiFromEbcdic[c])==0 || !UCHAR_IS_INVARIANT(c))) {
udata_printError(ds, "uprv_copyEbcdic() string[%] contains a variant character in position %d\n",
length, length-count);
*pErrorCode=U_INVALID_CHAR_FOUND;
return 0;
}
--count;
}
if(length>0 && inData!=outData) {
uprv_memcpy(outData, inData, length);
}
return length;
}
U_CFUNC UBool
uprv_isEbcdicAtSign(char c) {
static const uint8_t ebcdicAtSigns[] = {
0x7C, 0x44, 0x66, 0x80, 0xAC, 0xAE, 0xAF, 0xB5, 0xEC, 0xEF, 0x00 };
return c != 0 && uprv_strchr((const char *)ebcdicAtSigns, c) != nullptr;
}
/* compare invariant strings; variant characters compare less than others and unlike each other */
U_CFUNC int32_t
uprv_compareInvAscii(const UDataSwapper *ds,
const char *outString, int32_t outLength,
const UChar *localString, int32_t localLength) {
(void)ds;
int32_t minLength;
UChar32 c1, c2;
uint8_t c;
if(outString==NULL || outLength<-1 || localString==NULL || localLength<-1) {
return 0;
}
if(outLength<0) {
outLength=(int32_t)uprv_strlen(outString);
}
if(localLength<0) {
localLength=u_strlen(localString);
}
minLength= outLength<localLength ? outLength : localLength;
while(minLength>0) {
c=(uint8_t)*outString++;
if(UCHAR_IS_INVARIANT(c)) {
c1=c;
} else {
c1=-1;
}
c2=*localString++;
if(!UCHAR_IS_INVARIANT(c2)) {
c2=-2;
}
if((c1-=c2)!=0) {
return c1;
}
--minLength;
}
/* strings start with same prefix, compare lengths */
return outLength-localLength;
}
U_CFUNC int32_t
uprv_compareInvEbcdic(const UDataSwapper *ds,
const char *outString, int32_t outLength,
const UChar *localString, int32_t localLength) {
(void)ds;
int32_t minLength;
UChar32 c1, c2;
uint8_t c;
if(outString==NULL || outLength<-1 || localString==NULL || localLength<-1) {
return 0;
}
if(outLength<0) {
outLength=(int32_t)uprv_strlen(outString);
}
if(localLength<0) {
localLength=u_strlen(localString);
}
minLength= outLength<localLength ? outLength : localLength;
while(minLength>0) {
c=(uint8_t)*outString++;
if(c==0) {
c1=0;
} else if((c1=asciiFromEbcdic[c])!=0 && UCHAR_IS_INVARIANT(c1)) {
/* c1 is set */
} else {
c1=-1;
}
c2=*localString++;
if(!UCHAR_IS_INVARIANT(c2)) {
c2=-2;
}
if((c1-=c2)!=0) {
return c1;
}
--minLength;
}
/* strings start with same prefix, compare lengths */
return outLength-localLength;
}
U_CAPI int32_t U_EXPORT2
uprv_compareInvEbcdicAsAscii(const char *s1, const char *s2) {
int32_t c1, c2;
for(;; ++s1, ++s2) {
c1=(uint8_t)*s1;
c2=(uint8_t)*s2;
if(c1!=c2) {
if(c1!=0 && ((c1=asciiFromEbcdic[c1])==0 || !UCHAR_IS_INVARIANT(c1))) {
c1=-(int32_t)(uint8_t)*s1;
}
if(c2!=0 && ((c2=asciiFromEbcdic[c2])==0 || !UCHAR_IS_INVARIANT(c2))) {
c2=-(int32_t)(uint8_t)*s2;
}
return c1-c2;
} else if(c1==0) {
return 0;
}
}
}
U_CAPI char U_EXPORT2
uprv_ebcdicToAscii(char c) {
return (char)asciiFromEbcdic[(uint8_t)c];
}
U_CAPI char U_EXPORT2
uprv_ebcdicToLowercaseAscii(char c) {
return (char)lowercaseAsciiFromEbcdic[(uint8_t)c];
}
U_CAPI uint8_t* U_EXPORT2
uprv_aestrncpy(uint8_t *dst, const uint8_t *src, int32_t n)
{
uint8_t *orig_dst = dst;
if(n==-1) {
n = static_cast<int32_t>(uprv_strlen((const char*)src)+1); /* copy NUL */
}
/* copy non-null */
while(*src && n>0) {
*(dst++) = asciiFromEbcdic[*(src++)];
n--;
}
/* pad */
while(n>0) {
*(dst++) = 0;
n--;
}
return orig_dst;
}
U_CAPI uint8_t* U_EXPORT2
uprv_eastrncpy(uint8_t *dst, const uint8_t *src, int32_t n)
{
uint8_t *orig_dst = dst;
if(n==-1) {
n = static_cast<int32_t>(uprv_strlen((const char*)src)+1); /* copy NUL */
}
/* copy non-null */
while(*src && n>0) {
char ch = ebcdicFromAscii[*(src++)];
if(ch == 0) {
ch = ebcdicFromAscii[0x3f]; /* questionmark (subchar) */
}
*(dst++) = ch;
n--;
}
/* pad */
while(n>0) {
*(dst++) = 0;
n--;
}
return orig_dst;
}
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