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6b769f3d1f81ffebba557208083a1fc161dfbe23
wxWidgets/src/common/string.cpp
Ove Kaaven 6b769f3d1f BIG glitch. 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2116 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1999-04-12 22:43:59 +00:00

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/////////////////////////////////////////////////////////////////////////////
// Name: string.cpp
// Purpose: wxString class
// Author: Vadim Zeitlin
// Modified by:
// Created: 29/01/98
// RCS-ID: $Id$
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "string.h"
#endif
/*
* About ref counting:
* 1) all empty strings use g_strEmpty, nRefs = -1 (set in Init())
* 2) AllocBuffer() sets nRefs to 1, Lock() increments it by one
* 3) Unlock() decrements nRefs and frees memory if it goes to 0
*/
// ===========================================================================
// headers, declarations, constants
// ===========================================================================
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/defs.h"
#include "wx/string.h"
#include "wx/intl.h"
#if wxUSE_THREADS
#include <wx/thread.h>
#endif
#endif
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#ifdef __SALFORDC__
#include <clib.h>
#endif
#if wxUSE_WCSRTOMBS
#include <wchar.h> // for wcsrtombs(), see comments where it's used
#endif // GNU
#ifdef WXSTRING_IS_WXOBJECT
IMPLEMENT_DYNAMIC_CLASS(wxString, wxObject)
#endif //WXSTRING_IS_WXOBJECT
// allocating extra space for each string consumes more memory but speeds up
// the concatenation operations (nLen is the current string's length)
// NB: EXTRA_ALLOC must be >= 0!
#define EXTRA_ALLOC (19 - nLen % 16)
// ---------------------------------------------------------------------------
// static class variables definition
// ---------------------------------------------------------------------------
#ifdef wxSTD_STRING_COMPATIBILITY
const size_t wxString::npos = wxSTRING_MAXLEN;
#endif // wxSTD_STRING_COMPATIBILITY
// ----------------------------------------------------------------------------
// static data
// ----------------------------------------------------------------------------
// for an empty string, GetStringData() will return this address: this
// structure has the same layout as wxStringData and it's data() method will
// return the empty string (dummy pointer)
static const struct
{
wxStringData data;
wxChar dummy;
} g_strEmpty = { {-1, 0, 0}, _T('\0') };
// empty C style string: points to 'string data' byte of g_strEmpty
extern const wxChar WXDLLEXPORT *g_szNul = &g_strEmpty.dummy;
// ----------------------------------------------------------------------------
// conditional compilation
// ----------------------------------------------------------------------------
// we want to find out if the current platform supports vsnprintf()-like
// function: for Unix this is done with configure, for Windows we test the
// compiler explicitly.
#ifdef __WXMSW__
#ifdef __VISUALC__
#define wxVsnprintf _vsnprintf
#endif
#else // !Windows
#ifdef HAVE_VSNPRINTF
#define wxVsnprintf vsnprintf
#endif
#endif // Windows/!Windows
#ifndef wxVsnprintf
// in this case we'll use vsprintf() (which is ANSI and thus should be
// always available), but it's unsafe because it doesn't check for buffer
// size - so give a warning
#define wxVsnprintf(buffer,len,format,argptr) vsprintf(buffer,format, argptr)
#if defined(__VISUALC__)
#pragma message("Using sprintf() because no snprintf()-like function defined")
#elif defined(__GNUG__) && !defined(__UNIX__)
#warning "Using sprintf() because no snprintf()-like function defined"
#elif defined(__MWERKS__)
#warning "Using sprintf() because no snprintf()-like function defined"
#endif //compiler
#endif // no vsnprintf
#ifdef _AIX
// AIX has vsnprintf, but there's no prototype in the system headers.
extern "C" int vsnprintf(char* str, size_t n, const char* format, va_list ap);
#endif
// ----------------------------------------------------------------------------
// global functions
// ----------------------------------------------------------------------------
#ifdef wxSTD_STRING_COMPATIBILITY
// MS Visual C++ version 5.0 provides the new STL headers as well as the old
// iostream ones.
//
// ATTN: you can _not_ use both of these in the same program!
istream& operator>>(istream& is, wxString& WXUNUSED(str))
{
#if 0
int w = is.width(0);
if ( is.ipfx(0) ) {
streambuf *sb = is.rdbuf();
str.erase();
while ( true ) {
int ch = sb->sbumpc ();
if ( ch == EOF ) {
is.setstate(ios::eofbit);
break;
}
else if ( isspace(ch) ) {
sb->sungetc();
break;
}
str += ch;
if ( --w == 1 )
break;
}
}
is.isfx();
if ( str.length() == 0 )
is.setstate(ios::failbit);
#endif
return is;
}
#endif //std::string compatibility
// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------
// this small class is used to gather statistics for performance tuning
//#define WXSTRING_STATISTICS
#ifdef WXSTRING_STATISTICS
class Averager
{
public:
Averager(const char *sz) { m_sz = sz; m_nTotal = m_nCount = 0; }
~Averager()
{ printf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); }
void Add(size_t n) { m_nTotal += n; m_nCount++; }
private:
size_t m_nCount, m_nTotal;
const char *m_sz;
} g_averageLength("allocation size"),
g_averageSummandLength("summand length"),
g_averageConcatHit("hit probability in concat"),
g_averageInitialLength("initial string length");
#define STATISTICS_ADD(av, val) g_average##av.Add(val)
#else
#define STATISTICS_ADD(av, val)
#endif // WXSTRING_STATISTICS
// ===========================================================================
// wxString class core
// ===========================================================================
// ---------------------------------------------------------------------------
// construction
// ---------------------------------------------------------------------------
// constructs string of <nLength> copies of character <ch>
wxString::wxString(wxChar ch, size_t nLength)
{
Init();
if ( nLength > 0 ) {
AllocBuffer(nLength);
#if wxUSE_UNICODE
// memset only works on char
for (size_t n=0; n<nLength; n++) m_pchData[n] = ch;
#else
memset(m_pchData, ch, nLength);
#endif
}
}
// takes nLength elements of psz starting at nPos
void wxString::InitWith(const wxChar *psz, size_t nPos, size_t nLength)
{
Init();
wxASSERT( nPos <= wxStrlen(psz) );
if ( nLength == wxSTRING_MAXLEN )
nLength = wxStrlen(psz + nPos);
STATISTICS_ADD(InitialLength, nLength);
if ( nLength > 0 ) {
// trailing '\0' is written in AllocBuffer()
AllocBuffer(nLength);
memcpy(m_pchData, psz + nPos, nLength*sizeof(wxChar));
}
}
#ifdef wxSTD_STRING_COMPATIBILITY
// poor man's iterators are "void *" pointers
wxString::wxString(const void *pStart, const void *pEnd)
{
InitWith((const wxChar *)pStart, 0,
(const wxChar *)pEnd - (const wxChar *)pStart);
}
#endif //std::string compatibility
#if wxUSE_UNICODE
// from multibyte string
wxString::wxString(const char *psz, wxMBConvv& conv, size_t nLength)
{
// first get necessary size
size_t nLen = conv.MB2WC((wchar_t *) NULL, psz, 0);
// nLength is number of *Unicode* characters here!
if (nLen > nLength)
nLen = nLength;
// empty?
if ( nLen != 0 ) {
AllocBuffer(nLen);
conv.MB2WC(m_pchData, psz, nLen);
}
else {
Init();
}
}
#else
// from wide string
wxString::wxString(const wchar_t *pwz)
{
// first get necessary size
size_t nLen = wxWC2MB((char *) NULL, pwz, 0);
// empty?
if ( nLen != 0 ) {
AllocBuffer(nLen);
wxWC2MB(m_pchData, pwz, nLen);
}
else {
Init();
}
}
#endif
// ---------------------------------------------------------------------------
// memory allocation
// ---------------------------------------------------------------------------
// allocates memory needed to store a C string of length nLen
void wxString::AllocBuffer(size_t nLen)
{
wxASSERT( nLen > 0 ); //
wxASSERT( nLen <= INT_MAX-1 ); // max size (enough room for 1 extra)
STATISTICS_ADD(Length, nLen);
// allocate memory:
// 1) one extra character for '\0' termination
// 2) sizeof(wxStringData) for housekeeping info
wxStringData* pData = (wxStringData*)
malloc(sizeof(wxStringData) + (nLen + EXTRA_ALLOC + 1)*sizeof(wxChar));
pData->nRefs = 1;
pData->nDataLength = nLen;
pData->nAllocLength = nLen + EXTRA_ALLOC;
m_pchData = pData->data(); // data starts after wxStringData
m_pchData[nLen] = _T('\0');
}
// must be called before changing this string
void wxString::CopyBeforeWrite()
{
wxStringData* pData = GetStringData();
if ( pData->IsShared() ) {
pData->Unlock(); // memory not freed because shared
size_t nLen = pData->nDataLength;
AllocBuffer(nLen);
memcpy(m_pchData, pData->data(), nLen*sizeof(wxChar));
}
wxASSERT( !GetStringData()->IsShared() ); // we must be the only owner
}
// must be called before replacing contents of this string
void wxString::AllocBeforeWrite(size_t nLen)
{
wxASSERT( nLen != 0 ); // doesn't make any sense
// must not share string and must have enough space
wxStringData* pData = GetStringData();
if ( pData->IsShared() || (nLen > pData->nAllocLength) ) {
// can't work with old buffer, get new one
pData->Unlock();
AllocBuffer(nLen);
}
else {
// update the string length
pData->nDataLength = nLen;
}
wxASSERT( !GetStringData()->IsShared() ); // we must be the only owner
}
// allocate enough memory for nLen characters
void wxString::Alloc(size_t nLen)
{
wxStringData *pData = GetStringData();
if ( pData->nAllocLength <= nLen ) {
if ( pData->IsEmpty() ) {
nLen += EXTRA_ALLOC;
wxStringData* pData = (wxStringData*)
malloc(sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
pData->nRefs = 1;
pData->nDataLength = 0;
pData->nAllocLength = nLen;
m_pchData = pData->data(); // data starts after wxStringData
m_pchData[0u] = _T('\0');
}
else if ( pData->IsShared() ) {
pData->Unlock(); // memory not freed because shared
size_t nOldLen = pData->nDataLength;
AllocBuffer(nLen);
memcpy(m_pchData, pData->data(), nOldLen*sizeof(wxChar));
}
else {
nLen += EXTRA_ALLOC;
wxStringData *p = (wxStringData *)
realloc(pData, sizeof(wxStringData) + (nLen + 1)*sizeof(wxChar));
if ( p == NULL ) {
// @@@ what to do on memory error?
return;
}
// it's not important if the pointer changed or not (the check for this
// is not faster than assigning to m_pchData in all cases)
p->nAllocLength = nLen;
m_pchData = p->data();
}
}
//else: we've already got enough
}
// shrink to minimal size (releasing extra memory)
void wxString::Shrink()
{
wxStringData *pData = GetStringData();
// this variable is unused in release build, so avoid the compiler warning by
// just not declaring it
#ifdef __WXDEBUG__
void *p =
#endif
realloc(pData, sizeof(wxStringData) + (pData->nDataLength + 1)*sizeof(wxChar));
wxASSERT( p != NULL ); // can't free memory?
wxASSERT( p == pData ); // we're decrementing the size - block shouldn't move!
}
// get the pointer to writable buffer of (at least) nLen bytes
wxChar *wxString::GetWriteBuf(size_t nLen)
{
AllocBeforeWrite(nLen);
wxASSERT( GetStringData()->nRefs == 1 );
GetStringData()->Validate(FALSE);
return m_pchData;
}
// put string back in a reasonable state after GetWriteBuf
void wxString::UngetWriteBuf()
{
GetStringData()->nDataLength = wxStrlen(m_pchData);
GetStringData()->Validate(TRUE);
}
// ---------------------------------------------------------------------------
// data access
// ---------------------------------------------------------------------------
// all functions are inline in string.h
// ---------------------------------------------------------------------------
// assignment operators
// ---------------------------------------------------------------------------
// helper function: does real copy
void wxString::AssignCopy(size_t nSrcLen, const wxChar *pszSrcData)
{
if ( nSrcLen == 0 ) {
Reinit();
}
else {
AllocBeforeWrite(nSrcLen);
memcpy(m_pchData, pszSrcData, nSrcLen*sizeof(wxChar));
GetStringData()->nDataLength = nSrcLen;
m_pchData[nSrcLen] = _T('\0');
}
}
// assigns one string to another
wxString& wxString::operator=(const wxString& stringSrc)
{
wxASSERT( stringSrc.GetStringData()->IsValid() );
// don't copy string over itself
if ( m_pchData != stringSrc.m_pchData ) {
if ( stringSrc.GetStringData()->IsEmpty() ) {
Reinit();
}
else {
// adjust references
GetStringData()->Unlock();
m_pchData = stringSrc.m_pchData;
GetStringData()->Lock();
}
}
return *this;
}
// assigns a single character
wxString& wxString::operator=(wxChar ch)
{
AssignCopy(1, &ch);
return *this;
}
// assigns C string
wxString& wxString::operator=(const wxChar *psz)
{
AssignCopy(wxStrlen(psz), psz);
return *this;
}
#if !wxUSE_UNICODE
// same as 'signed char' variant
wxString& wxString::operator=(const unsigned char* psz)
{
*this = (const char *)psz;
return *this;
}
wxString& wxString::operator=(const wchar_t *pwz)
{
wxString str(pwz);
*this = str;
return *this;
}
#endif
// ---------------------------------------------------------------------------
// string concatenation
// ---------------------------------------------------------------------------
// add something to this string
void wxString::ConcatSelf(int nSrcLen, const wxChar *pszSrcData)
{
STATISTICS_ADD(SummandLength, nSrcLen);
// concatenating an empty string is a NOP
if ( nSrcLen > 0 ) {
wxStringData *pData = GetStringData();
size_t nLen = pData->nDataLength;
size_t nNewLen = nLen + nSrcLen;
// alloc new buffer if current is too small
if ( pData->IsShared() ) {
STATISTICS_ADD(ConcatHit, 0);
// we have to allocate another buffer
wxStringData* pOldData = GetStringData();
AllocBuffer(nNewLen);
memcpy(m_pchData, pOldData->data(), nLen*sizeof(wxChar));
pOldData->Unlock();
}
else if ( nNewLen > pData->nAllocLength ) {
STATISTICS_ADD(ConcatHit, 0);
// we have to grow the buffer
Alloc(nNewLen);
}
else {
STATISTICS_ADD(ConcatHit, 1);
// the buffer is already big enough
}
// should be enough space
wxASSERT( nNewLen <= GetStringData()->nAllocLength );
// fast concatenation - all is done in our buffer
memcpy(m_pchData + nLen, pszSrcData, nSrcLen*sizeof(wxChar));
m_pchData[nNewLen] = _T('\0'); // put terminating '\0'
GetStringData()->nDataLength = nNewLen; // and fix the length
}
//else: the string to append was empty
}
/*
* concatenation functions come in 5 flavours:
* string + string
* char + string and string + char
* C str + string and string + C str
*/
wxString operator+(const wxString& string1, const wxString& string2)
{
wxASSERT( string1.GetStringData()->IsValid() );
wxASSERT( string2.GetStringData()->IsValid() );
wxString s = string1;
s += string2;
return s;
}
wxString operator+(const wxString& string, wxChar ch)
{
wxASSERT( string.GetStringData()->IsValid() );
wxString s = string;
s += ch;
return s;
}
wxString operator+(wxChar ch, const wxString& string)
{
wxASSERT( string.GetStringData()->IsValid() );
wxString s = ch;
s += string;
return s;
}
wxString operator+(const wxString& string, const wxChar *psz)
{
wxASSERT( string.GetStringData()->IsValid() );
wxString s;
s.Alloc(wxStrlen(psz) + string.Len());
s = string;
s += psz;
return s;
}
wxString operator+(const wxChar *psz, const wxString& string)
{
wxASSERT( string.GetStringData()->IsValid() );
wxString s;
s.Alloc(wxStrlen(psz) + string.Len());
s = psz;
s += string;
return s;
}
// ===========================================================================
// other common string functions
// ===========================================================================
// ---------------------------------------------------------------------------
// simple sub-string extraction
// ---------------------------------------------------------------------------
// helper function: clone the data attached to this string
void wxString::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const
{
if ( nCopyLen == 0 ) {
dest.Init();
}
else {
dest.AllocBuffer(nCopyLen);
memcpy(dest.m_pchData, m_pchData + nCopyIndex, nCopyLen*sizeof(wxChar));
}
}
// extract string of length nCount starting at nFirst
wxString wxString::Mid(size_t nFirst, size_t nCount) const
{
wxStringData *pData = GetStringData();
size_t nLen = pData->nDataLength;
// default value of nCount is wxSTRING_MAXLEN and means "till the end"
if ( nCount == wxSTRING_MAXLEN )
{
nCount = nLen - nFirst;
}
// out-of-bounds requests return sensible things
if ( nFirst + nCount > nLen )
{
nCount = nLen - nFirst;
}
if ( nFirst > nLen )
{
// AllocCopy() will return empty string
nCount = 0;
}
wxString dest;
AllocCopy(dest, nCount, nFirst);
return dest;
}
// extract nCount last (rightmost) characters
wxString wxString::Right(size_t nCount) const
{
if ( nCount > (size_t)GetStringData()->nDataLength )
nCount = GetStringData()->nDataLength;
wxString dest;
AllocCopy(dest, nCount, GetStringData()->nDataLength - nCount);
return dest;
}
// get all characters after the last occurence of ch
// (returns the whole string if ch not found)
wxString wxString::AfterLast(wxChar ch) const
{
wxString str;
int iPos = Find(ch, TRUE);
if ( iPos == wxNOT_FOUND )
str = *this;
else
str = c_str() + iPos + 1;
return str;
}
// extract nCount first (leftmost) characters
wxString wxString::Left(size_t nCount) const
{
if ( nCount > (size_t)GetStringData()->nDataLength )
nCount = GetStringData()->nDataLength;
wxString dest;
AllocCopy(dest, nCount, 0);
return dest;
}
// get all characters before the first occurence of ch
// (returns the whole string if ch not found)
wxString wxString::BeforeFirst(wxChar ch) const
{
wxString str;
for ( const wxChar *pc = m_pchData; *pc != _T('\0') && *pc != ch; pc++ )
str += *pc;
return str;
}
/// get all characters before the last occurence of ch
/// (returns empty string if ch not found)
wxString wxString::BeforeLast(wxChar ch) const
{
wxString str;
int iPos = Find(ch, TRUE);
if ( iPos != wxNOT_FOUND && iPos != 0 )
str = wxString(c_str(), iPos);
return str;
}
/// get all characters after the first occurence of ch
/// (returns empty string if ch not found)
wxString wxString::AfterFirst(wxChar ch) const
{
wxString str;
int iPos = Find(ch);
if ( iPos != wxNOT_FOUND )
str = c_str() + iPos + 1;
return str;
}
// replace first (or all) occurences of some substring with another one
size_t wxString::Replace(const wxChar *szOld, const wxChar *szNew, bool bReplaceAll)
{
size_t uiCount = 0; // count of replacements made
size_t uiOldLen = wxStrlen(szOld);
wxString strTemp;
const wxChar *pCurrent = m_pchData;
const wxChar *pSubstr;
while ( *pCurrent != _T('\0') ) {
pSubstr = wxStrstr(pCurrent, szOld);
if ( pSubstr == NULL ) {
// strTemp is unused if no replacements were made, so avoid the copy
if ( uiCount == 0 )
return 0;
strTemp += pCurrent; // copy the rest
break; // exit the loop
}
else {
// take chars before match
strTemp.ConcatSelf(pSubstr - pCurrent, pCurrent);
strTemp += szNew;
pCurrent = pSubstr + uiOldLen; // restart after match
uiCount++;
// stop now?
if ( !bReplaceAll ) {
strTemp += pCurrent; // copy the rest
break; // exit the loop
}
}
}
// only done if there were replacements, otherwise would have returned above
*this = strTemp;
return uiCount;
}
bool wxString::IsAscii() const
{
const wxChar *s = (const wxChar*) *this;
while(*s){
if(!isascii(*s)) return(FALSE);
s++;
}
return(TRUE);
}
bool wxString::IsWord() const
{
const wxChar *s = (const wxChar*) *this;
while(*s){
if(!wxIsalpha(*s)) return(FALSE);
s++;
}
return(TRUE);
}
bool wxString::IsNumber() const
{
const wxChar *s = (const wxChar*) *this;
while(*s){
if(!wxIsdigit(*s)) return(FALSE);
s++;
}
return(TRUE);
}
wxString wxString::Strip(stripType w) const
{
wxString s = *this;
if ( w & leading ) s.Trim(FALSE);
if ( w & trailing ) s.Trim(TRUE);
return s;
}
// ---------------------------------------------------------------------------
// case conversion
// ---------------------------------------------------------------------------
wxString& wxString::MakeUpper()
{
CopyBeforeWrite();
for ( wxChar *p = m_pchData; *p; p++ )
*p = (wxChar)wxToupper(*p);
return *this;
}
wxString& wxString::MakeLower()
{
CopyBeforeWrite();
for ( wxChar *p = m_pchData; *p; p++ )
*p = (wxChar)wxTolower(*p);
return *this;
}
// ---------------------------------------------------------------------------
// trimming and padding
// ---------------------------------------------------------------------------
// trims spaces (in the sense of isspace) from left or right side
wxString& wxString::Trim(bool bFromRight)
{
// first check if we're going to modify the string at all
if ( !IsEmpty() &&
(
(bFromRight && wxIsspace(GetChar(Len() - 1))) ||
(!bFromRight && wxIsspace(GetChar(0u)))
)
)
{
// ok, there is at least one space to trim
CopyBeforeWrite();
if ( bFromRight )
{
// find last non-space character
wxChar *psz = m_pchData + GetStringData()->nDataLength - 1;
while ( wxIsspace(*psz) && (psz >= m_pchData) )
psz--;
// truncate at trailing space start
*++psz = _T('\0');
GetStringData()->nDataLength = psz - m_pchData;
}
else
{
// find first non-space character
const wxChar *psz = m_pchData;
while ( wxIsspace(*psz) )
psz++;
// fix up data and length
int nDataLength = GetStringData()->nDataLength - (psz - (const wxChar*) m_pchData);
memmove(m_pchData, psz, (nDataLength + 1)*sizeof(wxChar));
GetStringData()->nDataLength = nDataLength;
}
}
return *this;
}
// adds nCount characters chPad to the string from either side
wxString& wxString::Pad(size_t nCount, wxChar chPad, bool bFromRight)
{
wxString s(chPad, nCount);
if ( bFromRight )
*this += s;
else
{
s += *this;
*this = s;
}
return *this;
}
// truncate the string
wxString& wxString::Truncate(size_t uiLen)
{
if ( uiLen < Len() ) {
CopyBeforeWrite();
*(m_pchData + uiLen) = _T('\0');
GetStringData()->nDataLength = uiLen;
}
//else: nothing to do, string is already short enough
return *this;
}
// ---------------------------------------------------------------------------
// finding (return wxNOT_FOUND if not found and index otherwise)
// ---------------------------------------------------------------------------
// find a character
int wxString::Find(wxChar ch, bool bFromEnd) const
{
const wxChar *psz = bFromEnd ? wxStrrchr(m_pchData, ch) : wxStrchr(m_pchData, ch);
return (psz == NULL) ? wxNOT_FOUND : psz - (const wxChar*) m_pchData;
}
// find a sub-string (like strstr)
int wxString::Find(const wxChar *pszSub) const
{
const wxChar *psz = wxStrstr(m_pchData, pszSub);
return (psz == NULL) ? wxNOT_FOUND : psz - (const wxChar*) m_pchData;
}
// ---------------------------------------------------------------------------
// stream-like operators
// ---------------------------------------------------------------------------
wxString& wxString::operator<<(int i)
{
wxString res;
res.Printf(_T("%d"), i);
return (*this) << res;
}
wxString& wxString::operator<<(float f)
{
wxString res;
res.Printf(_T("%f"), f);
return (*this) << res;
}
wxString& wxString::operator<<(double d)
{
wxString res;
res.Printf(_T("%g"), d);
return (*this) << res;
}
// ---------------------------------------------------------------------------
// formatted output
// ---------------------------------------------------------------------------
int wxString::Printf(const wxChar *pszFormat, ...)
{
va_list argptr;
va_start(argptr, pszFormat);
int iLen = PrintfV(pszFormat, argptr);
va_end(argptr);
return iLen;
}
int wxString::PrintfV(const wxChar* pszFormat, va_list argptr)
{
// static buffer to avoid dynamic memory allocation each time
static char s_szScratch[1024];
#if wxUSE_THREADS
// protect the static buffer
static wxCriticalSection critsect;
wxCriticalSectionLocker lock(critsect);
#endif
#if 1 // the new implementation
Reinit();
for (size_t n = 0; pszFormat[n]; n++)
if (pszFormat[n] == _T('%')) {
static char s_szFlags[256] = "%";
size_t flagofs = 1;
bool adj_left = FALSE, in_prec = FALSE,
prec_dot = FALSE, done = FALSE;
int ilen = 0;
size_t min_width = 0, max_width = wxSTRING_MAXLEN;
do {
#define CHECK_PREC if (in_prec && !prec_dot) { s_szFlags[flagofs++] = '.'; prec_dot = TRUE; }
switch (pszFormat[++n]) {
case _T('\0'):
done = TRUE;
break;
case _T('%'):
*this += _T('%');
done = TRUE;
break;
case _T('#'):
case _T('0'):
case _T(' '):
case _T('+'):
case _T('\''):
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
break;
case _T('-'):
CHECK_PREC
adj_left = TRUE;
s_szFlags[flagofs++] = pszFormat[n];
break;
case _T('.'):
CHECK_PREC
in_prec = TRUE;
prec_dot = FALSE;
max_width = 0;
// dot will be auto-added to s_szFlags if non-negative number follows
break;
case _T('h'):
ilen = -1;
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
break;
case _T('l'):
ilen = 1;
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
break;
case _T('q'):
case _T('L'):
ilen = 2;
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
break;
case _T('Z'):
ilen = 3;
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
break;
case _T('*'):
{
int len = va_arg(argptr, int);
if (in_prec) {
if (len<0) break;
CHECK_PREC
max_width = len;
} else {
if (len<0) {
adj_left = !adj_left;
s_szFlags[flagofs++] = '-';
len = -len;
}
min_width = len;
}
flagofs += ::sprintf(s_szFlags+flagofs,"%d",len);
}
break;
case _T('1'): case _T('2'): case _T('3'):
case _T('4'): case _T('5'): case _T('6'):
case _T('7'): case _T('8'): case _T('9'):
{
int len = 0;
CHECK_PREC
while ((pszFormat[n]>=_T('0')) && (pszFormat[n]<=_T('9'))) {
s_szFlags[flagofs++] = pszFormat[n];
len = len*10 + (pszFormat[n] - _T('0'));
n++;
}
if (in_prec) max_width = len;
else min_width = len;
n--; // the main loop pre-increments n again
}
break;
case _T('d'):
case _T('i'):
case _T('o'):
case _T('u'):
case _T('x'):
case _T('X'):
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
s_szFlags[flagofs] = '\0';
if (ilen == 0 ) {
int val = va_arg(argptr, int);
::sprintf(s_szScratch, s_szFlags, val);
}
else if (ilen == -1) {
short int val = va_arg(argptr, short int);
::sprintf(s_szScratch, s_szFlags, val);
}
else if (ilen == 1) {
long int val = va_arg(argptr, long int);
::sprintf(s_szScratch, s_szFlags, val);
}
else if (ilen == 2) {
#if SIZEOF_LONG_LONG
long long int val = va_arg(argptr, long long int);
::sprintf(s_szScratch, s_szFlags, val);
#else
long int val = va_arg(argptr, long int);
::sprintf(s_szScratch, s_szFlags, val);
#endif
}
else if (ilen == 3) {
size_t val = va_arg(argptr, size_t);
::sprintf(s_szScratch, s_szFlags, val);
}
*this += wxString(s_szScratch);
done = TRUE;
break;
case _T('e'):
case _T('E'):
case _T('f'):
case _T('g'):
case _T('G'):
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
s_szFlags[flagofs] = '\0';
if (ilen == 2) {
long double val = va_arg(argptr, long double);
::sprintf(s_szScratch, s_szFlags, val);
} else {
double val = va_arg(argptr, double);
::sprintf(s_szScratch, s_szFlags, val);
}
*this += wxString(s_szScratch);
done = TRUE;
break;
case _T('p'):
{
void *val = va_arg(argptr, void *);
CHECK_PREC
s_szFlags[flagofs++] = pszFormat[n];
s_szFlags[flagofs] = '\0';
::sprintf(s_szScratch, s_szFlags, val);
*this += wxString(s_szScratch);
done = TRUE;
}
break;
case _T('c'):
{
wxChar val = va_arg(argptr, int);
// we don't need to honor padding here, do we?
*this += val;
done = TRUE;
}
break;
case _T('s'):
if (ilen == -1) {
// wx extension: we'll let %hs mean non-Unicode strings
char *val = va_arg(argptr, char *);
#if wxUSE_UNICODE
// ASCII->Unicode constructor handles max_width right
wxString s(val, max_width);
#else
size_t len = wxSTRING_MAXLEN;
if (val) {
for (len = 0; val[len] && (len<max_width); len++);
} else val = _T("(null)");
wxString s(val, len);
#endif
if (s.Len() < min_width)
s.Pad(min_width - s.Len(), _T(' '), adj_left);
*this += s;
} else {
wxChar *val = va_arg(argptr, wxChar *);
size_t len = wxSTRING_MAXLEN;
if (val) {
for (len = 0; val[len] && (len<max_width); len++);
} else val = _T("(null)");
wxString s(val, len);
if (s.Len() < min_width)
s.Pad(min_width - s.Len(), _T(' '), adj_left);
*this += s;
done = TRUE;
}
break;
case _T('n'):
if (ilen == 0) {
int *val = va_arg(argptr, int *);
*val = Len();
}
else if (ilen == -1) {
short int *val = va_arg(argptr, short int *);
*val = Len();
}
else if (ilen >= 1) {
long int *val = va_arg(argptr, long int *);
*val = Len();
}
done = TRUE;
break;
default:
if (wxIsalpha(pszFormat[n]))
// probably some flag not taken care of here yet
s_szFlags[flagofs++] = pszFormat[n];
else {
// bad format
*this += _T('%'); // just to pass the glibc tst-printf.c
n--;
done = TRUE;
}
break;
}
#undef CHECK_PREC
} while (!done);
} else *this += pszFormat[n];
#else
// NB: wxVsnprintf() may return either less than the buffer size or -1 if there
// is not enough place depending on implementation
int iLen = wxVsnprintf(s_szScratch, WXSIZEOF(s_szScratch), pszFormat, argptr);
char *buffer;
if ( iLen < (int)WXSIZEOF(s_szScratch) ) {
buffer = s_szScratch;
}
else {
int size = WXSIZEOF(s_szScratch) * 2;
buffer = (char *)malloc(size);
while ( buffer != NULL ) {
iLen = wxVsnprintf(buffer, WXSIZEOF(s_szScratch), pszFormat, argptr);
if ( iLen < size ) {
// ok, there was enough space
break;
}
// still not enough, double it again
buffer = (char *)realloc(buffer, size *= 2);
}
if ( !buffer ) {
// out of memory
return -1;
}
}
wxString s(buffer);
*this = s;
if ( buffer != s_szScratch )
free(buffer);
#endif
return Len();
}
// ----------------------------------------------------------------------------
// misc other operations
// ----------------------------------------------------------------------------
bool wxString::Matches(const wxChar *pszMask) const
{
// check char by char
const wxChar *pszTxt;
for ( pszTxt = c_str(); *pszMask != _T('\0'); pszMask++, pszTxt++ ) {
switch ( *pszMask ) {
case _T('?'):
if ( *pszTxt == _T('\0') )
return FALSE;
pszTxt++;
pszMask++;
break;
case _T('*'):
{
// ignore special chars immediately following this one
while ( *pszMask == _T('*') || *pszMask == _T('?') )
pszMask++;
// if there is nothing more, match
if ( *pszMask == _T('\0') )
return TRUE;
// are there any other metacharacters in the mask?
size_t uiLenMask;
const wxChar *pEndMask = wxStrpbrk(pszMask, _T("*?"));
if ( pEndMask != NULL ) {
// we have to match the string between two metachars
uiLenMask = pEndMask - pszMask;
}
else {
// we have to match the remainder of the string
uiLenMask = wxStrlen(pszMask);
}
wxString strToMatch(pszMask, uiLenMask);
const wxChar* pMatch = wxStrstr(pszTxt, strToMatch);
if ( pMatch == NULL )
return FALSE;
// -1 to compensate "++" in the loop
pszTxt = pMatch + uiLenMask - 1;
pszMask += uiLenMask - 1;
}
break;
default:
if ( *pszMask != *pszTxt )
return FALSE;
break;
}
}
// match only if nothing left
return *pszTxt == _T('\0');
}
// Count the number of chars
int wxString::Freq(wxChar ch) const
{
int count = 0;
int len = Len();
for (int i = 0; i < len; i++)
{
if (GetChar(i) == ch)
count ++;
}
return count;
}
// convert to upper case, return the copy of the string
wxString wxString::Upper() const
{ wxString s(*this); return s.MakeUpper(); }
// convert to lower case, return the copy of the string
wxString wxString::Lower() const { wxString s(*this); return s.MakeLower(); }
int wxString::sprintf(const wxChar *pszFormat, ...)
{
va_list argptr;
va_start(argptr, pszFormat);
int iLen = PrintfV(pszFormat, argptr);
va_end(argptr);
return iLen;
}
// ---------------------------------------------------------------------------
// standard C++ library string functions
// ---------------------------------------------------------------------------
#ifdef wxSTD_STRING_COMPATIBILITY
wxString& wxString::insert(size_t nPos, const wxString& str)
{
wxASSERT( str.GetStringData()->IsValid() );
wxASSERT( nPos <= Len() );
if ( !str.IsEmpty() ) {
wxString strTmp;
wxChar *pc = strTmp.GetWriteBuf(Len() + str.Len());
wxStrncpy(pc, c_str(), nPos);
wxStrcpy(pc + nPos, str);
wxStrcpy(pc + nPos + str.Len(), c_str() + nPos);
strTmp.UngetWriteBuf();
*this = strTmp;
}
return *this;
}
size_t wxString::find(const wxString& str, size_t nStart) const
{
wxASSERT( str.GetStringData()->IsValid() );
wxASSERT( nStart <= Len() );
const wxChar *p = wxStrstr(c_str() + nStart, str);
return p == NULL ? npos : p - c_str();
}
// VC++ 1.5 can't cope with the default argument in the header.
#if !defined(__VISUALC__) || defined(__WIN32__)
size_t wxString::find(const wxChar* sz, size_t nStart, size_t n) const
{
return find(wxString(sz, n == npos ? 0 : n), nStart);
}
#endif // VC++ 1.5
// Gives a duplicate symbol (presumably a case-insensitivity problem)
#if !defined(__BORLANDC__)
size_t wxString::find(wxChar ch, size_t nStart) const
{
wxASSERT( nStart <= Len() );
const wxChar *p = wxStrchr(c_str() + nStart, ch);
return p == NULL ? npos : p - c_str();
}
#endif
size_t wxString::rfind(const wxString& str, size_t nStart) const
{
wxASSERT( str.GetStringData()->IsValid() );
wxASSERT( nStart <= Len() );
// # could be quicker than that
const wxChar *p = c_str() + (nStart == npos ? Len() : nStart);
while ( p >= c_str() + str.Len() ) {
if ( wxStrncmp(p - str.Len(), str, str.Len()) == 0 )
return p - str.Len() - c_str();
p--;
}
return npos;
}
// VC++ 1.5 can't cope with the default argument in the header.
#if !defined(__VISUALC__) || defined(__WIN32__)
size_t wxString::rfind(const wxChar* sz, size_t nStart, size_t n) const
{
return rfind(wxString(sz, n == npos ? 0 : n), nStart);
}
size_t wxString::rfind(wxChar ch, size_t nStart) const
{
wxASSERT( nStart <= Len() );
const wxChar *p = wxStrrchr(c_str() + nStart, ch);
return p == NULL ? npos : p - c_str();
}
#endif // VC++ 1.5
wxString wxString::substr(size_t nStart, size_t nLen) const
{
// npos means 'take all'
if ( nLen == npos )
nLen = 0;
wxASSERT( nStart + nLen <= Len() );
return wxString(c_str() + nStart, nLen == npos ? 0 : nLen);
}
wxString& wxString::erase(size_t nStart, size_t nLen)
{
wxString strTmp(c_str(), nStart);
if ( nLen != npos ) {
wxASSERT( nStart + nLen <= Len() );
strTmp.append(c_str() + nStart + nLen);
}
*this = strTmp;
return *this;
}
wxString& wxString::replace(size_t nStart, size_t nLen, const wxChar *sz)
{
wxASSERT( nStart + nLen <= wxStrlen(sz) );
wxString strTmp;
if ( nStart != 0 )
strTmp.append(c_str(), nStart);
strTmp += sz;
strTmp.append(c_str() + nStart + nLen);
*this = strTmp;
return *this;
}
wxString& wxString::replace(size_t nStart, size_t nLen, size_t nCount, wxChar ch)
{
return replace(nStart, nLen, wxString(ch, nCount));
}
wxString& wxString::replace(size_t nStart, size_t nLen,
const wxString& str, size_t nStart2, size_t nLen2)
{
return replace(nStart, nLen, str.substr(nStart2, nLen2));
}
wxString& wxString::replace(size_t nStart, size_t nLen,
const wxChar* sz, size_t nCount)
{
return replace(nStart, nLen, wxString(sz, nCount));
}
#endif //std::string compatibility
// ============================================================================
// ArrayString
// ============================================================================
// size increment = max(50% of current size, ARRAY_MAXSIZE_INCREMENT)
#define ARRAY_MAXSIZE_INCREMENT 4096
#ifndef ARRAY_DEFAULT_INITIAL_SIZE // also defined in dynarray.h
#define ARRAY_DEFAULT_INITIAL_SIZE (16)
#endif
#define STRING(p) ((wxString *)(&(p)))
// ctor
wxArrayString::wxArrayString()
{
m_nSize =
m_nCount = 0;
m_pItems = (wxChar **) NULL;
}
// copy ctor
wxArrayString::wxArrayString(const wxArrayString& src)
{
m_nSize =
m_nCount = 0;
m_pItems = (wxChar **) NULL;
*this = src;
}
// assignment operator
wxArrayString& wxArrayString::operator=(const wxArrayString& src)
{
if ( m_nSize > 0 )
Clear();
if ( src.m_nCount > ARRAY_DEFAULT_INITIAL_SIZE )
Alloc(src.m_nCount);
// we can't just copy the pointers here because otherwise we would share
// the strings with another array
for ( size_t n = 0; n < src.m_nCount; n++ )
Add(src[n]);
if ( m_nCount != 0 )
memcpy(m_pItems, src.m_pItems, m_nCount*sizeof(wxChar *));
return *this;
}
// grow the array
void wxArrayString::Grow()
{
// only do it if no more place
if( m_nCount == m_nSize ) {
if( m_nSize == 0 ) {
// was empty, alloc some memory
m_nSize = ARRAY_DEFAULT_INITIAL_SIZE;
m_pItems = new wxChar *[m_nSize];
}
else {
// otherwise when it's called for the first time, nIncrement would be 0
// and the array would never be expanded
wxASSERT( ARRAY_DEFAULT_INITIAL_SIZE != 0 );
// add 50% but not too much
size_t nIncrement = m_nSize < ARRAY_DEFAULT_INITIAL_SIZE
? ARRAY_DEFAULT_INITIAL_SIZE : m_nSize >> 1;
if ( nIncrement > ARRAY_MAXSIZE_INCREMENT )
nIncrement = ARRAY_MAXSIZE_INCREMENT;
m_nSize += nIncrement;
wxChar **pNew = new wxChar *[m_nSize];
// copy data to new location
memcpy(pNew, m_pItems, m_nCount*sizeof(wxChar *));
// delete old memory (but do not release the strings!)
wxDELETEA(m_pItems);
m_pItems = pNew;
}
}
}
void wxArrayString::Free()
{
for ( size_t n = 0; n < m_nCount; n++ ) {
STRING(m_pItems[n])->GetStringData()->Unlock();
}
}
// deletes all the strings from the list
void wxArrayString::Empty()
{
Free();
m_nCount = 0;
}
// as Empty, but also frees memory
void wxArrayString::Clear()
{
Free();
m_nSize =
m_nCount = 0;
wxDELETEA(m_pItems);
}
// dtor
wxArrayString::~wxArrayString()
{
Free();
wxDELETEA(m_pItems);
}
// pre-allocates memory (frees the previous data!)
void wxArrayString::Alloc(size_t nSize)
{
wxASSERT( nSize > 0 );
// only if old buffer was not big enough
if ( nSize > m_nSize ) {
Free();
wxDELETEA(m_pItems);
m_pItems = new wxChar *[nSize];
m_nSize = nSize;
}
m_nCount = 0;
}
// searches the array for an item (forward or backwards)
int wxArrayString::Index(const wxChar *sz, bool bCase, bool bFromEnd) const
{
if ( bFromEnd ) {
if ( m_nCount > 0 ) {
size_t ui = m_nCount;
do {
if ( STRING(m_pItems[--ui])->IsSameAs(sz, bCase) )
return ui;
}
while ( ui != 0 );
}
}
else {
for( size_t ui = 0; ui < m_nCount; ui++ ) {
if( STRING(m_pItems[ui])->IsSameAs(sz, bCase) )
return ui;
}
}
return wxNOT_FOUND;
}
// add item at the end
void wxArrayString::Add(const wxString& str)
{
wxASSERT( str.GetStringData()->IsValid() );
Grow();
// the string data must not be deleted!
str.GetStringData()->Lock();
m_pItems[m_nCount++] = (wxChar *)str.c_str();
}
// add item at the given position
void wxArrayString::Insert(const wxString& str, size_t nIndex)
{
wxASSERT( str.GetStringData()->IsValid() );
wxCHECK_RET( nIndex <= m_nCount, ("bad index in wxArrayString::Insert") );
Grow();
memmove(&m_pItems[nIndex + 1], &m_pItems[nIndex],
(m_nCount - nIndex)*sizeof(wxChar *));
str.GetStringData()->Lock();
m_pItems[nIndex] = (wxChar *)str.c_str();
m_nCount++;
}
// removes item from array (by index)
void wxArrayString::Remove(size_t nIndex)
{
wxCHECK_RET( nIndex <= m_nCount, _("bad index in wxArrayString::Remove") );
// release our lock
Item(nIndex).GetStringData()->Unlock();
memmove(&m_pItems[nIndex], &m_pItems[nIndex + 1],
(m_nCount - nIndex - 1)*sizeof(wxChar *));
m_nCount--;
}
// removes item from array (by value)
void wxArrayString::Remove(const wxChar *sz)
{
int iIndex = Index(sz);
wxCHECK_RET( iIndex != wxNOT_FOUND,
_("removing inexistent element in wxArrayString::Remove") );
Remove(iIndex);
}
// ----------------------------------------------------------------------------
// sorting
// ----------------------------------------------------------------------------
// we can only sort one array at a time with the quick-sort based
// implementation
#if wxUSE_THREADS
// need a critical section to protect access to gs_compareFunction and
// gs_sortAscending variables
static wxCriticalSection *gs_critsectStringSort = NULL;
// call this before the value of the global sort vars is changed/after
// you're finished with them
#define START_SORT() wxASSERT( !gs_critsectStringSort ); \
gs_critsectStringSort = new wxCriticalSection; \
gs_critsectStringSort->Enter()
#define END_SORT() gs_critsectStringSort->Leave(); \
delete gs_critsectStringSort; \
gs_critsectStringSort = NULL
#else // !threads
#define START_SORT()
#define END_SORT()
#endif // wxUSE_THREADS
// function to use for string comparaison
static wxArrayString::CompareFunction gs_compareFunction = NULL;
// if we don't use the compare function, this flag tells us if we sort the
// array in ascending or descending order
static bool gs_sortAscending = TRUE;
// function which is called by quick sort
static int wxStringCompareFunction(const void *first, const void *second)
{
wxString *strFirst = (wxString *)first;
wxString *strSecond = (wxString *)second;
if ( gs_compareFunction ) {
return gs_compareFunction(*strFirst, *strSecond);
}
else {
// maybe we should use wxStrcoll
int result = wxStrcmp(strFirst->c_str(), strSecond->c_str());
return gs_sortAscending ? result : -result;
}
}
// sort array elements using passed comparaison function
void wxArrayString::Sort(CompareFunction compareFunction)
{
START_SORT();
wxASSERT( !gs_compareFunction ); // must have been reset to NULL
gs_compareFunction = compareFunction;
DoSort();
END_SORT();
}
void wxArrayString::Sort(bool reverseOrder)
{
START_SORT();
wxASSERT( !gs_compareFunction ); // must have been reset to NULL
gs_sortAscending = !reverseOrder;
DoSort();
END_SORT();
}
void wxArrayString::DoSort()
{
// just sort the pointers using qsort() - of course it only works because
// wxString() *is* a pointer to its data
qsort(m_pItems, m_nCount, sizeof(wxChar *), wxStringCompareFunction);
}
// ============================================================================
// MBConv
// ============================================================================
WXDLLEXPORT_DATA(wxMBConv) wxConv_libc;
// ----------------------------------------------------------------------------
// standard libc conversion
// ----------------------------------------------------------------------------
size_t wxMBConv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
return wxMB2WC(buf, psz, n);
}
size_t wxMBConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
return wxWC2MB(buf, psz, n);
}
// ----------------------------------------------------------------------------
// UTF-7
// ----------------------------------------------------------------------------
class wxMBConv_UTF7
{
public:
virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
};
// WXDLLEXPORT_DATA(wxMBConv_UTF7) wxConv_UTF7;
WXDLLEXPORT_DATA(wxMBConv) wxConv_UTF7;
// TODO: write actual implementations of UTF-7 here
size_t wxMBConv_UTF7::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
return 0;
}
size_t wxMBConv_UTF7::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
return 0;
}
// ----------------------------------------------------------------------------
// UTF-8
// ----------------------------------------------------------------------------
class wxMBConv_UTF8
{
public:
virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
};
// WXDLLEXPORT_DATA(wxMBConv_UTF8) wxConv_UTF8;
WXDLLEXPORT_DATA(wxMBConv) wxConv_UTF8;
// TODO: write actual implementations of UTF-8 here
size_t wxMBConv_UTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
return wxMB2WC(buf, psz, n);
}
size_t wxMBConv_UTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
return wxWC2MB(buf, psz, n);
}
// ----------------------------------------------------------------------------
// specified character set
// ----------------------------------------------------------------------------
// TODO: write actual implementation of character set conversion here
wxCSConv::wxCSConv(const wxChar *charset)
{
data = (wxChar *) NULL;
}
size_t wxCSConv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
if (buf && !data) {
// latin-1 (direct)
for (size_t c=0; c<=n; c++)
buf[c] = psz[c];
}
return n;
}
size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
if (buf && !data) {
// latin-1 (direct)
for (size_t c=0; c<=n; c++)
buf[c] = (psz[c]>0xff) ? '?' : psz[c];
}
return n;
}
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