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wxWidgets/include/wx/private/wxprintf.h

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/////////////////////////////////////////////////////////////////////////////
// Name: wx/private/wxprintf.h
// Purpose: wxWidgets wxPrintf() implementation
// Author: Ove Kaven
// Modified by: Ron Lee, Francesco Montorsi
// Created: 09/04/99
// RCS-ID: $Id$
// Copyright: (c) wxWidgets copyright
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_PRIVATE_WXPRINTF_H_
#define _WX_PRIVATE_WXPRINTF_H_
// ---------------------------------------------------------------------------
// headers and macros
// ---------------------------------------------------------------------------
#include "wx/crt.h"
#include <string.h>
#if defined(__MWERKS__) && __MSL__ >= 0x6000
namespace std {}
using namespace std ;
#endif
// prefer snprintf over sprintf
#if defined(__VISUALC__) || \
(defined(__BORLANDC__) && __BORLANDC__ >= 0x540)
#define system_sprintf(buff, max, flags, data) \
::_snprintf(buff, max, flags, data)
#elif defined(HAVE_SNPRINTF)
#define system_sprintf(buff, max, flags, data) \
::snprintf(buff, max, flags, data)
#else // NB: at least sprintf() should always be available
// since 'max' is not used in this case, wxVsnprintf() should always
// ensure that 'buff' is big enough for all common needs
// (see wxMAX_SVNPRINTF_FLAGBUFFER_LEN and wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN)
#define system_sprintf(buff, max, flags, data) \
::sprintf(buff, flags, data)
#define SYSTEM_SPRINTF_IS_UNSAFE
#endif
// ---------------------------------------------------------------------------
// printf format string parsing
// ---------------------------------------------------------------------------
// some limits of our implementation
#define wxMAX_SVNPRINTF_ARGUMENTS 64
#define wxMAX_SVNPRINTF_FLAGBUFFER_LEN 32
#define wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN 512
// the conversion specifiers accepted by wxCRT_VsnprintfW
enum wxPrintfArgType {
wxPAT_INVALID = -1,
wxPAT_INT, // %d, %i, %o, %u, %x, %X
wxPAT_LONGINT, // %ld, etc
#ifdef wxLongLong_t
wxPAT_LONGLONGINT, // %Ld, etc
#endif
wxPAT_SIZET, // %Zd, etc
wxPAT_DOUBLE, // %e, %E, %f, %g, %G
wxPAT_LONGDOUBLE, // %le, etc
wxPAT_POINTER, // %p
wxPAT_CHAR, // %hc (in ANSI mode: %c, too)
wxPAT_WCHAR, // %lc (in Unicode mode: %c, too)
wxPAT_PCHAR, // %s (related to a char *)
wxPAT_PWCHAR, // %s (related to a wchar_t *)
wxPAT_NINT, // %n
wxPAT_NSHORTINT, // %hn
wxPAT_NLONGINT // %ln
};
// an argument passed to wxCRT_VsnprintfW
typedef union {
int pad_int; // %d, %i, %o, %u, %x, %X
long int pad_longint; // %ld, etc
#ifdef wxLongLong_t
wxLongLong_t pad_longlongint; // %Ld, etc
#endif
size_t pad_sizet; // %Zd, etc
double pad_double; // %e, %E, %f, %g, %G
long double pad_longdouble; // %le, etc
void *pad_pointer; // %p
char pad_char; // %hc (in ANSI mode: %c, too)
wchar_t pad_wchar; // %lc (in Unicode mode: %c, too)
void *pad_str; // %s
int *pad_nint; // %n
short int *pad_nshortint; // %hn
long int *pad_nlongint; // %ln
} wxPrintfArg;
// helper for converting string into either char* or wchar_t* dependening
// on the type of wxPrintfConvSpec<T> instantiation:
template<typename CharType> struct wxPrintfStringHelper {};
template<> struct wxPrintfStringHelper<char>
{
typedef const wxWX2MBbuf ConvertedType;
static ConvertedType Convert(const wxString& s) { return s.mb_str(); }
};
template<> struct wxPrintfStringHelper<wchar_t>
{
typedef const wxWX2WCbuf ConvertedType;
static ConvertedType Convert(const wxString& s) { return s.wc_str(); }
};
// Contains parsed data relative to a conversion specifier given to
// wxCRT_VsnprintfW and parsed from the format string
// NOTE: in C++ there is almost no difference between struct & classes thus
// there is no performance gain by using a struct here...
template<typename CharType>
class wxPrintfConvSpec
{
public:
// the position of the argument relative to this conversion specifier
size_t m_pos;
// the type of this conversion specifier
wxPrintfArgType m_type;
// the minimum and maximum width
// when one of this var is set to -1 it means: use the following argument
// in the stack as minimum/maximum width for this conversion specifier
int m_nMinWidth, m_nMaxWidth;
// does the argument need to the be aligned to left ?
bool m_bAlignLeft;
// pointer to the '%' of this conversion specifier in the format string
// NOTE: this points somewhere in the string given to the Parse() function -
// it's task of the caller ensure that memory is still valid !
const CharType *m_pArgPos;
// pointer to the last character of this conversion specifier in the
// format string
// NOTE: this points somewhere in the string given to the Parse() function -
// it's task of the caller ensure that memory is still valid !
const CharType *m_pArgEnd;
// a little buffer where formatting flags like #+\.hlqLZ are stored by Parse()
// for use in Process()
// NB: even if this buffer is used only for numeric conversion specifiers
// and thus could be safely declared as a char[] buffer, we want it to
// be wchar_t so that in Unicode builds we can avoid to convert its
// contents to Unicode chars when copying it in user's buffer.
char m_szFlags[wxMAX_SVNPRINTF_FLAGBUFFER_LEN];
public:
// we don't declare this as a constructor otherwise it would be called
// automatically and we don't want this: to be optimized, wxCRT_VsnprintfW
// calls this function only on really-used instances of this class.
void Init();
// Parses the first conversion specifier in the given string, which must
// begin with a '%'. Returns false if the first '%' does not introduce a
// (valid) conversion specifier and thus should be ignored.
bool Parse(const CharType *format);
// Process this conversion specifier and puts the result in the given
// buffer. Returns the number of characters written in 'buf' or -1 if
// there's not enough space.
int Process(CharType *buf, size_t lenMax, wxPrintfArg *p, size_t written);
// Loads the argument of this conversion specifier from given va_list.
bool LoadArg(wxPrintfArg *p, va_list &argptr);
private:
// An helper function of LoadArg() which is used to handle the '*' flag
void ReplaceAsteriskWith(int w);
};
template<typename CharType>
void wxPrintfConvSpec<CharType>::Init()
{
m_nMinWidth = 0;
m_nMaxWidth = 0xFFFF;
m_pos = 0;
m_bAlignLeft = false;
m_pArgPos = m_pArgEnd = NULL;
m_type = wxPAT_INVALID;
// this character will never be removed from m_szFlags array and
// is important when calling sprintf() in wxPrintfConvSpec::Process() !
m_szFlags[0] = '%';
}
template<typename CharType>
bool wxPrintfConvSpec<CharType>::Parse(const CharType *format)
{
bool done = false;
// temporary parse data
size_t flagofs = 1;
bool in_prec, // true if we found the dot in some previous iteration
prec_dot; // true if the dot has been already added to m_szFlags
int ilen = 0;
m_bAlignLeft = in_prec = prec_dot = false;
m_pArgPos = m_pArgEnd = format;
do
{
#define CHECK_PREC \
if (in_prec && !prec_dot) \
{ \
m_szFlags[flagofs++] = '.'; \
prec_dot = true; \
}
// what follows '%'?
const CharType ch = *(++m_pArgEnd);
switch ( ch )
{
case wxT('\0'):
return false; // not really an argument
case wxT('%'):
return false; // not really an argument
case wxT('#'):
case wxT('0'):
case wxT(' '):
case wxT('+'):
case wxT('\''):
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
break;
case wxT('-'):
CHECK_PREC
m_bAlignLeft = true;
m_szFlags[flagofs++] = char(ch);
break;
case wxT('.'):
CHECK_PREC
in_prec = true;
prec_dot = false;
m_nMaxWidth = 0;
// dot will be auto-added to m_szFlags if non-negative
// number follows
break;
case wxT('h'):
ilen = -1;
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
break;
case wxT('l'):
// NB: it's safe to use flagofs-1 as flagofs always start from 1
if (m_szFlags[flagofs-1] == 'l') // 'll' modifier is the same as 'L' or 'q'
ilen = 2;
else
ilen = 1;
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
break;
case wxT('q'):
case wxT('L'):
ilen = 2;
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
break;
#ifdef __WXMSW__
// under Windows we support the special '%I64' notation as longlong
// integer conversion specifier for MSVC compatibility
// (it behaves exactly as '%lli' or '%Li' or '%qi')
case wxT('I'):
if (*(m_pArgEnd+1) != wxT('6') ||
*(m_pArgEnd+2) != wxT('4'))
return false; // bad format
m_pArgEnd++;
m_pArgEnd++;
ilen = 2;
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
m_szFlags[flagofs++] = '6';
m_szFlags[flagofs++] = '4';
break;
#endif // __WXMSW__
case wxT('Z'):
ilen = 3;
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
break;
case wxT('*'):
if (in_prec)
{
CHECK_PREC
// tell Process() to use the next argument
// in the stack as maxwidth...
m_nMaxWidth = -1;
}
else
{
// tell Process() to use the next argument
// in the stack as minwidth...
m_nMinWidth = -1;
}
// save the * in our formatting buffer...
// will be replaced later by Process()
m_szFlags[flagofs++] = char(ch);
break;
case wxT('1'): case wxT('2'): case wxT('3'):
case wxT('4'): case wxT('5'): case wxT('6'):
case wxT('7'): case wxT('8'): case wxT('9'):
{
int len = 0;
CHECK_PREC
while ( (*m_pArgEnd >= CharType('0')) &&
(*m_pArgEnd <= CharType('9')) )
{
m_szFlags[flagofs++] = char(*m_pArgEnd);
len = len*10 + (*m_pArgEnd - wxT('0'));
m_pArgEnd++;
}
if (in_prec)
m_nMaxWidth = len;
else
m_nMinWidth = len;
m_pArgEnd--; // the main loop pre-increments n again
}
break;
case wxT('$'): // a positional parameter (e.g. %2$s) ?
{
if (m_nMinWidth <= 0)
break; // ignore this formatting flag as no
// numbers are preceding it
// remove from m_szFlags all digits previously added
do {
flagofs--;
} while (m_szFlags[flagofs] >= '1' &&
m_szFlags[flagofs] <= '9');
// re-adjust the offset making it point to the
// next free char of m_szFlags
flagofs++;
m_pos = m_nMinWidth;
m_nMinWidth = 0;
}
break;
case wxT('d'):
case wxT('i'):
case wxT('o'):
case wxT('u'):
case wxT('x'):
case wxT('X'):
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
m_szFlags[flagofs] = '\0';
if (ilen == 0)
m_type = wxPAT_INT;
else if (ilen == -1)
// NB: 'short int' value passed through '...'
// is promoted to 'int', so we have to get
// an int from stack even if we need a short
m_type = wxPAT_INT;
else if (ilen == 1)
m_type = wxPAT_LONGINT;
else if (ilen == 2)
#ifdef wxLongLong_t
m_type = wxPAT_LONGLONGINT;
#else // !wxLongLong_t
m_type = wxPAT_LONGINT;
#endif // wxLongLong_t/!wxLongLong_t
else if (ilen == 3)
m_type = wxPAT_SIZET;
done = true;
break;
case wxT('e'):
case wxT('E'):
case wxT('f'):
case wxT('g'):
case wxT('G'):
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
m_szFlags[flagofs] = '\0';
if (ilen == 2)
m_type = wxPAT_LONGDOUBLE;
else
m_type = wxPAT_DOUBLE;
done = true;
break;
case wxT('p'):
m_type = wxPAT_POINTER;
m_szFlags[flagofs++] = char(ch);
m_szFlags[flagofs] = '\0';
done = true;
break;
case wxT('c'):
if (ilen == -1)
{
// in Unicode mode %hc == ANSI character
// and in ANSI mode, %hc == %c == ANSI...
m_type = wxPAT_CHAR;
}
else if (ilen == 1)
{
// in ANSI mode %lc == Unicode character
// and in Unicode mode, %lc == %c == Unicode...
m_type = wxPAT_WCHAR;
}
else
{
#if wxUSE_UNICODE
// in Unicode mode, %c == Unicode character
m_type = wxPAT_WCHAR;
#else
// in ANSI mode, %c == ANSI character
m_type = wxPAT_CHAR;
#endif
}
done = true;
break;
case wxT('s'):
if (ilen == -1)
{
// Unicode mode wx extension: we'll let %hs mean non-Unicode
// strings (when in ANSI mode, %s == %hs == ANSI string)
m_type = wxPAT_PCHAR;
}
else if (ilen == 1)
{
// in Unicode mode, %ls == %s == Unicode string
// in ANSI mode, %ls == Unicode string
m_type = wxPAT_PWCHAR;
}
else
{
#if wxUSE_UNICODE
m_type = wxPAT_PWCHAR;
#else
m_type = wxPAT_PCHAR;
#endif
}
done = true;
break;
case wxT('n'):
if (ilen == 0)
m_type = wxPAT_NINT;
else if (ilen == -1)
m_type = wxPAT_NSHORTINT;
else if (ilen >= 1)
m_type = wxPAT_NLONGINT;
done = true;
break;
default:
// bad format, don't consider this an argument;
// leave it unchanged
return false;
}
if (flagofs == wxMAX_SVNPRINTF_FLAGBUFFER_LEN)
{
wxLogDebug(wxT("Too many flags specified for a single conversion specifier!"));
return false;
}
}
while (!done);
return true; // parsing was successful
}
template<typename CharType>
void wxPrintfConvSpec<CharType>::ReplaceAsteriskWith(int width)
{
char temp[wxMAX_SVNPRINTF_FLAGBUFFER_LEN];
// find the first * in our flag buffer
char *pwidth = strchr(m_szFlags, '*');
wxCHECK_RET(pwidth, _T("field width must be specified"));
// save what follows the * (the +1 is to skip the asterisk itself!)
strcpy(temp, pwidth+1);
if (width < 0)
{
pwidth[0] = wxT('-');
pwidth++;
}
// replace * with the actual integer given as width
#ifndef SYSTEM_SPRINTF_IS_UNSAFE
int maxlen = (m_szFlags + wxMAX_SVNPRINTF_FLAGBUFFER_LEN - pwidth) /
sizeof(*m_szFlags);
#endif
int offset = system_sprintf(pwidth, maxlen, "%d", abs(width));
// restore after the expanded * what was following it
strcpy(pwidth+offset, temp);
}
template<typename CharType>
bool wxPrintfConvSpec<CharType>::LoadArg(wxPrintfArg *p, va_list &argptr)
{
// did the '*' width/precision specifier was used ?
if (m_nMaxWidth == -1)
{
// take the maxwidth specifier from the stack
m_nMaxWidth = va_arg(argptr, int);
if (m_nMaxWidth < 0)
m_nMaxWidth = 0;
else
ReplaceAsteriskWith(m_nMaxWidth);
}
if (m_nMinWidth == -1)
{
// take the minwidth specifier from the stack
m_nMinWidth = va_arg(argptr, int);
ReplaceAsteriskWith(m_nMinWidth);
if (m_nMinWidth < 0)
{
m_bAlignLeft = !m_bAlignLeft;
m_nMinWidth = -m_nMinWidth;
}
}
switch (m_type) {
case wxPAT_INT:
p->pad_int = va_arg(argptr, int);
break;
case wxPAT_LONGINT:
p->pad_longint = va_arg(argptr, long int);
break;
#ifdef wxLongLong_t
case wxPAT_LONGLONGINT:
p->pad_longlongint = va_arg(argptr, wxLongLong_t);
break;
#endif // wxLongLong_t
case wxPAT_SIZET:
p->pad_sizet = va_arg(argptr, size_t);
break;
case wxPAT_DOUBLE:
p->pad_double = va_arg(argptr, double);
break;
case wxPAT_LONGDOUBLE:
p->pad_longdouble = va_arg(argptr, long double);
break;
case wxPAT_POINTER:
p->pad_pointer = va_arg(argptr, void *);
break;
case wxPAT_CHAR:
p->pad_char = (char)va_arg(argptr, int); // char is promoted to int when passed through '...'
break;
case wxPAT_WCHAR:
p->pad_wchar = (wchar_t)va_arg(argptr, int); // char is promoted to int when passed through '...'
break;
case wxPAT_PCHAR:
case wxPAT_PWCHAR:
p->pad_str = va_arg(argptr, void *);
break;
case wxPAT_NINT:
p->pad_nint = va_arg(argptr, int *);
break;
case wxPAT_NSHORTINT:
p->pad_nshortint = va_arg(argptr, short int *);
break;
case wxPAT_NLONGINT:
p->pad_nlongint = va_arg(argptr, long int *);
break;
case wxPAT_INVALID:
default:
return false;
}
return true; // loading was successful
}
template<typename CharType>
int wxPrintfConvSpec<CharType>::Process(CharType *buf, size_t lenMax, wxPrintfArg *p, size_t written)
{
// buffer to avoid dynamic memory allocation each time for small strings;
// note that this buffer is used only to hold results of number formatting,
// %s directly writes user's string in buf, without using szScratch
char szScratch[wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN];
size_t lenScratch = 0, lenCur = 0;
#define APPEND_CH(ch) \
{ \
if ( lenCur == lenMax ) \
return -1; \
\
buf[lenCur++] = ch; \
}
switch ( m_type )
{
case wxPAT_INT:
lenScratch = system_sprintf(szScratch, wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN, m_szFlags, p->pad_int);
break;
case wxPAT_LONGINT:
lenScratch = system_sprintf(szScratch, wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN, m_szFlags, p->pad_longint);
break;
#ifdef wxLongLong_t
case wxPAT_LONGLONGINT:
lenScratch = system_sprintf(szScratch, wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN, m_szFlags, p->pad_longlongint);
break;
#endif // SIZEOF_LONG_LONG
case wxPAT_SIZET:
lenScratch = system_sprintf(szScratch, wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN, m_szFlags, p->pad_sizet);
break;
case wxPAT_LONGDOUBLE:
lenScratch = system_sprintf(szScratch, wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN, m_szFlags, p->pad_longdouble);
break;
case wxPAT_DOUBLE:
lenScratch = system_sprintf(szScratch, wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN, m_szFlags, p->pad_double);
break;
case wxPAT_POINTER:
lenScratch = system_sprintf(szScratch, wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN, m_szFlags, p->pad_pointer);
break;
case wxPAT_CHAR:
case wxPAT_WCHAR:
{
wxUniChar ch;
if (m_type == wxPAT_CHAR)
ch = p->pad_char;
else // m_type == wxPAT_WCHAR
ch = p->pad_wchar;
CharType val = ch;
size_t i;
if (!m_bAlignLeft)
for (i = 1; i < (size_t)m_nMinWidth; i++)
APPEND_CH(_T(' '));
APPEND_CH(val);
if (m_bAlignLeft)
for (i = 1; i < (size_t)m_nMinWidth; i++)
APPEND_CH(_T(' '));
}
break;
case wxPAT_PCHAR:
case wxPAT_PWCHAR:
{
wxArgNormalizedString arg(p->pad_str);
wxString s = arg;
if ( !arg.IsValid() && m_nMaxWidth >= 6 )
s = wxT("(null)");
typename wxPrintfStringHelper<CharType>::ConvertedType strbuf(
wxPrintfStringHelper<CharType>::Convert(s));
// at this point we are sure that m_nMaxWidth is positive or
// null (see top of wxPrintfConvSpec::LoadArg)
int len = wxMin((unsigned int)m_nMaxWidth, wxStrlen(strbuf));
int i;
if (!m_bAlignLeft)
{
for (i = len; i < m_nMinWidth; i++)
APPEND_CH(_T(' '));
}
len = wxMin((unsigned int)len, lenMax-lenCur);
wxStrncpy(buf+lenCur, strbuf, len);
lenCur += len;
if (m_bAlignLeft)
{
for (i = len; i < m_nMinWidth; i++)
APPEND_CH(_T(' '));
}
}
break;
case wxPAT_NINT:
*p->pad_nint = written;
break;
case wxPAT_NSHORTINT:
*p->pad_nshortint = (short int)written;
break;
case wxPAT_NLONGINT:
*p->pad_nlongint = written;
break;
case wxPAT_INVALID:
default:
return -1;
}
// if we used system's sprintf() then we now need to append the s_szScratch
// buffer to the given one...
switch (m_type)
{
case wxPAT_INT:
case wxPAT_LONGINT:
#ifdef wxLongLong_t
case wxPAT_LONGLONGINT:
#endif
case wxPAT_SIZET:
case wxPAT_LONGDOUBLE:
case wxPAT_DOUBLE:
case wxPAT_POINTER:
wxASSERT(lenScratch < wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN);
// NB: 1) we can compare lenMax (for CharType*, i.e. possibly
// wchar_t*) with lenScratch (char*) because this code is
// formatting integers and that will have the same length
// even in UTF-8 (the only case when char* length may be
// more than wchar_t* length of the same string)
// 2) wxStrncpy converts the 2nd argument to 1st argument's
// type transparently if their types differ, so this code
// works for both instantiations
if (lenMax < lenScratch)
{
// fill output buffer and then return -1
wxStrncpy(buf, szScratch, lenMax);
return -1;
}
wxStrncpy(buf, szScratch, lenScratch);
lenCur += lenScratch;
break;
default:
break; // all other cases were completed previously
}
return lenCur;
}
// helper that parses format string
template<typename CharType>
struct wxPrintfConvSpecParser
{
wxPrintfConvSpecParser(const CharType *format)
: posarg_present(false), nonposarg_present(false),
nargs(0)
{
memset(pspec, 0, sizeof(pspec));
const CharType *toparse = format;
// parse the format string
for (; *toparse != wxT('\0'); toparse++)
{
if (*toparse == wxT('%') )
{
arg[nargs].Init();
// let's see if this is a (valid) conversion specifier...
if (arg[nargs].Parse(toparse))
{
// ...yes it is
wxPrintfConvSpec<CharType> *current = &arg[nargs];
// make toparse point to the end of this specifier
toparse = current->m_pArgEnd;
if (current->m_pos > 0)
{
// the positionals start from number 1... adjust the index
current->m_pos--;
posarg_present = true;
}
else
{
// not a positional argument...
current->m_pos = nargs;
nonposarg_present = true;
}
// this conversion specifier is tied to the pos-th argument...
pspec[current->m_pos] = current;
nargs++;
if (nargs == wxMAX_SVNPRINTF_ARGUMENTS)
{
wxLogDebug(wxT("A single call to wxVsnprintf() has more than %d arguments; ")
wxT("ignoring all remaining arguments."), wxMAX_SVNPRINTF_ARGUMENTS);
break; // cannot handle any additional conv spec
}
}
else
{
// it's safe to look in the next character of toparse as at
// worst we'll hit its \0
if (*(toparse+1) == wxT('%'))
{
// the Parse() returned false because we've found a %%
toparse++;
}
}
}
}
}
wxPrintfConvSpec<CharType> arg[wxMAX_SVNPRINTF_ARGUMENTS];
wxPrintfConvSpec<CharType> *pspec[wxMAX_SVNPRINTF_ARGUMENTS];
bool posarg_present, nonposarg_present;
unsigned nargs;
};
#undef APPEND_CH
#undef CHECK_PREC
#endif // _WX_PRIVATE_WXPRINTF_H_
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