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wxWidgets/include/wx/private/wxprintf.h
Vadim Zeitlin 3f66f6a5b3 Remove all lines containing cvs/svn "$Id$" keyword. 
This keyword is not expanded by Git which means it's not replaced with the
correct revision value in the releases made using git-based scripts and it's
confusing to have lines with unexpanded "$Id$" in the released files. As
expanding them with Git is not that simple (it could be done with git archive
and export-subst attribute) and there are not many benefits in having them in
the first place, just remove all these lines.

If nothing else, this will make an eventual transition to Git simpler.

Closes #14487.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2013-07-26 16:02:46 +00:00

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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
// 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 "wx/log.h"
#include "wx/utils.h"
#include <string.h>
// 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
wxPAT_STAR // '*' used for width or precision
};
// an argument passed to wxCRT_VsnprintfW
union wxPrintfArg
{
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
};
// helper for converting string into either char* or wchar_t* depending
// 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()
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;
memset(m_szFlags, 0, sizeof(m_szFlags));
// 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('.'):
// don't use CHECK_PREC here to avoid warning about the value
// assigned to prec_dot inside it being never used (because
// overwritten just below) from Borland in release build
if (in_prec && !prec_dot)
m_szFlags[flagofs++] = '.';
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 __WINDOWS__
// 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'))
{
m_pArgEnd++;
m_pArgEnd++;
ilen = 2;
CHECK_PREC
m_szFlags[flagofs++] = char(ch);
m_szFlags[flagofs++] = '6';
m_szFlags[flagofs++] = '4';
break;
}
// else: fall-through, 'I' is MSVC equivalent of C99 'z'
#endif // __WINDOWS__
case wxT('z'):
case wxT('Z'):
// 'z' is C99 standard for size_t and ptrdiff_t, 'Z' was used
// for this purpose in libc5 and by wx <= 2.8
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);
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);
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);
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, wxT("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_STAR:
// this will be handled as part of the next argument
return true;
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(wxT(' '));
APPEND_CH(val);
if (m_bAlignLeft)
for (i = 1; i < (size_t)m_nMinWidth; i++)
APPEND_CH(wxT(' '));
}
break;
case wxPAT_PCHAR:
case wxPAT_PWCHAR:
{
wxString s;
if ( !p->pad_str )
{
if ( m_nMaxWidth >= 6 )
s = wxT("(null)");
}
else if (m_type == wxPAT_PCHAR)
s.assign(static_cast<const char *>(p->pad_str));
else // m_type == wxPAT_PWCHAR
s.assign(static_cast<const wchar_t *>(p->pad_str));
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(wxT(' '));
}
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(wxT(' '));
}
}
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
{
typedef wxPrintfConvSpec<CharType> ConvSpec;
wxPrintfConvSpecParser(const CharType *fmt)
{
nargs = 0;
posarg_present =
nonposarg_present = false;
memset(pspec, 0, sizeof(pspec));
// parse the format string
for ( const CharType *toparse = fmt; *toparse != wxT('\0'); toparse++ )
{
// skip everything except format specifications
if ( *toparse != '%' )
continue;
// also skip escaped percent signs
if ( toparse[1] == '%' )
{
toparse++;
continue;
}
ConvSpec *spec = &specs[nargs];
spec->Init();
// attempt to parse this format specification
if ( !spec->Parse(toparse) )
continue;
// advance to the end of this specifier
toparse = spec->m_pArgEnd;
// special handling for specifications including asterisks: we need
// to reserve an extra slot (or two if asterisks were used for both
// width and precision) in specs array in this case
if ( const char *f = strchr(spec->m_szFlags, '*') )
{
unsigned numAsterisks = 1;
if ( strchr(++f, '*') )
numAsterisks++;
for ( unsigned n = 0; n < numAsterisks; n++ )
{
if ( nargs++ == wxMAX_SVNPRINTF_ARGUMENTS )
break;
// TODO: we need to support specifiers of the form "%2$*1$s"
// (this is the same as "%*s") as if any positional arguments
// are used all asterisks must be positional as well but this
// requires a lot of changes in this code (basically we'd need
// to rewrite Parse() to return "*" and conversion itself as
// separate entries)
if ( posarg_present )
{
wxFAIL_MSG
(
wxString::Format
(
"Format string \"%s\" uses both positional "
"parameters and '*' but this is not currently "
"supported by this implementation, sorry.",
fmt
)
);
}
specs[nargs] = *spec;
// make an entry for '*' and point to it from pspec
spec->Init();
spec->m_type = wxPAT_STAR;
pspec[nargs - 1] = spec;
spec = &specs[nargs];
}
}
// check if this is a positional or normal argument
if ( spec->m_pos > 0 )
{
// the positional arguments start from number 1 so we need
// to adjust the index
spec->m_pos--;
posarg_present = true;
}
else // not a positional argument...
{
spec->m_pos = nargs;
nonposarg_present = true;
}
// this conversion specifier is tied to the pos-th argument...
pspec[spec->m_pos] = spec;
if ( nargs++ == wxMAX_SVNPRINTF_ARGUMENTS )
break;
}
// warn if we lost any arguments (the program probably will crash
// anyhow because of stack corruption...)
if ( nargs == wxMAX_SVNPRINTF_ARGUMENTS )
{
wxFAIL_MSG
(
wxString::Format
(
"wxVsnprintf() currently supports only %d arguments, "
"but format string \"%s\" defines more of them.\n"
"You need to change wxMAX_SVNPRINTF_ARGUMENTS and "
"recompile if more are really needed.",
fmt, wxMAX_SVNPRINTF_ARGUMENTS
)
);
}
}
// total number of valid elements in specs
unsigned nargs;
// all format specifications in this format string in order of their
// appearance (which may be different from arguments order)
ConvSpec specs[wxMAX_SVNPRINTF_ARGUMENTS];
// pointer to specs array element for the N-th argument
ConvSpec *pspec[wxMAX_SVNPRINTF_ARGUMENTS];
// true if any positional/non-positional parameters are used
bool posarg_present,
nonposarg_present;
};
#undef APPEND_CH
#undef CHECK_PREC
#endif // _WX_PRIVATE_WXPRINTF_H_
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