969 lines
31 KiB
C++
969 lines
31 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/private/wxprintf.h
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// Purpose: wxWidgets wxPrintf() implementation
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// Author: Ove Kaven
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// Modified by: Ron Lee, Francesco Montorsi
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// Created: 09/04/99
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// Copyright: (c) wxWidgets copyright
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_PRIVATE_WXPRINTF_H_
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#define _WX_PRIVATE_WXPRINTF_H_
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// ---------------------------------------------------------------------------
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// headers and macros
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// ---------------------------------------------------------------------------
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#include "wx/crt.h"
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#include "wx/log.h"
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#include "wx/utils.h"
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#include <limits.h>
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#include <string.h>
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// prefer snprintf over sprintf
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#if defined(__VISUALC__)
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#define system_sprintf(buff, max, flags, data) \
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::_snprintf(buff, max, flags, data)
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#elif defined(HAVE_SNPRINTF)
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#define system_sprintf(buff, max, flags, data) \
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::snprintf(buff, max, flags, data)
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#else // NB: at least sprintf() should always be available
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// since 'max' is not used in this case, wxVsnprintf() should always
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// ensure that 'buff' is big enough for all common needs
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// (see wxMAX_SVNPRINTF_FLAGBUFFER_LEN and wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN)
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#define system_sprintf(buff, max, flags, data) \
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::sprintf(buff, flags, data)
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#define SYSTEM_SPRINTF_IS_UNSAFE
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#endif
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// ---------------------------------------------------------------------------
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// printf format string parsing
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// ---------------------------------------------------------------------------
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// some limits of our implementation
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#define wxMAX_SVNPRINTF_ARGUMENTS 64
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#define wxMAX_SVNPRINTF_FLAGBUFFER_LEN 32
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#define wxMAX_SVNPRINTF_SCRATCHBUFFER_LEN 512
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// the conversion specifiers accepted by wxCRT_VsnprintfW
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enum wxPrintfArgType
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{
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wxPAT_INVALID = -1,
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wxPAT_INT, // %d, %i, %o, %u, %x, %X
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wxPAT_LONGINT, // %ld, etc
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#ifdef wxLongLong_t
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wxPAT_LONGLONGINT, // %Ld, etc
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#endif
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wxPAT_SIZET, // %zd, etc
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wxPAT_DOUBLE, // %e, %E, %f, %g, %G
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wxPAT_LONGDOUBLE, // %le, etc
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wxPAT_POINTER, // %p
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wxPAT_CHAR, // %hc (in ANSI mode: %c, too)
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wxPAT_WCHAR, // %lc (in Unicode mode: %c, too)
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wxPAT_PCHAR, // %s (related to a char *)
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wxPAT_PWCHAR, // %s (related to a wchar_t *)
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wxPAT_NINT, // %n
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wxPAT_NSHORTINT, // %hn
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wxPAT_NLONGINT, // %ln
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wxPAT_STAR // '*' used for width or precision
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};
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// an argument passed to wxCRT_VsnprintfW
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union wxPrintfArg
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{
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int pad_int; // %d, %i, %o, %u, %x, %X
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long int pad_longint; // %ld, etc
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#ifdef wxLongLong_t
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wxLongLong_t pad_longlongint; // %Ld, etc
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#endif
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size_t pad_sizet; // %zd, etc
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double pad_double; // %e, %E, %f, %g, %G
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long double pad_longdouble; // %le, etc
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void *pad_pointer; // %p
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char pad_char; // %hc (in ANSI mode: %c, too)
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wchar_t pad_wchar; // %lc (in Unicode mode: %c, too)
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void *pad_str; // %s
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int *pad_nint; // %n
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short int *pad_nshortint; // %hn
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long int *pad_nlongint; // %ln
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};
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// helper for converting string into either char* or wchar_t* depending
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// on the type of wxPrintfConvSpec<T> instantiation:
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template<typename CharType> struct wxPrintfStringHelper {};
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template<> struct wxPrintfStringHelper<char>
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{
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typedef const wxWX2MBbuf ConvertedType;
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static ConvertedType Convert(const wxString& s) { return s.mb_str(); }
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};
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template<> struct wxPrintfStringHelper<wchar_t>
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{
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typedef const wxWX2WCbuf ConvertedType;
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static ConvertedType Convert(const wxString& s) { return s.wc_str(); }
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};
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// Contains parsed data relative to a conversion specifier given to
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// wxCRT_VsnprintfW and parsed from the format string
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// NOTE: in C++ there is almost no difference between struct & classes thus
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// there is no performance gain by using a struct here...
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template<typename CharType>
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class wxPrintfConvSpec
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{
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public:
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// the position of the argument relative to this conversion specifier
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size_t m_pos;
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// the type of this conversion specifier
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wxPrintfArgType m_type;
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// the minimum and maximum width
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// when one of this var is set to -1 it means: use the following argument
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// in the stack as minimum/maximum width for this conversion specifier
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int m_nMinWidth, m_nMaxWidth;
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// does the argument need to the be aligned to left ?
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bool m_bAlignLeft;
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// pointer to the '%' of this conversion specifier in the format string
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// NOTE: this points somewhere in the string given to the Parse() function -
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// it's task of the caller ensure that memory is still valid !
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const CharType *m_pArgPos;
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// pointer to the last character of this conversion specifier in the
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// format string
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// NOTE: this points somewhere in the string given to the Parse() function -
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// it's task of the caller ensure that memory is still valid !
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const CharType *m_pArgEnd;
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// a little buffer where formatting flags like #+\.hlqLz are stored by Parse()
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// for use in Process()
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char m_szFlags[wxMAX_SVNPRINTF_FLAGBUFFER_LEN];
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public:
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// we don't declare this as a constructor otherwise it would be called
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// automatically and we don't want this: to be optimized, wxCRT_VsnprintfW
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// calls this function only on really-used instances of this class.
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void Init();
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// Parses the first conversion specifier in the given string, which must
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// begin with a '%'. Returns false if the first '%' does not introduce a
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// (valid) conversion specifier and thus should be ignored.
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bool Parse(const CharType *format);
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// Process this conversion specifier and puts the result in the given
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// buffer. Returns the number of characters written in 'buf' or -1 if
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// there's not enough space.
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int Process(CharType *buf, size_t lenMax, wxPrintfArg *p, size_t written);
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// Loads the argument of this conversion specifier from given va_list.
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bool LoadArg(wxPrintfArg *p, va_list &argptr);
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private:
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// A helper function of LoadArg() which is used to handle the '*' flag
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void ReplaceAsteriskWith(int w);
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};
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template<typename CharType>
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void wxPrintfConvSpec<CharType>::Init()
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{
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m_nMinWidth = 0;
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m_nMaxWidth = INT_MAX;
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m_pos = 0;
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m_bAlignLeft = false;
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m_pArgPos = m_pArgEnd = NULL;
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m_type = wxPAT_INVALID;
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memset(m_szFlags, 0, sizeof(m_szFlags));
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// this character will never be removed from m_szFlags array and
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// is important when calling sprintf() in wxPrintfConvSpec::Process() !
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m_szFlags[0] = '%';
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}
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template<typename CharType>
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bool wxPrintfConvSpec<CharType>::Parse(const CharType *format)
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{
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bool done = false;
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// temporary parse data
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size_t flagofs = 1;
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bool in_prec, // true if we found the dot in some previous iteration
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prec_dot; // true if the dot has been already added to m_szFlags
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int ilen = 0;
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m_bAlignLeft = in_prec = prec_dot = false;
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m_pArgPos = m_pArgEnd = format;
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do
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{
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#define CHECK_PREC \
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if (in_prec && !prec_dot) \
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{ \
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m_szFlags[flagofs++] = '.'; \
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prec_dot = true; \
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}
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// what follows '%'?
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const CharType ch = *(++m_pArgEnd);
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switch ( ch )
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{
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case wxT('\0'):
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return false; // not really an argument
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case wxT('%'):
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return false; // not really an argument
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case wxT('#'):
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case wxT('0'):
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case wxT(' '):
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case wxT('+'):
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case wxT('\''):
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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break;
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case wxT('-'):
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CHECK_PREC
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m_bAlignLeft = true;
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m_szFlags[flagofs++] = char(ch);
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break;
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case wxT('.'):
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// don't use CHECK_PREC here to avoid warning about the value
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// assigned to prec_dot inside it being never used (because
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// overwritten just below)
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if (in_prec && !prec_dot)
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m_szFlags[flagofs++] = '.';
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in_prec = true;
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prec_dot = false;
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m_nMaxWidth = 0;
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// dot will be auto-added to m_szFlags if non-negative
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// number follows
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break;
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case wxT('h'):
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ilen = -1;
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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break;
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case wxT('l'):
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// NB: it's safe to use flagofs-1 as flagofs always start from 1
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if (m_szFlags[flagofs-1] == 'l') // 'll' modifier is the same as 'L' or 'q'
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ilen = 2;
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else
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ilen = 1;
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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break;
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case wxT('q'):
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case wxT('L'):
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ilen = 2;
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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break;
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#ifdef __WINDOWS__
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// under Windows we support the special '%I64' notation as longlong
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// integer conversion specifier for MSVC compatibility
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// (it behaves exactly as '%lli' or '%Li' or '%qi')
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case wxT('I'):
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if (*(m_pArgEnd+1) == wxT('6') &&
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*(m_pArgEnd+2) == wxT('4'))
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{
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m_pArgEnd++;
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m_pArgEnd++;
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ilen = 2;
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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m_szFlags[flagofs++] = '6';
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m_szFlags[flagofs++] = '4';
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break;
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}
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// else: fall-through, 'I' is MSVC equivalent of C99 'z'
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wxFALLTHROUGH;
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#endif // __WINDOWS__
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case wxT('z'):
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case wxT('Z'):
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// 'z' is C99 standard for size_t and ptrdiff_t, 'Z' was used
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// for this purpose in libc5 and by wx <= 2.8
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ilen = 3;
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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break;
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case wxT('*'):
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if (in_prec)
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{
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CHECK_PREC
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// tell Process() to use the next argument
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// in the stack as maxwidth...
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m_nMaxWidth = -1;
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}
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else
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{
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// tell Process() to use the next argument
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// in the stack as minwidth...
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m_nMinWidth = -1;
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}
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// save the * in our formatting buffer...
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// will be replaced later by Process()
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m_szFlags[flagofs++] = char(ch);
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break;
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case wxT('1'): case wxT('2'): case wxT('3'):
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case wxT('4'): case wxT('5'): case wxT('6'):
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case wxT('7'): case wxT('8'): case wxT('9'):
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{
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int len = 0;
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CHECK_PREC
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while ( (*m_pArgEnd >= CharType('0')) &&
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(*m_pArgEnd <= CharType('9')) )
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{
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m_szFlags[flagofs++] = char(*m_pArgEnd);
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len = len*10 + (*m_pArgEnd - wxT('0'));
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m_pArgEnd++;
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}
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if (in_prec)
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m_nMaxWidth = len;
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else
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m_nMinWidth = len;
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m_pArgEnd--; // the main loop pre-increments n again
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}
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break;
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case wxT('$'): // a positional parameter (e.g. %2$s) ?
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{
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if (m_nMinWidth <= 0)
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break; // ignore this formatting flag as no
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// numbers are preceding it
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// remove from m_szFlags all digits previously added
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do {
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flagofs--;
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} while (m_szFlags[flagofs] >= '1' &&
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m_szFlags[flagofs] <= '9');
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// re-adjust the offset making it point to the
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// next free char of m_szFlags
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flagofs++;
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m_pos = m_nMinWidth;
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m_nMinWidth = 0;
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}
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break;
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case wxT('d'):
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case wxT('i'):
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case wxT('o'):
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case wxT('u'):
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case wxT('x'):
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case wxT('X'):
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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if (ilen == 0)
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m_type = wxPAT_INT;
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else if (ilen == -1)
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// NB: 'short int' value passed through '...'
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// is promoted to 'int', so we have to get
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// an int from stack even if we need a short
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m_type = wxPAT_INT;
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else if (ilen == 1)
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m_type = wxPAT_LONGINT;
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else if (ilen == 2)
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#ifdef wxLongLong_t
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m_type = wxPAT_LONGLONGINT;
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#else // !wxLongLong_t
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m_type = wxPAT_LONGINT;
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#endif // wxLongLong_t/!wxLongLong_t
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else if (ilen == 3)
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m_type = wxPAT_SIZET;
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done = true;
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break;
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case wxT('e'):
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case wxT('E'):
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case wxT('f'):
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case wxT('g'):
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case wxT('G'):
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CHECK_PREC
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m_szFlags[flagofs++] = char(ch);
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if (ilen == 2)
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m_type = wxPAT_LONGDOUBLE;
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else
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m_type = wxPAT_DOUBLE;
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done = true;
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break;
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case wxT('p'):
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m_type = wxPAT_POINTER;
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m_szFlags[flagofs++] = char(ch);
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done = true;
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break;
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case wxT('c'):
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#if wxUSE_UNICODE
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if (ilen == -1)
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{
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// %hc == ANSI character
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m_type = wxPAT_CHAR;
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}
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else
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{
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// %lc == %c == Unicode character
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m_type = wxPAT_WCHAR;
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}
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#else
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if (ilen == 1)
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{
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// %lc == Unicode character
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m_type = wxPAT_WCHAR;
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}
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else
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{
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// %hc == %c == ANSI character
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m_type = wxPAT_CHAR;
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}
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#endif
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done = true;
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break;
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case wxT('s'):
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#if wxUSE_UNICODE
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if (ilen == -1)
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{
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// wx extension: we'll let %hs mean non-Unicode strings
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m_type = wxPAT_PCHAR;
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}
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else
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{
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// %ls == %s == Unicode string
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m_type = wxPAT_PWCHAR;
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}
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#else
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if (ilen == 1)
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{
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// %ls == Unicode string
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m_type = wxPAT_PWCHAR;
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}
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else
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{
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// %s == %hs == ANSI string
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m_type = wxPAT_PCHAR;
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}
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#endif
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done = true;
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break;
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case wxT('n'):
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if (ilen == 0)
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m_type = wxPAT_NINT;
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else if (ilen == -1)
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m_type = wxPAT_NSHORTINT;
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else if (ilen >= 1)
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m_type = wxPAT_NLONGINT;
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done = true;
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break;
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default:
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// bad format, don't consider this an argument;
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// leave it unchanged
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return false;
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}
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if (flagofs == wxMAX_SVNPRINTF_FLAGBUFFER_LEN)
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{
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wxLogDebug(wxT("Too many flags specified for a single conversion specifier!"));
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return false;
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}
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}
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while (!done);
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return true; // parsing was successful
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}
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template<typename CharType>
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void wxPrintfConvSpec<CharType>::ReplaceAsteriskWith(int width)
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{
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char temp[wxMAX_SVNPRINTF_FLAGBUFFER_LEN];
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// find the first * in our flag buffer
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char *pwidth = strchr(m_szFlags, '*');
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wxCHECK_RET(pwidth, wxT("field width must be specified"));
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// save what follows the * (the +1 is to skip the asterisk itself!)
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strcpy(temp, pwidth+1);
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if (width < 0)
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{
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pwidth[0] = wxT('-');
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pwidth++;
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}
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// replace * with the actual integer given as width
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#ifndef SYSTEM_SPRINTF_IS_UNSAFE
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int maxlen = (m_szFlags + wxMAX_SVNPRINTF_FLAGBUFFER_LEN - pwidth) /
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sizeof(*m_szFlags);
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#endif
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int offset = system_sprintf(pwidth, maxlen, "%d", abs(width));
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// restore after the expanded * what was following it
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strcpy(pwidth+offset, temp);
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}
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template<typename CharType>
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bool wxPrintfConvSpec<CharType>::LoadArg(wxPrintfArg *p, va_list &argptr)
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{
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// did the '*' width/precision specifier was used ?
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if (m_nMaxWidth == -1)
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{
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|
// 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)
|
|
{
|
|
nspecs =
|
|
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[nspecs];
|
|
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 ( ++nspecs == 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
|
|
(wxASCII_STR(
|
|
"Format string \"%s\" uses both positional "
|
|
"parameters and '*' but this is not currently "
|
|
"supported by this implementation, sorry."),
|
|
fmt
|
|
)
|
|
);
|
|
}
|
|
|
|
specs[nspecs] = *spec;
|
|
|
|
// make an entry for '*' and point to it from pspec
|
|
spec->Init();
|
|
spec->m_type = wxPAT_STAR;
|
|
pspec[nargs++] = spec;
|
|
|
|
spec = &specs[nspecs];
|
|
}
|
|
|
|
// If we hit the maximal number of arguments inside the inner
|
|
// loop, break out of the outer one as well.
|
|
if ( nspecs == wxMAX_SVNPRINTF_ARGUMENTS )
|
|
break;
|
|
}
|
|
|
|
|
|
// 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--;
|
|
|
|
// We could be reusing an already existing argument, only
|
|
// increment their number if it's really a new one.
|
|
if ( spec->m_pos >= nargs )
|
|
{
|
|
nargs = spec->m_pos + 1;
|
|
}
|
|
else if ( pspec[spec->m_pos] ) // Had we seen it before?
|
|
{
|
|
// Check that the type specified this time is compatible
|
|
// with the previously-specified type.
|
|
wxASSERT_MSG
|
|
(
|
|
pspec[spec->m_pos]->m_type == spec->m_type,
|
|
"Positional parameter specified multiple times "
|
|
"with incompatible types."
|
|
);
|
|
}
|
|
|
|
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 ( ++nspecs == wxMAX_SVNPRINTF_ARGUMENTS )
|
|
break;
|
|
}
|
|
|
|
|
|
// warn if we lost any arguments (the program probably will crash
|
|
// anyhow because of stack corruption...)
|
|
if ( nspecs == wxMAX_SVNPRINTF_ARGUMENTS )
|
|
{
|
|
wxFAIL_MSG
|
|
(
|
|
wxString::Format
|
|
(wxASCII_STR(
|
|
"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 nspecs;
|
|
|
|
// total number of arguments, also number of valid elements in pspec, and
|
|
// always less than or (usually) equal to nspecs
|
|
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_
|