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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/***
* mbusafecrt.c - implementaion of support functions and data for MBUSafeCRT
*
*
* Purpose:
* This file contains the implementation of support functions and
* data for MBUSafeCRT declared in mbusafecrt.h and mbusafecrt_internal.h.
****/
#include "pal/palinternal.h"
#include <string.h>
#include <errno.h>
#include <limits.h>
#include "mbusafecrt_internal.h"
/* global data */
tSafeCRT_AssertFuncPtr sMBUSafeCRTAssertFunc = NULL;
/***
* MBUSafeCRTSetAssertFunc - Set the function called when an assert fails.
****/
void MBUSafeCRTSetAssertFunc( tSafeCRT_AssertFuncPtr inAssertFuncPtr )
{
/* set it */
sMBUSafeCRTAssertFunc = inAssertFuncPtr;
}
/***
* _putc_nolock - putc for the miniFILE stream.
****/
int _putc_nolock( char inChar, miniFILE* inStream )
{
int returnValue = EOF;
inStream->_cnt -= sizeof( char );
if ( ( inStream->_cnt ) >= 0 )
{
*( inStream->_ptr ) = inChar;
inStream->_ptr += sizeof( char );
returnValue = ( int )inChar;
}
return returnValue;
}
/***
* _putwc_nolock - putwc for the miniFILE stream.
****/
int _putwc_nolock( wchar_t inChar, miniFILE* inStream )
{
int returnValue = WEOF;
inStream->_cnt -= sizeof( wchar_t );
if ( ( inStream->_cnt ) >= 0 )
{
*( ( wchar_t* )( inStream->_ptr ) ) = inChar;
inStream->_ptr += sizeof( wchar_t );
returnValue = ( int )inChar;
}
return returnValue;
}
/***
* _getc_nolock - getc for the miniFILE stream.
****/
int _getc_nolock( miniFILE* inStream )
{
int returnValue = EOF;
if ( ( inStream->_cnt ) >= ( int )( sizeof( char ) ) )
{
inStream->_cnt -= sizeof( char );
returnValue = ( int )( *( inStream->_ptr ) );
inStream->_ptr += sizeof( char );
}
return returnValue;
}
/***
* _getwc_nolock - getc for the miniFILE stream.
****/
int _getwc_nolock( miniFILE* inStream )
{
int returnValue = EOF;
if ( ( inStream->_cnt ) >= ( int )( sizeof( wchar_t ) ) )
{
inStream->_cnt -= sizeof( wchar_t );
returnValue = ( int )( *( ( wchar_t* )( inStream->_ptr ) ) );
inStream->_ptr += sizeof( wchar_t );
}
return returnValue;
}
/***
* _ungetc_nolock - ungetc for the miniFILE stream.
****/
int _ungetc_nolock( char inChar, miniFILE* inStream )
{
int returnValue = EOF;
if ( ( size_t )( ( inStream->_ptr ) - ( inStream->_base ) ) >= ( sizeof( char ) ) )
{
inStream->_cnt += sizeof( char );
inStream->_ptr -= sizeof( char );
return ( int )inChar;
}
return returnValue;
}
/***
* _ungetwc_nolock - ungetwc for the miniFILE stream.
****/
int _ungetwc_nolock( wchar_t inChar, miniFILE* inStream )
{
int returnValue = WEOF;
if ( ( size_t )( ( inStream->_ptr ) - ( inStream->_base ) ) >= ( sizeof( wchar_t ) ) )
{
inStream->_cnt += sizeof( wchar_t );
inStream->_ptr -= sizeof( wchar_t );
returnValue = ( unsigned short )inChar;
}
return returnValue;
}
/***
* _safecrt_cfltcvt - convert a float to an ascii string.
****/
/* routine used for floating-point output */
#define FORMATSIZE 30
// taken from output.inl
#define FL_ALTERNATE 0x00080 /* alternate form requested */
errno_t _safecrt_cfltcvt(double *arg, char *buffer, size_t sizeInBytes, int type, int precision, int flags)
{
char format[FORMATSIZE];
size_t formatlen = 0;
int retvalue;
if (flags & 1)
{
type -= 'a' - 'A';
}
formatlen = 0;
format[formatlen++] = '%';
if (flags & FL_ALTERNATE)
{
format[formatlen++] = '#';
}
format[formatlen++] = '.';
_itoa_s(precision, format + formatlen, FORMATSIZE - formatlen, 10);
formatlen = strlen(format);
format[formatlen++] = (char)type;
format[formatlen] = 0;
buffer[sizeInBytes - 1] = 0;
retvalue = snprintf(buffer, sizeInBytes, format, *arg);
if (buffer[sizeInBytes - 1] != 0 || retvalue <= 0)
{
buffer[0] = 0;
return EINVAL;
}
return 0;
}
/***
* _safecrt_fassign - convert a string into a float or double.
****/
void _safecrt_fassign(int flag, void* argument, char* number )
{
if ( flag != 0 ) // double
{
double dblValue = strtod(number, NULL);
*( ( double* )argument ) = dblValue;
}
else // float
{
float fltValue = strtof(number, NULL);
*( ( float* )argument ) = fltValue;
}
}
/***
* _safecrt_wfassign - convert a wchar_t string into a float or double.
****/
void _safecrt_wfassign(int flag, void* argument, wchar_t* number )
{
// We cannot use system functions for this - they
// assume that wchar_t is four bytes, while we assume
// two. So, we need to convert to a regular char string
// without using any system functions. To do this,
// we'll assume that the numbers are in the 0-9 range and
// do a simple conversion.
char* numberAsChars = ( char* )number;
int position = 0;
// do the convert
while ( number[ position ] != 0 )
{
numberAsChars[ position ] = ( char )( number[ position ] & 0x00FF );
position++;
}
numberAsChars[ position ] = ( char )( number[ position ] & 0x00FF );
// call the normal char version
_safecrt_fassign( flag, argument, numberAsChars );
}
/***
* _minimal_chartowchar - do a simple char to wchar conversion.
****/
int _minimal_chartowchar( wchar_t* outWChar, const char* inChar )
{
*outWChar = ( wchar_t )( ( unsigned short )( ( unsigned char )( *inChar ) ) );
return 1;
}
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