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/***
* istrgint.cxx - definitions for istream class core integer routines
*
* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Definitions of member function getint() for istream class.
* [AT&T C++]
*
*Revision History:
* 09-26-91 KRS Created. Split off from istream.cxx for granularity.
* 01-06-92 KRS Remove buflen argument.
*
*******************************************************************************/
#include <cruntime.h>
#include <internal.h>
#include <ctype.h>
#include <iostream.h>
#pragma hdrstop
#define MAXLONGSIZE 16
/***
*int istream::getint(char * buffer) - get an int
*
*Purpose:
* Get an int from stream.
*
*Entry:
* char * buffer = area for number to be copied.
*
*Exit:
* Returns base for conversion: (0, 2, 8, or 16).
* If successful, buffer[] contains the number, followed by \0.
*
*Exceptions:
* Sets ios::failbit on error forming number.
* Sets ios::badbit on error after failbit
* Sets ios::eofbit if at EOF at return
*
*******************************************************************************/
int istream::getint(char * buffer) // returns length
{
int base, i;
int c;
int fDigit = 0;
int bindex = 1;
if (x_flags & ios::dec)
base = 10;
else if (x_flags & ios::hex)
base = 16;
else if (x_flags & ios::oct)
base = 8;
else
base = 0;
if (ipfx(0))
{
c=bp->sgetc();
for (i = 0; i<MAXLONGSIZE; buffer[i] = (char)c,c=bp->snextc(),i++)
{
if (c==EOF)
{
state |= ios::eofbit;
break;
}
if (!i)
{
if ((c=='-') || (c=='+'))
{
bindex++;
continue;
}
}
if ((i==bindex) && (buffer[i-1]=='0'))
{
if (((c=='x') || (c=='X')) && ((base==0) || (base==16)))
{
base = 16; // simplifies matters
fDigit = 0;
continue;
}
else if (base==0)
{
base = 8;
}
}
// now simply look for a digit and set fDigit if found else break
if (base==16)
{
if (!isxdigit(c))
break;
}
else if ((!isdigit(c)) || ((base==8) && (c>'7')))
break;
fDigit++;
}
if (!fDigit)
{
#if 0
if ((i==bindex+1) && ((buffer[bindex]=='x') || (buffer[bindex]=='X')))
{
// found 0x but no number, so back up one and return '0'
if (bp->sputbackc(buffer[bindex])!=EOF)
{
i--;
state &= ~(ios::eofbit);
// fDigit++;
}
else
state |= (ios::failbit|ios::badbit); // CONSIDER: correct?
}
else
#endif
{
state |= ios::failbit;
while (i--)
{
if(bp->sputbackc(buffer[i])==EOF)
{
state |= ios::badbit; // CONSIDER: correct?
break;
}
else
state &= ~(ios::eofbit);
}
i=0;
}
}
// buffer contains a valid number or '\0'
buffer[i] = '\0';
isfx();
}
if (i==MAXLONGSIZE)
{
state |= ios::failbit;
}
return base;
}
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