You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
2.7 KiB
130 lines
2.7 KiB
/***
|
|
* istrgint.cpp - definitions for istream class core integer routines
|
|
*
|
|
* Copyright (c) 1991-2001, 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.
|
|
* 05-24-94 GJF Copy no more than MAXLONGSIZ characters, counting the
|
|
* '\0', into the buffer. Also, moved definition of
|
|
* MAXLONGSIZ to istream.h.
|
|
* 06-14-95 CFW Comment cleanup.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <internal.h>
|
|
#include <ctype.h>
|
|
#include <iostream.h>
|
|
#pragma hdrstop
|
|
|
|
/***
|
|
*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<MAXLONGSIZ-1; 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)
|
|
{
|
|
state |= ios::failbit;
|
|
while (i--)
|
|
{
|
|
if(bp->sputbackc(buffer[i])==EOF)
|
|
{
|
|
state |= ios::badbit;
|
|
break;
|
|
}
|
|
else
|
|
state &= ~(ios::eofbit);
|
|
}
|
|
i=0;
|
|
}
|
|
// buffer contains a valid number or '\0'
|
|
buffer[i] = '\0';
|
|
isfx();
|
|
}
|
|
if (i==MAXLONGSIZ)
|
|
{
|
|
state |= ios::failbit;
|
|
}
|
|
return base;
|
|
}
|