131 lines
2.6 KiB
C++
131 lines
2.6 KiB
C++
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/***
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* istrgint.cpp - definitions for istream class core integer routines
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*
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* Copyright (c) 1991-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Definitions of member function getint() for istream class.
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* [AT&T C++]
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*
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*Revision History:
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* 09-26-91 KRS Created. Split off from istream.cxx for granularity.
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* 01-06-92 KRS Remove buflen argument.
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* 05-24-94 GJF Copy no more than MAXLONGSIZ characters, counting the
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* '\0', into the buffer. Also, moved definition of
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* MAXLONGSIZ to istream.h.
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* 06-14-95 CFW Comment cleanup.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <internal.h>
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#include <ctype.h>
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#include <iostream.h>
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#pragma hdrstop
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/***
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*int istream::getint(char * buffer) - get an int
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*
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*Purpose:
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* Get an int from stream.
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*
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*Entry:
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* char * buffer = area for number to be copied.
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*
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*Exit:
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* Returns base for conversion: (0, 2, 8, or 16).
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* If successful, buffer[] contains the number, followed by \0.
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*
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*Exceptions:
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* Sets ios::failbit on error forming number.
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* Sets ios::badbit on error after failbit
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* Sets ios::eofbit if at EOF at return
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*
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*******************************************************************************/
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int istream::getint(char * buffer) // returns length
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{
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int base, i;
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int c;
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int fDigit = 0;
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int bindex = 1;
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if (x_flags & ios::dec)
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base = 10;
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else if (x_flags & ios::hex)
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base = 16;
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else if (x_flags & ios::oct)
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base = 8;
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else
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base = 0;
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if (ipfx(0))
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{
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c=bp->sgetc();
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for (i = 0; i<MAXLONGSIZ-1; buffer[i] = (char)c,c=bp->snextc(),i++)
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{
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if (c==EOF)
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{
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state |= ios::eofbit;
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break;
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}
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if (!i)
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{
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if ((c=='-') || (c=='+'))
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{
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bindex++;
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continue;
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}
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}
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if ((i==bindex) && (buffer[i-1]=='0'))
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{
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if (((c=='x') || (c=='X')) && ((base==0) || (base==16)))
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{
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base = 16; // simplifies matters
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fDigit = 0;
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continue;
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}
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else if (base==0)
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{
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base = 8;
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}
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}
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// now simply look for a digit and set fDigit if found else break
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if (base==16)
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{
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if (!isxdigit(c))
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break;
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}
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else if ((!isdigit(c)) || ((base==8) && (c>'7')))
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break;
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fDigit++;
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}
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if (!fDigit)
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{
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state |= ios::failbit;
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while (i--)
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{
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if(bp->sputbackc(buffer[i])==EOF)
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{
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state |= ios::badbit;
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break;
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}
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else
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state &= ~(ios::eofbit);
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}
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i=0;
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}
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// buffer contains a valid number or '\0'
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buffer[i] = '\0';
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isfx();
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}
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if (i==MAXLONGSIZ)
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{
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state |= ios::failbit;
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}
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return base;
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}
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