in.c
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/*ident "@(#)cls4:lib/stream/in.c 1.3" */
/*******************************************************************************
C++ source for the C++ Language System, Release 3.0. This product
is a new release of the original cfront developed in the computer
science research center of AT&T Bell Laboratories.
Copyright (c) 1993 UNIX System Laboratories, Inc.
Copyright (c) 1991, 1992 AT&T and UNIX System Laboratories, Inc.
Copyright (c) 1984, 1989, 1990 AT&T. All Rights Reserved.
THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE of AT&T and UNIX System
Laboratories, Inc. The copyright notice above does not evidence
any actual or intended publication of such source code.
*******************************************************************************/
#include <ctype.h>
#include <iostream.h>
#define ISTREAM istream
void ISTREAM::eatwhite ()
{
register streambuf *nbp = bp;
register int c = nbp->sgetc();
while (isspace(c)) c = nbp->snextc();
if (c == EOF) setstate(eofbit);
}
void ISTREAM::xget(char* c)
{
register streambuf* sbp = bp ;
if ( !ipfx(1) ) return ;
x_gcount = 0 ;
register int newc = sbp->sbumpc() ;
if ( newc == EOF ) {
setstate(failbit|eofbit) ;
return ;
}
x_gcount = 1 ;
*c = newc ;
}
istream& ISTREAM::operator>>(register char* s)
{
/* get string */
register int w = width(0) ;
if ( flags()&skipws ) {
// We don't know a maximum number of required
// characters
if ( !ipfx(0) ) return *this ;
}
else if ( !ipfx(w) ) {
return *this ;
}
register streambuf *nbp = bp;
register int c = nbp->sgetc();
if (c == EOF) setstate(failbit|eofbit) ;
if ( w > 0 ) {
while (!isspace(c) && c != EOF && --w > 0 ) {
*s++ = c;
c = nbp->snextc();
}
} else {
while (!isspace(c) && c != EOF ) {
*s++ = c;
c = nbp->snextc();
}
}
*s = '\0';
if (c == EOF) setstate(eofbit) ;
return *this;
}
istream& ISTREAM::operator>>(unsigned char* s)
{
return *this >> (char*)s ;
}
istream& ISTREAM::putback(register char c)
{
if ( !good() ) return *this ;
if ( bp->sputbackc(c) == EOF ) setstate(badbit) ;
return *this;
}
istream& ISTREAM::rs_complicated(unsigned char& c)
{ if ( ipfx(0) ) {
if ( bp->in_avail() ) {
c = bp->sbumpc() ;
} else xget((char*)&c) ;
}
return *this ;
}
istream& ISTREAM::rs_complicated(char& c)
{ if ( ipfx(0) ) {
if ( bp->in_avail() ) {
c = bp->sbumpc() ;
} else xget((char*)&c) ;
}
return *this ;
}
istream& ISTREAM::get_complicated(unsigned char& c)
{
if ( ipfx(1) && bp->in_avail()) {
x_gcount = 1 ;
c = bp->sbumpc() ;
} else {
xget((char*)&c) ;
}
return *this ;
}
istream& ISTREAM::get_complicated(char& c)
{
if ( ipfx(1) && bp->in_avail()) {
x_gcount = 1 ;
c = bp->sbumpc() ;
} else {
xget(&c) ;
}
return *this ;
}
/* int ISTREAM::get_complicated()
{
int c ;
if ( !ipfx(1) ) return EOF ;
else {
c = bp->sbumpc() ;
if ( c == EOF ) setstate(eofbit) ;
return c ;
}
}
*/