99 lines
2 KiB
C++
99 lines
2 KiB
C++
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/***
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* istream1.cpp - non-core definitions for istream & istream_withassign classes
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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 non-core member functions for istream and
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* istream_withassign classes.
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* [AT&T C++]
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*
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*Revision History:
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* 09-23-91 KRS Created. Split off from istream.cxx for granularity.
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* 10-07-91 KRS Increment x_gcount in get(sb).
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* 10-24-91 KRS Fix istream_withassign::operator=() functions.
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* 11-20-91 KRS Make operator= inline.
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* 03-30-92 KRS Add multithread locking.
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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 <stdlib.h>
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#include <iostream.h>
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#pragma hdrstop
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istream& istream::operator>>(streambuf* _sbuf)
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{
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int c;
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if (ipfx(0))
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{
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while ((c=bp->sbumpc())!=EOF)
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{
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if (_sbuf->sputc(c)==EOF)
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{
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state |= ios::failbit;
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}
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}
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isfx();
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}
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return *this;
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}
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// unformatted input functions
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istream& istream::get( streambuf& sbuf, char delim)
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{
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int c;
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if (ipfx(1)) // resets x_gcount
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{
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while ((c = bp->sgetc())!=delim)
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{
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if (c==EOF) // stop if EOF encountered
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{
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state |= ios::eofbit;
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break;
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}
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bp->stossc(); // advance get pointer
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x_gcount++; // and increment count
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if (sbuf.sputc(c)==EOF)
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state |= ios::failbit;
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}
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isfx();
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}
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return *this;
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}
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istream& istream::seekg(streampos _strmp)
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{
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lockbuf();
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if (bp->seekpos(_strmp, ios::in)==EOF)
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{
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clear(state | failbit);
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}
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unlockbuf();
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return(*this);
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}
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istream& istream::seekg(streamoff _strmf, seek_dir _sd)
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{
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lockbuf();
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if (bp->seekoff(_strmf, _sd, ios::in)==EOF)
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clear(state | failbit);
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unlockbuf();
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return(*this);
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}
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streampos istream::tellg()
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{
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streampos retval;
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lockbuf();
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if ((retval=bp->seekoff(streamoff(0), ios::cur, ios::in))==EOF)
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clear(state | failbit);
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unlockbuf();
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return(retval);
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}
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