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DJLSR106.ARJ
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STREAMBU.CC
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C/C++ Source or Header
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1992-03-30
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5KB
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230 lines
// This is part of the iostream library, providing input/output for C++.
// Copyright (C) 1991, 1992 Per Bothner.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free
// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#define _STREAM_COMPAT
#ifdef __GNUG__
#pragma implementation "streambuf.h"
#endif
#include "ioprivate.h"
int streambuf::sputn(register const char* s, int n)
{
register int more = n;
for (;;) {
int count = _epptr - _pptr; // Space available.
if (count > 0) {
if (count > more)
count = more;
if (count > 20) {
memcpy(_pptr, s, count);
s += count;
_pptr += count;
}
else if (count <= 0)
count = 0;
else {
register char *p = _pptr;
for (register int i = count; --i >= 0; ) *p++ = *s++;
_pptr = p;
}
more -= count;
}
if (more == 0 || overflow(*s++) == EOF)
break;
more--;
}
return n - more;
}
int streambuf::sgetn(char* s, int n)
{
register int more = n;
for (;;) {
int count = _egptr - _gptr; // Data available.
if (count > 0) {
if (count > more)
count = more;
if (count > 20) {
memcpy(s, _gptr, count);
s += count;
_gptr += count;
}
else if (count <= 0)
count = 0;
else {
register char *p = _gptr;
for (register int i = count; --i >= 0; ) *s++ = *p++;
_gptr = p;
}
more -= count;
}
if (more == 0)
break;
int c = underflow();
if (c == EOF)
break;
*s++ = c;
more--;
}
return n - more;
}
int streambuf::sync()
{
if (gptr() == egptr() && pptr() == pbase())
return 0;
return EOF;
}
int streambuf::pbackfail(int c)
{
return EOF;
}
int streambuf::ungetfail()
{
if (seekoff(-1, ios::cur, ios::in) == EOF)
return EOF;
return sgetc();
}
streambuf* streambuf::setbuf(char* p, int len)
{
setb(p, p+len, 0);
setp(0, 0);
setg(0, 0, 0);
return this;
}
streampos streambuf::seekpos(streampos pos, int mode)
{
return seekoff(pos, ios::beg, mode);
}
void streambuf::setb(char* b, char* eb, int a)
{
if (_base && (_flags & _S_USER_BUF))
FREE_BUF(_base);
_base = b;
_ebuf = eb;
if (a)
_flags &= ~_S_USER_BUF;
else
_flags |= _S_USER_BUF;
}
int streambuf::doallocate()
{
char *buf = ALLOC_BUF(BUFSIZ);
if (buf == NULL)
return EOF;
setb(buf, buf+BUFSIZ, 1);
return 1;
}
streambuf::streambuf()
{
_flags = _IO_MAGIC;
_base = NULL;
_ebuf = NULL;
_eback = NULL;
_gptr = NULL;
_egptr = NULL;
_pbase = NULL;
_pptr = NULL;
_epptr = NULL;
_chain = NULL; // Not necessary.
}
streambuf::~streambuf()
{
if (_base && !(_flags & _S_USER_BUF))
FREE_BUF(_base);
}
int streambuf::underflow()
{
return EOF;
}
int streambuf::overflow(int c = EOF)
{
return EOF;
}
streampos
streambuf::seekoff(streamoff, _seek_dir, int mode /*=ios::in|ios::out*/)
{
return EOF;
}
int streambuf::sputbackc(char c)
{
if (gptr() <= eback()) return pbackfail(c);
gbump(-1);
if (*gptr() != c)
*gptr() = c;
return (unsigned char)c;
}
int streambuf::sungetc()
{
if (gptr() > eback()) {
gbump(-1);
return (unsigned char)*gptr();
}
else
return ungetfail();
}
#if 0 /* Work in progress */
void streambuf::collumn(int c)
{
if (c == -1)
_collumn = -1;
else
_collumn = c - (_pptr - _pbase);
}
#endif
int streambuf::flush_all()
{
int result = 0;
for (streambuf *sb = _list_all; sb != NULL; sb = sb->xchain())
if (sb->overflow(EOF) == EOF)
result = EOF;
return result;
}
void streambuf::flush_all_linebuffered()
{
for (streambuf *sb = _list_all; sb != NULL; sb = sb->xchain())
if (sb->linebuffered())
sb->sync();
}
#ifdef IO_CLEANUP
IO_CLEANUP
#else
struct __io_defs {
__io_defs() { }
~__io_defs() { streambuf::flush_all(); }
};
__io_defs io_defs__;
#endif