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OS/2 Shareware BBS: 10 Tools
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stlpt453.zip
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STLport-4.5.3
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src
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stdio_streambuf.cpp
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2002-01-10
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/*
* Copyright (c) 1999
* Silicon Graphics Computer Systems, Inc.
*
* Copyright (c) 1999
* Boris Fomitchev
*
* This material is provided "as is", with absolutely no warranty expressed
* or implied. Any use is at your own risk.
*
* Permission to use or copy this software for any purpose is hereby granted
* without fee, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*
*/
# include "stlport_prefix.h"
#include <stdio_streambuf>
#ifdef _STLP_UNIX
#include <sys/types.h>
#include <sys/stat.h>
#endif /* __unix */
#include <stl/_fstream.h>
#include "fstream_impl.h"
# if defined (_STLP_USE_WIN32_IO) && !defined(_STLP_WINCE)
# if defined (__BORLANDC__)
// # include <cio.h>
# include <cfcntl.h>
# else
# include <io.h>
# include <fcntl.h>
# endif
# include <sys/stat.h>
# endif
__SGI_BEGIN_NAMESPACE
//----------------------------------------------------------------------
// Class stdio_streambuf_base
stdio_streambuf_base::stdio_streambuf_base(FILE* file)
: _STLP_STD::basic_streambuf<char, _STLP_STD::char_traits<char> >(file, 0),
_M_file(file)
{}
stdio_streambuf_base::~stdio_streambuf_base()
{
_STLP_VENDOR_CSTD::fflush(_M_file);
}
_STLP_STD::streambuf* stdio_streambuf_base::setbuf(char* s, streamsize n)
{
_STLP_VENDOR_CSTD::setvbuf(_M_file, s, (s == 0 && n == 0) ? _IONBF : _IOFBF, n);
return this;
}
stdio_streambuf_base::pos_type
stdio_streambuf_base::seekoff(off_type off, ios_base::seekdir dir,
ios_base::openmode /* mode */)
{
int whence;
switch(dir) {
case ios_base::beg:
whence = SEEK_SET;
break;
case ios_base::cur:
whence = SEEK_CUR;
break;
case ios_base::end:
whence = SEEK_END;
break;
default:
return pos_type(-1);
}
if (_STLP_VENDOR_CSTD::fseek(_M_file, off, whence) == 0) {
fpos_t pos;
_STLP_VENDOR_CSTD::fgetpos(_M_file, &pos);
// added 21 june 00 mdb,rjf,wjs: glibc 2.2 changed fpos_t to be a struct instead
// of a primitive type
#if (defined(__GLIBC__) && ( (__GLIBC__ > 2) || ( (__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 2) ) ) )
return pos_type((streamoff)pos.__pos);
#elif defined(__ISCPP__) || defined(__MVS__) || (__OS400__)
return pos_type(pos.__fpos_elem[ 0 ]);
#else
return pos_type(pos);
#endif
}
else
return pos_type(-1);
}
stdio_streambuf_base::pos_type
stdio_streambuf_base::seekpos(pos_type pos, ios_base::openmode /* mode */) // dwa 4/27/00 - suppress unused parameter warning
{
// added 21 june 00 mdb,rjf,wjs: glibc 2.2 changed fpos_t to be a struct instead
// of a primitive type
#if (defined(__GLIBC__) && ( (__GLIBC__ > 2) || ( (__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 2) ) ) )
fpos_t p;
p.__pos = pos;
memset( &(p.__state), 0, sizeof(p.__state) );
#elif defined(__MVS__) || (__OS400__)
fpos_t p;
p.__fpos_elem[0] = pos;
#else
fpos_t p(pos);
#endif
if (_STLP_VENDOR_CSTD::fsetpos(_M_file, &p) == 0)
return pos;
else
return pos_type(-1);
}
int stdio_streambuf_base::sync()
{
return _STLP_VENDOR_CSTD::fflush(_M_file) == 0 ? 0 : -1;
}
//----------------------------------------------------------------------
// Class stdio_istreambuf
stdio_istreambuf::~stdio_istreambuf() {}
streamsize stdio_istreambuf::showmanyc()
{
if (feof(_M_file))
return -1;
else {
int fd = _FILE_fd(_M_file);
# ifdef _STLP_USE_WIN32_IO
// in this case, __file_size works with Win32 fh , not libc one
streamoff size;
struct stat buf;
# ifdef __BORLANDC__
if(fstat(fd, &buf) == 0 && S_ISREG( buf.st_mode ) )
# else
if(fstat(fd, &buf) == 0 && ( _S_IFREG & buf.st_mode ) )
# endif
size = ( buf.st_size > 0 ? buf.st_size : 0);
else
size = 0;
# else
streamoff size = _SgI::__file_size(fd);
# endif
// fbp : we can use ftell as this flavour always use stdio.
long pos = _STLP_VENDOR_CSTD::ftell(_M_file);
return pos >= 0 && size > pos ? size - pos : 0;
}
}
stdio_istreambuf::int_type stdio_istreambuf::underflow()
{
int c = getc(_M_file);
if (c != EOF) {
_STLP_VENDOR_CSTD::ungetc(c, _M_file);
return c;
}
else
return traits_type::eof();
}
stdio_istreambuf::int_type stdio_istreambuf::uflow()
{
int c = getc(_M_file);
return c != EOF ? c : traits_type::eof();
}
stdio_istreambuf::int_type stdio_istreambuf::pbackfail(int_type c)
{
if (c != traits_type::eof()) {
int result = _STLP_VENDOR_CSTD::ungetc(c, _M_file);
return result != EOF ? result : traits_type::eof();
}
else{
if (this->eback() < this->gptr()) {
this->gbump(-1);
return traits_type::not_eof(c);
}
else
return traits_type::eof();
}
}
//----------------------------------------------------------------------
// Class stdio_ostreambuf
stdio_ostreambuf::~stdio_ostreambuf() {}
streamsize stdio_ostreambuf::showmanyc()
{
return -1;
}
stdio_ostreambuf::int_type stdio_ostreambuf::overflow(int_type c)
{
// Write the existing buffer, without writing any additional character.
if (c == traits_type::eof()) {
// Do we have a buffer to write?
ptrdiff_t unwritten = this->pptr() - this->pbase();
if (unwritten != 0) {
_STLP_VENDOR_CSTD::fflush(_M_file);
// Test if the write succeeded.
if (this->pptr() - this->pbase() < unwritten)
return traits_type::not_eof(c);
else
return traits_type::eof();
}
// We always succeed if we don't have to do anything.
else
return traits_type::not_eof(c);
}
// Write the character c, and whatever else might be in the buffer.
else {
int result = putc(c, _M_file);
return result != EOF ? result : traits_type::eof();
}
}
__SGI_END_NAMESPACE
// Local Variables:
// mode:C++
// End: