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Diffstat (limited to 'private/crt32/iostream/ifstream.cxx')
| -rw-r--r-- | private/crt32/iostream/ifstream.cxx | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/private/crt32/iostream/ifstream.cxx b/private/crt32/iostream/ifstream.cxx new file mode 100644 index 000000000..e49e26d40 --- /dev/null +++ b/private/crt32/iostream/ifstream.cxx @@ -0,0 +1,240 @@ +/*** +*ifstream.cxx - ifstream member function definitions +* +* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved. +* +*Purpose: +* Contains the member functions for the ifstream class. +* +*Revision History: +* 09-21-91 KRS Created. Split up fstream.cxx for granularity. +* 10-22-91 KRS C700 #4883: fix error status for ifstream::open(). +* +*******************************************************************************/ + +#include <cruntime.h> +#include <internal.h> +#include <string.h> +#include <stdio.h> +#include <fcntl.h> +#include <sys\types.h> +#include <io.h> +#include <fstream.h> +#pragma hdrstop + +#include <sys\stat.h> + +/*** +*ifstream::ifstream() - ifstream default constructor +* +*Purpose: +* Default constructor for ifstream objects. +* +*Entry: +* None. +* +*Exit: +* None. +* +*Exceptions: +* +*******************************************************************************/ + ifstream::ifstream() +: istream(new filebuf) +{ + delbuf(1); // schedule automatic deletion too... + // CONSIDER: do anything else? +} + +/*** +*ifstream::ifstream(const char * name, int mode, int prot) - ifstream ctor +* +*Purpose: +* Constructor for ifstream objects. Creates an associated filebuf object, +* opens a named file and attaches it to the new filebuf. +* +*Entry: +* name = filename to open. +* mode = see filebuf::open mode argument. ios::in is implied. +* prot = see filebuf::open share argument +* +*Exit: +* None. +* +*Exceptions: +* Sets failbit if open fails. +* +*******************************************************************************/ + ifstream::ifstream(const char * name, int mode, int prot) +: istream(new filebuf) +{ + delbuf(1); // schedule automatic deletion too... + if (!(rdbuf()->open(name, (mode|ios::in), prot))) + state |= ios::failbit; +} + +/*** +*ifstream::ifstream(filedesc fd) - ifstream constructor +* +*Purpose: +* Constructor for ifstream objects. Creates an associated filebuf object +* and attaches it to the given file descriptor. +* +*Entry: +* fd = file descriptor of file previously opened using _open or _sopen. +* +*Exit: +* None. +* +*Exceptions: +* +*******************************************************************************/ + ifstream::ifstream(filedesc _fd) +: istream(new filebuf(_fd)) +{ + delbuf(1); +} + +/*** +*ifstream::ifstream(filedesc fd, char * sbuf, int len) - ifstream constructor +* +*Purpose: +* Constructor for ifstream objects. Creates an associated filebuf object +* and attaches it to the given file descriptor. Filebuf object uses +* user-supplied buffer or is unbuffered if sbuf or len = 0. +* +*Entry: +* fd = file descriptor of file previously opened using _open or _sopen. +* sbuf = pointer to character buffer or NULL if request for unbuffered. +* len = lenght of character buffer sbuf or 0 if request for unbuffered. +* +*Exit: +* None. +* +*Exceptions: +* +*******************************************************************************/ + ifstream::ifstream(filedesc _fd, char * sbuf, int len) +: istream(new filebuf(_fd, sbuf, len)) +//: istream(new filebuf); +{ + delbuf(1); +} + +/*** +*ifstream::~ifstream() - ifstream destructor +* +*Purpose: +* ifstream destructor. +* +*Entry: +* None. +* +*Exit: +* None. +* +*Exceptions: +* +*******************************************************************************/ + ifstream::~ifstream() +{ + // CONSIDER: do anything else? +} + +/*** +*streambuf* ifstream::setbuf(char * ptr, int len) - setbuf function +* +*Purpose: +* ifstream setbuf function +* +*Entry: +* ptr = pointer to buffer or NULL for unbuffered. +* len = length of buffer or zero for unbuffered. +* +*Exit: +* Returns rdbuf() or NULL if error. +* +*Exceptions: +* If ifstream is already open or if rdbuf()->setbuf fails, sets failbit +* and returns NULL. +* +*******************************************************************************/ +streambuf * ifstream::setbuf(char * ptr, int len) +{ + if ((is_open()) || (!(rdbuf()->setbuf(ptr, len)))) + { + clear(state | ios::failbit); + return NULL; + } + // UNDONE: turn off output buffer?? + return rdbuf(); +} + +/*** +*void ifstream::attach(filedesc _fd) - attach member function +* +*Purpose: +* ifstream attach member function. Just calls rdbuf()->attach(). +* +*Entry: +* _fd = file descriptor of previously opened file. +* +*Exit: +* None. +* +*Exceptions: +* Sets failbit if rdbuf()->attach fails. +* +*******************************************************************************/ +void ifstream::attach(filedesc _fd) // CONSIDER: inline? +{ + if (!(rdbuf()->attach(_fd))) + clear(state | ios::failbit); +} + +/*** +*void ifstream::open(const char * name, int mode, int prot) - ifstream open() +* +*Purpose: +* Opens a named file and attaches it to the associated filebuf. +* Just calls rdbuf()->open(). +* +*Entry: +* name = filename to open. +* mode = see filebuf::open mode argument. ios::in is implied. +* prot = see filebuf::open share argument +* +*Exit: +* None. +* +*Exceptions: +* Sets failbit if already open or rdbuf()->open() fails. +* +*******************************************************************************/ +void ifstream::open(const char * name, int mode, int prot) +{ + if (is_open() || !(rdbuf()->open(name, (mode|ios::in), prot))) + clear(state | ios::failbit); +} + +/*** +*void ifstream::close() - close member function +* +*Purpose: +* ifstream close member function. Just calls rdbuf()->close(). +* Clears rdstate() error bits if successful. +* +*Entry: +* None. +* +*Exit: +* None. +* +*Exceptions: +* Sets failbit if rdbuf()->close fails. +* +*******************************************************************************/ +void ifstream::close() +{ + clear((rdbuf()->close()) ? 0 : (state | ios::failbit)); +} |