1 // fg_file.cxx -- File I/O routines
3 // Written by Curtis Olson, started November 1999.
5 // Copyright (C) 1999 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <Include/compiler.h>
28 #include <Debug/logstream.hxx>
30 #include "fg_file.hxx"
43 // open the file based on specified direction
44 bool FGFile::open( FGProtocol::fgProtocolDir dir ) {
45 if ( dir == FGProtocol::out ) {
46 fp = std::open( file_name.c_str(), O_WRONLY | O_CREAT | O_TRUNC,
47 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP |
49 } else if ( dir == FGProtocol::in ) {
50 fp = std::open( file_name.c_str(), O_RDONLY );
52 FG_LOG( FG_IO, FG_ALERT,
53 "Error: bidirection mode not available for files." );
58 FG_LOG( FG_IO, FG_ALERT, "Error opening file: " << file_name );
66 // read a block of data of specified size
67 int FGFile::read( char *buf, int length ) {
69 int result = std::read( fp, buf, length );
75 // read a line of data, length is max size of input buffer
76 int FGFile::readline( char *buf, int length ) {
77 // save our current position
78 int pos = lseek( fp, 0, SEEK_CUR );
81 int result = std::read( fp, buf, length );
83 // find the end of line and reset position
85 for ( i = 0; i < result && buf[i] != '\n'; ++i );
86 if ( buf[i] == '\n' ) {
91 lseek( fp, pos + result, SEEK_SET );
100 // write data to a file
101 int FGFile::write( char *buf, int length ) {
102 int result = std::write( fp, buf, length );
103 if ( result != length ) {
104 FG_LOG( FG_IO, FG_ALERT, "Error writing data: " << file_name );
112 bool FGFile::close() {
113 if ( std::close( fp ) == -1 ) {